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 "vp10/common/alloccommon.h"
24 #include "vp10/encoder/aq_cyclicrefresh.h"
25 #include "vp10/common/common.h"
26 #include "vp10/common/entropymode.h"
27 #include "vp10/common/quant_common.h"
28 #include "vp10/common/seg_common.h"
30 #include "vp10/encoder/encodemv.h"
31 #include "vp10/encoder/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, maxq);
112 // Special case handling to deal with the step from q2.0
113 // down to lossless mode represented by q 1.0.
114 if (minqtarget <= 2.0)
117 for (i = 0; i < QINDEX_RANGE; i++) {
118 if (minqtarget <= vp10_convert_qindex_to_q(i, bit_depth))
122 return QINDEX_RANGE - 1;
125 static void init_minq_luts(int *kf_low_m, int *kf_high_m,
126 int *arfgf_low, int *arfgf_high,
127 int *inter, int *rtc, vpx_bit_depth_t bit_depth) {
129 for (i = 0; i < QINDEX_RANGE; i++) {
130 const double maxq = vp10_convert_qindex_to_q(i, bit_depth);
131 kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth);
132 kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
133 arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
134 arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
135 inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth);
136 rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
140 void vp10_rc_init_minq_luts(void) {
141 init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8,
142 arfgf_low_motion_minq_8, arfgf_high_motion_minq_8,
143 inter_minq_8, rtc_minq_8, VPX_BITS_8);
144 #if CONFIG_VP9_HIGHBITDEPTH
145 init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10,
146 arfgf_low_motion_minq_10, arfgf_high_motion_minq_10,
147 inter_minq_10, rtc_minq_10, VPX_BITS_10);
148 init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12,
149 arfgf_low_motion_minq_12, arfgf_high_motion_minq_12,
150 inter_minq_12, rtc_minq_12, VPX_BITS_12);
154 // These functions use formulaic calculations to make playing with the
155 // quantizer tables easier. If necessary they can be replaced by lookup
156 // tables if and when things settle down in the experimental bitstream
157 double vp10_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) {
158 // Convert the index to a real Q value (scaled down to match old Q values)
159 #if CONFIG_VP9_HIGHBITDEPTH
162 return vp10_ac_quant(qindex, 0, bit_depth) / 4.0;
164 return vp10_ac_quant(qindex, 0, bit_depth) / 16.0;
166 return vp10_ac_quant(qindex, 0, bit_depth) / 64.0;
168 assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12");
172 return vp10_ac_quant(qindex, 0, bit_depth) / 4.0;
176 int vp10_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
177 double correction_factor,
178 vpx_bit_depth_t bit_depth) {
179 const double q = vp10_convert_qindex_to_q(qindex, bit_depth);
180 int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000;
182 assert(correction_factor <= MAX_BPB_FACTOR &&
183 correction_factor >= MIN_BPB_FACTOR);
185 // q based adjustment to baseline enumerator
186 enumerator += (int)(enumerator * q) >> 12;
187 return (int)(enumerator * correction_factor / q);
190 int vp10_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
191 double correction_factor,
192 vpx_bit_depth_t bit_depth) {
193 const int bpm = (int)(vp10_rc_bits_per_mb(frame_type, q, correction_factor,
195 return VPXMAX(FRAME_OVERHEAD_BITS,
196 (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
199 int vp10_rc_clamp_pframe_target_size(const VP10_COMP *const cpi, int target) {
200 const RATE_CONTROL *rc = &cpi->rc;
201 const VP10EncoderConfig *oxcf = &cpi->oxcf;
202 const int min_frame_target = VPXMAX(rc->min_frame_bandwidth,
203 rc->avg_frame_bandwidth >> 5);
204 if (target < min_frame_target)
205 target = min_frame_target;
206 if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
207 // If there is an active ARF at this location use the minimum
208 // bits on this frame even if it is a constructed arf.
209 // The active maximum quantizer insures that an appropriate
210 // number of bits will be spent if needed for constructed ARFs.
211 target = min_frame_target;
213 // Clip the frame target to the maximum allowed value.
214 if (target > rc->max_frame_bandwidth)
215 target = rc->max_frame_bandwidth;
216 if (oxcf->rc_max_inter_bitrate_pct) {
217 const int max_rate = rc->avg_frame_bandwidth *
218 oxcf->rc_max_inter_bitrate_pct / 100;
219 target = VPXMIN(target, max_rate);
224 int vp10_rc_clamp_iframe_target_size(const VP10_COMP *const cpi, int target) {
225 const RATE_CONTROL *rc = &cpi->rc;
226 const VP10EncoderConfig *oxcf = &cpi->oxcf;
227 if (oxcf->rc_max_intra_bitrate_pct) {
228 const int max_rate = rc->avg_frame_bandwidth *
229 oxcf->rc_max_intra_bitrate_pct / 100;
230 target = VPXMIN(target, max_rate);
232 if (target > rc->max_frame_bandwidth)
233 target = rc->max_frame_bandwidth;
237 // Update the buffer level: leaky bucket model.
238 static void update_buffer_level(VP10_COMP *cpi, int encoded_frame_size) {
239 const VP10_COMMON *const cm = &cpi->common;
240 RATE_CONTROL *const rc = &cpi->rc;
242 // Non-viewable frames are a special case and are treated as pure overhead.
243 if (!cm->show_frame) {
244 rc->bits_off_target -= encoded_frame_size;
246 rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
249 // Clip the buffer level to the maximum specified buffer size.
250 rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size);
251 rc->buffer_level = rc->bits_off_target;
254 int vp10_rc_get_default_min_gf_interval(
255 int width, int height, double framerate) {
256 // Assume we do not need any constraint lower than 4K 20 fps
257 static const double factor_safe = 3840 * 2160 * 20.0;
258 const double factor = width * height * framerate;
259 const int default_interval =
260 clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL);
262 if (factor <= factor_safe)
263 return default_interval;
265 return VPXMAX(default_interval,
266 (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
267 // Note this logic makes:
273 int vp10_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) {
274 int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75));
275 interval += (interval & 0x01); // Round to even value
276 return VPXMAX(interval, min_gf_interval);
279 void vp10_rc_init(const VP10EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
282 if (pass == 0 && oxcf->rc_mode == VPX_CBR) {
283 rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
284 rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
286 rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q +
287 oxcf->best_allowed_q) / 2;
288 rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
289 oxcf->best_allowed_q) / 2;
292 rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
293 rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
295 rc->buffer_level = rc->starting_buffer_level;
296 rc->bits_off_target = rc->starting_buffer_level;
298 rc->rolling_target_bits = rc->avg_frame_bandwidth;
299 rc->rolling_actual_bits = rc->avg_frame_bandwidth;
300 rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
301 rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
303 rc->total_actual_bits = 0;
304 rc->total_target_bits = 0;
305 rc->total_target_vs_actual = 0;
307 rc->frames_since_key = 8; // Sensible default for first frame.
