diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/encoder/vp9_firstpass.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/encoder/vp9_firstpass.c | 3906 |
1 files changed, 3906 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/encoder/vp9_firstpass.c b/media/libvpx/libvpx/vp9/encoder/vp9_firstpass.c new file mode 100644 index 0000000000..a9cdf5353f --- /dev/null +++ b/media/libvpx/libvpx/vp9/encoder/vp9_firstpass.c @@ -0,0 +1,3906 @@ +/* + * Copyright (c) 2010 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include <limits.h> +#include <math.h> +#include <stdio.h> + +#include "./vpx_dsp_rtcd.h" +#include "./vpx_scale_rtcd.h" + +#include "vpx_dsp/vpx_dsp_common.h" +#include "vpx_mem/vpx_mem.h" +#include "vpx_ports/mem.h" +#include "vpx_ports/system_state.h" +#include "vpx_scale/vpx_scale.h" +#include "vpx_scale/yv12config.h" + +#include "vp9/common/vp9_entropymv.h" +#include "vp9/common/vp9_quant_common.h" +#include "vp9/common/vp9_reconinter.h" // vp9_setup_dst_planes() +#include "vp9/encoder/vp9_aq_variance.h" +#include "vp9/encoder/vp9_block.h" +#include "vp9/encoder/vp9_encodeframe.h" +#include "vp9/encoder/vp9_encodemb.h" +#include "vp9/encoder/vp9_encodemv.h" +#include "vp9/encoder/vp9_encoder.h" +#include "vp9/encoder/vp9_ethread.h" +#include "vp9/encoder/vp9_extend.h" +#include "vp9/encoder/vp9_firstpass.h" +#include "vp9/encoder/vp9_mcomp.h" +#include "vp9/encoder/vp9_quantize.h" +#include "vp9/encoder/vp9_rd.h" +#include "vpx_dsp/variance.h" + +#define OUTPUT_FPF 0 +#define ARF_STATS_OUTPUT 0 +#define COMPLEXITY_STATS_OUTPUT 0 + +#define FIRST_PASS_Q 10.0 +#define NORMAL_BOOST 100 +#define MIN_ARF_GF_BOOST 250 +#define MIN_DECAY_FACTOR 0.01 +#define NEW_MV_MODE_PENALTY 32 +#define DARK_THRESH 64 +#define LOW_I_THRESH 24000 + +#define NCOUNT_INTRA_THRESH 8192 +#define NCOUNT_INTRA_FACTOR 3 + +#define INTRA_PART 0.005 +#define DEFAULT_DECAY_LIMIT 0.75 +#define LOW_SR_DIFF_TRHESH 0.1 +#define LOW_CODED_ERR_PER_MB 10.0 +#define NCOUNT_FRAME_II_THRESH 6.0 +#define BASELINE_ERR_PER_MB 12500.0 +#define GF_MAX_FRAME_BOOST 96.0 + +#ifdef AGGRESSIVE_VBR +#define KF_MIN_FRAME_BOOST 40.0 +#define KF_MAX_FRAME_BOOST 80.0 +#define MAX_KF_TOT_BOOST 4800 +#else +#define KF_MIN_FRAME_BOOST 40.0 +#define KF_MAX_FRAME_BOOST 96.0 +#define MAX_KF_TOT_BOOST 5400 +#endif + +#define DEFAULT_ZM_FACTOR 0.5 +#define MINQ_ADJ_LIMIT 48 +#define MINQ_ADJ_LIMIT_CQ 20 +#define HIGH_UNDERSHOOT_RATIO 2 +#define AV_WQ_FACTOR 4.0 + +#define DOUBLE_DIVIDE_CHECK(x) ((x) < 0 ? (x)-0.000001 : (x) + 0.000001) + +#if ARF_STATS_OUTPUT +unsigned int arf_count = 0; +#endif + +// Resets the first pass file to the given position using a relative seek from +// the current position. +static void reset_fpf_position(TWO_PASS *p, const FIRSTPASS_STATS *position) { + p->stats_in = position; +} + +// Read frame stats at an offset from the current position. +static const FIRSTPASS_STATS *read_frame_stats(const TWO_PASS *p, int offset) { + if ((offset >= 0 && p->stats_in + offset >= p->stats_in_end) || + (offset < 0 && p->stats_in + offset < p->stats_in_start)) { + return NULL; + } + + return &p->stats_in[offset]; +} + +static int input_stats(TWO_PASS *p, FIRSTPASS_STATS *fps) { + if (p->stats_in >= p->stats_in_end) return EOF; + + *fps = *p->stats_in; + ++p->stats_in; + return 1; +} + +static void output_stats(FIRSTPASS_STATS *stats) { + (void)stats; +// TEMP debug code +#if OUTPUT_FPF + { + FILE *fpfile; + fpfile = fopen("firstpass.stt", "a"); + + fprintf(fpfile, + "%12.0lf %12.4lf %12.2lf %12.2lf %12.2lf %12.0lf %12.4lf %12.4lf" + "%12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf" + "%12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.0lf %12.4lf %12.0lf" + "%12.4lf" + "\n", + stats->frame, stats->weight, stats->intra_error, stats->coded_error, + stats->sr_coded_error, stats->frame_noise_energy, stats->pcnt_inter, + stats->pcnt_motion, stats->pcnt_second_ref, stats->pcnt_neutral, + stats->pcnt_intra_low, stats->pcnt_intra_high, + stats->intra_skip_pct, stats->intra_smooth_pct, + stats->inactive_zone_rows, stats->inactive_zone_cols, stats->MVr, + stats->mvr_abs, stats->MVc, stats->mvc_abs, stats->MVrv, + stats->MVcv, stats->mv_in_out_count, stats->count, stats->duration); + fclose(fpfile); + } +#endif +} + +static void zero_stats(FIRSTPASS_STATS *section) { + section->frame = 0.0; + section->weight = 0.0; + section->intra_error = 0.0; + section->coded_error = 0.0; + section->sr_coded_error = 0.0; + section->frame_noise_energy = 0.0; + section->pcnt_inter = 0.0; + section->pcnt_motion = 0.0; + section->pcnt_second_ref = 0.0; + section->pcnt_neutral = 0.0; + section->intra_skip_pct = 0.0; + section->intra_smooth_pct = 0.0; + section->pcnt_intra_low = 0.0; + section->pcnt_intra_high = 0.0; + section->inactive_zone_rows = 0.0; + section->inactive_zone_cols = 0.0; + section->new_mv_count = 0.0; + section->MVr = 0.0; + section->mvr_abs = 0.0; + section->MVc = 0.0; + section->mvc_abs = 0.0; + section->MVrv = 0.0; + section->MVcv = 0.0; + section->mv_in_out_count = 0.0; + section->count = 0.0; + section->duration = 1.0; + section->spatial_layer_id = 0; +} + +static void accumulate_stats(FIRSTPASS_STATS *section, + const FIRSTPASS_STATS *frame) { + section->frame += frame->frame; + section->weight += frame->weight; + section->spatial_layer_id = frame->spatial_layer_id; + section->intra_error += frame->intra_error; + section->coded_error += frame->coded_error; + section->sr_coded_error += frame->sr_coded_error; + section->frame_noise_energy += frame->frame_noise_energy; + section->pcnt_inter += frame->pcnt_inter; + section->pcnt_motion += frame->pcnt_motion; + section->pcnt_second_ref += frame->pcnt_second_ref; + section->pcnt_neutral += frame->pcnt_neutral; + section->intra_skip_pct += frame->intra_skip_pct; + section->intra_smooth_pct += frame->intra_smooth_pct; + section->pcnt_intra_low += frame->pcnt_intra_low; + section->pcnt_intra_high += frame->pcnt_intra_high; + section->inactive_zone_rows += frame->inactive_zone_rows; + section->inactive_zone_cols += frame->inactive_zone_cols; + section->new_mv_count += frame->new_mv_count; + section->MVr += frame->MVr; + section->mvr_abs += frame->mvr_abs; + section->MVc += frame->MVc; + section->mvc_abs += frame->mvc_abs; + section->MVrv += frame->MVrv; + section->MVcv += frame->MVcv; + section->mv_in_out_count += frame->mv_in_out_count; + section->count += frame->count; + section->duration += frame->duration; +} + +static void subtract_stats(FIRSTPASS_STATS *section, + const FIRSTPASS_STATS *frame) { + section->frame -= frame->frame; + section->weight -= frame->weight; + section->intra_error -= frame->intra_error; + section->coded_error -= frame->coded_error; + section->sr_coded_error -= frame->sr_coded_error; + section->frame_noise_energy -= frame->frame_noise_energy; + section->pcnt_inter -= frame->pcnt_inter; + section->pcnt_motion -= frame->pcnt_motion; + section->pcnt_second_ref -= frame->pcnt_second_ref; + section->pcnt_neutral -= frame->pcnt_neutral; + section->intra_skip_pct -= frame->intra_skip_pct; + section->intra_smooth_pct -= frame->intra_smooth_pct; + section->pcnt_intra_low -= frame->pcnt_intra_low; + section->pcnt_intra_high -= frame->pcnt_intra_high; + section->inactive_zone_rows -= frame->inactive_zone_rows; + section->inactive_zone_cols -= frame->inactive_zone_cols; + section->new_mv_count -= frame->new_mv_count; + section->MVr -= frame->MVr; + section->mvr_abs -= frame->mvr_abs; + section->MVc -= frame->MVc; + section->mvc_abs -= frame->mvc_abs; + section->MVrv -= frame->MVrv; + section->MVcv -= frame->MVcv; + section->mv_in_out_count -= frame->mv_in_out_count; + section->count -= frame->count; + section->duration -= frame->duration; +} + +// Calculate an active area of the image that discounts formatting +// bars and partially discounts other 0 energy areas. +#define MIN_ACTIVE_AREA 0.5 +#define MAX_ACTIVE_AREA 1.0 +static double calculate_active_area(const FRAME_INFO *frame_info, + const FIRSTPASS_STATS *this_frame) { + double active_pct; + + active_pct = + 1.0 - + ((this_frame->intra_skip_pct / 2) + + ((this_frame->inactive_zone_rows * 2) / (double)frame_info->mb_rows)); + return fclamp(active_pct, MIN_ACTIVE_AREA, MAX_ACTIVE_AREA); +} + +// Get the average weighted error for the clip (or corpus) +static double get_distribution_av_err(VP9_COMP *cpi, TWO_PASS *const twopass) { + const double av_weight = + twopass->total_stats.weight / twopass->total_stats.count; + + if (cpi->oxcf.vbr_corpus_complexity) + return av_weight * twopass->mean_mod_score; + else + return (twopass->total_stats.coded_error * av_weight) / + twopass->total_stats.count; +} + +#define ACT_AREA_CORRECTION 0.5 +// Calculate a modified Error used in distributing bits between easier and +// harder frames. +static double calculate_mod_frame_score(const VP9_COMP *cpi, + const VP9EncoderConfig *oxcf, + const FIRSTPASS_STATS *this_frame, + const double av_err) { + double modified_score = + av_err * pow(this_frame->coded_error * this_frame->weight / + DOUBLE_DIVIDE_CHECK(av_err), + oxcf->two_pass_vbrbias / 100.0); + + // Correction for active area. Frames with a reduced active area + // (eg due to formatting bars) have a higher error per mb for the + // remaining active MBs. The correction here assumes that coding + // 0.5N blocks of complexity 2X is a little easier than coding N + // blocks of complexity X. + modified_score *= pow(calculate_active_area(&cpi->frame_info, this_frame), + ACT_AREA_CORRECTION); + + return modified_score; +} + +static double calc_norm_frame_score(const VP9EncoderConfig *oxcf, + const FRAME_INFO *frame_info, + const FIRSTPASS_STATS *this_frame, + double mean_mod_score, double av_err) { + double modified_score = + av_err * pow(this_frame->coded_error * this_frame->weight / + DOUBLE_DIVIDE_CHECK(av_err), + oxcf->two_pass_vbrbias / 100.0); + + const double min_score = (double)(oxcf->two_pass_vbrmin_section) / 100.0; + const double max_score = (double)(oxcf->two_pass_vbrmax_section) / 100.0; + + // Correction for active area. Frames with a reduced active area + // (eg due to formatting bars) have a higher error per mb for the + // remaining active MBs. The correction here assumes that coding + // 0.5N blocks of complexity 2X is a little easier than coding N + // blocks of complexity X. + modified_score *= + pow(calculate_active_area(frame_info, this_frame), ACT_AREA_CORRECTION); + + // Normalize to a midpoint score. + modified_score /= DOUBLE_DIVIDE_CHECK(mean_mod_score); + return fclamp(modified_score, min_score, max_score); +} + +static double calculate_norm_frame_score(const VP9_COMP *cpi, + const TWO_PASS *twopass, + const VP9EncoderConfig *oxcf, + const FIRSTPASS_STATS *this_frame, + const double av_err) { + return calc_norm_frame_score(oxcf, &cpi->frame_info, this_frame, + twopass->mean_mod_score, av_err); +} + +// This function returns the maximum target rate per frame. +static int frame_max_bits(const RATE_CONTROL *rc, + const VP9EncoderConfig *oxcf) { + int64_t max_bits = ((int64_t)rc->avg_frame_bandwidth * + (int64_t)oxcf->two_pass_vbrmax_section) / + 100; + if (max_bits < 0) + max_bits = 0; + else if (max_bits > rc->max_frame_bandwidth) + max_bits = rc->max_frame_bandwidth; + + return (int)max_bits; +} + +void vp9_init_first_pass(VP9_COMP *cpi) { + zero_stats(&cpi->twopass.total_stats); +} + +void vp9_end_first_pass(VP9_COMP *cpi) { + output_stats(&cpi->twopass.total_stats); + cpi->twopass.first_pass_done = 1; + vpx_free(cpi->twopass.fp_mb_float_stats); + cpi->twopass.fp_mb_float_stats = NULL; +} + +static vpx_variance_fn_t get_block_variance_fn(BLOCK_SIZE bsize) { + switch (bsize) { + case BLOCK_8X8: return vpx_mse8x8; + case BLOCK_16X8: return vpx_mse16x8; + case BLOCK_8X16: return vpx_mse8x16; + default: return vpx_mse16x16; + } +} + +static unsigned int get_prediction_error(BLOCK_SIZE bsize, + const struct buf_2d *src, + const struct buf_2d *ref) { + unsigned int sse; + const vpx_variance_fn_t fn = get_block_variance_fn(bsize); + fn(src->buf, src->stride, ref->buf, ref->stride, &sse); + return sse; +} + +#if CONFIG_VP9_HIGHBITDEPTH +static vpx_variance_fn_t highbd_get_block_variance_fn(BLOCK_SIZE bsize, + int bd) { + switch (bd) { + default: + switch (bsize) { + case BLOCK_8X8: return vpx_highbd_8_mse8x8; + case BLOCK_16X8: return vpx_highbd_8_mse16x8; + case BLOCK_8X16: return vpx_highbd_8_mse8x16; + default: return vpx_highbd_8_mse16x16; + } + case 10: + switch (bsize) { + case BLOCK_8X8: return vpx_highbd_10_mse8x8; + case BLOCK_16X8: return vpx_highbd_10_mse16x8; + case BLOCK_8X16: return vpx_highbd_10_mse8x16; + default: return vpx_highbd_10_mse16x16; + } + case 12: + switch (bsize) { + case BLOCK_8X8: return vpx_highbd_12_mse8x8; + case BLOCK_16X8: return vpx_highbd_12_mse16x8; + case BLOCK_8X16: return vpx_highbd_12_mse8x16; + default: return vpx_highbd_12_mse16x16; + } + } +} + +static unsigned int highbd_get_prediction_error(BLOCK_SIZE bsize, + const struct buf_2d *src, + const struct buf_2d *ref, + int bd) { + unsigned int sse; + const vpx_variance_fn_t fn = highbd_get_block_variance_fn(bsize, bd); + fn(src->buf, src->stride, ref->buf, ref->stride, &sse); + return sse; +} +#endif // CONFIG_VP9_HIGHBITDEPTH + +// Refine the motion search range according to the frame dimension +// for first pass test. +static int get_search_range(const VP9_COMP *cpi) { + int sr = 0; + const int dim = VPXMIN(cpi->initial_width, cpi->initial_height); + + while ((dim << sr) < MAX_FULL_PEL_VAL) ++sr; + return sr; +} + +// Reduce limits to keep the motion search within MV_MAX of ref_mv. Not doing +// this can be problematic for big videos (8K) and may cause assert failure +// (or memory violation) in mv_cost. Limits are only modified if they would +// be non-empty. Returns 1 if limits are non-empty. +static int intersect_limits_with_mv_max(MvLimits *mv_limits, const MV *ref_mv) { + const int row_min = + VPXMAX(mv_limits->row_min, (ref_mv->row + 7 - MV_MAX) >> 3); + const int row_max = + VPXMIN(mv_limits->row_max, (ref_mv->row - 1 + MV_MAX) >> 3); + const int col_min = + VPXMAX(mv_limits->col_min, (ref_mv->col + 7 - MV_MAX) >> 3); + const int col_max = + VPXMIN(mv_limits->col_max, (ref_mv->col - 1 + MV_MAX) >> 3); + if (row_min > row_max || col_min > col_max) { + return 0; + } + mv_limits->row_min = row_min; + mv_limits->row_max = row_max; + mv_limits->col_min = col_min; + mv_limits->col_max = col_max; + return 1; +} + +static void first_pass_motion_search(VP9_COMP *cpi, MACROBLOCK *x, + const MV *ref_mv, MV *best_mv, + int *best_motion_err) { + MACROBLOCKD *const xd = &x->e_mbd; + MV tmp_mv = { 0, 0 }; + MV ref_mv_full = { ref_mv->row >> 3, ref_mv->col >> 3 }; + int num00, tmp_err, n; + const BLOCK_SIZE bsize = xd->mi[0]->sb_type; + vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[bsize]; + const int new_mv_mode_penalty = NEW_MV_MODE_PENALTY; + MV center_mv_full = ref_mv_full; + unsigned int start_mv_sad; + vp9_sad_fn_ptr_t sad_fn_ptr; + + int step_param = 3; + int further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param; + const int sr = get_search_range(cpi); + const MvLimits tmp_mv_limits = x->mv_limits; + step_param += sr; + further_steps -= sr; + + if (!intersect_limits_with_mv_max(&x->mv_limits, ref_mv)) { + return; + } + + // Override the default variance function to use MSE. + v_fn_ptr.vf = get_block_variance_fn(bsize); +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + v_fn_ptr.vf = highbd_get_block_variance_fn(bsize, xd->bd); + } +#endif // CONFIG_VP9_HIGHBITDEPTH + + // Calculate SAD of the start mv + clamp_mv(&ref_mv_full, x->mv_limits.col_min, x->mv_limits.col_max, + x->mv_limits.row_min, x->mv_limits.row_max); + start_mv_sad = get_start_mv_sad(x, &ref_mv_full, ¢er_mv_full, + cpi->fn_ptr[bsize].sdf, x->sadperbit16); + sad_fn_ptr.sdf = cpi->fn_ptr[bsize].sdf; + sad_fn_ptr.sdx4df = cpi->fn_ptr[bsize].sdx4df; + + // Center the initial step/diamond search on best mv. + tmp_err = cpi->diamond_search_sad(x, &cpi->ss_cfg, &ref_mv_full, start_mv_sad, + &tmp_mv, step_param, x->sadperbit16, &num00, + &sad_fn_ptr, ref_mv); + if (tmp_err < INT_MAX) + tmp_err = vp9_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1); + if (tmp_err < INT_MAX - new_mv_mode_penalty) tmp_err += new_mv_mode_penalty; + + if (tmp_err < *best_motion_err) { + *best_motion_err = tmp_err; + *best_mv = tmp_mv; + } + + // Carry out further step/diamond searches as necessary. + n = num00; + num00 = 0; + + while (n < further_steps) { + ++n; + + if (num00) { + --num00; + } else { + tmp_err = cpi->diamond_search_sad( + x, &cpi->ss_cfg, &ref_mv_full, start_mv_sad, &tmp_mv, step_param + n, + x->sadperbit16, &num00, &sad_fn_ptr, ref_mv); + if (tmp_err < INT_MAX) + tmp_err = vp9_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1); + if (tmp_err < INT_MAX - new_mv_mode_penalty) + tmp_err += new_mv_mode_penalty; + + if (tmp_err < *best_motion_err) { + *best_motion_err = tmp_err; + *best_mv = tmp_mv; + } + } + } + x->mv_limits = tmp_mv_limits; +} + +static BLOCK_SIZE get_bsize(const VP9_COMMON *cm, int mb_row, int mb_col) { + if (2 * mb_col + 1 < cm->mi_cols) { + return 2 * mb_row + 1 < cm->mi_rows ? BLOCK_16X16 : BLOCK_16X8; + } else { + return 2 * mb_row + 1 < cm->mi_rows ? BLOCK_8X16 : BLOCK_8X8; + } +} + +static int find_fp_qindex(vpx_bit_depth_t bit_depth) { + int i; + + for (i = 0; i < QINDEX_RANGE; ++i) + if (vp9_convert_qindex_to_q(i, bit_depth) >= FIRST_PASS_Q) break; + + if (i == QINDEX_RANGE) i--; + + return i; +} + +static void