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 "vpx_mem/vpx_mem.h"
20 #include "vp9/common/vp9_alloccommon.h"
21 #include "vp9/common/vp9_common.h"
22 #include "vp9/common/vp9_entropymode.h"
23 #include "vp9/common/vp9_quant_common.h"
24 #include "vp9/common/vp9_seg_common.h"
25 #include "vp9/common/vp9_systemdependent.h"
27 #include "vp9/encoder/vp9_encodemv.h"
28 #include "vp9/encoder/vp9_ratectrl.h"
30 #define DEFAULT_KF_BOOST 2000
31 #define DEFAULT_GF_BOOST 2000
33 #define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
35 #define MIN_BPB_FACTOR 0.005
36 #define MAX_BPB_FACTOR 50
38 // Tables relating active max Q to active min Q
39 static int kf_low_motion_minq[QINDEX_RANGE];
40 static int kf_high_motion_minq[QINDEX_RANGE];
41 static int gf_low_motion_minq[QINDEX_RANGE];
42 static int gf_high_motion_minq[QINDEX_RANGE];
43 static int inter_minq[QINDEX_RANGE];
44 static int afq_low_motion_minq[QINDEX_RANGE];
45 static int afq_high_motion_minq[QINDEX_RANGE];
46 static int gf_high = 2000;
47 static int gf_low = 400;
48 static int kf_high = 5000;
49 static int kf_low = 400;
51 // Functions to compute the active minq lookup table entries based on a
52 // formulaic approach to facilitate easier adjustment of the Q tables.
53 // The formulae were derived from computing a 3rd order polynomial best
54 // fit to the original data (after plotting real maxq vs minq (not q index))
55 static int get_minq_index(double maxq, double x3, double x2, double x1) {
57 const double minqtarget = MIN(((x3 * maxq + x2) * maxq + x1) * maxq,
60 // Special case handling to deal with the step from q2.0
61 // down to lossless mode represented by q 1.0.
62 if (minqtarget <= 2.0)
65 for (i = 0; i < QINDEX_RANGE; i++)
66 if (minqtarget <= vp9_convert_qindex_to_q(i))
69 return QINDEX_RANGE - 1;
72 void vp9_rc_init_minq_luts() {
75 for (i = 0; i < QINDEX_RANGE; i++) {
76 const double maxq = vp9_convert_qindex_to_q(i);
77 kf_low_motion_minq[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.15);
78 kf_high_motion_minq[i] = get_minq_index(maxq, 0.000002, -0.0012, 0.50);
79 gf_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.32);
80 gf_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.50);
81 afq_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.33);
82 afq_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55);
83 inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.55);
87 // These functions use formulaic calculations to make playing with the
88 // quantizer tables easier. If necessary they can be replaced by lookup
89 // tables if and when things settle down in the experimental bitstream
90 double vp9_convert_qindex_to_q(int qindex) {
91 // Convert the index to a real Q value (scaled down to match old Q values)
92 return vp9_ac_quant(qindex, 0) / 4.0;
95 int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
96 double correction_factor) {
97 const double q = vp9_convert_qindex_to_q(qindex);
98 int enumerator = frame_type == KEY_FRAME ? 3300000 : 2250000;
100 // q based adjustment to baseline enumerator
101 enumerator += (int)(enumerator * q) >> 12;
102 return (int)(0.5 + (enumerator * correction_factor / q));
105 static int estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
106 double correction_factor) {
107 const int bpm = (int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor));
108 return ((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS;
111 int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
112 const RATE_CONTROL *rc = &cpi->rc;
113 const int min_frame_target = MAX(rc->min_frame_bandwidth,
114 rc->av_per_frame_bandwidth >> 5);
115 if (target < min_frame_target)
116 target = min_frame_target;
117 if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
118 // If there is an active ARF at this location use the minimum
119 // bits on this frame even if it is a constructed arf.
120 // The active maximum quantizer insures that an appropriate
121 // number of bits will be spent if needed for constructed ARFs.
122 target = min_frame_target;
124 // Clip the frame target to the maximum allowed value.
125 if (target > rc->max_frame_bandwidth)
126 target = rc->max_frame_bandwidth;
130 int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
131 const RATE_CONTROL *rc = &cpi->rc;
132 const VP9_CONFIG *oxcf = &cpi->oxcf;
133 if (oxcf->rc_max_intra_bitrate_pct) {
134 const int max_rate = rc->av_per_frame_bandwidth *
135 oxcf->rc_max_intra_bitrate_pct / 100;
136 target = MIN(target, max_rate);
138 if (target > rc->max_frame_bandwidth)
139 target = rc->max_frame_bandwidth;
144 // Update the buffer level for higher layers, given the encoded current layer.
145 static void update_layer_buffer_level(SVC *svc, int encoded_frame_size) {
146 int temporal_layer = 0;
147 int current_temporal_layer = svc->temporal_layer_id;
148 for (temporal_layer = current_temporal_layer + 1;
149 temporal_layer < svc->number_temporal_layers; ++temporal_layer) {
150 LAYER_CONTEXT *lc = &svc->layer_context[temporal_layer];
151 RATE_CONTROL *lrc = &lc->rc;
152 int bits_off_for_this_layer = (int)(lc->target_bandwidth / lc->framerate -
154 lrc->bits_off_target += bits_off_for_this_layer;
156 // Clip buffer level to maximum buffer size for the layer.
157 lrc->bits_off_target = MIN(lrc->bits_off_target, lc->maximum_buffer_size);
158 lrc->buffer_level = lrc->bits_off_target;
162 // Update the buffer level: leaky bucket model.
