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_dsp/vpx_dsp_common.h"
19 #include "vpx_mem/vpx_mem.h"
20 #include "vpx_ports/mem.h"
21 #include "vpx_ports/system_state.h"
23 #include "vp9/common/vp9_alloccommon.h"
24 #include "vp9/encoder/vp9_aq_cyclicrefresh.h"
25 #include "vp9/common/vp9_common.h"
26 #include "vp9/common/vp9_entropymode.h"
27 #include "vp9/common/vp9_quant_common.h"
28 #include "vp9/common/vp9_seg_common.h"
30 #include "vp9/encoder/vp9_encodemv.h"
31 #include "vp9/encoder/vp9_ratectrl.h"
33 // Max rate target for 1080P and below encodes under normal circumstances
34 // (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
35 #define MAX_MB_RATE 250
36 #define MAXRATE_1080P 2025000
38 #define DEFAULT_KF_BOOST 2000
39 #define DEFAULT_GF_BOOST 2000
41 #define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
43 #define MIN_BPB_FACTOR 0.005
44 #define MAX_BPB_FACTOR 50
46 #define FRAME_OVERHEAD_BITS 200
48 #if CONFIG_VP9_HIGHBITDEPTH
49 #define ASSIGN_MINQ_TABLE(bit_depth, name) \
51 switch (bit_depth) { \
62 assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10" \
68 #define ASSIGN_MINQ_TABLE(bit_depth, name) \
75 // Tables relating active max Q to active min Q
76 static int kf_low_motion_minq_8[QINDEX_RANGE];
77 static int kf_high_motion_minq_8[QINDEX_RANGE];
78 static int arfgf_low_motion_minq_8[QINDEX_RANGE];
79 static int arfgf_high_motion_minq_8[QINDEX_RANGE];
80 static int inter_minq_8[QINDEX_RANGE];
81 static int rtc_minq_8[QINDEX_RANGE];
83 #if CONFIG_VP9_HIGHBITDEPTH
84 static int kf_low_motion_minq_10[QINDEX_RANGE];
85 static int kf_high_motion_minq_10[QINDEX_RANGE];
86 static int arfgf_low_motion_minq_10[QINDEX_RANGE];
87 static int arfgf_high_motion_minq_10[QINDEX_RANGE];
88 static int inter_minq_10[QINDEX_RANGE];
89 static int rtc_minq_10[QINDEX_RANGE];
90 static int kf_low_motion_minq_12[QINDEX_RANGE];
91 static int kf_high_motion_minq_12[QINDEX_RANGE];
92 static int arfgf_low_motion_minq_12[QINDEX_RANGE];
93 static int arfgf_high_motion_minq_12[QINDEX_RANGE];
94 static int inter_minq_12[QINDEX_RANGE];
95 static int rtc_minq_12[QINDEX_RANGE];
98 static int gf_high = 2000;
99 static int gf_low = 400;
100 static int kf_high = 5000;
101 static int kf_low = 400;
103 // Functions to compute the active minq lookup table entries based on a
104 // formulaic approach to facilitate easier adjustment of the Q tables.
105 // The formulae were derived from computing a 3rd order polynomial best
106 // fit to the original data (after plotting real maxq vs minq (not q index))
107 static int get_minq_index(double maxq, double x3, double x2, double x1,
108 vpx_bit_depth_t bit_depth) {
110 const double minqtarget = VPXMIN(((x3 * maxq + x2) * maxq + x1) * maxq,
113 // Special case handling to deal with the step from q2.0
114 // down to lossless mode represented by q 1.0.
115 if (minqtarget <= 2.0)
118 for (i = 0; i < QINDEX_RANGE; i++) {
119 if (minqtarget <= vp9_convert_qindex_to_q(i, bit_depth))
123 return QINDEX_RANGE - 1;
126 static void init_minq_luts(int *kf_low_m, int *kf_high_m,
127 int *arfgf_low, int *arfgf_high,
128 int *inter, int *rtc, vpx_bit_depth_t bit_depth) {
130 for (i = 0; i < QINDEX_RANGE; i++) {
131 const double maxq = vp9_convert_qindex_to_q(i, bit_depth);
132 kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth);
133 kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
134 arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
135 arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
136 inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth);
137 rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
141 void vp9_rc_init_minq_luts(void) {
142 init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8,
143 arfgf_low_motion_minq_8, arfgf_high_motion_minq_8,
144 inter_minq_8, rtc_minq_8, VPX_BITS_8);
145 #if CONFIG_VP9_HIGHBITDEPTH
146 init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10,
147 arfgf_low_motion_minq_10, arfgf_high_motion_minq_10,
148 inter_minq_10, rtc_minq_10, VPX_BITS_10);
149 init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12,
150 arfgf_low_motion_minq_12, arfgf_high_motion_minq_12,
151 inter_minq_12, rtc_minq_12, VPX_BITS_12);
155 // These functions use formulaic calculations to make playing with the
156 // quantizer tables easier. If necessary they can be replaced by lookup
157 // tables if and when things settle down in the experimental bitstream
158 double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) {
159 // Convert the index to a real Q value (scaled down to match old Q values)
160 #if CONFIG_VP9_HIGHBITDEPTH
163 return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
165 return vp9_ac_quant(qindex, 0, bit_depth) / 16.0;
167 return vp9_ac_quant(qindex, 0, bit_depth) / 64.0;
169 assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12");
173 return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
177 int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
178 double correction_factor,
179 vpx_bit_depth_t bit_depth) {
180 const double q = vp9_convert_qindex_to_q(qindex, bit_depth);
181 int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000;
183 assert(correction_factor <= MAX_BPB_FACTOR &&
184 correction_factor >= MIN_BPB_FACTOR);
186 // q based adjustment to baseline enumerator
187 enumerator += (int)(enumerator * q) >> 12;
188 return (int)(enumerator * correction_factor / q);
191 int vp9_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
192 double correction_factor,
193 vpx_bit_depth_t bit_depth) {
194 const int bpm = (int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor,
196 return VPXMAX(FRAME_OVERHEAD_BITS,
197 (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
200 int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
201 const RATE_CONTROL *rc = &cpi->rc;
202 const VP9EncoderConfig *oxcf = &cpi->oxcf;
203 const int min_frame_target = VPXMAX(rc->min_frame_bandwidth,
204 rc->avg_frame_bandwidth >> 5);
205 if (target < min_frame_target)
206 target = min_frame_target;
207 if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
208 // If there is an active ARF at this location use the minimum
209 // bits on this frame even if it is a constructed arf.
210 // The active maximum quantizer insures that an appropriate
211 // number of bits will be spent if needed for constructed ARFs.
212 target = min_frame_target;
214 // Clip the frame target to the maximum allowed value.
215 if (target > rc->max_frame_bandwidth)
216 target = rc->max_frame_bandwidth;
217 if (oxcf->rc_max_inter_bitrate_pct) {
218 const int max_rate = rc->avg_frame_bandwidth *
219 oxcf->rc_max_inter_bitrate_pct / 100;
220 target = VPXMIN(target, max_rate);
225 int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
226 const RATE_CONTROL *rc = &cpi->rc;
227 const VP9EncoderConfig *oxcf = &cpi->oxcf;
228 if (oxcf->rc_max_intra_bitrate_pct) {
229 const int max_rate = rc->avg_frame_bandwidth *
230 oxcf->rc_max_intra_bitrate_pct / 100;
231 target = VPXMIN(target, max_rate);
233 if (target > rc->max_frame_bandwidth)
234 target = rc->max_frame_bandwidth;
238 // Update the buffer level for higher temporal layers, given the encoded current
240 static void update_layer_buffer_level(SVC *svc, int encoded_frame_size) {
242 int current_temporal_layer = svc->temporal_layer_id;
243 for (i = current_temporal_layer + 1;
244 i < svc->number_temporal_layers; ++i) {
245 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i,
246 svc->number_temporal_layers);
247 LAYER_CONTEXT *lc = &svc->layer_context[layer];
248 RATE_CONTROL *lrc = &lc->rc;
249 int bits_off_for_this_layer = (int)(lc->target_bandwidth / lc->framerate -
251 lrc->bits_off_target += bits_off_for_this_layer;
253 // Clip buffer level to maximum buffer size for the layer.
254 lrc->bits_off_target =
255 VPXMIN(lrc->bits_off_target, lrc->maximum_buffer_size);
256 lrc->buffer_level = lrc->bits_off_target;
260 // Update the buffer level: leaky bucket model.
261 static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
262 const VP9_COMMON *const cm = &cpi->common;
263 RATE_CONTROL *const rc = &cpi->rc;
265 // Non-viewable frames are a special case and are treated as pure overhead.
