diff options
Diffstat (limited to 'media/libvpx/libvpx/vp8/encoder/ratectrl.c')
| -rw-r--r-- | media/libvpx/libvpx/vp8/encoder/ratectrl.c | 1591 |
1 files changed, 1591 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/encoder/ratectrl.c b/media/libvpx/libvpx/vp8/encoder/ratectrl.c new file mode 100644 index 0000000000..fcd4eb04eb --- /dev/null +++ b/media/libvpx/libvpx/vp8/encoder/ratectrl.c @@ -0,0 +1,1591 @@ +/* + * 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 <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <limits.h> +#include <assert.h> + +#include "math.h" +#include "vp8/common/common.h" +#include "ratectrl.h" +#include "vp8/common/entropymode.h" +#include "vpx_mem/vpx_mem.h" +#include "vp8/common/systemdependent.h" +#include "encodemv.h" +#include "vpx_dsp/vpx_dsp_common.h" +#include "vpx_ports/system_state.h" + +#define MIN_BPB_FACTOR 0.01 +#define MAX_BPB_FACTOR 50 + +extern const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES]; + +#ifdef MODE_STATS +extern int y_modes[5]; +extern int uv_modes[4]; +extern int b_modes[10]; + +extern int inter_y_modes[10]; +extern int inter_uv_modes[4]; +extern int inter_b_modes[10]; +#endif + +/* Bits Per MB at different Q (Multiplied by 512) */ +#define BPER_MB_NORMBITS 9 + +/* Work in progress recalibration of baseline rate tables based on + * the assumption that bits per mb is inversely proportional to the + * quantizer value. + */ +const int vp8_bits_per_mb[2][QINDEX_RANGE] = { + /* Intra case 450000/Qintra */ + { + 1125000, 900000, 750000, 642857, 562500, 500000, 450000, 450000, 409090, + 375000, 346153, 321428, 300000, 281250, 264705, 264705, 250000, 236842, + 225000, 225000, 214285, 214285, 204545, 204545, 195652, 195652, 187500, + 180000, 180000, 173076, 166666, 160714, 155172, 150000, 145161, 140625, + 136363, 132352, 128571, 125000, 121621, 121621, 118421, 115384, 112500, + 109756, 107142, 104651, 102272, 100000, 97826, 97826, 95744, 93750, + 91836, 90000, 88235, 86538, 84905, 83333, 81818, 80357, 78947, + 77586, 76271, 75000, 73770, 72580, 71428, 70312, 69230, 68181, + 67164, 66176, 65217, 64285, 63380, 62500, 61643, 60810, 60000, + 59210, 59210, 58441, 57692, 56962, 56250, 55555, 54878, 54216, + 53571, 52941, 52325, 51724, 51136, 50561, 49450, 48387, 47368, + 46875, 45918, 45000, 44554, 44117, 43269, 42452, 41666, 40909, + 40178, 39473, 38793, 38135, 36885, 36290, 35714, 35156, 34615, + 34090, 33582, 33088, 32608, 32142, 31468, 31034, 30405, 29801, + 29220, 28662, + }, + /* Inter case 285000/Qinter */ + { + 712500, 570000, 475000, 407142, 356250, 316666, 285000, 259090, 237500, + 219230, 203571, 190000, 178125, 167647, 158333, 150000, 142500, 135714, + 129545, 123913, 118750, 114000, 109615, 105555, 101785, 98275, 95000, + 91935, 89062, 86363, 83823, 81428, 79166, 77027, 75000, 73076, + 71250, 69512, 67857, 66279, 64772, 63333, 61956, 60638, 59375, + 58163, 57000, 55882, 54807, 53773, 52777, 51818, 50892, 50000, + 49137, 47500, 45967, 44531, 43181, 41911, 40714, 39583, 38513, + 37500, 36538, 35625, 34756, 33928, 33139, 32386, 31666, 30978, + 30319, 29687, 29081, 28500, 27941, 27403, 26886, 26388, 25909, + 25446, 25000, 24568, 23949, 23360, 22800, 22265, 21755, 21268, + 20802, 20357, 19930, 19520, 19127, 18750, 18387, 18037, 17701, + 17378, 17065, 16764, 16473, 16101, 15745, 15405, 15079, 14766, + 14467, 14179, 13902, 13636, 13380, 13133, 12895, 12666, 12445, + 12179, 11924, 11632, 11445, 11220, 11003, 10795, 10594, 10401, + 10215, 10035, + } +}; + +static const int kf_boost_qadjustment[QINDEX_RANGE] = { + 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, + 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, + 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, + 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, + 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 200, 201, + 201, 202, 203, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207, 208, 208, + 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216, + 216, 217, 217, 218, 218, 219, 219, 220, 220, 220, 220, 220, 220, 220, 220, + 220, 220, 220, 220, 220, 220, 220, 220, +}; + +/* #define GFQ_ADJUSTMENT (Q+100) */ +#define GFQ_ADJUSTMENT vp8_gf_boost_qadjustment[Q] +const int vp8_gf_boost_qadjustment[QINDEX_RANGE] = { + 80, 82, 84, 86, 88, 90, 92, 94, 96, 97, 98, 99, 100, 101, 102, + 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, + 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, + 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, + 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, + 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, + 178, 179, 180, 181, 182, 183, 184, 184, 185, 185, 186, 186, 187, 187, 188, + 188, 189, 189, 190, 190, 191, 191, 192, 192, 193, 193, 194, 194, 194, 194, + 195, 195, 196, 196, 197, 197, 198, 198 +}; + +/* +const int vp8_gf_boost_qadjustment[QINDEX_RANGE] = +{ + 100,101,102,103,104,105,105,106, + 106,107,107,108,109,109,110,111, + 112,113,114,115,116,117,118,119, + 120,121,122,123,124,125,126,127, + 128,129,130,131,132,133,134,135, + 136,137,138,139,140,141,142,143, + 144,145,146,147,148,149,150,151, + 152,153,154,155,156,157,158,159, + 160,161,162,163,164,165,166,167, + 168,169,170,170,171,171,172,172, + 173,173,173,174,174,174,175,175, + 175,176,176,176,177,177,177,177, + 178,178,179,179,180,180,181,181, + 182,182,183,183,184,184,185,185, + 186,186,187,187,188,188,189,189, + 190,190,191,191,192,192,193,193, +}; +*/ + +static const int kf_gf_boost_qlimits[QINDEX_RANGE] = { + 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, + 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275, 280, 285, 290, 295, + 300, 305, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, + 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, + 590, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, + 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, + 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, + 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, + 600, 600, 600, 600, 600, 600, 600, 600, +}; + +static const int gf_adjust_table[101] = { + 100, 115, 130, 145, 160, 175, 190, 200, 210, 220, 230, 240, 260, 270, 280, + 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 400, 400, 400, + 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, + 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, + 