diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/encoder/vp9_ratectrl.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/encoder/vp9_ratectrl.c | 3391 |
1 files changed, 3391 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/encoder/vp9_ratectrl.c b/media/libvpx/libvpx/vp9/encoder/vp9_ratectrl.c new file mode 100644 index 0000000000..62d6b93028 --- /dev/null +++ b/media/libvpx/libvpx/vp9/encoder/vp9_ratectrl.c @@ -0,0 +1,3391 @@ +/* + * 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 <assert.h> +#include <limits.h> +#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "./vpx_dsp_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 "vp9/common/vp9_alloccommon.h" +#include "vp9/common/vp9_blockd.h" +#include "vp9/common/vp9_common.h" +#include "vp9/common/vp9_entropymode.h" +#include "vp9/common/vp9_onyxc_int.h" +#include "vp9/common/vp9_quant_common.h" +#include "vp9/common/vp9_seg_common.h" + +#include "vp9/encoder/vp9_aq_cyclicrefresh.h" +#include "vp9/encoder/vp9_encodemv.h" +#include "vp9/encoder/vp9_encoder.h" +#include "vp9/encoder/vp9_ext_ratectrl.h" +#include "vp9/encoder/vp9_firstpass.h" +#include "vp9/encoder/vp9_ratectrl.h" + +#include "vpx/vpx_codec.h" +#include "vpx/vpx_ext_ratectrl.h" +#include "vpx/internal/vpx_codec_internal.h" + +// Max rate per frame for 1080P and below encodes if no level requirement given. +// For larger formats limit to MAX_MB_RATE bits per MB +// 4Mbits is derived from the level requirement for level 4 (1080P 30) which +// requires that HW can sustain a rate of 16Mbits over a 4 frame group. +// If a lower level requirement is specified then this may over ride this value. +#define MAX_MB_RATE 250 +#define MAXRATE_1080P 4000000 + +#define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1 + +#define MIN_BPB_FACTOR 0.005 +#define MAX_BPB_FACTOR 50 + +#if CONFIG_VP9_HIGHBITDEPTH +#define ASSIGN_MINQ_TABLE(bit_depth, name) \ + do { \ + switch (bit_depth) { \ + case VPX_BITS_8: name = name##_8; break; \ + case VPX_BITS_10: name = name##_10; break; \ + default: \ + assert(bit_depth == VPX_BITS_12); \ + name = name##_12; \ + break; \ + } \ + } while (0) +#else +#define ASSIGN_MINQ_TABLE(bit_depth, name) \ + do { \ + (void)bit_depth; \ + name = name##_8; \ + } while (0) +#endif + +// Tables relating active max Q to active min Q +static int kf_low_motion_minq_8[QINDEX_RANGE]; +static int kf_high_motion_minq_8[QINDEX_RANGE]; +static int arfgf_low_motion_minq_8[QINDEX_RANGE]; +static int arfgf_high_motion_minq_8[QINDEX_RANGE]; +static int inter_minq_8[QINDEX_RANGE]; +static int rtc_minq_8[QINDEX_RANGE]; + +#if CONFIG_VP9_HIGHBITDEPTH +static int kf_low_motion_minq_10[QINDEX_RANGE]; +static int kf_high_motion_minq_10[QINDEX_RANGE]; +static int arfgf_low_motion_minq_10[QINDEX_RANGE]; +static int arfgf_high_motion_minq_10[QINDEX_RANGE]; +static int inter_minq_10[QINDEX_RANGE]; +static int rtc_minq_10[QINDEX_RANGE]; +static int kf_low_motion_minq_12[QINDEX_RANGE]; +static int kf_high_motion_minq_12[QINDEX_RANGE]; +static int arfgf_low_motion_minq_12[QINDEX_RANGE]; +static int arfgf_high_motion_minq_12[QINDEX_RANGE]; +static int inter_minq_12[QINDEX_RANGE]; +static int rtc_minq_12[QINDEX_RANGE]; +#endif + +#ifdef AGGRESSIVE_VBR +static int gf_high = 2400; +static int gf_low = 400; +static int kf_high = 4000; +static int kf_low = 400; +#else +static int gf_high = 2000; +static int gf_low = 400; +static int kf_high = 4800; +static int kf_low = 300; +#endif + +// Functions to compute the active minq lookup table entries based on a +// formulaic approach to facilitate easier adjustment of the Q tables. +// The formulae were derived from computing a 3rd order polynomial best +// fit to the original data (after plotting real maxq vs minq (not q index)) +static int get_minq_index(double maxq, double x3, double x2, double x1, + vpx_bit_depth_t bit_depth) { + int i; + const double minqtarget = VPXMIN(((x3 * maxq + x2) * maxq + x1) * maxq, maxq); + + // Special case handling to deal with the step from q2.0 + // down to lossless mode represented by q 1.0. + if (minqtarget <= 2.0) return 0; + + for (i = 0; i < QINDEX_RANGE; i++) { + if (minqtarget <= vp9_convert_qindex_to_q(i, bit_depth)) return i; + } + + return QINDEX_RANGE - 1; +} + +static void init_minq_luts(int *kf_low_m, int *kf_high_m, int *arfgf_low, + int *arfgf_high, int *inter, int *rtc, + vpx_bit_depth_t bit_depth) { + int i; + for (i = 0; i < QINDEX_RANGE; i++) { + const double maxq = vp9_convert_qindex_to_q(i, bit_depth); + kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth); + kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.45, bit_depth); +#ifdef AGGRESSIVE_VBR + arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.275, bit_depth); + inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.80, bit_depth); +#else + arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth); + inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth); +#endif + arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth); + rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth); + } +} + +void vp9_rc_init_minq_luts(void) { + init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8, + arfgf_low_motion_minq_8, arfgf_high_motion_minq_8, + inter_minq_8, rtc_minq_8, VPX_BITS_8); +#if CONFIG_VP9_HIGHBITDEPTH + init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10, + arfgf_low_motion_minq_10, arfgf_high_motion_minq_10, + inter_minq_10, rtc_minq_10, VPX_BITS_10); + init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12, + arfgf_low_motion_minq_12, arfgf_high_motion_minq_12, + inter_minq_12, rtc_minq_12, VPX_BITS_12); +#endif +} + +// These functions use formulaic calculations to make playing with the +// quantizer tables easier. If necessary they can be replaced by lookup +// tables if and when things settle down in the experimental bitstream +double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) { +// Convert the index to a real Q value (scaled down to match old Q values) +#if CONFIG_VP9_HIGHBITDEPTH + switch (bit_depth) { + case VPX_BITS_8: return vp9_ac_quant(qindex, 0, bit_depth) / 4.0; + case VPX_BITS_10: return vp9_ac_quant(qindex, 0, bit_depth) / 16.0; + default: + assert(bit_depth == VPX_BITS_12); + return vp9_ac_quant(qindex, 0, bit_depth) / 64.0; + } +#else + return vp9_ac_quant(qindex, 0, bit_depth) / 4.0; +#endif +} + +int vp9_convert_q_to_qindex(double q_val, vpx_bit_depth_t bit_depth) { + int i; + + for (i = 0; i < QINDEX_RANGE; ++i) + if (vp9_convert_qindex_to_q(i, bit_depth) >= q_val) break; + + if (i == QINDEX_RANGE) i--; + + return i; +} + +int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, + double correction_factor, vpx_bit_depth_t bit_depth) { + const double q = vp9_convert_qindex_to_q(qindex, bit_depth); + int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000; + + assert(correction_factor <= MAX_BPB_FACTOR && + correction_factor >= MIN_BPB_FACTOR); + + // q based adjustment to baseline enumerator + enumerator += (int)(enumerator * q) >> 12; + return (int)(enumerator * correction_factor / q); +} + +int vp9_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs, + double correction_factor, + vpx_bit_depth_t bit_depth) { + const int bpm = + (int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor, bit_depth)); + return VPXMAX(FRAME_OVERHEAD_BITS, + (int)(((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS)); +} + +int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) { + const RATE_CONTROL *rc = &cpi->rc; + const VP9EncoderConfig *oxcf = &cpi->oxcf; + + const int min_frame_target = + VPXMAX(rc->min_frame_bandwidth, rc->avg_frame_bandwidth >> 5); + if (target < min_frame_target) target = min_frame_target; + if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) { + // If there is an active ARF at this location use the minimum + // bits on this frame even if it is a constructed arf. + // The active maximum quantizer insures that an appropriate + // number of bits will be spent if needed for constructed ARFs. + target = min_frame_target; + } + + // Clip the frame target to the maximum allowed value. + if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth; + + if (oxcf->rc_max_inter_bitrate_pct) { + const int64_t max_rate = + (int64_t)rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100; + // target is of type int and VPXMIN cannot evaluate to larger than target + target = (int)VPXMIN(target, max_rate); + } + return target; +} + +int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) { + const RATE_CONTROL *rc = &cpi->rc; + const VP9EncoderConfig *oxcf = &cpi->oxcf; + if (oxcf->rc_max_intra_bitrate_pct) { + const int64_t max_rate = + (int64_t)rc->avg_frame_bandwidth * oxcf->rc_max_intra_bitrate_pct / 100; + target = (int)VPXMIN(target, max_rate); + } + if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth; + return target; +} + +// TODO(marpan/jianj): bits_off_target and buffer_level are used in the same +// way for CBR mode, for the buffering updates below. Look into removing one +// of these (i.e., bits_off_target). +// Update the buffer level before encoding with the per-frame-bandwidth, +void vp9_update_buffer_level_preencode(VP9_COMP *cpi) { + RATE_CONTROL *const rc = &cpi->rc; + rc->bits_off_target += rc->avg_frame_bandwidth; + // Clip the buffer level to the maximum specified buffer size. + rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size); + rc->buffer_level = rc->bits_off_target; +} + +// Update the buffer level before encoding with the per-frame-bandwidth +// for SVC. The current and all upper temporal layers are updated, needed +// for the layered rate control which involves cumulative buffer levels for +// the temporal layers. Allow for using the timestamp(pts) delta for the +// framerate when the set_ref_frame_config is used. +void vp9_update_buffer_level_svc_preencode(VP9_COMP *cpi) { + SVC *const svc = &cpi->svc; + int i; + // Set this to 1 to use timestamp delta for "framerate" under + // ref_frame_config usage. + int use_timestamp = 1; + const int64_t ts_delta = + svc->time_stamp_superframe - svc->time_stamp_prev[svc->spatial_layer_id]; + for (i = svc->temporal_layer_id; i < svc->number_temporal_layers; ++i) { + const int layer = + LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, svc->number_temporal_layers); + LAYER_CONTEXT *const lc = &svc->layer_context[layer]; + RATE_CONTROL *const lrc = &lc->rc; + if (use_timestamp && cpi->svc.use_set_ref_frame_config && + svc->number_temporal_layers == 1 && ts_delta > 0 && + svc->current_superframe > 0) { + // TODO(marpan): This may need to be modified for temporal layers. + const double framerate_pts = 10000000.0 / ts_delta; + lrc->bits_off_target += (int)round(lc->target_bandwidth / framerate_pts); + } else { + lrc->bits_off_target += (int)round(lc->target_bandwidth / lc->framerate); + } + // Clip buffer level to maximum buffer size for the layer. + lrc->bits_off_target = + VPXMIN(lrc->bits_off_target, lrc->maximum_buffer_size); + lrc->buffer_level = lrc->bits_off_target; + if (i == svc->temporal_layer_id) { + cpi->rc.bits_off_target = lrc->bits_off_target; + cpi->rc.buffer_level = lrc->buffer_level; + } + } +} + +// Update the buffer level for higher temporal layers, given the encoded current +// temporal layer. +static void update_layer_buffer_level_postencode(SVC *svc, + int encoded_frame_size) { + int i = 0; + const int current_temporal_layer = svc->temporal_layer_id; + for (i = current_temporal_layer + 1; i < svc->number_temporal_layers; ++i) { + const int layer = + LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + lrc->bits_off_target -= encoded_frame_size; + // Clip buffer level to maximum buffer size for the layer. + lrc->bits_off_target = + VPXMIN(lrc->bits_off_target, lrc->maximum_buffer_size); + lrc->buffer_level = lrc->bits_off_target; + } +} + +// Update the buffer level after encoding with encoded frame size. +static void update_buffer_level_postencode(VP9_COMP *cpi, + int encoded_frame_size) { + RATE_CONTROL *const rc = &cpi->rc; + rc->bits_off_target -= encoded_frame_size; + // Clip the buffer level to the maximum specified buffer size. + rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size); + // For screen-content mode, and if frame-dropper is off, don't let buffer + // level go below threshold, given here as -rc->maximum_ buffer_size. + if (cpi->oxcf.content == VP9E_CONTENT_SCREEN && + cpi->oxcf.drop_frames_water_mark == 0) + rc->bits_off_target = VPXMAX(rc->bits_off_target, -rc->maximum_buffer_size); + + rc->buffer_level = rc->bits_off_target; + + if (is_one_pass_svc(cpi)) { + update_layer_buffer_level_postencode(&cpi->svc, encoded_frame_size); + } +} + +int vp9_rc_get_default_min_gf_interval(int width, int height, + double framerate) { + // Assume we do not need any constraint lower than 4K 20 fps + static const double factor_safe = 3840 * 2160 * 20.0; + const double factor = width * height * framerate; + const int default_interval = + clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL); + + if (factor <= factor_safe) + return default_interval; + else + return VPXMAX(default_interval, + (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5)); + // Note this logic makes: + // 4K24: 5 + // 4K30: 6 + // 4K60: 12 +} + +int vp9_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) { + int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75)); + interval += (interval & 0x01); // Round to even value + return VPXMAX(interval, min_gf_interval); +} + +void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) { + int i; + + if (pass == 0 && oxcf->rc_mode == VPX_CBR) { + rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q; + rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q; + } else { + rc->avg_frame_qindex[KEY_FRAME] = + (oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2; + rc->avg_frame_qindex[INTER_FRAME] = + (oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2; + } + + rc->last_q[KEY_FRAME] = oxcf->best_allowed_q; + rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q; + + rc->buffer_level = rc->starting_buffer_level; + rc->bits_off_target = rc->starting_buffer_level; + + rc->rolling_target_bits = rc->avg_frame_bandwidth; + rc->rolling_actual_bits = rc->avg_frame_bandwidth; + rc->long_rolling_target_bits = rc->avg_frame_bandwidth; + rc->long_rolling_actual_bits = rc->avg_frame_bandwidth; + + rc->total_actual_bits = 0; + rc->total_target_bits = 0; + rc->total_target_vs_actual = 0; + rc->avg_frame_low_motion = 0; + rc->count_last_scene_change = 0; + rc->af_ratio_onepass_vbr = 10; + rc->prev_avg_source_sad_lag = 0; + rc->high_source_sad = 0; + rc->reset_high_source_sad = 0; + rc->high_source_sad_lagindex = -1; + rc->high_num_blocks_with_motion = 0; + rc->hybrid_intra_scene_change = 0; + rc->re_encode_maxq_scene_change = 0; + rc->alt_ref_gf_group = 0; + rc->last_frame_is_src_altref = 0; + rc->fac_active_worst_inter = 150; + rc->fac_active_worst_gf = 100; + rc->force_qpmin = 0; + for (i = 0; i < MAX_LAG_BUFFERS; ++i) rc->avg_source_sad[i] = 0; + rc->frames_to_key = 0; + rc->frames_since_key = 8; // Sensible default for first frame. + rc->this_key_frame_forced = 0; + rc->next_key_frame_forced = 0; + rc->source_alt_ref_pending = 0; + rc->source_alt_ref_active = 0; + + rc->frames_till_gf_update_due = 0; + rc->constrain_gf_key_freq_onepass_vbr = 1; + rc->ni_av_qi = oxcf->worst_allowed_q; + rc->ni_tot_qi = 0; + rc->ni_frames = 0; + + rc->tot_q = 0.0; + rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth); + + for (i = 0; i < RATE_FACTOR_LEVELS; ++i) { + rc->rate_correction_factors[i] = 1.0; + rc->damped_adjustment[i] = 0; + } + + rc->min_gf_interval = oxcf->min_gf_interval; + rc->max_gf_interval = oxcf->max_gf_interval; + if (rc->min_gf_interval == 0) + rc->min_gf_interval = vp9_rc_get_default_min_gf_interval( + oxcf->width, oxcf->height, oxcf->init_framerate); + if (rc->max_gf_interval == 0) + rc->max_gf_interval = vp9_rc_get_default_max_gf_interval( + oxcf->init_framerate, rc->min_gf_interval); + rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2; + if ((oxcf->pass == 0) && (oxcf->rc_mode == VPX_Q)) { + rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL; + } else { + rc->static_scene_max_gf_interval = MAX_STATIC_GF_GROUP_LENGTH; + } + + rc->force_max_q = 0; + rc->last_post_encode_dropped_scene_change = 0; + rc->use_post_encode_drop = 0; + rc->ext_use_post_encode_drop = 0; + rc->disable_overshoot_maxq_cbr = 0; + rc->arf_active_best_quality_adjustment_factor = 1.0; + rc->arf_increase_active_best_quality = 0; + rc->preserve_arf_as_gld = 0; + rc->preserve_next_arf_as_gld = 0; + rc->show_arf_as_gld = 0; +} + +static int check_buffer_above_thresh(VP9_COMP *cpi, int drop_mark) { + SVC *svc = &cpi->svc; + if (!cpi->use_svc || cpi->svc.framedrop_mode != FULL_SUPERFRAME_DROP) { + RATE_CONTROL *const rc = &cpi->rc; + return (rc->buffer_level > drop_mark); + } else { + int i; + // For SVC in the FULL_SUPERFRAME_DROP): the condition on + // buffer (if its above threshold, so no drop) is checked on current and + // upper spatial layers. If any spatial layer is not above threshold then + // we return 0. + for (i = svc->spatial_layer_id; i < svc->number_spatial_layers; ++i) { + const int layer = LAYER_IDS_TO_IDX(i, svc->temporal_layer_id, + svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + // Exclude check for layer whose bitrate is 0. + if (lc->target_bandwidth > 0) { + const int drop_mark_layer = (int)(cpi->svc.framedrop_thresh[i] * + lrc->optimal_buffer_level / 100); + if (!