163 static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
164 const VP9_COMMON *const cm = &cpi->common;
165 const VP9_CONFIG *oxcf = &cpi->oxcf;
166 RATE_CONTROL *const rc = &cpi->rc;
168 // Non-viewable frames are a special case and are treated as pure overhead.
169 if (!cm->show_frame) {
170 rc->bits_off_target -= encoded_frame_size;
172 rc->bits_off_target += rc->av_per_frame_bandwidth - encoded_frame_size;
175 // Clip the buffer level to the maximum specified buffer size.
176 rc->bits_off_target = MIN(rc->bits_off_target, oxcf->maximum_buffer_size);
177 rc->buffer_level = rc->bits_off_target;
179 if (cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
180 update_layer_buffer_level(&cpi->svc, encoded_frame_size);
184 void vp9_rc_init(const VP9_CONFIG *oxcf, int pass, RATE_CONTROL *rc) {
185 if (pass == 0 && oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
186 rc->avg_frame_qindex[0] = oxcf->worst_allowed_q;
187 rc->avg_frame_qindex[1] = oxcf->worst_allowed_q;
188 rc->avg_frame_qindex[2] = oxcf->worst_allowed_q;
190 rc->avg_frame_qindex[0] = (oxcf->worst_allowed_q +
191 oxcf->best_allowed_q) / 2;
192 rc->avg_frame_qindex[1] = (oxcf->worst_allowed_q +
193 oxcf->best_allowed_q) / 2;
194 rc->avg_frame_qindex[2] = (oxcf->worst_allowed_q +
195 oxcf->best_allowed_q) / 2;
198 rc->last_q[0] = oxcf->best_allowed_q;
199 rc->last_q[1] = oxcf->best_allowed_q;
200 rc->last_q[2] = oxcf->best_allowed_q;
202 rc->buffer_level = oxcf->starting_buffer_level;
203 rc->bits_off_target = oxcf->starting_buffer_level;
205 rc->rolling_target_bits = rc->av_per_frame_bandwidth;
206 rc->rolling_actual_bits = rc->av_per_frame_bandwidth;
207 rc->long_rolling_target_bits = rc->av_per_frame_bandwidth;
208 rc->long_rolling_actual_bits = rc->av_per_frame_bandwidth;
210 rc->total_actual_bits = 0;
211 rc->total_target_vs_actual = 0;
213 rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
214 rc->frames_since_key = 8; // Sensible default for first frame.
215 rc->this_key_frame_forced = 0;
216 rc->next_key_frame_forced = 0;
217 rc->source_alt_ref_pending = 0;
218 rc->source_alt_ref_active = 0;
220 rc->frames_till_gf_update_due = 0;
222 rc->ni_av_qi = oxcf->worst_allowed_q;
227 rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q);
229 rc->rate_correction_factor = 1.0;
230 rc->key_frame_rate_correction_factor = 1.0;
231 rc->gf_rate_correction_factor = 1.0;
234 int vp9_rc_drop_frame(VP9_COMP *cpi) {
235 const VP9_CONFIG *oxcf = &cpi->oxcf;
236 RATE_CONTROL *const rc = &cpi->rc;
238 if (!oxcf->drop_frames_water_mark) {
241 if (rc->buffer_level < 0) {
242 // Always drop if buffer is below 0.
245 // If buffer is below drop_mark, for now just drop every other frame
246 // (starting with the next frame) until it increases back over drop_mark.
247 int drop_mark = (int)(oxcf->drop_frames_water_mark *
248 oxcf->optimal_buffer_level / 100);
249 if ((rc->buffer_level > drop_mark) &&
250 (rc->decimation_factor > 0)) {
251 --rc->decimation_factor;
252 } else if (rc->buffer_level <= drop_mark &&
253 rc->decimation_factor == 0) {
254 rc->decimation_factor = 1;
256 if (rc->decimation_factor > 0) {
257 if (rc->decimation_count > 0) {
258 --rc->decimation_count;
261 rc->decimation_count = rc->decimation_factor;
265 rc->decimation_count = 0;
272 static double get_rate_correction_factor(const VP9_COMP *cpi) {
273 if (cpi->common.frame_type == KEY_FRAME) {
274 return cpi->rc.key_frame_rate_correction_factor;
276 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
277 !cpi->rc.is_src_frame_alt_ref &&
278 !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
279 return cpi->rc.gf_rate_correction_factor;
281 return cpi->rc.rate_correction_factor;
285 static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
286 if (cpi->common.frame_type == KEY_FRAME) {
287 cpi->rc.key_frame_rate_correction_factor = factor;
289 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
290 !cpi->rc.is_src_frame_alt_ref &&
291 !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
292 cpi->rc.gf_rate_correction_factor = factor;
294 cpi->rc.rate_correction_factor = factor;
298 void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
299 const VP9_COMMON *const cm = &cpi->common;
300 int correction_factor = 100;
301 double rate_correction_factor = get_rate_correction_factor(cpi);
302 double adjustment_limit;
304 int projected_size_based_on_q = 0;
306 // Clear down mmx registers to allow floating point in what follows
307 vp9_clear_system_state();
309 // Work out how big we would have expected the frame to be at this Q given
310 // the current correction factor.
311 // Stay in double to avoid int overflow when values are large
312 projected_size_based_on_q = estimate_bits_at_q(cm->frame_type,
313 cm->base_qindex, cm->MBs,
314 rate_correction_factor);
315 // Work out a size correction factor.