308 rc->this_key_frame_forced = 0;
309 rc->next_key_frame_forced = 0;
310 rc->source_alt_ref_pending = 0;
311 rc->source_alt_ref_active = 0;
313 rc->frames_till_gf_update_due = 0;
314 rc->ni_av_qi = oxcf->worst_allowed_q;
319 rc->avg_q = vp10_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
321 for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
322 rc->rate_correction_factors[i] = 1.0;
325 rc->min_gf_interval = oxcf->min_gf_interval;
326 rc->max_gf_interval = oxcf->max_gf_interval;
327 if (rc->min_gf_interval == 0)
328 rc->min_gf_interval = vp10_rc_get_default_min_gf_interval(
329 oxcf->width, oxcf->height, oxcf->init_framerate);
330 if (rc->max_gf_interval == 0)
331 rc->max_gf_interval = vp10_rc_get_default_max_gf_interval(
332 oxcf->init_framerate, rc->min_gf_interval);
333 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
336 int vp10_rc_drop_frame(VP10_COMP *cpi) {
337 const VP10EncoderConfig *oxcf = &cpi->oxcf;
338 RATE_CONTROL *const rc = &cpi->rc;
340 if (!oxcf->drop_frames_water_mark) {
343 if (rc->buffer_level < 0) {
344 // Always drop if buffer is below 0.
347 // If buffer is below drop_mark, for now just drop every other frame
348 // (starting with the next frame) until it increases back over drop_mark.
349 int drop_mark = (int)(oxcf->drop_frames_water_mark *
350 rc->optimal_buffer_level / 100);
351 if ((rc->buffer_level > drop_mark) &&
352 (rc->decimation_factor > 0)) {
353 --rc->decimation_factor;
354 } else if (rc->buffer_level <= drop_mark &&
355 rc->decimation_factor == 0) {
356 rc->decimation_factor = 1;
358 if (rc->decimation_factor > 0) {
359 if (rc->decimation_count > 0) {
360 --rc->decimation_count;
363 rc->decimation_count = rc->decimation_factor;
367 rc->decimation_count = 0;
374 static double get_rate_correction_factor(const VP10_COMP *cpi) {
375 const RATE_CONTROL *const rc = &cpi->rc;
378 if (cpi->common.frame_type == KEY_FRAME) {
379 rcf = rc->rate_correction_factors[KF_STD];
380 } else if (cpi->oxcf.pass == 2) {
381 RATE_FACTOR_LEVEL rf_lvl =
382 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
383 rcf = rc->rate_correction_factors[rf_lvl];
385 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
386 !rc->is_src_frame_alt_ref &&
387 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
388 rcf = rc->rate_correction_factors[GF_ARF_STD];
390 rcf = rc->rate_correction_factors[INTER_NORMAL];
392 rcf *= rcf_mult[rc->frame_size_selector];
393 return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
396 static void set_rate_correction_factor(VP10_COMP *cpi, double factor) {
397 RATE_CONTROL *const rc = &cpi->rc;
399 // Normalize RCF to account for the size-dependent scaling factor.
400 factor /= rcf_mult[cpi->rc.frame_size_selector];
402 factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
404 if (cpi->common.frame_type == KEY_FRAME) {
405 rc->rate_correction_factors[KF_STD] = factor;
406 } else if (cpi->oxcf.pass == 2) {
407 RATE_FACTOR_LEVEL rf_lvl =
408 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
409 rc->rate_correction_factors[rf_lvl] = factor;
411 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
412 !rc->is_src_frame_alt_ref &&
413 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
414 rc->rate_correction_factors[GF_ARF_STD] = factor;
416 rc->rate_correction_factors[INTER_NORMAL] = factor;
420 void vp10_rc_update_rate_correction_factors(VP10_COMP *cpi) {
421 const VP10_COMMON *const cm = &cpi->common;
422 int correction_factor = 100;
423 double rate_correction_factor = get_rate_correction_factor(cpi);
424 double adjustment_limit;
426 int projected_size_based_on_q = 0;
428 // Do not update the rate factors for arf overlay frames.
429 if (cpi->rc.is_src_frame_alt_ref)
432 // Clear down mmx registers to allow floating point in what follows
433 vpx_clear_system_state();
435 // Work out how big we would have expected the frame to be at this Q given
436 // the current correction factor.
437 // Stay in double to avoid int overflow when values are large
438 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) {
439 projected_size_based_on_q =
440 vp10_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
442 projected_size_based_on_q = vp10_estimate_bits_at_q(cpi->common.frame_type,
445 rate_correction_factor,
448 // Work out a size correction factor.
449 if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
450 correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) /
451 projected_size_based_on_q);
453 // More heavily damped adjustment used if we have been oscillating either side
455 adjustment_limit = 0.25 +
456 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor)));
458 cpi->rc.q_2_frame = cpi->rc.q_1_frame;
459 cpi->rc.q_1_frame = cm->base_qindex;
460 cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
461 if (correction_factor > 110)
462 cpi->rc.rc_1_frame = -1;
463 else if (correction_factor < 90)
464 cpi->rc.rc_1_frame = 1;
466 cpi->rc.rc_1_frame = 0;
468 if (correction_factor > 102) {
469 // We are not already at the worst allowable quality
470 correction_factor = (int)(100 + ((correction_factor - 100) *
472 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
473 // Keep rate_correction_factor within limits
474 if (rate_correction_factor > MAX_BPB_FACTOR)
475 rate_correction_factor = MAX_BPB_FACTOR;
476 } else if (correction_factor < 99) {
477 // We are not already at the best allowable quality
478 correction_factor = (int)(100 - ((100 - correction_factor) *
480 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
482 // Keep rate_correction_factor within limits
483 if (rate_correction_factor < MIN_BPB_FACTOR)
484 rate_correction_factor = MIN_BPB_FACTOR;
487 set_rate_correction_factor(cpi, rate_correction_factor);
491 int vp10_rc_regulate_q(const VP10_COMP *cpi, int target_bits_per_frame,
492 int active_best_quality, int active_worst_quality) {
493 const VP10_COMMON *const cm = &cpi->common;
494 int q = active_worst_quality;
495 int last_error = INT_MAX;
496 int i, target_bits_per_mb, bits_per_mb_at_this_q;
497 const double correction_factor = get_rate_correction_factor(cpi);
499 // Calculate required scaling factor based on target frame size and size of
500 // frame produced using previous Q.