266 if (!cm->show_frame) {
267 rc->bits_off_target -= encoded_frame_size;
269 rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
272 // Clip the buffer level to the maximum specified buffer size.
273 rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size);
275 // For screen-content mode, and if frame-dropper is off, don't let buffer
276 // level go below threshold, given here as -rc->maximum_ buffer_size.
277 if (cpi->oxcf.content == VP9E_CONTENT_SCREEN &&
278 cpi->oxcf.drop_frames_water_mark == 0)
279 rc->bits_off_target = VPXMAX(rc->bits_off_target, -rc->maximum_buffer_size);
281 rc->buffer_level = rc->bits_off_target;
283 if (is_one_pass_cbr_svc(cpi)) {
284 update_layer_buffer_level(&cpi->svc, encoded_frame_size);
288 int vp9_rc_get_default_min_gf_interval(
289 int width, int height, double framerate) {
290 // Assume we do not need any constraint lower than 4K 20 fps
291 static const double factor_safe = 3840 * 2160 * 20.0;
292 const double factor = width * height * framerate;
293 const int default_interval =
294 clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL);
296 if (factor <= factor_safe)
297 return default_interval;
299 return VPXMAX(default_interval,
300 (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
301 // Note this logic makes:
307 int vp9_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) {
308 int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75));
309 interval += (interval & 0x01); // Round to even value
310 return VPXMAX(interval, min_gf_interval);
313 void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
316 if (pass == 0 && oxcf->rc_mode == VPX_CBR) {
317 rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
318 rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
320 rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q +
321 oxcf->best_allowed_q) / 2;
322 rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
323 oxcf->best_allowed_q) / 2;
326 rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
327 rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
329 rc->buffer_level = rc->starting_buffer_level;
330 rc->bits_off_target = rc->starting_buffer_level;
332 rc->rolling_target_bits = rc->avg_frame_bandwidth;
333 rc->rolling_actual_bits = rc->avg_frame_bandwidth;
334 rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
335 rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
337 rc->total_actual_bits = 0;
338 rc->total_target_bits = 0;
339 rc->total_target_vs_actual = 0;
341 rc->frames_since_key = 8; // Sensible default for first frame.
342 rc->this_key_frame_forced = 0;
343 rc->next_key_frame_forced = 0;
344 rc->source_alt_ref_pending = 0;
345 rc->source_alt_ref_active = 0;
347 rc->frames_till_gf_update_due = 0;
348 rc->ni_av_qi = oxcf->worst_allowed_q;
353 rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
355 for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
356 rc->rate_correction_factors[i] = 1.0;
359 rc->min_gf_interval = oxcf->min_gf_interval;
360 rc->max_gf_interval = oxcf->max_gf_interval;
361 if (rc->min_gf_interval == 0)
362 rc->min_gf_interval = vp9_rc_get_default_min_gf_interval(
363 oxcf->width, oxcf->height, oxcf->init_framerate);
364 if (rc->max_gf_interval == 0)
365 rc->max_gf_interval = vp9_rc_get_default_max_gf_interval(
366 oxcf->init_framerate, rc->min_gf_interval);
367 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
370 int vp9_rc_drop_frame(VP9_COMP *cpi) {
371 const VP9EncoderConfig *oxcf = &cpi->oxcf;
372 RATE_CONTROL *const rc = &cpi->rc;
373 if (!oxcf->drop_frames_water_mark ||
374 (is_one_pass_cbr_svc(cpi) &&
375 cpi->svc.spatial_layer_id > cpi->svc.first_spatial_layer_to_encode)) {
378 if (rc->buffer_level < 0) {
379 // Always drop if buffer is below 0.
382 // If buffer is below drop_mark, for now just drop every other frame
383 // (starting with the next frame) until it increases back over drop_mark.
384 int drop_mark = (int)(oxcf->drop_frames_water_mark *
385 rc->optimal_buffer_level / 100);
386 if ((rc->buffer_level > drop_mark) &&
387 (rc->decimation_factor > 0)) {
388 --rc->decimation_factor;
389 } else if (rc->buffer_level <= drop_mark &&
390 rc->decimation_factor == 0) {
391 rc->decimation_factor = 1;
393 if (rc->decimation_factor > 0) {
394 if (rc->decimation_count > 0) {
395 --rc->decimation_count;
398 rc->decimation_count = rc->decimation_factor;
402 rc->decimation_count = 0;
409 static double get_rate_correction_factor(const VP9_COMP *cpi) {
410 const RATE_CONTROL *const rc = &cpi->rc;
413 if (cpi->common.frame_type == KEY_FRAME) {
414 rcf = rc->rate_correction_factors[KF_STD];
415 } else if (cpi->oxcf.pass == 2) {
416 RATE_FACTOR_LEVEL rf_lvl =
417 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
418 rcf = rc->rate_correction_factors[rf_lvl];
420 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
421 !rc->is_src_frame_alt_ref && !cpi->use_svc &&
422 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
423 rcf = rc->rate_correction_factors[GF_ARF_STD];
425 rcf = rc->rate_correction_factors[INTER_NORMAL];
427 rcf *= rcf_mult[rc->frame_size_selector];
428 return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
431 static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
432 RATE_CONTROL *const rc = &cpi->rc;
434 // Normalize RCF to account for the size-dependent scaling factor.
435 factor /= rcf_mult[cpi->rc.frame_size_selector];
437 factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
439 if (cpi->common.frame_type == KEY_FRAME) {
440 rc->rate_correction_factors[KF_STD] = factor;
441 } else if (cpi->oxcf.pass == 2) {
442 RATE_FACTOR_LEVEL rf_lvl =
443 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
444 rc->rate_correction_factors[rf_lvl] = factor;
446 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
447 !rc->is_src_frame_alt_ref && !cpi->use_svc &&
448 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
449 rc->rate_correction_factors[GF_ARF_STD] = factor;
451 rc->rate_correction_factors[INTER_NORMAL] = factor;
455 void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) {
456 const VP9_COMMON *const cm = &cpi->common;
457 int correction_factor = 100;
458 double rate_correction_factor = get_rate_correction_factor(cpi);
459 double adjustment_limit;
461 int projected_size_based_on_q = 0;
463 // Do not update the rate factors for arf overlay frames.
464 if (cpi->rc.is_src_frame_alt_ref)
467 // Clear down mmx registers to allow floating point in what follows
468 vpx_clear_system_state();
470 // Work out how big we would have expected the frame to be at this Q given
471 // the current correction factor.
472 // Stay in double to avoid int overflow when values are large
473 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) {
474 projected_size_based_on_q =
475 vp9_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
477 projected_size_based_on_q = vp9_estimate_bits_at_q(cpi->common.frame_type,
480 rate_correction_factor,
483 // Work out a size correction factor.
484 if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
485 correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) /
486 projected_size_based_on_q);
488 // More heavily damped adjustment used if we have been oscillating either side
490 adjustment_limit = 0.25 +
491 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor)));
493 cpi->rc.q_2_frame = cpi->rc.q_1_frame;
494 cpi->rc.q_1_frame = cm->base_qindex;
495 cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
496 if (correction_factor > 110)
497 cpi->rc.rc_1_frame = -1;
498 else if (correction_factor < 90)
499 cpi->rc.rc_1_frame = 1;
501 cpi->rc.rc_1_frame = 0;
503 if (correction_factor > 102) {
504 // We are not already at the worst allowable quality
505 correction_factor = (int)(100 + ((correction_factor - 100) *
507 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
508 // Keep rate_correction_factor within limits
509 if (rate_correction_factor > MAX_BPB_FACTOR)
510 rate_correction_factor = MAX_BPB_FACTOR;
511 } else if (correction_factor < 99) {
512 // We are not already at the best allowable quality
513 correction_factor = (int)(100 - ((100 - correction_factor) *
515 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
517 // Keep rate_correction_factor within limits
518 if (rate_correction_factor < MIN_BPB_FACTOR)
519 rate_correction_factor = MIN_BPB_FACTOR;
522 set_rate_correction_factor(cpi, rate_correction_factor);
526 int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
527 int active_best_quality, int active_worst_quality) {
528 const VP9_COMMON *const cm = &cpi->common;
529 int q = active_worst_quality;
530 int last_error = INT_MAX;
531 int i, target_bits_per_mb, bits_per_mb_at_this_q;
532 const double correction_factor = get_rate_correction_factor(cpi);
534 // Calculate required scaling factor based on target frame size and size of
535 // frame produced using previous Q.