316 if (projected_size_based_on_q > 0)
317 correction_factor = (100 * cpi->rc.projected_frame_size) /
318 projected_size_based_on_q;
320 // More heavily damped adjustment used if we have been oscillating either side
324 adjustment_limit = 0.75;
327 adjustment_limit = 0.375;
331 adjustment_limit = 0.25;
335 if (correction_factor > 102) {
336 // We are not already at the worst allowable quality
337 correction_factor = (int)(100 + ((correction_factor - 100) *
339 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
341 // Keep rate_correction_factor within limits
342 if (rate_correction_factor > MAX_BPB_FACTOR)
343 rate_correction_factor = MAX_BPB_FACTOR;
344 } else if (correction_factor < 99) {
345 // We are not already at the best allowable quality
346 correction_factor = (int)(100 - ((100 - correction_factor) *
348 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
350 // Keep rate_correction_factor within limits
351 if (rate_correction_factor < MIN_BPB_FACTOR)
352 rate_correction_factor = MIN_BPB_FACTOR;
355 set_rate_correction_factor(cpi, rate_correction_factor);
359 int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
360 int active_best_quality, int active_worst_quality) {
361 const VP9_COMMON *const cm = &cpi->common;
362 int q = active_worst_quality;
363 int last_error = INT_MAX;
364 int i, target_bits_per_mb;
365 const double correction_factor = get_rate_correction_factor(cpi);
367 // Calculate required scaling factor based on target frame size and size of
368 // frame produced using previous Q.
370 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
372 i = active_best_quality;
375 const int bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cm->frame_type, i,
378 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
379 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
386 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
388 } while (++i <= active_worst_quality);
393 static int get_active_quality(int q, int gfu_boost, int low, int high,
394 int *low_motion_minq, int *high_motion_minq) {
395 if (gfu_boost > high) {
396 return low_motion_minq[q];
397 } else if (gfu_boost < low) {
398 return high_motion_minq[q];
400 const int gap = high - low;
401 const int offset = high - gfu_boost;
402 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
403 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
404 return low_motion_minq[q] + adjustment;
408 static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
409 const RATE_CONTROL *const rc = &cpi->rc;
410 const unsigned int curr_frame = cpi->common.current_video_frame;
411 int active_worst_quality;
413 if (cpi->common.frame_type == KEY_FRAME) {
414 active_worst_quality = curr_frame == 0 ? rc->worst_quality
415 : rc->last_q[KEY_FRAME] * 2;
417 if (!rc->is_src_frame_alt_ref &&
418 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
419 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
420 : rc->last_q[INTER_FRAME];
422 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
423 : rc->last_q[INTER_FRAME] * 2;
427 return MIN(active_worst_quality, rc->worst_quality);
430 // Adjust active_worst_quality level based on buffer level.
431 static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) {
432 // Adjust active_worst_quality: If buffer is above the optimal/target level,
433 // bring active_worst_quality down depending on fullness of buffer.
434 // If buffer is below the optimal level, let the active_worst_quality go from
435 // ambient Q (at buffer = optimal level) to worst_quality level
436 // (at buffer = critical level).
437 const VP9_COMMON *const cm = &cpi->common;
438 const VP9_CONFIG *oxcf = &cpi->oxcf;
439 const RATE_CONTROL *rc = &cpi->rc;
440 // Buffer level below which we push active_worst to worst_quality.
441 int64_t critical_level = oxcf->optimal_buffer_level >> 2;
442 int64_t buff_lvl_step = 0;
444 int active_worst_quality;
445 if (cm->frame_type == KEY_FRAME)
446 return rc->worst_quality;
447 if (cm->current_video_frame > 1)
448 active_worst_quality = MIN(rc->worst_quality,
449 rc->avg_frame_qindex[INTER_FRAME] * 5 / 4);
451 active_worst_quality = MIN(rc->worst_quality,
452 rc->avg_frame_qindex[KEY_FRAME] * 3 / 2);
453 if (rc->buffer_level > oxcf->optimal_buffer_level) {
455 // Maximum limit for down adjustment, ~30%.
456 int max_adjustment_down = active_worst_quality / 3;
457 if (max_adjustment_down) {
458 buff_lvl_step = ((oxcf->maximum_buffer_size -
459 oxcf->optimal_buffer_level) / max_adjustment_down);
461 adjustment = (int)((rc->buffer_level - oxcf->optimal_buffer_level) /
463 active_worst_quality -= adjustment;
465 } else if (rc->buffer_level > critical_level) {
466 // Adjust up from ambient Q.
467 if (critical_level) {
468 buff_lvl_step = (oxcf->optimal_buffer_level - critical_level);
471 (int)((rc->worst_quality - rc->avg_frame_qindex[INTER_FRAME]) *
472 (oxcf->optimal_buffer_level - rc->buffer_level) /
475 active_worst_quality = rc->avg_frame_qindex[INTER_FRAME] + adjustment;
478 // Set to worst_quality if buffer is below critical level.
479 active_worst_quality = rc->worst_quality;
481 return active_worst_quality;
484 static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi,
487 const VP9_COMMON *const cm = &cpi->common;
488 const RATE_CONTROL *const rc = &cpi->rc;
489 int active_best_quality;
490 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
493 if (frame_is_intra_only(cm)) {
494 active_best_quality = rc->best_quality;
495 // Handle the special case for key frames forced when we have75 reached
496 // the maximum key frame interval. Here force the Q to a range
497 // based on the ambient Q to reduce the risk of popping.
498 if (rc->this_key_frame_forced) {
499 int qindex = rc->last_boosted_qindex;
500 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
501 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
502 (last_boosted_q * 0.75));
503 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
504 } else if (cm->current_video_frame > 0) {
505 // not first frame of one pass and kf_boost is set
506 double q_adj_factor = 1.0;
509 active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
513 kf_high_motion_minq);
515 // Allow somewhat lower kf minq with small image formats.
516 if ((cm->width * cm->height) <= (352 * 288)) {
517 q_adj_factor -= 0.25;
520 // Convert the adjustment factor to a qindex delta
521 // on active_best_quality.
