2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
18 #include "vp8/common/common.h"
20 #include "vp8/common/entropymode.h"
21 #include "vpx_mem/vpx_mem.h"
22 #include "vp8/common/systemdependent.h"
24 #include "vpx_dsp/vpx_dsp_common.h"
25 #include "vpx_ports/system_state.h"
27 #define MIN_BPB_FACTOR 0.01
28 #define MAX_BPB_FACTOR 50
30 extern const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES];
33 extern int y_modes[5];
34 extern int uv_modes[4];
35 extern int b_modes[10];
37 extern int inter_y_modes[10];
38 extern int inter_uv_modes[4];
39 extern int inter_b_modes[10];
42 /* Bits Per MB at different Q (Multiplied by 512) */
43 #define BPER_MB_NORMBITS 9
45 /* Work in progress recalibration of baseline rate tables based on
46 * the assumption that bits per mb is inversely proportional to the
49 const int vp8_bits_per_mb[2][QINDEX_RANGE] = {
50 /* Intra case 450000/Qintra */
52 1125000, 900000, 750000, 642857, 562500, 500000, 450000, 450000, 409090,
53 375000, 346153, 321428, 300000, 281250, 264705, 264705, 250000, 236842,
54 225000, 225000, 214285, 214285, 204545, 204545, 195652, 195652, 187500,
55 180000, 180000, 173076, 166666, 160714, 155172, 150000, 145161, 140625,
56 136363, 132352, 128571, 125000, 121621, 121621, 118421, 115384, 112500,
57 109756, 107142, 104651, 102272, 100000, 97826, 97826, 95744, 93750,
58 91836, 90000, 88235, 86538, 84905, 83333, 81818, 80357, 78947,
59 77586, 76271, 75000, 73770, 72580, 71428, 70312, 69230, 68181,
60 67164, 66176, 65217, 64285, 63380, 62500, 61643, 60810, 60000,
61 59210, 59210, 58441, 57692, 56962, 56250, 55555, 54878, 54216,
62 53571, 52941, 52325, 51724, 51136, 50561, 49450, 48387, 47368,
63 46875, 45918, 45000, 44554, 44117, 43269, 42452, 41666, 40909,
64 40178, 39473, 38793, 38135, 36885, 36290, 35714, 35156, 34615,
65 34090, 33582, 33088, 32608, 32142, 31468, 31034, 30405, 29801,
68 /* Inter case 285000/Qinter */
70 712500, 570000, 475000, 407142, 356250, 316666, 285000, 259090, 237500,
71 219230, 203571, 190000, 178125, 167647, 158333, 150000, 142500, 135714,
72 129545, 123913, 118750, 114000, 109615, 105555, 101785, 98275, 95000,
73 91935, 89062, 86363, 83823, 81428, 79166, 77027, 75000, 73076,
74 71250, 69512, 67857, 66279, 64772, 63333, 61956, 60638, 59375,
75 58163, 57000, 55882, 54807, 53773, 52777, 51818, 50892, 50000,
76 49137, 47500, 45967, 44531, 43181, 41911, 40714, 39583, 38513,
77 37500, 36538, 35625, 34756, 33928, 33139, 32386, 31666, 30978,
78 30319, 29687, 29081, 28500, 27941, 27403, 26886, 26388, 25909,
79 25446, 25000, 24568, 23949, 23360, 22800, 22265, 21755, 21268,
80 20802, 20357, 19930, 19520, 19127, 18750, 18387, 18037, 17701,
81 17378, 17065, 16764, 16473, 16101, 15745, 15405, 15079, 14766,
82 14467, 14179, 13902, 13636, 13380, 13133, 12895, 12666, 12445,
83 12179, 11924, 11632, 11445, 11220, 11003, 10795, 10594, 10401,
88 static const int kf_boost_qadjustment[QINDEX_RANGE] = {
89 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142,
90 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157,
91 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172,
92 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187,
93 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 200, 201,
94 201, 202, 203, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207, 208, 208,
95 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216,
96 216, 217, 217, 218, 218, 219, 219, 220, 220, 220, 220, 220, 220, 220, 220,
97 220, 220, 220, 220, 220, 220, 220, 220,
100 /* #define GFQ_ADJUSTMENT (Q+100) */
101 #define GFQ_ADJUSTMENT vp8_gf_boost_qadjustment[Q]
102 const int vp8_gf_boost_qadjustment[QINDEX_RANGE] = {
103 80, 82, 84, 86, 88, 90, 92, 94, 96, 97, 98, 99, 100, 101, 102,
104 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
105 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132,
106 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
107 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162,
108 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
109 178, 179, 180, 181, 182, 183, 184, 184, 185, 185, 186, 186, 187, 187, 188,
110 188, 189, 189, 190, 190, 191, 191, 192, 192, 193, 193, 194, 194, 194, 194,
111 195, 195, 196, 196, 197, 197, 198, 198
115 const int vp8_gf_boost_qadjustment[QINDEX_RANGE] =
117 100,101,102,103,104,105,105,106,
118 106,107,107,108,109,109,110,111,
119 112,113,114,115,116,117,118,119,
120 120,121,122,123,124,125,126,127,
121 128,129,130,131,132,133,134,135,
122 136,137,138,139,140,141,142,143,
123 144,145,146,147,148,149,150,151,
124 152,153,154,155,156,157,158,159,
125 160,161,162,163,164,165,166,167,
126 168,169,170,170,171,171,172,172,
127 173,173,173,174,174,174,175,175,
128 175,176,176,176,177,177,177,177,
129 178,178,179,179,180,180,181,181,
130 182,182,183,183,184,184,185,185,
131 186,186,187,187,188,188,189,189,
132 190,190,191,191,192,192,193,193,
136 static const int kf_gf_boost_qlimits[QINDEX_RANGE] = {
137 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220,
138 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275, 280, 285, 290, 295,
139 300, 305, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430,
140 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580,
141 590, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
142 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
143 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
144 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
145 600, 600, 600, 600, 600, 600, 600, 600,
148 static const int gf_adjust_table[101] = {
149 100, 115, 130, 145, 160, 175, 190, 200, 210, 220, 230, 240, 260, 270, 280,
150 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 400, 400, 400,
151 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
152 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
153 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
154 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
155 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
158 static const int gf_intra_usage_adjustment[20] = {
159 125, 120, 115, 110, 105, 100, 95, 85, 80, 75,
160 70, 65, 60, 55, 50, 50, 50, 50, 50, 50,
163 static const int gf_interval_table[101] = {
164 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
165 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8,
166 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
167 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
168 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
169 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
172 static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3,
175 void vp8_save_coding_context(VP8_COMP *cpi) {
176 CODING_CONTEXT *const cc = &cpi->coding_context;
178 /* Stores a snapshot of key state variables which can subsequently be
179 * restored with a call to vp8_restore_coding_context. These functions are
180 * intended for use in a re-code loop in vp8_compress_frame where the
181 * quantizer value is adjusted between loop iterations.