537 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
539 i = active_best_quality;
542 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ &&
544 cpi->svc.temporal_layer_id == 0) {
545 bits_per_mb_at_this_q =
546 (int)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
548 bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cm->frame_type, i,
553 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
554 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
561 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
563 } while (++i <= active_worst_quality);
565 // In CBR mode, this makes sure q is between oscillating Qs to prevent
567 if (cpi->oxcf.rc_mode == VPX_CBR &&
568 (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
569 cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
570 q = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
571 VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
576 static int get_active_quality(int q, int gfu_boost, int low, int high,
577 int *low_motion_minq, int *high_motion_minq) {
578 if (gfu_boost > high) {
579 return low_motion_minq[q];
580 } else if (gfu_boost < low) {
581 return high_motion_minq[q];
583 const int gap = high - low;
584 const int offset = high - gfu_boost;
585 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
586 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
587 return low_motion_minq[q] + adjustment;
591 static int get_kf_active_quality(const RATE_CONTROL *const rc, int q,
592 vpx_bit_depth_t bit_depth) {
593 int *kf_low_motion_minq;
594 int *kf_high_motion_minq;
595 ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq);
596 ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq);
597 return get_active_quality(q, rc->kf_boost, kf_low, kf_high,
598 kf_low_motion_minq, kf_high_motion_minq);
601 static int get_gf_active_quality(const RATE_CONTROL *const rc, int q,
602 vpx_bit_depth_t bit_depth) {
603 int *arfgf_low_motion_minq;
604 int *arfgf_high_motion_minq;
605 ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq);
606 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
607 return get_active_quality(q, rc->gfu_boost, gf_low, gf_high,
608 arfgf_low_motion_minq, arfgf_high_motion_minq);
611 static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
612 const RATE_CONTROL *const rc = &cpi->rc;
613 const unsigned int curr_frame = cpi->common.current_video_frame;
614 int active_worst_quality;
616 if (cpi->common.frame_type == KEY_FRAME) {
617 active_worst_quality = curr_frame == 0 ? rc->worst_quality
618 : rc->last_q[KEY_FRAME] * 2;
620 if (!rc->is_src_frame_alt_ref &&
621 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
622 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
623 : rc->last_q[INTER_FRAME];
625 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
626 : rc->last_q[INTER_FRAME] * 2;
629 return VPXMIN(active_worst_quality, rc->worst_quality);
632 // Adjust active_worst_quality level based on buffer level.
633 static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) {
634 // Adjust active_worst_quality: If buffer is above the optimal/target level,
635 // bring active_worst_quality down depending on fullness of buffer.
636 // If buffer is below the optimal level, let the active_worst_quality go from
637 // ambient Q (at buffer = optimal level) to worst_quality level
638 // (at buffer = critical level).
639 const VP9_COMMON *const cm = &cpi->common;
640 const RATE_CONTROL *rc = &cpi->rc;
641 // Buffer level below which we push active_worst to worst_quality.
642 int64_t critical_level = rc->optimal_buffer_level >> 3;
643 int64_t buff_lvl_step = 0;
645 int active_worst_quality;
647 unsigned int num_frames_weight_key = 5 * cpi->svc.number_temporal_layers;
648 if (cm->frame_type == KEY_FRAME)
649 return rc->worst_quality;
650 // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME]
651 // for the first few frames following key frame. These are both initialized
652 // to worst_quality and updated with (3/4, 1/4) average in postencode_update.
653 // So for first few frames following key, the qp of that key frame is weighted
654 // into the active_worst_quality setting.
655 ambient_qp = (cm->current_video_frame < num_frames_weight_key) ?
656 VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
657 rc->avg_frame_qindex[KEY_FRAME]) :
658 rc->avg_frame_qindex[INTER_FRAME];
659 active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4);
660 if (rc->buffer_level > rc->optimal_buffer_level) {
662 // Maximum limit for down adjustment, ~30%.
663 int max_adjustment_down = active_worst_quality / 3;
664 if (max_adjustment_down) {
665 buff_lvl_step = ((rc->maximum_buffer_size -
666 rc->optimal_buffer_level) / max_adjustment_down);
668 adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) /
670 active_worst_quality -= adjustment;
672 } else if (rc->buffer_level > critical_level) {
673 // Adjust up from ambient Q.
674 if (critical_level) {
675 buff_lvl_step = (rc->optimal_buffer_level - critical_level);
677 adjustment = (int)((rc->worst_quality - ambient_qp) *
678 (rc->optimal_buffer_level - rc->buffer_level) /
681 active_worst_quality = ambient_qp + adjustment;
684 // Set to worst_quality if buffer is below critical level.
685 active_worst_quality = rc->worst_quality;
687 return active_worst_quality;
690 static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi,
693 const VP9_COMMON *const cm = &cpi->common;
694 const RATE_CONTROL *const rc = &cpi->rc;
695 int active_best_quality;
696 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
699 ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq);
701 if (frame_is_intra_only(cm)) {
702 active_best_quality = rc->best_quality;
703 // Handle the special case for key frames forced when we have reached
704 // the maximum key frame interval. Here force the Q to a range
705 // based on the ambient Q to reduce the risk of popping.
706 if (rc->this_key_frame_forced) {
707 int qindex = rc->last_boosted_qindex;
708 double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
709 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
710 (last_boosted_q * 0.75),
712 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
713 } else if (cm->current_video_frame > 0) {
714 // not first frame of one pass and kf_boost is set
715 double q_adj_factor = 1.0;
718 active_best_quality =
719 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
722 // Allow somewhat lower kf minq with small image formats.
723 if ((cm->width * cm->height) <= (352 * 288)) {
724 q_adj_factor -= 0.25;
727 // Convert the adjustment factor to a qindex delta
728 // on active_best_quality.
729 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
730 active_best_quality += vp9_compute_qdelta(rc, q_val,
731 q_val * q_adj_factor,
734 } else if (!rc->is_src_frame_alt_ref &&
736 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
737 // Use the lower of active_worst_quality and recent
738 // average Q as basis for GF/ARF best Q limit unless last frame was
740 if (rc->frames_since_key > 1 &&
741 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
742 q = rc->avg_frame_qindex[INTER_FRAME];
744 q = active_worst_quality;
746 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
748 // Use the lower of active_worst_quality and recent/average Q.
749 if (cm->current_video_frame > 1) {
750 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
751 active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]];
753 active_best_quality = rtc_minq[active_worst_quality];
755 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
756 active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]];
758 active_best_quality = rtc_minq[active_worst_quality];
762 // Clip the active best and worst quality values to limits
763 active_best_quality = clamp(active_best_quality,
764 rc->best_quality, rc->worst_quality);
765 active_worst_quality = clamp(active_worst_quality,
766 active_best_quality, rc->worst_quality);
768 *top_index = active_worst_quality;
769 *bottom_index = active_best_quality;
771 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
772 // Limit Q range for the adaptive loop.
773 if (cm->frame_type == KEY_FRAME &&
774 !rc->this_key_frame_forced &&
775 !(cm->current_video_frame == 0)) {
777 vpx_clear_system_state();
778 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
779 active_worst_quality, 2.0,
781 *top_index = active_worst_quality + qdelta;
782 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
786 // Special case code to try and match quality with forced key frames
787 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
788 q = rc->last_boosted_qindex;
790 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
791 active_best_quality, active_worst_quality);
792 if (q > *top_index) {
793 // Special case when we are targeting the max allowed rate
794 if (rc->this_frame_target >= rc->max_frame_bandwidth)
800 assert(*top_index <= rc->worst_quality &&
801 *top_index >= rc->best_quality);
802 assert(*bottom_index <= rc->worst_quality &&
803 *bottom_index >= rc->best_quality);
804 assert(q <= rc->worst_quality && q >= rc->best_quality);
808 static int get_active_cq_level(const RATE_CONTROL *rc,
809 const VP9EncoderConfig *const oxcf) {
810 static const double cq_adjust_threshold = 0.1;
811 int active_cq_level = oxcf->cq_level;
812 if (oxcf->rc_mode == VPX_CQ &&
813 rc->total_target_bits > 0) {
814 const double x = (double)rc->total_actual_bits / rc->total_target_bits;
815 if (x < cq_adjust_threshold) {
816 active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold);
819 return active_cq_level;
822 static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
825 const VP9_COMMON *const cm = &cpi->common;
826 const RATE_CONTROL *const rc = &cpi->rc;
827 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
828 const int cq_level = get_active_cq_level(rc, oxcf);
829 int active_best_quality;
830 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
833 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
835 if (frame_is_intra_only(cm)) {
836 // Handle the special case for key frames forced when we have reached
837 // the maximum key frame interval. Here force the Q to a range
838 // based on the ambient Q to reduce the risk of popping.
839 if (rc->this_key_frame_forced) {
840 int qindex = rc->last_boosted_qindex;
841 double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
842 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
843 last_boosted_q * 0.75,
845 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
847 // not first frame of one pass and kf_boost is set
848 double q_adj_factor = 1.0;
851 active_best_quality =
852 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
855 // Allow somewhat lower kf minq with small image formats.
