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 // Max rate target for 1080P and below encodes under normal circumstances
31 // (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
32 #define MAX_MB_RATE 250
33 #define MAXRATE_1080P 2025000
35 #define DEFAULT_KF_BOOST 2000
36 #define DEFAULT_GF_BOOST 2000
38 #define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
40 #define MIN_BPB_FACTOR 0.005
41 #define MAX_BPB_FACTOR 50
43 // Tables relating active max Q to active min Q
44 static int kf_low_motion_minq[QINDEX_RANGE];
45 static int kf_high_motion_minq[QINDEX_RANGE];
46 static int gf_low_motion_minq[QINDEX_RANGE];
47 static int gf_high_motion_minq[QINDEX_RANGE];
48 static int inter_minq[QINDEX_RANGE];
49 static int afq_low_motion_minq[QINDEX_RANGE];
50 static int afq_high_motion_minq[QINDEX_RANGE];
51 static int gf_high = 2000;
52 static int gf_low = 400;
53 static int kf_high = 5000;
54 static int kf_low = 400;
56 // Functions to compute the active minq lookup table entries based on a
57 // formulaic approach to facilitate easier adjustment of the Q tables.
58 // The formulae were derived from computing a 3rd order polynomial best
59 // fit to the original data (after plotting real maxq vs minq (not q index))
60 static int get_minq_index(double maxq, double x3, double x2, double x1) {
62 const double minqtarget = MIN(((x3 * maxq + x2) * maxq + x1) * maxq,
65 // Special case handling to deal with the step from q2.0
66 // down to lossless mode represented by q 1.0.
67 if (minqtarget <= 2.0)
70 for (i = 0; i < QINDEX_RANGE; i++)
71 if (minqtarget <= vp9_convert_qindex_to_q(i))
74 return QINDEX_RANGE - 1;
77 void vp9_rc_init_minq_luts() {
80 for (i = 0; i < QINDEX_RANGE; i++) {
81 const double maxq = vp9_convert_qindex_to_q(i);
82 kf_low_motion_minq[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.15);
83 kf_high_motion_minq[i] = get_minq_index(maxq, 0.000002, -0.0012, 0.50);
84 gf_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.32);
85 gf_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.50);
86 afq_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.33);
87 afq_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55);
88 inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.55);
92 // These functions use formulaic calculations to make playing with the
93 // quantizer tables easier. If necessary they can be replaced by lookup
94 // tables if and when things settle down in the experimental bitstream
95 double vp9_convert_qindex_to_q(int qindex) {
96 // Convert the index to a real Q value (scaled down to match old Q values)
97 return vp9_ac_quant(qindex, 0) / 4.0;
100 int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
101 double correction_factor) {
102 const double q = vp9_convert_qindex_to_q(qindex);
103 int enumerator = frame_type == KEY_FRAME ? 3300000 : 2250000;
105 // q based adjustment to baseline enumerator
106 enumerator += (int)(enumerator * q) >> 12;
107 return (int)(0.5 + (enumerator * correction_factor / q));
110 static int estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
111 double correction_factor) {
112 const int bpm = (int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor));
113 return ((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS;
116 int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
117 const RATE_CONTROL *rc = &cpi->rc;
118 const int min_frame_target = MAX(rc->min_frame_bandwidth,
119 rc->av_per_frame_bandwidth >> 5);
120 if (target < min_frame_target)
121 target = min_frame_target;
122 if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
123 // If there is an active ARF at this location use the minimum
124 // bits on this frame even if it is a constructed arf.
125 // The active maximum quantizer insures that an appropriate
126 // number of bits will be spent if needed for constructed ARFs.
127 target = min_frame_target;
129 // Clip the frame target to the maximum allowed value.
130 if (target > rc->max_frame_bandwidth)
131 target = rc->max_frame_bandwidth;
135 int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
136 const RATE_CONTROL *rc = &cpi->rc;
137 const VP9_CONFIG *oxcf = &cpi->oxcf;
138 if (oxcf->rc_max_intra_bitrate_pct) {
139 const int max_rate = rc->av_per_frame_bandwidth *
140 oxcf->rc_max_intra_bitrate_pct / 100;
141 target = MIN(target, max_rate);
143 if (target > rc->max_frame_bandwidth)
144 target = rc->max_frame_bandwidth;
149 // Update the buffer level for higher layers, given the encoded current layer.
150 static void update_layer_buffer_level(SVC *svc, int encoded_frame_size) {
151 int temporal_layer = 0;
152 int current_temporal_layer = svc->temporal_layer_id;
153 for (temporal_layer = current_temporal_layer + 1;
154 temporal_layer < svc->number_temporal_layers; ++temporal_layer) {
155 LAYER_CONTEXT *lc = &svc->layer_context[temporal_layer];
156 RATE_CONTROL *lrc = &lc->rc;
157 int bits_off_for_this_layer = (int)(lc->target_bandwidth / lc->framerate -
159 lrc->bits_off_target += bits_off_for_this_layer;
161 // Clip buffer level to maximum buffer size for the layer.
162 lrc->bits_off_target = MIN(lrc->bits_off_target, lc->maximum_buffer_size);
163 lrc->buffer_level = lrc->bits_off_target;
167 // Update the buffer level: leaky bucket model.
168 static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
169 const VP9_COMMON *const cm = &cpi->common;
170 const VP9_CONFIG *oxcf = &cpi->oxcf;
171 RATE_CONTROL *const rc = &cpi->rc;
173 // Non-viewable frames are a special case and are treated as pure overhead.
174 if (!cm->show_frame) {
175 rc->bits_off_target -= encoded_frame_size;
177 rc->bits_off_target += rc->av_per_frame_bandwidth - encoded_frame_size;
180 // Clip the buffer level to the maximum specified buffer size.