522 q_val = vp9_convert_qindex_to_q(active_best_quality);
523 active_best_quality += vp9_compute_qdelta(rc, q_val,
524 q_val * q_adj_factor);
526 } else if (!rc->is_src_frame_alt_ref &&
528 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
529 // Use the lower of active_worst_quality and recent
530 // average Q as basis for GF/ARF best Q limit unless last frame was
532 if (rc->frames_since_key > 1 &&
533 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
534 q = rc->avg_frame_qindex[INTER_FRAME];
536 q = active_worst_quality;
538 active_best_quality = get_active_quality(
539 q, rc->gfu_boost, gf_low, gf_high,
540 gf_low_motion_minq, gf_high_motion_minq);
542 // Use the lower of active_worst_quality and recent/average Q.
543 if (cm->current_video_frame > 1) {
544 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
545 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
547 active_best_quality = inter_minq[active_worst_quality];
549 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
550 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
552 active_best_quality = inter_minq[active_worst_quality];
556 // Clip the active best and worst quality values to limits
557 active_best_quality = clamp(active_best_quality,
558 rc->best_quality, rc->worst_quality);
559 active_worst_quality = clamp(active_worst_quality,
560 active_best_quality, rc->worst_quality);
562 *top_index = active_worst_quality;
563 *bottom_index = active_best_quality;
565 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
566 // Limit Q range for the adaptive loop.
567 if (cm->frame_type == KEY_FRAME &&
568 !rc->this_key_frame_forced &&
569 !(cm->current_video_frame == 0)) {
571 vp9_clear_system_state();
572 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
573 active_worst_quality, 2.0);
574 *top_index = active_worst_quality + qdelta;
575 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
579 // Special case code to try and match quality with forced key frames
580 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
581 q = rc->last_boosted_qindex;
583 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
584 active_best_quality, active_worst_quality);
585 if (q > *top_index) {
586 // Special case when we are targeting the max allowed rate
587 if (rc->this_frame_target >= rc->max_frame_bandwidth)
593 assert(*top_index <= rc->worst_quality &&
594 *top_index >= rc->best_quality);
595 assert(*bottom_index <= rc->worst_quality &&
596 *bottom_index >= rc->best_quality);
597 assert(q <= rc->worst_quality && q >= rc->best_quality);
601 static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
604 const VP9_COMMON *const cm = &cpi->common;
605 const RATE_CONTROL *const rc = &cpi->rc;
606 const VP9_CONFIG *const oxcf = &cpi->oxcf;
607 int active_best_quality;
608 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
611 if (frame_is_intra_only(cm)) {
612 active_best_quality = rc->best_quality;
613 #if !CONFIG_MULTIPLE_ARF
614 // Handle the special case for key frames forced when we have75 reached
615 // the maximum key frame interval. Here force the Q to a range
616 // based on the ambient Q to reduce the risk of popping.
617 if (rc->this_key_frame_forced) {
618 int qindex = rc->last_boosted_qindex;
619 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
620 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
621 last_boosted_q * 0.75);
622 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
623 } else if (cm->current_video_frame > 0) {
624 // not first frame of one pass and kf_boost is set
625 double q_adj_factor = 1.0;
628 active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
632 kf_high_motion_minq);
634 // Allow somewhat lower kf minq with small image formats.
635 if ((cm->width * cm->height) <= (352 * 288)) {
636 q_adj_factor -= 0.25;
639 // Convert the adjustment factor to a qindex delta
640 // on active_best_quality.
641 q_val = vp9_convert_qindex_to_q(active_best_quality);
642 active_best_quality += vp9_compute_qdelta(rc, q_val,
643 q_val * q_adj_factor);
647 // Force the KF quantizer to be 30% of the active_worst_quality.
648 current_q = vp9_convert_qindex_to_q(active_worst_quality);
649 active_best_quality = active_worst_quality
650 + vp9_compute_qdelta(rc, current_q, current_q * 0.3);
652 } else if (!rc->is_src_frame_alt_ref &&
653 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
654 // Use the lower of active_worst_quality and recent
655 // average Q as basis for GF/ARF best Q limit unless last frame was
657 if (rc->frames_since_key > 1 &&
658 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
659 q = rc->avg_frame_qindex[INTER_FRAME];
661 q = rc->avg_frame_qindex[KEY_FRAME];
663 // For constrained quality dont allow Q less than the cq level
664 if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
665 if (q < cpi->cq_target_quality)
666 q = cpi->cq_target_quality;
667 if (rc->frames_since_key > 1) {
668 active_best_quality = get_active_quality(q, rc->gfu_boost,
671 afq_high_motion_minq);
673 active_best_quality = get_active_quality(q, rc->gfu_boost,
676 gf_high_motion_minq);
678 // Constrained quality use slightly lower active best.
679 active_best_quality = active_best_quality * 15 / 16;
681 } else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
682 if (!cpi->refresh_alt_ref_frame) {
683 active_best_quality = cpi->cq_target_quality;
685 if (rc->frames_since_key > 1) {
686 active_best_quality = get_active_quality(
687 q, rc->gfu_boost, gf_low, gf_high,
688 afq_low_motion_minq, afq_high_motion_minq);
690 active_best_quality = get_active_quality(
691 q, rc->gfu_boost, gf_low, gf_high,
692 gf_low_motion_minq, gf_high_motion_minq);
696 active_best_quality = get_active_quality(
697 q, rc->gfu_boost, gf_low, gf_high,
698 gf_low_motion_minq, gf_high_motion_minq);
701 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
702 active_best_quality = cpi->cq_target_quality;
704 // Use the lower of active_worst_quality and recent/average Q.