184 cc->frames_since_key = cpi->frames_since_key;
185 cc->filter_level = cpi->common.filter_level;
186 cc->frames_till_gf_update_due = cpi->frames_till_gf_update_due;
187 cc->frames_since_golden = cpi->frames_since_golden;
189 vp8_copy(cc->mvc, cpi->common.fc.mvc);
190 vp8_copy(cc->mvcosts, cpi->rd_costs.mvcosts);
192 vp8_copy(cc->ymode_prob, cpi->common.fc.ymode_prob);
193 vp8_copy(cc->uv_mode_prob, cpi->common.fc.uv_mode_prob);
195 vp8_copy(cc->ymode_count, cpi->mb.ymode_count);
196 vp8_copy(cc->uv_mode_count, cpi->mb.uv_mode_count);
200 vp8_copy(cc->y_modes, y_modes);
201 vp8_copy(cc->uv_modes, uv_modes);
202 vp8_copy(cc->b_modes, b_modes);
203 vp8_copy(cc->inter_y_modes, inter_y_modes);
204 vp8_copy(cc->inter_uv_modes, inter_uv_modes);
205 vp8_copy(cc->inter_b_modes, inter_b_modes);
208 cc->this_frame_percent_intra = cpi->this_frame_percent_intra;
211 void vp8_restore_coding_context(VP8_COMP *cpi) {
212 CODING_CONTEXT *const cc = &cpi->coding_context;
214 /* Restore key state variables to the snapshot state stored in the
215 * previous call to vp8_save_coding_context.
218 cpi->frames_since_key = cc->frames_since_key;
219 cpi->common.filter_level = cc->filter_level;
220 cpi->frames_till_gf_update_due = cc->frames_till_gf_update_due;
221 cpi->frames_since_golden = cc->frames_since_golden;
223 vp8_copy(cpi->common.fc.mvc, cc->mvc);
225 vp8_copy(cpi->rd_costs.mvcosts, cc->mvcosts);
227 vp8_copy(cpi->common.fc.ymode_prob, cc->ymode_prob);
228 vp8_copy(cpi->common.fc.uv_mode_prob, cc->uv_mode_prob);
230 vp8_copy(cpi->mb.ymode_count, cc->ymode_count);
231 vp8_copy(cpi->mb.uv_mode_count, cc->uv_mode_count);
235 vp8_copy(y_modes, cc->y_modes);
236 vp8_copy(uv_modes, cc->uv_modes);
237 vp8_copy(b_modes, cc->b_modes);
238 vp8_copy(inter_y_modes, cc->inter_y_modes);
239 vp8_copy(inter_uv_modes, cc->inter_uv_modes);
240 vp8_copy(inter_b_modes, cc->inter_b_modes);
243 cpi->this_frame_percent_intra = cc->this_frame_percent_intra;
246 void vp8_setup_key_frame(VP8_COMP *cpi) {
247 /* Setup for Key frame: */
249 vp8_default_coef_probs(&cpi->common);
251 memcpy(cpi->common.fc.mvc, vp8_default_mv_context,
252 sizeof(vp8_default_mv_context));
254 int flag[2] = { 1, 1 };
255 vp8_build_component_cost_table(
256 cpi->mb.mvcost, (const MV_CONTEXT *)cpi->common.fc.mvc, flag);
259 /* Make sure we initialize separate contexts for altref,gold, and normal.
260 * TODO shouldn't need 3 different copies of structure to do this!
262 memcpy(&cpi->lfc_a, &cpi->common.fc, sizeof(cpi->common.fc));
263 memcpy(&cpi->lfc_g, &cpi->common.fc, sizeof(cpi->common.fc));
264 memcpy(&cpi->lfc_n, &cpi->common.fc, sizeof(cpi->common.fc));
266 cpi->common.filter_level = cpi->common.base_qindex * 3 / 8;
268 /* Provisional interval before next GF */
269 if (cpi->auto_gold) {
270 cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
272 cpi->frames_till_gf_update_due = DEFAULT_GF_INTERVAL;
275 cpi->common.refresh_golden_frame = 1;
276 cpi->common.refresh_alt_ref_frame = 1;
279 static int estimate_bits_at_q(int frame_kind, int Q, int MBs,
280 double correction_factor) {
281 int Bpm = (int)(.5 + correction_factor * vp8_bits_per_mb[frame_kind][Q]);
283 /* Attempt to retain reasonable accuracy without overflow. The cutoff is
284 * chosen such that the maximum product of Bpm and MBs fits 31 bits. The
285 * largest Bpm takes 20 bits.
287 if (MBs > (1 << 11)) {
288 return (Bpm >> BPER_MB_NORMBITS) * MBs;
290 return (Bpm * MBs) >> BPER_MB_NORMBITS;
294 static void calc_iframe_target_size(VP8_COMP *cpi) {
295 /* boost defaults to half second */
299 /* Clear down mmx registers to allow floating point in what follows */
300 vpx_clear_system_state();
302 if (cpi->oxcf.fixed_q >= 0) {
303 int Q = cpi->oxcf.key_q;
305 target = estimate_bits_at_q(INTRA_FRAME, Q, cpi->common.MBs,
306 cpi->key_frame_rate_correction_factor);
307 } else if (cpi->pass == 2) {
308 /* New Two pass RC */
309 target = cpi->per_frame_bandwidth;
311 /* First Frame is a special case */
312 else if (cpi->common.current_video_frame == 0) {
313 /* 1 Pass there is no information on which to base size so use
314 * bandwidth per second * fraction of the initial buffer
317 target = cpi->oxcf.starting_buffer_level / 2;
319 if (target > cpi->oxcf.target_bandwidth * 3 / 2) {
320 target = cpi->oxcf.target_bandwidth * 3 / 2;
323 /* if this keyframe was forced, use a more recent Q estimate */
324 int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY) ? cpi->avg_frame_qindex
327 int initial_boost = 32; /* |3.0 * per_frame_bandwidth| */
328 /* Boost depends somewhat on frame rate: only used for 1 layer case. */
329 if (cpi->oxcf.number_of_layers == 1) {
330 kf_boost = VPXMAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
332 /* Initial factor: set target size to: |3.0 * per_frame_bandwidth|. */
333 kf_boost = initial_boost;
336 /* adjustment up based on q: this factor ranges from ~1.2 to 2.2. */
337 kf_boost = kf_boost * kf_boost_qadjustment[Q] / 100;
339 /* frame separation adjustment ( down) */
340 if (cpi->frames_since_key < cpi->output_framerate / 2) {
342 (int)(kf_boost * cpi->frames_since_key / (cpi->output_framerate / 2));
345 /* Minimal target size is |2* per_frame_bandwidth|. */
346 if (kf_boost < 16) kf_boost = 16;
348 target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4;
351 if (cpi->oxcf.rc_max_intra_bitrate_pct) {
352 unsigned int max_rate =
353 cpi->per_frame_bandwidth * cpi->oxcf.rc_max_intra_bitrate_pct / 100;
355 if (target > max_rate) target = max_rate;
358 cpi->this_frame_target = (int)target;
360 /* TODO: if we separate rate targeting from Q targetting, move this.