856 if ((cm->width * cm->height) <= (352 * 288)) {
857 q_adj_factor -= 0.25;
860 // Convert the adjustment factor to a qindex delta
861 // on active_best_quality.
862 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
863 active_best_quality += vp9_compute_qdelta(rc, q_val,
864 q_val * q_adj_factor,
867 } else if (!rc->is_src_frame_alt_ref &&
868 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
869 // Use the lower of active_worst_quality and recent
870 // average Q as basis for GF/ARF best Q limit unless last frame was
872 if (rc->frames_since_key > 1 &&
873 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
874 q = rc->avg_frame_qindex[INTER_FRAME];
876 q = rc->avg_frame_qindex[KEY_FRAME];
878 // For constrained quality dont allow Q less than the cq level
879 if (oxcf->rc_mode == VPX_CQ) {
883 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
885 // Constrained quality use slightly lower active best.
886 active_best_quality = active_best_quality * 15 / 16;
888 } else if (oxcf->rc_mode == VPX_Q) {
889 if (!cpi->refresh_alt_ref_frame) {
890 active_best_quality = cq_level;
892 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
895 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
898 if (oxcf->rc_mode == VPX_Q) {
899 active_best_quality = cq_level;
901 // Use the lower of active_worst_quality and recent/average Q.
902 if (cm->current_video_frame > 1)
903 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
905 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
906 // For the constrained quality mode we don't want
907 // q to fall below the cq level.
908 if ((oxcf->rc_mode == VPX_CQ) &&
909 (active_best_quality < cq_level)) {
910 active_best_quality = cq_level;
915 // Clip the active best and worst quality values to limits
916 active_best_quality = clamp(active_best_quality,
917 rc->best_quality, rc->worst_quality);
918 active_worst_quality = clamp(active_worst_quality,
919 active_best_quality, rc->worst_quality);
921 *top_index = active_worst_quality;
922 *bottom_index = active_best_quality;
924 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
927 vpx_clear_system_state();
929 // Limit Q range for the adaptive loop.
930 if (cm->frame_type == KEY_FRAME &&
931 !rc->this_key_frame_forced &&
932 !(cm->current_video_frame == 0)) {
933 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
934 active_worst_quality, 2.0,
936 } else if (!rc->is_src_frame_alt_ref &&
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,
942 *top_index = active_worst_quality + qdelta;
943 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
947 if (oxcf->rc_mode == VPX_Q) {
948 q = active_best_quality;
949 // Special case code to try and match quality with forced key frames
950 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
951 q = rc->last_boosted_qindex;
953 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
954 active_best_quality, active_worst_quality);
955 if (q > *top_index) {
956 // Special case when we are targeting the max allowed rate
957 if (rc->this_frame_target >= rc->max_frame_bandwidth)
964 assert(*top_index <= rc->worst_quality &&
965 *top_index >= rc->best_quality);
966 assert(*bottom_index <= rc->worst_quality &&
967 *bottom_index >= rc->best_quality);
968 assert(q <= rc->worst_quality && q >= rc->best_quality);
972 int vp9_frame_type_qdelta(const VP9_COMP *cpi, int rf_level, int q) {
973 static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
974 1.00, // INTER_NORMAL
980 static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] =
981 {INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME};
982 const VP9_COMMON *const cm = &cpi->common;
983 int qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level],
984 q, rate_factor_deltas[rf_level],
989 #define STATIC_MOTION_THRESH 95
990 static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
993 const VP9_COMMON *const cm = &cpi->common;
994 const RATE_CONTROL *const rc = &cpi->rc;
995 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
996 const GF_GROUP *gf_group = &cpi->twopass.gf_group;
997 const int cq_level = get_active_cq_level(rc, oxcf);
998 int active_best_quality;
999 int active_worst_quality = cpi->twopass.active_worst_quality;
1002 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
1004 if (frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi)) {
1005 // Handle the special case for key frames forced when we have reached
1006 // the maximum key frame interval. Here force the Q to a range
1007 // based on the ambient Q to reduce the risk of popping.
1008 if (rc->this_key_frame_forced) {
1009 double last_boosted_q;
1013 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1014 qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1015 active_best_quality = qindex;
1016 last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
1017 delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
1018 last_boosted_q * 1.25,
1020 active_worst_quality =
1021 VPXMIN(qindex + delta_qindex, active_worst_quality);
1023 qindex = rc->last_boosted_qindex;
1024 last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
1025 delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
1026 last_boosted_q * 0.75,
1028 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
1031 // Not forced keyframe.
1032 double q_adj_factor = 1.0;
1034 // Baseline value derived from cpi->active_worst_quality and kf boost.
1035 active_best_quality = get_kf_active_quality(rc, active_worst_quality,
1038 // Allow somewhat lower kf minq with small image formats.
1039 if ((cm->width * cm->height) <= (352 * 288)) {
1040 q_adj_factor -= 0.25;
1043 // Make a further adjustment based on the kf zero motion measure.
1044 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
1046 // Convert the adjustment factor to a qindex delta
1047 // on active_best_quality.
1048 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
1049 active_best_quality += vp9_compute_qdelta(rc, q_val,
1050 q_val * q_adj_factor,
1053 } else if (!rc->is_src_frame_alt_ref &&
1054 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1055 // Use the lower of active_worst_quality and recent
1056 // average Q as basis for GF/ARF best Q limit unless last frame was
1058 if (rc->frames_since_key > 1 &&
1059 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
1060 q = rc->avg_frame_qindex[INTER_FRAME];
1062 q = active_worst_quality;
1064 // For constrained quality dont allow Q less than the cq level
1065 if (oxcf->rc_mode == VPX_CQ) {
1069 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1071 // Constrained quality use slightly lower active best.
1072 active_best_quality = active_best_quality * 15 / 16;
1074 } else if (oxcf->rc_mode == VPX_Q) {
1075 if (!cpi->refresh_alt_ref_frame) {
1076 active_best_quality = cq_level;
1078 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1080 // Modify best quality for second level arfs. For mode VPX_Q this
1081 // becomes the baseline frame q.
1082 if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
1083 active_best_quality = (active_best_quality + cq_level + 1) / 2;
1086 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1089 if (oxcf->rc_mode == VPX_Q) {
1090 active_best_quality = cq_level;
1092 active_best_quality = inter_minq[active_worst_quality];
1094 // For the constrained quality mode we don't want
1095 // q to fall below the cq level.
1096 if ((oxcf->rc_mode == VPX_CQ) &&
1097 (active_best_quality < cq_level)) {
1098 active_best_quality = cq_level;
1103 // Extension to max or min Q if undershoot or overshoot is outside
1104 // the permitted range.
1105 if ((cpi->oxcf.rc_mode != VPX_Q) &&
1106 (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) {
1107 if (frame_is_intra_only(cm) ||
1108 (!rc->is_src_frame_alt_ref &&
1109 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
1110 active_best_quality -=
1111 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
1112 active_worst_quality += (cpi->twopass.extend_maxq / 2);
1114 active_best_quality -=
1115 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
1116 active_worst_quality += cpi->twopass.extend_maxq;
1120 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
1121 vpx_clear_system_state();
1122 // Static forced key frames Q restrictions dealt with elsewhere.
1123 if (!((frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi))) ||
1124 !rc->this_key_frame_forced ||
1125 (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
1126 int qdelta = vp9_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
1127 active_worst_quality);
1128 active_worst_quality = VPXMAX(active_worst_quality + qdelta,
1129 active_best_quality);
1133 // Modify active_best_quality for downscaled normal frames.
1134 if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
1135 int qdelta = vp9_compute_qdelta_by_rate(rc, cm->frame_type,
1136 active_best_quality, 2.0,
1138 active_best_quality =
1139 VPXMAX(active_best_quality + qdelta, rc->best_quality);
1142 active_best_quality = clamp(active_best_quality,
1143 rc->best_quality, rc->worst_quality);
1144 active_worst_quality = clamp(active_worst_quality,
1145 active_best_quality, rc->worst_quality);
1147 if (oxcf->rc_mode == VPX_Q) {
1148 q = active_best_quality;
1149 // Special case code to try and match quality with forced key frames.
1150 } else if ((frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi)) &&
1151 rc->this_key_frame_forced) {
1152 // If static since last kf use better of last boosted and last kf q.
1153 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1154 q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1156 q = rc->last_boosted_qindex;
1159 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
1160 active_best_quality, active_worst_quality);
1161 if (q > active_worst_quality) {
1162 // Special case when we are targeting the max allowed rate.