705 if (cm->current_video_frame > 1)
706 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
708 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
709 // For the constrained quality mode we don't want
710 // q to fall below the cq level.
711 if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
712 (active_best_quality < cpi->cq_target_quality)) {
713 // If we are strongly undershooting the target rate in the last
714 // frames then use the user passed in cq value not the auto
716 if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
717 active_best_quality = oxcf->cq_level;
719 active_best_quality = cpi->cq_target_quality;
724 // Clip the active best and worst quality values to limits
725 active_best_quality = clamp(active_best_quality,
726 rc->best_quality, rc->worst_quality);
727 active_worst_quality = clamp(active_worst_quality,
728 active_best_quality, rc->worst_quality);
730 *top_index = active_worst_quality;
731 *bottom_index = active_best_quality;
733 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
736 vp9_clear_system_state();
738 // Limit Q range for the adaptive loop.
739 if (cm->frame_type == KEY_FRAME &&
740 !rc->this_key_frame_forced &&
741 !(cm->current_video_frame == 0)) {
742 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
743 active_worst_quality, 2.0);
744 } else if (!rc->is_src_frame_alt_ref &&
745 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
746 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
747 active_worst_quality, 1.75);
749 *top_index = active_worst_quality + qdelta;
750 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
754 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
755 q = active_best_quality;
756 // Special case code to try and match quality with forced key frames
757 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
758 q = rc->last_boosted_qindex;
760 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
761 active_best_quality, active_worst_quality);
762 if (q > *top_index) {
763 // Special case when we are targeting the max allowed rate
764 if (rc->this_frame_target >= rc->max_frame_bandwidth)
770 #if CONFIG_MULTIPLE_ARF
771 // Force the quantizer determined by the coding order pattern.
772 if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
773 cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
775 double current_q = vp9_convert_qindex_to_q(active_worst_quality);
776 int level = cpi->this_frame_weight;
778 new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
779 q = active_worst_quality +
780 vp9_compute_qdelta(rc, current_q, new_q);
784 printf("frame:%d q:%d\n", cm->current_video_frame, q);
787 assert(*top_index <= rc->worst_quality &&
788 *top_index >= rc->best_quality);
789 assert(*bottom_index <= rc->worst_quality &&
790 *bottom_index >= rc->best_quality);
791 assert(q <= rc->worst_quality && q >= rc->best_quality);
795 static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
798 const VP9_COMMON *const cm = &cpi->common;
799 const RATE_CONTROL *const rc = &cpi->rc;
800 const VP9_CONFIG *const oxcf = &cpi->oxcf;
801 int active_best_quality;
802 int active_worst_quality = cpi->twopass.active_worst_quality;
805 if (frame_is_intra_only(cm)) {
806 #if !CONFIG_MULTIPLE_ARF
807 // Handle the special case for key frames forced when we have75 reached
808 // the maximum key frame interval. Here force the Q to a range
809 // based on the ambient Q to reduce the risk of popping.
810 if (rc->this_key_frame_forced) {
811 int qindex = rc->last_boosted_qindex;
812 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
813 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
814 last_boosted_q * 0.75);
815 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
817 // Not forced keyframe.
818 double q_adj_factor = 1.0;
820 // Baseline value derived from cpi->active_worst_quality and kf boost.
821 active_best_quality = get_active_quality(active_worst_quality,
825 kf_high_motion_minq);
827 // Allow somewhat lower kf minq with small image formats.
828 if ((cm->width * cm->height) <= (352 * 288)) {
829 q_adj_factor -= 0.25;
832 // Make a further adjustment based on the kf zero motion measure.
833 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
835 // Convert the adjustment factor to a qindex delta
836 // on active_best_quality.
837 q_val = vp9_convert_qindex_to_q(active_best_quality);
838 active_best_quality += vp9_compute_qdelta(rc, q_val,
839 q_val * q_adj_factor);
843 // Force the KF quantizer to be 30% of the active_worst_quality.
844 current_q = vp9_convert_qindex_to_q(active_worst_quality);
845 active_best_quality = active_worst_quality
846 + vp9_compute_qdelta(rc, current_q, current_q * 0.3);
848 } else if (!rc->is_src_frame_alt_ref &&
849 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
850 // Use the lower of active_worst_quality and recent
851 // average Q as basis for GF/ARF best Q limit unless last frame was
853 if (rc->frames_since_key > 1 &&
854 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
855 q = rc->avg_frame_qindex[INTER_FRAME];
857 q = active_worst_quality;
859 // For constrained quality dont allow Q less than the cq level
860 if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
861 if (q < cpi->cq_target_quality)
862 q = cpi->cq_target_quality;
863 if (rc->frames_since_key > 1) {
864 active_best_quality = get_active_quality(q, rc->gfu_boost,
867 afq_high_motion_minq);
869 active_best_quality = get_active_quality(q, rc->gfu_boost,
872 gf_high_motion_minq);
874 // Constrained quality use slightly lower active best.
875 active_best_quality = active_best_quality * 15 / 16;
877 } else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
878 if (!cpi->refresh_alt_ref_frame) {
879 active_best_quality = cpi->cq_target_quality;
881 if (rc->frames_since_key > 1) {
882 active_best_quality = get_active_quality(
883 q, rc->gfu_boost, gf_low, gf_high,
884 afq_low_motion_minq, afq_high_motion_minq);
886 active_best_quality = get_active_quality(
887 q, rc->gfu_boost, gf_low, gf_high,
888 gf_low_motion_minq, gf_high_motion_minq);
892 active_best_quality = get_active_quality(
893 q, rc->gfu_boost, gf_low, gf_high,
894 gf_low_motion_minq, gf_high_motion_minq);
897 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
898 active_best_quality = cpi->cq_target_quality;
900 active_best_quality = inter_minq[active_worst_quality];
902 // For the constrained quality mode we don't want
903 // q to fall below the cq level.