361 * Reset the active worst quality to the baseline value for key frames.
363 if (cpi->pass != 2) cpi->active_worst_quality = cpi->worst_quality;
369 f = fopen("kf_boost.stt", "a");
370 fprintf(f, " %8u %10d %10d %10d\n",
371 cpi->common.current_video_frame, cpi->gfu_boost, cpi->baseline_gf_interval, cpi->source_alt_ref_pending);
378 /* Do the best we can to define the parameters for the next GF based on what
379 * information we have available.
381 static void calc_gf_params(VP8_COMP *cpi) {
383 (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
386 int gf_frame_useage = 0; /* Golden frame useage since last GF */
387 int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
388 cpi->recent_ref_frame_usage[LAST_FRAME] +
389 cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
390 cpi->recent_ref_frame_usage[ALTREF_FRAME];
392 int pct_gf_active = (100 * cpi->gf_active_count) /
393 (cpi->common.mb_rows * cpi->common.mb_cols);
396 gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
397 cpi->recent_ref_frame_usage[ALTREF_FRAME]) *
401 if (pct_gf_active > gf_frame_useage) gf_frame_useage = pct_gf_active;
404 if (cpi->pass != 2) {
405 /* Single Pass lagged mode: TBD */
409 /* Single Pass compression: Has to use current and historical data */
412 /* Experimental code */
413 int index = cpi->one_pass_frame_index;
414 int frames_to_scan = (cpi->max_gf_interval <= MAX_LAG_BUFFERS) ? cpi->max_gf_interval : MAX_LAG_BUFFERS;
416 /* ************** Experimental code - incomplete */
418 double decay_val = 1.0;
419 double IIAccumulator = 0.0;
420 double last_iiaccumulator = 0.0;
423 cpi->one_pass_frame_index = cpi->common.current_video_frame%MAX_LAG_BUFFERS;
425 for ( i = 0; i < (frames_to_scan - 1); i++ )
428 index = MAX_LAG_BUFFERS;
431 if ( cpi->one_pass_frame_stats[index].frame_coded_error > 0.0 )
433 IIRatio = cpi->one_pass_frame_stats[index].frame_intra_error / cpi->one_pass_frame_stats[index].frame_coded_error;
435 if ( IIRatio > 30.0 )
441 IIAccumulator += IIRatio * decay_val;
443 decay_val = decay_val * cpi->one_pass_frame_stats[index].frame_pcnt_inter;
445 if ( (i > MIN_GF_INTERVAL) &&
446 ((IIAccumulator - last_iiaccumulator) < 2.0) )
450 last_iiaccumulator = IIAccumulator;
453 Boost = IIAccumulator*100.0/16.0;
454 cpi->baseline_gf_interval = i;
459 /*************************************************************/
462 /* Adjust boost based upon ambient Q */
463 Boost = GFQ_ADJUSTMENT;
465 /* Adjust based upon most recently measure intra useage */
467 gf_intra_usage_adjustment[(cpi->this_frame_percent_intra < 15)
468 ? cpi->this_frame_percent_intra
472 /* Adjust gf boost based upon GF usage since last GF */
473 Boost = Boost * gf_adjust_table[gf_frame_useage] / 100;
477 /* golden frame boost without recode loop often goes awry. be
478 * safe by keeping numbers down.
480 if (!cpi->sf.recode_loop) {
481 if (cpi->compressor_speed == 2) Boost = Boost / 2;
484 /* Apply an upper limit based on Q for 1 pass encodes */
485 if (Boost > kf_gf_boost_qlimits[Q] && (cpi->pass == 0)) {
486 Boost = kf_gf_boost_qlimits[Q];
488 /* Apply lower limits to boost. */
489 } else if (Boost < 110) {
493 /* Note the boost used */
494 cpi->last_boost = Boost;
497 /* Estimate next interval
498 * This is updated once the real frame size/boost is known.
500 if (cpi->oxcf.fixed_q == -1) {
501 if (cpi->pass == 2) { /* 2 Pass */
502 cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
503 } else { /* 1 Pass */
504 cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
506 if (cpi->last_boost > 750) cpi->frames_till_gf_update_due++;
508 if (cpi->last_boost > 1000) cpi->frames_till_gf_update_due++;
510 if (cpi->last_boost > 1250) cpi->frames_till_gf_update_due++;
512 if (cpi->last_boost >= 1500) cpi->frames_till_gf_update_due++;
514 if (gf_interval_table[gf_frame_useage] > cpi->frames_till_gf_update_due) {
515 cpi->frames_till_gf_update_due = gf_interval_table[gf_frame_useage];
518 if (cpi->frames_till_gf_update_due > cpi->max_gf_interval) {
519 cpi->frames_till_gf_update_due = cpi->max_gf_interval;
523 cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
527 if (cpi->pass != 2) {
528 /* For now Alt ref is not allowed except in 2 pass modes. */
529 cpi->source_alt_ref_pending = 0;
531 /*if ( cpi->oxcf.fixed_q == -1)
533 if ( cpi->oxcf.play_alternate && (cpi->last_boost > (100 +
534 (AF_THRESH*cpi->frames_till_gf_update_due)) ) )
535 cpi->source_alt_ref_pending = 1;
537 cpi->source_alt_ref_pending = 0;
542 static void calc_pframe_target_size(VP8_COMP *cpi) {
543 int min_frame_target;
544 int old_per_frame_bandwidth = cpi->per_frame_bandwidth;
546 if (cpi->current_layer > 0) {
547 cpi->per_frame_bandwidth =
548 cpi->layer_context[cpi->current_layer].avg_frame_size_for_layer;
551 min_frame_target = 0;
553 if (cpi->pass == 2) {
554 min_frame_target = cpi->min_frame_bandwidth;
556 if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5)) {
557 min_frame_target = cpi->av_per_frame_bandwidth >> 5;
559 } else if (min_frame_target < cpi->per_frame_bandwidth / 4) {
560 min_frame_target = cpi->per_frame_bandwidth / 4;
563 /* Special alt reference frame case */
564 if ((cpi->common.refresh_alt_ref_frame) &&
565 (cpi->oxcf.number_of_layers == 1)) {
566 if (cpi->pass == 2) {
567 /* Per frame bit target for the alt ref frame */
568 cpi->per_frame_bandwidth = cpi->twopass.gf_bits;
569 cpi->this_frame_target = cpi->per_frame_bandwidth;
572 /* One Pass ??? TBD */
575 /* Normal frames (gf,and inter) */
578 if (cpi->pass == 2) {
579 cpi->this_frame_target = cpi->per_frame_bandwidth;
584 /* Make rate adjustment to recover bits spent in key frame
585 * Test to see if the key frame inter data rate correction
586 * should still be in force
588 if (cpi->kf_overspend_bits > 0) {
589 Adjustment = (cpi->kf_bitrate_adjustment <= cpi->kf_overspend_bits)
590 ? cpi->kf_bitrate_adjustment
591 : cpi->kf_overspend_bits;
593 if (Adjustment > (cpi->per_frame_bandwidth - min_frame_target)) {
594 Adjustment = (cpi->per_frame_bandwidth - min_frame_target);
597 cpi->kf_overspend_bits -= Adjustment;
599 /* Calculate an inter frame bandwidth target for the next
600 * few frames designed to recover any extra bits spent on
603 cpi->this_frame_target = cpi->per_frame_bandwidth - Adjustment;
605 if (cpi->this_frame_target < min_frame_target) {
606 cpi->this_frame_target = min_frame_target;
609 cpi->this_frame_target = cpi->per_frame_bandwidth;
612 /* If appropriate make an adjustment to recover bits spent on a
615 if ((cpi->gf_overspend_bits > 0) &&
616 (cpi->this_frame_target > min_frame_target)) {