181 rc->bits_off_target = MIN(rc->bits_off_target, oxcf->maximum_buffer_size);
182 rc->buffer_level = rc->bits_off_target;
184 if (cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
185 update_layer_buffer_level(&cpi->svc, encoded_frame_size);
189 void vp9_rc_init(const VP9_CONFIG *oxcf, int pass, RATE_CONTROL *rc) {
190 if (pass == 0 && oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
191 rc->avg_frame_qindex[0] = oxcf->worst_allowed_q;
192 rc->avg_frame_qindex[1] = oxcf->worst_allowed_q;
193 rc->avg_frame_qindex[2] = oxcf->worst_allowed_q;
195 rc->avg_frame_qindex[0] = (oxcf->worst_allowed_q +
196 oxcf->best_allowed_q) / 2;
197 rc->avg_frame_qindex[1] = (oxcf->worst_allowed_q +
198 oxcf->best_allowed_q) / 2;
199 rc->avg_frame_qindex[2] = (oxcf->worst_allowed_q +
200 oxcf->best_allowed_q) / 2;
203 rc->last_q[0] = oxcf->best_allowed_q;
204 rc->last_q[1] = oxcf->best_allowed_q;
205 rc->last_q[2] = oxcf->best_allowed_q;
207 rc->buffer_level = oxcf->starting_buffer_level;
208 rc->bits_off_target = oxcf->starting_buffer_level;
210 rc->rolling_target_bits = rc->av_per_frame_bandwidth;
211 rc->rolling_actual_bits = rc->av_per_frame_bandwidth;
212 rc->long_rolling_target_bits = rc->av_per_frame_bandwidth;
213 rc->long_rolling_actual_bits = rc->av_per_frame_bandwidth;
215 rc->total_actual_bits = 0;
216 rc->total_target_vs_actual = 0;
218 rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
219 rc->frames_since_key = 8; // Sensible default for first frame.
220 rc->this_key_frame_forced = 0;
221 rc->next_key_frame_forced = 0;
222 rc->source_alt_ref_pending = 0;
223 rc->source_alt_ref_active = 0;
225 rc->frames_till_gf_update_due = 0;
227 rc->ni_av_qi = oxcf->worst_allowed_q;
232 rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q);
234 rc->rate_correction_factor = 1.0;
235 rc->key_frame_rate_correction_factor = 1.0;
236 rc->gf_rate_correction_factor = 1.0;
239 int vp9_rc_drop_frame(VP9_COMP *cpi) {
240 const VP9_CONFIG *oxcf = &cpi->oxcf;
241 RATE_CONTROL *const rc = &cpi->rc;
243 if (!oxcf->drop_frames_water_mark) {
246 if (rc->buffer_level < 0) {
247 // Always drop if buffer is below 0.
250 // If buffer is below drop_mark, for now just drop every other frame
251 // (starting with the next frame) until it increases back over drop_mark.
252 int drop_mark = (int)(oxcf->drop_frames_water_mark *
253 oxcf->optimal_buffer_level / 100);
254 if ((rc->buffer_level > drop_mark) &&
255 (rc->decimation_factor > 0)) {
256 --rc->decimation_factor;
257 } else if (rc->buffer_level <= drop_mark &&
258 rc->decimation_factor == 0) {
259 rc->decimation_factor = 1;
261 if (rc->decimation_factor > 0) {
262 if (rc->decimation_count > 0) {
263 --rc->decimation_count;
266 rc->decimation_count = rc->decimation_factor;
270 rc->decimation_count = 0;
277 static double get_rate_correction_factor(const VP9_COMP *cpi) {
278 if (cpi->common.frame_type == KEY_FRAME) {
279 return cpi->rc.key_frame_rate_correction_factor;
281 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
282 !cpi->rc.is_src_frame_alt_ref &&
283 !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
284 return cpi->rc.gf_rate_correction_factor;
286 return cpi->rc.rate_correction_factor;
290 static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
291 if (cpi->common.frame_type == KEY_FRAME) {
292 cpi->rc.key_frame_rate_correction_factor = factor;
294 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
295 !cpi->rc.is_src_frame_alt_ref &&
296 !(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
297 cpi->rc.gf_rate_correction_factor = factor;
299 cpi->rc.rate_correction_factor = factor;
303 void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
304 const VP9_COMMON *const cm = &cpi->common;
305 int correction_factor = 100;
306 double rate_correction_factor = get_rate_correction_factor(cpi);
307 double adjustment_limit;
309 int projected_size_based_on_q = 0;
311 // Clear down mmx registers to allow floating point in what follows
312 vp9_clear_system_state();
314 // Work out how big we would have expected the frame to be at this Q given
315 // the current correction factor.
316 // Stay in double to avoid int overflow when values are large
317 projected_size_based_on_q = estimate_bits_at_q(cm->frame_type,
318 cm->base_qindex, cm->MBs,
319 rate_correction_factor);
320 // Work out a size correction factor.
321 if (projected_size_based_on_q > 0)
322 correction_factor = (100 * cpi->rc.projected_frame_size) /
323 projected_size_based_on_q;
325 // More heavily damped adjustment used if we have been oscillating either side
329 adjustment_limit = 0.75;
332 adjustment_limit = 0.375;
336 adjustment_limit = 0.25;
340 if (correction_factor > 102) {
341 // We are not already at the worst allowable quality
342 correction_factor = (int)(100 + ((correction_factor - 100) *
344 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
346 // Keep rate_correction_factor within limits
347 if (rate_correction_factor > MAX_BPB_FACTOR)
348 rate_correction_factor = MAX_BPB_FACTOR;
349 } else if (correction_factor < 99) {
350 // We are not already at the best allowable quality
351 correction_factor = (int)(100 - ((100 - correction_factor) *
353 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
355 // Keep rate_correction_factor within limits
356 if (rate_correction_factor < MIN_BPB_FACTOR)
357 rate_correction_factor = MIN_BPB_FACTOR;
360 set_rate_correction_factor(cpi, rate_correction_factor);
364 int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
365 int active_best_quality, int active_worst_quality) {
366 const VP9_COMMON *const cm = &cpi->common;
367 int q = active_worst_quality;
368 int last_error = INT_MAX;
369 int i, target_bits_per_mb;
370 const double correction_factor = get_rate_correction_factor(cpi);
372 // Calculate required scaling factor based on target frame size and size of
373 // frame produced using previous Q.