904 if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
905 (active_best_quality < cpi->cq_target_quality)) {
906 // If we are strongly undershooting the target rate in the last
907 // frames then use the user passed in cq value not the auto
909 if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
910 active_best_quality = oxcf->cq_level;
912 active_best_quality = cpi->cq_target_quality;
917 // Clip the active best and worst quality values to limits.
918 active_best_quality = clamp(active_best_quality,
919 rc->best_quality, rc->worst_quality);
920 active_worst_quality = clamp(active_worst_quality,
921 active_best_quality, rc->worst_quality);
923 *top_index = active_worst_quality;
924 *bottom_index = active_best_quality;
926 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
929 vp9_clear_system_state();
931 // Limit Q range for the adaptive loop.
932 if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
933 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
934 active_worst_quality, 2.0);
935 } else if (!rc->is_src_frame_alt_ref &&
936 (oxcf->end_usage != USAGE_STREAM_FROM_SERVER) &&
937 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
938 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
939 active_worst_quality, 1.75);
941 *top_index = active_worst_quality + qdelta;
942 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
946 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
947 q = active_best_quality;
948 // Special case code to try and match quality with forced key frames.
949 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
950 q = rc->last_boosted_qindex;
952 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
953 active_best_quality, active_worst_quality);
954 if (q > *top_index) {
955 // Special case when we are targeting the max allowed rate.
956 if (rc->this_frame_target >= rc->max_frame_bandwidth)
962 #if CONFIG_MULTIPLE_ARF
963 // Force the quantizer determined by the coding order pattern.
964 if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
965 cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
967 double current_q = vp9_convert_qindex_to_q(active_worst_quality);
968 int level = cpi->this_frame_weight;
970 new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
971 q = active_worst_quality +
972 vp9_compute_qdelta(rc, current_q, new_q);
976 printf("frame:%d q:%d\n", cm->current_video_frame, q);
979 assert(*top_index <= rc->worst_quality &&
980 *top_index >= rc->best_quality);
981 assert(*bottom_index <= rc->worst_quality &&
982 *bottom_index >= rc->best_quality);
983 assert(q <= rc->worst_quality && q >= rc->best_quality);
987 int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi,
988 int *bottom_index, int *top_index) {
990 if (cpi->pass == 0) {
991 if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
992 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
994 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
996 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
999 // Q of 0 is disabled because we force tx size to be
1001 if (cpi->sf.use_nonrd_pick_mode) {
1004 if (cpi->sf.force_frame_boost == 1)
1005 q -= cpi->sf.max_delta_qindex;
1007 if (q < *bottom_index)
1009 else if (q > *top_index)
1015 void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
1016 int this_frame_target,
1017 int *frame_under_shoot_limit,
1018 int *frame_over_shoot_limit) {
1019 // Set-up bounds on acceptable frame size:
1020 if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
1021 *frame_under_shoot_limit = 0;
1022 *frame_over_shoot_limit = INT_MAX;
1024 int recode_tolerance =
1025 (cpi->sf.recode_tolerance * this_frame_target) / 100;
1027 *frame_over_shoot_limit = this_frame_target + recode_tolerance;
1028 *frame_under_shoot_limit = this_frame_target - recode_tolerance;
1030 // For very small rate targets where the fractional adjustment
1031 // may be tiny make sure there is at least a minimum range.
1032 *frame_over_shoot_limit += 200;
1033 *frame_under_shoot_limit -= 200;
1034 if (*frame_under_shoot_limit < 0)
1035 *frame_under_shoot_limit = 0;
1037 // Clip to maximum allowed rate for a frame.
1038 if (*frame_over_shoot_limit > cpi->rc.max_frame_bandwidth) {
1039 *frame_over_shoot_limit = cpi->rc.max_frame_bandwidth;
1044 void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
1045 const VP9_COMMON *const cm = &cpi->common;
1046 RATE_CONTROL *const rc = &cpi->rc;
1048 rc->this_frame_target = target;
1049 // Target rate per SB64 (including partial SB64s.
1050 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1051 (cm->width * cm->height);
1054 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
1055 // this frame refreshes means next frames don't unless specified by user
1056 RATE_CONTROL *const rc = &cpi->rc;
1057 rc->frames_since_golden = 0;
1059 #if CONFIG_MULTIPLE_ARF
1060 if (!cpi->multi_arf_enabled)
1062 // Clear the alternate reference update pending flag.
1063 rc->source_alt_ref_pending = 0;
1065 // Set the alternate reference frame active flag
1066 rc->source_alt_ref_active = 1;
1069 static void update_golden_frame_stats(VP9_COMP *cpi) {
1070 RATE_CONTROL *const rc = &cpi->rc;
1072 // Update the Golden frame usage counts.
1073 if (cpi->refresh_golden_frame) {
1074 // this frame refreshes means next frames don't unless specified by user
1075 rc->frames_since_golden = 0;
1077 if (!rc->source_alt_ref_pending)
1078 rc->source_alt_ref_active = 0;
1080 // Decrement count down till next gf
1081 if (rc->frames_till_gf_update_due > 0)
1082 rc->frames_till_gf_update_due--;
1084 } else if (!cpi->refresh_alt_ref_frame) {
1085 // Decrement count down till next gf
1086 if (rc->frames_till_gf_update_due > 0)
1087 rc->frames_till_gf_update_due--;
1089 rc->frames_since_golden++;
1093 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
1094 const VP9_COMMON *const cm = &cpi->common;
1095 const VP9_CONFIG *const oxcf = &cpi->oxcf;
1096 RATE_CONTROL *const rc = &cpi->rc;
1097 const int qindex = cm->base_qindex;
1099 // Update rate control heuristics
1100 rc->projected_frame_size = (int)(bytes_used << 3);
1102 // Post encode loop adjustment of Q prediction.
