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);
274 rc->buffer_level = rc->bits_off_target;
276 if (is_one_pass_cbr_svc(cpi)) {
277 update_layer_buffer_level(&cpi->svc, encoded_frame_size);
281 int vp9_rc_get_default_min_gf_interval(
282 int width, int height, double framerate) {
283 // Assume we do not need any constraint lower than 4K 20 fps
284 static const double factor_safe = 3840 * 2160 * 20.0;
285 const double factor = width * height * framerate;
286 const int default_interval =
287 clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL);
289 if (factor <= factor_safe)
290 return default_interval;
292 return VPXMAX(default_interval,
293 (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
294 // Note this logic makes:
300 int vp9_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) {
301 int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75));
302 interval += (interval & 0x01); // Round to even value
303 return VPXMAX(interval, min_gf_interval);
306 void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
309 if (pass == 0 && oxcf->rc_mode == VPX_CBR) {
310 rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
311 rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
313 rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q +
314 oxcf->best_allowed_q) / 2;
315 rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
316 oxcf->best_allowed_q) / 2;
319 rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
320 rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
322 rc->buffer_level = rc->starting_buffer_level;
323 rc->bits_off_target = rc->starting_buffer_level;
325 rc->rolling_target_bits = rc->avg_frame_bandwidth;
326 rc->rolling_actual_bits = rc->avg_frame_bandwidth;
327 rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
328 rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
330 rc->total_actual_bits = 0;
331 rc->total_target_bits = 0;
332 rc->total_target_vs_actual = 0;
334 rc->frames_since_key = 8; // Sensible default for first frame.
335 rc->this_key_frame_forced = 0;
336 rc->next_key_frame_forced = 0;
337 rc->source_alt_ref_pending = 0;
338 rc->source_alt_ref_active = 0;
340 rc->frames_till_gf_update_due = 0;
341 rc->ni_av_qi = oxcf->worst_allowed_q;
346 rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
348 for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
349 rc->rate_correction_factors[i] = 1.0;
352 rc->min_gf_interval = oxcf->min_gf_interval;
353 rc->max_gf_interval = oxcf->max_gf_interval;
354 if (rc->min_gf_interval == 0)
355 rc->min_gf_interval = vp9_rc_get_default_min_gf_interval(
356 oxcf->width, oxcf->height, oxcf->init_framerate);
357 if (rc->max_gf_interval == 0)
358 rc->max_gf_interval = vp9_rc_get_default_max_gf_interval(
359 oxcf->init_framerate, rc->min_gf_interval);
360 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
363 int vp9_rc_drop_frame(VP9_COMP *cpi) {
364 const VP9EncoderConfig *oxcf = &cpi->oxcf;
365 RATE_CONTROL *const rc = &cpi->rc;
367 if (!oxcf->drop_frames_water_mark) {
370 if (rc->buffer_level < 0) {
371 // Always drop if buffer is below 0.
374 // If buffer is below drop_mark, for now just drop every other frame
375 // (starting with the next frame) until it increases back over drop_mark.
376 int drop_mark = (int)(oxcf->drop_frames_water_mark *
377 rc->optimal_buffer_level / 100);
378 if ((rc->buffer_level > drop_mark) &&
379 (rc->decimation_factor > 0)) {
380 --rc->decimation_factor;
381 } else if (rc->buffer_level <= drop_mark &&
382 rc->decimation_factor == 0) {
383 rc->decimation_factor = 1;
385 if (rc->decimation_factor > 0) {
386 if (rc->decimation_count > 0) {
387 --rc->decimation_count;
390 rc->decimation_count = rc->decimation_factor;
394 rc->decimation_count = 0;
401 static double get_rate_correction_factor(const VP9_COMP *cpi) {
402 const RATE_CONTROL *const rc = &cpi->rc;
405 if (cpi->common.frame_type == KEY_FRAME) {
406 rcf = rc->rate_correction_factors[KF_STD];
407 } else if (cpi->oxcf.pass == 2) {
408 RATE_FACTOR_LEVEL rf_lvl =
409 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
410 rcf = rc->rate_correction_factors[rf_lvl];
412 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
413 !rc->is_src_frame_alt_ref && !cpi->use_svc &&
414 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
415 rcf = rc->rate_correction_factors[GF_ARF_STD];
417 rcf = rc->rate_correction_factors[INTER_NORMAL];
419 rcf *= rcf_mult[rc->frame_size_selector];
420 return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
423 static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
424 RATE_CONTROL *const rc = &cpi->rc;
426 // Normalize RCF to account for the size-dependent scaling factor.
427 factor /= rcf_mult[cpi->rc.frame_size_selector];
429 factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
431 if (cpi->common.frame_type == KEY_FRAME) {
432 rc->rate_correction_factors[KF_STD] = factor;
433 } else if (cpi->oxcf.pass == 2) {
434 RATE_FACTOR_LEVEL rf_lvl =
435 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
436 rc->rate_correction_factors[rf_lvl] = factor;
438 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
439 !rc->is_src_frame_alt_ref && !cpi->use_svc &&
440 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
441 rc->rate_correction_factors[GF_ARF_STD] = factor;
443 rc->rate_correction_factors[INTER_NORMAL] = factor;
447 void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) {
448 const VP9_COMMON *const cm = &cpi->common;
449 int correction_factor = 100;
450 double rate_correction_factor = get_rate_correction_factor(cpi);
451 double adjustment_limit;
453 int projected_size_based_on_q = 0;
455 // Do not update the rate factors for arf overlay frames.
456 if (cpi->rc.is_src_frame_alt_ref)
459 // Clear down mmx registers to allow floating point in what follows
460 vpx_clear_system_state();
462 // Work out how big we would have expected the frame to be at this Q given
463 // the current correction factor.
464 // Stay in double to avoid int overflow when values are large
465 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) {
466 projected_size_based_on_q =
467 vp9_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
469 projected_size_based_on_q = vp9_estimate_bits_at_q(cpi->common.frame_type,
472 rate_correction_factor,
475 // Work out a size correction factor.
476 if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
477 correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) /
478 projected_size_based_on_q);
480 // More heavily damped adjustment used if we have been oscillating either side
482 adjustment_limit = 0.25 +
483 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor)));
485 cpi->rc.q_2_frame = cpi->rc.q_1_frame;
486 cpi->rc.q_1_frame = cm->base_qindex;
487 cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
488 if (correction_factor > 110)
489 cpi->rc.rc_1_frame = -1;
490 else if (correction_factor < 90)
491 cpi->rc.rc_1_frame = 1;
493 cpi->rc.rc_1_frame = 0;
495 if (correction_factor > 102) {
496 // We are not already at the worst allowable quality
497 correction_factor = (int)(100 + ((correction_factor - 100) *
499 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
500 // Keep rate_correction_factor within limits
501 if (rate_correction_factor > MAX_BPB_FACTOR)
502 rate_correction_factor = MAX_BPB_FACTOR;
503 } else if (correction_factor < 99) {
504 // We are not already at the best allowable quality
505 correction_factor = (int)(100 - ((100 - correction_factor) *
507 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
509 // Keep rate_correction_factor within limits
510 if (rate_correction_factor < MIN_BPB_FACTOR)
511 rate_correction_factor = MIN_BPB_FACTOR;
514 set_rate_correction_factor(cpi, rate_correction_factor);
518 int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
519 int active_best_quality, int active_worst_quality) {
520 const VP9_COMMON *const cm = &cpi->common;
521 int q = active_worst_quality;
522 int last_error = INT_MAX;
523 int i, target_bits_per_mb, bits_per_mb_at_this_q;
524 const double correction_factor = get_rate_correction_factor(cpi);
526 // Calculate required scaling factor based on target frame size and size of
527 // frame produced using previous Q.