(lrc->buffer_level > drop_mark_layer)) return 0; + } + } + return 1; + } +} + +static int check_buffer_below_thresh(VP9_COMP *cpi, int drop_mark) { + SVC *svc = &cpi->svc; + if (!cpi->use_svc || cpi->svc.framedrop_mode == LAYER_DROP) { + RATE_CONTROL *const rc = &cpi->rc; + return (rc->buffer_level <= drop_mark); + } else { + int i; + // For SVC in the constrained framedrop mode (svc->framedrop_mode = + // CONSTRAINED_LAYER_DROP or FULL_SUPERFRAME_DROP): the condition on + // buffer (if its below threshold, so drop frame) is checked on current + // and upper spatial layers. For FULL_SUPERFRAME_DROP mode if any + // spatial layer is <= threshold, then we return 1 (drop). + for (i = svc->spatial_layer_id; i < svc->number_spatial_layers; ++i) { + const int layer = LAYER_IDS_TO_IDX(i, svc->temporal_layer_id, + svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + // Exclude check for layer whose bitrate is 0. + if (lc->target_bandwidth > 0) { + const int drop_mark_layer = (int)(cpi->svc.framedrop_thresh[i] * + lrc->optimal_buffer_level / 100); + if (cpi->svc.framedrop_mode == FULL_SUPERFRAME_DROP) { + if (lrc->buffer_level <= drop_mark_layer) return 1; + } else { + if (!(lrc->buffer_level <= drop_mark_layer)) return 0; + } + } + } + if (cpi->svc.framedrop_mode == FULL_SUPERFRAME_DROP) + return 0; + else + return 1; + } +} + +int vp9_test_drop(VP9_COMP *cpi) { + const VP9EncoderConfig *oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + SVC *svc = &cpi->svc; + int drop_frames_water_mark = oxcf->drop_frames_water_mark; + if (cpi->use_svc) { + // If we have dropped max_consec_drop frames, then we don't + // drop this spatial layer, and reset counter to 0. + if (svc->drop_count[svc->spatial_layer_id] == svc->max_consec_drop) { + svc->drop_count[svc->spatial_layer_id] = 0; + return 0; + } else { + drop_frames_water_mark = svc->framedrop_thresh[svc->spatial_layer_id]; + } + } + if (!drop_frames_water_mark || + (svc->spatial_layer_id > 0 && + svc->framedrop_mode == FULL_SUPERFRAME_DROP)) { + return 0; + } else { + if ((rc->buffer_level < 0 && svc->framedrop_mode != FULL_SUPERFRAME_DROP) || + (check_buffer_below_thresh(cpi, -1) && + svc->framedrop_mode == FULL_SUPERFRAME_DROP)) { + // Always drop if buffer is below 0. + return 1; + } else { + // If buffer is below drop_mark, for now just drop every other frame + // (starting with the next frame) until it increases back over drop_mark. + int drop_mark = + (int)(drop_frames_water_mark * rc->optimal_buffer_level / 100); + if (check_buffer_above_thresh(cpi, drop_mark) && + (rc->decimation_factor > 0)) { + --rc->decimation_factor; + } else if (check_buffer_below_thresh(cpi, drop_mark) && + rc->decimation_factor == 0) { + rc->decimation_factor = 1; + } + if (rc->decimation_factor > 0) { + if (rc->decimation_count > 0) { + --rc->decimation_count; + return 1; + } else { + rc->decimation_count = rc->decimation_factor; + return 0; + } + } else { + rc->decimation_count = 0; + return 0; + } + } + } +} + +int post_encode_drop_cbr(VP9_COMP *cpi, size_t *size) { + size_t frame_size = *size << 3; + int64_t new_buffer_level = + cpi->rc.buffer_level + cpi->rc.avg_frame_bandwidth - (int64_t)frame_size; + + // For now we drop if new buffer level (given the encoded frame size) goes + // below 0. + if (new_buffer_level < 0) { + *size = 0; + vp9_rc_postencode_update_drop_frame(cpi); + // Update flag to use for next frame. + if (cpi->rc.high_source_sad || + (cpi->use_svc && cpi->svc.high_source_sad_superframe)) + cpi->rc.last_post_encode_dropped_scene_change = 1; + // Force max_q on next fame. + cpi->rc.force_max_q = 1; + cpi->rc.avg_frame_qindex[INTER_FRAME] = cpi->rc.worst_quality; + cpi->last_frame_dropped = 1; + cpi->ext_refresh_frame_flags_pending = 0; + if (cpi->use_svc) { + SVC *svc = &cpi->svc; + int sl = 0; + int tl = 0; + svc->last_layer_dropped[svc->spatial_layer_id] = 1; + svc->drop_spatial_layer[svc->spatial_layer_id] = 1; + svc->drop_count[svc->spatial_layer_id]++; + svc->skip_enhancement_layer = 1; + // Postencode drop is only checked on base spatial layer, + // for now if max-q is set on base we force it on all layers. + for (sl = 0; sl < svc->number_spatial_layers; ++sl) { + for (tl = 0; tl < svc->number_temporal_layers; ++tl) { + const int layer = + LAYER_IDS_TO_IDX(sl, tl, svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + lrc->force_max_q = 1; + lrc->avg_frame_qindex[INTER_FRAME] = cpi->rc.worst_quality; + } + } + } + return 1; + } + + cpi->rc.force_max_q = 0; + cpi->rc.last_post_encode_dropped_scene_change = 0; + return 0; +} + +int vp9_rc_drop_frame(VP9_COMP *cpi) { + SVC *svc = &cpi->svc; + int svc_prev_layer_dropped = 0; + // In the constrained or full_superframe framedrop mode for svc + // (framedrop_mode != (LAYER_DROP && CONSTRAINED_FROM_ABOVE)), + // if the previous spatial layer was dropped, drop the current spatial layer. + if (cpi->use_svc && svc->spatial_layer_id > 0 && + svc->drop_spatial_layer[svc->spatial_layer_id - 1]) + svc_prev_layer_dropped = 1; + if ((svc_prev_layer_dropped && svc->framedrop_mode != LAYER_DROP && + svc->framedrop_mode != CONSTRAINED_FROM_ABOVE_DROP) || + svc->force_drop_constrained_from_above[svc->spatial_layer_id] || + vp9_test_drop(cpi)) { + vp9_rc_postencode_update_drop_frame(cpi); + cpi->ext_refresh_frame_flags_pending = 0; + cpi->last_frame_dropped = 1; + if (cpi->use_svc) { + svc->last_layer_dropped[svc->spatial_layer_id] = 1; + svc->drop_spatial_layer[svc->spatial_layer_id] = 1; + svc->drop_count[svc->spatial_layer_id]++; + svc->skip_enhancement_layer = 1; + if (svc->framedrop_mode == LAYER_DROP || + (svc->framedrop_mode == CONSTRAINED_FROM_ABOVE_DROP && + svc->force_drop_constrained_from_above[svc->number_spatial_layers - + 1] == 0) || + svc->drop_spatial_layer[0] == 0) { + // For the case of constrained drop mode where full superframe is + // dropped, we don't increment the svc frame counters. + // In particular temporal layer counter (which is incremented in + // vp9_inc_frame_in_layer()) won't be incremented, so on a dropped + // frame we try the same temporal_layer_id on next incoming frame. + // This is to avoid an issue with temporal alignment with full + // superframe dropping. + vp9_inc_frame_in_layer(cpi); + } + if (svc->spatial_layer_id == svc->number_spatial_layers - 1) { + int i; + int all_layers_drop = 1; + for (i = 0; i < svc->spatial_layer_id; i++) { + if (svc->drop_spatial_layer[i] == 0) { + all_layers_drop = 0; + break; + } + } + if (all_layers_drop == 1) svc->skip_enhancement_layer = 0; + } + } + return 1; + } + return 0; +} + +static int adjust_q_cbr(const VP9_COMP *cpi, int q) { + // This makes sure q is between oscillating Qs to prevent resonance. + if (!cpi->rc.reset_high_source_sad && + (!cpi->oxcf.gf_cbr_boost_pct || + !(cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)) && + (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) && + cpi->rc.q_1_frame != cpi->rc.q_2_frame) { + int qclamp = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame), + VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame)); + // If the previous frame had overshoot and the current q needs to increase + // above the clamped value, reduce the clamp for faster reaction to + // overshoot. + if (cpi->rc.rc_1_frame == -1 && q > qclamp) + q = (q + qclamp) >> 1; + else + q = qclamp; + } + if (cpi->oxcf.content == VP9E_CONTENT_SCREEN && + cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) + vp9_cyclic_refresh_limit_q(cpi, &q); + return VPXMAX(VPXMIN(q, cpi->rc.worst_quality), cpi->rc.best_quality); +} + +static double get_rate_correction_factor(const VP9_COMP *cpi) { + const RATE_CONTROL *const rc = &cpi->rc; + const VP9_COMMON *const cm = &cpi->common; + double rcf; + + if (frame_is_intra_only(cm)) { + rcf = rc->rate_correction_factors[KF_STD]; + } else if (cpi->oxcf.pass == 2) { + RATE_FACTOR_LEVEL rf_lvl = + cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index]; + rcf = rc->rate_correction_factors[rf_lvl]; + } else { + if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && + !rc->is_src_frame_alt_ref && !cpi->use_svc && + (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 100)) + rcf = rc->rate_correction_factors[GF_ARF_STD]; + else + rcf = rc->rate_correction_factors[INTER_NORMAL]; + } + rcf *= rcf_mult[rc->frame_size_selector]; + return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR); +} + +static void set_rate_correction_factor(VP9_COMP *cpi, double factor) { + RATE_CONTROL *const rc = &cpi->rc; + const VP9_COMMON *const cm = &cpi->common; + + // Normalize RCF to account for the size-dependent scaling factor. + factor /= rcf_mult[cpi->rc.frame_size_selector]; + + factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR); + + if (frame_is_intra_only(cm)) { + rc->rate_correction_factors[KF_STD] = factor; + } else if (cpi->oxcf.pass == 2) { + RATE_FACTOR_LEVEL rf_lvl = + cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index]; + rc->rate_correction_factors[rf_lvl] = factor; + } else { + if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && + !rc->is_src_frame_alt_ref && !cpi->use_svc && + (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 100)) + rc->rate_correction_factors[GF_ARF_STD] = factor; + else + rc->rate_correction_factors[INTER_NORMAL] = factor; + } +} + +void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + int correction_factor = 100; + double rate_correction_factor = get_rate_correction_factor(cpi); + double adjustment_limit; + RATE_FACTOR_LEVEL rf_lvl = + cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index]; + + int projected_size_based_on_q = 0; + + // Do not update the rate factors for arf overlay frames. + if (cpi->rc.is_src_frame_alt_ref) return; + + // Clear down mmx registers to allow floating point in what follows + vpx_clear_system_state(); + + // Work out how big we would have expected the frame to be at this Q given + // the current correction factor. + // Stay in double to avoid int overflow when values are large + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) { + projected_size_based_on_q = + vp9_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor); + } else { + FRAME_TYPE frame_type = cm->intra_only ? KEY_FRAME : cm->frame_type; + projected_size_based_on_q = + vp9_estimate_bits_at_q(frame_type, cm->base_qindex, cm->MBs, + rate_correction_factor, cm->bit_depth); + } + // Work out a size correction factor. + if (projected_size_based_on_q > FRAME_OVERHEAD_BITS) + correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) / + projected_size_based_on_q); + + // Do not use damped adjustment for the first frame of each frame type + if (!cpi->rc.damped_adjustment[rf_lvl]) { + adjustment_limit = 1.0; + cpi->rc.damped_adjustment[rf_lvl] = 1; + } else { + // More heavily damped adjustment used if we have been oscillating either + // side of target. + adjustment_limit = + 0.25 + 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor))); + } + + cpi->rc.q_2_frame = cpi->rc.q_1_frame; + cpi->rc.q_1_frame = cm->base_qindex; + cpi->rc.rc_2_frame = cpi->rc.rc_1_frame; + if (correction_factor > 110) + cpi->rc.rc_1_frame = -1; + else if (correction_factor < 90) + cpi->rc.rc_1_frame = 1; + else + cpi->rc.rc_1_frame = 0; + + // Turn off oscilation detection in the case of massive overshoot. + if (cpi->rc.rc_1_frame == -1 && cpi->rc.rc_2_frame == 1 && + correction_factor > 1000) { + cpi->rc.rc_2_frame = 0; + } + + if (correction_factor > 102) { + // We are not already at the worst allowable quality + correction_factor = + (int)(100 + ((correction_factor - 100) * adjustment_limit)); + rate_correction_factor = (rate_correction_factor * correction_factor) / 100; + // Keep rate_correction_factor within limits + if (rate_correction_factor > MAX_BPB_FACTOR) + rate_correction_factor = MAX_BPB_FACTOR; + } else if (correction_factor < 99) { + // We are not already at the best allowable quality + correction_factor = + (int)(100 - ((100 - correction_factor) * adjustment_limit)); + rate_correction_factor = (rate_correction_factor * correction_factor) / 100; + + // Keep rate_correction_factor within limits + if (rate_correction_factor < MIN_BPB_FACTOR) + rate_correction_factor = MIN_BPB_FACTOR; + } + + set_rate_correction_factor(cpi, rate_correction_factor); +} + +int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame, + int active_best_quality, int active_worst_quality) { + const VP9_COMMON *const cm = &cpi->common; + CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; + int q = active_worst_quality; + int last_error = INT_MAX; + int i, target_bits_per_mb, bits_per_mb_at_this_q; + const double correction_factor = get_rate_correction_factor(cpi); + + // Calculate required scaling factor based on target frame size and size of + // frame produced using previous Q. + target_bits_per_mb = + (int)(((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs); + + i = active_best_quality; + + do { + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cr->apply_cyclic_refresh && + (!cpi->oxcf.gf_cbr_boost_pct || !cpi->refresh_golden_frame)) { + bits_per_mb_at_this_q = + (int)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor); + } else { + FRAME_TYPE frame_type = cm->intra_only ? KEY_FRAME : cm->frame_type; + bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb( + frame_type, i, correction_factor, cm->bit_depth); + } + + if (bits_per_mb_at_this_q <= target_bits_per_mb) { + if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error) + q = i; + else + q = i - 1; + + break; + } else { + last_error = bits_per_mb_at_this_q - target_bits_per_mb; + } + } while (++i <= active_worst_quality); + + // Adjustment to q for CBR mode. + if (cpi->oxcf.rc_mode == VPX_CBR) return adjust_q_cbr(cpi, q); + + return q; +} + +static int get_active_quality(int q, int gfu_boost, int low, int high, + int *low_motion_minq, int *high_motion_minq) { + if (gfu_boost > high) { + return low_motion_minq[q]; + } else if (gfu_boost < low) { + return high_motion_minq[q]; + } else { + const int gap = high - low; + const int offset = high - gfu_boost; + const int qdiff = high_motion_minq[q] - low_motion_minq[q]; + const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap; + return low_motion_minq[q] + adjustment; + } +} + +static int get_kf_active_quality(const RATE_CONTROL *const rc, int q, + vpx_bit_depth_t bit_depth) { + int *kf_low_motion_minq; + int *kf_high_motion_minq; + ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq); + ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq); + return get_active_quality(q, rc->kf_boost, kf_low, kf_high, + kf_low_motion_minq, kf_high_motion_minq); +} + +static int get_gf_active_quality(const VP9_COMP *const cpi, int q, + vpx_bit_depth_t bit_depth) { + const GF_GROUP *const gf_group = &cpi->twopass.gf_group; + const RATE_CONTROL *const rc = &cpi->rc; + + int *arfgf_low_motion_minq; + int *arfgf_high_motion_minq; + const int gfu_boost = cpi->multi_layer_arf + ? gf_group->gfu_boost[gf_group->index] + : rc->gfu_boost; + ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq); + ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq); + return get_active_quality(q, gfu_boost, gf_low, gf_high, + arfgf_low_motion_minq, arfgf_high_motion_minq); +} + +static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) { + const RATE_CONTROL *const rc = &cpi->rc; + const unsigned int curr_frame = cpi->common.current_video_frame; + int active_worst_quality; + + if (cpi->common.frame_type == KEY_FRAME) { + active_worst_quality = + curr_frame == 0 ? rc->worst_quality : rc->last_q[KEY_FRAME] << 1; + } else { + if (!rc->is_src_frame_alt_ref && !cpi->use_svc && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + active_worst_quality = + curr_frame == 1 + ? rc->last_q[KEY_FRAME] * 5 >> 2 + : rc->last_q[INTER_FRAME] * rc->fac_active_worst_gf / 100; + } else { + active_worst_quality = curr_frame == 1 + ? rc->last_q[KEY_FRAME] << 1 + : rc->avg_frame_qindex[INTER_FRAME] * + rc->fac_active_worst_inter / 100; + } + } + return VPXMIN(active_worst_quality, rc->worst_quality); +} + +// Adjust active_worst_quality level based on buffer level. +static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) { + // Adjust active_worst_quality: If buffer is above the optimal/target level, + // bring active_worst_quality down depending on fullness of buffer. + // If buffer is below the optimal level, let the active_worst_quality go from + // ambient Q (at buffer = optimal level) to worst_quality level + // (at buffer = critical level). + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *rc = &cpi->rc; + // Buffer level below which we push active_worst to worst_quality. + int64_t critical_level = rc->optimal_buffer_level >> 3; + int64_t buff_lvl_step = 0; + int adjustment = 0; + int active_worst_quality; + int ambient_qp; + unsigned int num_frames_weight_key = 5 * cpi->svc.number_temporal_layers; + if (frame_is_intra_only(cm) || rc->reset_high_source_sad || rc->force_max_q) + return rc->worst_quality; + // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME] + // for the first few frames following key frame. These are both initialized + // to worst_quality and updated with (3/4, 1/4) average in postencode_update. + // So for first few frames following key, the qp of that key frame is weighted + // into the active_worst_quality setting. + ambient_qp = (cm->current_video_frame < num_frames_weight_key) + ? VPXMIN(rc->avg_frame_qindex[INTER_FRAME], + rc->avg_frame_qindex[KEY_FRAME]) + : rc->avg_frame_qindex[INTER_FRAME]; + active_worst_quality = VPXMIN(rc->worst_quality, (ambient_qp * 5) >> 2); + // For SVC if the current base spatial layer was key frame, use the QP from + // that base layer for ambient_qp. + if (cpi->use_svc && cpi->svc.spatial_layer_id > 0) { + int layer = LAYER_IDS_TO_IDX(0, cpi->svc.temporal_layer_id, + cpi->svc.number_temporal_layers); + const LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer]; + if (lc->is_key_frame) { + const RATE_CONTROL *lrc = &lc->rc; + ambient_qp = VPXMIN(ambient_qp, lrc->last_q[KEY_FRAME]); + active_worst_quality = VPXMIN(rc->worst_quality, (ambient_qp * 9) >> 3); + } + } + if (rc->buffer_level > rc->optimal_buffer_level) { + // Adjust down. + // Maximum limit for down adjustment ~30%; make it lower for screen content. + int max_adjustment_down = active_worst_quality / 3; + if (cpi->oxcf.content == VP9E_CONTENT_SCREEN) + max_adjustment_down = active_worst_quality >> 3; + if (max_adjustment_down) { + buff_lvl_step = ((rc->maximum_buffer_size - rc->optimal_buffer_level) / + max_adjustment_down); + if (buff_lvl_step) + adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) / + buff_lvl_step); + active_worst_quality -= adjustment; + } + } else if (rc->buffer_level > critical_level) { + // Adjust up from ambient Q. + if (critical_level) { + buff_lvl_step = (rc->optimal_buffer_level - critical_level); + if (buff_lvl_step) { + adjustment = (int)((rc->worst_quality - ambient_qp) * + (rc->optimal_buffer_level - rc->buffer_level) / + buff_lvl_step); + } + active_worst_quality = ambient_qp + adjustment; + } + } else { + // Set to worst_quality if buffer is below critical level. + active_worst_quality = rc->worst_quality; + } + return active_worst_quality; +} + +static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi, + int *bottom_index, + int *top_index) { + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + int active_best_quality; + int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); + int q; + int *rtc_minq; + ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq); + + if (frame_is_intra_only(cm)) { + active_best_quality = rc->best_quality; + // Handle the special case for key frames forced when we have reached + // the maximum key frame interval. Here force the Q to a range + // based on the ambient Q to reduce the risk of popping. + if (rc->this_key_frame_forced) { + int qindex = rc->last_boosted_qindex; + double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + int delta_qindex = vp9_compute_qdelta( + rc, last_boosted_q, (last_boosted_q * 0.75), cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } else if (cm->current_video_frame > 0) { + // not first frame of one pass and kf_boost is set + double q_adj_factor = 1.0; + double q_val; + + active_best_quality = get_kf_active_quality( + rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth); + + // Allow somewhat lower kf minq with small image formats. + if ((cm->width * cm->height) <= (352 * 288)) { + q_adj_factor -= 0.25; + } + + // Convert the adjustment factor to a qindex delta + // on active_best_quality. + q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth); + active_best_quality += + vp9_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth); + } + } else if (!rc->is_src_frame_alt_ref && !cpi->use_svc && + cpi->oxcf.gf_cbr_boost_pct && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + // Use the lower of active_worst_quality and recent + // average Q as basis for GF/ARF best Q limit unless last frame was + // a key frame. + if (rc->frames_since_key > 1 && + rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { + q = rc->avg_frame_qindex[INTER_FRAME]; + } else { + q = active_worst_quality; + } + active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth); + } else { + // Use the lower of active_worst_quality and recent/average Q. + if (cm->current_video_frame > 1) { + if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) + active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]]; + else + active_best_quality = rtc_minq[active_worst_quality]; + } else { + if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality) + active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]]; + else + active_best_quality = rtc_minq[active_worst_quality]; + } + } + + // Clip the active best and worst quality values to limits + active_best_quality = + clamp(active_best_quality, rc->best_quality, rc->worst_quality); + active_worst_quality = + clamp(active_worst_quality, active_best_quality, rc->worst_quality); + + *top_index = active_worst_quality; + *bottom_index = active_best_quality; + + // Special case code to try and match quality with forced key frames + if (frame_is_intra_only(cm) && rc->this_key_frame_forced) { + q = rc->last_boosted_qindex; + } else { + q = vp9_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, + active_worst_quality); + if (q > *top_index) { + // Special case when we are targeting the max allowed rate + if (rc->this_frame_target >= rc->max_frame_bandwidth) + *top_index = q; + else + q = *top_index; + } + } + + assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); + assert(*bottom_index <= rc->worst_quality && + *bottom_index >= rc->best_quality); + assert(q <= rc->worst_quality && q >= rc->best_quality); + return q; +} + +static int get_active_cq_level_one_pass(const RATE_CONTROL *rc, + const VP9EncoderConfig *const oxcf) { + static const double cq_adjust_threshold = 0.1; + int active_cq_level = oxcf->cq_level; + if (oxcf->rc_mode == VPX_CQ && rc->total_target_bits > 0) { + const double x = (double)rc->total_actual_bits / rc->total_target_bits; + if (x < cq_adjust_threshold) { + active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold); + } + } + return active_cq_level; +} + +#define SMOOTH_PCT_MIN 0.1 +#define SMOOTH_PCT_DIV 0.05 +static int get_active_cq_level_two_pass(const TWO_PASS *twopass, + const RATE_CONTROL *rc, + const VP9EncoderConfig *const oxcf) { + static const double cq_adjust_threshold = 0.1; + int active_cq_level = oxcf->cq_level; + if (oxcf->rc_mode == VPX_CQ) { + if (twopass->mb_smooth_pct > SMOOTH_PCT_MIN) { + active_cq_level -= + (int)((twopass->mb_smooth_pct - SMOOTH_PCT_MIN) / SMOOTH_PCT_DIV); + active_cq_level = VPXMAX(active_cq_level, 0); + } + if (rc->total_target_bits > 0) { + const double x = (double)rc->total_actual_bits / rc->total_target_bits; + if (x < cq_adjust_threshold) { + active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold); + } + } + } + return active_cq_level; +} + +static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi, + int *bottom_index, + int *top_index) { + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + const int cq_level = get_active_cq_level_one_pass(rc, oxcf); + int active_best_quality; + int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi); + int q; + int *inter_minq; + ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq); + + if (frame_is_intra_only(cm)) { + if (oxcf->rc_mode == VPX_Q) { + int qindex = cq_level; + double qstart = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + int delta_qindex = + vp9_compute_qdelta(rc, qstart, qstart * 0.25, cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } else if (rc->this_key_frame_forced) { + // Handle the special case for key frames forced when we have reached + // the maximum key frame interval. Here force the Q to a range + // based on the ambient Q to reduce the risk of popping. + int qindex = rc->last_boosted_qindex; + double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + int delta_qindex = vp9_compute_qdelta( + rc, last_boosted_q, last_boosted_q * 0.75, cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } else { + // not first frame of one pass and kf_boost is set + double q_adj_factor = 1.0; + double q_val; + + active_best_quality = get_kf_active_quality( + rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth); + + // Allow somewhat lower kf minq with small image formats. + if ((cm->width * cm->height) <= (352 * 288)) { + q_adj_factor -= 0.25; + } + + // Convert the adjustment factor to a qindex delta + // on active_best_quality. + q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth); + active_best_quality += + vp9_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth); + } + } else if (!rc->is_src_frame_alt_ref && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + // Use the lower of active_worst_quality and recent + // average Q as basis for GF/ARF best Q limit unless last frame was + // a key frame. + if (rc->frames_since_key > 1) { + if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { + q = rc->avg_frame_qindex[INTER_FRAME]; + } else { + q = active_worst_quality; + } + } else { + q = rc->avg_frame_qindex[KEY_FRAME]; + } + // For constrained quality don't allow Q less than the cq level + if (oxcf->rc_mode == VPX_CQ) { + if (q < cq_level) q = cq_level; + + active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth); + + // Constrained quality use slightly lower active best. + active_best_quality = active_best_quality * 15 / 16; + + } else if (oxcf->rc_mode == VPX_Q) { + int qindex = cq_level; + double qstart = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + int delta_qindex; + if (cpi->refresh_alt_ref_frame) + delta_qindex = + vp9_compute_qdelta(rc, qstart, qstart * 0.40, cm->bit_depth); + else + delta_qindex = + vp9_compute_qdelta(rc, qstart, qstart * 0.50, cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } else { + active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth); + } + } else { + if (oxcf->rc_mode == VPX_Q) { + int qindex = cq_level; + double qstart = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + double delta_rate[FIXED_GF_INTERVAL] = { 0.50, 1.0, 0.85, 1.0, + 0.70, 1.0, 0.85, 1.0 }; + int delta_qindex = vp9_compute_qdelta( + rc, qstart, + qstart * delta_rate[cm->current_video_frame % FIXED_GF_INTERVAL], + cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } else { + // Use the min of the average Q and active_worst_quality as basis for + // active_best. + if (cm->current_video_frame > 1) { + q = VPXMIN(rc->avg_frame_qindex[INTER_FRAME], active_worst_quality); + active_best_quality = inter_minq[q]; + } else { + active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]]; + } + // For the constrained quality mode we don't want + // q to fall below the cq level. + if ((oxcf->rc_mode == VPX_CQ) && (active_best_quality < cq_level)) { + active_best_quality = cq_level; + } + } + } + + // Clip the active best and worst quality values to limits + active_best_quality = + clamp(active_best_quality, rc->best_quality, rc->worst_quality); + active_worst_quality = + clamp(active_worst_quality, active_best_quality, rc->worst_quality); + + *top_index = active_worst_quality; + *bottom_index = active_best_quality; + +#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY + { + int qdelta = 0; + vpx_clear_system_state(); + + // Limit Q range for the adaptive loop. + if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced && + !(cm->current_video_frame == 0)) { + qdelta = vp9_compute_qdelta_by_rate( + &cpi->rc, cm->frame_type, active_worst_quality, 2.0, cm->bit_depth); + } else if (!rc->is_src_frame_alt_ref && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + qdelta = vp9_compute_qdelta_by_rate( + &cpi->rc, cm->frame_type, active_worst_quality, 1.75, cm->bit_depth); + } + if (rc->high_source_sad && cpi->sf.use_altref_onepass) qdelta = 0; + *top_index = active_worst_quality + qdelta; + *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index; + } +#endif + + if (oxcf->rc_mode == VPX_Q) { + q = active_best_quality; + // Special case code to try and match quality with forced key frames + } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) { + q = rc->last_boosted_qindex; + } else { + q = vp9_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, + active_worst_quality); + if (q > *top_index) { + // Special case when we are targeting the max allowed rate + if (rc->this_frame_target >= rc->max_frame_bandwidth) + *top_index = q; + else + q = *top_index; + } + } + + assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); + assert(*bottom_index <= rc->worst_quality && + *bottom_index >= rc->best_quality); + assert(q <= rc->worst_quality && q >= rc->best_quality); + return q; +} + +int vp9_frame_type_qdelta(const VP9_COMP *cpi, int rf_level, int q) { + static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = { + 1.00, // INTER_NORMAL + 1.00, // INTER_HIGH + 1.50, // GF_ARF_LOW + 1.75, // GF_ARF_STD + 2.00, // KF_STD + }; + const VP9_COMMON *const cm = &cpi->common; + + int qdelta = vp9_compute_qdelta_by_rate( + &cpi->rc, cm->frame_type, q, rate_factor_deltas[rf_level], cm->bit_depth); + return qdelta; +} + +#define STATIC_MOTION_THRESH 95 + +static void pick_kf_q_bound_two_pass(const VP9_COMP *cpi, int *bottom_index, + int *top_index) { + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + int active_best_quality; + int active_worst_quality = cpi->twopass.active_worst_quality; + + if (rc->this_key_frame_forced) { + // Handle the special case for key frames forced when we have reached + // the maximum key frame interval. Here force the Q to a range + // based on the ambient Q to reduce the risk of popping. + double last_boosted_q; + int delta_qindex; + int qindex; + + if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { + qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex); + active_best_quality = qindex; + last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + delta_qindex = vp9_compute_qdelta(rc, last_boosted_q, + last_boosted_q * 1.25, cm->bit_depth); + active_worst_quality = + VPXMIN(qindex + delta_qindex, active_worst_quality); + } else { + qindex = rc->last_boosted_qindex; + last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth); + delta_qindex = vp9_compute_qdelta(rc, last_boosted_q, + last_boosted_q * 0.75, cm->bit_depth); + active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); + } + } else { + // Not forced keyframe. + double q_adj_factor = 1.0; + double q_val; + // Baseline value derived from cpi->active_worst_quality and kf boost. + active_best_quality = + get_kf_active_quality(rc, active_worst_quality, cm->bit_depth); + if (cpi->twopass.kf_zeromotion_pct >= STATIC_KF_GROUP_THRESH) { + active_best_quality /= 4; + } + + // Don't allow the active min to be lossless (q0) unlesss the max q + // already indicates lossless. + active_best_quality = + VPXMIN(active_worst_quality, VPXMAX(1, active_best_quality)); + + // Allow somewhat lower kf minq with small image formats. + if ((cm->width * cm->height) <= (352 * 288)) { + q_adj_factor -= 0.25; + } + + // Make a further adjustment based on the kf zero motion measure. + q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct); + + // Convert the adjustment factor to a qindex delta + // on active_best_quality. + q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth); + active_best_quality += + vp9_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth); + } + *top_index = active_worst_quality; + *bottom_index = active_best_quality; +} + +static int rc_constant_q(const VP9_COMP *cpi, int *bottom_index, int *top_index, + int gf_group_index) { + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + const GF_GROUP *gf_group = &cpi->twopass.gf_group; + const int is_intra_frame = frame_is_intra_only(cm); + + const int cq_level = get_active_cq_level_two_pass(&cpi->twopass, rc, oxcf); + + int q = cq_level; + int active_best_quality = cq_level; + int active_worst_quality = cq_level; + + // Key frame qp decision + if (is_intra_frame && rc->frames_to_key > 1) + pick_kf_q_bound_two_pass(cpi, &active_best_quality, &active_worst_quality); + + // ARF / GF qp decision + if (!is_intra_frame && !rc->is_src_frame_alt_ref && + cpi->refresh_alt_ref_frame) { + active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth); + + // Modify best quality for second level arfs. For mode VPX_Q this + // becomes the baseline frame q. + if (gf_group->rf_level[gf_group_index] == GF_ARF_LOW) { + const int layer_depth = gf_group->layer_depth[gf_group_index]; + // linearly fit the frame q depending on the layer depth index from + // the base layer ARF. + active_best_quality = ((layer_depth - 1) * cq_level + + active_best_quality + layer_depth / 2) / + layer_depth; + } + } + + q = active_best_quality; + *top_index = active_worst_quality; + *bottom_index = active_best_quality; + return q; +} + +static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi, int *bottom_index, + int *top_index, int gf_group_index) { + const VP9_COMMON *const cm = &cpi->common; + const RATE_CONTROL *const rc = &cpi->rc; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + const GF_GROUP *gf_group = &cpi->twopass.gf_group; + const int cq_level = get_active_cq_level_two_pass(&cpi->twopass, rc, oxcf); + int active_best_quality; + int active_worst_quality = cpi->twopass.active_worst_quality; + int q; + int *inter_minq; + int arf_active_best_quality_hl; + int *arfgf_high_motion_minq, *arfgf_low_motion_minq; + const int boost_frame = + !rc->is_src_frame_alt_ref && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame); + + ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq); + + if (oxcf->rc_mode == VPX_Q) + return rc_constant_q(cpi, bottom_index, top_index, gf_group_index); + + if (frame_is_intra_only(cm)) { + pick_kf_q_bound_two_pass(cpi, &active_best_quality, &active_worst_quality); + } else if (boost_frame) { + // Use the lower of active_worst_quality and recent + // average Q as basis for GF/ARF best Q limit unless last frame was + // a key frame. + if (rc->frames_since_key > 1 && + rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { + q = rc->avg_frame_qindex[INTER_FRAME]; + } else { + q = active_worst_quality; + } + // For constrained quality don't allow Q less than the cq level + if (oxcf->rc_mode == VPX_CQ) { + if (q < cq_level) q = cq_level; + } + active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth); + arf_active_best_quality_hl = active_best_quality; + + if (rc->arf_increase_active_best_quality == 1) { + ASSIGN_MINQ_TABLE(cm->bit_depth, arfgf_high_motion_minq); + arf_active_best_quality_hl = arfgf_high_motion_minq[q]; + } else if (rc->arf_increase_active_best_quality == -1) { + ASSIGN_MINQ_TABLE(cm->bit_depth, arfgf_low_motion_minq); + arf_active_best_quality_hl = arfgf_low_motion_minq[q]; + } + active_best_quality = + (int)((double)active_best_quality * + rc->arf_active_best_quality_adjustment_factor + + (double)arf_active_best_quality_hl * + (1.0 - rc->arf_active_best_quality_adjustment_factor)); + + // Modify best quality for second level arfs. For mode VPX_Q this + // becomes the baseline frame q. + if (gf_group->rf_level[gf_group_index] == GF_ARF_LOW) { + const int layer_depth = gf_group->layer_depth[gf_group_index]; + // linearly fit the frame q depending on the layer depth index from + // the base layer ARF. + active_best_quality = + ((layer_depth - 1) * q + active_best_quality + layer_depth / 2) / + layer_depth; + } + } else { + active_best_quality = inter_minq[active_worst_quality]; + + // For the constrained quality mode we don't want + // q to fall below the cq level. + if ((oxcf->rc_mode == VPX_CQ) && (active_best_quality < cq_level)) { + active_best_quality = cq_level; + } + } + + // Extension to max or min Q if undershoot or overshoot is outside + // the permitted range. + if (frame_is_intra_only(cm) || boost_frame) { + const int layer_depth = gf_group->layer_depth[gf_group_index]; + active_best_quality -= + (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast); + active_worst_quality += (cpi->twopass.extend_maxq / 2); + + if (gf_group->rf_level[gf_group_index] == GF_ARF_LOW) { + assert(layer_depth > 1); + active_best_quality = + VPXMAX(active_best_quality, + cpi->twopass.last_qindex_of_arf_layer[layer_depth - 1]); + } + } else { + const int max_layer_depth = gf_group->max_layer_depth; + assert(max_layer_depth > 0); + + active_best_quality -= + (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2; + active_worst_quality += cpi->twopass.extend_maxq; + + // For normal frames do not allow an active minq lower than the q used for + // the last boosted frame. + active_best_quality = + VPXMAX(active_best_quality, + cpi->twopass.last_qindex_of_arf_layer[max_layer_depth - 1]); + } + +#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY + vpx_clear_system_state(); + // Static forced key frames Q restrictions dealt with elsewhere. + if (!frame_is_intra_only(cm) || !rc->this_key_frame_forced || + cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH) { + int qdelta = vp9_frame_type_qdelta(cpi, gf_group->rf_level[gf_group_index], + active_worst_quality); + active_worst_quality = + VPXMAX(active_worst_quality + qdelta, active_best_quality); + } +#endif + + // Modify active_best_quality for downscaled normal frames. + if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) { + int qdelta = vp9_compute_qdelta_by_rate( + rc, cm->frame_type, active_best_quality, 2.0, cm->bit_depth); + active_best_quality = + VPXMAX(active_best_quality + qdelta, rc->best_quality); + } + + active_best_quality = + clamp(active_best_quality, rc->best_quality, rc->worst_quality); + active_worst_quality = + clamp(active_worst_quality, active_best_quality, rc->worst_quality); + + if (frame_is_intra_only(cm) && rc->this_key_frame_forced) { + // If static since last kf use better of last boosted and last kf q. + if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { + q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex); + } else { + q = rc->last_boosted_qindex; + } + } else if (frame_is_intra_only(cm) && !rc->this_key_frame_forced) { + q = active_best_quality; + } else { + q = vp9_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, + active_worst_quality); + if (q > active_worst_quality) { + // Special case when we are targeting the max allowed rate. + if (rc->this_frame_target >= rc->max_frame_bandwidth) + active_worst_quality = q; + else + q = active_worst_quality; + } + } + clamp(q, active_best_quality, active_worst_quality); + + *top_index = active_worst_quality; + *bottom_index = active_best_quality; + + assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); + assert(*bottom_index <= rc->worst_quality && + *bottom_index >= rc->best_quality); + assert(q <= rc->worst_quality && q >= rc->best_quality); + return q; +} + +int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi, int *bottom_index, + int *top_index) { + int q; + const int gf_group_index = cpi->twopass.gf_group.index; + if (cpi->oxcf.pass == 0) { + if (cpi->oxcf.rc_mode == VPX_CBR) + q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index); + else + q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index); + } else { + q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index, + gf_group_index); + } + if (cpi->sf.use_nonrd_pick_mode) { + if (cpi->sf.force_frame_boost == 1) q -= cpi->sf.max_delta_qindex; + + if (q < *bottom_index) + *bottom_index = q; + else if (q > *top_index) + *top_index = q; + } + return q; +} + +void vp9_configure_buffer_updates(VP9_COMP *cpi, int gf_group_index) { + VP9_COMMON *cm = &cpi->common; + TWO_PASS *const twopass = &cpi->twopass; + + cpi->rc.is_src_frame_alt_ref = 0; + cm->show_existing_frame = 0; + cpi->rc.show_arf_as_gld = 0; + switch (twopass->gf_group.update_type[gf_group_index]) { + case KF_UPDATE: + cpi->refresh_last_frame = 1; + cpi->refresh_golden_frame = 1; + cpi->refresh_alt_ref_frame = 1; + break; + case LF_UPDATE: + cpi->refresh_last_frame = 1; + cpi->refresh_golden_frame = 0; + cpi->refresh_alt_ref_frame = 0; + break; + case GF_UPDATE: + cpi->refresh_last_frame = 1; + cpi->refresh_golden_frame = 1; + cpi->refresh_alt_ref_frame = 0; + break; + case OVERLAY_UPDATE: + cpi->refresh_last_frame = 0; + cpi->refresh_golden_frame = 1; + cpi->refresh_alt_ref_frame = 0; + cpi->rc.is_src_frame_alt_ref = 1; + if (cpi->rc.preserve_arf_as_gld) { + cpi->rc.show_arf_as_gld = 1; + cpi->refresh_golden_frame = 0; + cm->show_existing_frame = 1; + cm->refresh_frame_context = 0; + } + break; + case MID_OVERLAY_UPDATE: + cpi->refresh_last_frame = 1; + cpi->refresh_golden_frame = 0; + cpi->refresh_alt_ref_frame = 0; + cpi->rc.is_src_frame_alt_ref = 1; + break; + case USE_BUF_FRAME: + cpi->refresh_last_frame = 0; + cpi->refresh_golden_frame = 0; + cpi->refresh_alt_ref_frame = 0; + cpi->rc.is_src_frame_alt_ref = 1; + cm->show_existing_frame = 1; + cm->refresh_frame_context = 0; + break; + default: + assert(twopass->gf_group.update_type[gf_group_index] == ARF_UPDATE); + cpi->refresh_last_frame = 0; + cpi->refresh_golden_frame = 0; + cpi->refresh_alt_ref_frame = 1; + break; + } +} + +void vp9_estimate_qp_gop(VP9_COMP *cpi) { + int gop_length = cpi->twopass.gf_group.gf_group_size; + int bottom_index, top_index; + int idx; + const int gf_index = cpi->twopass.gf_group.index; + const int is_src_frame_alt_ref = cpi->rc.is_src_frame_alt_ref; + const int refresh_frame_context = cpi->common.refresh_frame_context; + + for (idx = 1; idx <= gop_length; ++idx) { + TplDepFrame *tpl_frame = &cpi->tpl_stats[idx]; + int target_rate = cpi->twopass.gf_group.bit_allocation[idx]; + cpi->twopass.gf_group.index = idx; + vp9_rc_set_frame_target(cpi, target_rate); + vp9_configure_buffer_updates(cpi, idx); + if (cpi->tpl_with_external_rc) { + if (cpi->ext_ratectrl.ready && + (cpi->ext_ratectrl.funcs.rc_type & VPX_RC_QP) != 0 && + cpi->ext_ratectrl.funcs.get_encodeframe_decision != NULL) { + VP9_COMMON *cm = &cpi->common; + vpx_codec_err_t codec_status; + const GF_GROUP *gf_group = &cpi->twopass.gf_group; + vpx_rc_encodeframe_decision_t encode_frame_decision; + FRAME_UPDATE_TYPE update_type = gf_group->update_type[gf_group->index]; + RefCntBuffer *ref_frame_bufs[MAX_INTER_REF_FRAMES]; + const RefCntBuffer *curr_frame_buf = + get_ref_cnt_buffer(cm, cm->new_fb_idx); + // index 0 of a gf group is always KEY/OVERLAY/GOLDEN. + // index 1 refers to the first encoding frame in a gf group. + // Therefore if it is ARF_UPDATE, it means this gf group uses alt ref. + // See function define_gf_group_structure(). + const int use_alt_ref = gf_group->update_type[1] == ARF_UPDATE; + const int frame_coding_index = cm->current_frame_coding_index + idx - 1; + get_ref_frame_bufs(cpi, ref_frame_bufs); + codec_status = vp9_extrc_get_encodeframe_decision( + &cpi->ext_ratectrl, curr_frame_buf->frame_index, frame_coding_index, + gf_group->index, update_type, gf_group->gf_group_size, use_alt_ref, + ref_frame_bufs, 0 /*ref_frame_flags is not used*/, + &encode_frame_decision); + if (codec_status != VPX_CODEC_OK) { + vpx_internal_error(&cm->error, codec_status, + "vp9_extrc_get_encodeframe_decision() failed"); + } + tpl_frame->base_qindex = encode_frame_decision.q_index; + } + } else { + tpl_frame->base_qindex = + rc_pick_q_and_bounds_two_pass(cpi, &bottom_index, &top_index, idx); + tpl_frame->base_qindex = VPXMAX(tpl_frame->base_qindex, 1); + } + } + // Reset the actual index and frame update + cpi->twopass.gf_group.index = gf_index; + cpi->rc.is_src_frame_alt_ref = is_src_frame_alt_ref; + cpi->common.refresh_frame_context = refresh_frame_context; + vp9_configure_buffer_updates(cpi, gf_index); +} + +void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi, int frame_target, + int *frame_under_shoot_limit, + int *frame_over_shoot_limit) { + if (cpi->oxcf.rc_mode == VPX_Q) { + *frame_under_shoot_limit = 0; + *frame_over_shoot_limit = INT_MAX; + } else { + // For very small rate targets where the fractional adjustment + // may be tiny make sure there is at least a minimum range. + const int tol_low = + (int)(((int64_t)cpi->sf.recode_tolerance_low * frame_target) / 100); + const int tol_high = + (int)(((int64_t)cpi->sf.recode_tolerance_high * frame_target) / 100); + *frame_under_shoot_limit = VPXMAX(frame_target - tol_low - 100, 0); + *frame_over_shoot_limit = + VPXMIN(frame_target + tol_high + 100, cpi->rc.max_frame_bandwidth); + } +} + +void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) { + const VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + + rc->this_frame_target = target; + + // Modify frame size target when down-scaling. + if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC && + rc->frame_size_selector != UNSCALED) { + rc->this_frame_target = (int)(rc->this_frame_target * + rate_thresh_mult[rc->frame_size_selector]); + } + +#if CONFIG_RATE_CTRL + if (cpi->oxcf.use_simple_encode_api) { + if (cpi->encode_command.use_external_target_frame_bits) { + rc->this_frame_target = cpi->encode_command.target_frame_bits; + } + } +#endif // CONFIG_RATE_CTRL + + // Target rate per SB64 (including partial SB64s. + rc->sb64_target_rate = (int)(((int64_t)rc->this_frame_target * 64 * 64) / + (cm->width * cm->height)); +} + +static void update_alt_ref_frame_stats(VP9_COMP *cpi) { + // this frame refreshes means next frames don't unless specified by user + RATE_CONTROL *const rc = &cpi->rc; + rc->frames_since_golden = 0; + + // Mark the alt ref as done (setting to 0 means no further alt refs pending). + rc->source_alt_ref_pending = 0; + + // Set the alternate reference frame active flag + rc->source_alt_ref_active = 1; +} + +static void update_golden_frame_stats(VP9_COMP *cpi) { + RATE_CONTROL *const rc = &cpi->rc; + + // Update the Golden frame usage counts. + if (cpi->refresh_golden_frame) { + // this frame refreshes means next frames don't unless specified by user + rc->frames_since_golden = 0; + + // If we are not using alt ref in the up and coming group clear the arf + // active flag. In multi arf group case, if the index is not 0 then + // we are overlaying a mid group arf so should not reset the flag. + if (cpi->oxcf.pass == 2) { + if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0)) + rc->source_alt_ref_active = 0; + } else if (!rc->source_alt_ref_pending) { + rc->source_alt_ref_active = 0; + } + + // Decrement count down till next gf + if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--; + + } else if (!cpi->refresh_alt_ref_frame) { + // Decrement count down till next gf + if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--; + + rc->frames_since_golden++; + + if (rc->show_arf_as_gld) { + rc->frames_since_golden = 0; + // If we are not using alt ref in the up and coming group clear the arf + // active flag. In multi arf group case, if the index is not 0 then + // we are overlaying a mid group arf so should not reset the flag. + if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0)) + rc->source_alt_ref_active = 0; + } + } +} + +static void update_altref_usage(VP9_COMP *const cpi) { + VP9_COMMON *const cm = &cpi->common; + int sum_ref_frame_usage = 0; + int arf_frame_usage = 0; + int mi_row, mi_col; + if (cpi->rc.alt_ref_gf_group && !cpi->rc.is_src_frame_alt_ref && + !cpi->refresh_golden_frame && !cpi->refresh_alt_ref_frame) + for (mi_row = 0; mi_row < cm->mi_rows; mi_row += 8) { + for (mi_col = 0; mi_col < cm->mi_cols; mi_col += 8) { + int sboffset = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3); + sum_ref_frame_usage += cpi->count_arf_frame_usage[sboffset] + + cpi->count_lastgolden_frame_usage[sboffset]; + arf_frame_usage += cpi->count_arf_frame_usage[sboffset]; + } + } + if (sum_ref_frame_usage > 0) { + double altref_count = 100.0 * arf_frame_usage / sum_ref_frame_usage; + cpi->rc.perc_arf_usage = + 0.75 * cpi->rc.perc_arf_usage + 0.25 * altref_count; + } +} + +void vp9_compute_frame_low_motion(VP9_COMP *const cpi) { + VP9_COMMON *const cm = &cpi->common; + SVC *const svc = &cpi->svc; + int mi_row, mi_col; + MODE_INFO **mi = cm->mi_grid_visible; + RATE_CONTROL *const rc = &cpi->rc; + const int rows = cm->mi_rows, cols = cm->mi_cols; + int cnt_zeromv = 0; + for (mi_row = 0; mi_row < rows; mi_row++) { + for (mi_col = 0; mi_col < cols; mi_col++) { + if (mi[0]->ref_frame[0] == LAST_FRAME && + abs(mi[0]->mv[0].as_mv.row) < 16 && abs(mi[0]->mv[0].as_mv.col) < 16) + cnt_zeromv++; + mi++; + } + mi += 8; + } + cnt_zeromv = 100 * cnt_zeromv / (rows * cols); + rc->avg_frame_low_motion = (3 * rc->avg_frame_low_motion + cnt_zeromv) >> 2; + + // For SVC: set avg_frame_low_motion (only computed on top spatial layer) + // to all lower spatial layers. + if (cpi->use_svc && svc->spatial_layer_id == svc->number_spatial_layers - 1) { + int i; + for (i = 0; i < svc->number_spatial_layers - 1; ++i) { + const int layer = LAYER_IDS_TO_IDX(i, svc->temporal_layer_id, + svc->number_temporal_layers); + LAYER_CONTEXT *const lc = &svc->layer_context[layer]; + RATE_CONTROL *const lrc = &lc->rc; + lrc->avg_frame_low_motion = rc->avg_frame_low_motion; + } + } +} + +void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) { + const VP9_COMMON *const cm = &cpi->common; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + SVC *const svc = &cpi->svc; + const int qindex = cm->base_qindex; + const GF_GROUP *gf_group = &cpi->twopass.gf_group; + const int gf_group_index = cpi->twopass.gf_group.index; + const int layer_depth = gf_group->layer_depth[gf_group_index]; + + // Update rate control heuristics + rc->projected_frame_size = (int)(bytes_used << 3); + + // Post encode loop adjustment of Q prediction. + vp9_rc_update_rate_correction_factors(cpi); + + // Keep a record of last Q and ambient average Q. + if (frame_is_intra_only(cm)) { + rc->last_q[KEY_FRAME] = qindex; + rc->avg_frame_qindex[KEY_FRAME] = + ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2); + if (cpi->use_svc) { + int i; + for (i = 0; i < svc->number_temporal_layers; ++i) { + const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, + svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + lrc->last_q[KEY_FRAME] = rc->last_q[KEY_FRAME]; + lrc->avg_frame_qindex[KEY_FRAME] = rc->avg_frame_qindex[KEY_FRAME]; + } + } + } else { + if ((cpi->use_svc) || + (!rc->is_src_frame_alt_ref && + !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) { + rc->last_q[INTER_FRAME] = qindex; + rc->avg_frame_qindex[INTER_FRAME] = + ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2); + rc->ni_frames++; + rc->tot_q += vp9_convert_qindex_to_q(qindex, cm->bit_depth); + rc->avg_q = rc->tot_q / rc->ni_frames; + // Calculate the average Q for normal inter frames (not key or GFU + // frames). + rc->ni_tot_qi += qindex; + rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames; + } + } + + if (cpi->use_svc) vp9_svc_adjust_avg_frame_qindex(cpi); + + // Keep record of last boosted (KF/KF/ARF) Q value. + // If the current frame is coded at a lower Q then we also update it. + // If all mbs in this group are skipped only update if the Q value is + // better than that already stored. + // This is used to help set quality in forced key frames to reduce popping + if ((qindex < rc->last_boosted_qindex) || (cm->frame_type == KEY_FRAME) || + (!rc->constrained_gf_group && + (cpi->refresh_alt_ref_frame || + (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { + rc->last_boosted_qindex = qindex; + } + + if ((qindex < cpi->twopass.last_qindex_of_arf_layer[layer_depth]) || + (cm->frame_type == KEY_FRAME) || + (!rc->constrained_gf_group && + (cpi->refresh_alt_ref_frame || + (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { + cpi->twopass.last_qindex_of_arf_layer[layer_depth] = qindex; + } + + if (frame_is_intra_only(cm)) rc->last_kf_qindex = qindex; + + update_buffer_level_postencode(cpi, rc->projected_frame_size); + + // Rolling monitors of whether we are over or underspending used to help + // regulate min and Max Q in two pass. + if (!frame_is_intra_only(cm)) { + rc->rolling_target_bits = (int)ROUND64_POWER_OF_TWO( + (int64_t)rc->rolling_target_bits * 3 + rc->this_frame_target, 2); + rc->rolling_actual_bits = (int)ROUND64_POWER_OF_TWO( + (int64_t)rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2); + rc->long_rolling_target_bits = (int)ROUND64_POWER_OF_TWO( + (int64_t)rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5); + rc->long_rolling_actual_bits = (int)ROUND64_POWER_OF_TWO( + (int64_t)rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, + 5); + } + + // Actual bits spent + rc->total_actual_bits += rc->projected_frame_size; + rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0; + + rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits; + + if (!cpi->use_svc) { + if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame && + (!frame_is_intra_only(cm))) + // Update the alternate reference frame stats as appropriate. + update_alt_ref_frame_stats(cpi); + else + // Update the Golden frame stats as appropriate. + update_golden_frame_stats(cpi); + } + + // If second (long term) temporal reference is used for SVC, + // update the golden frame counter, only for base temporal layer. + if (cpi->use_svc && svc->use_gf_temporal_ref_current_layer && + svc->temporal_layer_id == 0) { + int i = 0; + if (cpi->refresh_golden_frame) + rc->frames_since_golden = 0; + else + rc->frames_since_golden++; + // Decrement count down till next gf + if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--; + // Update the frames_since_golden for all upper temporal layers. + for (i = 1; i < svc->number_temporal_layers; ++i) { + const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, + svc->number_temporal_layers); + LAYER_CONTEXT *const lc = &svc->layer_context[layer]; + RATE_CONTROL *const lrc = &lc->rc; + lrc->frames_since_golden = rc->frames_since_golden; + } + } + + if (frame_is_intra_only(cm)) rc->frames_since_key = 0; + if (cm->show_frame) { + rc->frames_since_key++; + rc->frames_to_key--; + } + + // Trigger the resizing of the next frame if it is scaled. + if (oxcf->pass != 0) { + cpi->resize_pending = + rc->next_frame_size_selector != rc->frame_size_selector; + rc->frame_size_selector = rc->next_frame_size_selector; + } + + if (oxcf->pass == 0) { + if (!frame_is_intra_only(cm)) + if (cpi->sf.use_altref_onepass) update_altref_usage(cpi); + cpi->rc.last_frame_is_src_altref = cpi->rc.is_src_frame_alt_ref; + } + + if (!frame_is_intra_only(cm)) rc->reset_high_source_sad = 0; + + rc->last_avg_frame_bandwidth = rc->avg_frame_bandwidth; + if (cpi->use_svc && svc->spatial_layer_id < svc->number_spatial_layers - 1) + svc->lower_layer_qindex = cm->base_qindex; + cpi->deadline_mode_previous_frame = cpi->oxcf.mode; +} + +void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) { + cpi->common.current_video_frame++; + cpi->rc.frames_since_key++; + cpi->rc.frames_to_key--; + cpi->rc.rc_2_frame = 0; + cpi->rc.rc_1_frame = 0; + cpi->rc.last_avg_frame_bandwidth = cpi->rc.avg_frame_bandwidth; + cpi->rc.last_q[INTER_FRAME] = cpi->common.base_qindex; + // For SVC on dropped frame when framedrop_mode != LAYER_DROP: + // in this mode the whole superframe may be dropped if only a single layer + // has buffer underflow (below threshold). Since this can then lead to + // increasing buffer levels/overflow for certain layers even though whole + // superframe is dropped, we cap buffer level if its already stable. + if (cpi->use_svc && cpi->svc.framedrop_mode != LAYER_DROP && + cpi->rc.buffer_level > cpi->rc.optimal_buffer_level) { + cpi->rc.buffer_level = cpi->rc.optimal_buffer_level; + cpi->rc.bits_off_target = cpi->rc.optimal_buffer_level; + } + cpi->deadline_mode_previous_frame = cpi->oxcf.mode; +} + +int vp9_calc_pframe_target_size_one_pass_vbr(const VP9_COMP *cpi) { + const RATE_CONTROL *const rc = &cpi->rc; + const int af_ratio = rc->af_ratio_onepass_vbr; + int64_t target = + (!rc->is_src_frame_alt_ref && + (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) + ? ((int64_t)rc->avg_frame_bandwidth * rc->baseline_gf_interval * + af_ratio) / + (rc->baseline_gf_interval + af_ratio - 1) + : ((int64_t)rc->avg_frame_bandwidth * rc->baseline_gf_interval) / + (rc->baseline_gf_interval + af_ratio - 1); + // For SVC: refresh flags are used to define the pattern, so we can't + // use that for boosting the target size here. + // TODO(marpan): Consider adding internal boost on TL0 for VBR-SVC. + // For now just use the CBR logic for setting target size. + if (cpi->use_svc) target = vp9_calc_pframe_target_size_one_pass_cbr(cpi); + if (target > INT_MAX) target = INT_MAX; + return vp9_rc_clamp_pframe_target_size(cpi, (int)target); +} + +int vp9_calc_iframe_target_size_one_pass_vbr(const VP9_COMP *cpi) { + static const int kf_ratio = 25; + const RATE_CONTROL *rc = &cpi->rc; + int target = rc->avg_frame_bandwidth; + if (target > INT_MAX / kf_ratio) + target = INT_MAX; + else + target = rc->avg_frame_bandwidth * kf_ratio; + return vp9_rc_clamp_iframe_target_size(cpi, target); +} + +static void adjust_gfint_frame_constraint(VP9_COMP *cpi, int frame_constraint) { + RATE_CONTROL *const rc = &cpi->rc; + rc->constrained_gf_group = 0; + // Reset gf interval to make more equal spacing for frame_constraint. + if ((frame_constraint <= 7 * rc->baseline_gf_interval >> 2) && + (frame_constraint > rc->baseline_gf_interval)) { + rc->baseline_gf_interval = frame_constraint >> 1; + if (rc->baseline_gf_interval < 5) + rc->baseline_gf_interval = frame_constraint; + rc->constrained_gf_group = 1; + } else { + // Reset to keep gf_interval <= frame_constraint. + if (rc->baseline_gf_interval > frame_constraint) { + rc->baseline_gf_interval = frame_constraint; + rc->constrained_gf_group = 1; + } + } +} + +void vp9_set_gf_update_one_pass_vbr(VP9_COMP *const cpi) { + RATE_CONTROL *const rc = &cpi->rc; + VP9_COMMON *const cm = &cpi->common; + if (rc->frames_till_gf_update_due == 0) { + double rate_err = 1.0; + rc->gfu_boost = DEFAULT_GF_BOOST; + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.pass == 0) { + vp9_cyclic_refresh_set_golden_update(cpi); + } else { + rc->baseline_gf_interval = VPXMIN( + 20, VPXMAX(10, (rc->min_gf_interval + rc->max_gf_interval) / 2)); + } + rc->af_ratio_onepass_vbr = 10; + if (rc->rolling_target_bits > 0) + rate_err = + (double)rc->rolling_actual_bits / (double)rc->rolling_target_bits; + if (cm->current_video_frame > 30) { + if (rc->avg_frame_qindex[INTER_FRAME] > (7 * rc->worst_quality) >> 3 && + rate_err > 3.5) { + rc->baseline_gf_interval = + VPXMIN(15, (3 * rc->baseline_gf_interval) >> 1); + } else if (rc->avg_frame_low_motion > 0 && + rc->avg_frame_low_motion < 20) { + // Decrease gf interval for high motion case. + rc->baseline_gf_interval = VPXMAX(6, rc->baseline_gf_interval >> 1); + } + // Adjust boost and af_ratio based on avg_frame_low_motion, which + // varies between 0 and 100 (stationary, 100% zero/small motion). + if (rc->avg_frame_low_motion > 0) + rc->gfu_boost = + VPXMAX(500, DEFAULT_GF_BOOST * (rc->avg_frame_low_motion << 1) / + (rc->avg_frame_low_motion + 100)); + else if (rc->avg_frame_low_motion == 0 && rate_err > 1.0) + rc->gfu_boost = DEFAULT_GF_BOOST >> 1; + rc->af_ratio_onepass_vbr = VPXMIN(15, VPXMAX(5, 3 * rc->gfu_boost / 400)); + } + if (rc->constrain_gf_key_freq_onepass_vbr) + adjust_gfint_frame_constraint(cpi, rc->frames_to_key); + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + cpi->refresh_golden_frame = 1; + rc->source_alt_ref_pending = 0; + rc->alt_ref_gf_group = 0; + if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf) { + rc->source_alt_ref_pending = 1; + rc->alt_ref_gf_group = 1; + } + } +} + +void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + int target; + if (!cpi->refresh_alt_ref_frame && + (cm->current_video_frame == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY) || + rc->frames_to_key == 0 || + (cpi->oxcf.mode != cpi->deadline_mode_previous_frame))) { + cm->frame_type = KEY_FRAME; + rc->this_key_frame_forced = + cm->current_video_frame != 0 && rc->frames_to_key == 0; + rc->frames_to_key = cpi->oxcf.key_freq; + rc->kf_boost = DEFAULT_KF_BOOST; + rc->source_alt_ref_active = 0; + } else { + cm->frame_type = INTER_FRAME; + } + vp9_set_gf_update_one_pass_vbr(cpi); + if (cm->frame_type == KEY_FRAME) + target = vp9_calc_iframe_target_size_one_pass_vbr(cpi); + else + target = vp9_calc_pframe_target_size_one_pass_vbr(cpi); + vp9_rc_set_frame_target(cpi, target); + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.pass == 0) + vp9_cyclic_refresh_update_parameters(cpi); +} + +int vp9_calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) { + const VP9EncoderConfig *oxcf = &cpi->oxcf; + const RATE_CONTROL *rc = &cpi->rc; + const SVC *const svc = &cpi->svc; + const int64_t diff = rc->optimal_buffer_level - rc->buffer_level; + const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100; + int min_frame_target = + VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS); + int target; + + if (oxcf->gf_cbr_boost_pct) { + const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100; + target = cpi->refresh_golden_frame + ? (rc->avg_frame_bandwidth * rc->baseline_gf_interval * + af_ratio_pct) / + (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) + : (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) / + (rc->baseline_gf_interval * 100 + af_ratio_pct - 100); + } else { + target = rc->avg_frame_bandwidth; + } + if (is_one_pass_svc(cpi)) { + // Note that for layers, avg_frame_bandwidth is the cumulative + // per-frame-bandwidth. For the target size of this frame, use the + // layer average frame size (i.e., non-cumulative per-frame-bw). + int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id, + svc->number_temporal_layers); + const LAYER_CONTEXT *lc = &svc->layer_context[layer]; + target = lc->avg_frame_size; + min_frame_target = VPXMAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS); + } + if (diff > 0) { + // Lower the target bandwidth for this frame. + const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct); + target -= (int)(((int64_t)target * pct_low) / 200); + } else if (diff < 0) { + // Increase the target bandwidth for this frame. + const int pct_high = + (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct); + target += (int)(((int64_t)target * pct_high) / 200); + } + if (oxcf->rc_max_inter_bitrate_pct) { + const int max_rate = + rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100; + target = VPXMIN(target, max_rate); + } + return VPXMAX(min_frame_target, target); +} + +int vp9_calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) { + const RATE_CONTROL *rc = &cpi->rc; + const VP9EncoderConfig *oxcf = &cpi->oxcf; + const SVC *const svc = &cpi->svc; + int target; + if (cpi->common.current_video_frame == 0) { + target = ((rc->starting_buffer_level / 2) > INT_MAX) + ? INT_MAX + : (int)(rc->starting_buffer_level / 2); + } else { + int kf_boost = 32; + double framerate = cpi->framerate; + if (svc->number_temporal_layers > 1 && oxcf->rc_mode == VPX_CBR) { + // Use the layer framerate for temporal layers CBR mode. + const int layer = + LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id, + svc->number_temporal_layers); + const LAYER_CONTEXT *lc = &svc->layer_context[layer]; + framerate = lc->framerate; + } + kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16)); + if (rc->frames_since_key < framerate / 2) { + kf_boost = (int)(kf_boost * rc->frames_since_key / (framerate / 2)); + } + target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4; + } + return vp9_rc_clamp_iframe_target_size(cpi, target); +} + +static void set_intra_only_frame(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + SVC *const svc = &cpi->svc; + // Don't allow intra_only frame for bypass/flexible SVC mode, or if number + // of spatial layers is 1 or if number of spatial or temporal layers > 3. + // Also if intra-only is inserted on very first frame, don't allow if + // if number of temporal layers > 1. This is because on intra-only frame + // only 3 reference buffers can be updated, but for temporal layers > 1 + // we generally need to use buffer slots 4 and 5. + if ((cm->current_video_frame == 0 && svc->number_temporal_layers > 1) || + svc->number_spatial_layers > 3 || svc->number_temporal_layers > 3 || + svc->number_spatial_layers == 1) + return; + cm->show_frame = 0; + cm->intra_only = 1; + cm->frame_type = INTER_FRAME; + cpi->ext_refresh_frame_flags_pending = 1; + cpi->ext_refresh_last_frame = 1; + cpi->ext_refresh_golden_frame = 1; + cpi->ext_refresh_alt_ref_frame = 1; + if (cm->current_video_frame == 0) { + cpi->lst_fb_idx = 0; + cpi->gld_fb_idx = 1; + cpi->alt_fb_idx = 2; + } else { + int i; + int count = 0; + cpi->lst_fb_idx = -1; + cpi->gld_fb_idx = -1; + cpi->alt_fb_idx = -1; + svc->update_buffer_slot[0] = 0; + // For intra-only frame we need to refresh all slots that were + // being used for the base layer (fb_idx_base[i] == 1). + // Start with assigning last first, then golden and then alt. + for (i = 0; i < REF_FRAMES; ++i) { + if (svc->fb_idx_base[i] == 1) { + svc->update_buffer_slot[0] |= 1 << i; + count++; + } + if (count == 1 && cpi->lst_fb_idx == -1) cpi->lst_fb_idx = i; + if (count == 2 && cpi->gld_fb_idx == -1) cpi->gld_fb_idx = i; + if (count == 3 && cpi->alt_fb_idx == -1) cpi->alt_fb_idx = i; + } + // If golden or alt is not being used for base layer, then set them + // to the lst_fb_idx. + if (cpi->gld_fb_idx == -1) cpi->gld_fb_idx = cpi->lst_fb_idx; + if (cpi->alt_fb_idx == -1) cpi->alt_fb_idx = cpi->lst_fb_idx; + if (svc->temporal_layering_mode == VP9E_TEMPORAL_LAYERING_MODE_BYPASS) { + cpi->ext_refresh_last_frame = 0; + cpi->ext_refresh_golden_frame = 0; + cpi->ext_refresh_alt_ref_frame = 0; + cpi->ref_frame_flags = 0; + } + } +} + +void vp9_rc_get_svc_params(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + SVC *const svc = &cpi->svc; + int target = rc->avg_frame_bandwidth; + int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id, + svc->number_temporal_layers); + if (svc->first_spatial_layer_to_encode) + svc->layer_context[svc->temporal_layer_id].is_key_frame = 0; + // Periodic key frames is based on the super-frame counter + // (svc.current_superframe), also only base spatial layer is key frame. + // Key frame is set for any of the following: very first frame, frame flags + // indicates key, superframe counter hits key frequency,(non-intra) sync + // flag is set for spatial layer 0, or deadline mode changes. + if ((cm->current_video_frame == 0 && !svc->previous_frame_is_intra_only) || + (cpi->frame_flags & FRAMEFLAGS_KEY) || + (cpi->oxcf.auto_key && + (svc->current_superframe % cpi->oxcf.key_freq == 0) && + !svc->previous_frame_is_intra_only && svc->spatial_layer_id == 0) || + (svc->spatial_layer_sync[0] == 1 && svc->spatial_layer_id == 0) || + (cpi->oxcf.mode != cpi->deadline_mode_previous_frame)) { + cm->frame_type = KEY_FRAME; + rc->source_alt_ref_active = 0; + if (is_one_pass_svc(cpi)) { + if (cm->current_video_frame > 0) vp9_svc_reset_temporal_layers(cpi, 1); + layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id, + svc->number_temporal_layers); + svc->layer_context[layer].is_key_frame = 1; + cpi->ref_frame_flags &= (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG); + // Assumption here is that LAST_FRAME is being updated for a keyframe. + // Thus no change in update flags. + if (cpi->oxcf.rc_mode == VPX_CBR) + target = vp9_calc_iframe_target_size_one_pass_cbr(cpi); + else + target = vp9_calc_iframe_target_size_one_pass_vbr(cpi); + } + } else { + cm->frame_type = INTER_FRAME; + if (is_one_pass_svc(cpi)) { + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + // Add condition current_video_frame > 0 for the case where first frame + // is intra only followed by overlay/copy frame. In this case we don't + // want to reset is_key_frame to 0 on overlay/copy frame. + lc->is_key_frame = + (svc->spatial_layer_id == 0 && cm->current_video_frame > 0) + ? 0 + : svc->layer_context[svc->temporal_layer_id].is_key_frame; + if (cpi->oxcf.rc_mode == VPX_CBR) { + target = vp9_calc_pframe_target_size_one_pass_cbr(cpi); + } else { + double rate_err = 0.0; + rc->fac_active_worst_inter = 140; + rc->fac_active_worst_gf = 100; + if (rc->rolling_target_bits > 0) { + rate_err = + (double)rc->rolling_actual_bits / (double)rc->rolling_target_bits; + if (rate_err < 1.0) + rc->fac_active_worst_inter = 120; + else if (rate_err > 2.0) + // Increase active_worst faster if rate fluctuation is high. + rc->fac_active_worst_inter = 160; + } + target = vp9_calc_pframe_target_size_one_pass_vbr(cpi); + } + } + } + + if (svc->simulcast_mode) { + if (svc->spatial_layer_id > 0 && + svc->layer_context[layer].is_key_frame == 1) { + cm->frame_type = KEY_FRAME; + cpi->ref_frame_flags &= (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG); + if (cpi->oxcf.rc_mode == VPX_CBR) + target = vp9_calc_iframe_target_size_one_pass_cbr(cpi); + else + target = vp9_calc_iframe_target_size_one_pass_vbr(cpi); + } + // Set the buffer idx and refresh flags for key frames in simulcast mode. + // Note the buffer slot for long-term reference is set below (line 2255), + // and alt_ref is used for that on key frame. So use last and golden for + // the other two normal slots. + if (cm->frame_type == KEY_FRAME) { + if (svc->number_spatial_layers == 2) { + if (svc->spatial_layer_id == 0) { + cpi->lst_fb_idx = 0; + cpi->gld_fb_idx = 2; + cpi->alt_fb_idx = 6; + } else if (svc->spatial_layer_id == 1) { + cpi->lst_fb_idx = 1; + cpi->gld_fb_idx = 3; + cpi->alt_fb_idx = 6; + } + } else if (svc->number_spatial_layers == 3) { + if (svc->spatial_layer_id == 0) { + cpi->lst_fb_idx = 0; + cpi->gld_fb_idx = 3; + cpi->alt_fb_idx = 6; + } else if (svc->spatial_layer_id == 1) { + cpi->lst_fb_idx = 1; + cpi->gld_fb_idx = 4; + cpi->alt_fb_idx = 6; + } else if (svc->spatial_layer_id == 2) { + cpi->lst_fb_idx = 2; + cpi->gld_fb_idx = 5; + cpi->alt_fb_idx = 7; + } + } + cpi->ext_refresh_last_frame = 1; + cpi->ext_refresh_golden_frame = 1; + cpi->ext_refresh_alt_ref_frame = 1; + } + } + + // Check if superframe contains a sync layer request. + vp9_svc_check_spatial_layer_sync(cpi); + + // If long term termporal feature is enabled, set the period of the update. + // The update/refresh of this reference frame is always on base temporal + // layer frame. + if (svc->use_gf_temporal_ref_current_layer) { + // Only use gf long-term prediction on non-key superframes. + if (!svc->layer_context[svc->temporal_layer_id].is_key_frame) { + // Use golden for this reference, which will be used for prediction. + int index = svc->spatial_layer_id; + if (svc->number_spatial_layers == 3) index = svc->spatial_layer_id - 1; + assert(index >= 0); + cpi->gld_fb_idx = svc->buffer_gf_temporal_ref[index].idx; + // Enable prediction off LAST (last reference) and golden (which will + // generally be further behind/long-term reference). + cpi->ref_frame_flags = VP9_LAST_FLAG | VP9_GOLD_FLAG; + } + // Check for update/refresh of reference: only refresh on base temporal + // layer. + if (svc->temporal_layer_id == 0) { + if (svc->layer_context[svc->temporal_layer_id].is_key_frame) { + // On key frame we update the buffer index used for long term reference. + // Use the alt_ref since it is not used or updated on key frames. + int index = svc->spatial_layer_id; + if (svc->number_spatial_layers == 3) index = svc->spatial_layer_id - 1; + assert(index >= 0); + cpi->alt_fb_idx = svc->buffer_gf_temporal_ref[index].idx; + cpi->ext_refresh_alt_ref_frame = 1; + } else if (rc->frames_till_gf_update_due == 0) { + // Set perdiod of next update. Make it a multiple of 10, as the cyclic + // refresh is typically ~10%, and we'd like the update to happen after + // a few cylces of the refresh (so it better quality frame). Note the + // cyclic refresh for SVC only operates on base temporal layer frames. + // Choose 20 as perdiod for now (2 cycles). + rc->baseline_gf_interval = 20; + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + cpi->ext_refresh_golden_frame = 1; + rc->gfu_boost = DEFAULT_GF_BOOST; + } + } + } else if (!svc->use_gf_temporal_ref) { + rc->frames_till_gf_update_due = INT_MAX; + rc->baseline_gf_interval = INT_MAX; + } + if (svc->set_intra_only_frame) { + set_intra_only_frame(cpi); + if (cpi->oxcf.rc_mode == VPX_CBR) + target = vp9_calc_iframe_target_size_one_pass_cbr(cpi); + else + target = vp9_calc_iframe_target_size_one_pass_vbr(cpi); + } + // Overlay frame predicts from LAST (intra-only) + if (svc->previous_frame_is_intra_only) cpi->ref_frame_flags |= VP9_LAST_FLAG; + + // Any update/change of global cyclic refresh parameters (amount/delta-qp) + // should be done here, before the frame qp is selected. + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) + vp9_cyclic_refresh_update_parameters(cpi); + + vp9_rc_set_frame_target(cpi, target); + if (cm->show_frame) vp9_update_buffer_level_svc_preencode(cpi); + + if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC && svc->single_layer_svc == 1 && + svc->spatial_layer_id == svc->first_spatial_layer_to_encode && + svc->temporal_layer_id == 0) { + LAYER_CONTEXT *lc = NULL; + cpi->resize_pending = vp9_resize_one_pass_cbr(cpi); + if (cpi->resize_pending) { + int tl, width, height; + // Apply the same scale to all temporal layers. + for (tl = 0; tl < svc->number_temporal_layers; tl++) { + lc = &svc->layer_context[svc->spatial_layer_id * + svc->number_temporal_layers + + tl]; + lc->scaling_factor_num_resize = + cpi->resize_scale_num * lc->scaling_factor_num; + lc->scaling_factor_den_resize = + cpi->resize_scale_den * lc->scaling_factor_den; + // Reset rate control for all temporal layers. + lc->rc.buffer_level = lc->rc.optimal_buffer_level; + lc->rc.bits_off_target = lc->rc.optimal_buffer_level; + lc->rc.rate_correction_factors[INTER_FRAME] = + rc->rate_correction_factors[INTER_FRAME]; + } + // Set the size for this current temporal layer. + lc = &svc->layer_context[svc->spatial_layer_id * + svc->number_temporal_layers + + svc->temporal_layer_id]; + get_layer_resolution(cpi->oxcf.width, cpi->oxcf.height, + lc->scaling_factor_num_resize, + lc->scaling_factor_den_resize, &width, &height); + vp9_set_size_literal(cpi, width, height); + svc->resize_set = 1; + } + } else { + cpi->resize_pending = 0; + svc->resize_set = 0; + } +} + +void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + int target; + if ((cm->current_video_frame == 0) || (cpi->frame_flags & FRAMEFLAGS_KEY) || + (cpi->oxcf.auto_key && rc->frames_to_key == 0) || + (cpi->oxcf.mode != cpi->deadline_mode_previous_frame)) { + cm->frame_type = KEY_FRAME; + rc->frames_to_key = cpi->oxcf.key_freq; + rc->kf_boost = DEFAULT_KF_BOOST; + rc->source_alt_ref_active = 0; + } else { + cm->frame_type = INTER_FRAME; + } + if (rc->frames_till_gf_update_due == 0) { + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) + vp9_cyclic_refresh_set_golden_update(cpi); + else + rc->baseline_gf_interval = + (rc->min_gf_interval + rc->max_gf_interval) / 2; + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + // NOTE: frames_till_gf_update_due must be <= frames_to_key. + if (rc->frames_till_gf_update_due > rc->frames_to_key) + rc->frames_till_gf_update_due = rc->frames_to_key; + cpi->refresh_golden_frame = 1; + rc->gfu_boost = DEFAULT_GF_BOOST; + } + + // Any update/change of global cyclic refresh parameters (amount/delta-qp) + // should be done here, before the frame qp is selected. + if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) + vp9_cyclic_refresh_update_parameters(cpi); + + if (frame_is_intra_only(cm)) + target = vp9_calc_iframe_target_size_one_pass_cbr(cpi); + else + target = vp9_calc_pframe_target_size_one_pass_cbr(cpi); + + vp9_rc_set_frame_target(cpi, target); + + if (cm->show_frame) vp9_update_buffer_level_preencode(cpi); + + if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC) + cpi->resize_pending = vp9_resize_one_pass_cbr(cpi); + else + cpi->resize_pending = 0; +} + +int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, + vpx_bit_depth_t bit_depth) { + int start_index = rc->worst_quality; + int target_index = rc->worst_quality; + int i; + + // Convert the average q value to an index. + for (i = rc->best_quality; i < rc->worst_quality; ++i) { + start_index = i; + if (vp9_convert_qindex_to_q(i, bit_depth) >= qstart) break; + } + + // Convert the q target to an index + for (i = rc->best_quality; i < rc->worst_quality; ++i) { + target_index = i; + if (vp9_convert_qindex_to_q(i, bit_depth) >= qtarget) break; + } + + return target_index - start_index; +} + +int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, + int qindex, double rate_target_ratio, + vpx_bit_depth_t bit_depth) { + int target_index = rc->worst_quality; + int i; + + // Look up the current projected bits per block for the base index + const int base_bits_per_mb = + vp9_rc_bits_per_mb(frame_type, qindex, 1.0, bit_depth); + + // Find the target bits per mb based on the base value and given ratio. + const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb); + + // Convert the q target to an index + for (i = rc->best_quality; i < rc->worst_quality; ++i) { + if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <= + target_bits_per_mb) { + target_index = i; + break; + } + } + return target_index - qindex; +} + +void vp9_rc_set_gf_interval_range(const VP9_COMP *const cpi, + RATE_CONTROL *const rc) { + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + + // Special case code for 1 pass fixed Q mode tests + if ((oxcf->pass == 0) && (oxcf->rc_mode == VPX_Q)) { + rc->max_gf_interval = FIXED_GF_INTERVAL; + rc->min_gf_interval = FIXED_GF_INTERVAL; + rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL; + } else { + double framerate = cpi->framerate; + // Set Maximum gf/arf interval + rc->max_gf_interval = oxcf->max_gf_interval; + rc->min_gf_interval = oxcf->min_gf_interval; +#if CONFIG_RATE_CTRL + if (oxcf->use_simple_encode_api) { + // In this experiment, we avoid framerate being changed dynamically during + // encoding. + framerate = oxcf->init_framerate; + } +#endif // CONFIG_RATE_CTRL + if (rc->min_gf_interval == 0) { + rc->min_gf_interval = vp9_rc_get_default_min_gf_interval( + oxcf->width, oxcf->height, framerate); + } + if (rc->max_gf_interval == 0) { + rc->max_gf_interval = + vp9_rc_get_default_max_gf_interval(framerate, rc->min_gf_interval); + } + + // Extended max interval for genuinely static scenes like slide shows. + rc->static_scene_max_gf_interval = MAX_STATIC_GF_GROUP_LENGTH; + + if (rc->max_gf_interval > rc->static_scene_max_gf_interval) + rc->max_gf_interval = rc->static_scene_max_gf_interval; + + // Clamp min to max + rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval); + + if (oxcf->target_level == LEVEL_AUTO) { + const uint32_t pic_size = cpi->common.width * cpi->common.height; + const uint32_t pic_breadth = + VPXMAX(cpi->common.width, cpi->common.height); + int i; + for (i = 0; i < VP9_LEVELS; ++i) { + if (vp9_level_defs[i].max_luma_picture_size >= pic_size && + vp9_level_defs[i].max_luma_picture_breadth >= pic_breadth) { + if (rc->min_gf_interval <= + (int)vp9_level_defs[i].min_altref_distance) { + rc->min_gf_interval = (int)vp9_level_defs[i].min_altref_distance; + rc->max_gf_interval = + VPXMAX(rc->max_gf_interval, rc->min_gf_interval); + } + break; + } + } + } + } +} + +void vp9_rc_update_framerate(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + const VP9EncoderConfig *const oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + int vbr_max_bits; + + rc->avg_frame_bandwidth = + (int)VPXMIN(oxcf->target_bandwidth / cpi->framerate, INT_MAX); + rc->min_frame_bandwidth = + (int)(rc->avg_frame_bandwidth * oxcf->two_pass_vbrmin_section / 100); + + rc->min_frame_bandwidth = + VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS); + + // A maximum bitrate for a frame is defined. + // However this limit is extended if a very high rate is given on the command + // line or the rate can not be achieved because of a user specified max q + // (e.g. when the user specifies lossless encode). + // + // If a level is specified that requires a lower maximum rate then the level + // value take precedence. + vbr_max_bits = + (int)(((int64_t)rc->avg_frame_bandwidth * oxcf->two_pass_vbrmax_section) / + 100); + rc->max_frame_bandwidth = + VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); + + vp9_rc_set_gf_interval_range(cpi, rc); +} + +#define VBR_PCT_ADJUSTMENT_LIMIT 50 +// For VBR...adjustment to the frame target based on error from previous frames +static void vbr_rate_correction(VP9_COMP *cpi, int *this_frame_target) { + RATE_CONTROL *const rc = &cpi->rc; + int64_t vbr_bits_off_target = rc->vbr_bits_off_target; + int max_delta; + int frame_window = VPXMIN(16, ((int)cpi->twopass.total_stats.count - + cpi->common.current_video_frame)); + + // Calcluate the adjustment to rate for this frame. + if (frame_window > 0) { + max_delta = (vbr_bits_off_target > 0) + ? (int)(vbr_bits_off_target / frame_window) + : (int)(-vbr_bits_off_target / frame_window); + + max_delta = VPXMIN(max_delta, + ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100)); + + // vbr_bits_off_target > 0 means we have extra bits to spend + if (vbr_bits_off_target > 0) { + *this_frame_target += (vbr_bits_off_target > max_delta) + ? max_delta + : (int)vbr_bits_off_target; + } else { + *this_frame_target -= (vbr_bits_off_target < -max_delta) + ? max_delta + : (int)-vbr_bits_off_target; + } + } + + // Fast redistribution of bits arising from massive local undershoot. + // Don't do it for kf,arf,gf or overlay frames. + if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref && + rc->vbr_bits_off_target_fast) { + int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target); + int fast_extra_bits; + fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits); + fast_extra_bits = (int)VPXMIN( + fast_extra_bits, + VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8)); + *this_frame_target += (int)fast_extra_bits; + rc->vbr_bits_off_target_fast -= fast_extra_bits; + } +} + +void vp9_set_target_rate(VP9_COMP *cpi) { + RATE_CONTROL *const rc = &cpi->rc; + int target_rate = rc->base_frame_target; + + if (cpi->common.frame_type == KEY_FRAME) + target_rate = vp9_rc_clamp_iframe_target_size(cpi, target_rate); + else + target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate); + + if (!cpi->oxcf.vbr_corpus_complexity) { + // Correction to rate target based on prior over or under shoot. + if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ) + vbr_rate_correction(cpi, &target_rate); + } + vp9_rc_set_frame_target(cpi, target_rate); +} + +// Check if we should resize, based on average QP from past x frames. +// Only allow for resize at most one scale down for now, scaling factor is 2. +int vp9_resize_one_pass_cbr(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + RESIZE_ACTION resize_action = NO_RESIZE; + int avg_qp_thr1 = 70; + int avg_qp_thr2 = 50; + // Don't allow for resized frame to go below 320x180, resize in steps of 3/4. + int min_width = (320 * 4) / 3; + int min_height = (180 * 4) / 3; + int down_size_on = 1; + int force_downsize_rate = 0; + cpi->resize_scale_num = 1; + cpi->resize_scale_den = 1; + // Don't resize on key frame; reset the counters on key frame. + if (cm->frame_type == KEY_FRAME) { + cpi->resize_avg_qp = 0; + cpi->resize_count = 0; + return 0; + } + + // No resizing down if frame size is below some limit. + if ((cm->width * cm->height) < min_width * min_height) down_size_on = 0; + +#if CONFIG_VP9_TEMPORAL_DENOISING + // If denoiser is on, apply a smaller qp threshold. + if (cpi->oxcf.noise_sensitivity > 0) { + avg_qp_thr1 = 60; + avg_qp_thr2 = 40; + } +#endif + + // Force downsize based on per-frame-bandwidth, for extreme case, + // for HD input. + if (cpi->resize_state == ORIG && cm->width * cm->height >= 1280 * 720) { + if (rc->avg_frame_bandwidth < 300000 / 30) { + resize_action = DOWN_ONEHALF; + cpi->resize_state = ONE_HALF; + force_downsize_rate = 1; + } else if (rc->avg_frame_bandwidth < 400000 / 30) { + resize_action = ONEHALFONLY_RESIZE ? DOWN_ONEHALF : DOWN_THREEFOUR; + cpi->resize_state = ONEHALFONLY_RESIZE ? ONE_HALF : THREE_QUARTER; + force_downsize_rate = 1; + } + } else if (cpi->resize_state == THREE_QUARTER && + cm->width * cm->height >= 960 * 540) { + if (rc->avg_frame_bandwidth < 300000 / 30) { + resize_action = DOWN_ONEHALF; + cpi->resize_state = ONE_HALF; + force_downsize_rate = 1; + } + } + + // Resize based on average buffer underflow and QP over some window. + // Ignore samples close to key frame, since QP is usually high after key. + if (!force_downsize_rate && cpi->rc.frames_since_key > cpi->framerate) { + const int window = VPXMIN(30, (int)(2 * cpi->framerate)); + cpi->resize_avg_qp += rc->last_q[INTER_FRAME]; + if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100)) + ++cpi->resize_buffer_underflow; + ++cpi->resize_count; + // Check for resize action every "window" frames. + if (cpi->resize_count >= window) { + int avg_qp = cpi->resize_avg_qp / cpi->resize_count; + // Resize down if buffer level has underflowed sufficient amount in past + // window, and we are at original or 3/4 of original resolution. + // Resize back up if average QP is low, and we are currently in a resized + // down state, i.e. 1/2 or 3/4 of original resolution. + // Currently, use a flag to turn 3/4 resizing feature on/off. + if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2) && + down_size_on) { + if (cpi->resize_state == THREE_QUARTER) { + resize_action = DOWN_ONEHALF; + cpi->resize_state = ONE_HALF; + } else if (cpi->resize_state == ORIG) { + resize_action = ONEHALFONLY_RESIZE ? DOWN_ONEHALF : DOWN_THREEFOUR; + cpi->resize_state = ONEHALFONLY_RESIZE ? ONE_HALF : THREE_QUARTER; + } + } else if (cpi->resize_state != ORIG && + avg_qp < avg_qp_thr1 * cpi->rc.worst_quality / 100) { + if (cpi->resize_state == THREE_QUARTER || + avg_qp < avg_qp_thr2 * cpi->rc.worst_quality / 100 || + ONEHALFONLY_RESIZE) { + resize_action = UP_ORIG; + cpi->resize_state = ORIG; + } else if (cpi->resize_state == ONE_HALF) { + resize_action = UP_THREEFOUR; + cpi->resize_state = THREE_QUARTER; + } + } + // Reset for next window measurement. + cpi->resize_avg_qp = 0; + cpi->resize_count = 0; + cpi->resize_buffer_underflow = 0; + } + } + // If decision is to resize, reset some quantities, and check is we should + // reduce rate correction factor, + if (resize_action != NO_RESIZE) { + int target_bits_per_frame; + int active_worst_quality; + int qindex; + int tot_scale_change; + if (resize_action == DOWN_THREEFOUR || resize_action == UP_THREEFOUR) { + cpi->resize_scale_num = 3; + cpi->resize_scale_den = 4; + } else if (resize_action == DOWN_ONEHALF) { + cpi->resize_scale_num = 1; + cpi->resize_scale_den = 2; + } else { // UP_ORIG or anything else + cpi->resize_scale_num = 1; + cpi->resize_scale_den = 1; + } + tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) / + (cpi->resize_scale_num * cpi->resize_scale_num); + // Reset buffer level to optimal, update target size. + rc->buffer_level = rc->optimal_buffer_level; + rc->bits_off_target = rc->optimal_buffer_level; + rc->this_frame_target = vp9_calc_pframe_target_size_one_pass_cbr(cpi); + // Get the projected qindex, based on the scaled target frame size (scaled + // so target_bits_per_mb in vp9_rc_regulate_q will be correct target). + target_bits_per_frame = (resize_action >= 0) + ? rc->this_frame_target * tot_scale_change + : rc->this_frame_target / tot_scale_change; + active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); + qindex = vp9_rc_regulate_q(cpi, target_bits_per_frame, rc->best_quality, + active_worst_quality); + // If resize is down, check if projected q index is close to worst_quality, + // and if so, reduce the rate correction factor (since likely can afford + // lower q for resized frame). + if (resize_action > 0 && qindex > 90 * cpi->rc.worst_quality / 100) { + rc->rate_correction_factors[INTER_NORMAL] *= 0.85; + } + // If resize is back up, check if projected q index is too much above the + // current base_qindex, and if so, reduce the rate correction factor + // (since prefer to keep q for resized frame at least close to previous q). + if (resize_action < 0 && qindex > 130 * cm->base_qindex / 100) { + rc->rate_correction_factors[INTER_NORMAL] *= 0.9; + } + } + return resize_action; +} + +static void adjust_gf_boost_lag_one_pass_vbr(VP9_COMP *cpi, + uint64_t avg_sad_current) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + int target; + int found = 0; + int found2 = 0; + int frame; + int i; + uint64_t avg_source_sad_lag = avg_sad_current; + int high_source_sad_lagindex = -1; + int steady_sad_lagindex = -1; + uint32_t sad_thresh1 = 70000; + uint32_t sad_thresh2 = 120000; + int low_content = 0; + int high_content = 0; + double rate_err = 1.0; + // Get measure of complexity over the future frames, and get the first + // future frame with high_source_sad/scene-change. + int tot_frames = (int)vp9_lookahead_depth(cpi->lookahead) - 1; + for (frame = tot_frames; frame >= 1; --frame) { + const int lagframe_idx = tot_frames - frame + 1; + uint64_t reference_sad = rc->avg_source_sad[0]; + for (i = 1; i < lagframe_idx; ++i) { + if (rc->avg_source_sad[i] > 0) + reference_sad = (3 * reference_sad + rc->avg_source_sad[i]) >> 2; + } + // Detect up-coming scene change. + if (!found && + (rc->avg_source_sad[lagframe_idx] > + VPXMAX(sad_thresh1, (unsigned int)(reference_sad << 1)) || + rc->avg_source_sad[lagframe_idx] > + VPXMAX(3 * sad_thresh1 >> 2, + (unsigned int)(reference_sad << 2)))) { + high_source_sad_lagindex = lagframe_idx; + found = 1; + } + // Detect change from motion to steady. + if (!found2 && lagframe_idx > 1 && lagframe_idx < tot_frames && + rc->avg_source_sad[lagframe_idx - 1] > (sad_thresh1 >> 2)) { + found2 = 1; + for (i = lagframe_idx; i < tot_frames; ++i) { + if (!