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Diffstat (limited to 'libvpx/vp8/encoder/ratectrl.c')
| -rw-r--r-- | libvpx/vp8/encoder/ratectrl.c | 1534 |
1 files changed, 1534 insertions, 0 deletions
diff --git a/libvpx/vp8/encoder/ratectrl.c b/libvpx/vp8/encoder/ratectrl.c new file mode 100644 index 0000000..77c1c5a --- /dev/null +++ b/libvpx/vp8/encoder/ratectrl.c @@ -0,0 +1,1534 @@ +/* + * 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" + + +#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, +}; + +/* % adjustment to target kf size based on seperation from previous frame */ +static const int kf_boost_seperation_adjustment[16] = +{ + 30, 40, 50, 55, 60, 65, 70, 75, + 80, 85, 90, 95, 100, 100, 100, 100, +}; + + +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->common.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->common.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); + + vpx_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! + */ + vpx_memcpy(&cpi->lfc_a, &cpi->common.fc, sizeof(cpi->common.fc)); + vpx_memcpy(&cpi->lfc_g, &cpi->common.fc, sizeof(cpi->common.fc)); + vpx_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 */ + vp8_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 = 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 = MAX(initial_boost, (int)(2 * cpi->output_frame_rate - 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_frame_rate / 2) + kf_boost = (int)(kf_boost + * cpi->frames_since_key / (cpi->output_frame_rate / 2)); + + /* Minimal target size is |2* per_frame_bandwidth|. */ + if (kf_boost < 16) + kf_boost = 16; + + target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4; + } + + + if (cpi->oxcf.rc_max_intra_bitrate_pct) + { + unsigned int max_rate = cpi->per_frame_bandwidth + * cpi->oxcf.rc_max_intra_bitrate_pct / 100; + + if (target > max_rate) + target = max_rate; + } + + cpi->this_frame_target = (int)target; + + /* TODO: if we separate rate targeting from Q targetting, 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_useage = 0; /* Golden frame useage 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_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs; + + if (pct_gf_active > gf_frame_useage) + gf_frame_useage = 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 useage */ + 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_useage] / 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_useage] > cpi->frames_till_gf_update_due) + cpi->frames_till_gf_update_due = gf_interval_table[gf_frame_useage]; + + 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 Adjustment; + 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 + { + /* 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)) + { + int 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->common.frames_since_golden == (cpi->current_gf_interval >> 1)) + cpi->this_frame_target += ((cpi->current_gf_interval - 1) * 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 -= + (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; + + 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; + + cpi->this_frame_target += (cpi->this_frame_target * + percent_high) / 200; + + /* 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; + } + } + + /* Adjust target frame size for Golden Frames: */ + if (cpi->oxcf.error_resilient_mode == 0 && + (cpi->frames_till_gf_update_due == 0) && !cpi->drop_frame) + { + int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q; + + int gf_frame_useage = 0; /* Golden frame useage 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_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs; + + if (pct_gf_active > gf_frame_useage) + gf_frame_useage = 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 useage is + * low or the GF useage is high + */ + if ((cpi->pass == 0) && (cpi->this_frame_percent_intra < 15 || gf_frame_useage >= 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_useaget.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_useage); + 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; + + } + /* 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. + */ + else + { + cpi->this_frame_target = 0; + } + + 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 */ + vp8_clear_system_state(); + + if (cpi->common.frame_type == KEY_FRAME) + { + rate_correction_factor = cpi->key_frame_rate_correction_factor; + } + else + { + if (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->zbin_over_quant > 0) + { + int Z = cpi->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 = (100 * 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->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; + } +} + + +int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame) +{ + int Q = cpi->active_worst_quality; + + /* Reset Zbin OQ value */ + cpi->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->common.refresh_alt_ref_frame) + { + Q = cpi->oxcf.alt_q; + } + else if (cpi->common.refresh_golden_frame) + { + 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->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->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->zbin_over_quant < zbin_oqmax) + { + cpi->zbin_over_quant ++; + + if (cpi->zbin_over_quant > zbin_oqmax) + cpi->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; + } + + } + } + + 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 = (int)cpi->output_frame_rate * 2; + + if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq) + av_key_frame_frequency = cpi->oxcf.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; + + } + 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 */ + vp8_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 + { + if (cpi->common.frame_type == KEY_FRAME) + { + *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8; + *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8; + } + else + { + if (cpi->oxcf.number_of_layers > 1 || + cpi->common.refresh_alt_ref_frame || + cpi->common.refresh_golden_frame) + { + *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8; + *frame_under_shoot_limit = cpi->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 + */ + *frame_over_shoot_limit = cpi->this_frame_target * 12 / 8; + *frame_under_shoot_limit = cpi->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 + */ + *frame_over_shoot_limit = cpi->this_frame_target * 10 / 8; + *frame_under_shoot_limit = cpi->this_frame_target * 4 / 8; + } + else + { + *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8; + *frame_under_shoot_limit = cpi->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) + { + *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8; + *frame_under_shoot_limit = cpi->this_frame_target * 2 / 8; + } + else + { + *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8; + *frame_under_shoot_limit = cpi->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. + */ + *frame_over_shoot_limit += 200; + *frame_under_shoot_limit -= 200; + if ( *frame_under_shoot_limit < 0 ) + *frame_under_shoot_limit = 0; + + } +} + + +/* 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; +} |