529 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
531 i = active_best_quality;
534 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ &&
536 cpi->svc.temporal_layer_id == 0) {
537 bits_per_mb_at_this_q =
538 (int)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
540 bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cm->frame_type, i,
545 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
546 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
553 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
555 } while (++i <= active_worst_quality);
557 // In CBR mode, this makes sure q is between oscillating Qs to prevent
559 if (cpi->oxcf.rc_mode == VPX_CBR &&
560 (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
561 cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
562 q = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
563 VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
568 static int get_active_quality(int q, int gfu_boost, int low, int high,
569 int *low_motion_minq, int *high_motion_minq) {
570 if (gfu_boost > high) {
571 return low_motion_minq[q];
572 } else if (gfu_boost < low) {
573 return high_motion_minq[q];
575 const int gap = high - low;
576 const int offset = high - gfu_boost;
577 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
578 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
579 return low_motion_minq[q] + adjustment;
583 static int get_kf_active_quality(const RATE_CONTROL *const rc, int q,
584 vpx_bit_depth_t bit_depth) {
585 int *kf_low_motion_minq;
586 int *kf_high_motion_minq;
587 ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq);
588 ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq);
589 return get_active_quality(q, rc->kf_boost, kf_low, kf_high,
590 kf_low_motion_minq, kf_high_motion_minq);
593 static int get_gf_active_quality(const RATE_CONTROL *const rc, int q,
594 vpx_bit_depth_t bit_depth) {
595 int *arfgf_low_motion_minq;
596 int *arfgf_high_motion_minq;
597 ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq);
598 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
599 return get_active_quality(q, rc->gfu_boost, gf_low, gf_high,
600 arfgf_low_motion_minq, arfgf_high_motion_minq);
603 static int calc_active_worst_quality_one_pass_vbr(const VP9_COMP *cpi) {
604 const RATE_CONTROL *const rc = &cpi->rc;
605 const unsigned int curr_frame = cpi->common.current_video_frame;
606 int active_worst_quality;
608 if (cpi->common.frame_type == KEY_FRAME) {
609 active_worst_quality = curr_frame == 0 ? rc->worst_quality
610 : rc->last_q[KEY_FRAME] * 2;
612 if (!rc->is_src_frame_alt_ref &&
613 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
614 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
615 : rc->last_q[INTER_FRAME];
617 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
618 : rc->last_q[INTER_FRAME] * 2;
621 return VPXMIN(active_worst_quality, rc->worst_quality);
624 // Adjust active_worst_quality level based on buffer level.
625 static int calc_active_worst_quality_one_pass_cbr(const VP9_COMP *cpi) {
626 // Adjust active_worst_quality: If buffer is above the optimal/target level,
627 // bring active_worst_quality down depending on fullness of buffer.
628 // If buffer is below the optimal level, let the active_worst_quality go from
629 // ambient Q (at buffer = optimal level) to worst_quality level
630 // (at buffer = critical level).
631 const VP9_COMMON *const cm = &cpi->common;
632 const RATE_CONTROL *rc = &cpi->rc;
633 // Buffer level below which we push active_worst to worst_quality.
634 int64_t critical_level = rc->optimal_buffer_level >> 3;
635 int64_t buff_lvl_step = 0;
637 int active_worst_quality;
639 unsigned int num_frames_weight_key = 5 * cpi->svc.number_temporal_layers;
640 if (cm->frame_type == KEY_FRAME)
641 return rc->worst_quality;
642 // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME]
643 // for the first few frames following key frame. These are both initialized
644 // to worst_quality and updated with (3/4, 1/4) average in postencode_update.
645 // So for first few frames following key, the qp of that key frame is weighted
646 // into the active_worst_quality setting.
647 ambient_qp = (cm->current_video_frame < num_frames_weight_key) ?
648 VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
649 rc->avg_frame_qindex[KEY_FRAME]) :
650 rc->avg_frame_qindex[INTER_FRAME];
651 active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4);
652 if (rc->buffer_level > rc->optimal_buffer_level) {
654 // Maximum limit for down adjustment, ~30%.
655 int max_adjustment_down = active_worst_quality / 3;
656 if (max_adjustment_down) {
657 buff_lvl_step = ((rc->maximum_buffer_size -
658 rc->optimal_buffer_level) / max_adjustment_down);
660 adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) /
662 active_worst_quality -= adjustment;
664 } else if (rc->buffer_level > critical_level) {
665 // Adjust up from ambient Q.
666 if (critical_level) {
667 buff_lvl_step = (rc->optimal_buffer_level - critical_level);
669 adjustment = (int)((rc->worst_quality - ambient_qp) *
670 (rc->optimal_buffer_level - rc->buffer_level) /
673 active_worst_quality = ambient_qp + adjustment;
676 // Set to worst_quality if buffer is below critical level.
677 active_worst_quality = rc->worst_quality;
679 return active_worst_quality;
682 static int rc_pick_q_and_bounds_one_pass_cbr(const VP9_COMP *cpi,
685 const VP9_COMMON *const cm = &cpi->common;
686 const RATE_CONTROL *const rc = &cpi->rc;
687 int active_best_quality;
688 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
691 ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq);
693 if (frame_is_intra_only(cm)) {
694 active_best_quality = rc->best_quality;
695 // Handle the special case for key frames forced when we have reached
696 // the maximum key frame interval. Here force the Q to a range
697 // based on the ambient Q to reduce the risk of popping.
698 if (rc->this_key_frame_forced) {
699 int qindex = rc->last_boosted_qindex;
700 double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
701 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
702 (last_boosted_q * 0.75),
704 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
705 } else if (cm->current_video_frame > 0) {
706 // not first frame of one pass and kf_boost is set
707 double q_adj_factor = 1.0;
710 active_best_quality =
711 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
714 // Allow somewhat lower kf minq with small image formats.
715 if ((cm->width * cm->height) <= (352 * 288)) {
716 q_adj_factor -= 0.25;
719 // Convert the adjustment factor to a qindex delta
720 // on active_best_quality.