502 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
504 i = active_best_quality;
507 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
508 bits_per_mb_at_this_q =
509 (int)vp10_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
511 bits_per_mb_at_this_q = (int)vp10_rc_bits_per_mb(cm->frame_type, i,
516 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
517 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
524 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
526 } while (++i <= active_worst_quality);
528 // In CBR mode, this makes sure q is between oscillating Qs to prevent
530 if (cpi->oxcf.rc_mode == VPX_CBR &&
531 (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
532 cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
533 q = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
534 VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
539 static int get_active_quality(int q, int gfu_boost, int low, int high,
540 int *low_motion_minq, int *high_motion_minq) {
541 if (gfu_boost > high) {
542 return low_motion_minq[q];
543 } else if (gfu_boost < low) {
544 return high_motion_minq[q];
546 const int gap = high - low;
547 const int offset = high - gfu_boost;
548 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
549 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
550 return low_motion_minq[q] + adjustment;
554 static int get_kf_active_quality(const RATE_CONTROL *const rc, int q,
555 vpx_bit_depth_t bit_depth) {
556 int *kf_low_motion_minq;
557 int *kf_high_motion_minq;
558 ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq);
559 ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq);
560 return get_active_quality(q, rc->kf_boost, kf_low, kf_high,
561 kf_low_motion_minq, kf_high_motion_minq);
564 static int get_gf_active_quality(const RATE_CONTROL *const rc, int q,
565 vpx_bit_depth_t bit_depth) {
566 int *arfgf_low_motion_minq;
567 int *arfgf_high_motion_minq;
568 ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq);
569 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
570 return get_active_quality(q, rc->gfu_boost, gf_low, gf_high,
571 arfgf_low_motion_minq, arfgf_high_motion_minq);
574 static int calc_active_worst_quality_one_pass_vbr(const VP10_COMP *cpi) {
575 const RATE_CONTROL *const rc = &cpi->rc;
576 const unsigned int curr_frame = cpi->common.current_video_frame;
577 int active_worst_quality;
579 if (cpi->common.frame_type == KEY_FRAME) {
580 active_worst_quality = curr_frame == 0 ? rc->worst_quality
581 : rc->last_q[KEY_FRAME] * 2;
583 if (!rc->is_src_frame_alt_ref &&
584 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
585 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
586 : rc->last_q[INTER_FRAME];
588 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
589 : rc->last_q[INTER_FRAME] * 2;
592 return VPXMIN(active_worst_quality, rc->worst_quality);
595 // Adjust active_worst_quality level based on buffer level.
596 static int calc_active_worst_quality_one_pass_cbr(const VP10_COMP *cpi) {
597 // Adjust active_worst_quality: If buffer is above the optimal/target level,
598 // bring active_worst_quality down depending on fullness of buffer.
599 // If buffer is below the optimal level, let the active_worst_quality go from
600 // ambient Q (at buffer = optimal level) to worst_quality level
601 // (at buffer = critical level).
602 const VP10_COMMON *const cm = &cpi->common;
603 const RATE_CONTROL *rc = &cpi->rc;
604 // Buffer level below which we push active_worst to worst_quality.
605 int64_t critical_level = rc->optimal_buffer_level >> 3;
606 int64_t buff_lvl_step = 0;
608 int active_worst_quality;
610 if (cm->frame_type == KEY_FRAME)
611 return rc->worst_quality;
612 // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME]
613 // for the first few frames following key frame. These are both initialized
614 // to worst_quality and updated with (3/4, 1/4) average in postencode_update.
615 // So for first few frames following key, the qp of that key frame is weighted
616 // into the active_worst_quality setting.
617 ambient_qp = (cm->current_video_frame < 5) ?
618 VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
619 rc->avg_frame_qindex[KEY_FRAME]) :
620 rc->avg_frame_qindex[INTER_FRAME];
621 active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4);
622 if (rc->buffer_level > rc->optimal_buffer_level) {
624 // Maximum limit for down adjustment, ~30%.
625 int max_adjustment_down = active_worst_quality / 3;
626 if (max_adjustment_down) {
627 buff_lvl_step = ((rc->maximum_buffer_size -
628 rc->optimal_buffer_level) / max_adjustment_down);
630 adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) /
632 active_worst_quality -= adjustment;
634 } else if (rc->buffer_level > critical_level) {
635 // Adjust up from ambient Q.
636 if (critical_level) {
637 buff_lvl_step = (rc->optimal_buffer_level - critical_level);
639 adjustment = (int)((rc->worst_quality - ambient_qp) *
640 (rc->optimal_buffer_level - rc->buffer_level) /
643 active_worst_quality = ambient_qp + adjustment;
646 // Set to worst_quality if buffer is below critical level.
647 active_worst_quality = rc->worst_quality;
649 return active_worst_quality;
652 static int rc_pick_q_and_bounds_one_pass_cbr(const VP10_COMP *cpi,
655 const VP10_COMMON *const cm = &cpi->common;
656 const RATE_CONTROL *const rc = &cpi->rc;
657 int active_best_quality;
658 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
661 ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq);
663 if (frame_is_intra_only(cm)) {
664 active_best_quality = rc->best_quality;
665 // Handle the special case for key frames forced when we have reached
666 // the maximum key frame interval. Here force the Q to a range
667 // based on the ambient Q to reduce the risk of popping.
668 if (rc->this_key_frame_forced) {
669 int qindex = rc->last_boosted_qindex;
670 double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
671 int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
672 (last_boosted_q * 0.75),
674 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
675 } else if (cm->current_video_frame > 0) {
676 // not first frame of one pass and kf_boost is set
677 double q_adj_factor = 1.0;
680 active_best_quality =
681 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
684 // Allow somewhat lower kf minq with small image formats.
685 if ((cm->width * cm->height) <= (352 * 288)) {
686 q_adj_factor -= 0.25;
689 // Convert the adjustment factor to a qindex delta
690 // on active_best_quality.
691 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
692 active_best_quality += vp10_compute_qdelta(rc, q_val,
693 q_val * q_adj_factor,
696 } else if (!rc->is_src_frame_alt_ref &&
697 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
698 // Use the lower of active_worst_quality and recent
699 // average Q as basis for GF/ARF best Q limit unless last frame was
701 if (rc->frames_since_key > 1 &&
702 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
703 q = rc->avg_frame_qindex[INTER_FRAME];
705 q = active_worst_quality;
707 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
709 // Use the lower of active_worst_quality and recent/average Q.
710 if (cm->current_video_frame > 1) {
711 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
712 active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]];
714 active_best_quality = rtc_minq[active_worst_quality];
716 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
717 active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]];
719 active_best_quality = rtc_minq[active_worst_quality];
723 // Clip the active best and worst quality values to limits
724 active_best_quality = clamp(active_best_quality,
725 rc->best_quality, rc->worst_quality);
726 active_worst_quality = clamp(active_worst_quality,
727 active_best_quality, rc->worst_quality);
729 *top_index = active_worst_quality;
730 *bottom_index = active_best_quality;
732 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
733 // Limit Q range for the adaptive loop.