1103 vp9_rc_update_rate_correction_factors(
1104 cpi, (cpi->sf.recode_loop >= ALLOW_RECODE_KFARFGF ||
1105 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) ? 2 : 0);
1107 // Keep a record of last Q and ambient average Q.
1108 if (cm->frame_type == KEY_FRAME) {
1109 rc->last_q[KEY_FRAME] = qindex;
1110 rc->avg_frame_qindex[KEY_FRAME] =
1111 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1112 } else if (!rc->is_src_frame_alt_ref &&
1113 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) &&
1114 !(cpi->use_svc && oxcf->end_usage == USAGE_STREAM_FROM_SERVER)) {
1115 rc->last_q[2] = qindex;
1116 rc->avg_frame_qindex[2] =
1117 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[2] + qindex, 2);
1119 rc->last_q[INTER_FRAME] = qindex;
1120 rc->avg_frame_qindex[INTER_FRAME] =
1121 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1123 rc->tot_q += vp9_convert_qindex_to_q(qindex);
1124 rc->avg_q = rc->tot_q / rc->ni_frames;
1125 // Calculate the average Q for normal inter frames (not key or GFU frames).
1126 rc->ni_tot_qi += qindex;
1127 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1130 // Keep record of last boosted (KF/KF/ARF) Q value.
1131 // If the current frame is coded at a lower Q then we also update it.
1132 // If all mbs in this group are skipped only update if the Q value is
1133 // better than that already stored.
1134 // This is used to help set quality in forced key frames to reduce popping
1135 if ((qindex < rc->last_boosted_qindex) ||
1136 ((cpi->static_mb_pct < 100) &&
1137 ((cm->frame_type == KEY_FRAME) || cpi->refresh_alt_ref_frame ||
1138 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1139 rc->last_boosted_qindex = qindex;
1142 update_buffer_level(cpi, rc->projected_frame_size);
1144 // Rolling monitors of whether we are over or underspending used to help
1145 // regulate min and Max Q in two pass.
1146 if (cm->frame_type != KEY_FRAME) {
1147 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1148 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1149 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1150 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1151 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1152 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1153 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1154 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1157 // Actual bits spent
1158 rc->total_actual_bits += rc->projected_frame_size;
1159 rc->total_target_bits += (cm->show_frame ? rc->av_per_frame_bandwidth : 0);
1161 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1163 if (oxcf->play_alternate && cpi->refresh_alt_ref_frame &&
1164 (cm->frame_type != KEY_FRAME))
1165 // Update the alternate reference frame stats as appropriate.
1166 update_alt_ref_frame_stats(cpi);
1168 // Update the Golden frame stats as appropriate.
1169 update_golden_frame_stats(cpi);
1171 if (cm->frame_type == KEY_FRAME)
1172 rc->frames_since_key = 0;
1173 if (cm->show_frame) {
1174 rc->frames_since_key++;
1175 rc->frames_to_key--;
1179 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
1180 // Update buffer level with zero size, update frame counters, and return.
1181 update_buffer_level(cpi, 0);
1182 cpi->common.last_frame_type = cpi->common.frame_type;
1183 cpi->rc.frames_since_key++;
1184 cpi->rc.frames_to_key--;
1187 static int test_for_kf_one_pass(VP9_COMP *cpi) {
1188 // Placeholder function for auto key frame
1191 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1192 #define USE_ALTREF_FOR_ONE_PASS 1
1194 static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1195 static const int af_ratio = 10;
1196 const RATE_CONTROL *const rc = &cpi->rc;
1198 #if USE_ALTREF_FOR_ONE_PASS
1199 target = (!rc->is_src_frame_alt_ref &&
1200 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1201 (rc->av_per_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1202 (rc->baseline_gf_interval + af_ratio - 1) :
1203 (rc->av_per_frame_bandwidth * rc->baseline_gf_interval) /
1204 (rc->baseline_gf_interval + af_ratio - 1);
1206 target = rc->av_per_frame_bandwidth;
1208 return vp9_rc_clamp_pframe_target_size(cpi, target);
1211 static int calc_iframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1212 static const int kf_ratio = 25;
1213 const RATE_CONTROL *rc = &cpi->rc;
1214 int target = rc->av_per_frame_bandwidth * kf_ratio;
1215 return vp9_rc_clamp_iframe_target_size(cpi, target);
1218 void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
1219 VP9_COMMON *const cm = &cpi->common;
1220 RATE_CONTROL *const rc = &cpi->rc;
1222 if (!cpi->refresh_alt_ref_frame &&
1223 (cm->current_video_frame == 0 ||
1224 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1225 rc->frames_to_key == 0 ||
1226 (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
1227 cm->frame_type = KEY_FRAME;
1228 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1229 rc->frames_to_key == 0;
1230 rc->frames_to_key = cpi->key_frame_frequency;
1231 rc->kf_boost = DEFAULT_KF_BOOST;
1232 rc->source_alt_ref_active = 0;
1234 cm->frame_type = INTER_FRAME;
1236 if (rc->frames_till_gf_update_due == 0) {
1237 rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
1238 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1239 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1240 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1241 rc->frames_till_gf_update_due = rc->frames_to_key;
1242 cpi->refresh_golden_frame = 1;
1243 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1244 rc->gfu_boost = DEFAULT_GF_BOOST;
1246 if (cm->frame_type == KEY_FRAME)
1247 target = calc_iframe_target_size_one_pass_vbr(cpi);
1249 target = calc_pframe_target_size_one_pass_vbr(cpi);
1250 vp9_rc_set_frame_target(cpi, target);
1253 static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1254 const VP9_CONFIG *oxcf = &cpi->oxcf;
1255 const RATE_CONTROL *rc = &cpi->rc;
1256 const SVC *const svc = &cpi->svc;
1257 const int64_t diff = oxcf->optimal_buffer_level - rc->buffer_level;
1258 const int64_t one_pct_bits = 1 + oxcf->optimal_buffer_level / 100;
1259 int min_frame_target = MAX(rc->av_per_frame_bandwidth >> 4,
1260 FRAME_OVERHEAD_BITS);
1261 int target = rc->av_per_frame_bandwidth;
1262 if (svc->number_temporal_layers > 1 &&
1263 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
1264 // Note that for layers, av_per_frame_bandwidth is the cumulative
1265 // per-frame-bandwidth. For the target size of this frame, use the
1266 // layer average frame size (i.e., non-cumulative per-frame-bw).