1163 if (rc->this_frame_target >= rc->max_frame_bandwidth)
1164 active_worst_quality = q;
1166 q = active_worst_quality;
1169 clamp(q, active_best_quality, active_worst_quality);
1171 *top_index = active_worst_quality;
1172 *bottom_index = active_best_quality;
1174 assert(*top_index <= rc->worst_quality &&
1175 *top_index >= rc->best_quality);
1176 assert(*bottom_index <= rc->worst_quality &&
1177 *bottom_index >= rc->best_quality);
1178 assert(q <= rc->worst_quality && q >= rc->best_quality);
1182 int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi,
1183 int *bottom_index, int *top_index) {
1185 if (cpi->oxcf.pass == 0) {
1186 if (cpi->oxcf.rc_mode == VPX_CBR)
1187 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
1189 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
1191 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
1193 if (cpi->sf.use_nonrd_pick_mode) {
1194 if (cpi->sf.force_frame_boost == 1)
1195 q -= cpi->sf.max_delta_qindex;
1197 if (q < *bottom_index)
1199 else if (q > *top_index)
1205 void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
1207 int *frame_under_shoot_limit,
1208 int *frame_over_shoot_limit) {
1209 if (cpi->oxcf.rc_mode == VPX_Q) {
1210 *frame_under_shoot_limit = 0;
1211 *frame_over_shoot_limit = INT_MAX;
1213 // For very small rate targets where the fractional adjustment
1214 // may be tiny make sure there is at least a minimum range.
1215 const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100;
1216 *frame_under_shoot_limit = VPXMAX(frame_target - tolerance - 200, 0);
1217 *frame_over_shoot_limit = VPXMIN(frame_target + tolerance + 200,
1218 cpi->rc.max_frame_bandwidth);
1222 void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
1223 const VP9_COMMON *const cm = &cpi->common;
1224 RATE_CONTROL *const rc = &cpi->rc;
1226 rc->this_frame_target = target;
1228 // Modify frame size target when down-scaling.
1229 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
1230 rc->frame_size_selector != UNSCALED)
1231 rc->this_frame_target = (int)(rc->this_frame_target
1232 * rate_thresh_mult[rc->frame_size_selector]);
1234 // Target rate per SB64 (including partial SB64s.
1235 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1236 (cm->width * cm->height);
1239 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
1240 // this frame refreshes means next frames don't unless specified by user
1241 RATE_CONTROL *const rc = &cpi->rc;
1242 rc->frames_since_golden = 0;
1244 // Mark the alt ref as done (setting to 0 means no further alt refs pending).
1245 rc->source_alt_ref_pending = 0;
1247 // Set the alternate reference frame active flag
1248 rc->source_alt_ref_active = 1;
1251 static void update_golden_frame_stats(VP9_COMP *cpi) {
1252 RATE_CONTROL *const rc = &cpi->rc;
1254 // Update the Golden frame usage counts.
1255 if (cpi->refresh_golden_frame) {
1256 // this frame refreshes means next frames don't unless specified by user
1257 rc->frames_since_golden = 0;
1259 // If we are not using alt ref in the up and coming group clear the arf
1261 if (!rc->source_alt_ref_pending) {
1262 rc->source_alt_ref_active = 0;
1265 // Decrement count down till next gf
1266 if (rc->frames_till_gf_update_due > 0)
1267 rc->frames_till_gf_update_due--;
1269 } else if (!cpi->refresh_alt_ref_frame) {
1270 // Decrement count down till next gf
1271 if (rc->frames_till_gf_update_due > 0)
1272 rc->frames_till_gf_update_due--;
1274 rc->frames_since_golden++;
1278 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
1279 const VP9_COMMON *const cm = &cpi->common;
1280 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1281 RATE_CONTROL *const rc = &cpi->rc;
1282 const int qindex = cm->base_qindex;
1284 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
1285 vp9_cyclic_refresh_postencode(cpi);
1288 // Update rate control heuristics
1289 rc->projected_frame_size = (int)(bytes_used << 3);
1291 // Post encode loop adjustment of Q prediction.
1292 vp9_rc_update_rate_correction_factors(cpi);
1294 // Keep a record of last Q and ambient average Q.
1295 if (cm->frame_type == KEY_FRAME) {
1296 rc->last_q[KEY_FRAME] = qindex;
1297 rc->avg_frame_qindex[KEY_FRAME] =
1298 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1301 SVC *svc = &cpi->svc;
1302 for (i = 0; i < svc->number_temporal_layers; ++i) {
1303 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i,
1304 svc->number_temporal_layers);
1305 LAYER_CONTEXT *lc = &svc->layer_context[layer];
1306 RATE_CONTROL *lrc = &lc->rc;
1307 lrc->last_q[KEY_FRAME] = rc->last_q[KEY_FRAME];
1308 lrc->avg_frame_qindex[KEY_FRAME] = rc->avg_frame_qindex[KEY_FRAME];
1312 if (rc->is_src_frame_alt_ref ||
1313 !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) ||
1314 (cpi->use_svc && oxcf->rc_mode == VPX_CBR)) {
1315 rc->last_q[INTER_FRAME] = qindex;
1316 rc->avg_frame_qindex[INTER_FRAME] =
1317 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1319 rc->tot_q += vp9_convert_qindex_to_q(qindex, cm->bit_depth);
1320 rc->avg_q = rc->tot_q / rc->ni_frames;
1321 // Calculate the average Q for normal inter frames (not key or GFU
1323 rc->ni_tot_qi += qindex;
1324 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1328 // Keep record of last boosted (KF/KF/ARF) Q value.
1329 // If the current frame is coded at a lower Q then we also update it.
1330 // If all mbs in this group are skipped only update if the Q value is
1331 // better than that already stored.
1332 // This is used to help set quality in forced key frames to reduce popping
1333 if ((qindex < rc->last_boosted_qindex) ||
1334 (cm->frame_type == KEY_FRAME) ||
1335 (!rc->constrained_gf_group &&
1336 (cpi->refresh_alt_ref_frame ||
1337 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1338 rc->last_boosted_qindex = qindex;
1340 if (cm->frame_type == KEY_FRAME)
1341 rc->last_kf_qindex = qindex;
1343 update_buffer_level(cpi, rc->projected_frame_size);
1345 // Rolling monitors of whether we are over or underspending used to help
1346 // regulate min and Max Q in two pass.
1347 if (cm->frame_type != KEY_FRAME) {
1348 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1349 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1350 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1351 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1352 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1353 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1354 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1355 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1358 // Actual bits spent
1359 rc->total_actual_bits += rc->projected_frame_size;
1360 rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
1362 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1364 if (!cpi->use_svc || is_two_pass_svc(cpi)) {
1365 if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame &&
1366 (cm->frame_type != KEY_FRAME))
1367 // Update the alternate reference frame stats as appropriate.
1368 update_alt_ref_frame_stats(cpi);
1370 // Update the Golden frame stats as appropriate.
1371 update_golden_frame_stats(cpi);
1374 if (cm->frame_type == KEY_FRAME)
1375 rc->frames_since_key = 0;
1376 if (cm->show_frame) {
1377 rc->frames_since_key++;
1378 rc->frames_to_key--;
1381 // Trigger the resizing of the next frame if it is scaled.
1382 if (oxcf->pass != 0) {
1383 cpi->resize_pending =
1384 rc->next_frame_size_selector != rc->frame_size_selector;
1385 rc->frame_size_selector = rc->next_frame_size_selector;
1389 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
1390 // Update buffer level with zero size, update frame counters, and return.