734 if (cm->frame_type == KEY_FRAME &&
735 !rc->this_key_frame_forced &&
736 !(cm->current_video_frame == 0)) {
738 vpx_clear_system_state();
739 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
740 active_worst_quality, 2.0,
742 *top_index = active_worst_quality + qdelta;
743 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
747 // Special case code to try and match quality with forced key frames
748 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
749 q = rc->last_boosted_qindex;
751 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
752 active_best_quality, active_worst_quality);
753 if (q > *top_index) {
754 // Special case when we are targeting the max allowed rate
755 if (rc->this_frame_target >= rc->max_frame_bandwidth)
761 assert(*top_index <= rc->worst_quality &&
762 *top_index >= rc->best_quality);
763 assert(*bottom_index <= rc->worst_quality &&
764 *bottom_index >= rc->best_quality);
765 assert(q <= rc->worst_quality && q >= rc->best_quality);
769 static int get_active_cq_level(const RATE_CONTROL *rc,
770 const VP10EncoderConfig *const oxcf) {
771 static const double cq_adjust_threshold = 0.1;
772 int active_cq_level = oxcf->cq_level;
773 if (oxcf->rc_mode == VPX_CQ &&
774 rc->total_target_bits > 0) {
775 const double x = (double)rc->total_actual_bits / rc->total_target_bits;
776 if (x < cq_adjust_threshold) {
777 active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold);
780 return active_cq_level;
783 static int rc_pick_q_and_bounds_one_pass_vbr(const VP10_COMP *cpi,
786 const VP10_COMMON *const cm = &cpi->common;
787 const RATE_CONTROL *const rc = &cpi->rc;
788 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
789 const int cq_level = get_active_cq_level(rc, oxcf);
790 int active_best_quality;
791 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
794 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
796 if (frame_is_intra_only(cm)) {
797 if (oxcf->rc_mode == VPX_Q) {
798 int qindex = cq_level;
799 double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
800 int delta_qindex = vp10_compute_qdelta(rc, q, q * 0.25,
802 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
803 } else if (rc->this_key_frame_forced) {
804 int qindex = rc->last_boosted_qindex;
805 double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
806 int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
807 last_boosted_q * 0.75,
809 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
811 // not first frame of one pass and kf_boost is set
812 double q_adj_factor = 1.0;
815 active_best_quality =
816 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
819 // Allow somewhat lower kf minq with small image formats.
820 if ((cm->width * cm->height) <= (352 * 288)) {
821 q_adj_factor -= 0.25;
824 // Convert the adjustment factor to a qindex delta
825 // on active_best_quality.
826 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
827 active_best_quality += vp10_compute_qdelta(rc, q_val,
828 q_val * q_adj_factor,
831 } else if (!rc->is_src_frame_alt_ref &&
832 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
833 // Use the lower of active_worst_quality and recent
834 // average Q as basis for GF/ARF best Q limit unless last frame was
836 if (rc->frames_since_key > 1 &&
837 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
838 q = rc->avg_frame_qindex[INTER_FRAME];
840 q = rc->avg_frame_qindex[KEY_FRAME];
842 // For constrained quality dont allow Q less than the cq level
843 if (oxcf->rc_mode == VPX_CQ) {
847 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
849 // Constrained quality use slightly lower active best.
850 active_best_quality = active_best_quality * 15 / 16;
852 } else if (oxcf->rc_mode == VPX_Q) {
853 int qindex = cq_level;
854 double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
856 if (cpi->refresh_alt_ref_frame)
857 delta_qindex = vp10_compute_qdelta(rc, q, q * 0.40, cm->bit_depth);
859 delta_qindex = vp10_compute_qdelta(rc, q, q * 0.50, cm->bit_depth);
860 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
862 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
865 if (oxcf->rc_mode == VPX_Q) {
866 int qindex = cq_level;
867 double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
868 double delta_rate[FIXED_GF_INTERVAL] =
869 {0.50, 1.0, 0.85, 1.0, 0.70, 1.0, 0.85, 1.0};
871 vp10_compute_qdelta(rc, q,
872 q * delta_rate[cm->current_video_frame %
873 FIXED_GF_INTERVAL], cm->bit_depth);
874 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
876 // Use the lower of active_worst_quality and recent/average Q.
877 if (cm->current_video_frame > 1)
878 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
880 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
881 // For the constrained quality mode we don't want
882 // q to fall below the cq level.
883 if ((oxcf->rc_mode == VPX_CQ) &&
884 (active_best_quality < cq_level)) {
885 active_best_quality = cq_level;
890 // Clip the active best and worst quality values to limits
891 active_best_quality = clamp(active_best_quality,
892 rc->best_quality, rc->worst_quality);
893 active_worst_quality = clamp(active_worst_quality,
894 active_best_quality, rc->worst_quality);
896 *top_index = active_worst_quality;
897 *bottom_index = active_best_quality;
899 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
902 vpx_clear_system_state();
904 // Limit Q range for the adaptive loop.
905 if (cm->frame_type == KEY_FRAME &&
906 !rc->this_key_frame_forced &&
907 !(cm->current_video_frame == 0)) {
908 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
909 active_worst_quality, 2.0,
911 } else if (!rc->is_src_frame_alt_ref &&
912 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
913 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
914 active_worst_quality, 1.75,
917 *top_index = active_worst_quality + qdelta;
918 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
922 if (oxcf->rc_mode == VPX_Q) {
923 q = active_best_quality;
924 // Special case code to try and match quality with forced key frames
925 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
926 q = rc->last_boosted_qindex;
928 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
929 active_best_quality, active_worst_quality);
930 if (q > *top_index) {
931 // Special case when we are targeting the max allowed rate
932 if (rc->this_frame_target >= rc->max_frame_bandwidth)
939 assert(*top_index <= rc->worst_quality &&
940 *top_index >= rc->best_quality);
941 assert(*bottom_index <= rc->worst_quality &&
942 *bottom_index >= rc->best_quality);
943 assert(q <= rc->worst_quality && q >= rc->best_quality);
947 int vp10_frame_type_qdelta(const VP10_COMP *cpi, int rf_level, int q) {
948 static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
949 1.00, // INTER_NORMAL
955 static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] =
956 {INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME};
957 const VP10_COMMON *const cm = &cpi->common;
958 int qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level],
959 q, rate_factor_deltas[rf_level],
964 #define STATIC_MOTION_THRESH 95
965 static int rc_pick_q_and_bounds_two_pass(const VP10_COMP *cpi,
968 const VP10_COMMON *const cm = &cpi->common;
969 const RATE_CONTROL *const rc = &cpi->rc;
970 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
971 const GF_GROUP *gf_group = &cpi->twopass.gf_group;
972 const int cq_level = get_active_cq_level(rc, oxcf);
973 int active_best_quality;
974 int active_worst_quality = cpi->twopass.active_worst_quality;
977 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
979 if (frame_is_intra_only(cm)) {
980 // Handle the special case for key frames forced when we have reached
981 // the maximum key frame interval. Here force the Q to a range
982 // based on the ambient Q to reduce the risk of popping.