721 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
722 active_best_quality += vp9_compute_qdelta(rc, q_val,
723 q_val * q_adj_factor,
726 } else if (!rc->is_src_frame_alt_ref &&
728 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
729 // Use the lower of active_worst_quality and recent
730 // average Q as basis for GF/ARF best Q limit unless last frame was
732 if (rc->frames_since_key > 1 &&
733 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
734 q = rc->avg_frame_qindex[INTER_FRAME];
736 q = active_worst_quality;
738 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
740 // Use the lower of active_worst_quality and recent/average Q.
741 if (cm->current_video_frame > 1) {
742 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
743 active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]];
745 active_best_quality = rtc_minq[active_worst_quality];
747 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
748 active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]];
750 active_best_quality = rtc_minq[active_worst_quality];
754 // Clip the active best and worst quality values to limits
755 active_best_quality = clamp(active_best_quality,
756 rc->best_quality, rc->worst_quality);
757 active_worst_quality = clamp(active_worst_quality,
758 active_best_quality, rc->worst_quality);
760 *top_index = active_worst_quality;
761 *bottom_index = active_best_quality;
763 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
764 // Limit Q range for the adaptive loop.
765 if (cm->frame_type == KEY_FRAME &&
766 !rc->this_key_frame_forced &&
767 !(cm->current_video_frame == 0)) {
769 vpx_clear_system_state();
770 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
771 active_worst_quality, 2.0,
773 *top_index = active_worst_quality + qdelta;
774 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
778 // Special case code to try and match quality with forced key frames
779 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
780 q = rc->last_boosted_qindex;
782 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
783 active_best_quality, active_worst_quality);
784 if (q > *top_index) {
785 // Special case when we are targeting the max allowed rate
786 if (rc->this_frame_target >= rc->max_frame_bandwidth)
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 get_active_cq_level(const RATE_CONTROL *rc,
801 const VP9EncoderConfig *const oxcf) {
802 static const double cq_adjust_threshold = 0.1;
803 int active_cq_level = oxcf->cq_level;
804 if (oxcf->rc_mode == VPX_CQ &&
805 rc->total_target_bits > 0) {
806 const double x = (double)rc->total_actual_bits / rc->total_target_bits;
807 if (x < cq_adjust_threshold) {
808 active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold);
811 return active_cq_level;
814 static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
817 const VP9_COMMON *const cm = &cpi->common;
818 const RATE_CONTROL *const rc = &cpi->rc;
819 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
820 const int cq_level = get_active_cq_level(rc, oxcf);
821 int active_best_quality;
822 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
825 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
827 if (frame_is_intra_only(cm)) {
828 // Handle the special case for key frames forced when we have reached
829 // the maximum key frame interval. Here force the Q to a range
830 // based on the ambient Q to reduce the risk of popping.
831 if (rc->this_key_frame_forced) {
832 int qindex = rc->last_boosted_qindex;
833 double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
834 int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
835 last_boosted_q * 0.75,
837 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
839 // not first frame of one pass and kf_boost is set
840 double q_adj_factor = 1.0;
843 active_best_quality =
844 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
847 // Allow somewhat lower kf minq with small image formats.
848 if ((cm->width * cm->height) <= (352 * 288)) {
849 q_adj_factor -= 0.25;
852 // Convert the adjustment factor to a qindex delta
853 // on active_best_quality.
854 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
855 active_best_quality += vp9_compute_qdelta(rc, q_val,
856 q_val * q_adj_factor,
859 } else if (!rc->is_src_frame_alt_ref &&
860 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
861 // Use the lower of active_worst_quality and recent
862 // average Q as basis for GF/ARF best Q limit unless last frame was
864 if (rc->frames_since_key > 1 &&
865 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
866 q = rc->avg_frame_qindex[INTER_FRAME];
868 q = rc->avg_frame_qindex[KEY_FRAME];
870 // For constrained quality dont allow Q less than the cq level
871 if (oxcf->rc_mode == VPX_CQ) {
875 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
877 // Constrained quality use slightly lower active best.
878 active_best_quality = active_best_quality * 15 / 16;
880 } else if (oxcf->rc_mode == VPX_Q) {
881 if (!cpi->refresh_alt_ref_frame) {
882 active_best_quality = cq_level;
884 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
887 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
890 if (oxcf->rc_mode == VPX_Q) {
891 active_best_quality = cq_level;
893 // Use the lower of active_worst_quality and recent/average Q.
894 if (cm->current_video_frame > 1)
895 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
897 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
898 // For the constrained quality mode we don't want
899 // q to fall below the cq level.
900 if ((oxcf->rc_mode == VPX_CQ) &&
901 (active_best_quality < cq_level)) {
902 active_best_quality = cq_level;
907 // Clip the active best and worst quality values to limits
908 active_best_quality = clamp(active_best_quality,
909 rc->best_quality, rc->worst_quality);
910 active_worst_quality = clamp(active_worst_quality,
911 active_best_quality, rc->worst_quality);
913 *top_index = active_worst_quality;
914 *bottom_index = active_best_quality;
916 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
919 vpx_clear_system_state();
921 // Limit Q range for the adaptive loop.
922 if (cm->frame_type == KEY_FRAME &&
923 !rc->this_key_frame_forced &&
924 !(cm->current_video_frame == 0)) {
925 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
926 active_worst_quality, 2.0,
928 } else if (!rc->is_src_frame_alt_ref &&
929 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
930 qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
931 active_worst_quality, 1.75,
934 *top_index = active_worst_quality + qdelta;
935 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
939 if (oxcf->rc_mode == VPX_Q) {
940 q = active_best_quality;
941 // Special case code to try and match quality with forced key frames
942 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
943 q = rc->last_boosted_qindex;
945 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
946 active_best_quality, active_worst_quality);
947 if (q > *top_index) {
948 // Special case when we are targeting the max allowed rate
949 if (rc->this_frame_target >= rc->max_frame_bandwidth)
956 assert(*top_index <= rc->worst_quality &&
957 *top_index >= rc->best_quality);
958 assert(*bottom_index <= rc->worst_quality &&
959 *bottom_index >= rc->best_quality);
960 assert(q <= rc->worst_quality && q >= rc->best_quality);
964 int vp9_frame_type_qdelta(const VP9_COMP *cpi, int rf_level, int q) {
965 static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
966 1.00, // INTER_NORMAL
972 static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] =
973 {INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME};
974 const VP9_COMMON *const cm = &cpi->common;
975 int qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level],
976 q, rate_factor_deltas[rf_level],
981 #define STATIC_MOTION_THRESH 95
982 static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
985 const VP9_COMMON *const cm = &cpi->common;
986 const RATE_CONTROL *const rc = &cpi->rc;
987 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
988 const GF_GROUP *gf_group = &cpi->twopass.gf_group;
989 const int cq_level = get_active_cq_level(rc, oxcf);
990 int active_best_quality;
991 int active_worst_quality = cpi->twopass.active_worst_quality;
994 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
996 if (frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi)) {
997 // Handle the special case for key frames forced when we have reached
998 // the maximum key frame interval. Here force the Q to a range
999 // based on the ambient Q to reduce the risk of popping.