375 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
377 i = active_best_quality;
380 const int bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cm->frame_type, i,
383 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
384 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
391 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
393 } while (++i <= active_worst_quality);
398 static int get_active_quality(int q, int gfu_boost, int low, int high,
399 int *low_motion_minq, int *high_motion_minq) {
400 if (gfu_boost > high) {
401 return low_motion_minq[q];
402 } else if (gfu_boost < low) {
403 return high_motion_minq[q];
405 const int gap = high - low;
406 const int offset = high - gfu_boost;
407 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
408 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
409 return low_motion_minq[q] + adjustment;
413 static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
414 const RATE_CONTROL *const rc = &cpi->rc;
415 const unsigned int curr_frame = cpi->common.current_video_frame;
416 int active_worst_quality;
418 if (cpi->common.frame_type == KEY_FRAME) {
419 active_worst_quality = curr_frame == 0 ? rc->worst_quality
420 : rc->last_q[KEY_FRAME] * 2;
422 if (!rc->is_src_frame_alt_ref &&
423 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
424 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
425 : rc->last_q[INTER_FRAME];
427 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
428 : rc->last_q[INTER_FRAME] * 2;
432 return MIN(active_worst_quality, rc->worst_quality);
435 // Adjust active_worst_quality level based on buffer level.
436 static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) {
437 // Adjust active_worst_quality: If buffer is above the optimal/target level,
438 // bring active_worst_quality down depending on fullness of buffer.
439 // If buffer is below the optimal level, let the active_worst_quality go from
440 // ambient Q (at buffer = optimal level) to worst_quality level
441 // (at buffer = critical level).
442 const VP9_COMMON *const cm = &cpi->common;
443 const VP9_CONFIG *oxcf = &cpi->oxcf;
444 const RATE_CONTROL *rc = &cpi->rc;
445 // Buffer level below which we push active_worst to worst_quality.
446 int64_t critical_level = oxcf->optimal_buffer_level >> 2;
447 int64_t buff_lvl_step = 0;
449 int active_worst_quality;
450 if (cm->frame_type == KEY_FRAME)
451 return rc->worst_quality;
452 if (cm->current_video_frame > 1)
453 active_worst_quality = MIN(rc->worst_quality,
454 rc->avg_frame_qindex[INTER_FRAME] * 5 / 4);
456 active_worst_quality = MIN(rc->worst_quality,
457 rc->avg_frame_qindex[KEY_FRAME] * 3 / 2);
458 if (rc->buffer_level > oxcf->optimal_buffer_level) {
460 // Maximum limit for down adjustment, ~30%.
461 int max_adjustment_down = active_worst_quality / 3;
462 if (max_adjustment_down) {
463 buff_lvl_step = ((oxcf->maximum_buffer_size -
464 oxcf->optimal_buffer_level) / max_adjustment_down);
466 adjustment = (int)((rc->buffer_level - oxcf->optimal_buffer_level) /
468 active_worst_quality -= adjustment;
470 } else if (rc->buffer_level > critical_level) {
471 // Adjust up from ambient Q.
472 if (critical_level) {
473 buff_lvl_step = (oxcf->optimal_buffer_level - critical_level);
476 (int)((rc->worst_quality - rc->avg_frame_qindex[INTER_FRAME]) *
477 (oxcf->optimal_buffer_level - rc->buffer_level) /
480 active_worst_quality = rc->avg_frame_qindex[INTER_FRAME] + adjustment;
483 // Set to worst_quality if buffer is below critical level.
484 active_worst_quality = rc->worst_quality;
486 return active_worst_quality;
489 static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi,
492 const VP9_COMMON *const cm = &cpi->common;
493 const RATE_CONTROL *const rc = &cpi->rc;
494 int active_best_quality;
495 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
498 if (frame_is_intra_only(cm)) {
499 active_best_quality = rc->best_quality;
500 // Handle the special case for key frames forced when we have75 reached
501 // the maximum key frame interval. Here force the Q to a range
502 // based on the ambient Q to reduce the risk of popping.
503 if (rc->this_key_frame_forced) {
504 int qindex = rc->last_boosted_qindex;
505 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
506 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
507 (last_boosted_q * 0.75));
508 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
509 } else if (cm->current_video_frame > 0) {
510 // not first frame of one pass and kf_boost is set
511 double q_adj_factor = 1.0;
514 active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
518 kf_high_motion_minq);
520 // Allow somewhat lower kf minq with small image formats.
521 if ((cm->width * cm->height) <= (352 * 288)) {
522 q_adj_factor -= 0.25;
525 // Convert the adjustment factor to a qindex delta
526 // on active_best_quality.
527 q_val = vp9_convert_qindex_to_q(active_best_quality);
528 active_best_quality += vp9_compute_qdelta(rc, q_val,
529 q_val * q_adj_factor);
531 } else if (!rc->is_src_frame_alt_ref &&
533 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
534 // Use the lower of active_worst_quality and recent
535 // average Q as basis for GF/ARF best Q limit unless last frame was
537 if (rc->frames_since_key > 1 &&
538 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
539 q = rc->avg_frame_qindex[INTER_FRAME];
541 q = active_worst_quality;
543 active_best_quality = get_active_quality(
544 q, rc->gfu_boost, gf_low, gf_high,
545 gf_low_motion_minq, gf_high_motion_minq);
547 // Use the lower of active_worst_quality and recent/average Q.