983 if (rc->this_key_frame_forced) {
984 double last_boosted_q;
988 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
989 qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
990 active_best_quality = qindex;
991 last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
992 delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
993 last_boosted_q * 1.25,
995 active_worst_quality =
996 VPXMIN(qindex + delta_qindex, active_worst_quality);
998 qindex = rc->last_boosted_qindex;
999 last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
1000 delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
1001 last_boosted_q * 0.75,
1003 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
1006 // Not forced keyframe.
1007 double q_adj_factor = 1.0;
1009 // Baseline value derived from cpi->active_worst_quality and kf boost.
1010 active_best_quality = get_kf_active_quality(rc, active_worst_quality,
1013 // Allow somewhat lower kf minq with small image formats.
1014 if ((cm->width * cm->height) <= (352 * 288)) {
1015 q_adj_factor -= 0.25;
1018 // Make a further adjustment based on the kf zero motion measure.
1019 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
1021 // Convert the adjustment factor to a qindex delta
1022 // on active_best_quality.
1023 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
1024 active_best_quality += vp10_compute_qdelta(rc, q_val,
1025 q_val * q_adj_factor,
1028 } else if (!rc->is_src_frame_alt_ref &&
1029 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1030 // Use the lower of active_worst_quality and recent
1031 // average Q as basis for GF/ARF best Q limit unless last frame was
1033 if (rc->frames_since_key > 1 &&
1034 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
1035 q = rc->avg_frame_qindex[INTER_FRAME];
1037 q = active_worst_quality;
1039 // For constrained quality dont allow Q less than the cq level
1040 if (oxcf->rc_mode == VPX_CQ) {
1044 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1046 // Constrained quality use slightly lower active best.
1047 active_best_quality = active_best_quality * 15 / 16;
1049 } else if (oxcf->rc_mode == VPX_Q) {
1050 if (!cpi->refresh_alt_ref_frame) {
1051 active_best_quality = cq_level;
1053 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1055 // Modify best quality for second level arfs. For mode VPX_Q this
1056 // becomes the baseline frame q.
1057 if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
1058 active_best_quality = (active_best_quality + cq_level + 1) / 2;
1061 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1064 if (oxcf->rc_mode == VPX_Q) {
1065 active_best_quality = cq_level;
1067 active_best_quality = inter_minq[active_worst_quality];
1069 // For the constrained quality mode we don't want
1070 // q to fall below the cq level.
1071 if ((oxcf->rc_mode == VPX_CQ) &&
1072 (active_best_quality < cq_level)) {
1073 active_best_quality = cq_level;
1078 // Extension to max or min Q if undershoot or overshoot is outside
1079 // the permitted range.
1080 if ((cpi->oxcf.rc_mode != VPX_Q) &&
1081 (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) {
1082 if (frame_is_intra_only(cm) ||
1083 (!rc->is_src_frame_alt_ref &&
1084 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
1085 active_best_quality -=
1086 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
1087 active_worst_quality += (cpi->twopass.extend_maxq / 2);
1089 active_best_quality -=
1090 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
1091 active_worst_quality += cpi->twopass.extend_maxq;
1095 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
1096 vpx_clear_system_state();
1097 // Static forced key frames Q restrictions dealt with elsewhere.
1098 if (!(frame_is_intra_only(cm)) ||
1099 !rc->this_key_frame_forced ||
1100 (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
1101 int qdelta = vp10_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
1102 active_worst_quality);
1103 active_worst_quality = VPXMAX(active_worst_quality + qdelta,
1104 active_best_quality);
1108 // Modify active_best_quality for downscaled normal frames.
1109 if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
1110 int qdelta = vp10_compute_qdelta_by_rate(rc, cm->frame_type,
1111 active_best_quality, 2.0,
1113 active_best_quality =
1114 VPXMAX(active_best_quality + qdelta, rc->best_quality);
1117 active_best_quality = clamp(active_best_quality,
1118 rc->best_quality, rc->worst_quality);
1119 active_worst_quality = clamp(active_worst_quality,
1120 active_best_quality, rc->worst_quality);
1122 if (oxcf->rc_mode == VPX_Q) {
1123 q = active_best_quality;
1124 // Special case code to try and match quality with forced key frames.
1125 } else if (frame_is_intra_only(cm) && rc->this_key_frame_forced) {
1126 // If static since last kf use better of last boosted and last kf q.
1127 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1128 q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1130 q = rc->last_boosted_qindex;
1133 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
1134 active_best_quality, active_worst_quality);
1135 if (q > active_worst_quality) {
1136 // Special case when we are targeting the max allowed rate.
1137 if (rc->this_frame_target >= rc->max_frame_bandwidth)
1138 active_worst_quality = q;
1140 q = active_worst_quality;
1143 clamp(q, active_best_quality, active_worst_quality);
1145 *top_index = active_worst_quality;
1146 *bottom_index = active_best_quality;
1148 assert(*top_index <= rc->worst_quality &&
1149 *top_index >= rc->best_quality);
1150 assert(*bottom_index <= rc->worst_quality &&
1151 *bottom_index >= rc->best_quality);
1152 assert(q <= rc->worst_quality && q >= rc->best_quality);
1156 int vp10_rc_pick_q_and_bounds(const VP10_COMP *cpi,
1157 int *bottom_index, int *top_index) {
1159 if (cpi->oxcf.pass == 0) {
1160 if (cpi->oxcf.rc_mode == VPX_CBR)
1161 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
1163 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
1165 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
1171 void vp10_rc_compute_frame_size_bounds(const VP10_COMP *cpi,
1173 int *frame_under_shoot_limit,
1174 int *frame_over_shoot_limit) {
1175 if (cpi->oxcf.rc_mode == VPX_Q) {
1176 *frame_under_shoot_limit = 0;
1177 *frame_over_shoot_limit = INT_MAX;
1179 // For very small rate targets where the fractional adjustment
1180 // may be tiny make sure there is at least a minimum range.
1181 const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100;
1182 *frame_under_shoot_limit = VPXMAX(frame_target - tolerance - 200, 0);
1183 *frame_over_shoot_limit = VPXMIN(frame_target + tolerance + 200,
1184 cpi->rc.max_frame_bandwidth);
1188 void vp10_rc_set_frame_target(VP10_COMP *cpi, int target) {
1189 const VP10_COMMON *const cm = &cpi->common;
1190 RATE_CONTROL *const rc = &cpi->rc;
1192 rc->this_frame_target = target;
1194 // Modify frame size target when down-scaling.
1195 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
1196 rc->frame_size_selector != UNSCALED)
1197 rc->this_frame_target = (int)(rc->this_frame_target
1198 * rate_thresh_mult[rc->frame_size_selector]);
1200 // Target rate per SB64 (including partial SB64s.