1000 if (rc->this_key_frame_forced) {
1001 double last_boosted_q;
1005 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1006 qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1007 active_best_quality = qindex;
1008 last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
1009 delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
1010 last_boosted_q * 1.25,
1012 active_worst_quality =
1013 VPXMIN(qindex + delta_qindex, active_worst_quality);
1015 qindex = rc->last_boosted_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 * 0.75,
1020 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
1023 // Not forced keyframe.
1024 double q_adj_factor = 1.0;
1026 // Baseline value derived from cpi->active_worst_quality and kf boost.
1027 active_best_quality = get_kf_active_quality(rc, active_worst_quality,
1030 // Allow somewhat lower kf minq with small image formats.
1031 if ((cm->width * cm->height) <= (352 * 288)) {
1032 q_adj_factor -= 0.25;
1035 // Make a further adjustment based on the kf zero motion measure.
1036 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
1038 // Convert the adjustment factor to a qindex delta
1039 // on active_best_quality.
1040 q_val = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
1041 active_best_quality += vp9_compute_qdelta(rc, q_val,
1042 q_val * q_adj_factor,
1045 } else if (!rc->is_src_frame_alt_ref &&
1046 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1047 // Use the lower of active_worst_quality and recent
1048 // average Q as basis for GF/ARF best Q limit unless last frame was
1050 if (rc->frames_since_key > 1 &&
1051 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
1052 q = rc->avg_frame_qindex[INTER_FRAME];
1054 q = active_worst_quality;
1056 // For constrained quality dont allow Q less than the cq level
1057 if (oxcf->rc_mode == VPX_CQ) {
1061 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1063 // Constrained quality use slightly lower active best.
1064 active_best_quality = active_best_quality * 15 / 16;
1066 } else if (oxcf->rc_mode == VPX_Q) {
1067 if (!cpi->refresh_alt_ref_frame) {
1068 active_best_quality = cq_level;
1070 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1072 // Modify best quality for second level arfs. For mode VPX_Q this
1073 // becomes the baseline frame q.
1074 if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
1075 active_best_quality = (active_best_quality + cq_level + 1) / 2;
1078 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1081 if (oxcf->rc_mode == VPX_Q) {
1082 active_best_quality = cq_level;
1084 active_best_quality = inter_minq[active_worst_quality];
1086 // For the constrained quality mode we don't want
1087 // q to fall below the cq level.
1088 if ((oxcf->rc_mode == VPX_CQ) &&
1089 (active_best_quality < cq_level)) {
1090 active_best_quality = cq_level;
1095 // Extension to max or min Q if undershoot or overshoot is outside
1096 // the permitted range.
1097 if ((cpi->oxcf.rc_mode != VPX_Q) &&
1098 (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) {
1099 if (frame_is_intra_only(cm) ||
1100 (!rc->is_src_frame_alt_ref &&
1101 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
1102 active_best_quality -=
1103 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
1104 active_worst_quality += (cpi->twopass.extend_maxq / 2);
1106 active_best_quality -=
1107 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
1108 active_worst_quality += cpi->twopass.extend_maxq;
1112 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
1113 vpx_clear_system_state();
1114 // Static forced key frames Q restrictions dealt with elsewhere.
1115 if (!((frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi))) ||
1116 !rc->this_key_frame_forced ||
1117 (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
1118 int qdelta = vp9_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
1119 active_worst_quality);
1120 active_worst_quality = VPXMAX(active_worst_quality + qdelta,
1121 active_best_quality);
1125 // Modify active_best_quality for downscaled normal frames.
1126 if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
1127 int qdelta = vp9_compute_qdelta_by_rate(rc, cm->frame_type,
1128 active_best_quality, 2.0,
1130 active_best_quality =
1131 VPXMAX(active_best_quality + qdelta, rc->best_quality);
1134 active_best_quality = clamp(active_best_quality,
1135 rc->best_quality, rc->worst_quality);
1136 active_worst_quality = clamp(active_worst_quality,
1137 active_best_quality, rc->worst_quality);
1139 if (oxcf->rc_mode == VPX_Q) {
1140 q = active_best_quality;
1141 // Special case code to try and match quality with forced key frames.
1142 } else if ((frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi)) &&
1143 rc->this_key_frame_forced) {
1144 // If static since last kf use better of last boosted and last kf q.
1145 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1146 q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1148 q = rc->last_boosted_qindex;
1151 q = vp9_rc_regulate_q(cpi, rc->this_frame_target,
1152 active_best_quality, active_worst_quality);
1153 if (q > active_worst_quality) {
1154 // Special case when we are targeting the max allowed rate.
1155 if (rc->this_frame_target >= rc->max_frame_bandwidth)
1156 active_worst_quality = q;
1158 q = active_worst_quality;
1161 clamp(q, active_best_quality, active_worst_quality);
1163 *top_index = active_worst_quality;
1164 *bottom_index = active_best_quality;
1166 assert(*top_index <= rc->worst_quality &&
1167 *top_index >= rc->best_quality);
1168 assert(*bottom_index <= rc->worst_quality &&
1169 *bottom_index >= rc->best_quality);
1170 assert(q <= rc->worst_quality && q >= rc->best_quality);
1174 int vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi,
1175 int *bottom_index, int *top_index) {
1177 if (cpi->oxcf.pass == 0) {
1178 if (cpi->oxcf.rc_mode == VPX_CBR)
1179 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
1181 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
1183 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
1185 if (cpi->sf.use_nonrd_pick_mode) {
1186 if (cpi->sf.force_frame_boost == 1)
1187 q -= cpi->sf.max_delta_qindex;
1189 if (q < *bottom_index)
1191 else if (q > *top_index)
1197 void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
1199 int *frame_under_shoot_limit,
1200 int *frame_over_shoot_limit) {
1201 if (cpi->oxcf.rc_mode == VPX_Q) {
1202 *frame_under_shoot_limit = 0;
1203 *frame_over_shoot_limit = INT_MAX;
1205 // For very small rate targets where the fractional adjustment
1206 // may be tiny make sure there is at least a minimum range.
1207 const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100;
1208 *frame_under_shoot_limit = VPXMAX(frame_target - tolerance - 200, 0);
1209 *frame_over_shoot_limit = VPXMIN(frame_target + tolerance + 200,
1210 cpi->rc.max_frame_bandwidth);
1214 void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
1215 const VP9_COMMON *const cm = &cpi->common;
1216 RATE_CONTROL *const rc = &cpi->rc;
1218 rc->this_frame_target = target;
1220 // Modify frame size target when down-scaling.
1221 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
1222 rc->frame_size_selector != UNSCALED)
1223 rc->this_frame_target = (int)(rc->this_frame_target
1224 * rate_thresh_mult[rc->frame_size_selector]);
1226 // Target rate per SB64 (including partial SB64s.
1227 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1228 (cm->width * cm->height);
1231 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
1232 // this frame refreshes means next frames don't unless specified by user
1233 RATE_CONTROL *const rc = &cpi->rc;
1234 rc->frames_since_golden = 0;
1236 // Mark the alt ref as done (setting to 0 means no further alt refs pending).