1391 update_buffer_level(cpi, 0);
1392 cpi->rc.frames_since_key++;
1393 cpi->rc.frames_to_key--;
1394 cpi->rc.rc_2_frame = 0;
1395 cpi->rc.rc_1_frame = 0;
1398 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1399 #define USE_ALTREF_FOR_ONE_PASS 1
1401 static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1402 static const int af_ratio = 10;
1403 const RATE_CONTROL *const rc = &cpi->rc;
1405 #if USE_ALTREF_FOR_ONE_PASS
1406 target = (!rc->is_src_frame_alt_ref &&
1407 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1408 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1409 (rc->baseline_gf_interval + af_ratio - 1) :
1410 (rc->avg_frame_bandwidth * rc->baseline_gf_interval) /
1411 (rc->baseline_gf_interval + af_ratio - 1);
1413 target = rc->avg_frame_bandwidth;
1415 return vp9_rc_clamp_pframe_target_size(cpi, target);
1418 static int calc_iframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1419 static const int kf_ratio = 25;
1420 const RATE_CONTROL *rc = &cpi->rc;
1421 const int target = rc->avg_frame_bandwidth * kf_ratio;
1422 return vp9_rc_clamp_iframe_target_size(cpi, target);
1425 void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
1426 VP9_COMMON *const cm = &cpi->common;
1427 RATE_CONTROL *const rc = &cpi->rc;
1429 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1430 if (!cpi->refresh_alt_ref_frame &&
1431 (cm->current_video_frame == 0 ||
1432 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1433 rc->frames_to_key == 0 ||
1434 (cpi->oxcf.auto_key && 0))) {
1435 cm->frame_type = KEY_FRAME;
1436 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1437 rc->frames_to_key == 0;
1438 rc->frames_to_key = cpi->oxcf.key_freq;
1439 rc->kf_boost = DEFAULT_KF_BOOST;
1440 rc->source_alt_ref_active = 0;
1442 cm->frame_type = INTER_FRAME;
1444 if (rc->frames_till_gf_update_due == 0) {
1445 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
1446 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1447 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1448 if (rc->frames_till_gf_update_due > rc->frames_to_key) {
1449 rc->frames_till_gf_update_due = rc->frames_to_key;
1450 rc->constrained_gf_group = 1;
1452 rc->constrained_gf_group = 0;
1454 cpi->refresh_golden_frame = 1;
1455 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1456 rc->gfu_boost = DEFAULT_GF_BOOST;
1458 if (cm->frame_type == KEY_FRAME)
1459 target = calc_iframe_target_size_one_pass_vbr(cpi);
1461 target = calc_pframe_target_size_one_pass_vbr(cpi);
1462 vp9_rc_set_frame_target(cpi, target);
1465 static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1466 const VP9EncoderConfig *oxcf = &cpi->oxcf;
1467 const RATE_CONTROL *rc = &cpi->rc;
1468 const SVC *const svc = &cpi->svc;
1469 const int64_t diff = rc->optimal_buffer_level - rc->buffer_level;
1470 const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100;
1471 int min_frame_target =
1472 VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS);
1475 if (oxcf->gf_cbr_boost_pct) {
1476 const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100;
1477 target = cpi->refresh_golden_frame ?
1478 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) /
1479 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) :
1480 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) /
1481 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100);
1483 target = rc->avg_frame_bandwidth;
1485 if (is_one_pass_cbr_svc(cpi)) {
1486 // Note that for layers, avg_frame_bandwidth is the cumulative
1487 // per-frame-bandwidth. For the target size of this frame, use the
1488 // layer average frame size (i.e., non-cumulative per-frame-bw).
1490 LAYER_IDS_TO_IDX(svc->spatial_layer_id,
1491 svc->temporal_layer_id, svc->number_temporal_layers);
1492 const LAYER_CONTEXT *lc = &svc->layer_context[layer];
1493 target = lc->avg_frame_size;
1494 min_frame_target = VPXMAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
1497 // Lower the target bandwidth for this frame.
1498 const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1499 target -= (target * pct_low) / 200;
1500 } else if (diff < 0) {
1501 // Increase the target bandwidth for this frame.
1502 const int pct_high =
1503 (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1504 target += (target * pct_high) / 200;
1506 if (oxcf->rc_max_inter_bitrate_pct) {
1507 const int max_rate = rc->avg_frame_bandwidth *
1508 oxcf->rc_max_inter_bitrate_pct / 100;
1509 target = VPXMIN(target, max_rate);
1511 return VPXMAX(min_frame_target, target);
1514 static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1515 const RATE_CONTROL *rc = &cpi->rc;
1516 const VP9EncoderConfig *oxcf = &cpi->oxcf;
1517 const SVC *const svc = &cpi->svc;
1519 if (cpi->common.current_video_frame == 0) {
1520 target = ((rc->starting_buffer_level / 2) > INT_MAX)
1521 ? INT_MAX : (int)(rc->starting_buffer_level / 2);
1524 double framerate = cpi->framerate;
1525 if (svc->number_temporal_layers > 1 &&
1526 oxcf->rc_mode == VPX_CBR) {
1527 // Use the layer framerate for temporal layers CBR mode.
1528 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id,
1529 svc->temporal_layer_id, svc->number_temporal_layers);
1530 const LAYER_CONTEXT *lc = &svc->layer_context[layer];
1531 framerate = lc->framerate;
1533 kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16));
1534 if (rc->frames_since_key < framerate / 2) {
1535 kf_boost = (int)(kf_boost * rc->frames_since_key /
1538 target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4;
1540 return vp9_rc_clamp_iframe_target_size(cpi, target);
1543 // Reset information needed to set proper reference frames and buffer updates
1544 // for temporal layering. This is called when a key frame is encoded.
1545 static void reset_temporal_layer_to_zero(VP9_COMP *cpi) {
1547 LAYER_CONTEXT *lc = NULL;
1548 cpi->svc.temporal_layer_id = 0;
1550 for (sl = 0; sl < cpi->svc.number_spatial_layers; ++sl) {
1551 lc = &cpi->svc.layer_context[sl * cpi->svc.number_temporal_layers];
1552 lc->current_video_frame_in_layer = 0;
1553 lc->frames_from_key_frame = 0;
1557 void vp9_rc_get_svc_params(VP9_COMP *cpi) {
1558 VP9_COMMON *const cm = &cpi->common;
1559 RATE_CONTROL *const rc = &cpi->rc;
1560 int target = rc->avg_frame_bandwidth;
1561 int layer = LAYER_IDS_TO_IDX(cpi->svc.spatial_layer_id,
1562 cpi->svc.temporal_layer_id, cpi->svc.number_temporal_layers);
1564 if ((cm->current_video_frame == 0) ||
1565 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1566 (cpi->oxcf.auto_key && (rc->frames_since_key %
1567 cpi->oxcf.key_freq == 0))) {
1568 cm->frame_type = KEY_FRAME;
1569 rc->source_alt_ref_active = 0;
1571 if (is_two_pass_svc(cpi)) {
1572 cpi->svc.layer_context[layer].is_key_frame = 1;
1573 cpi->ref_frame_flags &=
1574 (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
1575 } else if (is_one_pass_cbr_svc(cpi)) {
1576 reset_temporal_layer_to_zero(cpi);
1577 layer = LAYER_IDS_TO_IDX(cpi->svc.spatial_layer_id,
1578 cpi->svc.temporal_layer_id, cpi->svc.number_temporal_layers);
1579 cpi->svc.layer_context[layer].is_key_frame = 1;
1580 cpi->ref_frame_flags &=
1581 (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
1582 // Assumption here is that LAST_FRAME is being updated for a keyframe.
1583 // Thus no change in update flags.
1584 target = calc_iframe_target_size_one_pass_cbr(cpi);
1587 cm->frame_type = INTER_FRAME;
1588 if (is_two_pass_svc(cpi)) {
1589 LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer];
1590 if (cpi->svc.spatial_layer_id == 0) {
1591 lc->is_key_frame = 0;
1594 cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame;
1595 if (lc->is_key_frame)
1596 cpi->ref_frame_flags &= (~VP9_LAST_FLAG);
1598 cpi->ref_frame_flags &= (~VP9_ALT_FLAG);
1599 } else if (is_one_pass_cbr_svc(cpi)) {
1600 LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer];
1601 if (cpi->svc.spatial_layer_id == cpi->svc.first_spatial_layer_to_encode) {
1602 lc->is_key_frame = 0;
1605 cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame;
1607 target = calc_pframe_target_size_one_pass_cbr(cpi);
1611 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1612 // should be done here, before the frame qp is selected.
1613 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1614 vp9_cyclic_refresh_update_parameters(cpi);
1616 vp9_rc_set_frame_target(cpi, target);
1617 rc->frames_till_gf_update_due = INT_MAX;
1618 rc->baseline_gf_interval = INT_MAX;
1621 void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
1622 VP9_COMMON *const cm = &cpi->common;
1623 RATE_CONTROL *const rc = &cpi->rc;
1625 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1626 if ((cm->current_video_frame == 0 ||
1627 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1628 rc->frames_to_key == 0 ||
1629 (cpi->oxcf.auto_key && 0))) {
1630 cm->frame_type = KEY_FRAME;
1631 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1632 rc->frames_to_key == 0;
1633 rc->frames_to_key = cpi->oxcf.key_freq;
1634 rc->kf_boost = DEFAULT_KF_BOOST;
1635 rc->source_alt_ref_active = 0;
1637 cm->frame_type = INTER_FRAME;
1639 if (rc->frames_till_gf_update_due == 0) {
1640 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1641 vp9_cyclic_refresh_set_golden_update(cpi);
1643 rc->baseline_gf_interval =
1644 (rc->min_gf_interval + rc->max_gf_interval) / 2;
1645 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1646 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1647 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1648 rc->frames_till_gf_update_due = rc->frames_to_key;
1649 cpi->refresh_golden_frame = 1;
1650 rc->gfu_boost = DEFAULT_GF_BOOST;
1653 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1654 // should be done here, before the frame qp is selected.