1201 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1202 (cm->width * cm->height);
1205 static void update_alt_ref_frame_stats(VP10_COMP *cpi) {
1206 // this frame refreshes means next frames don't unless specified by user
1207 RATE_CONTROL *const rc = &cpi->rc;
1208 rc->frames_since_golden = 0;
1210 // Mark the alt ref as done (setting to 0 means no further alt refs pending).
1211 rc->source_alt_ref_pending = 0;
1213 // Set the alternate reference frame active flag
1214 rc->source_alt_ref_active = 1;
1217 static void update_golden_frame_stats(VP10_COMP *cpi) {
1218 RATE_CONTROL *const rc = &cpi->rc;
1220 // Update the Golden frame usage counts.
1221 if (cpi->refresh_golden_frame) {
1222 // this frame refreshes means next frames don't unless specified by user
1223 rc->frames_since_golden = 0;
1225 // If we are not using alt ref in the up and coming group clear the arf
1226 // active flag. In multi arf group case, if the index is not 0 then
1227 // we are overlaying a mid group arf so should not reset the flag.
1228 if (cpi->oxcf.pass == 2) {
1229 if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0))
1230 rc->source_alt_ref_active = 0;
1231 } else if (!rc->source_alt_ref_pending) {
1232 rc->source_alt_ref_active = 0;
1235 // Decrement count down till next gf
1236 if (rc->frames_till_gf_update_due > 0)
1237 rc->frames_till_gf_update_due--;
1239 } else if (!cpi->refresh_alt_ref_frame) {
1240 // Decrement count down till next gf
1241 if (rc->frames_till_gf_update_due > 0)
1242 rc->frames_till_gf_update_due--;
1244 rc->frames_since_golden++;
1248 void vp10_rc_postencode_update(VP10_COMP *cpi, uint64_t bytes_used) {
1249 const VP10_COMMON *const cm = &cpi->common;
1250 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1251 RATE_CONTROL *const rc = &cpi->rc;
1252 const int qindex = cm->base_qindex;
1254 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
1255 vp10_cyclic_refresh_postencode(cpi);
1258 // Update rate control heuristics
1259 rc->projected_frame_size = (int)(bytes_used << 3);
1261 // Post encode loop adjustment of Q prediction.
1262 vp10_rc_update_rate_correction_factors(cpi);
1264 // Keep a record of last Q and ambient average Q.
1265 if (cm->frame_type == KEY_FRAME) {
1266 rc->last_q[KEY_FRAME] = qindex;
1267 rc->avg_frame_qindex[KEY_FRAME] =
1268 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1270 if (!rc->is_src_frame_alt_ref &&
1271 !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1272 rc->last_q[INTER_FRAME] = qindex;
1273 rc->avg_frame_qindex[INTER_FRAME] =
1274 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1276 rc->tot_q += vp10_convert_qindex_to_q(qindex, cm->bit_depth);
1277 rc->avg_q = rc->tot_q / rc->ni_frames;
1278 // Calculate the average Q for normal inter frames (not key or GFU
1280 rc->ni_tot_qi += qindex;
1281 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1285 // Keep record of last boosted (KF/KF/ARF) Q value.
1286 // If the current frame is coded at a lower Q then we also update it.
1287 // If all mbs in this group are skipped only update if the Q value is
1288 // better than that already stored.
1289 // This is used to help set quality in forced key frames to reduce popping
1290 if ((qindex < rc->last_boosted_qindex) ||
1291 (cm->frame_type == KEY_FRAME) ||
1292 (!rc->constrained_gf_group &&
1293 (cpi->refresh_alt_ref_frame ||
1294 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1295 rc->last_boosted_qindex = qindex;
1297 if (cm->frame_type == KEY_FRAME)
1298 rc->last_kf_qindex = qindex;
1300 update_buffer_level(cpi, rc->projected_frame_size);
1302 // Rolling monitors of whether we are over or underspending used to help
1303 // regulate min and Max Q in two pass.
1304 if (cm->frame_type != KEY_FRAME) {
1305 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1306 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1307 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1308 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1309 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1310 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1311 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1312 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1315 // Actual bits spent
1316 rc->total_actual_bits += rc->projected_frame_size;
1317 rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
1319 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1321 if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame &&
1322 (cm->frame_type != KEY_FRAME))
1323 // Update the alternate reference frame stats as appropriate.
1324 update_alt_ref_frame_stats(cpi);
1326 // Update the Golden frame stats as appropriate.
1327 update_golden_frame_stats(cpi);
1329 if (cm->frame_type == KEY_FRAME)
1330 rc->frames_since_key = 0;
1331 if (cm->show_frame) {
1332 rc->frames_since_key++;
1333 rc->frames_to_key--;
1336 // Trigger the resizing of the next frame if it is scaled.
1337 if (oxcf->pass != 0) {
1338 cpi->resize_pending =
1339 rc->next_frame_size_selector != rc->frame_size_selector;
1340 rc->frame_size_selector = rc->next_frame_size_selector;
1344 void vp10_rc_postencode_update_drop_frame(VP10_COMP *cpi) {
1345 // Update buffer level with zero size, update frame counters, and return.
1346 update_buffer_level(cpi, 0);
1347 cpi->rc.frames_since_key++;
1348 cpi->rc.frames_to_key--;
1349 cpi->rc.rc_2_frame = 0;
1350 cpi->rc.rc_1_frame = 0;
1353 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1354 #define USE_ALTREF_FOR_ONE_PASS 1
1356 static int calc_pframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) {
1357 static const int af_ratio = 10;
1358 const RATE_CONTROL *const rc = &cpi->rc;
1360 #if USE_ALTREF_FOR_ONE_PASS
1361 target = (!rc->is_src_frame_alt_ref &&
1362 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1363 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1364 (rc->baseline_gf_interval + af_ratio - 1) :
1365 (rc->avg_frame_bandwidth * rc->baseline_gf_interval) /
1366 (rc->baseline_gf_interval + af_ratio - 1);
1368 target = rc->avg_frame_bandwidth;
1370 return vp10_rc_clamp_pframe_target_size(cpi, target);
1373 static int calc_iframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) {
1374 static const int kf_ratio = 25;
1375 const RATE_CONTROL *rc = &cpi->rc;
1376 const int target = rc->avg_frame_bandwidth * kf_ratio;
1377 return vp10_rc_clamp_iframe_target_size(cpi, target);
1380 void vp10_rc_get_one_pass_vbr_params(VP10_COMP *cpi) {
1381 VP10_COMMON *const cm = &cpi->common;
1382 RATE_CONTROL *const rc = &cpi->rc;
1384 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1385 if (!cpi->refresh_alt_ref_frame &&
1386 (cm->current_video_frame == 0 ||
1387 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1388 rc->frames_to_key == 0 ||
1389 (cpi->oxcf.auto_key && 0))) {
1390 cm->frame_type = KEY_FRAME;
1391 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1392 rc->frames_to_key == 0;
1393 rc->frames_to_key = cpi->oxcf.key_freq;
1394 rc->kf_boost = DEFAULT_KF_BOOST;
1395 rc->source_alt_ref_active = 0;
1397 cm->frame_type = INTER_FRAME;
1399 if (rc->frames_till_gf_update_due == 0) {
1400 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
1401 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1402 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1403 if (rc->frames_till_gf_update_due > rc->frames_to_key) {
1404 rc->frames_till_gf_update_due = rc->frames_to_key;
1405 rc->constrained_gf_group = 1;
1407 rc->constrained_gf_group = 0;
1409 cpi->refresh_golden_frame = 1;
1410 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1411 rc->gfu_boost = DEFAULT_GF_BOOST;
1413 if (cm->frame_type == KEY_FRAME)
1414 target = calc_iframe_target_size_one_pass_vbr(cpi);
1416 target = calc_pframe_target_size_one_pass_vbr(cpi);
1417 vp10_rc_set_frame_target(cpi, target);
1420 static int calc_pframe_target_size_one_pass_cbr(const VP10_COMP *cpi) {
1421 const VP10EncoderConfig *oxcf = &cpi->oxcf;
1422 const RATE_CONTROL *rc = &cpi->rc;
1423 const int64_t diff = rc->optimal_buffer_level - rc->buffer_level;
1424 const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100;
1425 int min_frame_target =
1426 VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS);
1429 if (oxcf->gf_cbr_boost_pct) {
1430 const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100;
1431 target = cpi->refresh_golden_frame ?