548 if (cm->current_video_frame > 1) {
549 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
550 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
552 active_best_quality = inter_minq[active_worst_quality];
554 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
555 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
557 active_best_quality = inter_minq[active_worst_quality];
561 // Clip the active best and worst quality values to limits
562 active_best_quality = clamp(active_best_quality,
563 rc->best_quality, rc->worst_quality);
564 active_worst_quality = clamp(active_worst_quality,
565 active_best_quality, rc->worst_quality);
567 *top_index = active_worst_quality;
568 *bottom_index = active_best_quality;
570 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
571 // Limit Q range for the adaptive loop.
572 if (cm->frame_type == KEY_FRAME &&
573 !rc->this_key_frame_forced &&
574 !(cm->current_video_frame == 0)) {
576 vp9_clear_system_state();
577 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
578 active_worst_quality, 2.0);
579 *top_index = active_worst_quality + qdelta;
580 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
584 // Special case code to try and match quality with forced key frames
585 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
586 q = rc->last_boosted_qindex;
588 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
589 active_best_quality, active_worst_quality);
590 if (q > *top_index) {
591 // Special case when we are targeting the max allowed rate
592 if (rc->this_frame_target >= rc->max_frame_bandwidth)
598 assert(*top_index <= rc->worst_quality &&
599 *top_index >= rc->best_quality);
600 assert(*bottom_index <= rc->worst_quality &&
601 *bottom_index >= rc->best_quality);
602 assert(q <= rc->worst_quality && q >= rc->best_quality);
606 static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
609 const VP9_COMMON *const cm = &cpi->common;
610 const RATE_CONTROL *const rc = &cpi->rc;
611 const VP9_CONFIG *const oxcf = &cpi->oxcf;
612 int active_best_quality;
613 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
616 if (frame_is_intra_only(cm)) {
617 active_best_quality = rc->best_quality;
618 #if !CONFIG_MULTIPLE_ARF
619 // Handle the special case for key frames forced when we have75 reached
620 // the maximum key frame interval. Here force the Q to a range
621 // based on the ambient Q to reduce the risk of popping.
622 if (rc->this_key_frame_forced) {
623 int qindex = rc->last_boosted_qindex;
624 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
625 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
626 last_boosted_q * 0.75);
627 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
628 } else if (cm->current_video_frame > 0) {
629 // not first frame of one pass and kf_boost is set
630 double q_adj_factor = 1.0;
633 active_best_quality = get_active_quality(rc->avg_frame_qindex[KEY_FRAME],
637 kf_high_motion_minq);
639 // Allow somewhat lower kf minq with small image formats.
640 if ((cm->width * cm->height) <= (352 * 288)) {
641 q_adj_factor -= 0.25;
644 // Convert the adjustment factor to a qindex delta
645 // on active_best_quality.
646 q_val = vp9_convert_qindex_to_q(active_best_quality);
647 active_best_quality += vp9_compute_qdelta(rc, q_val,
648 q_val * q_adj_factor);
652 // Force the KF quantizer to be 30% of the active_worst_quality.
653 current_q = vp9_convert_qindex_to_q(active_worst_quality);
654 active_best_quality = active_worst_quality
655 + vp9_compute_qdelta(rc, current_q, current_q * 0.3);
657 } else if (!rc->is_src_frame_alt_ref &&
658 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
659 // Use the lower of active_worst_quality and recent
660 // average Q as basis for GF/ARF best Q limit unless last frame was
662 if (rc->frames_since_key > 1 &&
663 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
664 q = rc->avg_frame_qindex[INTER_FRAME];
666 q = rc->avg_frame_qindex[KEY_FRAME];
668 // For constrained quality dont allow Q less than the cq level
669 if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
670 if (q < cpi->cq_target_quality)
671 q = cpi->cq_target_quality;
672 if (rc->frames_since_key > 1) {
673 active_best_quality = get_active_quality(q, rc->gfu_boost,
676 afq_high_motion_minq);
678 active_best_quality = get_active_quality(q, rc->gfu_boost,
681 gf_high_motion_minq);
683 // Constrained quality use slightly lower active best.
684 active_best_quality = active_best_quality * 15 / 16;
686 } else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
687 if (!cpi->refresh_alt_ref_frame) {
688 active_best_quality = cpi->cq_target_quality;
690 if (rc->frames_since_key > 1) {
691 active_best_quality = get_active_quality(
692 q, rc->gfu_boost, gf_low, gf_high,
693 afq_low_motion_minq, afq_high_motion_minq);
695 active_best_quality = get_active_quality(
696 q, rc->gfu_boost, gf_low, gf_high,
697 gf_low_motion_minq, gf_high_motion_minq);
701 active_best_quality = get_active_quality(
702 q, rc->gfu_boost, gf_low, gf_high,
703 gf_low_motion_minq, gf_high_motion_minq);
706 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
707 active_best_quality = cpi->cq_target_quality;
709 // Use the lower of active_worst_quality and recent/average Q.
710 if (cm->current_video_frame > 1)
711 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
713 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
714 // For the constrained quality mode we don't want
715 // q to fall below the cq level.
716 if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
717 (active_best_quality < cpi->cq_target_quality)) {
718 // If we are strongly undershooting the target rate in the last
719 // frames then use the user passed in cq value not the auto
721 if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
722 active_best_quality = oxcf->cq_level;
724 active_best_quality = cpi->cq_target_quality;
729 // Clip the active best and worst quality values to limits
730 active_best_quality = clamp(active_best_quality,
731 rc->best_quality, rc->worst_quality);
732 active_worst_quality = clamp(active_worst_quality,
733 active_best_quality, rc->worst_quality);
735 *top_index = active_worst_quality;
736 *bottom_index = active_best_quality;
738 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
741 vp9_clear_system_state();
743 // Limit Q range for the adaptive loop.