1655 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1656 vp9_cyclic_refresh_update_parameters(cpi);
1658 if (cm->frame_type == KEY_FRAME)
1659 target = calc_iframe_target_size_one_pass_cbr(cpi);
1661 target = calc_pframe_target_size_one_pass_cbr(cpi);
1663 vp9_rc_set_frame_target(cpi, target);
1664 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
1665 cpi->resize_pending = vp9_resize_one_pass_cbr(cpi);
1667 cpi->resize_pending = 0;
1670 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
1671 vpx_bit_depth_t bit_depth) {
1672 int start_index = rc->worst_quality;
1673 int target_index = rc->worst_quality;
1676 // Convert the average q value to an index.
1677 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1679 if (vp9_convert_qindex_to_q(i, bit_depth) >= qstart)
1683 // Convert the q target to an index
1684 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1686 if (vp9_convert_qindex_to_q(i, bit_depth) >= qtarget)
1690 return target_index - start_index;
1693 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1694 int qindex, double rate_target_ratio,
1695 vpx_bit_depth_t bit_depth) {
1696 int target_index = rc->worst_quality;
1699 // Look up the current projected bits per block for the base index
1700 const int base_bits_per_mb = vp9_rc_bits_per_mb(frame_type, qindex, 1.0,
1703 // Find the target bits per mb based on the base value and given ratio.
1704 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1706 // Convert the q target to an index
1707 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1708 if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
1709 target_bits_per_mb) {
1714 return target_index - qindex;
1717 void vp9_rc_set_gf_interval_range(const VP9_COMP *const cpi,
1718 RATE_CONTROL *const rc) {
1719 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1721 // Set Maximum gf/arf interval
1722 rc->max_gf_interval = oxcf->max_gf_interval;
1723 rc->min_gf_interval = oxcf->min_gf_interval;
1724 if (rc->min_gf_interval == 0)
1725 rc->min_gf_interval = vp9_rc_get_default_min_gf_interval(
1726 oxcf->width, oxcf->height, cpi->framerate);
1727 if (rc->max_gf_interval == 0)
1728 rc->max_gf_interval = vp9_rc_get_default_max_gf_interval(
1729 cpi->framerate, rc->min_gf_interval);
1731 // Extended interval for genuinely static scenes
1732 rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;
1734 if (is_altref_enabled(cpi)) {
1735 if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
1736 rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
1739 if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
1740 rc->max_gf_interval = rc->static_scene_max_gf_interval;
1743 rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval);
1746 void vp9_rc_update_framerate(VP9_COMP *cpi) {
1747 const VP9_COMMON *const cm = &cpi->common;
1748 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1749 RATE_CONTROL *const rc = &cpi->rc;
1752 rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate);
1753 rc->min_frame_bandwidth = (int)(rc->avg_frame_bandwidth *
1754 oxcf->two_pass_vbrmin_section / 100);
1756 rc->min_frame_bandwidth =
1757 VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
1759 // A maximum bitrate for a frame is defined.
1760 // The baseline for this aligns with HW implementations that
1761 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
1762 // per 16x16 MB (averaged over a frame). However this limit is extended if
1763 // a very high rate is given on the command line or the the rate cannnot
1764 // be acheived because of a user specificed max q (e.g. when the user
1765 // specifies lossless encode.
1766 vbr_max_bits = (int)(((int64_t)rc->avg_frame_bandwidth *
1767 oxcf->two_pass_vbrmax_section) / 100);
1768 rc->max_frame_bandwidth =
1769 VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
1771 vp9_rc_set_gf_interval_range(cpi, rc);
1774 #define VBR_PCT_ADJUSTMENT_LIMIT 50
1775 // For VBR...adjustment to the frame target based on error from previous frames
1776 static void vbr_rate_correction(VP9_COMP *cpi, int *this_frame_target) {
1777 RATE_CONTROL *const rc = &cpi->rc;
1778 int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
1780 double position_factor = 1.0;
1782 // How far through the clip are we.
1783 // This number is used to damp the per frame rate correction.
1785 if (cpi->twopass.total_stats.count) {
1786 position_factor = sqrt((double)cpi->common.current_video_frame /
1787 cpi->twopass.total_stats.count);
1789 max_delta = (int)(position_factor *
1790 ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100));
1792 // vbr_bits_off_target > 0 means we have extra bits to spend
1793 if (vbr_bits_off_target > 0) {
1794 *this_frame_target +=
1795 (vbr_bits_off_target > max_delta) ? max_delta
1796 : (int)vbr_bits_off_target;
1798 *this_frame_target -=
1799 (vbr_bits_off_target < -max_delta) ? max_delta
1800 : (int)-vbr_bits_off_target;
1803 // Fast redistribution of bits arising from massive local undershoot.
1804 // Dont do it for kf,arf,gf or overlay frames.
1805 if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
1806 rc->vbr_bits_off_target_fast) {
1807 int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target);
1808 int fast_extra_bits;
1809 fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
1810 fast_extra_bits = (int)VPXMIN(
1812 VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
1813 *this_frame_target += (int)fast_extra_bits;
1814 rc->vbr_bits_off_target_fast -= fast_extra_bits;
1818 void vp9_set_target_rate(VP9_COMP *cpi) {
1819 RATE_CONTROL *const rc = &cpi->rc;
1820 int target_rate = rc->base_frame_target;
1822 if (cpi->common.frame_type == KEY_FRAME)
1823 target_rate = vp9_rc_clamp_iframe_target_size(cpi, target_rate);
1825 target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate);
1827 // Correction to rate target based on prior over or under shoot.
1828 if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
1829 vbr_rate_correction(cpi, &target_rate);
1830 vp9_rc_set_frame_target(cpi, target_rate);
1833 // Check if we should resize, based on average QP from past x frames.
1834 // Only allow for resize at most one scale down for now, scaling factor is 2.
1835 int vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
1836 const VP9_COMMON *const cm = &cpi->common;
1837 RATE_CONTROL *const rc = &cpi->rc;
1838 RESIZE_ACTION resize_action = NO_RESIZE;
1839 int avg_qp_thr1 = 70;
1840 int avg_qp_thr2 = 50;
1841 int min_width = 180;
1842 int min_height = 180;
1843 int down_size_on = 1;
1844 cpi->resize_scale_num = 1;
1845 cpi->resize_scale_den = 1;
1846 // Don't resize on key frame; reset the counters on key frame.
1847 if (cm->frame_type == KEY_FRAME) {
1848 cpi->resize_avg_qp = 0;
1849 cpi->resize_count = 0;
1852 // Check current frame reslution to avoid generating frames smaller than
1853 // the minimum resolution.
1854 if (ONEHALFONLY_RESIZE) {
1855 if ((cm->width >> 1) < min_width || (cm->height >> 1) < min_height)
1858 if (cpi->resize_state == ORIG &&
1859 (cm->width * 3 / 4 < min_width ||
1860 cm->height * 3 / 4 < min_height))
1862 else if (cpi->resize_state == THREE_QUARTER &&
1863 ((cpi->oxcf.width >> 1) < min_width ||
1864 (cpi->oxcf.height >> 1) < min_height))
1868 #if CONFIG_VP9_TEMPORAL_DENOISING
1869 // If denoiser is on, apply a smaller qp threshold.
1870 if (cpi->oxcf.noise_sensitivity > 0) {
1876 // Resize based on average buffer underflow and QP over some window.
1877 // Ignore samples close to key frame, since QP is usually high after key.
1878 if (cpi->rc.frames_since_key > 2 * cpi->framerate) {
1879 const int window = (int)(4 * cpi->framerate);
1880 cpi->resize_avg_qp += cm->base_qindex;
1881 if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
1882 ++cpi->resize_buffer_underflow;
1883 ++cpi->resize_count;
1884 // Check for resize action every "window" frames.
1885 if (cpi->resize_count >= window) {
1886 int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
1887 // Resize down if buffer level has underflowed sufficient amount in past
1888 // window, and we are at original or 3/4 of original resolution.
1889 // Resize back up if average QP is low, and we are currently in a resized
1890 // down state, i.e. 1/2 or 3/4 of original resolution.
1891 // Currently, use a flag to turn 3/4 resizing feature on/off.
1892 if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
1893 if (cpi->resize_state == THREE_QUARTER && down_size_on) {
1894 resize_action = DOWN_ONEHALF;
1895 cpi->resize_state = ONE_HALF;
1896 } else if (cpi->resize_state == ORIG) {
1897 resize_action = ONEHALFONLY_RESIZE ? DOWN_ONEHALF : DOWN_THREEFOUR;
1898 cpi->resize_state = ONEHALFONLY_RESIZE ? ONE_HALF : THREE_QUARTER;
1900 } else if (cpi->resize_state != ORIG &&
1901 avg_qp < avg_qp_thr1 * cpi->rc.worst_quality / 100) {
1902 if (cpi->resize_state == THREE_QUARTER ||
1903 avg_qp < avg_qp_thr2 * cpi->rc.worst_quality / 100 ||
1904 ONEHALFONLY_RESIZE) {
1905 resize_action = UP_ORIG;
1906 cpi->resize_state = ORIG;
1907 } else if (cpi->resize_state == ONE_HALF) {
1908 resize_action = UP_THREEFOUR;
1909 cpi->resize_state = THREE_QUARTER;
1912 // Reset for next window measurement.