1432 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) /
1433 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) :
1434 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) /
1435 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100);
1437 target = rc->avg_frame_bandwidth;
1441 // Lower the target bandwidth for this frame.
1442 const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1443 target -= (target * pct_low) / 200;
1444 } else if (diff < 0) {
1445 // Increase the target bandwidth for this frame.
1446 const int pct_high =
1447 (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1448 target += (target * pct_high) / 200;
1450 if (oxcf->rc_max_inter_bitrate_pct) {
1451 const int max_rate = rc->avg_frame_bandwidth *
1452 oxcf->rc_max_inter_bitrate_pct / 100;
1453 target = VPXMIN(target, max_rate);
1455 return VPXMAX(min_frame_target, target);
1458 static int calc_iframe_target_size_one_pass_cbr(const VP10_COMP *cpi) {
1459 const RATE_CONTROL *rc = &cpi->rc;
1461 if (cpi->common.current_video_frame == 0) {
1462 target = ((rc->starting_buffer_level / 2) > INT_MAX)
1463 ? INT_MAX : (int)(rc->starting_buffer_level / 2);
1466 double framerate = cpi->framerate;
1468 kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16));
1469 if (rc->frames_since_key < framerate / 2) {
1470 kf_boost = (int)(kf_boost * rc->frames_since_key /
1473 target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4;
1475 return vp10_rc_clamp_iframe_target_size(cpi, target);
1478 void vp10_rc_get_one_pass_cbr_params(VP10_COMP *cpi) {
1479 VP10_COMMON *const cm = &cpi->common;
1480 RATE_CONTROL *const rc = &cpi->rc;
1482 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1483 if ((cm->current_video_frame == 0 ||
1484 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1485 rc->frames_to_key == 0 ||
1486 (cpi->oxcf.auto_key && 0))) {
1487 cm->frame_type = KEY_FRAME;
1488 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1489 rc->frames_to_key == 0;
1490 rc->frames_to_key = cpi->oxcf.key_freq;
1491 rc->kf_boost = DEFAULT_KF_BOOST;
1492 rc->source_alt_ref_active = 0;
1494 cm->frame_type = INTER_FRAME;
1496 if (rc->frames_till_gf_update_due == 0) {
1497 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1498 vp10_cyclic_refresh_set_golden_update(cpi);
1500 rc->baseline_gf_interval =
1501 (rc->min_gf_interval + rc->max_gf_interval) / 2;
1502 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1503 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1504 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1505 rc->frames_till_gf_update_due = rc->frames_to_key;
1506 cpi->refresh_golden_frame = 1;
1507 rc->gfu_boost = DEFAULT_GF_BOOST;
1510 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1511 // should be done here, before the frame qp is selected.
1512 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1513 vp10_cyclic_refresh_update_parameters(cpi);
1515 if (cm->frame_type == KEY_FRAME)
1516 target = calc_iframe_target_size_one_pass_cbr(cpi);
1518 target = calc_pframe_target_size_one_pass_cbr(cpi);
1520 vp10_rc_set_frame_target(cpi, target);
1521 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
1522 cpi->resize_pending = vp10_resize_one_pass_cbr(cpi);
1524 cpi->resize_pending = 0;
1527 int vp10_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
1528 vpx_bit_depth_t bit_depth) {
1529 int start_index = rc->worst_quality;
1530 int target_index = rc->worst_quality;
1533 // Convert the average q value to an index.
1534 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1536 if (vp10_convert_qindex_to_q(i, bit_depth) >= qstart)
1540 // Convert the q target to an index
1541 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1543 if (vp10_convert_qindex_to_q(i, bit_depth) >= qtarget)
1547 return target_index - start_index;
1550 int vp10_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1551 int qindex, double rate_target_ratio,
1552 vpx_bit_depth_t bit_depth) {
1553 int target_index = rc->worst_quality;
1556 // Look up the current projected bits per block for the base index
1557 const int base_bits_per_mb = vp10_rc_bits_per_mb(frame_type, qindex, 1.0,
1560 // Find the target bits per mb based on the base value and given ratio.
1561 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1563 // Convert the q target to an index
1564 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1565 if (vp10_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
1566 target_bits_per_mb) {
1571 return target_index - qindex;
1574 void vp10_rc_set_gf_interval_range(const VP10_COMP *const cpi,
1575 RATE_CONTROL *const rc) {
1576 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1578 // Special case code for 1 pass fixed Q mode tests
1579 if ((oxcf->pass == 0) && (oxcf->rc_mode == VPX_Q)) {
1580 rc->max_gf_interval = FIXED_GF_INTERVAL;
1581 rc->min_gf_interval = FIXED_GF_INTERVAL;
1582 rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL;
1584 // Set Maximum gf/arf interval
1585 rc->max_gf_interval = oxcf->max_gf_interval;
1586 rc->min_gf_interval = oxcf->min_gf_interval;
1587 if (rc->min_gf_interval == 0)
1588 rc->min_gf_interval = vp10_rc_get_default_min_gf_interval(
1589 oxcf->width, oxcf->height, cpi->framerate);
1590 if (rc->max_gf_interval == 0)
1591 rc->max_gf_interval = vp10_rc_get_default_max_gf_interval(
1592 cpi->framerate, rc->min_gf_interval);
1594 // Extended interval for genuinely static scenes
1595 rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;
1597 if (is_altref_enabled(cpi)) {
1598 if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
1599 rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
1602 if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
1603 rc->max_gf_interval = rc->static_scene_max_gf_interval;
1606 rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval);
1610 void vp10_rc_update_framerate(VP10_COMP *cpi) {
1611 const VP10_COMMON *const cm = &cpi->common;
1612 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1613 RATE_CONTROL *const rc = &cpi->rc;
1616 rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate);
1617 rc->min_frame_bandwidth = (int)(rc->avg_frame_bandwidth *
1618 oxcf->two_pass_vbrmin_section / 100);
1620 rc->min_frame_bandwidth =
1621 VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
1623 // A maximum bitrate for a frame is defined.