set_first_pass_params(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + if (!cpi->refresh_alt_ref_frame && + (cm->current_video_frame == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY))) { + cm->frame_type = KEY_FRAME; + } else { + cm->frame_type = INTER_FRAME; + } + // Do not use periodic key frames. + cpi->rc.frames_to_key = INT_MAX; +} + +// Scale an sse threshold to account for 8/10/12 bit. +static int scale_sse_threshold(VP9_COMMON *cm, int thresh) { + int ret_val = thresh; +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) { + switch (cm->bit_depth) { + case VPX_BITS_8: ret_val = thresh; break; + case VPX_BITS_10: ret_val = thresh << 4; break; + default: + assert(cm->bit_depth == VPX_BITS_12); + ret_val = thresh << 8; + break; + } + } +#else + (void)cm; +#endif // CONFIG_VP9_HIGHBITDEPTH + return ret_val; +} + +// This threshold is used to track blocks where to all intents and purposes +// the intra prediction error 0. Though the metric we test against +// is technically a sse we are mainly interested in blocks where all the pixels +// in the 8 bit domain have an error of <= 1 (where error = sse) so a +// linear scaling for 10 and 12 bit gives similar results. +#define UL_INTRA_THRESH 50 +static int get_ul_intra_threshold(VP9_COMMON *cm) { + int ret_val = UL_INTRA_THRESH; +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) { + switch (cm->bit_depth) { + case VPX_BITS_8: ret_val = UL_INTRA_THRESH; break; + case VPX_BITS_10: ret_val = UL_INTRA_THRESH << 2; break; + default: + assert(cm->bit_depth == VPX_BITS_12); + ret_val = UL_INTRA_THRESH << 4; + break; + } + } +#else + (void)cm; +#endif // CONFIG_VP9_HIGHBITDEPTH + return ret_val; +} + +#define SMOOTH_INTRA_THRESH 4000 +static int get_smooth_intra_threshold(VP9_COMMON *cm) { + int ret_val = SMOOTH_INTRA_THRESH; +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) { + switch (cm->bit_depth) { + case VPX_BITS_8: ret_val = SMOOTH_INTRA_THRESH; break; + case VPX_BITS_10: ret_val = SMOOTH_INTRA_THRESH << 4; break; + default: + assert(cm->bit_depth == VPX_BITS_12); + ret_val = SMOOTH_INTRA_THRESH << 8; + break; + } + } +#else + (void)cm; +#endif // CONFIG_VP9_HIGHBITDEPTH + return ret_val; +} + +#define FP_DN_THRESH 8 +#define FP_MAX_DN_THRESH 24 +#define KERNEL_SIZE 3 + +// Baseline Kernel weights for first pass noise metric +static uint8_t fp_dn_kernel_3[KERNEL_SIZE * KERNEL_SIZE] = { 1, 2, 1, 2, 4, + 2, 1, 2, 1 }; + +// Estimate noise at a single point based on the impact of a spatial kernel +// on the point value +static int fp_estimate_point_noise(uint8_t *src_ptr, const int stride) { + int sum_weight = 0; + int sum_val = 0; + int i, j; + int max_diff = 0; + int diff; + int dn_diff; + uint8_t *tmp_ptr; + uint8_t *kernel_ptr; + uint8_t dn_val; + uint8_t centre_val = *src_ptr; + + kernel_ptr = fp_dn_kernel_3; + + // Apply the kernel + tmp_ptr = src_ptr - stride - 1; + for (i = 0; i < KERNEL_SIZE; ++i) { + for (j = 0; j < KERNEL_SIZE; ++j) { + diff = abs((int)centre_val - (int)tmp_ptr[j]); + max_diff = VPXMAX(max_diff, diff); + if (diff <= FP_DN_THRESH) { + sum_weight += *kernel_ptr; + sum_val += (int)tmp_ptr[j] * (int)*kernel_ptr; + } + ++kernel_ptr; + } + tmp_ptr += stride; + } + + if (max_diff < FP_MAX_DN_THRESH) + // Update the source value with the new filtered value + dn_val = (sum_val + (sum_weight >> 1)) / sum_weight; + else + dn_val = *src_ptr; + + // return the noise energy as the square of the difference between the + // denoised and raw value. + dn_diff = (int)*src_ptr - (int)dn_val; + return dn_diff * dn_diff; +} +#if CONFIG_VP9_HIGHBITDEPTH +static int fp_highbd_estimate_point_noise(uint8_t *src_ptr, const int stride) { + int sum_weight = 0; + int sum_val = 0; + int i, j; + int max_diff = 0; + int diff; + int dn_diff; + uint8_t *tmp_ptr; + uint16_t *tmp_ptr16; + uint8_t *kernel_ptr; + uint16_t dn_val; + uint16_t centre_val = *CONVERT_TO_SHORTPTR(src_ptr); + + kernel_ptr = fp_dn_kernel_3; + + // Apply the kernel + tmp_ptr = src_ptr - stride - 1; + for (i = 0; i < KERNEL_SIZE; ++i) { + tmp_ptr16 = CONVERT_TO_SHORTPTR(tmp_ptr); + for (j = 0; j < KERNEL_SIZE; ++j) { + diff = abs((int)centre_val - (int)tmp_ptr16[j]); + max_diff = VPXMAX(max_diff, diff); + if (diff <= FP_DN_THRESH) { + sum_weight += *kernel_ptr; + sum_val += (int)tmp_ptr16[j] * (int)*kernel_ptr; + } + ++kernel_ptr; + } + tmp_ptr += stride; + } + + if (max_diff < FP_MAX_DN_THRESH) + // Update the source value with the new filtered value + dn_val = (sum_val + (sum_weight >> 1)) / sum_weight; + else + dn_val = *CONVERT_TO_SHORTPTR(src_ptr); + + // return the noise energy as the square of the difference between the + // denoised and raw value. + dn_diff = (int)(*CONVERT_TO_SHORTPTR(src_ptr)) - (int)dn_val; + return dn_diff * dn_diff; +} +#endif + +// Estimate noise for a block. +static int fp_estimate_block_noise(MACROBLOCK *x, BLOCK_SIZE bsize) { +#if CONFIG_VP9_HIGHBITDEPTH + MACROBLOCKD *xd = &x->e_mbd; +#endif + uint8_t *src_ptr = &x->plane[0].src.buf[0]; + const int width = num_4x4_blocks_wide_lookup[bsize] * 4; + const int height = num_4x4_blocks_high_lookup[bsize] * 4; + int w, h; + int stride = x->plane[0].src.stride; + int block_noise = 0; + + // Sampled points to reduce cost overhead. + for (h = 0; h < height; h += 2) { + for (w = 0; w < width; w += 2) { +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) + block_noise += fp_highbd_estimate_point_noise(src_ptr, stride); + else + block_noise += fp_estimate_point_noise(src_ptr, stride); +#else + block_noise += fp_estimate_point_noise(src_ptr, stride); +#endif + ++src_ptr; + } + src_ptr += (stride - width); + } + return block_noise << 2; // Scale << 2 to account for sampling. +} + +// This function is called to test the functionality of row based +// multi-threading in unit tests for bit-exactness +static void accumulate_floating_point_stats(VP9_COMP *cpi, + TileDataEnc *first_tile_col) { + VP9_COMMON *const cm = &cpi->common; + int mb_row, mb_col; + first_tile_col->fp_data.intra_factor = 0; + first_tile_col->fp_data.brightness_factor = 0; + first_tile_col->fp_data.neutral_count = 0; + for (mb_row = 0; mb_row < cm->mb_rows; ++mb_row) { + for (mb_col = 0; mb_col < cm->mb_cols; ++mb_col) { + const int mb_index = mb_row * cm->mb_cols + mb_col; + first_tile_col->fp_data.intra_factor += + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_intra_factor; + first_tile_col->fp_data.brightness_factor += + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_brightness_factor; + first_tile_col->fp_data.neutral_count += + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_neutral_count; + } + } +} + +static void first_pass_stat_calc(VP9_COMP *cpi, FIRSTPASS_STATS *fps, + FIRSTPASS_DATA *fp_acc_data) { + VP9_COMMON *const cm = &cpi->common; + // The minimum error here insures some bit allocation to frames even + // in static regions. The allocation per MB declines for larger formats + // where the typical "real" energy per MB also falls. + // Initial estimate here uses sqrt(mbs) to define the min_err, where the + // number of mbs is proportional to the image area. + const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE) ? cpi->initial_mbs + : cpi->common.MBs; + const double min_err = 200 * sqrt(num_mbs); + + // Clamp the image start to rows/2. This number of rows is discarded top + // and bottom as dead data so rows / 2 means the frame is blank. + if ((fp_acc_data->image_data_start_row > cm->mb_rows / 2) || + (fp_acc_data->image_data_start_row == INVALID_ROW)) { + fp_acc_data->image_data_start_row = cm->mb_rows / 2; + } + // Exclude any image dead zone + if (fp_acc_data->image_data_start_row > 0) { + fp_acc_data->intra_skip_count = + VPXMAX(0, fp_acc_data->intra_skip_count - + (fp_acc_data->image_data_start_row * cm->mb_cols * 2)); + } + + fp_acc_data->intra_factor = fp_acc_data->intra_factor / (double)num_mbs; + fp_acc_data->brightness_factor = + fp_acc_data->brightness_factor / (double)num_mbs; + fps->weight = fp_acc_data->intra_factor * fp_acc_data->brightness_factor; + + fps->frame = cm->current_video_frame; + fps->spatial_layer_id = cpi->svc.spatial_layer_id; + + fps->coded_error = + ((double)(fp_acc_data->coded_error >> 8) + min_err) / num_mbs; + fps->sr_coded_error = + ((double)(fp_acc_data->sr_coded_error >> 8) + min_err) / num_mbs; + fps->intra_error = + ((double)(fp_acc_data->intra_error >> 8) + min_err) / num_mbs; + + fps->frame_noise_energy = + (double)(fp_acc_data->frame_noise_energy) / (double)num_mbs; + fps->count = 1.0; + fps->pcnt_inter = (double)(fp_acc_data->intercount) / num_mbs; + fps->pcnt_second_ref = (double)(fp_acc_data->second_ref_count) / num_mbs; + fps->pcnt_neutral = (double)(fp_acc_data->neutral_count) / num_mbs; + fps->pcnt_intra_low = (double)(fp_acc_data->intra_count_low) / num_mbs; + fps->pcnt_intra_high = (double)(fp_acc_data->intra_count_high) / num_mbs; + fps->intra_skip_pct = (double)(fp_acc_data->intra_skip_count) / num_mbs; + fps->intra_smooth_pct = (double)(fp_acc_data->intra_smooth_count) / num_mbs; + fps->inactive_zone_rows = (double)(fp_acc_data->image_data_start_row); + // Currently set to 0 as most issues relate to letter boxing. + fps->inactive_zone_cols = (double)0; + + if (fp_acc_data->mvcount > 0) { + fps->new_mv_count = (double)(fp_acc_data->new_mv_count) / num_mbs; + fps->MVr = (double)(fp_acc_data->sum_mvr) / fp_acc_data->mvcount; + fps->mvr_abs = (double)(fp_acc_data->sum_mvr_abs) / fp_acc_data->mvcount; + fps->MVc = (double)(fp_acc_data->sum_mvc) / fp_acc_data->mvcount; + fps->mvc_abs = (double)(fp_acc_data->sum_mvc_abs) / fp_acc_data->mvcount; + fps->MVrv = ((double)(fp_acc_data->sum_mvrs) - + ((double)(fp_acc_data->sum_mvr) * (fp_acc_data->sum_mvr) / + fp_acc_data->mvcount)) / + fp_acc_data->mvcount; + fps->MVcv = ((double)(fp_acc_data->sum_mvcs) - + ((double)(fp_acc_data->sum_mvc) * (fp_acc_data->sum_mvc) / + fp_acc_data->mvcount)) / + fp_acc_data->mvcount; + fps->mv_in_out_count = + (double)(fp_acc_data->sum_in_vectors) / (fp_acc_data->mvcount * 2); + fps->pcnt_motion = (double)(fp_acc_data->mvcount) / num_mbs; + } else { + fps->new_mv_count = 0.0; + fps->MVr = 0.0; + fps->mvr_abs = 0.0; + fps->MVc = 0.0; + fps->mvc_abs = 0.0; + fps->MVrv = 0.0; + fps->MVcv = 0.0; + fps->mv_in_out_count = 0.0; + fps->pcnt_motion = 0.0; + } +} + +static void accumulate_fp_mb_row_stat(TileDataEnc *this_tile, + FIRSTPASS_DATA *fp_acc_data) { + this_tile->fp_data.intra_factor += fp_acc_data->intra_factor; + this_tile->fp_data.brightness_factor += fp_acc_data->brightness_factor; + this_tile->fp_data.coded_error += fp_acc_data->coded_error; + this_tile->fp_data.sr_coded_error += fp_acc_data->sr_coded_error; + this_tile->fp_data.frame_noise_energy += fp_acc_data->frame_noise_energy; + this_tile->fp_data.intra_error += fp_acc_data->intra_error; + this_tile->fp_data.intercount += fp_acc_data->intercount; + this_tile->fp_data.second_ref_count += fp_acc_data->second_ref_count; + this_tile->fp_data.neutral_count += fp_acc_data->neutral_count; + this_tile->fp_data.intra_count_low += fp_acc_data->intra_count_low; + this_tile->fp_data.intra_count_high += fp_acc_data->intra_count_high; + this_tile->fp_data.intra_skip_count += fp_acc_data->intra_skip_count; + this_tile->fp_data.new_mv_count += fp_acc_data->new_mv_count; + this_tile->fp_data.mvcount += fp_acc_data->mvcount; + this_tile->fp_data.sum_mvr += fp_acc_data->sum_mvr; + this_tile->fp_data.sum_mvr_abs += fp_acc_data->sum_mvr_abs; + this_tile->fp_data.sum_mvc += fp_acc_data->sum_mvc; + this_tile->fp_data.sum_mvc_abs += fp_acc_data->sum_mvc_abs; + this_tile->fp_data.sum_mvrs += fp_acc_data->sum_mvrs; + this_tile->fp_data.sum_mvcs += fp_acc_data->sum_mvcs; + this_tile->fp_data.sum_in_vectors += fp_acc_data->sum_in_vectors; + this_tile->fp_data.intra_smooth_count += fp_acc_data->intra_smooth_count; + this_tile->fp_data.image_data_start_row = + VPXMIN(this_tile->fp_data.image_data_start_row, + fp_acc_data->image_data_start_row) == INVALID_ROW + ? VPXMAX(this_tile->fp_data.image_data_start_row, + fp_acc_data->image_data_start_row) + : VPXMIN(this_tile->fp_data.image_data_start_row, + fp_acc_data->image_data_start_row); +} + +#if CONFIG_RATE_CTRL +static void store_fp_motion_vector(VP9_COMP *cpi, const MV *mv, + const int mb_row, const int mb_col, + MV_REFERENCE_FRAME frame_type, + const int mv_idx) { + VP9_COMMON *const cm = &cpi->common; + const int mb_index = mb_row * cm->mb_cols + mb_col; + MOTION_VECTOR_INFO *this_motion_vector_info = + &cpi->fp_motion_vector_info[mb_index]; + this_motion_vector_info->ref_frame[mv_idx] = frame_type; + if (frame_type != INTRA_FRAME) { + this_motion_vector_info->mv[mv_idx].as_mv = *mv; + } +} +#endif // CONFIG_RATE_CTRL + +#define NZ_MOTION_PENALTY 128 +#define INTRA_MODE_PENALTY 1024 +void vp9_first_pass_encode_tile_mb_row(VP9_COMP *cpi, ThreadData *td, + FIRSTPASS_DATA *fp_acc_data, + TileDataEnc *tile_data, MV *best_ref_mv, + int mb_row) { + int mb_col; + MACROBLOCK *const x = &td->mb; + VP9_COMMON *const cm = &cpi->common; + MACROBLOCKD *const xd = &x->e_mbd; + TileInfo tile = tile_data->tile_info; + const int mb_col_start = ROUND_POWER_OF_TWO(tile.mi_col_start, 1); + const int mb_col_end = ROUND_POWER_OF_TWO(tile.mi_col_end, 1); + struct macroblock_plane *const p = x->plane; + struct macroblockd_plane *const pd = xd->plane; + const PICK_MODE_CONTEXT *ctx = &td->pc_root->none; + int i, c; + int num_mb_cols = get_num_cols(tile_data->tile_info, 1); + + int recon_yoffset, recon_uvoffset; + const int intrapenalty = INTRA_MODE_PENALTY; + const MV zero_mv = { 0, 0 }; + int recon_y_stride, recon_uv_stride, uv_mb_height; + + YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME); + YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME); + YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm); + const YV12_BUFFER_CONFIG *first_ref_buf = lst_yv12; + + MODE_INFO mi_above, mi_left; + + double mb_intra_factor; + double mb_brightness_factor; + double mb_neutral_count; + int scaled_low_intra_thresh = scale_sse_threshold(cm, LOW_I_THRESH); + + MV *first_top_mv = &tile_data->firstpass_top_mv; + MV last_nonzero_mv = { 0, 0 }; + + // First pass code requires valid last and new frame buffers. + assert(new_yv12 != NULL); + assert(frame_is_intra_only(cm) || (lst_yv12 != NULL)); + + xd->mi = cm->mi_grid_visible + xd->mi_stride * (mb_row << 1) + mb_col_start; + xd->mi[0] = cm->mi + xd->mi_stride * (mb_row << 1) + mb_col_start; + + for (i = 0; i < MAX_MB_PLANE; ++i) { + p[i].coeff = ctx->coeff_pbuf[i][1]; + p[i].qcoeff = ctx->qcoeff_pbuf[i][1]; + pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][1]; + p[i].eobs = ctx->eobs_pbuf[i][1]; + } + + recon_y_stride = new_yv12->y_stride; + recon_uv_stride = new_yv12->uv_stride; + uv_mb_height = 16 >> (new_yv12->y_height > new_yv12->uv_height); + + // Reset above block coeffs. + recon_yoffset = (mb_row * recon_y_stride * 16) + mb_col_start * 16; + recon_uvoffset = + (mb_row * recon_uv_stride * uv_mb_height) + mb_col_start * uv_mb_height; + + // Set up limit values for motion vectors to prevent them extending + // outside the UMV borders. + x->mv_limits.row_min = -((mb_row * 16) + BORDER_MV_PIXELS_B16); + x->mv_limits.row_max = + ((cm->mb_rows - 1 - mb_row) * 16) + BORDER_MV_PIXELS_B16; + + for (mb_col = mb_col_start, c = 0; mb_col < mb_col_end; ++mb_col, c++) { + int this_error; + int this_intra_error; + const int use_dc_pred = (mb_col || mb_row) && (!mb_col || !mb_row); + const BLOCK_SIZE bsize = get_bsize(cm, mb_row, mb_col); + double log_intra; + int level_sample; + const int mb_index = mb_row * cm->mb_cols + mb_col; + + (*(cpi->row_mt_sync_read_ptr))(&tile_data->row_mt_sync, mb_row, c); + + if (mb_col == mb_col_start) { + last_nonzero_mv = *first_top_mv; + } + + // Adjust to the next column of MBs. + x->plane[0].src.buf = cpi->Source->y_buffer + + mb_row * 16 * x->plane[0].src.stride + mb_col * 16; + x->plane[1].src.buf = cpi->Source->u_buffer + + mb_row * uv_mb_height * x->plane[1].src.stride + + mb_col * uv_mb_height; + x->plane[2].src.buf = cpi->Source->v_buffer + + mb_row * uv_mb_height * x->plane[1].src.stride + + mb_col * uv_mb_height; + + vpx_clear_system_state(); + + xd->plane[0].dst.buf = new_yv12->y_buffer + recon_yoffset; + xd->plane[1].dst.buf = new_yv12->u_buffer + recon_uvoffset; + xd->plane[2].dst.buf = new_yv12->v_buffer + recon_uvoffset; + xd->mi[0]->sb_type = bsize; + xd->mi[0]->ref_frame[0] = INTRA_FRAME; + set_mi_row_col(xd, &tile, mb_row << 1, num_8x8_blocks_high_lookup[bsize], + mb_col << 1, num_8x8_blocks_wide_lookup[bsize], cm->mi_rows, + cm->mi_cols); + // Are edges available for intra prediction? + // Since the firstpass does not populate the mi_grid_visible, + // above_mi/left_mi must be overwritten with a nonzero value when edges + // are available. Required by vp9_predict_intra_block(). + xd->above_mi = (mb_row != 0) ? &mi_above : NULL; + xd->left_mi = ((mb_col << 1) > tile.mi_col_start) ? &mi_left : NULL; + + // Do intra 16x16 prediction. + x->skip_encode = 0; + x->fp_src_pred = 0; + // Do intra prediction based on source pixels for tile boundaries + if (mb_col == mb_col_start && mb_col != 0) { + xd->left_mi = &mi_left; + x->fp_src_pred = 1; + } + xd->mi[0]->mode = DC_PRED; + xd->mi[0]->tx_size = + use_dc_pred ? (bsize >= BLOCK_16X16 ? TX_16X16 : TX_8X8) : TX_4X4; + // Fix - zero the 16x16 block first. This ensures correct this_error for + // block sizes smaller than 16x16. + vp9_zero_array(x->plane[0].src_diff, 256); + vp9_encode_intra_block_plane(x, bsize, 0, 0); + this_error = vpx_get_mb_ss(x->plane[0].src_diff); + this_intra_error = this_error; + + // Keep a record of blocks that have very low intra error residual + // (i.e. are in effect completely flat and untextured in the intra + // domain). In natural videos this is uncommon, but it is much more + // common in animations, graphics and screen content, so may be used + // as a signal to detect these types of content. + if (this_error < get_ul_intra_threshold(cm)) { + ++(fp_acc_data->intra_skip_count); + } else if ((mb_col > 0) && + (fp_acc_data->image_data_start_row == INVALID_ROW)) { + fp_acc_data->image_data_start_row = mb_row; + } + + // Blocks that are mainly smooth in the intra domain. + // Some special accounting for CQ but also these are better for testing + // noise levels. + if (this_error < get_smooth_intra_threshold(cm)) { + ++(fp_acc_data->intra_smooth_count); + } + + // Special case noise measurement for first frame. + if (cm->current_video_frame == 0) { + if (this_intra_error < scale_sse_threshold(cm, LOW_I_THRESH)) { + fp_acc_data->frame_noise_energy += fp_estimate_block_noise(x, bsize); + } else { + fp_acc_data->frame_noise_energy += (int64_t)SECTION_NOISE_DEF; + } + } + +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) { + switch (cm->bit_depth) { + case VPX_BITS_8: break; + case VPX_BITS_10: this_error >>= 4; break; + default: + assert(cm->bit_depth == VPX_BITS_12); + this_error >>= 8; + break; + } + } +#endif // CONFIG_VP9_HIGHBITDEPTH + + vpx_clear_system_state(); + log_intra = log(this_error + 1.0); + if (log_intra < 10.0) { + mb_intra_factor = 1.0 + ((10.0 - log_intra) * 0.05); + fp_acc_data->intra_factor += mb_intra_factor; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_intra_factor = + mb_intra_factor; + } else { + fp_acc_data->intra_factor += 1.0; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_intra_factor = 1.0; + } + +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) + level_sample = CONVERT_TO_SHORTPTR(x->plane[0].src.buf)[0]; + else + level_sample = x->plane[0].src.buf[0]; +#else + level_sample = x->plane[0].src.buf[0]; +#endif + if ((level_sample < DARK_THRESH) && (log_intra < 9.0)) { + mb_brightness_factor = 1.0 + (0.01 * (DARK_THRESH - level_sample)); + fp_acc_data->brightness_factor += mb_brightness_factor; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_brightness_factor = + mb_brightness_factor; + } else { + fp_acc_data->brightness_factor += 1.0; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_brightness_factor = + 1.0; + } + + // Intrapenalty below deals with situations where the intra and inter + // error scores are very low (e.g. a plain black frame). + // We do not have special cases in first pass for 0,0 and nearest etc so + // all inter modes carry an overhead cost estimate for the mv. + // When the error score is very low this causes us to pick all or lots of + // INTRA modes and throw lots of key frames. + // This penalty adds a cost matching that of a 0,0 mv to the intra case. + this_error += intrapenalty; + + // Accumulate the intra error. + fp_acc_data->intra_error += (int64_t)this_error; + + // Set up limit values for motion vectors to prevent them extending + // outside the UMV borders. + x->mv_limits.col_min = -((mb_col * 16) + BORDER_MV_PIXELS_B16); + x->mv_limits.col_max = + ((cm->mb_cols - 1 - mb_col) * 16) + BORDER_MV_PIXELS_B16; + + // Other than for intra-only frame do a motion search. + if (!frame_is_intra_only(cm)) { + int tmp_err, motion_error, this_motion_error, raw_motion_error; + // Assume 0,0 motion with no mv overhead. + MV mv = { 0, 0 }, tmp_mv = { 0, 0 }; + struct buf_2d unscaled_last_source_buf_2d; + vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[bsize]; + +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + // Store zero mv as default + store_fp_motion_vector(cpi, &mv, mb_row, mb_col, LAST_FRAME, 0); + } +#endif // CONFIG_RAGE_CTRL + + xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset; +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + motion_error = highbd_get_prediction_error( + bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd); + this_motion_error = highbd_get_prediction_error( + bsize, &x->plane[0].src, &xd->plane[0].pre[0], 8); + } else { + motion_error = + get_prediction_error(bsize, &x->plane[0].src, &xd->plane[0].pre[0]); + this_motion_error = motion_error; + } +#else + motion_error = + get_prediction_error(bsize, &x->plane[0].src, &xd->plane[0].pre[0]); + this_motion_error = motion_error; +#endif // CONFIG_VP9_HIGHBITDEPTH + + // Compute the motion error of the 0,0 motion using the last source + // frame as the reference. Skip the further motion search on + // reconstructed frame if this error is very small. + unscaled_last_source_buf_2d.buf = + cpi->unscaled_last_source->y_buffer + recon_yoffset; + unscaled_last_source_buf_2d.stride = cpi->unscaled_last_source->y_stride; +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + raw_motion_error = highbd_get_prediction_error( + bsize, &x->plane[0].src, &unscaled_last_source_buf_2d, xd->bd); + } else { + raw_motion_error = get_prediction_error(bsize, &x->plane[0].src, + &unscaled_last_source_buf_2d); + } +#else + raw_motion_error = get_prediction_error(bsize, &x->plane[0].src, + &unscaled_last_source_buf_2d); +#endif // CONFIG_VP9_HIGHBITDEPTH + + if (raw_motion_error > NZ_MOTION_PENALTY) { + // Test last reference frame using the previous best mv as the + // starting point (best reference) for the search. + first_pass_motion_search(cpi, x, best_ref_mv, &mv, &motion_error); + + v_fn_ptr.vf = get_block_variance_fn(bsize); +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + v_fn_ptr.vf = highbd_get_block_variance_fn(bsize, 8); + } +#endif // CONFIG_VP9_HIGHBITDEPTH + this_motion_error = + vp9_get_mvpred_var(x, &mv, best_ref_mv, &v_fn_ptr, 0); + + // If the current best reference mv is not centered on 0,0 then do a + // 0,0 based search as well. + if (!is_zero_mv(best_ref_mv)) { + tmp_err = INT_MAX; + first_pass_motion_search(cpi, x, &zero_mv, &tmp_mv, &tmp_err); + + if (tmp_err < motion_error) { + motion_error = tmp_err; + mv = tmp_mv; + this_motion_error = + vp9_get_mvpred_var(x, &tmp_mv, &zero_mv, &v_fn_ptr, 0); + } + } +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + store_fp_motion_vector(cpi, &mv, mb_row, mb_col, LAST_FRAME, 0); + } +#endif // CONFIG_RAGE_CTRL + + // Search in an older reference frame. + if ((cm->current_video_frame > 1) && gld_yv12 != NULL) { + // Assume 0,0 motion with no mv overhead. + int gf_motion_error; + + xd->plane[0].pre[0].buf = gld_yv12->y_buffer + recon_yoffset; +#if CONFIG_VP9_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + gf_motion_error = highbd_get_prediction_error( + bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd); + } else { + gf_motion_error = get_prediction_error(bsize, &x->plane[0].src, + &xd->plane[0].pre[0]); + } +#else + gf_motion_error = get_prediction_error(bsize, &x->plane[0].src, + &xd->plane[0].pre[0]); +#endif // CONFIG_VP9_HIGHBITDEPTH + + first_pass_motion_search(cpi, x, &zero_mv, &tmp_mv, &gf_motion_error); +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + store_fp_motion_vector(cpi, &tmp_mv, mb_row, mb_col, GOLDEN_FRAME, + 1); + } +#endif // CONFIG_RAGE_CTRL + + if (gf_motion_error < motion_error && gf_motion_error < this_error) + ++(fp_acc_data->second_ref_count); + + // Reset to last frame as reference buffer. + xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset; + xd->plane[1].pre[0].buf = first_ref_buf->u_buffer + recon_uvoffset; + xd->plane[2].pre[0].buf = first_ref_buf->v_buffer + recon_uvoffset; + + // In accumulating a score for the older reference frame take the + // best of the motion predicted score and the intra coded error + // (just as will be done for) accumulation of "coded_error" for + // the last frame. + if (gf_motion_error < this_error) + fp_acc_data->sr_coded_error += gf_motion_error; + else + fp_acc_data->sr_coded_error += this_error; + } else { + fp_acc_data->sr_coded_error += motion_error; + } + } else { + fp_acc_data->sr_coded_error += motion_error; + } + + // Start by assuming that intra mode is best. + best_ref_mv->row = 0; + best_ref_mv->col = 0; + + if (motion_error <= this_error) { + vpx_clear_system_state(); + + // Keep a count of cases where the inter and intra were very close + // and very low. This helps with scene cut detection for example in + // cropped clips with black bars at the sides or top and bottom. + if (((this_error - intrapenalty) * 9 <= motion_error * 10) && + (this_error < (2 * intrapenalty))) { + fp_acc_data->neutral_count += 1.0; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_neutral_count = + 1.0; + // Also track cases where the intra is not much worse than the inter + // and use this in limiting the GF/arf group length. + } else if ((this_error > NCOUNT_INTRA_THRESH) && + (this_error < (NCOUNT_INTRA_FACTOR * motion_error))) { + mb_neutral_count = + (double)motion_error / DOUBLE_DIVIDE_CHECK((double)this_error); + fp_acc_data->neutral_count += mb_neutral_count; + if (cpi->row_mt_bit_exact) + cpi->twopass.fp_mb_float_stats[mb_index].frame_mb_neutral_count = + mb_neutral_count; + } + + mv.row *= 8; + mv.col *= 8; + this_error = motion_error; + xd->mi[0]->mode = NEWMV; + xd->mi[0]->mv[0].as_mv = mv; + xd->mi[0]->tx_size = TX_4X4; + xd->mi[0]->ref_frame[0] = LAST_FRAME; + xd->mi[0]->ref_frame[1] = NO_REF_FRAME; + vp9_build_inter_predictors_sby(xd, mb_row << 1, mb_col << 1, bsize); + vp9_encode_sby_pass1(x, bsize); + fp_acc_data->sum_mvr += mv.row; + fp_acc_data->sum_mvr_abs += abs(mv.row); + fp_acc_data->sum_mvc += mv.col; + fp_acc_data->sum_mvc_abs += abs(mv.col); + fp_acc_data->sum_mvrs += mv.row * mv.row; + fp_acc_data->sum_mvcs += mv.col * mv.col; + ++(fp_acc_data->intercount); + + *best_ref_mv = mv; + + if (!is_zero_mv(&mv)) { + ++(fp_acc_data->mvcount); + if (!is_equal_mv(&mv, &last_nonzero_mv)) { + ++(fp_acc_data->new_mv_count); + } + last_nonzero_mv = mv; + + // Does the row vector point inwards or outwards? + if (mb_row < cm->mb_rows / 2) { + if (mv.row > 0) + --(fp_acc_data->sum_in_vectors); + else if (mv.row < 0) + ++(fp_acc_data->sum_in_vectors); + } else if (mb_row > cm->mb_rows / 2) { + if (mv.row > 0) + ++(fp_acc_data->sum_in_vectors); + else if (mv.row < 0) + --(fp_acc_data->sum_in_vectors); + } + + // Does the col vector point inwards or outwards? + if (mb_col < cm->mb_cols / 2) { + if (mv.col > 0) + --(fp_acc_data->sum_in_vectors); + else if (mv.col < 0) + ++(fp_acc_data->sum_in_vectors); + } else if (mb_col > cm->mb_cols / 2) { + if (mv.col > 0) + ++(fp_acc_data->sum_in_vectors); + else if (mv.col < 0) + --(fp_acc_data->sum_in_vectors); + } + } + if (this_intra_error < scaled_low_intra_thresh) { + fp_acc_data->frame_noise_energy += fp_estimate_block_noise(x, bsize); + } else { + fp_acc_data->frame_noise_energy += (int64_t)SECTION_NOISE_DEF; + } + } else { // Intra < inter error + if (this_intra_error < scaled_low_intra_thresh) { + fp_acc_data->frame_noise_energy += fp_estimate_block_noise(x, bsize); + if (this_motion_error < scaled_low_intra_thresh) { + fp_acc_data->intra_count_low += 1.0; + } else { + fp_acc_data->intra_count_high += 1.0; + } + } else { + fp_acc_data->frame_noise_energy += (int64_t)SECTION_NOISE_DEF; + fp_acc_data->intra_count_high += 1.0; + } + } + } else { + fp_acc_data->sr_coded_error += (int64_t)this_error; +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + store_fp_motion_vector(cpi, NULL, mb_row, mb_col, INTRA_FRAME, 0); + } +#endif // CONFIG_RAGE_CTRL + } + fp_acc_data->coded_error += (int64_t)this_error; + + if (mb_col == mb_col_start) { + *first_top_mv = last_nonzero_mv; + } + recon_yoffset += 16; + recon_uvoffset += uv_mb_height; + + // Accumulate row level stats to the corresponding tile stats + if (cpi->row_mt && mb_col == mb_col_end - 1) + accumulate_fp_mb_row_stat(tile_data, fp_acc_data); + + (*(cpi->row_mt_sync_write_ptr))(&tile_data->row_mt_sync, mb_row, c, + num_mb_cols); + } + vpx_clear_system_state(); +} + +static void first_pass_encode(VP9_COMP *cpi, FIRSTPASS_DATA *fp_acc_data) { + VP9_COMMON *const cm = &cpi->common; + int mb_row; + TileDataEnc tile_data; + TileInfo *tile = &tile_data.tile_info; + MV zero_mv = { 0, 0 }; + MV best_ref_mv; + // Tiling is ignored in the first pass. + vp9_tile_init(tile, cm, 0, 0); + tile_data.firstpass_top_mv = zero_mv; +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + fp_motion_vector_info_reset(cpi->frame_info.frame_width, + cpi->frame_info.frame_height, + cpi->fp_motion_vector_info); + } +#endif + + for (mb_row = 0; mb_row < cm->mb_rows; ++mb_row) { + best_ref_mv = zero_mv; + vp9_first_pass_encode_tile_mb_row(cpi, &cpi->td, fp_acc_data, &tile_data, + &best_ref_mv, mb_row); + } +} + +void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) { + MACROBLOCK *const x = &cpi->td.mb; + VP9_COMMON *const cm = &cpi->common; + MACROBLOCKD *const xd = &x->e_mbd; + TWO_PASS *twopass = &cpi->twopass; + + YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME); + YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME); + YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm); + const YV12_BUFFER_CONFIG *first_ref_buf = lst_yv12; + + BufferPool *const pool = cm->buffer_pool; + + FIRSTPASS_DATA fp_temp_data; + FIRSTPASS_DATA *fp_acc_data = &fp_temp_data; + + vpx_clear_system_state(); + vp9_zero(fp_temp_data); + fp_acc_data->image_data_start_row = INVALID_ROW; + + // First pass code requires valid last and new frame buffers. + assert(new_yv12 != NULL); + assert(frame_is_intra_only(cm) || (lst_yv12 != NULL)); + + set_first_pass_params(cpi); + vp9_set_quantizer(cpi, find_fp_qindex(cm->bit_depth)); + + vp9_setup_block_planes(&x->e_mbd, cm->subsampling_x, cm->subsampling_y); + + vp9_setup_src_planes(x, cpi->Source, 0, 0); + vp9_setup_dst_planes(xd->plane, new_yv12, 0, 0); + + if (!frame_is_intra_only(cm)) { + vp9_setup_pre_planes(xd, 0, first_ref_buf, 0, 0, NULL); + } + + xd->mi = cm->mi_grid_visible; + xd->mi[0] = cm->mi; + + vp9_frame_init_quantizer(cpi); + + x->skip_recode = 0; + + vp9_init_mv_probs(cm); + vp9_initialize_rd_consts(cpi); + + cm->log2_tile_rows = 0; + + if (cpi->row_mt_bit_exact && cpi->twopass.fp_mb_float_stats == NULL) + CHECK_MEM_ERROR( + &cm->error, cpi->twopass.fp_mb_float_stats, + vpx_calloc(cm->MBs * sizeof(*cpi->twopass.fp_mb_float_stats), 1)); + + { + FIRSTPASS_STATS fps; + TileDataEnc *first_tile_col; + if (!cpi->row_mt) { + cm->log2_tile_cols = 0; + cpi->row_mt_sync_read_ptr = vp9_row_mt_sync_read_dummy; + cpi->row_mt_sync_write_ptr = vp9_row_mt_sync_write_dummy; + first_pass_encode(cpi, fp_acc_data); + first_pass_stat_calc(cpi, &fps, fp_acc_data); + } else { + cpi->row_mt_sync_read_ptr = vp9_row_mt_sync_read; + cpi->row_mt_sync_write_ptr = vp9_row_mt_sync_write; + if (cpi->row_mt_bit_exact) { + cm->log2_tile_cols = 0; + vp9_zero_array(cpi->twopass.fp_mb_float_stats, cm->MBs); + } + vp9_encode_fp_row_mt(cpi); + first_tile_col = &cpi->tile_data[0]; + if (cpi->row_mt_bit_exact) + accumulate_floating_point_stats(cpi, first_tile_col); + first_pass_stat_calc(cpi, &fps, &(first_tile_col->fp_data)); + } + + // Don't allow a value of 0 for duration. + // (Section duration is also defaulted to minimum of 1.0). + fps.duration = VPXMAX(1.0, (double)(source->ts_end - source->ts_start)); + + // Don't want to do output stats with a stack variable! + twopass->this_frame_stats = fps; + output_stats(&twopass->this_frame_stats); + accumulate_stats(&twopass->total_stats, &fps); + } + + // Copy the previous Last Frame back into gf and arf buffers if + // the prediction is good enough... but also don't allow it to lag too far. + if ((twopass->sr_update_lag > 3) || + ((cm->current_video_frame > 0) && + (twopass->this_frame_stats.pcnt_inter > 0.20) && + ((twopass->this_frame_stats.intra_error / + DOUBLE_DIVIDE_CHECK(twopass->this_frame_stats.coded_error)) > 2.0))) { + if (gld_yv12 != NULL) { + ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx], + cm->ref_frame_map[cpi->lst_fb_idx]); + } + twopass->sr_update_lag = 1; + } else { + ++twopass->sr_update_lag; + } + + vpx_extend_frame_borders(new_yv12); + + // The frame we just compressed now becomes the last frame. + ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->lst_fb_idx], + cm->new_fb_idx); + + // Special case for the first frame. Copy into the GF buffer as a second + // reference. + if (cm->current_video_frame == 0 && cpi->gld_fb_idx != INVALID_IDX) { + ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx], + cm->ref_frame_map[cpi->lst_fb_idx]); + } + + // In the first pass, every frame is considered as a show frame. + update_frame_indexes(cm, /*show_frame=*/1); + if (cpi->use_svc) vp9_inc_frame_in_layer(cpi); +} + +static const double q_pow_term[(QINDEX_RANGE >> 5) + 1] = { 0.65, 0.70, 0.75, + 0.85, 0.90, 0.90, + 0.90, 1.00, 1.25 }; + +static double calc_correction_factor(double err_per_mb, double err_divisor, + int q) { + const double error_term = err_per_mb / DOUBLE_DIVIDE_CHECK(err_divisor); + const int index = q >> 5; + double power_term; + + assert((index >= 0) && (index < (QINDEX_RANGE >> 5))); + + // Adjustment based on quantizer to the power term. + power_term = + q_pow_term[index] + + (((q_pow_term[index + 1] - q_pow_term[index]) * (q % 32)) / 32.0); + + // Calculate correction factor. + if (power_term < 1.0) assert(error_term >= 0.0); + + return fclamp(pow(error_term, power_term), 0.05, 5.0); +} + +static double wq_err_divisor(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + unsigned int screen_area = (cm->width * cm->height); + + // Use a different error per mb factor for calculating boost for + // different formats. + if (screen_area <= 640 * 360) { + return 115.0; + } else if (screen_area < 1280 * 720) { + return 125.0; + } else if (screen_area <= 1920 * 1080) { + return 130.0; + } else if (screen_area < 3840 * 2160) { + return 150.0; + } + + // Fall through to here only for 4K and above. + return 200.0; +} + +#define NOISE_FACTOR_MIN 0.9 +#define NOISE_FACTOR_MAX 1.1 +static int get_twopass_worst_quality(VP9_COMP *cpi, const double section_err, + double inactive_zone, double section_noise, + int section_target_bandwidth) { + const RATE_CONTROL *const rc = &cpi->rc; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + TWO_PASS *const twopass = &cpi->twopass; + double last_group_rate_err; + + // Clamp the target rate to VBR min / max limts. + const int target_rate = + vp9_rc_clamp_pframe_target_size(cpi, section_target_bandwidth); + double noise_factor = pow((section_noise / SECTION_NOISE_DEF), 0.5); + noise_factor = fclamp(noise_factor, NOISE_FACTOR_MIN, NOISE_FACTOR_MAX); + inactive_zone = fclamp(inactive_zone, 0.0, 1.0); + +// TODO(jimbankoski): remove #if here or below when this has been +// well tested. +#if CONFIG_ALWAYS_ADJUST_BPM + // based on recent history adjust expectations of bits per macroblock. + last_group_rate_err = + (double)twopass->rolling_arf_group_actual_bits / + DOUBLE_DIVIDE_CHECK((double)twopass->rolling_arf_group_target_bits); + last_group_rate_err = VPXMAX(0.25, VPXMIN(4.0, last_group_rate_err)); + twopass->bpm_factor *= (3.0 + last_group_rate_err) / 4.0; + twopass->bpm_factor = VPXMAX(0.25, VPXMIN(4.0, twopass->bpm_factor)); +#endif + + if (target_rate <= 0) { + return rc->worst_quality; // Highest value allowed + } else { + const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE) + ? cpi->initial_mbs + : cpi->common.MBs; + const double active_pct = VPXMAX(0.01, 1.0 - inactive_zone); + const int active_mbs = (int)VPXMAX(1, (double)num_mbs * active_pct); + const double av_err_per_mb = section_err / active_pct; + const double speed_term = 1.0 + 0.04 * oxcf->speed; + const int target_norm_bits_per_mb = + (int)(((uint64_t)target_rate << BPER_MB_NORMBITS) / active_mbs); + int q; + +// TODO(jimbankoski): remove #if here or above when this has been +// well tested. +#if !CONFIG_ALWAYS_ADJUST_BPM + // based on recent history adjust expectations of bits per macroblock. + last_group_rate_err = + (double)twopass->rolling_arf_group_actual_bits / + DOUBLE_DIVIDE_CHECK((double)twopass->rolling_arf_group_target_bits); + last_group_rate_err = VPXMAX(0.25, VPXMIN(4.0, last_group_rate_err)); + twopass->bpm_factor *= (3.0 + last_group_rate_err) / 4.0; + twopass->bpm_factor = VPXMAX(0.25, VPXMIN(4.0, twopass->bpm_factor)); +#endif + + // Try and pick a max Q that will be high enough to encode the + // content at the given rate. + for (q = rc->best_quality; q < rc->worst_quality; ++q) { + const double factor = + calc_correction_factor(av_err_per_mb, wq_err_divisor(cpi), q); + const int bits_per_mb = vp9_rc_bits_per_mb( + INTER_FRAME, q, + factor * speed_term * cpi->twopass.bpm_factor * noise_factor, + cpi->common.bit_depth); + if (bits_per_mb <= target_norm_bits_per_mb) break; + } + + // Restriction on active max q for constrained quality mode. + if (cpi->oxcf.rc_mode == VPX_CQ) q = VPXMAX(q, oxcf->cq_level); + return q; + } +} + +static void setup_rf_level_maxq(VP9_COMP *cpi) { + int i; + RATE_CONTROL *const rc = &cpi->rc; + for (i = INTER_NORMAL; i < RATE_FACTOR_LEVELS; ++i) { + int qdelta = vp9_frame_type_qdelta(cpi, i, rc->worst_quality); + rc->rf_level_maxq[i] = VPXMAX(rc->worst_quality + qdelta, rc->best_quality); + } +} + +static void init_subsampling(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + const int w = cm->width; + const int h = cm->height; + int i; + + for (i = 0; i < FRAME_SCALE_STEPS; ++i) { + // Note: Frames with odd-sized dimensions may result from this scaling. + rc->frame_width[i] = (w * 16) / frame_scale_factor[i]; + rc->frame_height[i] = (h * 16) / frame_scale_factor[i]; + } + + setup_rf_level_maxq(cpi); +} + +void calculate_coded_size(VP9_COMP *cpi, int *scaled_frame_width, + int *scaled_frame_height) { + RATE_CONTROL *const rc = &cpi->rc; + *scaled_frame_width = rc->frame_width[rc->frame_size_selector]; + *scaled_frame_height = rc->frame_height[rc->frame_size_selector]; +} + +void vp9_init_second_pass(VP9_COMP *cpi) { + VP9EncoderConfig *const oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + TWO_PASS *const twopass = &cpi->twopass; + double frame_rate; + FIRSTPASS_STATS *stats; + + zero_stats(&twopass->total_stats); + zero_stats(&twopass->total_left_stats); + + if (!twopass->stats_in_end) return; + + stats = &twopass->total_stats; + + *stats = *twopass->stats_in_end; + twopass->total_left_stats = *stats; + + // Scan the first pass file and calculate a modified score for each + // frame that is used to distribute bits. The modified score is assumed + // to provide a linear basis for bit allocation. I.e., a frame A with a score + // that is double that of frame B will be allocated 2x as many bits. + { + double modified_score_total = 0.0; + const FIRSTPASS_STATS *s = twopass->stats_in; + double av_err; + + if (oxcf->vbr_corpus_complexity) { + twopass->mean_mod_score = (double)oxcf->vbr_corpus_complexity / 10.0; + av_err = get_distribution_av_err(cpi, twopass); + } else { + av_err = get_distribution_av_err(cpi, twopass); + // The first scan is unclamped and gives a raw average. + while (s < twopass->stats_in_end) { + modified_score_total += calculate_mod_frame_score(cpi, oxcf, s, av_err); + ++s; + } + + // The average error from this first scan is used to define the midpoint + // error for the rate distribution function. + twopass->mean_mod_score = + modified_score_total / DOUBLE_DIVIDE_CHECK(stats->count); + } + + // Second scan using clamps based on the previous cycle average. + // This may modify the total and average somewhat but we don't bother with + // further iterations. + modified_score_total = 0.0; + s = twopass->stats_in; + while (s < twopass->stats_in_end) { + modified_score_total += + calculate_norm_frame_score(cpi, twopass, oxcf, s, av_err); + ++s; + } + twopass->normalized_score_left = modified_score_total; + + // If using Corpus wide VBR mode then update the clip target bandwidth to + // reflect how the clip compares to the rest of the corpus. + if (oxcf->vbr_corpus_complexity) { + oxcf->target_bandwidth = + (int64_t)((double)oxcf->target_bandwidth * + (twopass->normalized_score_left / stats->count)); + } + +#if COMPLEXITY_STATS_OUTPUT + { + FILE *compstats; + compstats = fopen("complexity_stats.stt", "a"); + fprintf(compstats, "%10.3lf\n", + twopass->normalized_score_left / stats->count); + fclose(compstats); + } +#endif + } + + frame_rate = 10000000.0 * stats->count / stats->duration; + // Each frame can have a different duration, as the frame rate in the source + // isn't guaranteed to be constant. The frame rate prior to the first frame + // encoded in the second pass is a guess. However, the sum duration is not. + // It is calculated based on the actual durations of all frames from the + // first pass. + vp9_new_framerate(cpi, frame_rate); + twopass->bits_left = + (int64_t)(stats->duration * oxcf->target_bandwidth / 10000000.0); + + // This variable monitors how far behind the second ref update is lagging. + twopass->sr_update_lag = 1; + + // Reset the vbr bits off target counters + rc->vbr_bits_off_target = 0; + rc->vbr_bits_off_target_fast = 0; + rc->rate_error_estimate = 0; + + // Static sequence monitor variables. + twopass->kf_zeromotion_pct = 100; + twopass->last_kfgroup_zeromotion_pct = 100; + + // Initialize bits per macro_block estimate correction factor. + twopass->bpm_factor = 1.0; + // Initialize actual and target bits counters for ARF groups so that + // at the start we have a neutral bpm adjustment. + twopass->rolling_arf_group_target_bits = 1; + twopass->rolling_arf_group_actual_bits = 1; + + if (oxcf->resize_mode != RESIZE_NONE) { + init_subsampling(cpi); + } + + // Initialize the arnr strangth adjustment to 0 + twopass->arnr_strength_adjustment = 0; +} + +/* This function considers how the quality of prediction may be deteriorating + * with distance. It compares the coded error for the last frame and the + * second reference frame (usually two frames old) and also applies a factor + * based on the extent of INTRA coding. + * + * The decay factor is then used to reduce the contribution of frames further + * from the alt-ref or golden frame, to the bitrate boost calculation for that + * alt-ref or golden frame. + */ +static double get_sr_decay_rate(const TWO_PASS *const twopass, + const FIRSTPASS_STATS *frame) { + double sr_diff = (frame->sr_coded_error - frame->coded_error); + double sr_decay = 1.0; + + // Do nothing if the second ref to last frame error difference is + // very small or even negative. + if ((sr_diff > LOW_SR_DIFF_TRHESH)) { + const double sr_diff_part = + twopass->sr_diff_factor * ((sr_diff * 0.25) / frame->intra_error); + double modified_pct_inter = frame->pcnt_inter; + double modified_pcnt_intra; + + if ((frame->coded_error > LOW_CODED_ERR_PER_MB) && + ((frame->intra_error / DOUBLE_DIVIDE_CHECK(frame->coded_error)) < + (double)NCOUNT_FRAME_II_THRESH)) { + modified_pct_inter = + frame->pcnt_inter + frame->pcnt_intra_low - frame->pcnt_neutral; + } + modified_pcnt_intra = 100 * (1.0 - modified_pct_inter); + + sr_decay = 1.0 - sr_diff_part - (INTRA_PART * modified_pcnt_intra); + } + return VPXMAX(sr_decay, twopass->sr_default_decay_limit); +} + +// This function gives an estimate of how badly we believe the prediction +// quality is decaying from frame to frame. +static double get_zero_motion_factor(const TWO_PASS *const twopass, + const FIRSTPASS_STATS *frame_stats) { + const double zero_motion_pct = + frame_stats->pcnt_inter - frame_stats->pcnt_motion; + double sr_decay = get_sr_decay_rate(twopass, frame_stats); + return VPXMIN(sr_decay, zero_motion_pct); +} + +static double get_prediction_decay_rate(const TWO_PASS *const twopass, + const FIRSTPASS_STATS *frame_stats) { + const double sr_decay_rate = get_sr_decay_rate(twopass, frame_stats); + double zero_motion_factor = + twopass->zm_factor * (frame_stats->pcnt_inter - frame_stats->pcnt_motion); + + // Check that the zero motion factor is valid + assert(zero_motion_factor >= 0.0 && zero_motion_factor <= 1.0); + + return VPXMAX(zero_motion_factor, + (sr_decay_rate + ((1.0 - sr_decay_rate) * zero_motion_factor))); +} + +static int get_show_idx(const TWO_PASS *twopass) { + return (int)(twopass->stats_in - twopass->stats_in_start); +} +// Function to test for a condition where a complex transition is followed +// by a static section. For example in slide shows where there is a fade +// between slides. This is to help with more optimal kf and gf positioning. +static int check_transition_to_still(const FIRST_PASS_INFO *first_pass_info, + int show_idx, int still_interval) { + int j; + int num_frames = fps_get_num_frames(first_pass_info); + if (show_idx + still_interval > num_frames) { + return 0; + } + + // Look ahead a few frames to see if static condition persists... + for (j = 0; j < still_interval; ++j) { + const FIRSTPASS_STATS *stats = + fps_get_frame_stats(first_pass_info, show_idx + j); + if (stats->pcnt_inter - stats->pcnt_motion < 0.999) break; + } + + // Only if it does do we signal a transition to still. + return j == still_interval; +} + +// This function detects a flash through the high relative pcnt_second_ref +// score in the frame following a flash frame. The offset passed in should +// reflect this. +static int detect_flash_from_frame_stats(const FIRSTPASS_STATS *frame_stats) { + // What we are looking for here is a situation where there is a + // brief break in prediction (such as a flash) but subsequent frames + // are reasonably well predicted by an earlier (pre flash) frame. + // The recovery after a flash is indicated by a high pcnt_second_ref + // usage or a second ref coded error notabley lower than the last + // frame coded error. + if (frame_stats == NULL) { + return 0; + } + return (frame_stats->sr_coded_error < frame_stats->coded_error) || + ((frame_stats->pcnt_second_ref > frame_stats->pcnt_inter) && + (frame_stats->pcnt_second_ref >= 0.5)); +} + +static int detect_flash(const TWO_PASS *twopass, int offset) { + const FIRSTPASS_STATS *const next_frame = read_frame_stats(twopass, offset); + return detect_flash_from_frame_stats(next_frame); +} + +// Update the motion related elements to the GF arf boost calculation. +static void accumulate_frame_motion_stats(const FIRSTPASS_STATS *stats, + double *mv_in_out, + double *mv_in_out_accumulator, + double *abs_mv_in_out_accumulator, + double *mv_ratio_accumulator) { + const double pct = stats->pcnt_motion; + + // Accumulate Motion In/Out of frame stats. + *mv_in_out = stats->mv_in_out_count * pct; + *mv_in_out_accumulator += *mv_in_out; + *abs_mv_in_out_accumulator += fabs(*mv_in_out); + + // Accumulate a measure of how uniform (or conversely how random) the motion + // field is (a ratio of abs(mv) / mv). + if (pct > 0.05) { + const double mvr_ratio = + fabs(stats->mvr_abs) / DOUBLE_DIVIDE_CHECK(fabs(stats->MVr)); + const double mvc_ratio = + fabs(stats->mvc_abs) / DOUBLE_DIVIDE_CHECK(fabs(stats->MVc)); + + *mv_ratio_accumulator += + pct * (mvr_ratio < stats->mvr_abs ? mvr_ratio : stats->mvr_abs); + *mv_ratio_accumulator += + pct * (mvc_ratio < stats->mvc_abs ? mvc_ratio : stats->mvc_abs); + } +} + +static double calc_frame_boost(const FRAME_INFO *frame_info, + const FIRSTPASS_STATS *this_frame, + const TWO_PASS *const twopass, + int avg_frame_qindex, + double this_frame_mv_in_out) { + double frame_boost; + const double lq = + vp9_convert_qindex_to_q(avg_frame_qindex, frame_info->bit_depth); + const double boost_q_correction = VPXMIN((0.5 + (lq * 0.015)), 1.5); + const double active_area = calculate_active_area(frame_info, this_frame); + + // Frame booost is based on inter error. + frame_boost = (twopass->err_per_mb * active_area) / + DOUBLE_DIVIDE_CHECK(this_frame->coded_error); + + // Small adjustment for cases where there is a zoom out + if (this_frame_mv_in_out > 0.0) + frame_boost += frame_boost * (this_frame_mv_in_out * 2.0); + + // Q correction and scalling + frame_boost = frame_boost * boost_q_correction; + + return VPXMIN(frame_boost, twopass->gf_frame_max_boost * boost_q_correction); +} + +static double calc_kf_frame_boost(VP9_COMP *cpi, + const FIRSTPASS_STATS *this_frame, + double *sr_accumulator, + double this_frame_mv_in_out, + double zm_factor) { + TWO_PASS *const twopass = &cpi->twopass; + double frame_boost; + const double lq = vp9_convert_qindex_to_q( + cpi->rc.avg_frame_qindex[INTER_FRAME], cpi->common.bit_depth); + const double boost_q_correction = VPXMIN((0.50 + (lq * 0.015)), 2.00); + const double active_area = + calculate_active_area(&cpi->frame_info, this_frame); + double max_boost; + + // Frame booost is based on inter error. + frame_boost = (twopass->kf_err_per_mb * active_area) / + DOUBLE_DIVIDE_CHECK(this_frame->coded_error + *sr_accumulator); + + // Update the accumulator for second ref error difference. + // This is intended to give an indication of how much the coded error is + // increasing over time. + *sr_accumulator += (this_frame->sr_coded_error - this_frame->coded_error); + *sr_accumulator = VPXMAX(0.0, *sr_accumulator); + + // Small adjustment for cases where there is a zoom out + if (this_frame_mv_in_out > 0.0) + frame_boost += frame_boost * (this_frame_mv_in_out * 2.0); + + // Q correction and scaling + // The 40.0 value here is an experimentally derived baseline minimum. + // This value is in line with the minimum per frame boost in the alt_ref + // boost calculation. + frame_boost = + (frame_boost + twopass->kf_frame_min_boost) * boost_q_correction; + + // Maximum allowed boost this frame. May be different for first vs subsequent + // key frames. + max_boost = (cpi->common.current_video_frame == 0) + ? twopass->kf_frame_max_boost_first + : twopass->kf_frame_max_boost_subs; + max_boost *= zm_factor * boost_q_correction; + + return VPXMIN(frame_boost, max_boost); +} + +static int compute_arf_boost(const FRAME_INFO *frame_info, + TWO_PASS *const twopass, int arf_show_idx, + int f_frames, int b_frames, int avg_frame_qindex) { + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + int i; + double boost_score = 0.0; + double mv_ratio_accumulator = 0.0; + double decay_accumulator = 1.0; + double this_frame_mv_in_out = 0.0; + double mv_in_out_accumulator = 0.0; + double abs_mv_in_out_accumulator = 0.0; + int arf_boost; + int flash_detected = 0; + + // Search forward from the proposed arf/next gf position. + for (i = 0; i < f_frames; ++i) { + const FIRSTPASS_STATS *this_frame = + fps_get_frame_stats(first_pass_info, arf_show_idx + i); + const FIRSTPASS_STATS *next_frame = + fps_get_frame_stats(first_pass_info, arf_show_idx + i + 1); + if (this_frame == NULL) break; + + // Update the motion related elements to the boost calculation. + accumulate_frame_motion_stats( + this_frame, &this_frame_mv_in_out, &mv_in_out_accumulator, + &abs_mv_in_out_accumulator, &mv_ratio_accumulator); + + // We want to discount the flash frame itself and the recovery + // frame that follows as both will have poor scores. + flash_detected = detect_flash_from_frame_stats(this_frame) || + detect_flash_from_frame_stats(next_frame); + + // Accumulate the effect of prediction quality decay. + if (!flash_detected) { + decay_accumulator *= get_prediction_decay_rate(twopass, this_frame); + decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR + ? MIN_DECAY_FACTOR + : decay_accumulator; + } + boost_score += decay_accumulator * + calc_frame_boost(frame_info, this_frame, twopass, + avg_frame_qindex, this_frame_mv_in_out); + } + + arf_boost = (int)boost_score; + + // Reset for backward looking loop. + boost_score = 0.0; + mv_ratio_accumulator = 0.0; + decay_accumulator = 1.0; + this_frame_mv_in_out = 0.0; + mv_in_out_accumulator = 0.0; + abs_mv_in_out_accumulator = 0.0; + + // Search backward towards last gf position. + for (i = -1; i >= -b_frames; --i) { + const FIRSTPASS_STATS *this_frame = + fps_get_frame_stats(first_pass_info, arf_show_idx + i); + const FIRSTPASS_STATS *next_frame = + fps_get_frame_stats(first_pass_info, arf_show_idx + i + 1); + if (this_frame == NULL) break; + + // Update the motion related elements to the boost calculation. + accumulate_frame_motion_stats( + this_frame, &this_frame_mv_in_out, &mv_in_out_accumulator, + &abs_mv_in_out_accumulator, &mv_ratio_accumulator); + + // We want to discount the flash frame itself and the recovery + // frame that follows as both will have poor scores. + flash_detected = detect_flash_from_frame_stats(this_frame) || + detect_flash_from_frame_stats(next_frame); + + // Cumulative effect of prediction quality decay. + if (!flash_detected) { + decay_accumulator *= get_prediction_decay_rate(twopass, this_frame); + decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR + ? MIN_DECAY_FACTOR + : decay_accumulator; + } + boost_score += decay_accumulator * + calc_frame_boost(frame_info, this_frame, twopass, + avg_frame_qindex, this_frame_mv_in_out); + } + arf_boost += (int)boost_score; + + if (arf_boost < ((b_frames + f_frames) * 40)) + arf_boost = ((b_frames + f_frames) * 40); + arf_boost = VPXMAX(arf_boost, MIN_ARF_GF_BOOST); + + return arf_boost; +} + +static int calc_arf_boost(VP9_COMP *cpi, int f_frames, int b_frames) { + const FRAME_INFO *frame_info = &cpi->frame_info; + TWO_PASS *const twopass = &cpi->twopass; + const int avg_inter_frame_qindex = cpi->rc.avg_frame_qindex[INTER_FRAME]; + int arf_show_idx = get_show_idx(twopass); + return compute_arf_boost(frame_info, twopass, arf_show_idx, f_frames, + b_frames, avg_inter_frame_qindex); +} + +// Calculate a section intra ratio used in setting max loop filter. +static int calculate_section_intra_ratio(const FIRSTPASS_STATS *begin, + const FIRSTPASS_STATS *end, + int section_length) { + const FIRSTPASS_STATS *s = begin; + double intra_error = 0.0; + double coded_error = 0.0; + int i = 0; + + while (s < end && i < section_length) { + intra_error += s->intra_error; + coded_error += s->coded_error; + ++s; + ++i; + } + + return (int)(intra_error / DOUBLE_DIVIDE_CHECK(coded_error)); +} + +// Calculate the total bits to allocate in this GF/ARF group. +static int64_t calculate_total_gf_group_bits(VP9_COMP *cpi, + double gf_group_err) { + VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + const TWO_PASS *const twopass = &cpi->twopass; + const int max_bits = frame_max_bits(rc, &cpi->oxcf); + int64_t total_group_bits; + const int is_key_frame = frame_is_intra_only(cm); + const int arf_active_or_kf = is_key_frame || rc->source_alt_ref_active; + int gop_frames = + rc->baseline_gf_interval + rc->source_alt_ref_pending - arf_active_or_kf; + + // Calculate the bits to be allocated to the group as a whole. + if ((twopass->kf_group_bits > 0) && (twopass->kf_group_error_left > 0.0)) { + int key_frame_interval = rc->frames_since_key + rc->frames_to_key; + int distance_from_next_key_frame = + rc->frames_to_key - + (rc->baseline_gf_interval + rc->source_alt_ref_pending); + int max_gf_bits_bias = rc->avg_frame_bandwidth; + double gf_interval_bias_bits_normalize_factor = + (double)rc->baseline_gf_interval / 16; + total_group_bits = (int64_t)(twopass->kf_group_bits * + (gf_group_err / twopass->kf_group_error_left)); + // TODO(ravi): Experiment with different values of max_gf_bits_bias + total_group_bits += + (int64_t)((double)distance_from_next_key_frame / key_frame_interval * + max_gf_bits_bias * gf_interval_bias_bits_normalize_factor); + } else { + total_group_bits = 0; + } + + // Clamp odd edge cases. + total_group_bits = (total_group_bits < 0) ? 0 + : (total_group_bits > twopass->kf_group_bits) + ? twopass->kf_group_bits + : total_group_bits; + + // Clip based on user supplied data rate variability limit. + if (total_group_bits > (int64_t)max_bits * gop_frames) + total_group_bits = (int64_t)max_bits * gop_frames; + + return total_group_bits; +} + +// Calculate the number bits extra to assign to boosted frames in a group. +static int calculate_boost_bits(int frame_count, int boost, + int64_t total_group_bits) { + int allocation_chunks; + + // return 0 for invalid inputs (could arise e.g. through rounding errors) + if (!boost || (total_group_bits <= 0) || (frame_count < 0)) return 0; + + allocation_chunks = (frame_count * NORMAL_BOOST) + boost; + + // Prevent overflow. + if (boost > 1023) { + int divisor = boost >> 10; + boost /= divisor; + allocation_chunks /= divisor; + } + + // Calculate the number of extra bits for use in the boosted frame or frames. + return VPXMAX((int)(((int64_t)boost * total_group_bits) / allocation_chunks), + 0); +} + +// Used in corpus vbr: Calculates the total normalized group complexity score +// for a given number of frames starting at the current position in the stats +// file. +static double calculate_group_score(VP9_COMP *cpi, double av_score, + int frame_count) { + VP9EncoderConfig *const oxcf = &cpi->oxcf; + TWO_PASS *const twopass = &cpi->twopass; + const FIRSTPASS_STATS *s = twopass->stats_in; + double score_total = 0.0; + int i = 0; + + // We don't ever want to return a 0 score here. + if (frame_count == 0) return 1.0; + + while ((i < frame_count) && (s < twopass->stats_in_end)) { + score_total += calculate_norm_frame_score(cpi, twopass, oxcf, s, av_score); + ++s; + ++i; + } + + return score_total; +} + +static void find_arf_order(VP9_COMP *cpi, GF_GROUP *gf_group, + int *index_counter, int depth, int start, int end) { + TWO_PASS *twopass = &cpi->twopass; + const FIRSTPASS_STATS *const start_pos = twopass->stats_in; + FIRSTPASS_STATS fpf_frame; + const int mid = (start + end + 1) >> 1; + const int min_frame_interval = 2; + int idx; + + // Process regular P frames + if ((end - start < min_frame_interval) || + (depth > gf_group->allowed_max_layer_depth)) { + for (idx = start; idx <= end; ++idx) { + gf_group->update_type[*index_counter] = LF_UPDATE; + gf_group->arf_src_offset[*index_counter] = 0; + gf_group->frame_gop_index[*index_counter] = idx; + gf_group->rf_level[*index_counter] = INTER_NORMAL; + gf_group->layer_depth[*index_counter] = depth; + gf_group->gfu_boost[*index_counter] = NORMAL_BOOST; + ++(*index_counter); + } + gf_group->max_layer_depth = VPXMAX(gf_group->max_layer_depth, depth); + return; + } + + assert(abs(mid - start) >= 1 && abs(mid - end) >= 1); + + // Process ARF frame + gf_group->layer_depth[*index_counter] = depth; + gf_group->update_type[*index_counter] = ARF_UPDATE; + gf_group->arf_src_offset[*index_counter] = mid - start; + gf_group->frame_gop_index[*index_counter] = mid; + gf_group->rf_level[*index_counter] = GF_ARF_LOW; + + for (idx = 0; idx <= mid; ++idx) + if (EOF == input_stats(twopass, &fpf_frame)) break; + + gf_group->gfu_boost[*index_counter] = + VPXMAX(MIN_ARF_GF_BOOST, + calc_arf_boost(cpi, end - mid + 1, mid - start) >> depth); + + reset_fpf_position(twopass, start_pos); + + ++(*index_counter); + + find_arf_order(cpi, gf_group, index_counter, depth + 1, start, mid - 1); + + gf_group->update_type[*index_counter] = USE_BUF_FRAME; + gf_group->arf_src_offset[*index_counter] = 0; + gf_group->frame_gop_index[*index_counter] = mid; + gf_group->rf_level[*index_counter] = INTER_NORMAL; + gf_group->layer_depth[*index_counter] = depth; + ++(*index_counter); + + find_arf_order(cpi, gf_group, index_counter, depth + 1, mid + 1, end); +} + +static INLINE void set_gf_overlay_frame_type(GF_GROUP *gf_group, + int frame_index, + int source_alt_ref_active) { + if (source_alt_ref_active) { + gf_group->update_type[frame_index] = OVERLAY_UPDATE; + gf_group->rf_level[frame_index] = INTER_NORMAL; + gf_group->layer_depth[frame_index] = MAX_ARF_LAYERS - 1; + gf_group->gfu_boost[frame_index] = NORMAL_BOOST; + } else { + gf_group->update_type[frame_index] = GF_UPDATE; + gf_group->rf_level[frame_index] = GF_ARF_STD; + gf_group->layer_depth[frame_index] = 0; + } +} + +static void define_gf_group_structure(VP9_COMP *cpi) { + RATE_CONTROL *const rc = &cpi->rc; + TWO_PASS *const twopass = &cpi->twopass; + GF_GROUP *const gf_group = &twopass->gf_group; + int frame_index = 0; + int key_frame = cpi->common.frame_type == KEY_FRAME; + int layer_depth = 1; + int gop_frames = + rc->baseline_gf_interval - (key_frame || rc->source_alt_ref_pending); + + gf_group->frame_start = cpi->common.current_video_frame; + gf_group->frame_end = gf_group->frame_start + rc->baseline_gf_interval; + gf_group->max_layer_depth = 0; + gf_group->allowed_max_layer_depth = 0; + + // For key frames the frame target rate is already set and it + // is also the golden frame. + // === [frame_index == 0] === + if (!key_frame) + set_gf_overlay_frame_type(gf_group, frame_index, rc->source_alt_ref_active); + + ++frame_index; + + // === [frame_index == 1] === + if (rc->source_alt_ref_pending) { + gf_group->update_type[frame_index] = ARF_UPDATE; + gf_group->rf_level[frame_index] = GF_ARF_STD; + gf_group->layer_depth[frame_index] = layer_depth; + gf_group->arf_src_offset[frame_index] = + (unsigned char)(rc->baseline_gf_interval - 1); + gf_group->frame_gop_index[frame_index] = rc->baseline_gf_interval; + gf_group->max_layer_depth = 1; + ++frame_index; + ++layer_depth; + gf_group->allowed_max_layer_depth = cpi->oxcf.enable_auto_arf; + } + + find_arf_order(cpi, gf_group, &frame_index, layer_depth, 1, gop_frames); + + set_gf_overlay_frame_type(gf_group, frame_index, rc->source_alt_ref_pending); + gf_group->arf_src_offset[frame_index] = 0; + gf_group->frame_gop_index[frame_index] = rc->baseline_gf_interval; + + // Set the frame ops number. + gf_group->gf_group_size = frame_index; +} + +static void allocate_gf_group_bits(VP9_COMP *cpi, int64_t gf_group_bits, + int gf_arf_bits) { + VP9EncoderConfig *const oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + TWO_PASS *const twopass = &cpi->twopass; + GF_GROUP *const gf_group = &twopass->gf_group; + FIRSTPASS_STATS frame_stats; + int i; + int frame_index = 0; + int target_frame_size; + int key_frame; + const int max_bits = frame_max_bits(&cpi->rc, oxcf); + int64_t total_group_bits = gf_group_bits; + int mid_frame_idx; + int normal_frames; + int normal_frame_bits; + int last_frame_reduction = 0; + double av_score = 1.0; + double tot_norm_frame_score = 1.0; + double this_frame_score = 1.0; + + // Define the GF structure and specify + int gop_frames = gf_group->gf_group_size; + + key_frame = cpi->common.frame_type == KEY_FRAME; + + // For key frames the frame target rate is already set and it + // is also the golden frame. + // === [frame_index == 0] === + if (!key_frame) { + gf_group->bit_allocation[frame_index] = + rc->source_alt_ref_active ? 0 : gf_arf_bits; + } + + // Deduct the boost bits for arf (or gf if it is not a key frame) + // from the group total. + if (rc->source_alt_ref_pending || !key_frame) total_group_bits -= gf_arf_bits; + + ++frame_index; + + // === [frame_index == 1] === + // Store the bits to spend on the ARF if there is one. + if (rc->source_alt_ref_pending) { + gf_group->bit_allocation[frame_index] = gf_arf_bits; + + ++frame_index; + } + + // Define middle frame + mid_frame_idx = frame_index + (rc->baseline_gf_interval >> 1) - 1; + + normal_frames = (rc->baseline_gf_interval - 1); + if (normal_frames > 1) + normal_frame_bits = (int)(total_group_bits / normal_frames); + else + normal_frame_bits = (int)total_group_bits; + + gf_group->gfu_boost[1] = rc->gfu_boost; + + if (cpi->multi_layer_arf) { + int idx; + int arf_depth_bits[MAX_ARF_LAYERS] = { 0 }; + int arf_depth_count[MAX_ARF_LAYERS] = { 0 }; + int arf_depth_boost[MAX_ARF_LAYERS] = { 0 }; + int total_arfs = 1; // Account for the base layer ARF. + + for (idx = 0; idx < gop_frames; ++idx) { + if (gf_group->update_type[idx] == ARF_UPDATE) { + arf_depth_boost[gf_group->layer_depth[idx]] += gf_group->gfu_boost[idx]; + ++arf_depth_count[gf_group->layer_depth[idx]]; + } + } + + for (idx = 2; idx < MAX_ARF_LAYERS; ++idx) { + if (arf_depth_boost[idx] == 0) break; + arf_depth_bits[idx] = calculate_boost_bits( + rc->baseline_gf_interval - total_arfs - arf_depth_count[idx], + arf_depth_boost[idx], total_group_bits); + + total_group_bits -= arf_depth_bits[idx]; + total_arfs += arf_depth_count[idx]; + } + + // offset the base layer arf + normal_frames -= (total_arfs - 1); + if (normal_frames > 1) + normal_frame_bits = (int)(total_group_bits / normal_frames); + else + normal_frame_bits = (int)total_group_bits; + + target_frame_size = normal_frame_bits; + target_frame_size = + clamp(target_frame_size, 0, VPXMIN(max_bits, (int)total_group_bits)); + + // The first layer ARF has its bit allocation assigned. + for (idx = frame_index; idx < gop_frames; ++idx) { + switch (gf_group->update_type[idx]) { + case ARF_UPDATE: + gf_group->bit_allocation[idx] = + (int)(((int64_t)arf_depth_bits[gf_group->layer_depth[idx]] * + gf_group->gfu_boost[idx]) / + arf_depth_boost[gf_group->layer_depth[idx]]); + break; + case USE_BUF_FRAME: gf_group->bit_allocation[idx] = 0; break; + default: gf_group->bit_allocation[idx] = target_frame_size; break; + } + } + gf_group->bit_allocation[idx] = 0; + + return; + } + + if (oxcf->vbr_corpus_complexity) { + av_score = get_distribution_av_err(cpi, twopass); + tot_norm_frame_score = calculate_group_score(cpi, av_score, normal_frames); + } + + // Allocate bits to the other frames in the group. + for (i = 0; i < normal_frames; ++i) { + if (EOF == input_stats(twopass, &frame_stats)) break; + if (oxcf->vbr_corpus_complexity) { + this_frame_score = calculate_norm_frame_score(cpi, twopass, oxcf, + &frame_stats, av_score); + normal_frame_bits = (int)((double)total_group_bits * + (this_frame_score / tot_norm_frame_score)); + } + + target_frame_size = normal_frame_bits; + if ((i == (normal_frames - 1)) && (i >= 1)) { + last_frame_reduction = normal_frame_bits / 16; + target_frame_size -= last_frame_reduction; + } + + target_frame_size = + clamp(target_frame_size, 0, VPXMIN(max_bits, (int)total_group_bits)); + + gf_group->bit_allocation[frame_index] = target_frame_size; + ++frame_index; + } + + // Add in some extra bits for the middle frame in the group. + gf_group->bit_allocation[mid_frame_idx] += last_frame_reduction; + + // Note: + // We need to configure the frame at the end of the sequence + 1 that will be + // the start frame for the next group. Otherwise prior to the call to + // vp9_rc_get_second_pass_params() the data will be undefined. +} + +// Adjusts the ARNF filter for a GF group. +static void adjust_group_arnr_filter(VP9_COMP *cpi, double section_noise, + double section_inter, + double section_motion) { + TWO_PASS *const twopass = &cpi->twopass; + double section_zeromv = section_inter - section_motion; + + twopass->arnr_strength_adjustment = 0; + + if (section_noise < 150) { + twopass->arnr_strength_adjustment -= 1; + if (section_noise < 75) twopass->arnr_strength_adjustment -= 1; + } else if (section_noise > 250) + twopass->arnr_strength_adjustment += 1; + + if (section_zeromv > 0.50) twopass->arnr_strength_adjustment += 1; +} + +// Analyse and define a gf/arf group. +#define ARF_ABS_ZOOM_THRESH 4.0 + +#define MAX_GF_BOOST 5400 + +typedef struct RANGE { + int min; + int max; +} RANGE; + +/* get_gop_coding_frame_num() depends on several fields in RATE_CONTROL *rc as + * follows. + * Static fields: + * (The following fields will remain unchanged after initialization of encoder.) + * rc->static_scene_max_gf_interval + * rc->min_gf_interval + * twopass->sr_diff_factor + * twopass->sr_default_decay_limit + * twopass->zm_factor + * + * Dynamic fields: + * (The following fields will be updated before or after coding each frame.) + * rc->frames_to_key + * rc->frames_since_key + * rc->source_alt_ref_active + * + * Special case: if CONFIG_RATE_CTRL is true, the external arf indexes will + * determine the arf position. + * + * TODO(angiebird): Separate the dynamic fields and static fields into two + * structs. + */ +static int get_gop_coding_frame_num( + int *use_alt_ref, const FRAME_INFO *frame_info, + const TWO_PASS *const twopass, const RATE_CONTROL *rc, + int gf_start_show_idx, const RANGE *active_gf_interval, + double gop_intra_factor, int lag_in_frames, int *end_of_sequence) { + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + double loop_decay_rate = 1.00; + double mv_ratio_accumulator = 0.0; + double this_frame_mv_in_out = 0.0; + double mv_in_out_accumulator = 0.0; + double abs_mv_in_out_accumulator = 0.0; + double sr_accumulator = 0.0; + // Motion breakout threshold for loop below depends on image size. + double mv_ratio_accumulator_thresh = + (frame_info->frame_height + frame_info->frame_width) / 4.0; + double zero_motion_accumulator = 1.0; + int gop_coding_frames; + + *use_alt_ref = 1; + gop_coding_frames = 0; + while (gop_coding_frames < rc->static_scene_max_gf_interval && + gop_coding_frames < rc->frames_to_key) { + const FIRSTPASS_STATS *next_next_frame; + const FIRSTPASS_STATS *next_frame; + int flash_detected; + ++gop_coding_frames; + + next_frame = fps_get_frame_stats(first_pass_info, + gf_start_show_idx + gop_coding_frames); + if (next_frame == NULL) { + *end_of_sequence = gop_coding_frames == 1 && rc->source_alt_ref_active; + break; + } + + // Test for the case where there is a brief flash but the prediction + // quality back to an earlier frame is then restored. + next_next_frame = fps_get_frame_stats( + first_pass_info, gf_start_show_idx + gop_coding_frames + 1); + flash_detected = detect_flash_from_frame_stats(next_next_frame); + + // Update the motion related elements to the boost calculation. + accumulate_frame_motion_stats( + next_frame, &this_frame_mv_in_out, &mv_in_out_accumulator, + &abs_mv_in_out_accumulator, &mv_ratio_accumulator); + + // Monitor for static sections. + if ((rc->frames_since_key + gop_coding_frames - 1) > 1) { + zero_motion_accumulator = VPXMIN( + zero_motion_accumulator, get_zero_motion_factor(twopass, next_frame)); + } + + // Accumulate the effect of prediction quality decay. + if (!flash_detected) { + double last_loop_decay_rate = loop_decay_rate; + loop_decay_rate = get_prediction_decay_rate(twopass, next_frame); + + // Break clause to detect very still sections after motion. For example, + // a static image after a fade or other transition. + if (gop_coding_frames > rc->min_gf_interval && loop_decay_rate >= 0.999 && + last_loop_decay_rate < 0.9) { + int still_interval = 5; + if (check_transition_to_still(first_pass_info, + gf_start_show_idx + gop_coding_frames, + still_interval)) { + *use_alt_ref = 0; + break; + } + } + + // Update the accumulator for second ref error difference. + // This is intended to give an indication of how much the coded error is + // increasing over time. + if (gop_coding_frames == 1) { + sr_accumulator += next_frame->coded_error; + } else { + sr_accumulator += + (next_frame->sr_coded_error - next_frame->coded_error); + } + } + + // Break out conditions. + // Break at maximum of active_gf_interval->max unless almost totally + // static. + // + // Note that the addition of a test of rc->source_alt_ref_active is + // deliberate. The effect of this is that after a normal altref group even + // if the material is static there will be one normal length GF group + // before allowing longer GF groups. The reason for this is that in cases + // such as slide shows where slides are separated by a complex transition + // such as a fade, the arf group spanning the transition may not be coded + // at a very high quality and hence this frame (with its overlay) is a + // poor golden frame to use for an extended group. + if ((gop_coding_frames >= active_gf_interval->max) && + ((zero_motion_accumulator < 0.995) || (rc->source_alt_ref_active))) { + break; + } + if ( + // Don't break out with a very short interval. + (gop_coding_frames >= active_gf_interval->min) && + // If possible don't break very close to a kf + ((rc->frames_to_key - gop_coding_frames) >= rc->min_gf_interval) && + (gop_coding_frames & 0x01) && (!flash_detected) && + ((mv_ratio_accumulator > mv_ratio_accumulator_thresh) || + (abs_mv_in_out_accumulator > ARF_ABS_ZOOM_THRESH) || + (sr_accumulator > gop_intra_factor * next_frame->intra_error))) { + break; + } + } + *use_alt_ref &= zero_motion_accumulator < 0.995; + *use_alt_ref &= gop_coding_frames < lag_in_frames; + *use_alt_ref &= gop_coding_frames >= rc->min_gf_interval; + return gop_coding_frames; +} + +static RANGE get_active_gf_inverval_range_simple(int min_gf_interval, + int arf_active_or_kf, + int frames_to_key) { + RANGE active_gf_interval; + active_gf_interval.min = min_gf_interval + arf_active_or_kf + 2; + active_gf_interval.max = 16 + arf_active_or_kf; + + if ((active_gf_interval.max <= frames_to_key) && + (active_gf_interval.max >= (frames_to_key - min_gf_interval))) { + active_gf_interval.min = frames_to_key / 2; + active_gf_interval.max = frames_to_key / 2; + } + return active_gf_interval; +} + +static RANGE get_active_gf_inverval_range( + const FRAME_INFO *frame_info, const RATE_CONTROL *rc, int arf_active_or_kf, + int gf_start_show_idx, int active_worst_quality, int last_boosted_qindex) { + RANGE active_gf_interval; + int int_max_q = (int)(vp9_convert_qindex_to_q(active_worst_quality, + frame_info->bit_depth)); + int q_term = (gf_start_show_idx == 0) + ? int_max_q / 32 + : (int)(vp9_convert_qindex_to_q(last_boosted_qindex, + frame_info->bit_depth) / + 6); + active_gf_interval.min = + rc->min_gf_interval + arf_active_or_kf + VPXMIN(2, int_max_q / 200); + active_gf_interval.min = + VPXMIN(active_gf_interval.min, rc->max_gf_interval + arf_active_or_kf); + + // The value chosen depends on the active Q range. At low Q we have + // bits to spare and are better with a smaller interval and smaller boost. + // At high Q when there are few bits to spare we are better with a longer + // interval to spread the cost of the GF. + active_gf_interval.max = 11 + arf_active_or_kf + VPXMIN(5, q_term); + + // Force max GF interval to be odd. + active_gf_interval.max = active_gf_interval.max | 0x01; + + // We have: active_gf_interval.min <= + // rc->max_gf_interval + arf_active_or_kf. + if (active_gf_interval.max < active_gf_interval.min) { + active_gf_interval.max = active_gf_interval.min; + } else { + active_gf_interval.max = + VPXMIN(active_gf_interval.max, rc->max_gf_interval + arf_active_or_kf); + } + + // Would the active max drop us out just before the near the next kf? + if ((active_gf_interval.max <= rc->frames_to_key) && + (active_gf_interval.max >= (rc->frames_to_key - rc->min_gf_interval))) { + active_gf_interval.max = rc->frames_to_key / 2; + } + active_gf_interval.max = + VPXMAX(active_gf_interval.max, active_gf_interval.min); + return active_gf_interval; +} + +static int get_arf_layers(int multi_layer_arf, int max_layers, + int coding_frame_num) { + assert(max_layers <= MAX_ARF_LAYERS); + if (multi_layer_arf) { + int layers = 0; + int i; + for (i = coding_frame_num; i > 0; i >>= 1) { + ++layers; + } + layers = VPXMIN(max_layers, layers); + return layers; + } else { + return 1; + } +} + +static void define_gf_group(VP9_COMP *cpi, int gf_start_show_idx) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + VP9EncoderConfig *const oxcf = &cpi->oxcf; + TWO_PASS *const twopass = &cpi->twopass; + const FRAME_INFO *frame_info = &cpi->frame_info; + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + const FIRSTPASS_STATS *const start_pos = twopass->stats_in; + int gop_coding_frames; + + double gf_group_err = 0.0; + double gf_group_raw_error = 0.0; + double gf_group_noise = 0.0; + double gf_group_skip_pct = 0.0; + double gf_group_inactive_zone_rows = 0.0; + double gf_group_inter = 0.0; + double gf_group_motion = 0.0; + + int allow_alt_ref = is_altref_enabled(cpi); + int use_alt_ref; + + int64_t gf_group_bits; + int gf_arf_bits; + const int is_key_frame = frame_is_intra_only(cm); + // If this is a key frame or the overlay from a previous arf then + // the error score / cost of this frame has already been accounted for. + const int arf_active_or_kf = is_key_frame || rc->source_alt_ref_active; + int is_alt_ref_flash = 0; + + double gop_intra_factor; + int gop_frames; + RANGE active_gf_interval; + // Whether this is at the end of last GOP of this sequence. + int end_of_sequence = 0; + + // Reset the GF group data structures unless this is a key + // frame in which case it will already have been done. + if (is_key_frame == 0) { + vp9_zero(twopass->gf_group); + ++rc->gop_global_index; + } else { + rc->gop_global_index = 0; + } + + vpx_clear_system_state(); + + if (oxcf->use_simple_encode_api) { + active_gf_interval = get_active_gf_inverval_range_simple( + rc->min_gf_interval, arf_active_or_kf, rc->frames_to_key); + } else { + active_gf_interval = get_active_gf_inverval_range( + frame_info, rc, arf_active_or_kf, gf_start_show_idx, + twopass->active_worst_quality, rc->last_boosted_qindex); + } + + if (cpi->multi_layer_arf) { + int arf_layers = get_arf_layers(cpi->multi_layer_arf, oxcf->enable_auto_arf, + active_gf_interval.max); + gop_intra_factor = 1.0 + 0.25 * arf_layers; + } else { + gop_intra_factor = 1.0; + } + + gop_coding_frames = get_gop_coding_frame_num( + &use_alt_ref, frame_info, twopass, rc, gf_start_show_idx, + &active_gf_interval, gop_intra_factor, cpi->oxcf.lag_in_frames, + &end_of_sequence); + use_alt_ref &= allow_alt_ref; +#if CONFIG_RATE_CTRL + // If the external gop_command is on, we will override the decisions + // of gop_coding_frames and use_alt_ref. + if (cpi->oxcf.use_simple_encode_api) { + const GOP_COMMAND *gop_command = &cpi->encode_command.gop_command; + assert(allow_alt_ref == 1); + if (gop_command->use) { + gop_coding_frames = gop_command_coding_frame_count(gop_command); + use_alt_ref = gop_command->use_alt_ref; + } + } +#endif + // If the external rate control model for GOP is used, the gop decisions + // are overwritten. Specifically, |gop_coding_frames| and |use_alt_ref| + // will be overwritten. + if (cpi->ext_ratectrl.ready && + (cpi->ext_ratectrl.funcs.rc_type & VPX_RC_GOP) != 0 && + cpi->ext_ratectrl.funcs.get_gop_decision != NULL && !end_of_sequence) { + vpx_codec_err_t codec_status; + vpx_rc_gop_decision_t gop_decision; + vpx_rc_gop_info_t gop_info; + gop_info.min_gf_interval = rc->min_gf_interval; + gop_info.max_gf_interval = rc->max_gf_interval; + gop_info.active_min_gf_interval = active_gf_interval.min; + gop_info.active_max_gf_interval = active_gf_interval.max; + gop_info.allow_alt_ref = allow_alt_ref; + gop_info.is_key_frame = is_key_frame; + gop_info.last_gop_use_alt_ref = rc->source_alt_ref_active; + gop_info.frames_since_key = rc->frames_since_key; + gop_info.frames_to_key = rc->frames_to_key; + gop_info.lag_in_frames = cpi->oxcf.lag_in_frames; + gop_info.show_index = cm->current_video_frame; + gop_info.coding_index = cm->current_frame_coding_index; + gop_info.gop_global_index = rc->gop_global_index; + + codec_status = vp9_extrc_get_gop_decision(&cpi->ext_ratectrl, &gop_info, + &gop_decision); + if (codec_status != VPX_CODEC_OK) { + vpx_internal_error(&cm->error, codec_status, + "vp9_extrc_get_gop_decision() failed"); + } + gop_coding_frames = gop_decision.gop_coding_frames; + use_alt_ref = gop_decision.use_alt_ref; + } + + // Was the group length constrained by the requirement for a new KF? + rc->constrained_gf_group = (gop_coding_frames >= rc->frames_to_key) ? 1 : 0; + + // Should we use the alternate reference frame. + if (use_alt_ref) { + const int f_frames = + (rc->frames_to_key - gop_coding_frames >= gop_coding_frames - 1) + ? gop_coding_frames - 1 + : VPXMAX(0, rc->frames_to_key - gop_coding_frames); + const int b_frames = gop_coding_frames - 1; + const int avg_inter_frame_qindex = rc->avg_frame_qindex[INTER_FRAME]; + // TODO(angiebird): figure out why arf's location is assigned this way + const int arf_show_idx = VPXMIN(gf_start_show_idx + gop_coding_frames + 1, + fps_get_num_frames(first_pass_info)); + + // Calculate the boost for alt ref. + rc->gfu_boost = + compute_arf_boost(frame_info, twopass, arf_show_idx, f_frames, b_frames, + avg_inter_frame_qindex); + rc->source_alt_ref_pending = 1; + } else { + const int f_frames = gop_coding_frames - 1; + const int b_frames = 0; + const int avg_inter_frame_qindex = rc->avg_frame_qindex[INTER_FRAME]; + // TODO(angiebird): figure out why arf's location is assigned this way + const int gld_show_idx = + VPXMIN(gf_start_show_idx + 1, fps_get_num_frames(first_pass_info)); + const int arf_boost = + compute_arf_boost(frame_info, twopass, gld_show_idx, f_frames, b_frames, + avg_inter_frame_qindex); + rc->gfu_boost = VPXMIN((int)twopass->gf_max_total_boost, arf_boost); + rc->source_alt_ref_pending = 0; + } + +#define LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR 0.2 + rc->arf_active_best_quality_adjustment_factor = 1.0; + rc->arf_increase_active_best_quality = 0; + + if (!is_lossless_requested(&cpi->oxcf)) { + if (rc->frames_since_key >= rc->frames_to_key) { + // Increase the active best quality in the second half of key frame + // interval. + rc->arf_active_best_quality_adjustment_factor = + LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR + + (1.0 - LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR) * + (rc->frames_to_key - gop_coding_frames) / + (VPXMAX(1, ((rc->frames_to_key + rc->frames_since_key) / 2 - + gop_coding_frames))); + rc->arf_increase_active_best_quality = 1; + } else if ((rc->frames_to_key - gop_coding_frames) > 0) { + // Reduce the active best quality in the first half of key frame interval. + rc->arf_active_best_quality_adjustment_factor = + LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR + + (1.0 - LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR) * + (rc->frames_since_key + gop_coding_frames) / + (VPXMAX(1, (rc->frames_to_key + rc->frames_since_key) / 2 + + gop_coding_frames)); + rc->arf_increase_active_best_quality = -1; + } + } + +#ifdef AGGRESSIVE_VBR + // Limit maximum boost based on interval length. + rc->gfu_boost = VPXMIN((int)rc->gfu_boost, gop_coding_frames * 140); +#else + rc->gfu_boost = VPXMIN((int)rc->gfu_boost, gop_coding_frames * 200); +#endif + + // Cap the ARF boost when perceptual quality AQ mode is enabled. This is + // designed to improve the perceptual quality of high value content and to + // make consistent quality across consecutive frames. It will hurt objective + // quality. + if (oxcf->aq_mode == PERCEPTUAL_AQ) + rc->gfu_boost = VPXMIN(rc->gfu_boost, MIN_ARF_GF_BOOST); + + rc->baseline_gf_interval = gop_coding_frames - rc->source_alt_ref_pending; + + if (rc->source_alt_ref_pending) + is_alt_ref_flash = detect_flash(twopass, rc->baseline_gf_interval); + + { + const double av_err = get_distribution_av_err(cpi, twopass); + const double mean_mod_score = twopass->mean_mod_score; + // If the first frame is a key frame or the overlay from a previous arf then + // the error score / cost of this frame has already been accounted for. + int start_idx = arf_active_or_kf ? 1 : 0; + int j; + for (j = start_idx; j < gop_coding_frames; ++j) { + int show_idx = gf_start_show_idx + j; + const FIRSTPASS_STATS *frame_stats = + fps_get_frame_stats(first_pass_info, show_idx); + // Accumulate error score of frames in this gf group. + gf_group_err += calc_norm_frame_score(oxcf, frame_info, frame_stats, + mean_mod_score, av_err); + gf_group_raw_error += frame_stats->coded_error; + gf_group_noise += frame_stats->frame_noise_energy; + gf_group_skip_pct += frame_stats->intra_skip_pct; + gf_group_inactive_zone_rows += frame_stats->inactive_zone_rows; + gf_group_inter += frame_stats->pcnt_inter; + gf_group_motion += frame_stats->pcnt_motion; + } + } + + // Calculate the bits to be allocated to the gf/arf group as a whole + gf_group_bits = calculate_total_gf_group_bits(cpi, gf_group_err); + + gop_frames = + rc->baseline_gf_interval + rc->source_alt_ref_pending - arf_active_or_kf; + + // Store the average moise level measured for the group + // TODO(any): Experiment with removal of else condition (gop_frames = 0) so + // that consumption of group noise energy is based on previous gf group + if (gop_frames > 0) + twopass->gf_group.group_noise_energy = (int)(gf_group_noise / gop_frames); + else + twopass->gf_group.group_noise_energy = 0; + + // Calculate an estimate of the maxq needed for the group. + // We are more aggressive about correcting for sections + // where there could be significant overshoot than for easier + // sections where we do not wish to risk creating an overshoot + // of the allocated bit budget. + if ((cpi->oxcf.rc_mode != VPX_Q) && (rc->baseline_gf_interval > 1)) { + const int vbr_group_bits_per_frame = (int)(gf_group_bits / gop_frames); + const double group_av_err = gf_group_raw_error / gop_frames; + const double group_av_noise = gf_group_noise / gop_frames; + const double group_av_skip_pct = gf_group_skip_pct / gop_frames; + const double group_av_inactive_zone = ((gf_group_inactive_zone_rows * 2) / + (gop_frames * (double)cm->mb_rows)); + int tmp_q = get_twopass_worst_quality( + cpi, group_av_err, (group_av_skip_pct + group_av_inactive_zone), + group_av_noise, vbr_group_bits_per_frame); + twopass->active_worst_quality = + (int)((tmp_q + (twopass->active_worst_quality * + (twopass->active_wq_factor - 1))) / + twopass->active_wq_factor); + +#if CONFIG_ALWAYS_ADJUST_BPM + // Reset rolling actual and target bits counters for ARF groups. + twopass->rolling_arf_group_target_bits = 0; + twopass->rolling_arf_group_actual_bits = 0; +#endif + } + + // Context Adjustment of ARNR filter strength + if (rc->baseline_gf_interval > 1) { + adjust_group_arnr_filter(cpi, (gf_group_noise / gop_frames), + (gf_group_inter / gop_frames), + (gf_group_motion / gop_frames)); + } else { + twopass->arnr_strength_adjustment = 0; + } + + // Calculate the extra bits to be used for boosted frame(s) + gf_arf_bits = calculate_boost_bits((rc->baseline_gf_interval - 1), + rc->gfu_boost, gf_group_bits); + + // Adjust KF group bits and error remaining. + twopass->kf_group_error_left -= gf_group_err; + + // Decide GOP structure. + define_gf_group_structure(cpi); + + // Allocate bits to each of the frames in the GF group. + allocate_gf_group_bits(cpi, gf_group_bits, gf_arf_bits); + + // Reset the file position. + reset_fpf_position(twopass, start_pos); + + // Calculate a section intra ratio used in setting max