1913 cpi->resize_avg_qp = 0;
1914 cpi->resize_count = 0;
1915 cpi->resize_buffer_underflow = 0;
1918 // If decision is to resize, reset some quantities, and check is we should
1919 // reduce rate correction factor,
1920 if (resize_action != NO_RESIZE) {
1921 int target_bits_per_frame;
1922 int active_worst_quality;
1924 int tot_scale_change;
1925 if (resize_action == DOWN_THREEFOUR || resize_action == UP_THREEFOUR) {
1926 cpi->resize_scale_num = 3;
1927 cpi->resize_scale_den = 4;
1928 } else if (resize_action == DOWN_ONEHALF) {
1929 cpi->resize_scale_num = 1;
1930 cpi->resize_scale_den = 2;
1931 } else { // UP_ORIG or anything else
1932 cpi->resize_scale_num = 1;
1933 cpi->resize_scale_den = 1;
1935 tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
1936 (cpi->resize_scale_num * cpi->resize_scale_num);
1937 // Reset buffer level to optimal, update target size.
1938 rc->buffer_level = rc->optimal_buffer_level;
1939 rc->bits_off_target = rc->optimal_buffer_level;
1940 rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
1941 // Get the projected qindex, based on the scaled target frame size (scaled
1942 // so target_bits_per_mb in vp9_rc_regulate_q will be correct target).
1943 target_bits_per_frame = (resize_action >= 0) ?
1944 rc->this_frame_target * tot_scale_change :
1945 rc->this_frame_target / tot_scale_change;
1946 active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
1947 qindex = vp9_rc_regulate_q(cpi,
1948 target_bits_per_frame,
1950 active_worst_quality);
1951 // If resize is down, check if projected q index is close to worst_quality,
1952 // and if so, reduce the rate correction factor (since likely can afford
1953 // lower q for resized frame).
1954 if (resize_action > 0 &&
1955 qindex > 90 * cpi->rc.worst_quality / 100) {
1956 rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
1958 // If resize is back up, check if projected q index is too much above the
1959 // current base_qindex, and if so, reduce the rate correction factor
1960 // (since prefer to keep q for resized frame at least close to previous q).
1961 if (resize_action < 0 &&
1962 qindex > 130 * cm->base_qindex / 100) {
1963 rc->rate_correction_factors[INTER_NORMAL] *= 0.9;
1966 return resize_action;
1969 // Compute average source sad (temporal sad: between current source and
1970 // previous source) over a subset of superblocks. Use this is detect big changes
1971 // in content and allow rate control to react.
1972 // TODO(marpan): Superblock sad is computed again in variance partition for
1973 // non-rd mode (but based on last reconstructed frame). Should try to reuse
1974 // these computations.
1975 void vp9_avg_source_sad(VP9_COMP *cpi) {
1976 VP9_COMMON * const cm = &cpi->common;
1977 RATE_CONTROL *const rc = &cpi->rc;
1978 rc->high_source_sad = 0;
1979 if (cpi->Last_Source != NULL) {
1980 const uint8_t *src_y = cpi->Source->y_buffer;
1981 const int src_ystride = cpi->Source->y_stride;
1982 const uint8_t *last_src_y = cpi->Last_Source->y_buffer;
1983 const int last_src_ystride = cpi->Last_Source->y_stride;
1984 int sbi_row, sbi_col;
1985 const BLOCK_SIZE bsize = BLOCK_64X64;
1986 // Loop over sub-sample of frame, and compute average sad over 64x64 blocks.
1987 uint64_t avg_sad = 0;
1988 int num_samples = 0;
1989 int sb_cols = (cm->mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
1990 int sb_rows = (cm->mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
1991 for (sbi_row = 0; sbi_row < sb_rows; sbi_row ++) {
1992 for (sbi_col = 0; sbi_col < sb_cols; sbi_col ++) {
1993 // Checker-board pattern, ignore boundary.
1994 if ((sbi_row > 0 && sbi_col > 0) &&
1995 (sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) &&
1996 ((sbi_row % 2 == 0 && sbi_col % 2 == 0) ||
1997 (sbi_row % 2 != 0 && sbi_col % 2 != 0))) {
1999 avg_sad += cpi->fn_ptr[bsize].sdf(src_y,
2007 src_y += (src_ystride << 6) - (sb_cols << 6);
2008 last_src_y += (last_src_ystride << 6) - (sb_cols << 6);
2010 if (num_samples > 0)
2011 avg_sad = avg_sad / num_samples;
2012 // Set high_source_sad flag if we detect very high increase in avg_sad
2013 // between current and the previous frame value(s). Use a minimum threshold
2014 // for cases where there is small change from content that is completely
2016 if (avg_sad > VPXMAX(4000, (rc->avg_source_sad << 3)) &&
2017 rc->frames_since_key > 1)
2018 rc->high_source_sad = 1;
2020 rc->high_source_sad = 0;
2021 rc->avg_source_sad = (rc->avg_source_sad + avg_sad) >> 1;
2025 // Test if encoded frame will significantly overshoot the target bitrate, and
2026 // if so, set the QP, reset/adjust some rate control parameters, and return 1.
2027 int vp9_encodedframe_overshoot(VP9_COMP *cpi,
2030 VP9_COMMON * const cm = &cpi->common;
2031 RATE_CONTROL *const rc = &cpi->rc;
2032 int thresh_qp = 3 * (rc->worst_quality >> 2);
2033 int thresh_rate = rc->avg_frame_bandwidth * 10;
2034 if (cm->base_qindex < thresh_qp &&
2035 frame_size > thresh_rate) {
2036 double rate_correction_factor =
2037 cpi->rc.rate_correction_factors[INTER_NORMAL];
2038 const int target_size = cpi->rc.avg_frame_bandwidth;
2039 double new_correction_factor;
2040 int target_bits_per_mb;
2043 // Force a re-encode, and for now use max-QP.
2044 *q = cpi->rc.worst_quality;
2045 // Adjust avg_frame_qindex, buffer_level, and rate correction factors, as
2046 // these parameters will affect QP selection for subsequent frames. If they
2047 // have settled down to a very different (low QP) state, then not adjusting
2048 // them may cause next frame to select low QP and overshoot again.
2049 cpi->rc.avg_frame_qindex[INTER_FRAME] = *q;
2050 rc->buffer_level = rc->optimal_buffer_level;
2051 rc->bits_off_target = rc->optimal_buffer_level;
2052 // Reset rate under/over-shoot flags.
2053 cpi->rc.rc_1_frame = 0;
2054 cpi->rc.rc_2_frame = 0;
2055 // Adjust rate correction factor.
2056 target_bits_per_mb = ((uint64_t)target_size << BPER_MB_NORMBITS) / cm->MBs;
2057 // Rate correction factor based on target_bits_per_mb and qp (==max_QP).
2058 // This comes from the inverse computation of vp9_rc_bits_per_mb().
2059 q2 = vp9_convert_qindex_to_q(*q, cm->bit_depth);
2060 enumerator = 1800000; // Factor for inter frame.
2061 enumerator += (int)(enumerator * q2) >> 12;
2062 new_correction_factor = (double)target_bits_per_mb * q2 / enumerator;
2063 if (new_correction_factor > rate_correction_factor) {
2064 rate_correction_factor =
2065 VPXMIN(2.0 * rate_correction_factor, new_correction_factor);
2066 if (rate_correction_factor > MAX_BPB_FACTOR)
2067 rate_correction_factor = MAX_BPB_FACTOR;
2068 cpi->rc.rate_correction_factors[INTER_NORMAL] = rate_correction_factor;
2070 // For temporal layers, reset the rate control parametes across all
2074 SVC *svc = &cpi->svc;
2075 for (i = 0; i < svc->number_temporal_layers; ++i) {
2076 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i,
2077 svc->number_temporal_layers);
2078 LAYER_CONTEXT *lc = &svc->layer_context[layer];
2079 RATE_CONTROL *lrc = &lc->rc;
2080 lrc->avg_frame_qindex[INTER_FRAME] = *q;
2081 lrc->buffer_level = rc->optimal_buffer_level;
2082 lrc->bits_off_target = rc->optimal_buffer_level;
2083 lrc->rc_1_frame = 0;
2084 lrc->rc_2_frame = 0;
2085 lrc->rate_correction_factors[INTER_NORMAL] =
2086 rate_correction_factor;