1624 // The baseline for this aligns with HW implementations that
1625 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
1626 // per 16x16 MB (averaged over a frame). However this limit is extended if
1627 // a very high rate is given on the command line or the the rate cannnot
1628 // be acheived because of a user specificed max q (e.g. when the user
1629 // specifies lossless encode.
1630 vbr_max_bits = (int)(((int64_t)rc->avg_frame_bandwidth *
1631 oxcf->two_pass_vbrmax_section) / 100);
1632 rc->max_frame_bandwidth =
1633 VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
1635 vp10_rc_set_gf_interval_range(cpi, rc);
1638 #define VBR_PCT_ADJUSTMENT_LIMIT 50
1639 // For VBR...adjustment to the frame target based on error from previous frames
1640 static void vbr_rate_correction(VP10_COMP *cpi, int *this_frame_target) {
1641 RATE_CONTROL *const rc = &cpi->rc;
1642 int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
1644 double position_factor = 1.0;
1646 // How far through the clip are we.
1647 // This number is used to damp the per frame rate correction.
1649 if (cpi->twopass.total_stats.count) {
1650 position_factor = sqrt((double)cpi->common.current_video_frame /
1651 cpi->twopass.total_stats.count);
1653 max_delta = (int)(position_factor *
1654 ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100));
1656 // vbr_bits_off_target > 0 means we have extra bits to spend
1657 if (vbr_bits_off_target > 0) {
1658 *this_frame_target +=
1659 (vbr_bits_off_target > max_delta) ? max_delta
1660 : (int)vbr_bits_off_target;
1662 *this_frame_target -=
1663 (vbr_bits_off_target < -max_delta) ? max_delta
1664 : (int)-vbr_bits_off_target;
1667 // Fast redistribution of bits arising from massive local undershoot.
1668 // Dont do it for kf,arf,gf or overlay frames.
1669 if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
1670 rc->vbr_bits_off_target_fast) {
1671 int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target);
1672 int fast_extra_bits;
1673 fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
1674 fast_extra_bits = (int)VPXMIN(
1676 VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
1677 *this_frame_target += (int)fast_extra_bits;
1678 rc->vbr_bits_off_target_fast -= fast_extra_bits;
1682 void vp10_set_target_rate(VP10_COMP *cpi) {
1683 RATE_CONTROL *const rc = &cpi->rc;
1684 int target_rate = rc->base_frame_target;
1686 // Correction to rate target based on prior over or under shoot.
1687 if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
1688 vbr_rate_correction(cpi, &target_rate);
1689 vp10_rc_set_frame_target(cpi, target_rate);
1692 // Check if we should resize, based on average QP from past x frames.
1693 // Only allow for resize at most one scale down for now, scaling factor is 2.
1694 int vp10_resize_one_pass_cbr(VP10_COMP *cpi) {
1695 const VP10_COMMON *const cm = &cpi->common;
1696 RATE_CONTROL *const rc = &cpi->rc;
1698 cpi->resize_scale_num = 1;
1699 cpi->resize_scale_den = 1;
1700 // Don't resize on key frame; reset the counters on key frame.
1701 if (cm->frame_type == KEY_FRAME) {
1702 cpi->resize_avg_qp = 0;
1703 cpi->resize_count = 0;
1706 // Resize based on average buffer underflow and QP over some window.
1707 // Ignore samples close to key frame, since QP is usually high after key.
1708 if (cpi->rc.frames_since_key > 2 * cpi->framerate) {
1709 const int window = (int)(5 * cpi->framerate);
1710 cpi->resize_avg_qp += cm->base_qindex;
1711 if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
1712 ++cpi->resize_buffer_underflow;
1713 ++cpi->resize_count;
1714 // Check for resize action every "window" frames.
1715 if (cpi->resize_count >= window) {
1716 int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
1717 // Resize down if buffer level has underflowed sufficent amount in past
1718 // window, and we are at original resolution.
1719 // Resize back up if average QP is low, and we are currently in a resized
1721 if (cpi->resize_state == 0 &&
1722 cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
1724 cpi->resize_state = 1;
1725 } else if (cpi->resize_state == 1 &&
1726 avg_qp < 40 * cpi->rc.worst_quality / 100) {
1728 cpi->resize_state = 0;
1730 // Reset for next window measurement.
1731 cpi->resize_avg_qp = 0;
1732 cpi->resize_count = 0;
1733 cpi->resize_buffer_underflow = 0;
1736 // If decision is to resize, reset some quantities, and check is we should
1737 // reduce rate correction factor,
1738 if (resize_now != 0) {
1739 int target_bits_per_frame;
1740 int active_worst_quality;
1742 int tot_scale_change;
1743 // For now, resize is by 1/2 x 1/2.
1744 cpi->resize_scale_num = 1;
1745 cpi->resize_scale_den = 2;
1746 tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
1747 (cpi->resize_scale_num * cpi->resize_scale_num);
1748 // Reset buffer level to optimal, update target size.
1749 rc->buffer_level = rc->optimal_buffer_level;
1750 rc->bits_off_target = rc->optimal_buffer_level;
1751 rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
1752 // Reset cyclic refresh parameters.
1753 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled)
1754 vp10_cyclic_refresh_reset_resize(cpi);
1755 // Get the projected qindex, based on the scaled target frame size (scaled
1756 // so target_bits_per_mb in vp10_rc_regulate_q will be correct target).
1757 target_bits_per_frame = (resize_now == 1) ?
1758 rc->this_frame_target * tot_scale_change :
1759 rc->this_frame_target / tot_scale_change;
1760 active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
1761 qindex = vp10_rc_regulate_q(cpi,
1762 target_bits_per_frame,
1764 active_worst_quality);
1765 // If resize is down, check if projected q index is close to worst_quality,
1766 // and if so, reduce the rate correction factor (since likely can afford
1767 // lower q for resized frame).
1768 if (resize_now == 1 &&
1769 qindex > 90 * cpi->rc.worst_quality / 100) {
1770 rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
1772 // If resize is back up, check if projected q index is too much above the
1773 // current base_qindex, and if so, reduce the rate correction factor
1774 // (since prefer to keep q for resized frame at least close to previous q).
1775 if (resize_now == -1 &&
1776 qindex > 130 * cm->base_qindex / 100) {
1777 rc->rate_correction_factors[INTER_NORMAL] *= 0.9;