617 Adjustment = (cpi->non_gf_bitrate_adjustment <= cpi->gf_overspend_bits)
618 ? cpi->non_gf_bitrate_adjustment
619 : cpi->gf_overspend_bits;
621 if (Adjustment > (cpi->this_frame_target - min_frame_target)) {
622 Adjustment = (cpi->this_frame_target - min_frame_target);
625 cpi->gf_overspend_bits -= Adjustment;
626 cpi->this_frame_target -= Adjustment;
629 /* Apply small + and - boosts for non gf frames */
630 if ((cpi->last_boost > 150) && (cpi->frames_till_gf_update_due > 0) &&
631 (cpi->current_gf_interval >= (MIN_GF_INTERVAL << 1))) {
632 /* % Adjustment limited to the range 1% to 10% */
633 Adjustment = (cpi->last_boost - 100) >> 5;
635 if (Adjustment < 1) {
637 } else if (Adjustment > 10) {
641 /* Convert to bits */
642 Adjustment = (cpi->this_frame_target * Adjustment) / 100;
644 if (Adjustment > (cpi->this_frame_target - min_frame_target)) {
645 Adjustment = (cpi->this_frame_target - min_frame_target);
648 if (cpi->frames_since_golden == (cpi->current_gf_interval >> 1)) {
649 Adjustment = (cpi->current_gf_interval - 1) * Adjustment;
650 // Limit adjustment to 10% of current target.
651 if (Adjustment > (10 * cpi->this_frame_target) / 100) {
652 Adjustment = (10 * cpi->this_frame_target) / 100;
654 cpi->this_frame_target += Adjustment;
656 cpi->this_frame_target -= Adjustment;
662 /* Sanity check that the total sum of adjustments is not above the
663 * maximum allowed That is that having allowed for KF and GF penalties
664 * we have not pushed the current interframe target to low. If the
665 * adjustment we apply here is not capable of recovering all the extra
666 * bits we have spent in the KF or GF then the remainder will have to
667 * be recovered over a longer time span via other buffer / rate control
670 if (cpi->this_frame_target < min_frame_target) {
671 cpi->this_frame_target = min_frame_target;
674 if (!cpi->common.refresh_alt_ref_frame) {
675 /* Note the baseline target data rate for this inter frame. */
676 cpi->inter_frame_target = cpi->this_frame_target;
679 /* One Pass specific code */
680 if (cpi->pass == 0) {
681 /* Adapt target frame size with respect to any buffering constraints: */
682 if (cpi->buffered_mode) {
683 int one_percent_bits = (int)(1 + cpi->oxcf.optimal_buffer_level / 100);
685 if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) ||
686 (cpi->bits_off_target < cpi->oxcf.optimal_buffer_level)) {
689 /* Decide whether or not we need to adjust the frame data
692 * If we are are below the optimal buffer fullness level
693 * and adherence to buffering constraints is important to
694 * the end usage then adjust the per frame target.
696 if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
697 (cpi->buffer_level < cpi->oxcf.optimal_buffer_level)) {
699 (int)((cpi->oxcf.optimal_buffer_level - cpi->buffer_level) /
702 /* Are we overshooting the long term clip data rate... */
703 else if (cpi->bits_off_target < 0) {
704 /* Adjust per frame data target downwards to compensate. */
706 (int)(100 * -cpi->bits_off_target / (cpi->total_byte_count * 8));
709 if (percent_low > cpi->oxcf.under_shoot_pct) {
710 percent_low = cpi->oxcf.under_shoot_pct;
711 } else if (percent_low < 0) {
715 /* lower the target bandwidth for this frame. */
716 cpi->this_frame_target -= (cpi->this_frame_target * percent_low) / 200;
718 /* Are we using allowing control of active_worst_allowed_q
719 * according to buffer level.
721 if (cpi->auto_worst_q && cpi->ni_frames > 150) {
722 int64_t critical_buffer_level;
724 /* For streaming applications the most important factor is
725 * cpi->buffer_level as this takes into account the
726 * specified short term buffering constraints. However,
727 * hitting the long term clip data rate target is also
730 if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
731 /* Take the smaller of cpi->buffer_level and
732 * cpi->bits_off_target
734 critical_buffer_level = (cpi->buffer_level < cpi->bits_off_target)
736 : cpi->bits_off_target;
738 /* For local file playback short term buffering constraints
739 * are less of an issue
742 /* Consider only how we are doing for the clip as a
745 critical_buffer_level = cpi->bits_off_target;
748 /* Set the active worst quality based upon the selected
749 * buffer fullness number.
751 if (critical_buffer_level < cpi->oxcf.optimal_buffer_level) {
752 if (critical_buffer_level > (cpi->oxcf.optimal_buffer_level >> 2)) {
753 int64_t qadjustment_range = cpi->worst_quality - cpi->ni_av_qi;
754 int64_t above_base = (critical_buffer_level -
755 (cpi->oxcf.optimal_buffer_level >> 2));
757 /* Step active worst quality down from
758 * cpi->ni_av_qi when (critical_buffer_level ==
759 * cpi->optimal_buffer_level) to
760 * cpi->worst_quality when
761 * (critical_buffer_level ==
762 * cpi->optimal_buffer_level >> 2)
764 cpi->active_worst_quality =
766 (int)((qadjustment_range * above_base) /
767 (cpi->oxcf.optimal_buffer_level * 3 >> 2));
769 cpi->active_worst_quality = cpi->worst_quality;
772 cpi->active_worst_quality = cpi->ni_av_qi;
775 cpi->active_worst_quality = cpi->worst_quality;
778 int percent_high = 0;
780 if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
781 (cpi->buffer_level > cpi->oxcf.optimal_buffer_level)) {
783 (int)((cpi->buffer_level - cpi->oxcf.optimal_buffer_level) /
785 } else if (cpi->bits_off_target > cpi->oxcf.optimal_buffer_level) {
787 (int)((100 * cpi->bits_off_target) / (cpi->total_byte_count * 8));
790 if (percent_high > cpi->oxcf.over_shoot_pct) {
791 percent_high = cpi->oxcf.over_shoot_pct;
792 } else if (percent_high < 0) {
796 cpi->this_frame_target += (cpi->this_frame_target * percent_high) / 200;
798 /* Are we allowing control of active_worst_allowed_q according
801 if (cpi->auto_worst_q && cpi->ni_frames > 150) {
802 /* When using the relaxed buffer model stick to the
803 * user specified value
805 cpi->active_worst_quality = cpi->ni_av_qi;
807 cpi->active_worst_quality = cpi->worst_quality;
811 /* Set active_best_quality to prevent quality rising too high */
812 cpi->active_best_quality = cpi->best_quality;
814 /* Worst quality obviously must not be better than best quality */
815 if (cpi->active_worst_quality <= cpi->active_best_quality) {
816 cpi->active_worst_quality = cpi->active_best_quality + 1;
819 if (cpi->active_worst_quality > 127) cpi->active_worst_quality = 127;
821 /* Unbuffered mode (eg. video conferencing) */
823 /* Set the active worst quality */
824 cpi->active_worst_quality = cpi->worst_quality;
827 /* Special trap for constrained quality mode
828 * "active_worst_quality" may never drop below cq level
829 * for any frame type.