1237 rc->source_alt_ref_pending = 0;
1239 // Set the alternate reference frame active flag
1240 rc->source_alt_ref_active = 1;
1243 static void update_golden_frame_stats(VP9_COMP *cpi) {
1244 RATE_CONTROL *const rc = &cpi->rc;
1246 // Update the Golden frame usage counts.
1247 if (cpi->refresh_golden_frame) {
1248 // this frame refreshes means next frames don't unless specified by user
1249 rc->frames_since_golden = 0;
1251 // If we are not using alt ref in the up and coming group clear the arf
1253 if (!rc->source_alt_ref_pending) {
1254 rc->source_alt_ref_active = 0;
1257 // Decrement count down till next gf
1258 if (rc->frames_till_gf_update_due > 0)
1259 rc->frames_till_gf_update_due--;
1261 } else if (!cpi->refresh_alt_ref_frame) {
1262 // Decrement count down till next gf
1263 if (rc->frames_till_gf_update_due > 0)
1264 rc->frames_till_gf_update_due--;
1266 rc->frames_since_golden++;
1270 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
1271 const VP9_COMMON *const cm = &cpi->common;
1272 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1273 RATE_CONTROL *const rc = &cpi->rc;
1274 const int qindex = cm->base_qindex;
1276 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
1277 vp9_cyclic_refresh_postencode(cpi);
1280 // Update rate control heuristics
1281 rc->projected_frame_size = (int)(bytes_used << 3);
1283 // Post encode loop adjustment of Q prediction.
1284 vp9_rc_update_rate_correction_factors(cpi);
1286 // Keep a record of last Q and ambient average Q.
1287 if (cm->frame_type == KEY_FRAME) {
1288 rc->last_q[KEY_FRAME] = qindex;
1289 rc->avg_frame_qindex[KEY_FRAME] =
1290 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1293 SVC *svc = &cpi->svc;
1294 for (i = 0; i < svc->number_temporal_layers; ++i) {
1295 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, i,
1296 svc->number_temporal_layers);
1297 LAYER_CONTEXT *lc = &svc->layer_context[layer];
1298 RATE_CONTROL *lrc = &lc->rc;
1299 lrc->last_q[KEY_FRAME] = rc->last_q[KEY_FRAME];
1300 lrc->avg_frame_qindex[KEY_FRAME] = rc->avg_frame_qindex[KEY_FRAME];
1304 if (rc->is_src_frame_alt_ref ||
1305 !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) ||
1306 (cpi->use_svc && oxcf->rc_mode == VPX_CBR)) {
1307 rc->last_q[INTER_FRAME] = qindex;
1308 rc->avg_frame_qindex[INTER_FRAME] =
1309 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1311 rc->tot_q += vp9_convert_qindex_to_q(qindex, cm->bit_depth);
1312 rc->avg_q = rc->tot_q / rc->ni_frames;
1313 // Calculate the average Q for normal inter frames (not key or GFU
1315 rc->ni_tot_qi += qindex;
1316 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1320 // Keep record of last boosted (KF/KF/ARF) Q value.
1321 // If the current frame is coded at a lower Q then we also update it.
1322 // If all mbs in this group are skipped only update if the Q value is
1323 // better than that already stored.
1324 // This is used to help set quality in forced key frames to reduce popping
1325 if ((qindex < rc->last_boosted_qindex) ||
1326 (cm->frame_type == KEY_FRAME) ||
1327 (!rc->constrained_gf_group &&
1328 (cpi->refresh_alt_ref_frame ||
1329 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1330 rc->last_boosted_qindex = qindex;
1332 if (cm->frame_type == KEY_FRAME)
1333 rc->last_kf_qindex = qindex;
1335 update_buffer_level(cpi, rc->projected_frame_size);
1337 // Rolling monitors of whether we are over or underspending used to help
1338 // regulate min and Max Q in two pass.
1339 if (cm->frame_type != KEY_FRAME) {
1340 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1341 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1342 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1343 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1344 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1345 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1346 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1347 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1350 // Actual bits spent
1351 rc->total_actual_bits += rc->projected_frame_size;
1352 rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
1354 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1356 if (!cpi->use_svc || is_two_pass_svc(cpi)) {
1357 if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame &&
1358 (cm->frame_type != KEY_FRAME))
1359 // Update the alternate reference frame stats as appropriate.
1360 update_alt_ref_frame_stats(cpi);
1362 // Update the Golden frame stats as appropriate.
1363 update_golden_frame_stats(cpi);
1366 if (cm->frame_type == KEY_FRAME)
1367 rc->frames_since_key = 0;
1368 if (cm->show_frame) {
1369 rc->frames_since_key++;
1370 rc->frames_to_key--;
1373 // Trigger the resizing of the next frame if it is scaled.
1374 if (oxcf->pass != 0) {
1375 cpi->resize_pending =
1376 rc->next_frame_size_selector != rc->frame_size_selector;
1377 rc->frame_size_selector = rc->next_frame_size_selector;
1381 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
1382 // Update buffer level with zero size, update frame counters, and return.
1383 update_buffer_level(cpi, 0);
1384 cpi->rc.frames_since_key++;
1385 cpi->rc.frames_to_key--;
1386 cpi->rc.rc_2_frame = 0;
1387 cpi->rc.rc_1_frame = 0;
1390 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1391 #define USE_ALTREF_FOR_ONE_PASS 1
1393 static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1394 static const int af_ratio = 10;
1395 const RATE_CONTROL *const rc = &cpi->rc;
1397 #if USE_ALTREF_FOR_ONE_PASS
1398 target = (!rc->is_src_frame_alt_ref &&
1399 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1400 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1401 (rc->baseline_gf_interval + af_ratio - 1) :
1402 (rc->avg_frame_bandwidth * rc->baseline_gf_interval) /
1403 (rc->baseline_gf_interval + af_ratio - 1);
1405 target = rc->avg_frame_bandwidth;
1407 return vp9_rc_clamp_pframe_target_size(cpi, target);
1410 static int calc_iframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
1411 static const int kf_ratio = 25;
1412 const RATE_CONTROL *rc = &cpi->rc;
1413 const int target = rc->avg_frame_bandwidth * kf_ratio;
1414 return vp9_rc_clamp_iframe_target_size(cpi, target);
1417 void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
1418 VP9_COMMON *const cm = &cpi->common;
1419 RATE_CONTROL *const rc = &cpi->rc;
1421 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1422 if (!cpi->refresh_alt_ref_frame &&
1423 (cm->current_video_frame == 0 ||
1424 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1425 rc->frames_to_key == 0 ||
1426 (cpi->oxcf.auto_key && 0))) {
1427 cm->frame_type = KEY_FRAME;
1428 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1429 rc->frames_to_key == 0;
1430 rc->frames_to_key = cpi->oxcf.key_freq;
1431 rc->kf_boost = DEFAULT_KF_BOOST;
1432 rc->source_alt_ref_active = 0;
1434 cm->frame_type = INTER_FRAME;
1436 if (rc->frames_till_gf_update_due == 0) {
1437 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
1438 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1439 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1440 if (rc->frames_till_gf_update_due > rc->frames_to_key) {
1441 rc->frames_till_gf_update_due = rc->frames_to_key;
1442 rc->constrained_gf_group = 1;
1444 rc->constrained_gf_group = 0;
1446 cpi->refresh_golden_frame = 1;
1447 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1448 rc->gfu_boost = DEFAULT_GF_BOOST;
1450 if (cm->frame_type == KEY_FRAME)
1451 target = calc_iframe_target_size_one_pass_vbr(cpi);
1453 target = calc_pframe_target_size_one_pass_vbr(cpi);
1454 vp9_rc_set_frame_target(cpi, target);
1457 static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1458 const VP9EncoderConfig *oxcf = &cpi->oxcf;
1459 const RATE_CONTROL *rc = &cpi->rc;
1460 const SVC *const svc = &cpi->svc;
1461 const int64_t diff = rc->optimal_buffer_level - rc->buffer_level;
1462 const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100;
1463 int min_frame_target =
1464 VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS);
1467 if (oxcf->gf_cbr_boost_pct) {
1468 const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100;
1469 target = cpi->refresh_golden_frame ?