(rc->avg_source_sad[i] > 0 && + rc->avg_source_sad[i] < (sad_thresh1 >> 2) && + rc->avg_source_sad[i] < + (rc->avg_source_sad[lagframe_idx - 1] >> 1))) { + found2 = 0; + i = tot_frames; + } + } + if (found2) steady_sad_lagindex = lagframe_idx; + } + avg_source_sad_lag += rc->avg_source_sad[lagframe_idx]; + } + if (tot_frames > 0) avg_source_sad_lag = avg_source_sad_lag / tot_frames; + // Constrain distance between detected scene cuts. + if (high_source_sad_lagindex != -1 && + high_source_sad_lagindex != rc->high_source_sad_lagindex - 1 && + abs(high_source_sad_lagindex - rc->high_source_sad_lagindex) < 4) + rc->high_source_sad_lagindex = -1; + else + rc->high_source_sad_lagindex = high_source_sad_lagindex; + // Adjust some factors for the next GF group, ignore initial key frame, + // and only for lag_in_frames not too small. + if (cpi->refresh_golden_frame == 1 && cm->current_video_frame > 30 && + cpi->oxcf.lag_in_frames > 8) { + int frame_constraint; + if (rc->rolling_target_bits > 0) + rate_err = + (double)rc->rolling_actual_bits / (double)rc->rolling_target_bits; + high_content = high_source_sad_lagindex != -1 || + avg_source_sad_lag > (rc->prev_avg_source_sad_lag << 1) || + avg_source_sad_lag > sad_thresh2; + low_content = high_source_sad_lagindex == -1 && + ((avg_source_sad_lag < (rc->prev_avg_source_sad_lag >> 1)) || + (avg_source_sad_lag < sad_thresh1)); + if (low_content) { + rc->gfu_boost = DEFAULT_GF_BOOST; + rc->baseline_gf_interval = + VPXMIN(15, (3 * rc->baseline_gf_interval) >> 1); + } else if (high_content) { + rc->gfu_boost = DEFAULT_GF_BOOST >> 1; + rc->baseline_gf_interval = (rate_err > 3.0) + ? VPXMAX(10, rc->baseline_gf_interval >> 1) + : VPXMAX(6, rc->baseline_gf_interval >> 1); + } + if (rc->baseline_gf_interval > cpi->oxcf.lag_in_frames - 1) + rc->baseline_gf_interval = cpi->oxcf.lag_in_frames - 1; + // Check for constraining gf_interval for up-coming scene/content changes, + // or for up-coming key frame, whichever is closer. + frame_constraint = rc->frames_to_key; + if (rc->high_source_sad_lagindex > 0 && + frame_constraint > rc->high_source_sad_lagindex) + frame_constraint = rc->high_source_sad_lagindex; + if (steady_sad_lagindex > 3 && frame_constraint > steady_sad_lagindex) + frame_constraint = steady_sad_lagindex; + adjust_gfint_frame_constraint(cpi, frame_constraint); + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + // Adjust factors for active_worst setting & af_ratio for next gf interval. + rc->fac_active_worst_inter = 150; // corresponds to 3/2 (= 150 /100). + rc->fac_active_worst_gf = 100; + if (rate_err < 2.0 && !high_content) { + rc->fac_active_worst_inter = 120; + rc->fac_active_worst_gf = 90; + } else if (rate_err > 8.0 && rc->avg_frame_qindex[INTER_FRAME] < 16) { + // Increase active_worst faster at low Q if rate fluctuation is high. + rc->fac_active_worst_inter = 200; + if (rc->avg_frame_qindex[INTER_FRAME] < 8) + rc->fac_active_worst_inter = 400; + } + if (low_content && rc->avg_frame_low_motion > 80) { + rc->af_ratio_onepass_vbr = 15; + } else if (high_content || rc->avg_frame_low_motion < 30) { + rc->af_ratio_onepass_vbr = 5; + rc->gfu_boost = DEFAULT_GF_BOOST >> 2; + } + if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf) { + // Flag to disable usage of ARF based on past usage, only allow this + // disabling if current frame/group does not start with key frame or + // scene cut. Note perc_arf_usage is only computed for speed >= 5. + int arf_usage_low = + (cm->frame_type != KEY_FRAME && !rc->high_source_sad && + cpi->rc.perc_arf_usage < 15 && cpi->oxcf.speed >= 5); + // Don't use alt-ref for this group under certain conditions. + if (arf_usage_low || + (rc->high_source_sad_lagindex > 0 && + rc->high_source_sad_lagindex <= rc->frames_till_gf_update_due) || + (avg_source_sad_lag > 3 * sad_thresh1 >> 3)) { + rc->source_alt_ref_pending = 0; + rc->alt_ref_gf_group = 0; + } else { + rc->source_alt_ref_pending = 1; + rc->alt_ref_gf_group = 1; + // If alt-ref is used for this gf group, limit the interval. + if (rc->baseline_gf_interval > 12) { + rc->baseline_gf_interval = 12; + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + } + } + } + target = vp9_calc_pframe_target_size_one_pass_vbr(cpi); + vp9_rc_set_frame_target(cpi, target); + } + rc->prev_avg_source_sad_lag = avg_source_sad_lag; +} + +// Compute average source sad (temporal sad: between current source and +// previous source) over a subset of superblocks. Use this is detect big changes +// in content and allow rate control to react. +// This function also handles special case of lag_in_frames, to measure content +// level in #future frames set by the lag_in_frames. +void vp9_scene_detection_onepass(VP9_COMP *cpi) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + YV12_BUFFER_CONFIG const *unscaled_src = cpi->un_scaled_source; + YV12_BUFFER_CONFIG const *unscaled_last_src = cpi->unscaled_last_source; + uint8_t *src_y; + int src_ystride; + int src_width; + int src_height; + uint8_t *last_src_y; + int last_src_ystride; + int last_src_width; + int last_src_height; + if (cpi->un_scaled_source == NULL || cpi->unscaled_last_source == NULL || + (cpi->use_svc && cpi->svc.current_superframe == 0)) + return; + src_y = unscaled_src->y_buffer; + src_ystride = unscaled_src->y_stride; + src_width = unscaled_src->y_width; + src_height = unscaled_src->y_height; + last_src_y = unscaled_last_src->y_buffer; + last_src_ystride = unscaled_last_src->y_stride; + last_src_width = unscaled_last_src->y_width; + last_src_height = unscaled_last_src->y_height; +#if CONFIG_VP9_HIGHBITDEPTH + if (cm->use_highbitdepth) return; +#endif + rc->high_source_sad = 0; + rc->high_num_blocks_with_motion = 0; + // For SVC: scene detection is only checked on first spatial layer of + // the superframe using the original/unscaled resolutions. + if (cpi->svc.spatial_layer_id == cpi->svc.first_spatial_layer_to_encode && + src_width == last_src_width && src_height == last_src_height) { + YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL }; + int num_mi_cols = cm->mi_cols; + int num_mi_rows = cm->mi_rows; + int start_frame = 0; + int frames_to_buffer = 1; + int frame = 0; + int scene_cut_force_key_frame = 0; + int num_zero_temp_sad = 0; + uint64_t avg_sad_current = 0; + uint32_t min_thresh = 20000; // ~5 * 64 * 64 + float thresh = 8.0f; + uint32_t thresh_key = 140000; + if (cpi->oxcf.speed <= 5) thresh_key = 240000; + if (cpi->oxcf.content != VP9E_CONTENT_SCREEN) min_thresh = 65000; + if (cpi->oxcf.rc_mode == VPX_VBR) thresh = 2.1f; + if (cpi->use_svc && cpi->svc.number_spatial_layers > 1) { + const int aligned_width = ALIGN_POWER_OF_TWO(src_width, MI_SIZE_LOG2); + const int aligned_height = ALIGN_POWER_OF_TWO(src_height, MI_SIZE_LOG2); + num_mi_cols = aligned_width >> MI_SIZE_LOG2; + num_mi_rows = aligned_height >> MI_SIZE_LOG2; + } + if (cpi->oxcf.lag_in_frames > 0) { + frames_to_buffer = (cm->current_video_frame == 1) + ? (int)vp9_lookahead_depth(cpi->lookahead) - 1 + : 2; + start_frame = (int)vp9_lookahead_depth(cpi->lookahead) - 1; + for (frame = 0; frame < frames_to_buffer; ++frame) { + const int lagframe_idx = start_frame - frame; + if (lagframe_idx >= 0) { + struct lookahead_entry *buf = + vp9_lookahead_peek(cpi->lookahead, lagframe_idx); + frames[frame] = &buf->img; + } + } + // The avg_sad for this current frame is the value of frame#1 + // (first future frame) from previous frame. + avg_sad_current = rc->avg_source_sad[1]; + if (avg_sad_current > + VPXMAX(min_thresh, + (unsigned int)(rc->avg_source_sad[0] * thresh)) && + cm->current_video_frame > (unsigned int)cpi->oxcf.lag_in_frames) + rc->high_source_sad = 1; + else + rc->high_source_sad = 0; + if (rc->high_source_sad && avg_sad_current > thresh_key) + scene_cut_force_key_frame = 1; + // Update recursive average for current frame. + if (avg_sad_current > 0) + rc->avg_source_sad[0] = + (3 * rc->avg_source_sad[0] + avg_sad_current) >> 2; + // Shift back data, starting at frame#1. + for (frame = 1; frame < cpi->oxcf.lag_in_frames - 1; ++frame) + rc->avg_source_sad[frame] = rc->avg_source_sad[frame + 1]; + } + for (frame = 0; frame < frames_to_buffer; ++frame) { + if (cpi->oxcf.lag_in_frames == 0 || + (frames[frame] != NULL && frames[frame + 1] != NULL && + frames[frame]->y_width == frames[frame + 1]->y_width && + frames[frame]->y_height == frames[frame + 1]->y_height)) { + int sbi_row, sbi_col; + const int lagframe_idx = + (cpi->oxcf.lag_in_frames == 0) ? 0 : start_frame - frame + 1; + const BLOCK_SIZE bsize = BLOCK_64X64; + // Loop over sub-sample of frame, compute average sad over 64x64 blocks. + uint64_t avg_sad = 0; + uint64_t tmp_sad = 0; + int num_samples = 0; + int sb_cols = (num_mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE; + int sb_rows = (num_mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE; + if (cpi->oxcf.lag_in_frames > 0) { + src_y = frames[frame]->y_buffer; + src_ystride = frames[frame]->y_stride; + last_src_y = frames[frame + 1]->y_buffer; + last_src_ystride = frames[frame + 1]->y_stride; + } + num_zero_temp_sad = 0; + for (sbi_row = 0; sbi_row < sb_rows; ++sbi_row) { + for (sbi_col = 0; sbi_col < sb_cols; ++sbi_col) { + // Checker-board pattern, ignore boundary. + if (((sbi_row > 0 && sbi_col > 0) && + (sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) && + ((sbi_row % 2 == 0 && sbi_col % 2 == 0) || + (sbi_row % 2 != 0 && sbi_col % 2 != 0)))) { + tmp_sad = cpi->fn_ptr[bsize].sdf(src_y, src_ystride, last_src_y, + last_src_ystride); + avg_sad += tmp_sad; + num_samples++; + if (tmp_sad == 0) num_zero_temp_sad++; + } + src_y += 64; + last_src_y += 64; + } + src_y += (src_ystride << 6) - (sb_cols << 6); + last_src_y += (last_src_ystride << 6) - (sb_cols << 6); + } + if (num_samples > 0) avg_sad = avg_sad / num_samples; + // Set high_source_sad flag if we detect very high increase in avg_sad + // between current and previous frame value(s). Use minimum threshold + // for cases where there is small change from content that is completely + // static. + if (lagframe_idx == 0) { + if (avg_sad > + VPXMAX(min_thresh, + (unsigned int)(rc->avg_source_sad[0] * thresh)) && + rc->frames_since_key > 1 + cpi->svc.number_spatial_layers && + num_zero_temp_sad < 3 * (num_samples >> 2)) + rc->high_source_sad = 1; + else + rc->high_source_sad = 0; + if (rc->high_source_sad && avg_sad > thresh_key) + scene_cut_force_key_frame = 1; + if (avg_sad > 0 || cpi->oxcf.rc_mode == VPX_CBR) + rc->avg_source_sad[0] = (3 * rc->avg_source_sad[0] + avg_sad) >> 2; + } else { + rc->avg_source_sad[lagframe_idx] = avg_sad; + } + if (num_zero_temp_sad < (3 * num_samples >> 2)) + rc->high_num_blocks_with_motion = 1; + } + } + // For CBR non-screen content mode, check if we should reset the rate + // control. Reset is done if high_source_sad is detected and the rate + // control is at very low QP with rate correction factor at min level. + if (cpi->oxcf.rc_mode == VPX_CBR && + cpi->oxcf.content != VP9E_CONTENT_SCREEN && !cpi->use_svc) { + if (rc->high_source_sad && rc->last_q[INTER_FRAME] == rc->best_quality && + rc->avg_frame_qindex[INTER_FRAME] < (rc->best_quality << 1) && + rc->rate_correction_factors[INTER_NORMAL] == MIN_BPB_FACTOR) { + rc->rate_correction_factors[INTER_NORMAL] = 0.5; + rc->avg_frame_qindex[INTER_FRAME] = rc->worst_quality; + rc->buffer_level = rc->optimal_buffer_level; + rc->bits_off_target = rc->optimal_buffer_level; + rc->reset_high_source_sad = 1; + } + if (cm->frame_type != KEY_FRAME && rc->reset_high_source_sad) + rc->this_frame_target = rc->avg_frame_bandwidth; + } + // For SVC the new (updated) avg_source_sad[0] for the current superframe + // updates the setting for all layers. + if (cpi->use_svc) { + int sl, tl; + SVC *const svc = &cpi->svc; + for (sl = 0; sl < svc->number_spatial_layers; ++sl) + for (tl = 0; tl < svc->number_temporal_layers; ++tl) { + int layer = LAYER_IDS_TO_IDX(sl, tl, svc->number_temporal_layers); + LAYER_CONTEXT *const lc = &svc->layer_context[layer]; + RATE_CONTROL *const lrc = &lc->rc; + lrc->avg_source_sad[0] = rc->avg_source_sad[0]; + } + } + // For VBR, under scene change/high content change, force golden refresh. + if (cpi->oxcf.rc_mode == VPX_VBR && cm->frame_type != KEY_FRAME && + rc->high_source_sad && rc->frames_to_key > 3 && + rc->count_last_scene_change > 4 && + cpi->ext_refresh_frame_flags_pending == 0) { + int target; + cpi->refresh_golden_frame = 1; + if (scene_cut_force_key_frame) cm->frame_type = KEY_FRAME; + rc->source_alt_ref_pending = 0; + if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf) + rc->source_alt_ref_pending = 1; + rc->gfu_boost = DEFAULT_GF_BOOST >> 1; + rc->baseline_gf_interval = + VPXMIN(20, VPXMAX(10, rc->baseline_gf_interval)); + adjust_gfint_frame_constraint(cpi, rc->frames_to_key); + rc->frames_till_gf_update_due = rc->baseline_gf_interval; + target = vp9_calc_pframe_target_size_one_pass_vbr(cpi); + vp9_rc_set_frame_target(cpi, target); + rc->count_last_scene_change = 0; + } else { + rc->count_last_scene_change++; + } + // If lag_in_frame is used, set the gf boost and interval. + if (cpi->oxcf.lag_in_frames > 0) + adjust_gf_boost_lag_one_pass_vbr(cpi, avg_sad_current); + } +} + +// Test if encoded frame will significantly overshoot the target bitrate, and +// if so, set the QP, reset/adjust some rate control parameters, and return 1. +// frame_size = -1 means frame has not been encoded. +int vp9_encodedframe_overshoot(VP9_COMP *cpi, int frame_size, int *q) { + VP9_COMMON *const cm = &cpi->common; + RATE_CONTROL *const rc = &cpi->rc; + SPEED_FEATURES *const sf = &cpi->sf; + int thresh_qp = 7 * (rc->worst_quality >> 3); + int thresh_rate = rc->avg_frame_bandwidth << 3; + // Lower thresh_qp for video (more overshoot at lower Q) to be + // more conservative for video. + if (cpi->oxcf.content != VP9E_CONTENT_SCREEN) + thresh_qp = 3 * (rc->worst_quality >> 2); + // If this decision is not based on an encoded frame size but just on + // scene/slide change detection (i.e., re_encode_overshoot_cbr_rt == + // FAST_DETECTION_MAXQ), for now skip the (frame_size > thresh_rate) + // condition in this case. + // TODO(marpan): Use a better size/rate condition for this case and + // adjust thresholds. + if ((sf->overshoot_detection_cbr_rt == FAST_DETECTION_MAXQ || + frame_size > thresh_rate) && + cm->base_qindex < thresh_qp) { + double rate_correction_factor = + cpi->rc.rate_correction_factors[INTER_NORMAL]; + const int target_size = cpi->rc.avg_frame_bandwidth; + double new_correction_factor; + int target_bits_per_mb; + double q2; + int enumerator; + // Force a re-encode, and for now use max-QP. + *q = cpi->rc.worst_quality; + cpi->cyclic_refresh->counter_encode_maxq_scene_change = 0; + cpi->rc.re_encode_maxq_scene_change = 1; + // If the frame_size is much larger than the threshold (big content change) + // and the encoded frame used alot of Intra modes, then force hybrid_intra + // encoding for the re-encode on this scene change. hybrid_intra will + // use rd-based intra mode selection for small blocks. + if (sf->overshoot_detection_cbr_rt == RE_ENCODE_MAXQ && + frame_size > (thresh_rate << 1) && cpi->svc.spatial_layer_id == 0) { + MODE_INFO **mi = cm->mi_grid_visible; + int sum_intra_usage = 0; + int mi_row, mi_col; + for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) { + for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) { + if (mi[0]->ref_frame[0] == INTRA_FRAME) sum_intra_usage++; + mi++; + } + mi += 8; + } + sum_intra_usage = 100 * sum_intra_usage / (cm->mi_rows * cm->mi_cols); + if (sum_intra_usage > 60) cpi->rc.hybrid_intra_scene_change = 1; + } + // Adjust avg_frame_qindex, buffer_level, and rate correction factors, as + // these parameters will affect QP selection for subsequent frames. If they + // have settled down to a very different (low QP) state, then not adjusting + // them may cause next frame to select low QP and overshoot again. + cpi->rc.avg_frame_qindex[INTER_FRAME] = *q; + rc->buffer_level = rc->optimal_buffer_level; + rc->bits_off_target = rc->optimal_buffer_level; + // Reset rate under/over-shoot flags. + cpi->rc.rc_1_frame = 0; + cpi->rc.rc_2_frame = 0; + // Adjust rate correction factor. + target_bits_per_mb = + (int)(((uint64_t)target_size << BPER_MB_NORMBITS) / cm->MBs); + // Rate correction factor based on target_bits_per_mb and qp (==max_QP). + // This comes from the inverse computation of vp9_rc_bits_per_mb(). + q2 = vp9_convert_qindex_to_q(*q, cm->bit_depth); + enumerator = 1800000; // Factor for inter frame. + enumerator += (int)(enumerator * q2) >> 12; + new_correction_factor = (double)target_bits_per_mb * q2 / enumerator; + if (new_correction_factor > rate_correction_factor) { + rate_correction_factor = + VPXMIN(2.0 * rate_correction_factor, new_correction_factor); + if (rate_correction_factor > MAX_BPB_FACTOR) + rate_correction_factor = MAX_BPB_FACTOR; + cpi->rc.rate_correction_factors[INTER_NORMAL] = rate_correction_factor; + } + // For temporal layers, reset the rate control parametes across all + // temporal layers. If the first_spatial_layer_to_encode > 0, then this + // superframe has skipped lower base layers. So in this case we should also + // reset and force max-q for spatial layers < first_spatial_layer_to_encode. + if (cpi->use_svc) { + int tl = 0; + int sl = 0; + SVC *svc = &cpi->svc; + for (sl = 0; sl < VPXMAX(1, svc->first_spatial_layer_to_encode); ++sl) { + for (tl = 0; tl < svc->number_temporal_layers; ++tl) { + const int layer = + LAYER_IDS_TO_IDX(sl, tl, svc->number_temporal_layers); + LAYER_CONTEXT *lc = &svc->layer_context[layer]; + RATE_CONTROL *lrc = &lc->rc; + lrc->avg_frame_qindex[INTER_FRAME] = *q; + lrc->buffer_level = lrc->optimal_buffer_level; + lrc->bits_off_target = lrc->optimal_buffer_level; + lrc->rc_1_frame = 0; + lrc->rc_2_frame = 0; + lrc->rate_correction_factors[INTER_NORMAL] = rate_correction_factor; + lrc->force_max_q = 1; + } + } + } + return 1; + } else { + return 0; + } +} |