831 if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY &&
832 cpi->active_worst_quality < cpi->cq_target_quality) {
833 cpi->active_worst_quality = cpi->cq_target_quality;
837 /* Test to see if we have to drop a frame
838 * The auto-drop frame code is only used in buffered mode.
839 * In unbufferd mode (eg vide conferencing) the descision to
840 * code or drop a frame is made outside the codec in response to real
841 * world comms or buffer considerations.
843 if (cpi->drop_frames_allowed &&
844 (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
845 ((cpi->common.frame_type != KEY_FRAME))) {
846 /* Check for a buffer underun-crisis in which case we have to drop
849 if ((cpi->buffer_level < 0)) {
851 FILE *f = fopen("dec.stt", "a");
852 fprintf(f, "%10d %10d %10d %10d ***** BUFFER EMPTY\n",
853 (int) cpi->common.current_video_frame,
854 cpi->decimation_factor, cpi->common.horiz_scale,
855 (cpi->buffer_level * 100) / cpi->oxcf.optimal_buffer_level);
860 /* Update the buffer level variable. */
861 cpi->bits_off_target += cpi->av_per_frame_bandwidth;
862 if (cpi->bits_off_target > cpi->oxcf.maximum_buffer_size) {
863 cpi->bits_off_target = (int)cpi->oxcf.maximum_buffer_size;
865 cpi->buffer_level = cpi->bits_off_target;
867 if (cpi->oxcf.number_of_layers > 1) {
870 // Propagate bits saved by dropping the frame to higher layers.
871 for (i = cpi->current_layer + 1; i < cpi->oxcf.number_of_layers; ++i) {
872 LAYER_CONTEXT *lc = &cpi->layer_context[i];
873 lc->bits_off_target += (int)(lc->target_bandwidth / lc->framerate);
874 if (lc->bits_off_target > lc->maximum_buffer_size) {
875 lc->bits_off_target = lc->maximum_buffer_size;
877 lc->buffer_level = lc->bits_off_target;
883 /* Adjust target frame size for Golden Frames: */
884 if (cpi->oxcf.error_resilient_mode == 0 &&
885 (cpi->frames_till_gf_update_due == 0) && !cpi->drop_frame) {
886 if (!cpi->gf_update_onepass_cbr) {
887 int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME]
890 int gf_frame_useage = 0; /* Golden frame useage since last GF */
891 int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
892 cpi->recent_ref_frame_usage[LAST_FRAME] +
893 cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
894 cpi->recent_ref_frame_usage[ALTREF_FRAME];
896 int pct_gf_active = (100 * cpi->gf_active_count) /
897 (cpi->common.mb_rows * cpi->common.mb_cols);
900 gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
901 cpi->recent_ref_frame_usage[ALTREF_FRAME]) *
905 if (pct_gf_active > gf_frame_useage) gf_frame_useage = pct_gf_active;
907 /* Is a fixed manual GF frequency being used */
908 if (cpi->auto_gold) {
909 /* For one pass throw a GF if recent frame intra useage is
910 * low or the GF useage is high
912 if ((cpi->pass == 0) &&
913 (cpi->this_frame_percent_intra < 15 || gf_frame_useage >= 5)) {
914 cpi->common.refresh_golden_frame = 1;
916 /* Two pass GF descision */
917 } else if (cpi->pass == 2) {
918 cpi->common.refresh_golden_frame = 1;
928 f = fopen("gf_useaget.stt", "a");
929 fprintf(f, " %8ld %10ld %10ld %10ld %10ld\n",
930 cpi->common.current_video_frame, cpi->gfu_boost,
931 GFQ_ADJUSTMENT, cpi->gfu_boost, gf_frame_useage);
937 if (cpi->common.refresh_golden_frame == 1) {
943 f = fopen("GFexit.stt", "a");
944 fprintf(f, "%8ld GF coded\n", cpi->common.current_video_frame);
950 if (cpi->auto_adjust_gold_quantizer) {
954 /* If we are using alternate ref instead of gf then do not apply the
955 * boost It will instead be applied to the altref update Jims
958 if (!cpi->source_alt_ref_active) {
959 if (cpi->oxcf.fixed_q < 0) {
960 if (cpi->pass == 2) {
961 /* The spend on the GF is defined in the two pass
962 * code for two pass encodes
964 cpi->this_frame_target = cpi->per_frame_bandwidth;
966 int Boost = cpi->last_boost;
967 int frames_in_section = cpi->frames_till_gf_update_due + 1;
968 int allocation_chunks = (frames_in_section * 100) + (Boost - 100);
969 int bits_in_section = cpi->inter_frame_target * frames_in_section;
971 /* Normalize Altboost and allocations chunck down to
974 while (Boost > 1000) {
976 allocation_chunks /= 2;
979 /* Avoid loss of precision but avoid overflow */
980 if ((bits_in_section >> 7) > allocation_chunks) {
981 cpi->this_frame_target =
982 Boost * (bits_in_section / allocation_chunks);
984 cpi->this_frame_target =
985 (Boost * bits_in_section) / allocation_chunks;
989 cpi->this_frame_target =
990 (estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0) *
995 /* If there is an active ARF at this location use the minimum
996 * bits on this frame even if it is a contructed arf.
997 * The active maximum quantizer insures that an appropriate
998 * number of bits will be spent if needed for contstructed ARFs.
1000 cpi->this_frame_target = 0;
1003 cpi->current_gf_interval = cpi->frames_till_gf_update_due;
1006 // Special case for 1 pass CBR: fixed gf period.
1007 // TODO(marpan): Adjust this boost/interval logic.
1008 // If gf_cbr_boost_pct is small (below threshold) set the flag
1009 // gf_noboost_onepass_cbr = 1, which forces the gf to use the same
1010 // rate correction factor as last.
1011 cpi->gf_noboost_onepass_cbr = (cpi->oxcf.gf_cbr_boost_pct <= 100);
1012 cpi->baseline_gf_interval = cpi->gf_interval_onepass_cbr;
1013 // Skip this update if the zero_mvcount is low.