1470 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) /
1471 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) :
1472 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) /
1473 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100);
1475 target = rc->avg_frame_bandwidth;
1477 if (is_one_pass_cbr_svc(cpi)) {
1478 // Note that for layers, avg_frame_bandwidth is the cumulative
1479 // per-frame-bandwidth. For the target size of this frame, use the
1480 // layer average frame size (i.e., non-cumulative per-frame-bw).
1482 LAYER_IDS_TO_IDX(svc->spatial_layer_id,
1483 svc->temporal_layer_id, svc->number_temporal_layers);
1484 const LAYER_CONTEXT *lc = &svc->layer_context[layer];
1485 target = lc->avg_frame_size;
1486 min_frame_target = VPXMAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
1489 // Lower the target bandwidth for this frame.
1490 const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1491 target -= (target * pct_low) / 200;
1492 } else if (diff < 0) {
1493 // Increase the target bandwidth for this frame.
1494 const int pct_high =
1495 (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1496 target += (target * pct_high) / 200;
1498 if (oxcf->rc_max_inter_bitrate_pct) {
1499 const int max_rate = rc->avg_frame_bandwidth *
1500 oxcf->rc_max_inter_bitrate_pct / 100;
1501 target = VPXMIN(target, max_rate);
1503 return VPXMAX(min_frame_target, target);
1506 static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
1507 const RATE_CONTROL *rc = &cpi->rc;
1508 const VP9EncoderConfig *oxcf = &cpi->oxcf;
1509 const SVC *const svc = &cpi->svc;
1511 if (cpi->common.current_video_frame == 0) {
1512 target = ((rc->starting_buffer_level / 2) > INT_MAX)
1513 ? INT_MAX : (int)(rc->starting_buffer_level / 2);
1516 double framerate = cpi->framerate;
1517 if (svc->number_temporal_layers > 1 &&
1518 oxcf->rc_mode == VPX_CBR) {
1519 // Use the layer framerate for temporal layers CBR mode.
1520 const int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id,
1521 svc->temporal_layer_id, svc->number_temporal_layers);
1522 const LAYER_CONTEXT *lc = &svc->layer_context[layer];
1523 framerate = lc->framerate;
1525 kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16));
1526 if (rc->frames_since_key < framerate / 2) {
1527 kf_boost = (int)(kf_boost * rc->frames_since_key /
1530 target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4;
1532 return vp9_rc_clamp_iframe_target_size(cpi, target);
1535 // Reset information needed to set proper reference frames and buffer updates
1536 // for temporal layering. This is called when a key frame is encoded.
1537 static void reset_temporal_layer_to_zero(VP9_COMP *cpi) {
1539 LAYER_CONTEXT *lc = NULL;
1540 cpi->svc.temporal_layer_id = 0;
1542 for (sl = 0; sl < cpi->svc.number_spatial_layers; ++sl) {
1543 lc = &cpi->svc.layer_context[sl * cpi->svc.number_temporal_layers];
1544 lc->current_video_frame_in_layer = 0;
1545 lc->frames_from_key_frame = 0;
1549 void vp9_rc_get_svc_params(VP9_COMP *cpi) {
1550 VP9_COMMON *const cm = &cpi->common;
1551 RATE_CONTROL *const rc = &cpi->rc;
1552 int target = rc->avg_frame_bandwidth;
1553 const int layer = LAYER_IDS_TO_IDX(cpi->svc.spatial_layer_id,
1554 cpi->svc.temporal_layer_id, cpi->svc.number_temporal_layers);
1556 if ((cm->current_video_frame == 0) ||
1557 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1558 (cpi->oxcf.auto_key && (rc->frames_since_key %
1559 cpi->oxcf.key_freq == 0))) {
1560 cm->frame_type = KEY_FRAME;
1561 rc->source_alt_ref_active = 0;
1563 if (is_two_pass_svc(cpi)) {
1564 cpi->svc.layer_context[layer].is_key_frame = 1;
1565 cpi->ref_frame_flags &=
1566 (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
1567 } else if (is_one_pass_cbr_svc(cpi)) {
1568 cpi->svc.layer_context[layer].is_key_frame = 1;
1569 reset_temporal_layer_to_zero(cpi);
1570 cpi->ref_frame_flags &=
1571 (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
1572 // Assumption here is that LAST_FRAME is being updated for a keyframe.
1573 // Thus no change in update flags.
1574 target = calc_iframe_target_size_one_pass_cbr(cpi);
1577 cm->frame_type = INTER_FRAME;
1578 if (is_two_pass_svc(cpi)) {
1579 LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer];
1580 if (cpi->svc.spatial_layer_id == 0) {
1581 lc->is_key_frame = 0;
1584 cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame;
1585 if (lc->is_key_frame)
1586 cpi->ref_frame_flags &= (~VP9_LAST_FLAG);
1588 cpi->ref_frame_flags &= (~VP9_ALT_FLAG);
1589 } else if (is_one_pass_cbr_svc(cpi)) {
1590 LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer];
1591 if (cpi->svc.spatial_layer_id == 0) {
1592 lc->is_key_frame = 0;
1595 cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame;
1597 target = calc_pframe_target_size_one_pass_cbr(cpi);
1601 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1602 // should be done here, before the frame qp is selected.