744 if (cm->frame_type == KEY_FRAME &&
745 !rc->this_key_frame_forced &&
746 !(cm->current_video_frame == 0)) {
747 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
748 active_worst_quality, 2.0);
749 } else if (!rc->is_src_frame_alt_ref &&
750 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
751 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
752 active_worst_quality, 1.75);
754 *top_index = active_worst_quality + qdelta;
755 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
759 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
760 q = active_best_quality;
761 // Special case code to try and match quality with forced key frames
762 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
763 q = rc->last_boosted_qindex;
765 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
766 active_best_quality, active_worst_quality);
767 if (q > *top_index) {
768 // Special case when we are targeting the max allowed rate
769 if (rc->this_frame_target >= rc->max_frame_bandwidth)
775 #if CONFIG_MULTIPLE_ARF
776 // Force the quantizer determined by the coding order pattern.
777 if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
778 cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
780 double current_q = vp9_convert_qindex_to_q(active_worst_quality);
781 int level = cpi->this_frame_weight;
783 new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
784 q = active_worst_quality +
785 vp9_compute_qdelta(rc, current_q, new_q);
789 printf("frame:%d q:%d\n", cm->current_video_frame, q);
792 assert(*top_index <= rc->worst_quality &&
793 *top_index >= rc->best_quality);
794 assert(*bottom_index <= rc->worst_quality &&
795 *bottom_index >= rc->best_quality);
796 assert(q <= rc->worst_quality && q >= rc->best_quality);
800 static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
803 const VP9_COMMON *const cm = &cpi->common;
804 const RATE_CONTROL *const rc = &cpi->rc;
805 const VP9_CONFIG *const oxcf = &cpi->oxcf;
806 int active_best_quality;
807 int active_worst_quality = cpi->twopass.active_worst_quality;
810 if (frame_is_intra_only(cm)) {
811 #if !CONFIG_MULTIPLE_ARF
812 // Handle the special case for key frames forced when we have75 reached
813 // the maximum key frame interval. Here force the Q to a range
814 // based on the ambient Q to reduce the risk of popping.
815 if (rc->this_key_frame_forced) {
816 int qindex = rc->last_boosted_qindex;
817 double last_boosted_q = vp9_convert_qindex_to_q(qindex);
818 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
819 last_boosted_q * 0.75);
820 active_best_quality = MAX(qindex + delta_qindex, rc->best_quality);
822 // Not forced keyframe.
823 double q_adj_factor = 1.0;
825 // Baseline value derived from cpi->active_worst_quality and kf boost.
826 active_best_quality = get_active_quality(active_worst_quality,
830 kf_high_motion_minq);
832 // Allow somewhat lower kf minq with small image formats.
833 if ((cm->width * cm->height) <= (352 * 288)) {
834 q_adj_factor -= 0.25;
837 // Make a further adjustment based on the kf zero motion measure.
838 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
840 // Convert the adjustment factor to a qindex delta
841 // on active_best_quality.
842 q_val = vp9_convert_qindex_to_q(active_best_quality);
843 active_best_quality += vp9_compute_qdelta(rc, q_val,
844 q_val * q_adj_factor);
848 // Force the KF quantizer to be 30% of the active_worst_quality.
849 current_q = vp9_convert_qindex_to_q(active_worst_quality);
850 active_best_quality = active_worst_quality
851 + vp9_compute_qdelta(rc, current_q, current_q * 0.3);
853 } else if (!rc->is_src_frame_alt_ref &&
854 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
855 // Use the lower of active_worst_quality and recent
856 // average Q as basis for GF/ARF best Q limit unless last frame was
858 if (rc->frames_since_key > 1 &&
859 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
860 q = rc->avg_frame_qindex[INTER_FRAME];
862 q = active_worst_quality;
864 // For constrained quality dont allow Q less than the cq level
865 if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
866 if (q < cpi->cq_target_quality)
867 q = cpi->cq_target_quality;
868 if (rc->frames_since_key > 1) {
869 active_best_quality = get_active_quality(q, rc->gfu_boost,
872 afq_high_motion_minq);
874 active_best_quality = get_active_quality(q, rc->gfu_boost,
877 gf_high_motion_minq);
879 // Constrained quality use slightly lower active best.
880 active_best_quality = active_best_quality * 15 / 16;
882 } else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
883 if (!cpi->refresh_alt_ref_frame) {
884 active_best_quality = cpi->cq_target_quality;
886 if (rc->frames_since_key > 1) {
887 active_best_quality = get_active_quality(
888 q, rc->gfu_boost, gf_low, gf_high,
889 afq_low_motion_minq, afq_high_motion_minq);
891 active_best_quality = get_active_quality(
892 q, rc->gfu_boost, gf_low, gf_high,
893 gf_low_motion_minq, gf_high_motion_minq);
897 active_best_quality = get_active_quality(
898 q, rc->gfu_boost, gf_low, gf_high,
899 gf_low_motion_minq, gf_high_motion_minq);
902 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
903 active_best_quality = cpi->cq_target_quality;
905 active_best_quality = inter_minq[active_worst_quality];
907 // For the constrained quality mode we don't want
908 // q to fall below the cq level.
909 if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
910 (active_best_quality < cpi->cq_target_quality)) {
911 // If we are strongly undershooting the target rate in the last
912 // frames then use the user passed in cq value not the auto
914 if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
915 active_best_quality = oxcf->cq_level;
917 active_best_quality = cpi->cq_target_quality;
922 // Clip the active best and worst quality values to limits.
923 active_best_quality = clamp(active_best_quality,
924 rc->best_quality, rc->worst_quality);
925 active_worst_quality = clamp(active_worst_quality,
926 active_best_quality, rc->worst_quality);
928 *top_index = active_worst_quality;
929 *bottom_index = active_best_quality;
931 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
934 vp9_clear_system_state();
936 // Limit Q range for the adaptive loop.
937 if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
938 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
939 active_worst_quality, 2.0);
940 } else if (!rc->is_src_frame_alt_ref &&
941 (oxcf->end_usage != USAGE_STREAM_FROM_SERVER) &&
942 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
943 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
944 active_worst_quality, 1.75);
946 *top_index = active_worst_quality + qdelta;
947 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
951 if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
952 q = active_best_quality;
953 // Special case code to try and match quality with forced key frames.