1014 if (cpi->zeromv_count > (cpi->common.MBs >> 1)) {
1015 cpi->common.refresh_golden_frame = 1;
1016 cpi->this_frame_target =
1017 (cpi->this_frame_target * (100 + cpi->oxcf.gf_cbr_boost_pct)) / 100;
1019 cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
1020 cpi->current_gf_interval = cpi->frames_till_gf_update_due;
1024 cpi->per_frame_bandwidth = old_per_frame_bandwidth;
1027 void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var) {
1028 int Q = cpi->common.base_qindex;
1029 int correction_factor = 100;
1030 double rate_correction_factor;
1031 double adjustment_limit;
1033 int projected_size_based_on_q = 0;
1035 /* Clear down mmx registers to allow floating point in what follows */
1036 vpx_clear_system_state();
1038 if (cpi->common.frame_type == KEY_FRAME) {
1039 rate_correction_factor = cpi->key_frame_rate_correction_factor;
1041 if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr &&
1042 (cpi->common.refresh_alt_ref_frame ||
1043 cpi->common.refresh_golden_frame)) {
1044 rate_correction_factor = cpi->gf_rate_correction_factor;
1046 rate_correction_factor = cpi->rate_correction_factor;
1050 /* Work out how big we would have expected the frame to be at this Q
1051 * given the current correction factor. Stay in double to avoid int
1052 * overflow when values are large
1054 projected_size_based_on_q =
1055 (int)(((.5 + rate_correction_factor *
1056 vp8_bits_per_mb[cpi->common.frame_type][Q]) *
1058 (1 << BPER_MB_NORMBITS));
1060 /* Make some allowance for cpi->zbin_over_quant */
1061 if (cpi->mb.zbin_over_quant > 0) {
1062 int Z = cpi->mb.zbin_over_quant;
1063 double Factor = 0.99;
1064 double factor_adjustment = 0.01 / 256.0;
1068 projected_size_based_on_q = (int)(Factor * projected_size_based_on_q);
1069 Factor += factor_adjustment;
1071 if (Factor >= 0.999) Factor = 0.999;
1075 /* Work out a size correction factor. */
1076 if (projected_size_based_on_q > 0) {
1078 (100 * cpi->projected_frame_size) / projected_size_based_on_q;
1081 /* More heavily damped adjustment used if we have been oscillating
1082 * either side of target
1085 case 0: adjustment_limit = 0.75; break;
1086 case 1: adjustment_limit = 0.375; break;
1088 default: adjustment_limit = 0.25; break;
1091 if (correction_factor > 102) {
1092 /* We are not already at the worst allowable quality */
1094 (int)(100.5 + ((correction_factor - 100) * adjustment_limit));
1095 rate_correction_factor =
1096 ((rate_correction_factor * correction_factor) / 100);
1098 /* Keep rate_correction_factor within limits */
1099 if (rate_correction_factor > MAX_BPB_FACTOR) {
1100 rate_correction_factor = MAX_BPB_FACTOR;
1102 } else if (correction_factor < 99) {
1103 /* We are not already at the best allowable quality */
1105 (int)(100.5 - ((100 - correction_factor) * adjustment_limit));
1106 rate_correction_factor =
1107 ((rate_correction_factor * correction_factor) / 100);
1109 /* Keep rate_correction_factor within limits */
1110 if (rate_correction_factor < MIN_BPB_FACTOR) {
1111 rate_correction_factor = MIN_BPB_FACTOR;
1115 if (cpi->common.frame_type == KEY_FRAME) {
1116 cpi->key_frame_rate_correction_factor = rate_correction_factor;
1118 if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr &&
1119 (cpi->common.refresh_alt_ref_frame ||
1120 cpi->common.refresh_golden_frame)) {
1121 cpi->gf_rate_correction_factor = rate_correction_factor;
1123 cpi->rate_correction_factor = rate_correction_factor;
1128 int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame) {
1129 int Q = cpi->active_worst_quality;
1131 if (cpi->force_maxqp == 1) {
1132 cpi->active_worst_quality = cpi->worst_quality;
1133 return cpi->worst_quality;
1135 /* Reset Zbin OQ value */
1136 cpi->mb.zbin_over_quant = 0;
1138 if (cpi->oxcf.fixed_q >= 0) {
1139 Q = cpi->oxcf.fixed_q;
1141 if (cpi->common.frame_type == KEY_FRAME) {
1142 Q = cpi->oxcf.key_q;
1143 } else if (cpi->oxcf.number_of_layers == 1 &&
1144 cpi->common.refresh_alt_ref_frame &&
1145 !cpi->gf_noboost_onepass_cbr) {
1146 Q = cpi->oxcf.alt_q;
1147 } else if (cpi->oxcf.number_of_layers == 1 &&
1148 cpi->common.refresh_golden_frame &&
1149 !cpi->gf_noboost_onepass_cbr) {
1150 Q = cpi->oxcf.gold_q;
1154 int last_error = INT_MAX;
1155 int target_bits_per_mb;
1156 int bits_per_mb_at_this_q;
1157 double correction_factor;
1159 /* Select the appropriate correction factor based upon type of frame. */
1160 if (cpi->common.frame_type == KEY_FRAME) {
1161 correction_factor = cpi->key_frame_rate_correction_factor;
1163 if (cpi->oxcf.number_of_layers == 1 && !cpi->gf_noboost_onepass_cbr &&
1164 (cpi->common.refresh_alt_ref_frame ||
1165 cpi->common.refresh_golden_frame)) {
1166 correction_factor = cpi->gf_rate_correction_factor;
1168 correction_factor = cpi->rate_correction_factor;
1172 /* Calculate required scaling factor based on target frame size and
1173 * size of frame produced using previous Q
1175 if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS)) {
1176 /* Case where we would overflow int */
1177 target_bits_per_mb = (target_bits_per_frame / cpi->common.MBs)
1178 << BPER_MB_NORMBITS;
1180 target_bits_per_mb =
1181 (target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs;
1184 i = cpi->active_best_quality;
1187 bits_per_mb_at_this_q =
1189 correction_factor * vp8_bits_per_mb[cpi->common.frame_type][i]);
1191 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
1192 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error) {
1200 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
1202 } while (++i <= cpi->active_worst_quality);
1204 /* If we are at MAXQ then enable Q over-run which seeks to claw
1205 * back additional bits through things like the RD multiplier
1206 * and zero bin size.