1603 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1604 vp9_cyclic_refresh_update_parameters(cpi);
1606 vp9_rc_set_frame_target(cpi, target);
1607 rc->frames_till_gf_update_due = INT_MAX;
1608 rc->baseline_gf_interval = INT_MAX;
1611 void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
1612 VP9_COMMON *const cm = &cpi->common;
1613 RATE_CONTROL *const rc = &cpi->rc;
1615 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1616 if ((cm->current_video_frame == 0 ||
1617 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1618 rc->frames_to_key == 0 ||
1619 (cpi->oxcf.auto_key && 0))) {
1620 cm->frame_type = KEY_FRAME;
1621 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1622 rc->frames_to_key == 0;
1623 rc->frames_to_key = cpi->oxcf.key_freq;
1624 rc->kf_boost = DEFAULT_KF_BOOST;
1625 rc->source_alt_ref_active = 0;
1627 cm->frame_type = INTER_FRAME;
1629 if (rc->frames_till_gf_update_due == 0) {
1630 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1631 vp9_cyclic_refresh_set_golden_update(cpi);
1633 rc->baseline_gf_interval =
1634 (rc->min_gf_interval + rc->max_gf_interval) / 2;
1635 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1636 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1637 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1638 rc->frames_till_gf_update_due = rc->frames_to_key;
1639 cpi->refresh_golden_frame = 1;
1640 rc->gfu_boost = DEFAULT_GF_BOOST;
1643 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1644 // should be done here, before the frame qp is selected.
1645 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1646 vp9_cyclic_refresh_update_parameters(cpi);
1648 if (cm->frame_type == KEY_FRAME)
1649 target = calc_iframe_target_size_one_pass_cbr(cpi);
1651 target = calc_pframe_target_size_one_pass_cbr(cpi);
1653 vp9_rc_set_frame_target(cpi, target);
1654 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
1655 cpi->resize_pending = vp9_resize_one_pass_cbr(cpi);
1657 cpi->resize_pending = 0;
1660 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
1661 vpx_bit_depth_t bit_depth) {
1662 int start_index = rc->worst_quality;
1663 int target_index = rc->worst_quality;
1666 // Convert the average q value to an index.
1667 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1669 if (vp9_convert_qindex_to_q(i, bit_depth) >= qstart)
1673 // Convert the q target to an index
1674 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1676 if (vp9_convert_qindex_to_q(i, bit_depth) >= qtarget)
1680 return target_index - start_index;
1683 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1684 int qindex, double rate_target_ratio,
1685 vpx_bit_depth_t bit_depth) {
1686 int target_index = rc->worst_quality;
1689 // Look up the current projected bits per block for the base index
1690 const int base_bits_per_mb = vp9_rc_bits_per_mb(frame_type, qindex, 1.0,
1693 // Find the target bits per mb based on the base value and given ratio.
1694 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1696 // Convert the q target to an index
1697 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1698 if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
1699 target_bits_per_mb) {
1704 return target_index - qindex;
1707 void vp9_rc_set_gf_interval_range(const VP9_COMP *const cpi,
1708 RATE_CONTROL *const rc) {
1709 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1711 // Set Maximum gf/arf interval
1712 rc->max_gf_interval = oxcf->max_gf_interval;
1713 rc->min_gf_interval = oxcf->min_gf_interval;
1714 if (rc->min_gf_interval == 0)
1715 rc->min_gf_interval = vp9_rc_get_default_min_gf_interval(
1716 oxcf->width, oxcf->height, cpi->framerate);
1717 if (rc->max_gf_interval == 0)
1718 rc->max_gf_interval = vp9_rc_get_default_max_gf_interval(
1719 cpi->framerate, rc->min_gf_interval);
1721 // Extended interval for genuinely static scenes
1722 rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;
1724 if (is_altref_enabled(cpi)) {
1725 if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
1726 rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
1729 if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
1730 rc->max_gf_interval = rc->static_scene_max_gf_interval;
1733 rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval);
1736 void vp9_rc_update_framerate(VP9_COMP *cpi) {
1737 const VP9_COMMON *const cm = &cpi->common;
1738 const VP9EncoderConfig *const oxcf = &cpi->oxcf;
1739 RATE_CONTROL *const rc = &cpi->rc;
1742 rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate);
1743 rc->min_frame_bandwidth = (int)(rc->avg_frame_bandwidth *
1744 oxcf->two_pass_vbrmin_section / 100);
1746 rc->min_frame_bandwidth =
1747 VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
1749 // A maximum bitrate for a frame is defined.
1750 // The baseline for this aligns with HW implementations that
1751 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
1752 // per 16x16 MB (averaged over a frame). However this limit is extended if
1753 // a very high rate is given on the command line or the the rate cannnot
1754 // be acheived because of a user specificed max q (e.g. when the user
1755 // specifies lossless encode.
1756 vbr_max_bits = (int)(((int64_t)rc->avg_frame_bandwidth *
1757 oxcf->two_pass_vbrmax_section) / 100);
1758 rc->max_frame_bandwidth =
1759 VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
1761 vp9_rc_set_gf_interval_range(cpi, rc);
1764 #define VBR_PCT_ADJUSTMENT_LIMIT 50
1765 // For VBR...adjustment to the frame target based on error from previous frames
1766 static void vbr_rate_correction(VP9_COMP *cpi, int *this_frame_target) {
1767 RATE_CONTROL *const rc = &cpi->rc;
1768 int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
1770 double position_factor = 1.0;
1772 // How far through the clip are we.
1773 // This number is used to damp the per frame rate correction.
1775 if (cpi->twopass.total_stats.count) {
1776 position_factor = sqrt((double)cpi->common.current_video_frame /
1777 cpi->twopass.total_stats.count);
1779 max_delta = (int)(position_factor *
1780 ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100));
1782 // vbr_bits_off_target > 0 means we have extra bits to spend
1783 if (vbr_bits_off_target > 0) {
1784 *this_frame_target +=
1785 (vbr_bits_off_target > max_delta) ? max_delta
1786 : (int)vbr_bits_off_target;
1788 *this_frame_target -=
1789 (vbr_bits_off_target < -max_delta) ? max_delta
1790 : (int)-vbr_bits_off_target;
1793 // Fast redistribution of bits arising from massive local undershoot.
1794 // Dont do it for kf,arf,gf or overlay frames.
1795 if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
1796 rc->vbr_bits_off_target_fast) {
1797 int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target);
1798 int fast_extra_bits;
1799 fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
1800 fast_extra_bits = (int)VPXMIN(
1802 VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
1803 *this_frame_target += (int)fast_extra_bits;
1804 rc->vbr_bits_off_target_fast -= fast_extra_bits;
1808 void vp9_set_target_rate(VP9_COMP *cpi) {
1809 RATE_CONTROL *const rc = &cpi->rc;
1810 int target_rate = rc->base_frame_target;
1812 // Correction to rate target based on prior over or under shoot.
1813 if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
1814 vbr_rate_correction(cpi, &target_rate);
1815 vp9_rc_set_frame_target(cpi, target_rate);
1818 // Check if we should resize, based on average QP from past x frames.
1819 // Only allow for resize at most one scale down for now, scaling factor is 2.
1820 int vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
1821 const VP9_COMMON *const cm = &cpi->common;
1822 RATE_CONTROL *const rc = &cpi->rc;
1824 cpi->resize_scale_num = 1;
1825 cpi->resize_scale_den = 1;
1826 // Don't resize on key frame; reset the counters on key frame.
1827 if (cm->frame_type == KEY_FRAME) {
1828 cpi->resize_avg_qp = 0;
1829 cpi->resize_count = 0;
1832 // Resize based on average buffer underflow and QP over some window.