loop filter. + twopass->section_intra_rating = calculate_section_intra_ratio( + start_pos, twopass->stats_in_end, rc->baseline_gf_interval); + + if (oxcf->resize_mode == RESIZE_DYNAMIC) { + // Default to starting GF groups at normal frame size. + cpi->rc.next_frame_size_selector = UNSCALED; + } +#if !CONFIG_ALWAYS_ADJUST_BPM + // Reset rolling actual and target bits counters for ARF groups. + twopass->rolling_arf_group_target_bits = 0; + twopass->rolling_arf_group_actual_bits = 0; +#endif + rc->preserve_arf_as_gld = rc->preserve_next_arf_as_gld; + rc->preserve_next_arf_as_gld = 0; + // If alt ref frame is flash do not set preserve_arf_as_gld + if (!is_lossless_requested(&cpi->oxcf) && !cpi->use_svc && + cpi->oxcf.aq_mode == NO_AQ && cpi->multi_layer_arf && !is_alt_ref_flash) + rc->preserve_next_arf_as_gld = 1; +} + +// Intra / Inter threshold very low +#define VERY_LOW_II 1.5 +// Clean slide transitions we expect a sharp single frame spike in error. +#define ERROR_SPIKE 5.0 + +// Slide show transition detection. +// Tests for case where there is very low error either side of the current frame +// but much higher just for this frame. This can help detect key frames in +// slide shows even where the slides are pictures of different sizes. +// Also requires that intra and inter errors are very similar to help eliminate +// harmful false positives. +// It will not help if the transition is a fade or other multi-frame effect. +static int slide_transition(const FIRSTPASS_STATS *this_frame, + const FIRSTPASS_STATS *last_frame, + const FIRSTPASS_STATS *next_frame) { + return (this_frame->intra_error < (this_frame->coded_error * VERY_LOW_II)) && + (this_frame->coded_error > (last_frame->coded_error * ERROR_SPIKE)) && + (this_frame->coded_error > (next_frame->coded_error * ERROR_SPIKE)); +} + +// This test looks for anomalous changes in the nature of the intra signal +// related to the previous and next frame as an indicator for coding a key +// frame. This test serves to detect some additional scene cuts, +// especially in lowish motion and low contrast sections, that are missed +// by the other tests. +static int intra_step_transition(const FIRSTPASS_STATS *this_frame, + const FIRSTPASS_STATS *last_frame, + const FIRSTPASS_STATS *next_frame) { + double last_ii_ratio; + double this_ii_ratio; + double next_ii_ratio; + double last_pcnt_intra = 1.0 - last_frame->pcnt_inter; + double this_pcnt_intra = 1.0 - this_frame->pcnt_inter; + double next_pcnt_intra = 1.0 - next_frame->pcnt_inter; + double mod_this_intra = this_pcnt_intra + this_frame->pcnt_neutral; + + // Calculate ii ratio for this frame last frame and next frame. + last_ii_ratio = + last_frame->intra_error / DOUBLE_DIVIDE_CHECK(last_frame->coded_error); + this_ii_ratio = + this_frame->intra_error / DOUBLE_DIVIDE_CHECK(this_frame->coded_error); + next_ii_ratio = + next_frame->intra_error / DOUBLE_DIVIDE_CHECK(next_frame->coded_error); + + // Return true the intra/inter ratio for the current frame is + // low but better in the next and previous frame and the relative usage of + // intra in the current frame is markedly higher than the last and next frame. + if ((this_ii_ratio < 2.0) && (last_ii_ratio > 2.25) && + (next_ii_ratio > 2.25) && (this_pcnt_intra > (3 * last_pcnt_intra)) && + (this_pcnt_intra > (3 * next_pcnt_intra)) && + ((this_pcnt_intra > 0.075) || (mod_this_intra > 0.85))) { + return 1; + // Very low inter intra ratio (i.e. not much gain from inter coding), most + // blocks neutral on coding method and better inter prediction either side + } else if ((this_ii_ratio < 1.25) && (mod_this_intra > 0.85) && + (this_ii_ratio < last_ii_ratio * 0.9) && + (this_ii_ratio < next_ii_ratio * 0.9)) { + return 1; + } else { + return 0; + } +} + +// Minimum % intra coding observed in first pass (1.0 = 100%) +#define MIN_INTRA_LEVEL 0.25 +// Threshold for use of the lagging second reference frame. Scene cuts do not +// usually have a high second ref usage. +#define SECOND_REF_USAGE_THRESH 0.2 +// Hard threshold where the first pass chooses intra for almost all blocks. +// In such a case even if the frame is not a scene cut coding a key frame +// may be a good option. +#define VERY_LOW_INTER_THRESH 0.05 +// Maximum threshold for the relative ratio of intra error score vs best +// inter error score. +#define KF_II_ERR_THRESHOLD 2.5 +#define KF_II_MAX 128.0 +#define II_FACTOR 12.5 +// Test for very low intra complexity which could cause false key frames +#define V_LOW_INTRA 0.5 + +static int test_candidate_kf(const FIRST_PASS_INFO *first_pass_info, + int show_idx) { + const FIRSTPASS_STATS *last_frame = + fps_get_frame_stats(first_pass_info, show_idx - 1); + const FIRSTPASS_STATS *this_frame = + fps_get_frame_stats(first_pass_info, show_idx); + const FIRSTPASS_STATS *next_frame = + fps_get_frame_stats(first_pass_info, show_idx + 1); + int is_viable_kf = 0; + double pcnt_intra = 1.0 - this_frame->pcnt_inter; + + // Does the frame satisfy the primary criteria of a key frame? + // See above for an explanation of the test criteria. + // If so, then examine how well it predicts subsequent frames. + detect_flash_from_frame_stats(next_frame); + if (!detect_flash_from_frame_stats(this_frame) && + !detect_flash_from_frame_stats(next_frame) && + (this_frame->pcnt_second_ref < SECOND_REF_USAGE_THRESH) && + ((this_frame->pcnt_inter < VERY_LOW_INTER_THRESH) || + (slide_transition(this_frame, last_frame, next_frame)) || + (intra_step_transition(this_frame, last_frame, next_frame)) || + (((this_frame->coded_error > (next_frame->coded_error * 1.2)) && + (this_frame->coded_error > (last_frame->coded_error * 1.2))) && + (pcnt_intra > MIN_INTRA_LEVEL) && + ((pcnt_intra + this_frame->pcnt_neutral) > 0.5) && + ((this_frame->intra_error / + DOUBLE_DIVIDE_CHECK(this_frame->coded_error)) < + KF_II_ERR_THRESHOLD)))) { + int i; + double boost_score = 0.0; + double old_boost_score = 0.0; + double decay_accumulator = 1.0; + + // Examine how well the key frame predicts subsequent frames. + for (i = 0; i < 16; ++i) { + const FIRSTPASS_STATS *frame_stats = + fps_get_frame_stats(first_pass_info, show_idx + 1 + i); + double next_iiratio = (II_FACTOR * frame_stats->intra_error / + DOUBLE_DIVIDE_CHECK(frame_stats->coded_error)); + + if (next_iiratio > KF_II_MAX) next_iiratio = KF_II_MAX; + + // Cumulative effect of decay in prediction quality. + if (frame_stats->pcnt_inter > 0.85) + decay_accumulator *= frame_stats->pcnt_inter; + else + decay_accumulator *= (0.85 + frame_stats->pcnt_inter) / 2.0; + + // Keep a running total. + boost_score += (decay_accumulator * next_iiratio); + + // Test various breakout clauses. + if ((frame_stats->pcnt_inter < 0.05) || (next_iiratio < 1.5) || + (((frame_stats->pcnt_inter - frame_stats->pcnt_neutral) < 0.20) && + (next_iiratio < 3.0)) || + ((boost_score - old_boost_score) < 3.0) || + (frame_stats->intra_error < V_LOW_INTRA)) { + break; + } + + old_boost_score = boost_score; + + // Get the next frame details + if (show_idx + 1 + i == fps_get_num_frames(first_pass_info) - 1) break; + } + + // If there is tolerable prediction for at least the next 3 frames then + // break out else discard this potential key frame and move on + if (boost_score > 30.0 && (i > 3)) { + is_viable_kf = 1; + } else { + is_viable_kf = 0; + } + } + + return is_viable_kf; +} + +#define FRAMES_TO_CHECK_DECAY 8 +#define MIN_KF_TOT_BOOST 300 +#define DEFAULT_SCAN_FRAMES_FOR_KF_BOOST 32 +#define MAX_SCAN_FRAMES_FOR_KF_BOOST 48 +#define MIN_SCAN_FRAMES_FOR_KF_BOOST 32 +#define KF_ABS_ZOOM_THRESH 6.0 + +int vp9_get_frames_to_next_key(const VP9EncoderConfig *oxcf, + const TWO_PASS *const twopass, int kf_show_idx, + int min_gf_interval) { + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + double recent_loop_decay[FRAMES_TO_CHECK_DECAY]; + int j; + int frames_to_key; + int max_frames_to_key = first_pass_info->num_frames - kf_show_idx; + max_frames_to_key = VPXMIN(max_frames_to_key, oxcf->key_freq); + + // Initialize the decay rates for the recent frames to check + for (j = 0; j < FRAMES_TO_CHECK_DECAY; ++j) recent_loop_decay[j] = 1.0; + // Find the next keyframe. + if (!oxcf->auto_key) { + frames_to_key = max_frames_to_key; + } else { + frames_to_key = 1; + while (frames_to_key < max_frames_to_key) { + // Provided that we are not at the end of the file... + if (kf_show_idx + frames_to_key + 1 < first_pass_info->num_frames) { + double loop_decay_rate; + double decay_accumulator; + const FIRSTPASS_STATS *next_frame = fps_get_frame_stats( + first_pass_info, kf_show_idx + frames_to_key + 1); + + // Check for a scene cut. + if (test_candidate_kf(first_pass_info, kf_show_idx + frames_to_key)) + break; + + // How fast is the prediction quality decaying? + loop_decay_rate = get_prediction_decay_rate(twopass, next_frame); + + // We want to know something about the recent past... rather than + // as used elsewhere where we are concerned with decay in prediction + // quality since the last GF or KF. + recent_loop_decay[(frames_to_key - 1) % FRAMES_TO_CHECK_DECAY] = + loop_decay_rate; + decay_accumulator = 1.0; + for (j = 0; j < FRAMES_TO_CHECK_DECAY; ++j) + decay_accumulator *= recent_loop_decay[j]; + + // Special check for transition or high motion followed by a + // static scene. + if ((frames_to_key - 1) > min_gf_interval && loop_decay_rate >= 0.999 && + decay_accumulator < 0.9) { + int still_interval = oxcf->key_freq - (frames_to_key - 1); + // TODO(angiebird): Figure out why we use "+1" here + int show_idx = kf_show_idx + frames_to_key; + if (check_transition_to_still(first_pass_info, show_idx, + still_interval)) { + break; + } + } + } + ++frames_to_key; + } + } + return frames_to_key; +} + +static void find_next_key_frame(VP9_COMP *cpi, int kf_show_idx) { + int i; + RATE_CONTROL *const rc = &cpi->rc; + TWO_PASS *const twopass = &cpi->twopass; + GF_GROUP *const gf_group = &twopass->gf_group; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + const FRAME_INFO *frame_info = &cpi->frame_info; + const FIRSTPASS_STATS *const start_position = twopass->stats_in; + const FIRSTPASS_STATS *keyframe_stats = + fps_get_frame_stats(first_pass_info, kf_show_idx); + FIRSTPASS_STATS next_frame; + int kf_bits = 0; + int64_t max_kf_bits; + double zero_motion_accumulator = 1.0; + double zero_motion_sum = 0.0; + double zero_motion_avg; + double motion_compensable_sum = 0.0; + double motion_compensable_avg; + int num_frames = 0; + int kf_boost_scan_frames = DEFAULT_SCAN_FRAMES_FOR_KF_BOOST; + double boost_score = 0.0; + double kf_mod_err = 0.0; + double kf_raw_err = 0.0; + double kf_group_err = 0.0; + double sr_accumulator = 0.0; + double abs_mv_in_out_accumulator = 0.0; + const double av_err = get_distribution_av_err(cpi, twopass); + const double mean_mod_score = twopass->mean_mod_score; + vp9_zero(next_frame); + + cpi->common.frame_type = KEY_FRAME; + rc->frames_since_key = 0; + + // Reset the GF group data structures. + vp9_zero(*gf_group); + + // Is this a forced key frame by interval. + rc->this_key_frame_forced = rc->next_key_frame_forced; + + // Clear the alt ref active flag and last group multi arf flags as they + // can never be set for a key frame. + rc->source_alt_ref_active = 0; + + // KF is always a GF so clear frames till next gf counter. + rc->frames_till_gf_update_due = 0; + + rc->frames_to_key = 1; + + twopass->kf_group_bits = 0; // Total bits available to kf group + twopass->kf_group_error_left = 0.0; // Group modified error score. + + kf_raw_err = keyframe_stats->intra_error; + kf_mod_err = calc_norm_frame_score(oxcf, frame_info, keyframe_stats, + mean_mod_score, av_err); + + rc->frames_to_key = vp9_get_frames_to_next_key(oxcf, twopass, kf_show_idx, + rc->min_gf_interval); + + // If there is a max kf interval set by the user we must obey it. + // We already breakout of the loop above at 2x max. + // This code centers the extra kf if the actual natural interval + // is between 1x and 2x. + if (rc->frames_to_key >= cpi->oxcf.key_freq) { + rc->next_key_frame_forced = 1; + } else { + rc->next_key_frame_forced = 0; + } + + for (i = 0; i < rc->frames_to_key; ++i) { + const FIRSTPASS_STATS *frame_stats = + fps_get_frame_stats(first_pass_info, kf_show_idx + i); + // Accumulate kf group error. + kf_group_err += calc_norm_frame_score(oxcf, frame_info, frame_stats, + mean_mod_score, av_err); + } + + // Calculate the number of bits that should be assigned to the kf group. + if (twopass->bits_left > 0 && twopass->normalized_score_left > 0.0) { + // Maximum number of bits for a single normal frame (not key frame). + const int max_bits = frame_max_bits(rc, &cpi->oxcf); + + // Maximum number of bits allocated to the key frame group. + int64_t max_grp_bits; + + // Default allocation based on bits left and relative + // complexity of the section. + twopass->kf_group_bits = (int64_t)( + twopass->bits_left * (kf_group_err / twopass->normalized_score_left)); + + // Clip based on maximum per frame rate defined by the user. + max_grp_bits = (int64_t)max_bits * (int64_t)rc->frames_to_key; + if (twopass->kf_group_bits > max_grp_bits) + twopass->kf_group_bits = max_grp_bits; + } else { + twopass->kf_group_bits = 0; + } + twopass->kf_group_bits = VPXMAX(0, twopass->kf_group_bits); + + // Scan through the kf group collating various stats used to determine + // how many bits to spend on it. + boost_score = 0.0; + + for (i = 0; i < VPXMIN(MAX_SCAN_FRAMES_FOR_KF_BOOST, (rc->frames_to_key - 1)); + ++i) { + if (EOF == input_stats(twopass, &next_frame)) break; + + zero_motion_sum += next_frame.pcnt_inter - next_frame.pcnt_motion; + motion_compensable_sum += + 1 - (double)next_frame.coded_error / next_frame.intra_error; + num_frames++; + } + + if (num_frames >= MIN_SCAN_FRAMES_FOR_KF_BOOST) { + zero_motion_avg = zero_motion_sum / num_frames; + motion_compensable_avg = motion_compensable_sum / num_frames; + kf_boost_scan_frames = (int)(VPXMAX(64 * zero_motion_avg - 16, + 160 * motion_compensable_avg - 112)); + kf_boost_scan_frames = + VPXMAX(VPXMIN(kf_boost_scan_frames, MAX_SCAN_FRAMES_FOR_KF_BOOST), + MIN_SCAN_FRAMES_FOR_KF_BOOST); + } + reset_fpf_position(twopass, start_position); + + for (i = 0; i < (rc->frames_to_key - 1); ++i) { + if (EOF == input_stats(twopass, &next_frame)) break; + + // The zero motion test here insures that if we mark a kf group as static + // it is static throughout not just the first KF_BOOST_SCAN_MAX_FRAMES. + // It also allows for a larger boost on long static groups. + if ((i <= kf_boost_scan_frames) || (zero_motion_accumulator >= 0.99)) { + double frame_boost; + double zm_factor; + + // Monitor for static sections. + // First frame in kf group the second ref indicator is invalid. + if (i > 0) { + zero_motion_accumulator = + VPXMIN(zero_motion_accumulator, + get_zero_motion_factor(twopass, &next_frame)); + } else { + zero_motion_accumulator = + next_frame.pcnt_inter - next_frame.pcnt_motion; + } + + // Factor 0.75-1.25 based on how much of frame is static. + zm_factor = (0.75 + (zero_motion_accumulator / 2.0)); + + // The second (lagging) ref error is not valid immediately after + // a key frame because either the lag has not built up (in the case of + // the first key frame or it points to a reference before the new key + // frame. + if (i < 2) sr_accumulator = 0.0; + frame_boost = + calc_kf_frame_boost(cpi, &next_frame, &sr_accumulator, 0, zm_factor); + + boost_score += frame_boost; + + // Measure of zoom. Large zoom tends to indicate reduced boost. + abs_mv_in_out_accumulator += + fabs(next_frame.mv_in_out_count * next_frame.pcnt_motion); + + if ((frame_boost < 25.00) || + (abs_mv_in_out_accumulator > KF_ABS_ZOOM_THRESH) || + (sr_accumulator > (kf_raw_err * 1.50))) + break; + } else { + break; + } + } + + reset_fpf_position(twopass, start_position); + + // Store the zero motion percentage + twopass->kf_zeromotion_pct = (int)(zero_motion_accumulator * 100.0); + + // Calculate a section intra ratio used in setting max loop filter. + twopass->key_frame_section_intra_rating = calculate_section_intra_ratio( + start_position, twopass->stats_in_end, rc->frames_to_key); + + // Special case for static / slide show content but don't apply + // if the kf group is very short. + if ((zero_motion_accumulator > 0.99) && (rc->frames_to_key > 8)) { + rc->kf_boost = (int)(twopass->kf_max_total_boost); + } else { + // Apply various clamps for min and max oost + rc->kf_boost = VPXMAX((int)boost_score, (rc->frames_to_key * 3)); + rc->kf_boost = VPXMAX(rc->kf_boost, MIN_KF_TOT_BOOST); + rc->kf_boost = VPXMIN(rc->kf_boost, (int)(twopass->kf_max_total_boost)); + } + + // Work out how many bits to allocate for the key frame itself. + kf_bits = calculate_boost_bits((rc->frames_to_key - 1), rc->kf_boost, + twopass->kf_group_bits); + // Based on the spatial complexity, increase the bits allocated to key frame. + kf_bits += + (int)((twopass->kf_group_bits - kf_bits) * (kf_mod_err / kf_group_err)); + max_kf_bits = + twopass->kf_group_bits - (rc->frames_to_key - 1) * FRAME_OVERHEAD_BITS; + max_kf_bits = lclamp(max_kf_bits, 0, INT_MAX); + kf_bits = VPXMIN(kf_bits, (int)max_kf_bits); + + twopass->kf_group_bits -= kf_bits; + + // Save the bits to spend on the key frame. + gf_group->bit_allocation[0] = kf_bits; + gf_group->update_type[0] = KF_UPDATE; + gf_group->rf_level[0] = KF_STD; + gf_group->layer_depth[0] = 0; + + // Note the total error score of the kf group minus the key frame itself. + twopass->kf_group_error_left = (kf_group_err - kf_mod_err); + + // Adjust the count of total modified