1211 double Factor = 0.99;
1212 double factor_adjustment = 0.01 / 256.0;
1214 if (cpi->common.frame_type == KEY_FRAME) {
1216 } else if (cpi->oxcf.number_of_layers == 1 &&
1217 !cpi->gf_noboost_onepass_cbr &&
1218 (cpi->common.refresh_alt_ref_frame ||
1219 (cpi->common.refresh_golden_frame &&
1220 !cpi->source_alt_ref_active))) {
1223 zbin_oqmax = ZBIN_OQ_MAX;
1228 (double)target_bits_per_mb/(double)bits_per_mb_at_this_q;
1231 Factor = Factor/1.2683;
1233 Oq = pow( Factor, (1.0/-0.165) );
1235 if ( Oq > zbin_oqmax )
1238 cpi->zbin_over_quant = (int)Oq;
1241 /* Each incrment in the zbin is assumed to have a fixed effect
1242 * on bitrate. This is not of course true. The effect will be
1243 * highly clip dependent and may well have sudden steps. The
1244 * idea here is to acheive higher effective quantizers than the
1245 * normal maximum by expanding the zero bin and hence
1246 * decreasing the number of low magnitude non zero coefficients.
1248 while (cpi->mb.zbin_over_quant < zbin_oqmax) {
1249 cpi->mb.zbin_over_quant++;
1251 if (cpi->mb.zbin_over_quant > zbin_oqmax) {
1252 cpi->mb.zbin_over_quant = zbin_oqmax;
1255 /* Adjust bits_per_mb_at_this_q estimate */
1256 bits_per_mb_at_this_q = (int)(Factor * bits_per_mb_at_this_q);
1257 Factor += factor_adjustment;
1259 if (Factor >= 0.999) Factor = 0.999;
1261 /* Break out if we get down to the target rate */
1262 if (bits_per_mb_at_this_q <= target_bits_per_mb) break;
1270 static int estimate_keyframe_frequency(VP8_COMP *cpi) {
1273 /* Average key frame frequency */
1274 int av_key_frame_frequency = 0;
1276 /* First key frame at start of sequence is a special case. We have no
1279 if (cpi->key_frame_count == 1) {
1280 /* Assume a default of 1 kf every 2 seconds, or the max kf interval,
1281 * whichever is smaller.
1283 int key_freq = cpi->oxcf.key_freq > 0 ? cpi->oxcf.key_freq : 1;
1284 av_key_frame_frequency = 1 + (int)cpi->output_framerate * 2;
1286 if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq) {
1287 av_key_frame_frequency = key_freq;
1290 cpi->prior_key_frame_distance[KEY_FRAME_CONTEXT - 1] =
1291 av_key_frame_frequency;
1293 unsigned int total_weight = 0;
1294 int last_kf_interval =
1295 (cpi->frames_since_key > 0) ? cpi->frames_since_key : 1;
1297 /* reset keyframe context and calculate weighted average of last
1298 * KEY_FRAME_CONTEXT keyframes
1300 for (i = 0; i < KEY_FRAME_CONTEXT; ++i) {
1301 if (i < KEY_FRAME_CONTEXT - 1) {
1302 cpi->prior_key_frame_distance[i] = cpi->prior_key_frame_distance[i + 1];
1304 cpi->prior_key_frame_distance[i] = last_kf_interval;
1307 av_key_frame_frequency +=
1308 prior_key_frame_weight[i] * cpi->prior_key_frame_distance[i];
1309 total_weight += prior_key_frame_weight[i];
1312 av_key_frame_frequency /= total_weight;
1314 // TODO (marpan): Given the checks above, |av_key_frame_frequency|
1315 // should always be above 0. But for now we keep the sanity check in.
1316 if (av_key_frame_frequency == 0) av_key_frame_frequency = 1;
1317 return av_key_frame_frequency;
1320 void vp8_adjust_key_frame_context(VP8_COMP *cpi) {
1321 /* Clear down mmx registers to allow floating point in what follows */
1322 vpx_clear_system_state();
1324 /* Do we have any key frame overspend to recover? */
1325 /* Two-pass overspend handled elsewhere. */
1326 if ((cpi->pass != 2) &&
1327 (cpi->projected_frame_size > cpi->per_frame_bandwidth)) {
1330 /* Update the count of key frame overspend to be recovered in
1331 * subsequent frames. A portion of the KF overspend is treated as gf
1332 * overspend (and hence recovered more quickly) as the kf is also a
1333 * gf. Otherwise the few frames following each kf tend to get more
1334 * bits allocated than those following other gfs.
1336 overspend = (cpi->projected_frame_size - cpi->per_frame_bandwidth);
1338 if (cpi->oxcf.number_of_layers > 1) {
1339 cpi->kf_overspend_bits += overspend;
1341 cpi->kf_overspend_bits += overspend * 7 / 8;
1342 cpi->gf_overspend_bits += overspend * 1 / 8;
1345 /* Work out how much to try and recover per frame. */
1346 cpi->kf_bitrate_adjustment =
1347 cpi->kf_overspend_bits / estimate_keyframe_frequency(cpi);
1350 cpi->frames_since_key = 0;
1351 cpi->key_frame_count++;
1354 void vp8_compute_frame_size_bounds(VP8_COMP *cpi, int *frame_under_shoot_limit,
1355 int *frame_over_shoot_limit) {
1356 /* Set-up bounds on acceptable frame size: */
1357 if (cpi->oxcf.fixed_q >= 0) {
1358 /* Fixed Q scenario: frame size never outranges target
1359 * (there is no target!)
1361 *frame_under_shoot_limit = 0;
1362 *frame_over_shoot_limit = INT_MAX;
1364 if (cpi->common.frame_type == KEY_FRAME) {
1365 *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
1366 *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
1368 if (cpi->oxcf.number_of_layers > 1 || cpi->common.refresh_alt_ref_frame ||
1369 cpi->common.refresh_golden_frame) {
1370 *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
1371 *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
1373 /* For CBR take buffer fullness into account */
1374 if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
1375 if (cpi->buffer_level >= ((cpi->oxcf.optimal_buffer_level +
1376 cpi->oxcf.maximum_buffer_size) >>
1378 /* Buffer is too full so relax overshoot and tighten
1381 *frame_over_shoot_limit = cpi->this_frame_target * 12 / 8;
1382 *frame_under_shoot_limit = cpi->this_frame_target * 6 / 8;
1383 } else if (cpi->buffer_level <=
1384 (cpi->oxcf.optimal_buffer_level >> 1)) {
1385 /* Buffer is too low so relax undershoot and tighten
1388 *frame_over_shoot_limit = cpi->this_frame_target * 10 / 8;
1389 *frame_under_shoot_limit = cpi->this_frame_target * 4 / 8;
1391 *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
1392 *frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
1395 /* VBR and CQ mode */
1396 /* Note that tighter restrictions here can help quality
1397 * but hurt encode speed
1400 /* Stron overshoot limit for constrained quality */
1401 if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) {
1402 *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
1403 *frame_under_shoot_limit = cpi->this_frame_target * 2 / 8;
1405 *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
1406 *frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
1412 /* For very small rate targets where the fractional adjustment
1413 * (eg * 7/8) may be tiny make sure there is at least a minimum
1416 *frame_over_shoot_limit += 200;
1417 *frame_under_shoot_limit -= 200;
1418 if (*frame_under_shoot_limit < 0) *frame_under_shoot_limit = 0;
1422 /* return of 0 means drop frame */
1423 int vp8_pick_frame_size(VP8_COMP *cpi) {
1424 VP8_COMMON *cm = &cpi->common;
1426 if (cm->frame_type == KEY_FRAME) {
1427 calc_iframe_target_size(cpi);
1429 calc_pframe_target_size(cpi);
1431 /* Check if we're dropping the frame: */
1432 if (cpi->drop_frame) {
1433 cpi->drop_frame = 0;
1439 // If this just encoded frame (mcomp/transform/quant, but before loopfilter and
1440 // pack_bitstream) has large overshoot, and was not being encoded close to the
1441 // max QP, then drop this frame and force next frame to be encoded at max QP.