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, + 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, + 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, +}; + +static const int gf_intra_usage_adjustment[20] = { + 125, 120, 115, 110, 105, 100, 95, 85, 80, 75, + 70, 65, 60, 55, 50, 50, 50, 50, 50, 50, +}; + +static const int gf_interval_table[101] = { + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, +}; + +static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3, + 4, 5 }; + +void vp8_save_coding_context(VP8_COMP *cpi) { + CODING_CONTEXT *const cc = &cpi->coding_context; + + /* Stores a snapshot of key state variables which can subsequently be + * restored with a call to vp8_restore_coding_context. These functions are + * intended for use in a re-code loop in vp8_compress_frame where the + * quantizer value is adjusted between loop iterations. + */ + + cc->frames_since_key = cpi->frames_since_key; + cc->filter_level = cpi->common.filter_level; + cc->frames_till_gf_update_due = cpi->frames_till_gf_update_due; + cc->frames_since_golden = cpi->frames_since_golden; + + vp8_copy(cc->mvc, cpi->common.fc.mvc); + vp8_copy(cc->mvcosts, cpi->rd_costs.mvcosts); + + vp8_copy(cc->ymode_prob, cpi->common.fc.ymode_prob); + vp8_copy(cc->uv_mode_prob, cpi->common.fc.uv_mode_prob); + + vp8_copy(cc->ymode_count, cpi->mb.ymode_count); + vp8_copy(cc->uv_mode_count, cpi->mb.uv_mode_count); + +/* Stats */ +#ifdef MODE_STATS + vp8_copy(cc->y_modes, y_modes); + vp8_copy(cc->uv_modes, uv_modes); + vp8_copy(cc->b_modes, b_modes); + vp8_copy(cc->inter_y_modes, inter_y_modes); + vp8_copy(cc->inter_uv_modes, inter_uv_modes); + vp8_copy(cc->inter_b_modes, inter_b_modes); +#endif + + cc->this_frame_percent_intra = cpi->this_frame_percent_intra; +} + +void vp8_restore_coding_context(VP8_COMP *cpi) { + CODING_CONTEXT *const cc = &cpi->coding_context; + + /* Restore key state variables to the snapshot state stored in the + * previous call to vp8_save_coding_context. + */ + + cpi->frames_since_key = cc->frames_since_key; + cpi->common.filter_level = cc->filter_level; + cpi->frames_till_gf_update_due = cc->frames_till_gf_update_due; + cpi->frames_since_golden = cc->frames_since_golden; + + vp8_copy(cpi->common.fc.mvc, cc->mvc); + + vp8_copy(cpi->rd_costs.mvcosts, cc->mvcosts); + + vp8_copy(cpi->common.fc.ymode_prob, cc->ymode_prob); + vp8_copy(cpi->common.fc.uv_mode_prob, cc->uv_mode_prob); + + vp8_copy(cpi->mb.ymode_count, cc->ymode_count); + vp8_copy(cpi->mb.uv_mode_count, cc->uv_mode_count); + +/* Stats */ +#ifdef MODE_STATS + vp8_copy(y_modes, cc->y_modes); + vp8_copy(uv_modes, cc->uv_modes); + vp8_copy(b_modes, cc->b_modes); + vp8_copy(inter_y_modes, cc->inter_y_modes); + vp8_copy(inter_uv_modes, cc->inter_uv_modes); + vp8_copy(inter_b_modes, cc->inter_b_modes); +#endif + + cpi->this_frame_percent_intra = cc->this_frame_percent_intra; +} + +void vp8_setup_key_frame(VP8_COMP *cpi) { + /* Setup for Key frame: */ + + vp8_default_coef_probs(&cpi->common); + + memcpy(cpi->common.fc.mvc, vp8_default_mv_context, + sizeof(vp8_default_mv_context)); + { + int flag[2] = { 1, 1 }; + vp8_build_component_cost_table( + cpi->mb.mvcost, (const MV_CONTEXT *)cpi->common.fc.mvc, flag); + } + + /* Make sure we initialize separate contexts for altref,gold, and normal. + * TODO shouldn't need 3 different copies of structure to do this! + */ + memcpy(&cpi->lfc_a, &cpi->common.fc, sizeof(cpi->common.fc)); + memcpy(&cpi->lfc_g, &cpi->common.fc, sizeof(cpi->common.fc)); + memcpy(&cpi->lfc_n, &cpi->common.fc, sizeof(cpi->common.fc)); + + cpi->common.filter_level = cpi->common.base_qindex * 3 / 8; + + /* Provisional interval before next GF */ + if (cpi->auto_gold) { + cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; + } else { + cpi->frames_till_gf_update_due = DEFAULT_GF_INTERVAL; + } + + cpi->common.refresh_golden_frame = 1; + cpi->common.refresh_alt_ref_frame = 1; +} + +static int estimate_bits_at_q(int frame_kind, int Q, int MBs, + double correction_factor) { + int Bpm = (int)(.5 + correction_factor * vp8_bits_per_mb[frame_kind][Q]); + + /* Attempt to retain reasonable accuracy without overflow. The cutoff is + * chosen such that the maximum product of Bpm and MBs fits 31 bits. The + * largest Bpm takes 20 bits. + */ + if (MBs > (1 << 11)) { + return (Bpm >> BPER_MB_NORMBITS) * MBs; + } else { + return (Bpm * MBs) >> BPER_MB_NORMBITS; + } +} + +static void calc_iframe_target_size(VP8_COMP *cpi) { + /* boost defaults to half second */ + int kf_boost; + uint64_t target; + + /* Clear down mmx registers to allow floating point in what follows */ + vpx_clear_system_state(); + + if (cpi->oxcf.fixed_q >= 0) { + int Q = cpi->oxcf.key_q; + + target = estimate_bits_at_q(INTRA_FRAME, Q, cpi->common.MBs, + cpi->key_frame_rate_correction_factor); + } else if (cpi->pass == 2) { + /* New Two pass RC */ + target = cpi->per_frame_bandwidth; + } + /* First Frame is a special case */ + else if (cpi->common.current_video_frame == 0) { + /* 1 Pass there is no information on which to base size so use + * bandwidth per second * fraction of the initial buffer + * level + */ + target = (uint64_t)cpi->oxcf.starting_buffer_level / 2; + + if (target > cpi->oxcf.target_bandwidth * 3 / 2) { + target = cpi->oxcf.target_bandwidth * 3 / 2; + } + } else { + /* if this keyframe was forced, use a more recent Q estimate */ + int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY) ? cpi->avg_frame_qindex + : cpi->ni_av_qi; + + int initial_boost = 32; /* |3.0 * per_frame_bandwidth| */ + /* Boost depends somewhat on frame rate: only used for 1 layer case. */ + if (cpi->oxcf.number_of_layers == 1) { + kf_boost = + VPXMAX(initial_boost, (int)round(2 * cpi->output_framerate - 16)); + } else { + /* Initial factor: set target size to: |3.0 * per_frame_bandwidth|. */ + kf_boost = initial_boost; + } + + /* adjustment up based on q: this factor ranges from ~1.2 to 2.2. */ + kf_boost = kf_boost * kf_boost_qadjustment[Q] / 100; + + /* frame separation adjustment ( down) */ + if (cpi->frames_since_key < cpi->output_framerate / 2) { + kf_boost = + (int)(kf_boost * cpi->frames_since_key / (cpi->output_framerate / 2)); + } + + /* Minimal target size is |2* per_frame_bandwidth|. */ + if (kf_boost < 16) kf_boost = 16; + + target = ((uint64_t)(16 + kf_boost) * cpi->per_frame_bandwidth) >> 4; + target = VPXMIN(INT_MAX, target); + } + + if (cpi->oxcf.rc_max_intra_bitrate_pct) { + unsigned int max_rate; + // This product may overflow unsigned int + uint64_t product = cpi->per_frame_bandwidth; + product *= cpi->oxcf.rc_max_intra_bitrate_pct; + product /= 100; + max_rate = (unsigned int)VPXMIN(INT_MAX, product); + + if (target > max_rate) target = max_rate; + } + + cpi->this_frame_target = (int)target; + + /* TODO: if we separate rate targeting from Q targeting, move this. + * Reset the active worst quality to the baseline value for key frames. + */ + if (cpi->pass != 2) cpi->active_worst_quality = cpi->worst_quality; + +#if 0 + { + FILE *f; + + f = fopen("kf_boost.stt", "a"); + fprintf(f, " %8u %10d %10d %10d\n", + cpi->common.current_video_frame, cpi->gfu_boost, cpi->baseline_gf_interval, cpi->source_alt_ref_pending); + + fclose(f); + } +#endif +} + +/* Do the best we can to define the parameters for the next GF based on what + * information we have available. + */ +static void calc_gf_params(VP8_COMP *cpi) { + int Q = + (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q; + int Boost = 0; + + int gf_frame_usage = 0; /* Golden frame usage since last GF */ + int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] + + cpi->recent_ref_frame_usage[LAST_FRAME] + + cpi->recent_ref_frame_usage[GOLDEN_FRAME] + + cpi->recent_ref_frame_usage[ALTREF_FRAME]; + + int pct_gf_active = (100 * cpi->gf_active_count) / + (cpi->common.mb_rows * cpi->common.mb_cols); + + if (tot_mbs) { + gf_frame_usage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * + 100 / tot_mbs; + } + + if (pct_gf_active > gf_frame_usage) gf_frame_usage = pct_gf_active; + + /* Not two pass */ + if (cpi->pass != 2) { + /* Single Pass lagged mode: TBD */ + if (0) { + } + + /* Single Pass compression: Has to use current and historical data */ + else { +#if 0 + /* Experimental code */ + int index = cpi->one_pass_frame_index; + int frames_to_scan = (cpi->max_gf_interval <= MAX_LAG_BUFFERS) ? cpi->max_gf_interval : MAX_LAG_BUFFERS; + + /* ************** Experimental code - incomplete */ + /* + double decay_val = 1.0; + double IIAccumulator = 0.0; + double last_iiaccumulator = 0.0; + double IIRatio; + + cpi->one_pass_frame_index = cpi->common.current_video_frame%MAX_LAG_BUFFERS; + + for ( i = 0; i < (frames_to_scan - 1); i++ ) + { + if ( index < 0 ) + index = MAX_LAG_BUFFERS; + index --; + + if ( cpi->one_pass_frame_stats[index].frame_coded_error > 0.0 ) + { + IIRatio = cpi->one_pass_frame_stats[index].frame_intra_error / cpi->one_pass_frame_stats[index].frame_coded_error; + + if ( IIRatio > 30.0 ) + IIRatio = 30.0; + } + else + IIRatio = 30.0; + + IIAccumulator += IIRatio * decay_val; + + decay_val = decay_val * cpi->one_pass_frame_stats[index].frame_pcnt_inter; + + if ( (i > MIN_GF_INTERVAL) && + ((IIAccumulator - last_iiaccumulator) < 2.0) ) + { + break; + } + last_iiaccumulator = IIAccumulator; + } + + Boost = IIAccumulator*100.0/16.0; + cpi->baseline_gf_interval = i; + + */ +#else + + /*************************************************************/ + /* OLD code */ + + /* Adjust boost based upon ambient Q */ + Boost = GFQ_ADJUSTMENT; + + /* Adjust based upon most recently measure intra usage */ + Boost = Boost * + gf_intra_usage_adjustment[(cpi->this_frame_percent_intra < 15) + ? cpi->this_frame_percent_intra + : 14] / + 100; + + /* Adjust gf boost based upon GF usage since last GF */ + Boost = Boost * gf_adjust_table[gf_frame_usage] / 100; +#endif + } + + /* golden frame boost without recode loop often goes awry. be + * safe by keeping numbers down. + */ + if (!cpi->sf.recode_loop) { + if (cpi->compressor_speed == 2) Boost = Boost / 2; + } + + /* Apply an upper limit based on Q for 1 pass encodes */ + if (Boost > kf_gf_boost_qlimits[Q] && (cpi->pass == 0)) { + Boost = kf_gf_boost_qlimits[Q]; + + /* Apply lower limits to boost. */ + } else if (Boost < 110) { + Boost = 110; + } + + /* Note the boost used */ + cpi->last_boost = Boost; + } + + /* Estimate next interval + * This is updated once the real frame size/boost is known. + */ + if (cpi->oxcf.fixed_q == -1) { + if (cpi->pass == 2) { /* 2 Pass */ + cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; + } else { /* 1 Pass */ + cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; + + if (cpi->last_boost > 750) cpi->frames_till_gf_update_due++; + + if (cpi->last_boost > 1000) cpi->frames_till_gf_update_due++; + + if (cpi->last_boost > 1250) cpi->frames_till_gf_update_due++; + + if (cpi->last_boost >= 1500) cpi->frames_till_gf_update_due++; + + if (gf_interval_table[gf_frame_usage] > cpi->frames_till_gf_update_due) { + cpi->frames_till_gf_update_due = gf_interval_table[gf_frame_usage]; + } + + if (cpi->frames_till_gf_update_due > cpi->max_gf_interval) { + cpi->frames_till_gf_update_due = cpi->max_gf_interval; + } + } + } else { + cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; + } + + /* ARF on or off */ + if (cpi->pass != 2) { + /* For now Alt ref is not allowed except in 2 pass modes. */ + cpi->source_alt_ref_pending = 0; + + /*if ( cpi->oxcf.fixed_q == -1) + { + if ( cpi->oxcf.play_alternate && (cpi->last_boost > (100 + + (AF_THRESH*cpi->frames_till_gf_update_due)) ) ) + cpi->source_alt_ref_pending = 1; + else + cpi->source_alt_ref_pending = 0; + }*/ + } +} + +static void calc_pframe_target_size(VP8_COMP *cpi) { + int min_frame_target; + int old_per_frame_bandwidth = cpi->per_frame_bandwidth; + + if (cpi->current_layer > 0) { + cpi->per_frame_bandwidth = + cpi->layer_context[cpi->current_layer].avg_frame_size_for_layer; + } + + min_frame_target = 0; + + if (cpi->pass == 2) { + min_frame_target = cpi->min_frame_bandwidth; + + if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5)) { + min_frame_target = cpi->av_per_frame_bandwidth >> 5; + } + } else if (min_frame_target < cpi->per_frame_bandwidth / 4) { + min_frame_target = cpi->per_frame_bandwidth / 4; + } + + /* Special alt reference frame case */ + if ((cpi->common.refresh_alt_ref_frame) && + (cpi->oxcf.number_of_layers == 1)) { + if (cpi->pass == 2) { + /* Per frame bit target for the alt ref frame */ + cpi->per_frame_bandwidth = cpi->twopass.gf_bits; + cpi->this_frame_target = cpi->per_frame_bandwidth; + } + + /* One Pass ??? TBD */ + } + + /* Normal frames (gf,and inter) */ + else { + /* 2 pass */ + if (cpi->pass == 2) { + cpi->this_frame_target = cpi->per_frame_bandwidth; + } + /* 1 pass */ + else { + int Adjustment; + /* Make rate adjustment to recover bits spent in key frame + * Test to see if the key frame inter data rate correction + * should still be in force + */ + if (cpi->kf_overspend_bits > 0) { + Adjustment = (cpi->kf_bitrate_adjustment <= cpi->kf_overspend_bits) + ? cpi->kf_bitrate_adjustment + : cpi->kf_overspend_bits; + + if (Adjustment > (cpi->per_frame_bandwidth - min_frame_target)) { + Adjustment = (cpi->per_frame_bandwidth - min_frame_target); + } + + cpi->kf_overspend_bits -= Adjustment; + + /* Calculate an inter frame bandwidth target for the next + * few frames designed to recover any extra bits spent on + * the key frame. + */ + cpi->this_frame_target = cpi->per_frame_bandwidth - Adjustment; + + if (cpi->this_frame_target < min_frame_target) { + cpi->this_frame_target = min_frame_target; + } + } else { + cpi->this_frame_target = cpi->per_frame_bandwidth; + } + + /* If appropriate make an adjustment to recover bits spent on a + * recent GF + */ + if ((cpi->gf_overspend_bits > 0) && + (cpi->this_frame_target > min_frame_target)) { + Adjustment = (cpi->non_gf_bitrate_adjustment <= cpi->gf_overspend_bits) + ? cpi->non_gf_bitrate_adjustment + : cpi->gf_overspend_bits; + + if (Adjustment > (cpi->this_frame_target - min_frame_target)) { + Adjustment = (cpi->this_frame_target - min_frame_target); + } + + cpi->gf_overspend_bits -= Adjustment; + cpi->this_frame_target -= Adjustment; + } + + /* Apply small + and - boosts for non gf frames */ + if ((cpi->last_boost > 150) && (cpi->frames_till_gf_update_due > 0) && + (cpi->current_gf_interval >= (MIN_GF_INTERVAL << 1))) { + /* % Adjustment limited to the range 1% to 10% */ + Adjustment = (cpi->last_boost - 100) >> 5; + + if (Adjustment < 1) { + Adjustment = 1; + } else if (Adjustment > 10) { + Adjustment = 10; + } + + /* Convert to bits */ + Adjustment = (cpi->this_frame_target * Adjustment) / 100; + + if (Adjustment > (cpi->this_frame_target - min_frame_target)) { + Adjustment = (cpi->this_frame_target - min_frame_target); + } + + if (cpi->frames_since_golden == (cpi->current_gf_interval >> 1)) { + Adjustment = (cpi->current_gf_interval - 1) * Adjustment; + // Limit adjustment to 10% of current target. + if (Adjustment > (10 * cpi->this_frame_target) / 100) { + Adjustment = (10 * cpi->this_frame_target) / 100; + } + cpi->this_frame_target += Adjustment; + } else { + cpi->this_frame_target -= Adjustment; + } + } + } + } + + /* Sanity check that the total sum of adjustments is not above the + * maximum allowed That is that having allowed for KF and GF penalties + * we have not pushed the current interframe target to low. If the + * adjustment we apply here is not capable of recovering all the extra + * bits we have spent in the KF or GF then the remainder will have to + * be recovered over a longer time span via other buffer / rate control + * mechanisms. + */ + if (cpi->this_frame_target < min_frame_target) { + cpi->this_frame_target = min_frame_target; + } + + if (!cpi->common.refresh_alt_ref_frame) { + /* Note the baseline target data rate for this inter frame. */ + cpi->inter_frame_target = cpi->this_frame_target; + } + + /* One Pass specific code */ + if (cpi->pass == 0) { + /* Adapt target frame size with respect to any buffering constraints: */ + if (cpi->buffered_mode) { + int one_percent_bits = (int)(1 + cpi->oxcf.optimal_buffer_level / 100); + + if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) || + (cpi->bits_off_target < cpi->oxcf.optimal_buffer_level)) { + int percent_low = 0; + + /* Decide whether or not we need to adjust the frame data + * rate target. + * + * If we are are below the optimal buffer fullness level + * and adherence to buffering constraints is important to + * the end usage then adjust the per frame target. + */ + if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) && + (cpi->buffer_level < cpi->oxcf.optimal_buffer_level)) { + percent_low = + (int)((cpi->oxcf.optimal_buffer_level - cpi->buffer_level) / + one_percent_bits); + } + /* Are we overshooting the long term clip data rate... */ + else if (cpi->bits_off_target < 0) { + /* Adjust per frame data target downwards to compensate. */ + percent_low = + (int)(100 * -cpi->bits_off_target / (cpi->total_byte_count * 8)); + } + + if (percent_low > cpi->oxcf.under_shoot_pct) { + percent_low = cpi->oxcf.under_shoot_pct; + } else if (percent_low < 0) { + percent_low = 0; + } + + /* lower the target bandwidth for this frame. */ + cpi->this_frame_target -= + (int)(((int64_t)cpi->this_frame_target * percent_low) / 200); + + /* Are we using allowing control of active_worst_allowed_q + * according to buffer level. + */ + if (cpi->auto_worst_q && cpi->ni_frames > 150) { + int64_t critical_buffer_level; + + /* For streaming applications the most important factor is + * cpi->buffer_level as this takes into account the + * specified short term buffering constraints. However, + * hitting the long term clip data rate target is also + * important. + */ + if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) { + /* Take the smaller of cpi->buffer_level and + * cpi->bits_off_target + */ + critical_buffer_level = (cpi->buffer_level < cpi->bits_off_target) + ? cpi->buffer_level + : cpi->bits_off_target; + } + /* For local file playback short term buffering constraints + * are less of an issue + */ + else { + /* Consider only how we are doing for the clip as a + * whole + */ + critical_buffer_level = cpi->bits_off_target; + } + + /* Set the active worst quality based upon the selected + * buffer fullness number. + */ + if (critical_buffer_level < cpi->oxcf.optimal_buffer_level) { + if (critical_buffer_level > (cpi->oxcf.optimal_buffer_level >> 2)) { + int64_t qadjustment_range = cpi->worst_quality - cpi->ni_av_qi; + int64_t above_base = (critical_buffer_level - + (cpi->oxcf.optimal_buffer_level >> 2)); + + /* Step active worst quality down from + * cpi->ni_av_qi when (critical_buffer_level == + * cpi->optimal_buffer_level) to + * cpi->worst_quality when + * (critical_buffer_level == + * cpi->optimal_buffer_level >> 2) + */ + cpi->active_worst_quality = + cpi->worst_quality - + (int)((qadjustment_range * above_base) / + (cpi->oxcf.optimal_buffer_level * 3 >> 2)); + } else { + cpi->active_worst_quality = cpi->worst_quality; + } + } else { + cpi->active_worst_quality = cpi->ni_av_qi; + } + } else { + cpi->active_worst_quality = cpi->worst_quality; + } + } else { + int percent_high = 0; + int64_t target = cpi->this_frame_target; + + if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) && + (cpi->buffer_level > cpi->oxcf.optimal_buffer_level)) { + percent_high = + (int)((cpi->buffer_level - cpi->oxcf.optimal_buffer_level) / + one_percent_bits); + } else if (cpi->bits_off_target > cpi->oxcf.optimal_buffer_level) { + percent_high = + (int)((100 * cpi->bits_off_target) / (cpi->total_byte_count * 8)); + } + + if (percent_high > cpi->oxcf.over_shoot_pct) { + percent_high = cpi->oxcf.over_shoot_pct; + } else if (percent_high < 0) { + percent_high = 0; + } + + target += (target * percent_high) / 200; + target = VPXMIN(target, INT_MAX); + cpi->this_frame_target = (int)target; + + /* Are we allowing control of active_worst_allowed_q according + * to buffer level. + */ + if (cpi->auto_worst_q && cpi->ni_frames > 150) { + /* When using the relaxed buffer model stick to the + * user specified value + */ + cpi->active_worst_quality = cpi->ni_av_qi; + } else { + cpi->active_worst_quality = cpi->worst_quality; + } + } + + /* Set active_best_quality to prevent quality rising too high */ + cpi->active_best_quality = cpi->best_quality; + + /* Worst quality obviously must not be better than best quality */ + if (cpi->active_worst_quality <= cpi->active_best_quality) { + cpi->active_worst_quality = cpi->active_best_quality + 1; + } + + if (cpi->active_worst_quality > 127) cpi->active_worst_quality = 127; + } + /* Unbuffered mode (eg. video conferencing) */ + else { + /* Set the active worst quality */ + cpi->active_worst_quality = cpi->worst_quality; + } + + /* Special trap for constrained quality mode + * "active_worst_quality" may never drop below cq level + * for any frame type. + */ + if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY && + cpi->active_worst_quality < cpi->cq_target_quality) { + cpi->active_worst_quality = cpi->cq_target_quality; + } + } + + /* Test to see if we have to drop a frame + * The auto-drop frame code is only used in buffered mode. + * In unbufferd mode (eg vide conferencing) the descision to + * code or drop a frame is made outside the codec in response to real + * world comms or buffer considerations. + */ + if (cpi->drop_frames_allowed && + (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) && + ((cpi->common.frame_type != KEY_FRAME))) { + /* Check for a buffer underun-crisis in which case we have to drop + * a frame + */ + if ((cpi->buffer_level < 0)) { +#if 0 + FILE *f = fopen("dec.stt", "a"); + fprintf(f, "%10d %10d %10d %10d ***** BUFFER EMPTY\n", + (int) cpi->common.current_video_frame, + cpi->decimation_factor, cpi->common.horiz_scale, + (cpi->buffer_level * 100) / cpi->oxcf.optimal_buffer_level); + fclose(f); +#endif + cpi->drop_frame = 1; + + /* Update the buffer level variable. */ + cpi->bits_off_target += cpi->av_per_frame_bandwidth; + if (cpi->bits_off_target > cpi->oxcf.maximum_buffer_size) { + cpi->bits_off_target = (int)cpi->oxcf.maximum_buffer_size; + } + cpi->buffer_level = cpi->bits_off_target; + + if (cpi->oxcf.number_of_layers > 1) { + unsigned int i; + + // Propagate bits saved by dropping the frame to higher layers. + for (i = cpi->current_layer + 1; i < cpi->oxcf.number_of_layers; ++i) { + LAYER_CONTEXT *lc = &cpi->layer_context[i]; + lc->bits_off_target += (int)(lc->target_bandwidth / lc->framerate); + if (lc->bits_off_target > lc->maximum_buffer_size) { + lc->bits_off_target = lc->maximum_buffer_size; + } + lc->buffer_level = lc->bits_off_target; + } + } + } + } + + /* Adjust target frame size for Golden Frames: */ + if (cpi->oxcf.error_resilient_mode == 0 && + (cpi->frames_till_gf_update_due == 0) && !cpi->drop_frame) { + if (!cpi->gf_update_onepass_cbr) { + int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] + : cpi->oxcf.fixed_q; + + int gf_frame_usage = 0; /* Golden frame usage since last GF */ + int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] + + cpi->recent_ref_frame_usage[LAST_FRAME] + + cpi->recent_ref_frame_usage[GOLDEN_FRAME] + + cpi->recent_ref_frame_usage[ALTREF_FRAME]; + + int pct_gf_active = (100 * cpi->gf_active_count) / + (cpi->common.mb_rows * cpi->common.mb_cols); + + if (tot_mbs) { + gf_frame_usage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * + 100 / tot_mbs; + } + + if (pct_gf_active > gf_frame_usage) gf_frame_usage = pct_gf_active; + + /* Is a fixed manual GF frequency being used */ + if (cpi->auto_gold) { + /* For one pass throw a GF if recent frame intra usage is + * low or the GF usage is high + */ + if ((cpi->pass == 0) && + (cpi->this_frame_percent_intra < 15 || gf_frame_usage >= 5)) { + cpi->common.refresh_golden_frame = 1; + + /* Two pass GF descision */ + } else if (cpi->pass == 2) { + cpi->common.refresh_golden_frame = 1; + } + } + +#if 0 + + /* Debug stats */ + if (0) { + FILE *f; + + f = fopen("gf_usaget.stt", "a"); + fprintf(f, " %8ld %10ld %10ld %10ld %10ld\n", + cpi->common.current_video_frame, cpi->gfu_boost, + GFQ_ADJUSTMENT, cpi->gfu_boost, gf_frame_usage); + fclose(f); + } + +#endif + + if (cpi->common.refresh_golden_frame == 1) { +#if 0 + + if (0) { + FILE *f; + + f = fopen("GFexit.stt", "a"); + fprintf(f, "%8ld GF coded\n", cpi->common.current_video_frame); + fclose(f); + } + +#endif + + if (cpi->auto_adjust_gold_quantizer) { + calc_gf_params(cpi); + } + + /* If we are using alternate ref instead of gf then do not apply the + * boost It will instead be applied to the altref update Jims + * modified boost + */ + if (!cpi->source_alt_ref_active) { + if (cpi->oxcf.fixed_q < 0) { + if (cpi->pass == 2) { + /* The spend on the GF is defined in the two pass + * code for two pass encodes + */ + cpi->this_frame_target = cpi->per_frame_bandwidth; + } else { + int Boost = cpi->last_boost; + int frames_in_section = cpi->frames_till_gf_update_due + 1; + int allocation_chunks = (frames_in_section * 100) + (Boost - 100); + int bits_in_section = cpi->inter_frame_target * frames_in_section; + + /* Normalize Altboost and allocations chunck down to + * prevent overflow + */ + while (Boost > 1000) { + Boost /= 2; + allocation_chunks /= 2; + } + + /* Avoid loss of precision but avoid overflow */ + if ((bits_in_section >> 7) > allocation_chunks) { + cpi->this_frame_target = + Boost * (bits_in_section / allocation_chunks); + } else { + cpi->this_frame_target = + (Boost * bits_in_section) / allocation_chunks; + } + } + } else { + cpi->this_frame_target = + (estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0) * + cpi->last_boost) / + 100; + } + } else { + /* If there is an active ARF at this location use the minimum + * bits on this frame even if it is a contructed arf. + * The active maximum quantizer insures that an appropriate + * number of bits will be spent if needed for contstructed ARFs. + */ + cpi->this_frame_target = 0; + } + + cpi->current_gf_interval = cpi->frames_till_gf_update_due; + } + } else { + // Special case for 1 pass CBR: fixed gf period. + // TODO(marpan): Adjust this boost/interval logic. + // If gf_cbr_boost_pct is small (below threshold) set the flag + // gf_noboost_onepass_cbr = 1, which forces the gf to use the same + // rate correction factor as last. + cpi->gf_noboost_onepass_cbr = (cpi->oxcf.gf_cbr_boost_pct <= 100); + cpi->baseline_gf_interval = cpi->gf_interval_onepass_cbr; + // Skip this update if the zero_mvcount is low. + if (cpi->zeromv_count > (cpi->common.MBs >> 1)) { + cpi->common.refresh_golden_frame = 1; + cpi->this_frame_target = + (cpi->this_frame_target * (100 + cpi->oxcf.gf_cbr_boost_pct)) / 100; + } + cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; + cpi->current_gf_interval = cpi->frames_till_gf_update_due; + } + } + + cpi->per_frame_bandwidth = old_per_frame_bandwidth; +} + +void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var) { + int Q = cpi->common.base_qindex; + int correction_factor = 100; + double rate_correction_factor; + double adjustment_limit; + + int projected_size_based_on_q = 0; + + /* Clear down mmx registers to allow floating point in what follows */ + vpx_clear_system_state(); + + if (cpi->common.frame_type == KEY_FRAME) { + rate_correction_factor = cpi->key_frame_rate_correction_factor; + } else { + if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr && + (cpi->common.refresh_alt_ref_frame || + cpi->common.refresh_golden_frame)) { + rate_correction_factor = cpi->gf_rate_correction_factor; + } else { + rate_correction_factor = cpi->rate_correction_factor; + } + } + + /* 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 + */ + projected_size_based_on_q = + (int)(((.5 + rate_correction_factor * + vp8_bits_per_mb[cpi->common.frame_type][Q]) * + cpi->common.MBs) / + (1 << BPER_MB_NORMBITS)); + + /* Make some allowance for cpi->zbin_over_quant */ + if (cpi->mb.zbin_over_quant > 0) { + int Z = cpi->mb.zbin_over_quant; + double Factor = 0.99; + double factor_adjustment = 0.01 / 256.0; + + while (Z > 0) { + Z--; + projected_size_based_on_q = (int)(Factor * projected_size_based_on_q); + Factor += factor_adjustment; + + if (Factor >= 0.999) Factor = 0.999; + } + } + + /* Work out a size correction factor. */ + if (projected_size_based_on_q > 0) { + correction_factor = (int)((100 * (int64_t)cpi->projected_frame_size) / + projected_size_based_on_q); + } + + /* More heavily damped adjustment used if we have been oscillating + * either side of target + */ + switch (damp_var) { + case 0: adjustment_limit = 0.75; break; + case 1: adjustment_limit = 0.375; break; + case 2: + default: adjustment_limit = 0.25; break; + } + + if (correction_factor > 102) { + /* We are not already at the worst allowable quality */ + correction_factor = + (int)(100.5 + ((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)(100.5 - ((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; + } + } + + if (cpi->common.frame_type == KEY_FRAME) { + cpi->key_frame_rate_correction_factor = rate_correction_factor; + } else { + if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr && + (cpi->common.refresh_alt_ref_frame || + cpi->common.refresh_golden_frame)) { + cpi->gf_rate_correction_factor = rate_correction_factor; + } else { + cpi->rate_correction_factor = rate_correction_factor; + } + } +} + +static int limit_q_cbr_inter(int last_q, int current_q) { + int limit_down = 12; + if (last_q - current_q > limit_down) + return (last_q - limit_down); + else + return current_q; +} + +int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame) { + int Q = cpi->active_worst_quality; + + if (cpi->force_maxqp == 1) { + cpi->active_worst_quality = cpi->worst_quality; + return cpi->worst_quality; + } + /* Reset Zbin OQ value */ + cpi->mb.zbin_over_quant = 0; + + if (cpi->oxcf.fixed_q >= 0) { + Q = cpi->oxcf.fixed_q; + + if (cpi->common.frame_type == KEY_FRAME) { + Q = cpi->oxcf.key_q; + } else if (cpi->oxcf.number_of_layers == 1 && + cpi->common.refresh_alt_ref_frame && + !cpi->gf_noboost_onepass_cbr) { + Q = cpi->oxcf.alt_q; + } else if (cpi->oxcf.number_of_layers == 1 && + cpi->common.refresh_golden_frame && + !cpi->gf_noboost_onepass_cbr) { + Q = cpi->oxcf.gold_q; + } + } else { + int i; + int last_error = INT_MAX; + int target_bits_per_mb; + int bits_per_mb_at_this_q; + double correction_factor; + + /* Select the appropriate correction factor based upon type of frame. */ + if (cpi->common.frame_type == KEY_FRAME) { + correction_factor = cpi->key_frame_rate_correction_factor; + } else { + if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr && + (cpi->common.refresh_alt_ref_frame || + cpi->common.refresh_golden_frame)) { + correction_factor = cpi->gf_rate_correction_factor; + } else { + correction_factor = cpi->rate_correction_factor; + } + } + + /* Calculate required scaling factor based on target frame size and + * size of frame produced using previous Q + */ + if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS)) { + /* Case where we would overflow int */ + target_bits_per_mb = (target_bits_per_frame / cpi->common.MBs) + << BPER_MB_NORMBITS; + } else { + target_bits_per_mb = + (target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs; + } + + i = cpi->active_best_quality; + + do { + bits_per_mb_at_this_q = + (int)(.5 + + correction_factor * vp8_bits_per_mb[cpi->common.frame_type][i]); + + 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 <= cpi->active_worst_quality); + + /* If we are at MAXQ then enable Q over-run which seeks to claw + * back additional bits through things like the RD multiplier + * and zero bin size. + */ + if (Q >= MAXQ) { + int zbin_oqmax; + + double Factor = 0.99; + double factor_adjustment = 0.01 / 256.0; + + if (cpi->common.frame_type == KEY_FRAME) { + zbin_oqmax = 0; + } else if (cpi->oxcf.number_of_layers == 1 && + !cpi->gf_noboost_onepass_cbr && + (cpi->common.refresh_alt_ref_frame || + (cpi->common.refresh_golden_frame && + !cpi->source_alt_ref_active))) { + zbin_oqmax = 16; + } else { + zbin_oqmax = ZBIN_OQ_MAX; + } + + /*{ + double Factor = + (double)target_bits_per_mb/(double)bits_per_mb_at_this_q; + double Oq; + + Factor = Factor/1.2683; + + Oq = pow( Factor, (1.0/-0.165) ); + + if ( Oq > zbin_oqmax ) + Oq = zbin_oqmax; + + cpi->zbin_over_quant = (int)Oq; + }*/ + + /* Each incrment in the zbin is assumed to have a fixed effect + * on bitrate. This is not of course true. The effect will be + * highly clip dependent and may well have sudden steps. The + * idea here is to acheive higher effective quantizers than the + * normal maximum by expanding the zero bin and hence + * decreasing the number of low magnitude non zero coefficients. + */ + while (cpi->mb.zbin_over_quant < zbin_oqmax) { + cpi->mb.zbin_over_quant++; + + if (cpi->mb.zbin_over_quant > zbin_oqmax) { + cpi->mb.zbin_over_quant = zbin_oqmax; + } + + /* Adjust bits_per_mb_at_this_q estimate */ + bits_per_mb_at_this_q = (int)(Factor * bits_per_mb_at_this_q); + Factor += factor_adjustment; + + if (Factor >= 0.999) Factor = 0.999; + + /* Break out if we get down to the target rate */ + if (bits_per_mb_at_this_q <= target_bits_per_mb) break; + } + } + } + + // Limit decrease in Q for 1 pass CBR screen content mode. + if (cpi->common.frame_type != KEY_FRAME && cpi->pass == 0 && + cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER && + cpi->oxcf.screen_content_mode) + Q = limit_q_cbr_inter(cpi->last_q[1], Q); + + return Q; +} + +static int estimate_keyframe_frequency(VP8_COMP *cpi) { + int i; + + /* Average key frame frequency */ + int av_key_frame_frequency = 0; + + /* First key frame at start of sequence is a special case. We have no + * frequency data. + */ + if (cpi->key_frame_count == 1) { + /* Assume a default of 1 kf every 2 seconds, or the max kf interval, + * whichever is smaller. + */ + int key_freq = cpi->oxcf.key_freq > 0 ? cpi->oxcf.key_freq : 1; + av_key_frame_frequency = 1 + (int)cpi->output_framerate * 2; + + if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq) { + av_key_frame_frequency = key_freq; + } + + cpi->prior_key_frame_distance[KEY_FRAME_CONTEXT - 1] = + av_key_frame_frequency; + } else { + unsigned int total_weight = 0; + int last_kf_interval = + (cpi->frames_since_key > 0) ? cpi->frames_since_key : 1; + + /* reset keyframe context and calculate weighted average of last + * KEY_FRAME_CONTEXT keyframes + */ + for (i = 0; i < KEY_FRAME_CONTEXT; ++i) { + if (i < KEY_FRAME_CONTEXT - 1) { + cpi->prior_key_frame_distance[i] = cpi->prior_key_frame_distance[i + 1]; + } else { + cpi->prior_key_frame_distance[i] = last_kf_interval; + } + + av_key_frame_frequency += + prior_key_frame_weight[i] * cpi->prior_key_frame_distance[i]; + total_weight += prior_key_frame_weight[i]; + } + + av_key_frame_frequency /= total_weight; + } + // TODO (marpan): Given the checks above, |av_key_frame_frequency| + // should always be above 0. But for now we keep the sanity check in. + if (av_key_frame_frequency == 0) av_key_frame_frequency = 1; + return av_key_frame_frequency; +} + +void vp8_adjust_key_frame_context(VP8_COMP *cpi) { + /* Clear down mmx registers to allow floating point in what follows */ + vpx_clear_system_state(); + + /* Do we have any key frame overspend to recover? */ + /* Two-pass overspend handled elsewhere. */ + if ((cpi->pass != 2) && + (cpi->projected_frame_size > cpi->per_frame_bandwidth)) { + int overspend; + + /* Update the count of key frame overspend to be recovered in + * subsequent frames. A portion of the KF overspend is treated as gf + * overspend (and hence recovered more quickly) as the kf is also a + * gf. Otherwise the few frames following each kf tend to get more + * bits allocated than those following other gfs. + */ + overspend = (cpi->projected_frame_size - cpi->per_frame_bandwidth); + + if (cpi->oxcf.number_of_layers > 1) { + cpi->kf_overspend_bits += overspend; + } else { + cpi->kf_overspend_bits += overspend * 7 / 8; + cpi->gf_overspend_bits += overspend * 1 / 8; + } + + /* Work out how much to try and recover per frame. */ + cpi->kf_bitrate_adjustment = + cpi->kf_overspend_bits / estimate_keyframe_frequency(cpi); + } + + cpi->frames_since_key = 0; + cpi->key_frame_count++; +} + +void vp8_compute_frame_size_bounds(VP8_COMP *cpi, int *frame_under_shoot_limit, + int *frame_over_shoot_limit) { + /* Set-up bounds on acceptable frame size: */ + if (cpi->oxcf.fixed_q >= 0) { + /* Fixed Q scenario: frame size never outranges target + * (there is no target!) + */ + *frame_under_shoot_limit = 0; + *frame_over_shoot_limit = INT_MAX; + } else { + const int64_t this_frame_target = cpi->this_frame_target; + int64_t over_shoot_limit, under_shoot_limit; + + if (cpi->common.frame_type == KEY_FRAME) { + over_shoot_limit = this_frame_target * 9 / 8; + under_shoot_limit = this_frame_target * 7 / 8; + } else { + if (cpi->oxcf.number_of_layers > 1 || cpi->common.refresh_alt_ref_frame || + cpi->common.refresh_golden_frame) { + over_shoot_limit = this_frame_target * 9 / 8; + under_shoot_limit = this_frame_target * 7 / 8; + } else { + /* For CBR take buffer fullness into account */ + if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) { + if (cpi->buffer_level >= ((cpi->oxcf.optimal_buffer_level + + cpi->oxcf.maximum_buffer_size) >> + 1)) { + /* Buffer is too full so relax overshoot and tighten + * undershoot + */ + over_shoot_limit = this_frame_target * 12 / 8; + under_shoot_limit = this_frame_target * 6 / 8; + } else if (cpi->buffer_level <= + (cpi->oxcf.optimal_buffer_level >> 1)) { + /* Buffer is too low so relax undershoot and tighten + * overshoot + */ + over_shoot_limit = this_frame_target * 10 / 8; + under_shoot_limit = this_frame_target * 4 / 8; + } else { + over_shoot_limit = this_frame_target * 11 / 8; + under_shoot_limit = this_frame_target * 5 / 8; + } + } + /* VBR and CQ mode */ + /* Note that tighter restrictions here can help quality + * but hurt encode speed + */ + else { + /* Stron overshoot limit for constrained quality */ + if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) { + over_shoot_limit = this_frame_target * 11 / 8; + under_shoot_limit = this_frame_target * 2 / 8; + } else { + over_shoot_limit = this_frame_target * 11 / 8; + under_shoot_limit = this_frame_target * 5 / 8; + } + } + } + } + + /* For very small rate targets where the fractional adjustment + * (eg * 7/8) may be tiny make sure there is at least a minimum + * range. + */ + over_shoot_limit += 200; + under_shoot_limit -= 200; + if (under_shoot_limit < 0) under_shoot_limit = 0; + if (under_shoot_limit > INT_MAX) under_shoot_limit = INT_MAX; + if (over_shoot_limit > INT_MAX) over_shoot_limit = INT_MAX; + *frame_under_shoot_limit = (int)under_shoot_limit; + *frame_over_shoot_limit = (int)over_shoot_limit; + } +} + +/* return of 0 means drop frame */ +int vp8_pick_frame_size(VP8_COMP *cpi) { + VP8_COMMON *cm = &cpi->common; + + if (cm->frame_type == KEY_FRAME) { + calc_iframe_target_size(cpi); + } else { + calc_pframe_target_size(cpi); + + /* Check if we're dropping the frame: */ + if (cpi->drop_frame) { + cpi->drop_frame = 0; + return 0; + } + } + return 1; +} +// If this just encoded frame (mcomp/transform/quant, but before loopfilter and +// pack_bitstream) has large overshoot, and was not being encoded close to the +// max QP, then drop this frame and force next frame to be encoded at max QP. +// Allow this for screen_content_mode = 2, or if drop frames is allowed. +// TODO(marpan): Should do this exit condition during the encode_frame +// (i.e., halfway during the encoding of the frame) to save cycles. +int vp8_drop_encodedframe_overshoot(VP8_COMP *cpi, int Q) { + int force_drop_overshoot = 0; +#if CONFIG_MULTI_RES_ENCODING + // Only check for dropping due to overshoot on the lowest stream. + // If the lowest stream of the multi-res encoding was dropped due to + // overshoot, then force dropping on all upper layer streams + // (mr_encoder_id > 0). + LOWER_RES_FRAME_INFO *low_res_frame_info = + (LOWER_RES_FRAME_INFO *)cpi->oxcf.mr_low_res_mode_info; + if (cpi->oxcf.mr_total_resolutions > 1 && cpi->oxcf.mr_encoder_id > 0) { + force_drop_overshoot = low_res_frame_info->is_frame_dropped_overshoot_maxqp; + if (!force_drop_overshoot) { + cpi->force_maxqp = 0; + cpi->frames_since_last_drop_overshoot++; + return 0; + } + } +#endif + if (cpi->common.frame_type != KEY_FRAME && + (cpi->oxcf.screen_content_mode == 2 || + (cpi->drop_frames_allowed && + (force_drop_overshoot || + (cpi->rate_correction_factor < (8.0f * MIN_BPB_FACTOR) && + cpi->frames_since_last_drop_overshoot > (int)cpi->framerate))))) { + // Note: the "projected_frame_size" from encode_frame() only gives estimate + // of mode/motion vector rate (in non-rd mode): so below we only require + // that projected_frame_size is somewhat greater than per-frame-bandwidth, + // but add additional condition with high threshold on prediction residual. + + // QP threshold: only allow dropping if we are not close to qp_max. + int thresh_qp = 3 * cpi->worst_quality >> 2; + // Rate threshold, in bytes. + int thresh_rate = 2 * (cpi->av_per_frame_bandwidth >> 3); + // Threshold for the average (over all macroblocks) of the pixel-sum + // residual error over 16x16 block. + int thresh_pred_err_mb = (200 << 4); + int pred_err_mb = (int)(cpi->mb.prediction_error / cpi->common.MBs); + // Reduce/ignore thresh_rate if pred_err_mb much larger than its threshold, + // give more weight to pred_err metric for overshoot detection. + if (cpi->drop_frames_allowed && pred_err_mb > (thresh_pred_err_mb << 4)) + thresh_rate = thresh_rate >> 3; + if ((Q < thresh_qp && cpi->projected_frame_size > thresh_rate && + pred_err_mb > thresh_pred_err_mb && + pred_err_mb > 2 * cpi->last_pred_err_mb) || + force_drop_overshoot) { + unsigned int i; + double new_correction_factor; + int target_bits_per_mb; + const int target_size = cpi->av_per_frame_bandwidth; + // Flag to indicate we will force next frame to be encoded at max QP. + cpi->force_maxqp = 1; + // Reset the buffer levels. + cpi->buffer_level = cpi->oxcf.optimal_buffer_level; + cpi->bits_off_target = cpi->oxcf.optimal_buffer_level; + // Compute a new rate correction factor, corresponding to the current + // target frame size and max_QP, and adjust the rate correction factor + // upwards, if needed. + // This is to prevent a bad state where the re-encoded frame at max_QP + // undershoots significantly, and then we end up dropping every other + // frame because the QP/rate_correction_factor may have been too low + // before the drop and then takes too long to come up. + if (target_size >= (INT_MAX >> BPER_MB_NORMBITS)) { + target_bits_per_mb = (target_size / cpi->common.MBs) + << BPER_MB_NORMBITS; + } else { + target_bits_per_mb = + (target_size << BPER_MB_NORMBITS) / cpi->common.MBs; + } + // Rate correction factor based on target_size_per_mb and max_QP. + new_correction_factor = + (double)target_bits_per_mb / + (double)vp8_bits_per_mb[INTER_FRAME][cpi->worst_quality]; + if (new_correction_factor > cpi->rate_correction_factor) { + cpi->rate_correction_factor = + VPXMIN(2.0 * cpi->rate_correction_factor, new_correction_factor); + } + if (cpi->rate_correction_factor > MAX_BPB_FACTOR) { + cpi->rate_correction_factor = MAX_BPB_FACTOR; + } + // Drop this frame: update frame counters. + cpi->common.current_video_frame++; + cpi->frames_since_key++; + cpi->temporal_pattern_counter++; + cpi->frames_since_last_drop_overshoot = 0; + if (cpi->oxcf.number_of_layers > 1) { + // Set max_qp and rate correction for all temporal layers if overshoot + // is detected. + for (i = 0; i < cpi->oxcf.number_of_layers; ++i) { + LAYER_CONTEXT *lc = &cpi->layer_context[i]; + lc->force_maxqp = 1; + lc->frames_since_last_drop_overshoot = 0; + lc->rate_correction_factor = cpi->rate_correction_factor; + } + } +#if CONFIG_MULTI_RES_ENCODING + if (cpi->oxcf.mr_total_resolutions > 1) + low_res_frame_info->is_frame_dropped_overshoot_maxqp = 1; +#endif + return 1; + } + cpi->force_maxqp = 0; + cpi->frames_since_last_drop_overshoot++; +#if CONFIG_MULTI_RES_ENCODING + if (cpi->oxcf.mr_total_resolutions > 1) + low_res_frame_info->is_frame_dropped_overshoot_maxqp = 0; +#endif + return 0; + } + cpi->force_maxqp = 0; + cpi->frames_since_last_drop_overshoot++; +#if CONFIG_MULTI_RES_ENCODING + if (cpi->oxcf.mr_total_resolutions > 1) + low_res_frame_info->is_frame_dropped_overshoot_maxqp = 0; +#endif + return 0; +} |