error left. + // The count of bits left is adjusted elsewhere based on real coded frame + // sizes. + twopass->normalized_score_left -= kf_group_err; + + if (oxcf->resize_mode == RESIZE_DYNAMIC) { + // Default to normal-sized frame on keyframes. + cpi->rc.next_frame_size_selector = UNSCALED; + } +} + +// Configure image size specific vizier parameters. +// Later these will be set via additional command line options +void vp9_init_vizier_params(TWO_PASS *const twopass, int screen_area) { + // When |use_vizier_rc_params| is 1, we expect the rc parameters below to + // have been initialised on the command line as adjustment factors such + // that a factor of 1.0 will match the default behavior when + // |use_vizier_rc_params| is 0 + if (twopass->use_vizier_rc_params) { + twopass->active_wq_factor *= AV_WQ_FACTOR; + twopass->err_per_mb *= BASELINE_ERR_PER_MB; + twopass->sr_default_decay_limit *= DEFAULT_DECAY_LIMIT; + if (twopass->sr_default_decay_limit > 1.0) // > 1.0 here makes no sense + twopass->sr_default_decay_limit = 1.0; + twopass->sr_diff_factor *= 1.0; + twopass->gf_frame_max_boost *= GF_MAX_FRAME_BOOST; + twopass->gf_max_total_boost *= MAX_GF_BOOST; + // NOTE: In use max boost has precedence over min boost. So even if min is + // somehow set higher than max the final boost value will be clamped to the + // appropriate maximum. + twopass->kf_frame_min_boost *= KF_MIN_FRAME_BOOST; + twopass->kf_frame_max_boost_first *= KF_MAX_FRAME_BOOST; + twopass->kf_frame_max_boost_subs *= KF_MAX_FRAME_BOOST; + twopass->kf_max_total_boost *= MAX_KF_TOT_BOOST; + twopass->zm_factor *= DEFAULT_ZM_FACTOR; + if (twopass->zm_factor > 1.0) // > 1.0 here makes no sense + twopass->zm_factor = 1.0; + + // Correction for the fact that the kf_err_per_mb_factor default is + // already different for different video formats and ensures that a passed + // in value of 1.0 on the vizier command line will still match the current + // default. + if (screen_area < 1280 * 720) { + twopass->kf_err_per_mb *= 2000.0; + } else if (screen_area < 1920 * 1080) { + twopass->kf_err_per_mb *= 500.0; + } else { + twopass->kf_err_per_mb *= 250.0; + } + } else { + // When |use_vizier_rc_params| is 0, use defaults. + twopass->active_wq_factor = AV_WQ_FACTOR; + twopass->err_per_mb = BASELINE_ERR_PER_MB; + twopass->sr_default_decay_limit = DEFAULT_DECAY_LIMIT; + twopass->sr_diff_factor = 1.0; + twopass->gf_frame_max_boost = GF_MAX_FRAME_BOOST; + twopass->gf_max_total_boost = MAX_GF_BOOST; + twopass->kf_frame_min_boost = KF_MIN_FRAME_BOOST; + twopass->kf_frame_max_boost_first = KF_MAX_FRAME_BOOST; + twopass->kf_frame_max_boost_subs = KF_MAX_FRAME_BOOST; + twopass->kf_max_total_boost = MAX_KF_TOT_BOOST; + twopass->zm_factor = DEFAULT_ZM_FACTOR; + + if (screen_area < 1280 * 720) { + twopass->kf_err_per_mb = 2000.0; + } else if (screen_area < 1920 * 1080) { + twopass->kf_err_per_mb = 500.0; + } else { + twopass->kf_err_per_mb = 250.0; + } + } +} + +void vp9_rc_get_second_pass_params(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + TWO_PASS *const twopass = &cpi->twopass; + GF_GROUP *const gf_group = &twopass->gf_group; + FIRSTPASS_STATS this_frame; + const int show_idx = cm->current_video_frame; + + if (cpi->common.current_frame_coding_index == 0 && + cpi->ext_ratectrl.funcs.send_firstpass_stats != NULL) { + const vpx_codec_err_t codec_status = vp9_extrc_send_firstpass_stats( + &cpi->ext_ratectrl, &cpi->twopass.first_pass_info); + if (codec_status != VPX_CODEC_OK) { + vpx_internal_error(&cm->error, codec_status, + "vp9_extrc_send_firstpass_stats() failed"); + } + } + + if (!twopass->stats_in) return; + + // Configure image size specific vizier parameters + if (cm->current_video_frame == 0) { + unsigned int screen_area = (cm->width * cm->height); + + vp9_init_vizier_params(twopass, screen_area); + } + + // If this is an arf frame then we don't want to read the stats file or + // advance the input pointer as we already have what we need. + if (gf_group->update_type[gf_group->index] == ARF_UPDATE) { + int target_rate; + + vp9_zero(this_frame); + this_frame = + cpi->twopass.stats_in_start[cm->current_video_frame + + gf_group->arf_src_offset[gf_group->index]]; + + vp9_configure_buffer_updates(cpi, gf_group->index); + + target_rate = gf_group->bit_allocation[gf_group->index]; + target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate); + rc->base_frame_target = target_rate; + + cm->frame_type = INTER_FRAME; + + // The multiplication by 256 reverses a scaling factor of (>> 8) + // applied when combining MB error values for the frame. + twopass->mb_av_energy = log((this_frame.intra_error * 256.0) + 1.0); + twopass->mb_smooth_pct = this_frame.intra_smooth_pct; + + return; + } + + vpx_clear_system_state(); + + if (cpi->oxcf.rc_mode == VPX_Q) { + twopass->active_worst_quality = cpi->oxcf.cq_level; + } else if (cm->current_video_frame == 0) { + const int frames_left = + (int)(twopass->total_stats.count - cm->current_video_frame); + // Special case code for first frame. + const int section_target_bandwidth = + (int)(twopass->bits_left / frames_left); + const double section_length = twopass->total_left_stats.count; + const double section_error = + twopass->total_left_stats.coded_error / section_length; + const double section_intra_skip = + twopass->total_left_stats.intra_skip_pct / section_length; + const double section_inactive_zone = + (twopass->total_left_stats.inactive_zone_rows * 2) / + ((double)cm->mb_rows * section_length); + const double section_noise = + twopass->total_left_stats.frame_noise_energy / section_length; + int tmp_q; + + tmp_q = get_twopass_worst_quality( + cpi, section_error, section_intra_skip + section_inactive_zone, + section_noise, section_target_bandwidth); + + twopass->active_worst_quality = tmp_q; + twopass->baseline_active_worst_quality = tmp_q; + rc->ni_av_qi = tmp_q; + rc->last_q[INTER_FRAME] = tmp_q; + rc->avg_q = vp9_convert_qindex_to_q(tmp_q, cm->bit_depth); + rc->avg_frame_qindex[INTER_FRAME] = tmp_q; + rc->last_q[KEY_FRAME] = (tmp_q + cpi->oxcf.best_allowed_q) / 2; + rc->avg_frame_qindex[KEY_FRAME] = rc->last_q[KEY_FRAME]; + } + vp9_zero(this_frame); + if (EOF == input_stats(twopass, &this_frame)) return; + + // Set the frame content type flag. + if (this_frame.intra_skip_pct >= FC_ANIMATION_THRESH) + twopass->fr_content_type = FC_GRAPHICS_ANIMATION; + else + twopass->fr_content_type = FC_NORMAL; + + // Keyframe and section processing. + if (rc->frames_to_key == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY)) { + // Define next KF group and assign bits to it. + find_next_key_frame(cpi, show_idx); + } else { + cm->frame_type = INTER_FRAME; + } + + // Define a new GF/ARF group. (Should always enter here for key frames). + if (rc->frames_till_gf_update_due == 0) { + define_gf_group(cpi, show_idx); + + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + +#if ARF_STATS_OUTPUT + { + FILE *fpfile; + fpfile = fopen("arf.stt", "a"); + ++arf_count; + fprintf(fpfile, "%10d %10ld %10d %10d %10ld %10ld\n", + cm->current_video_frame, rc->frames_till_gf_update_due, + rc->kf_boost, arf_count, rc->gfu_boost, cm->frame_type); + + fclose(fpfile); + } +#endif + } + + vp9_configure_buffer_updates(cpi, gf_group->index); + + rc->base_frame_target = gf_group->bit_allocation[gf_group->index]; + + // The multiplication by 256 reverses a scaling factor of (>> 8) + // applied when combining MB error values for the frame. + twopass->mb_av_energy = log((this_frame.intra_error * 256.0) + 1.0); + twopass->mb_smooth_pct = this_frame.intra_smooth_pct; + + // Update the total stats remaining structure. + subtract_stats(&twopass->total_left_stats, &this_frame); +} + +void vp9_twopass_postencode_update(VP9_COMP *cpi) { + TWO_PASS *const twopass = &cpi->twopass; + RATE_CONTROL *const rc = &cpi->rc; + VP9_COMMON *const cm = &cpi->common; + const int bits_used = rc->base_frame_target; + + // VBR correction is done through rc->vbr_bits_off_target. Based on the + // sign of this value, a limited % adjustment is made to the target rate + // of subsequent frames, to try and push it back towards 0. This method + // is designed to prevent extreme behaviour at the end of a clip + // or group of frames. + rc->vbr_bits_off_target += rc->base_frame_target - rc->projected_frame_size; + twopass->bits_left = VPXMAX(twopass->bits_left - bits_used, 0); + + // Target vs actual bits for this arf group. + twopass->rolling_arf_group_target_bits += rc->this_frame_target; + twopass->rolling_arf_group_actual_bits += rc->projected_frame_size; + + // Calculate the pct rc error. + if (rc->total_actual_bits) { + rc->rate_error_estimate = + (int)((rc->vbr_bits_off_target * 100) / rc->total_actual_bits); + rc->rate_error_estimate = clamp(rc->rate_error_estimate, -100, 100); + } else { + rc->rate_error_estimate = 0; + } + + if (cpi->common.frame_type != KEY_FRAME) { + twopass->kf_group_bits -= bits_used; + twopass->last_kfgroup_zeromotion_pct = twopass->kf_zeromotion_pct; + } + twopass->kf_group_bits = VPXMAX(twopass->kf_group_bits, 0); + + // Increment the gf group index ready for the next frame. + ++twopass->gf_group.index; + + // If the rate control is drifting consider adjustment to min or maxq. + if ((cpi->oxcf.rc_mode != VPX_Q) && !cpi->rc.is_src_frame_alt_ref) { + const int maxq_adj_limit = + rc->worst_quality - twopass->active_worst_quality; + const int minq_adj_limit = + (cpi->oxcf.rc_mode == VPX_CQ ? MINQ_ADJ_LIMIT_CQ : MINQ_ADJ_LIMIT); + int aq_extend_min = 0; + int aq_extend_max = 0; + + // Extend min or Max Q range to account for imbalance from the base + // value when using AQ. + if (cpi->oxcf.aq_mode != NO_AQ && cpi->oxcf.aq_mode != PSNR_AQ && + cpi->oxcf.aq_mode != PERCEPTUAL_AQ) { + if (cm->seg.aq_av_offset < 0) { + // The balance of the AQ map tends towarda lowering the average Q. + aq_extend_min = 0; + aq_extend_max = VPXMIN(maxq_adj_limit, -cm->seg.aq_av_offset); + } else { + // The balance of the AQ map tends towards raising the average Q. + aq_extend_min = VPXMIN(minq_adj_limit, cm->seg.aq_av_offset); + aq_extend_max = 0; + } + } + + // Undershoot. + if (rc->rate_error_estimate > cpi->oxcf.under_shoot_pct) { + --twopass->extend_maxq; + if (rc->rolling_target_bits >= rc->rolling_actual_bits) + ++twopass->extend_minq; + // Overshoot. + } else if (rc->rate_error_estimate < -cpi->oxcf.over_shoot_pct) { + --twopass->extend_minq; + if (rc->rolling_target_bits < rc->rolling_actual_bits) + ++twopass->extend_maxq; + } else { + // Adjustment for extreme local overshoot. + if (rc->projected_frame_size > (2 * rc->base_frame_target) && + rc->projected_frame_size > (2 * rc->avg_frame_bandwidth)) + ++twopass->extend_maxq; + + // Unwind undershoot or overshoot adjustment. + if (rc->rolling_target_bits < rc->rolling_actual_bits) + --twopass->extend_minq; + else if (rc->rolling_target_bits > rc->rolling_actual_bits) + --twopass->extend_maxq; + } + + twopass->extend_minq = + clamp(twopass->extend_minq, aq_extend_min, minq_adj_limit); + twopass->extend_maxq = + clamp(twopass->extend_maxq, aq_extend_max, maxq_adj_limit); + + // If there is a big and undexpected undershoot then feed the extra + // bits back in quickly. One situation where this may happen is if a + // frame is unexpectedly almost perfectly predicted by the ARF or GF + // but not very well predcited by the previous frame. + if (!frame_is_kf_gf_arf(cpi) && !cpi->rc.is_src_frame_alt_ref) { + int fast_extra_thresh = rc->base_frame_target / HIGH_UNDERSHOOT_RATIO; + if (rc->projected_frame_size < fast_extra_thresh) { + rc->vbr_bits_off_target_fast += + fast_extra_thresh - rc->projected_frame_size; + rc->vbr_bits_off_target_fast = + VPXMIN(rc->vbr_bits_off_target_fast, (4 * rc->avg_frame_bandwidth)); + + // Fast adaptation of minQ if necessary to use up the extra bits. + if (rc->avg_frame_bandwidth) { + twopass->extend_minq_fast = + (int)(rc->vbr_bits_off_target_fast * 8 / rc->avg_frame_bandwidth); + } + twopass->extend_minq_fast = VPXMIN( + twopass->extend_minq_fast, minq_adj_limit - twopass->extend_minq); + } else if (rc->vbr_bits_off_target_fast) { + twopass->extend_minq_fast = VPXMIN( + twopass->extend_minq_fast, minq_adj_limit - twopass->extend_minq); + } else { + twopass->extend_minq_fast = 0; + } + } + } +} + +#if CONFIG_RATE_CTRL +void vp9_get_next_group_of_picture(const VP9_COMP *cpi, int *first_is_key_frame, + int *use_alt_ref, int *coding_frame_count, + int *first_show_idx, + int *last_gop_use_alt_ref) { + const GOP_COMMAND *gop_command = &cpi->encode_command.gop_command; + // We make a copy of rc here because we want to get information from the + // encoder without changing its state. + // TODO(angiebird): Avoid copying rc here. + RATE_CONTROL rc = cpi->rc; + const int multi_layer_arf = 0; + const int allow_alt_ref = 1; + // We assume that current_video_frame is updated to the show index of the + // frame we are about to called. Note that current_video_frame is updated at + // the end of encode_frame_to_data_rate(). + // TODO(angiebird): Avoid this kind of fragile style. + *first_show_idx = cpi->common.current_video_frame; + *last_gop_use_alt_ref = rc.source_alt_ref_active; + + *first_is_key_frame = 0; + if (rc.frames_to_key == 0) { + rc.frames_to_key = vp9_get_frames_to_next_key( + &cpi->oxcf, &cpi->twopass, *first_show_idx, rc.min_gf_interval); + rc.frames_since_key = 0; + *first_is_key_frame = 1; + } + + if (gop_command->use) { + *coding_frame_count = gop_command_coding_frame_count(gop_command); + *use_alt_ref = gop_command->use_alt_ref; + assert(gop_command->show_frame_count <= rc.frames_to_key); + } else { + *coding_frame_count = vp9_get_gop_coding_frame_count( + &cpi->oxcf, &cpi->twopass, &cpi->frame_info, &rc, *first_show_idx, + multi_layer_arf, allow_alt_ref, *first_is_key_frame, + *last_gop_use_alt_ref, use_alt_ref); + } +} + +int vp9_get_gop_coding_frame_count(const VP9EncoderConfig *oxcf, + const TWO_PASS *const twopass, + const FRAME_INFO *frame_info, + const RATE_CONTROL *rc, int show_idx, + int multi_layer_arf, int allow_alt_ref, + int first_is_key_frame, + int last_gop_use_alt_ref, int *use_alt_ref) { + int frame_count; + double gop_intra_factor; + const int arf_active_or_kf = last_gop_use_alt_ref || first_is_key_frame; + RANGE active_gf_interval; + int arf_layers; + int end_of_sequence = 0; + if (oxcf->use_simple_encode_api) { + active_gf_interval = get_active_gf_inverval_range_simple( + rc->min_gf_interval, arf_active_or_kf, rc->frames_to_key); + } else { + active_gf_interval = get_active_gf_inverval_range( + frame_info, rc, arf_active_or_kf, show_idx, /*active_worst_quality=*/0, + /*last_boosted_qindex=*/0); + } + + arf_layers = get_arf_layers(multi_layer_arf, oxcf->enable_auto_arf, + active_gf_interval.max); + if (multi_layer_arf) { + gop_intra_factor = 1.0 + 0.25 * arf_layers; + } else { + gop_intra_factor = 1.0; + } + + frame_count = get_gop_coding_frame_num( + use_alt_ref, frame_info, twopass, rc, show_idx, &active_gf_interval, + gop_intra_factor, oxcf->lag_in_frames, &end_of_sequence); + *use_alt_ref &= allow_alt_ref; + return frame_count; +} + +// Under CONFIG_RATE_CTRL, once the first_pass_info is ready, the number of +// coding frames (including show frame and alt ref) can be determined. +int vp9_get_coding_frame_num(const VP9EncoderConfig *oxcf, + const TWO_PASS *const twopass, + const FRAME_INFO *frame_info, int multi_layer_arf, + int allow_alt_ref) { + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + int coding_frame_num = 0; + RATE_CONTROL rc; + int gop_coding_frame_count; + int gop_show_frames; + int show_idx = 0; + int last_gop_use_alt_ref = 0; + vp9_rc_init(oxcf, 1, &rc); + + while (show_idx < first_pass_info->num_frames) { + int use_alt_ref; + int first_is_key_frame = 0; + if (rc.frames_to_key == 0) { + rc.frames_to_key = vp9_get_frames_to_next_key(oxcf, twopass, show_idx, + rc.min_gf_interval); + rc.frames_since_key = 0; + first_is_key_frame = 1; + } + + gop_coding_frame_count = vp9_get_gop_coding_frame_count( + oxcf, twopass, frame_info, &rc, show_idx, multi_layer_arf, + allow_alt_ref, first_is_key_frame, last_gop_use_alt_ref, &use_alt_ref); + + rc.source_alt_ref_active = use_alt_ref; + last_gop_use_alt_ref = use_alt_ref; + gop_show_frames = gop_coding_frame_count - use_alt_ref; + rc.frames_to_key -= gop_show_frames; + rc.frames_since_key += gop_show_frames; + show_idx += gop_show_frames; + coding_frame_num += gop_show_frames + use_alt_ref; + } + return coding_frame_num; +} + +void vp9_get_key_frame_map(const VP9EncoderConfig *oxcf, + const TWO_PASS *const twopass, int *key_frame_map) { + const FIRST_PASS_INFO *first_pass_info = &twopass->first_pass_info; + int show_idx = 0; + RATE_CONTROL rc; + vp9_rc_init(oxcf, 1, &rc); + + // key_frame_map points to an int array with size equal to + // first_pass_info->num_frames, which is also the number of show frames in the + // video. + memset(key_frame_map, 0, + sizeof(*key_frame_map) * first_pass_info->num_frames); + while (show_idx < first_pass_info->num_frames) { + int key_frame_group_size; + key_frame_map[show_idx] = 1; + key_frame_group_size = + vp9_get_frames_to_next_key(oxcf, twopass, show_idx, rc.min_gf_interval); + assert(key_frame_group_size > 0); + show_idx += key_frame_group_size; + } + assert(show_idx == first_pass_info->num_frames); +} +#endif // CONFIG_RATE_CTRL + +FIRSTPASS_STATS vp9_get_frame_stats(const TWO_PASS *twopass) { + return twopass->this_frame_stats; +} +FIRSTPASS_STATS vp9_get_total_stats(const TWO_PASS *twopass) { + return twopass->total_stats; +} |