1267 int current_temporal_layer = svc->temporal_layer_id;
1268 const LAYER_CONTEXT *lc = &svc->layer_context[current_temporal_layer];
1269 target = lc->avg_frame_size;
1270 min_frame_target = MAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
1273 // Lower the target bandwidth for this frame.
1274 const int pct_low = (int)MIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1275 target -= (target * pct_low) / 200;
1276 } else if (diff < 0) {
1277 // Increase the target bandwidth for this frame.
1278 const int pct_high = (int)MIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1279 target += (target * pct_high) / 200;
1281 return MAX(min_frame_target, target);
1284 static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1285 const RATE_CONTROL *rc = &cpi->rc;
1286 const VP9_CONFIG *oxcf = &cpi->oxcf;
1287 const SVC *const svc = &cpi->svc;
1289 if (cpi->common.current_video_frame == 0) {
1290 target = ((cpi->oxcf.starting_buffer_level / 2) > INT_MAX)
1291 ? INT_MAX : (int)(cpi->oxcf.starting_buffer_level / 2);
1294 double framerate = oxcf->framerate;
1295 if (svc->number_temporal_layers > 1 &&
1296 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
1297 // Use the layer framerate for temporal layers CBR mode.
1298 const LAYER_CONTEXT *lc = &svc->layer_context[svc->temporal_layer_id];
1299 framerate = lc->framerate;
1301 kf_boost = MAX(kf_boost, (int)(2 * framerate - 16));
1302 if (rc->frames_since_key < framerate / 2) {
1303 kf_boost = (int)(kf_boost * rc->frames_since_key /
1306 target = ((16 + kf_boost) * rc->av_per_frame_bandwidth) >> 4;
1308 return vp9_rc_clamp_iframe_target_size(cpi, target);
1311 void vp9_rc_get_svc_params(VP9_COMP *cpi) {
1312 VP9_COMMON *const cm = &cpi->common;
1313 RATE_CONTROL *const rc = &cpi->rc;
1314 int target = rc->av_per_frame_bandwidth;
1315 if ((cm->current_video_frame == 0) ||
1316 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1317 (cpi->oxcf.auto_key && (rc->frames_since_key %
1318 cpi->key_frame_frequency == 0))) {
1319 cm->frame_type = KEY_FRAME;
1320 rc->source_alt_ref_active = 0;
1321 if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
1322 target = calc_iframe_target_size_one_pass_cbr(cpi);
1325 cm->frame_type = INTER_FRAME;
1326 if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
1327 target = calc_pframe_target_size_one_pass_cbr(cpi);
1330 vp9_rc_set_frame_target(cpi, target);
1331 rc->frames_till_gf_update_due = INT_MAX;
1332 rc->baseline_gf_interval = INT_MAX;
1335 void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
1336 VP9_COMMON *const cm = &cpi->common;
1337 RATE_CONTROL *const rc = &cpi->rc;
1339 if ((cm->current_video_frame == 0 ||
1340 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1341 rc->frames_to_key == 0 ||
1342 (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
1343 cm->frame_type = KEY_FRAME;
1344 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1345 rc->frames_to_key == 0;
1346 rc->frames_to_key = cpi->key_frame_frequency;
1347 rc->kf_boost = DEFAULT_KF_BOOST;
1348 rc->source_alt_ref_active = 0;
1349 target = calc_iframe_target_size_one_pass_cbr(cpi);
1351 cm->frame_type = INTER_FRAME;
1352 target = calc_pframe_target_size_one_pass_cbr(cpi);
1354 vp9_rc_set_frame_target(cpi, target);
1355 // Don't use gf_update by default in CBR mode.
1356 rc->frames_till_gf_update_due = INT_MAX;
1357 rc->baseline_gf_interval = INT_MAX;
1360 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget) {
1361 int start_index = rc->worst_quality;
1362 int target_index = rc->worst_quality;
1365 // Convert the average q value to an index.
1366 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1368 if (vp9_convert_qindex_to_q(i) >= qstart)
1372 // Convert the q target to an index
1373 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1375 if (vp9_convert_qindex_to_q(i) >= qtarget)
1379 return target_index - start_index;
1382 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1383 int qindex, double rate_target_ratio) {
1384 int target_index = rc->worst_quality;
1387 // Look up the current projected bits per block for the base index
1388 const int base_bits_per_mb = vp9_rc_bits_per_mb(frame_type, qindex, 1.0);
1390 // Find the target bits per mb based on the base value and given ratio.
1391 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1393 // Convert the q target to an index
1394 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1396 if (vp9_rc_bits_per_mb(frame_type, i, 1.0) <= target_bits_per_mb )
1400 return target_index - qindex;