1442 // Allow this for screen_content_mode = 2, or if drop frames is allowed.
1443 // TODO(marpan): Should do this exit condition during the encode_frame
1444 // (i.e., halfway during the encoding of the frame) to save cycles.
1445 int vp8_drop_encodedframe_overshoot(VP8_COMP *cpi, int Q) {
1446 int force_drop_overshoot = 0;
1447 #if CONFIG_MULTI_RES_ENCODING
1448 // Only check for dropping due to overshoot on the lowest stream.
1449 // If the lowest stream of the multi-res encoding was dropped due to
1450 // overshoot, then force dropping on all upper layer streams
1451 // (mr_encoder_id > 0).
1452 LOWER_RES_FRAME_INFO *low_res_frame_info =
1453 (LOWER_RES_FRAME_INFO *)cpi->oxcf.mr_low_res_mode_info;
1454 if (cpi->oxcf.mr_total_resolutions > 1 && cpi->oxcf.mr_encoder_id > 0) {
1455 force_drop_overshoot = low_res_frame_info->is_frame_dropped_overshoot_maxqp;
1456 if (!force_drop_overshoot) {
1457 cpi->force_maxqp = 0;
1458 cpi->frames_since_last_drop_overshoot++;
1463 if (cpi->common.frame_type != KEY_FRAME &&
1464 (cpi->oxcf.screen_content_mode == 2 ||
1465 (cpi->drop_frames_allowed &&
1466 (force_drop_overshoot ||
1467 (cpi->rate_correction_factor < (8.0f * MIN_BPB_FACTOR) &&
1468 cpi->frames_since_last_drop_overshoot > (int)cpi->framerate))))) {
1469 // Note: the "projected_frame_size" from encode_frame() only gives estimate
1470 // of mode/motion vector rate (in non-rd mode): so below we only require
1471 // that projected_frame_size is somewhat greater than per-frame-bandwidth,
1472 // but add additional condition with high threshold on prediction residual.
1474 // QP threshold: only allow dropping if we are not close to qp_max.
1475 int thresh_qp = 3 * cpi->worst_quality >> 2;
1476 // Rate threshold, in bytes.
1477 int thresh_rate = 2 * (cpi->av_per_frame_bandwidth >> 3);
1478 // Threshold for the average (over all macroblocks) of the pixel-sum
1479 // residual error over 16x16 block.
1480 int thresh_pred_err_mb = (200 << 4);
1481 int pred_err_mb = (int)(cpi->mb.prediction_error / cpi->common.MBs);
1482 // Reduce/ignore thresh_rate if pred_err_mb much larger than its threshold,
1483 // give more weight to pred_err metric for overshoot detection.
1484 if (cpi->drop_frames_allowed && pred_err_mb > (thresh_pred_err_mb << 4))
1485 thresh_rate = thresh_rate >> 3;
1486 if ((Q < thresh_qp && cpi->projected_frame_size > thresh_rate &&
1487 pred_err_mb > thresh_pred_err_mb) ||
1488 force_drop_overshoot) {
1490 double new_correction_factor;
1491 int target_bits_per_mb;
1492 const int target_size = cpi->av_per_frame_bandwidth;
1493 // Flag to indicate we will force next frame to be encoded at max QP.
1494 cpi->force_maxqp = 1;
1495 // Reset the buffer levels.
1496 cpi->buffer_level = cpi->oxcf.optimal_buffer_level;
1497 cpi->bits_off_target = cpi->oxcf.optimal_buffer_level;
1498 // Compute a new rate correction factor, corresponding to the current
1499 // target frame size and max_QP, and adjust the rate correction factor
1500 // upwards, if needed.
1501 // This is to prevent a bad state where the re-encoded frame at max_QP
1502 // undershoots significantly, and then we end up dropping every other
1503 // frame because the QP/rate_correction_factor may have been too low
1504 // before the drop and then takes too long to come up.
1505 if (target_size >= (INT_MAX >> BPER_MB_NORMBITS)) {
1506 target_bits_per_mb = (target_size / cpi->common.MBs)
1507 << BPER_MB_NORMBITS;
1509 target_bits_per_mb =
1510 (target_size << BPER_MB_NORMBITS) / cpi->common.MBs;
1512 // Rate correction factor based on target_size_per_mb and max_QP.
1513 new_correction_factor =
1514 (double)target_bits_per_mb /
1515 (double)vp8_bits_per_mb[INTER_FRAME][cpi->worst_quality];
1516 if (new_correction_factor > cpi->rate_correction_factor) {
1517 cpi->rate_correction_factor =
1518 VPXMIN(2.0 * cpi->rate_correction_factor, new_correction_factor);
1520 if (cpi->rate_correction_factor > MAX_BPB_FACTOR) {
1521 cpi->rate_correction_factor = MAX_BPB_FACTOR;
1523 // Drop this frame: update frame counters.
1524 cpi->common.current_video_frame++;
1525 cpi->frames_since_key++;
1526 cpi->temporal_pattern_counter++;
1527 cpi->frames_since_last_drop_overshoot = 0;
1528 if (cpi->oxcf.number_of_layers > 1) {
1529 // Set max_qp and rate correction for all temporal layers if overshoot
1531 for (i = 0; i < cpi->oxcf.number_of_layers; ++i) {
1532 LAYER_CONTEXT *lc = &cpi->layer_context[i];
1533 lc->force_maxqp = 1;
1534 lc->frames_since_last_drop_overshoot = 0;
1535 lc->rate_correction_factor = cpi->rate_correction_factor;
1538 #if CONFIG_MULTI_RES_ENCODING
1539 if (cpi->oxcf.mr_total_resolutions > 1)
1540 low_res_frame_info->is_frame_dropped_overshoot_maxqp = 1;
1544 cpi->force_maxqp = 0;
1545 cpi->frames_since_last_drop_overshoot++;
1546 #if CONFIG_MULTI_RES_ENCODING
1547 if (cpi->oxcf.mr_total_resolutions > 1)
1548 low_res_frame_info->is_frame_dropped_overshoot_maxqp = 0;
1552 cpi->force_maxqp = 0;
1553 cpi->frames_since_last_drop_overshoot++;
1554 #if CONFIG_MULTI_RES_ENCODING
1555 if (cpi->oxcf.mr_total_resolutions > 1)
1556 low_res_frame_info->is_frame_dropped_overshoot_maxqp = 0;