954 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
955 q = rc->last_boosted_qindex;
957 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
958 active_best_quality, active_worst_quality);
959 if (q > *top_index) {
960 // Special case when we are targeting the max allowed rate.
961 if (rc->this_frame_target >= rc->max_frame_bandwidth)
967 #if CONFIG_MULTIPLE_ARF
968 // Force the quantizer determined by the coding order pattern.
969 if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
970 cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
972 double current_q = vp9_convert_qindex_to_q(active_worst_quality);
973 int level = cpi->this_frame_weight;
975 new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
976 q = active_worst_quality +
977 vp9_compute_qdelta(rc, current_q, new_q);
981 printf("frame:%d q:%d\n", cm->current_video_frame, q);
984 assert(*top_index <= rc->worst_quality &&
985 *top_index >= rc->best_quality);
986 assert(*bottom_index <= rc->worst_quality &&
987 *bottom_index >= rc->best_quality);
988 assert(q <= rc->worst_quality && q >= rc->best_quality);
992 int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi,
993 int *bottom_index, int *top_index) {
995 if (cpi->pass == 0) {
996 if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
997 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
999 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
1001 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
1004 // Q of 0 is disabled because we force tx size to be
1006 if (cpi->sf.use_nonrd_pick_mode) {
1009 if (cpi->sf.force_frame_boost == 1)
1010 q -= cpi->sf.max_delta_qindex;
1012 if (q < *bottom_index)
1014 else if (q > *top_index)
1020 void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
1021 int this_frame_target,
1022 int *frame_under_shoot_limit,
1023 int *frame_over_shoot_limit) {
1024 // Set-up bounds on acceptable frame size:
1025 if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
1026 *frame_under_shoot_limit = 0;
1027 *frame_over_shoot_limit = INT_MAX;
1029 int recode_tolerance =
1030 (cpi->sf.recode_tolerance * this_frame_target) / 100;
1032 *frame_over_shoot_limit = this_frame_target + recode_tolerance;
1033 *frame_under_shoot_limit = this_frame_target - recode_tolerance;
1035 // For very small rate targets where the fractional adjustment
1036 // may be tiny make sure there is at least a minimum range.
1037 *frame_over_shoot_limit += 200;
1038 *frame_under_shoot_limit -= 200;
1039 if (*frame_under_shoot_limit < 0)
1040 *frame_under_shoot_limit = 0;
1042 // Clip to maximum allowed rate for a frame.
1043 if (*frame_over_shoot_limit > cpi->rc.max_frame_bandwidth) {
1044 *frame_over_shoot_limit = cpi->rc.max_frame_bandwidth;
1049 void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
1050 const VP9_COMMON *const cm = &cpi->common;
1051 RATE_CONTROL *const rc = &cpi->rc;
1053 rc->this_frame_target = target;
1054 // Target rate per SB64 (including partial SB64s.
1055 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1056 (cm->width * cm->height);
1059 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
1060 // this frame refreshes means next frames don't unless specified by user
1061 RATE_CONTROL *const rc = &cpi->rc;
1062 rc->frames_since_golden = 0;
1064 #if CONFIG_MULTIPLE_ARF
1065 if (!cpi->multi_arf_enabled)
1067 // Clear the alternate reference update pending flag.
1068 rc->source_alt_ref_pending = 0;
1070 // Set the alternate reference frame active flag
1071 rc->source_alt_ref_active = 1;
1074 static void update_golden_frame_stats(VP9_COMP *cpi) {
1075 RATE_CONTROL *const rc = &cpi->rc;
1077 // Update the Golden frame usage counts.
1078 if (cpi->refresh_golden_frame) {
1079 // this frame refreshes means next frames don't unless specified by user
1080 rc->frames_since_golden = 0;
1082 if (!rc->source_alt_ref_pending)
1083 rc->source_alt_ref_active = 0;
1085 // Decrement count down till next gf
1086 if (rc->frames_till_gf_update_due > 0)
1087 rc->frames_till_gf_update_due--;
1089 } else if (!cpi->refresh_alt_ref_frame) {
1090 // Decrement count down till next gf
1091 if (rc->frames_till_gf_update_due > 0)
1092 rc->frames_till_gf_update_due--;
1094 rc->frames_since_golden++;
1098 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
1099 const VP9_COMMON *const cm = &cpi->common;
1100 const VP9_CONFIG *const oxcf = &cpi->oxcf;
1101 RATE_CONTROL *const rc = &cpi->rc;
1102 const int qindex = cm->base_qindex;
1104 // Update rate control heuristics
1105 rc->projected_frame_size = (int)(bytes_used << 3);
1107 // Post encode loop adjustment of Q prediction.
1108 vp9_rc_update_rate_correction_factors(
1109 cpi, (cpi->sf.recode_loop >= ALLOW_RECODE_KFARFGF ||
1110 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) ? 2 : 0);
1112 // Keep a record of last Q and ambient average Q.
1113 if (cm->frame_type == KEY_FRAME) {
1114 rc->last_q[KEY_FRAME] = qindex;
1115 rc->avg_frame_qindex[KEY_FRAME] =
1116 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1117 } else if (!rc->is_src_frame_alt_ref &&
1118 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) &&
1119 !(cpi->use_svc && oxcf->end_usage == USAGE_STREAM_FROM_SERVER)) {
1120 rc->last_q[2] = qindex;
1121 rc->avg_frame_qindex[2] =
1122 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[2] + qindex, 2);
1124 rc->last_q[INTER_FRAME] = qindex;
1125 rc->avg_frame_qindex[INTER_FRAME] =
1126 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1128 rc->tot_q += vp9_convert_qindex_to_q(qindex);
1129 rc->avg_q = rc->tot_q / rc->ni_frames;
1130 // Calculate the average Q for normal inter frames (not key or GFU frames).
1131 rc->ni_tot_qi += qindex;
1132 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1135 // Keep record of last boosted (KF/KF/ARF) Q value.