1833 // Ignore samples close to key frame, since QP is usually high after key.
1834 if (cpi->rc.frames_since_key > 1 * cpi->framerate) {
1835 const int window = (int)(4 * cpi->framerate);
1836 cpi->resize_avg_qp += cm->base_qindex;
1837 if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
1838 ++cpi->resize_buffer_underflow;
1839 ++cpi->resize_count;
1840 // Check for resize action every "window" frames.
1841 if (cpi->resize_count >= window) {
1842 int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
1843 // Resize down if buffer level has underflowed sufficent amount in past
1844 // window, and we are at original resolution.
1845 // Resize back up if average QP is low, and we are currently in a resized
1847 if (cpi->resize_state == 0 &&
1848 cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
1850 cpi->resize_state = 1;
1851 } else if (cpi->resize_state == 1 &&
1852 avg_qp < 50 * cpi->rc.worst_quality / 100) {
1854 cpi->resize_state = 0;
1856 // Reset for next window measurement.
1857 cpi->resize_avg_qp = 0;
1858 cpi->resize_count = 0;
1859 cpi->resize_buffer_underflow = 0;
1862 // If decision is to resize, reset some quantities, and check is we should
1863 // reduce rate correction factor,
1864 if (resize_now != 0) {
1865 int target_bits_per_frame;
1866 int active_worst_quality;
1868 int tot_scale_change;
1869 // For now, resize is by 1/2 x 1/2.
1870 cpi->resize_scale_num = 1;
1871 cpi->resize_scale_den = 2;
1872 tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
1873 (cpi->resize_scale_num * cpi->resize_scale_num);
1874 // Reset buffer level to optimal, update target size.
1875 rc->buffer_level = rc->optimal_buffer_level;
1876 rc->bits_off_target = rc->optimal_buffer_level;
1877 rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
1878 // Reset cyclic refresh parameters.
1879 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled)
1880 vp9_cyclic_refresh_reset_resize(cpi);
1881 // Get the projected qindex, based on the scaled target frame size (scaled
1882 // so target_bits_per_mb in vp9_rc_regulate_q will be correct target).
1883 target_bits_per_frame = (resize_now == 1) ?
1884 rc->this_frame_target * tot_scale_change :
1885 rc->this_frame_target / tot_scale_change;
1886 active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
1887 qindex = vp9_rc_regulate_q(cpi,
1888 target_bits_per_frame,
1890 active_worst_quality);
1891 // If resize is down, check if projected q index is close to worst_quality,
1892 // and if so, reduce the rate correction factor (since likely can afford
1893 // lower q for resized frame).
1894 if (resize_now == 1 &&
1895 qindex > 90 * cpi->rc.worst_quality / 100) {
1896 rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
1898 // If resize is back up, check if projected q index is too much above the
1899 // current base_qindex, and if so, reduce the rate correction factor
1900 // (since prefer to keep q for resized frame at least close to previous q).
1901 if (resize_now == -1 &&
1902 qindex > 130 * cm->base_qindex / 100) {
1903 rc->rate_correction_factors[INTER_NORMAL] *= 0.9;
1909 // Compute average source sad (temporal sad: between current source and
1910 // previous source) over a subset of superblocks. Use this is detect big changes
1911 // in content and allow rate control to react.
1912 // TODO(marpan): Superblock sad is computed again in variance partition for
1913 // non-rd mode (but based on last reconstructed frame). Should try to reuse
1914 // these computations.
1915 void vp9_avg_source_sad(VP9_COMP *cpi) {
1916 VP9_COMMON * const cm = &cpi->common;
1917 RATE_CONTROL *const rc = &cpi->rc;
1918 rc->high_source_sad = 0;
1919 if (cpi->Last_Source != NULL) {
1920 const uint8_t *src_y = cpi->Source->y_buffer;
1921 const int src_ystride = cpi->Source->y_stride;
1922 const uint8_t *last_src_y = cpi->Last_Source->y_buffer;
1923 const int last_src_ystride = cpi->Last_Source->y_stride;
1924 int sbi_row, sbi_col;
1925 const BLOCK_SIZE bsize = BLOCK_64X64;
1926 // Loop over sub-sample of frame, and compute average sad over 64x64 blocks.
1927 uint64_t avg_sad = 0;
1928 int num_samples = 0;
1929 int sb_cols = (cm->mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
1930 int sb_rows = (cm->mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
1931 for (sbi_row = 0; sbi_row < sb_rows; sbi_row ++) {
1932 for (sbi_col = 0; sbi_col < sb_cols; sbi_col ++) {
1933 // Checker-board pattern, ignore boundary.
1934 if ((sbi_row > 0 && sbi_col > 0) &&
1935 (sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) &&
1936 ((sbi_row % 2 == 0 && sbi_col % 2 == 0) ||
1937 (sbi_row % 2 != 0 && sbi_col % 2 != 0))) {
1939 avg_sad += cpi->fn_ptr[bsize].sdf(src_y,
1947 src_y += (src_ystride << 6) - (sb_cols << 6);
1948 last_src_y += (last_src_ystride << 6) - (sb_cols << 6);
1950 if (num_samples > 0)
1951 avg_sad = avg_sad / num_samples;
1952 // Set high_source_sad flag if we detect very high increase in avg_sad
1953 // between current and the previous frame value(s). Use a minimum threshold
1954 // for cases where there is small change from content that is completely
1956 if (avg_sad > VPXMAX(4000, (rc->avg_source_sad << 3)) &&
1957 rc->frames_since_key > 1)
1958 rc->high_source_sad = 1;
1960 rc->high_source_sad = 0;
1961 rc->avg_source_sad = (rc->avg_source_sad + avg_sad) >> 1;
1965 // Test if encoded frame will significantly overshoot the target bitrate, and
1966 // if so, set the QP, reset/adjust some rate control parameters, and return 1.
1967 int vp9_encodedframe_overshoot(VP9_COMP *cpi,
1970 VP9_COMMON * const cm = &cpi->common;
1971 RATE_CONTROL *const rc = &cpi->rc;
1972 int thresh_qp = 3 * (rc->worst_quality >> 2);
1973 int thresh_rate = rc->avg_frame_bandwidth * 10;
1974 if (cm->base_qindex < thresh_qp &&
1975 frame_size > thresh_rate) {
1976 // Force a re-encode, and for now use max-QP.
1977 *q = cpi->rc.worst_quality;
1978 // Adjust avg_frame_qindex and buffer_level, as these parameters will affect
1979 // QP selection for subsequent frames. If they have settled down to a very
1980 // different (low QP) state, then not re-adjusting them may cause next
1981 // frame to select low QP and overshoot again.
1982 // TODO(marpan): Check if rate correction factor should also be adjusted.
1983 cpi->rc.avg_frame_qindex[INTER_FRAME] = *q;
1984 rc->buffer_level = rc->optimal_buffer_level;
1985 rc->bits_off_target = rc->optimal_buffer_level;