1136 // If the current frame is coded at a lower Q then we also update it.
1137 // If all mbs in this group are skipped only update if the Q value is
1138 // better than that already stored.
1139 // This is used to help set quality in forced key frames to reduce popping
1140 if ((qindex < rc->last_boosted_qindex) ||
1141 ((cpi->static_mb_pct < 100) &&
1142 ((cm->frame_type == KEY_FRAME) || cpi->refresh_alt_ref_frame ||
1143 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1144 rc->last_boosted_qindex = qindex;
1147 update_buffer_level(cpi, rc->projected_frame_size);
1149 // Rolling monitors of whether we are over or underspending used to help
1150 // regulate min and Max Q in two pass.
1151 if (cm->frame_type != KEY_FRAME) {
1152 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1153 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1154 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1155 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1156 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1157 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1158 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1159 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1162 // Actual bits spent
1163 rc->total_actual_bits += rc->projected_frame_size;
1164 rc->total_target_bits += (cm->show_frame ? rc->av_per_frame_bandwidth : 0);
1166 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1168 if (oxcf->play_alternate && cpi->refresh_alt_ref_frame &&
1169 (cm->frame_type != KEY_FRAME))
1170 // Update the alternate reference frame stats as appropriate.
1171 update_alt_ref_frame_stats(cpi);
1173 // Update the Golden frame stats as appropriate.
1174 update_golden_frame_stats(cpi);
1176 if (cm->frame_type == KEY_FRAME)
1177 rc->frames_since_key = 0;
1178 if (cm->show_frame) {
1179 rc->frames_since_key++;
1180 rc->frames_to_key--;
1184 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
1185 // Update buffer level with zero size, update frame counters, and return.
1186 update_buffer_level(cpi, 0);
1187 cpi->common.last_frame_type = cpi->common.frame_type;
1188 cpi->rc.frames_since_key++;
1189 cpi->rc.frames_to_key--;
1192 static int test_for_kf_one_pass(VP9_COMP *cpi) {
1193 // Placeholder function for auto key frame
1196 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1197 #define USE_ALTREF_FOR_ONE_PASS 1
1199 static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1200 static const int af_ratio = 10;
1201 const RATE_CONTROL *const rc = &cpi->rc;
1203 #if USE_ALTREF_FOR_ONE_PASS
1204 target = (!rc->is_src_frame_alt_ref &&
1205 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1206 (rc->av_per_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1207 (rc->baseline_gf_interval + af_ratio - 1) :
1208 (rc->av_per_frame_bandwidth * rc->baseline_gf_interval) /
1209 (rc->baseline_gf_interval + af_ratio - 1);
1211 target = rc->av_per_frame_bandwidth;
1213 return vp9_rc_clamp_pframe_target_size(cpi, target);
1216 static int calc_iframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1217 static const int kf_ratio = 25;
1218 const RATE_CONTROL *rc = &cpi->rc;
1219 int target = rc->av_per_frame_bandwidth * kf_ratio;
1220 return vp9_rc_clamp_iframe_target_size(cpi, target);
1223 void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
1224 VP9_COMMON *const cm = &cpi->common;
1225 RATE_CONTROL *const rc = &cpi->rc;
1227 if (!cpi->refresh_alt_ref_frame &&
1228 (cm->current_video_frame == 0 ||
1229 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1230 rc->frames_to_key == 0 ||
1231 (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
1232 cm->frame_type = KEY_FRAME;
1233 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1234 rc->frames_to_key == 0;
1235 rc->frames_to_key = cpi->key_frame_frequency;
1236 rc->kf_boost = DEFAULT_KF_BOOST;
1237 rc->source_alt_ref_active = 0;
1239 cm->frame_type = INTER_FRAME;
1241 if (rc->frames_till_gf_update_due == 0) {
1242 rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
1243 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1244 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1245 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1246 rc->frames_till_gf_update_due = rc->frames_to_key;
1247 cpi->refresh_golden_frame = 1;
1248 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1249 rc->gfu_boost = DEFAULT_GF_BOOST;
1251 if (cm->frame_type == KEY_FRAME)
1252 target = calc_iframe_target_size_one_pass_vbr(cpi);
1254 target = calc_pframe_target_size_one_pass_vbr(cpi);
1255 vp9_rc_set_frame_target(cpi, target);
1258 static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1259 const VP9_CONFIG *oxcf = &cpi->oxcf;
1260 const RATE_CONTROL *rc = &cpi->rc;
1261 const SVC *const svc = &cpi->svc;
1262 const int64_t diff = oxcf->optimal_buffer_level - rc->buffer_level;
1263 const int64_t one_pct_bits = 1 + oxcf->optimal_buffer_level / 100;
1264 int min_frame_target = MAX(rc->av_per_frame_bandwidth >> 4,
1265 FRAME_OVERHEAD_BITS);
1266 int target = rc->av_per_frame_bandwidth;
1267 if (svc->number_temporal_layers > 1 &&
1268 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
1269 // Note that for layers, av_per_frame_bandwidth is the cumulative
1270 // per-frame-bandwidth. For the target size of this frame, use the
1271 // layer average frame size (i.e., non-cumulative per-frame-bw).
1272 int current_temporal_layer = svc->temporal_layer_id;
1273 const LAYER_CONTEXT *lc = &svc->layer_context[current_temporal_layer];
1274 target = lc->avg_frame_size;
1275 min_frame_target = MAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
1278 // Lower the target bandwidth for this frame.
1279 const int pct_low = (int)MIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1280 target -= (target * pct_low) / 200;
1281 } else if (diff < 0) {
1282 // Increase the target bandwidth for this frame.
1283 const int pct_high = (int)MIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1284 target += (target * pct_high) / 200;
1286 return MAX(min_frame_target, target);
1289 static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1290 const RATE_CONTROL *rc = &cpi->rc;
1291 const VP9_CONFIG *oxcf = &cpi->oxcf;
1292 const SVC *const svc = &cpi->svc;
1294 if (cpi->common.current_video_frame == 0) {
1295 target = ((cpi->oxcf.starting_buffer_level / 2) > INT_MAX)
1296 ? INT_MAX : (int)(cpi->oxcf.starting_buffer_level / 2);
1299 double framerate = oxcf->framerate;
1300 if (svc->number_temporal_layers > 1 &&
1301 oxcf->end_usage == USAGE_STREAM_FROM_SERVER) {
1302 // Use the layer framerate for temporal layers CBR mode.
1303 const LAYER_CONTEXT *lc = &svc->layer_context[svc->temporal_layer_id];
1304 framerate = lc->framerate;
1306 kf_boost = MAX(kf_boost, (int)(2 * framerate - 16));
1307 if (rc->frames_since_key < framerate / 2) {
1308 kf_boost = (int)(kf_boost * rc->frames_since_key /
1311 target = ((16 + kf_boost) * rc->av_per_frame_bandwidth) >> 4;
1313 return vp9_rc_clamp_iframe_target_size(cpi, target);
1316 void vp9_rc_get_svc_params(VP9_COMP *cpi) {
1317 VP9_COMMON *const cm = &cpi->common;
1318 RATE_CONTROL *const rc = &cpi->rc;
1319 int target = rc->av_per_frame_bandwidth;
1320 if ((cm->current_video_frame == 0) ||
1321 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1322 (cpi->oxcf.auto_key && (rc->frames_since_key %
1323 cpi->key_frame_frequency == 0))) {
1324 cm->frame_type = KEY_FRAME;
1325 rc->source_alt_ref_active = 0;
1326 if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
1327 target = calc_iframe_target_size_one_pass_cbr(cpi);
1330 cm->frame_type = INTER_FRAME;
1331 if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
1332 target = calc_pframe_target_size_one_pass_cbr(cpi);
1335 vp9_rc_set_frame_target(cpi, target);
1336 rc->frames_till_gf_update_due = INT_MAX;
1337 rc->baseline_gf_interval = INT_MAX;
1340 void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
1341 VP9_COMMON *const cm = &cpi->common;
1342 RATE_CONTROL *const rc = &cpi->rc;
1344 if ((cm->current_video_frame == 0 ||
1345 (cm->frame_flags & FRAMEFLAGS_KEY) ||
1346 rc->frames_to_key == 0 ||
1347 (cpi->oxcf.auto_key && test_for_kf_one_pass(cpi)))) {
1348 cm->frame_type = KEY_FRAME;
1349 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1350 rc->frames_to_key == 0;
1351 rc->frames_to_key = cpi->key_frame_frequency;
1352 rc->kf_boost = DEFAULT_KF_BOOST;
1353 rc->source_alt_ref_active = 0;
1354 target = calc_iframe_target_size_one_pass_cbr(cpi);
1356 cm->frame_type = INTER_FRAME;
1357 target = calc_pframe_target_size_one_pass_cbr(cpi);
1359 vp9_rc_set_frame_target(cpi, target);
1360 // Don't use gf_update by default in CBR mode.
1361 rc->frames_till_gf_update_due = INT_MAX;
1362 rc->baseline_gf_interval = INT_MAX;
1365 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget) {
1366 int start_index = rc->worst_quality;
1367 int target_index = rc->worst_quality;
1370 // Convert the average q value to an index.
1371 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1373 if (vp9_convert_qindex_to_q(i) >= qstart)
1377 // Convert the q target to an index
1378 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1380 if (vp9_convert_qindex_to_q(i) >= qtarget)
1384 return target_index - start_index;
1387 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1388 int qindex, double rate_target_ratio) {
1389 int target_index = rc->worst_quality;
1392 // Look up the current projected bits per block for the base index
1393 const int base_bits_per_mb = vp9_rc_bits_per_mb(frame_type, qindex, 1.0);
1395 // Find the target bits per mb based on the base value and given ratio.
1396 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1398 // Convert the q target to an index
1399 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1401 if (vp9_rc_bits_per_mb(frame_type, i, 1.0) <= target_bits_per_mb )
1405 return target_index - qindex;
1408 void vp9_rc_update_framerate(VP9_COMP *cpi) {
1409 const VP9_COMMON *const cm = &cpi->common;
1410 const VP9_CONFIG *const oxcf = &cpi->oxcf;
1411 RATE_CONTROL *const rc = &cpi->rc;
1414 rc->av_per_frame_bandwidth = (int)(oxcf->target_bandwidth / oxcf->framerate);
1415 rc->min_frame_bandwidth = (int)(rc->av_per_frame_bandwidth *
1416 oxcf->two_pass_vbrmin_section / 100);
1418 rc->min_frame_bandwidth = MAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
1420 // A maximum bitrate for a frame is defined.
1421 // The baseline for this aligns with HW implementations that
1422 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
1423 // per 16x16 MB (averaged over a frame). However this limit is extended if
1424 // a very high rate is given on the command line or the the rate cannnot
1425 // be acheived because of a user specificed max q (e.g. when the user
1426 // specifies lossless encode.
1427 vbr_max_bits = (int)(((int64_t)rc->av_per_frame_bandwidth *
1428 oxcf->two_pass_vbrmax_section) / 100);
1429 rc->max_frame_bandwidth = MAX(MAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P),
1432 // Set Maximum gf/arf interval
1433 rc->max_gf_interval = 16;
1435 // Extended interval for genuinely static scenes
1436 rc->static_scene_max_gf_interval = cpi->key_frame_frequency >> 1;
1438 // Special conditions when alt ref frame enabled in lagged compress mode
1439 if (oxcf->play_alternate && oxcf->lag_in_frames) {
1440 if (rc->max_gf_interval > oxcf->lag_in_frames - 1)
1441 rc->max_gf_interval = oxcf->lag_in_frames - 1;
1443 if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
1444 rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
1447 if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
1448 rc->max_gf_interval = rc->static_scene_max_gf_interval;