2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
18 #include "vpx_mem/vpx_mem.h"
19 #include "vpx_ports/mem.h"
20 #include "vpx_ports/system_state.h"
22 #include "vp10/common/alloccommon.h"
23 #include "vp10/encoder/aq_cyclicrefresh.h"
24 #include "vp10/common/common.h"
25 #include "vp10/common/entropymode.h"
26 #include "vp10/common/quant_common.h"
27 #include "vp10/common/seg_common.h"
29 #include "vp10/encoder/encodemv.h"
30 #include "vp10/encoder/ratectrl.h"
32 // Max rate target for 1080P and below encodes under normal circumstances
33 // (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
34 #define MAX_MB_RATE 250
35 #define MAXRATE_1080P 2025000
37 #define DEFAULT_KF_BOOST 2000
38 #define DEFAULT_GF_BOOST 2000
40 #define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
42 #define MIN_BPB_FACTOR 0.005
43 #define MAX_BPB_FACTOR 50
45 #define FRAME_OVERHEAD_BITS 200
47 #if CONFIG_VP9_HIGHBITDEPTH
48 #define ASSIGN_MINQ_TABLE(bit_depth, name) \
50 switch (bit_depth) { \
61 assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10" \
67 #define ASSIGN_MINQ_TABLE(bit_depth, name) \
74 // Tables relating active max Q to active min Q
75 static int kf_low_motion_minq_8[QINDEX_RANGE];
76 static int kf_high_motion_minq_8[QINDEX_RANGE];
77 static int arfgf_low_motion_minq_8[QINDEX_RANGE];
78 static int arfgf_high_motion_minq_8[QINDEX_RANGE];
79 static int inter_minq_8[QINDEX_RANGE];
80 static int rtc_minq_8[QINDEX_RANGE];
82 #if CONFIG_VP9_HIGHBITDEPTH
83 static int kf_low_motion_minq_10[QINDEX_RANGE];
84 static int kf_high_motion_minq_10[QINDEX_RANGE];
85 static int arfgf_low_motion_minq_10[QINDEX_RANGE];
86 static int arfgf_high_motion_minq_10[QINDEX_RANGE];
87 static int inter_minq_10[QINDEX_RANGE];
88 static int rtc_minq_10[QINDEX_RANGE];
89 static int kf_low_motion_minq_12[QINDEX_RANGE];
90 static int kf_high_motion_minq_12[QINDEX_RANGE];
91 static int arfgf_low_motion_minq_12[QINDEX_RANGE];
92 static int arfgf_high_motion_minq_12[QINDEX_RANGE];
93 static int inter_minq_12[QINDEX_RANGE];
94 static int rtc_minq_12[QINDEX_RANGE];
97 static int gf_high = 2000;
98 static int gf_low = 400;
99 static int kf_high = 5000;
100 static int kf_low = 400;
102 // Functions to compute the active minq lookup table entries based on a
103 // formulaic approach to facilitate easier adjustment of the Q tables.
104 // The formulae were derived from computing a 3rd order polynomial best
105 // fit to the original data (after plotting real maxq vs minq (not q index))
106 static int get_minq_index(double maxq, double x3, double x2, double x1,
107 vpx_bit_depth_t bit_depth) {
109 const double minqtarget = VPXMIN(((x3 * maxq + x2) * maxq + x1) * maxq, maxq);
111 // Special case handling to deal with the step from q2.0
112 // down to lossless mode represented by q 1.0.
113 if (minqtarget <= 2.0)
116 for (i = 0; i < QINDEX_RANGE; i++) {
117 if (minqtarget <= vp10_convert_qindex_to_q(i, bit_depth))
121 return QINDEX_RANGE - 1;
124 static void init_minq_luts(int *kf_low_m, int *kf_high_m,
125 int *arfgf_low, int *arfgf_high,
126 int *inter, int *rtc, vpx_bit_depth_t bit_depth) {
128 for (i = 0; i < QINDEX_RANGE; i++) {
129 const double maxq = vp10_convert_qindex_to_q(i, bit_depth);
130 kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth);
131 kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
132 arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
133 arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
134 inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth);
135 rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
139 void vp10_rc_init_minq_luts(void) {
140 init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8,
141 arfgf_low_motion_minq_8, arfgf_high_motion_minq_8,
142 inter_minq_8, rtc_minq_8, VPX_BITS_8);
143 #if CONFIG_VP9_HIGHBITDEPTH
144 init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10,
145 arfgf_low_motion_minq_10, arfgf_high_motion_minq_10,
146 inter_minq_10, rtc_minq_10, VPX_BITS_10);
147 init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12,
148 arfgf_low_motion_minq_12, arfgf_high_motion_minq_12,
149 inter_minq_12, rtc_minq_12, VPX_BITS_12);
153 // These functions use formulaic calculations to make playing with the
154 // quantizer tables easier. If necessary they can be replaced by lookup
155 // tables if and when things settle down in the experimental bitstream
156 double vp10_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) {
157 // Convert the index to a real Q value (scaled down to match old Q values)
158 #if CONFIG_VP9_HIGHBITDEPTH
161 return vp10_ac_quant(qindex, 0, bit_depth) / 4.0;
163 return vp10_ac_quant(qindex, 0, bit_depth) / 16.0;
165 return vp10_ac_quant(qindex, 0, bit_depth) / 64.0;
167 assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12");
171 return vp10_ac_quant(qindex, 0, bit_depth) / 4.0;
175 int vp10_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
176 double correction_factor,
177 vpx_bit_depth_t bit_depth) {
178 const double q = vp10_convert_qindex_to_q(qindex, bit_depth);
179 int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000;
181 assert(correction_factor <= MAX_BPB_FACTOR &&
182 correction_factor >= MIN_BPB_FACTOR);
184 // q based adjustment to baseline enumerator
185 enumerator += (int)(enumerator * q) >> 12;
186 return (int)(enumerator * correction_factor / q);
189 int vp10_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
190 double correction_factor,
191 vpx_bit_depth_t bit_depth) {
192 const int bpm = (int)(vp10_rc_bits_per_mb(frame_type, q, correction_factor,
194 return VPXMAX(FRAME_OVERHEAD_BITS,
195 (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
198 int vp10_rc_clamp_pframe_target_size(const VP10_COMP *const cpi, int target) {
199 const RATE_CONTROL *rc = &cpi->rc;
200 const VP10EncoderConfig *oxcf = &cpi->oxcf;
201 const int min_frame_target = VPXMAX(rc->min_frame_bandwidth,
202 rc->avg_frame_bandwidth >> 5);
203 if (target < min_frame_target)
204 target = min_frame_target;
205 if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
206 // If there is an active ARF at this location use the minimum
207 // bits on this frame even if it is a constructed arf.
208 // The active maximum quantizer insures that an appropriate
209 // number of bits will be spent if needed for constructed ARFs.
210 target = min_frame_target;
212 // Clip the frame target to the maximum allowed value.
213 if (target > rc->max_frame_bandwidth)
214 target = rc->max_frame_bandwidth;
215 if (oxcf->rc_max_inter_bitrate_pct) {
216 const int max_rate = rc->avg_frame_bandwidth *
217 oxcf->rc_max_inter_bitrate_pct / 100;
218 target = VPXMIN(target, max_rate);
223 int vp10_rc_clamp_iframe_target_size(const VP10_COMP *const cpi, int target) {
224 const RATE_CONTROL *rc = &cpi->rc;
225 const VP10EncoderConfig *oxcf = &cpi->oxcf;
226 if (oxcf->rc_max_intra_bitrate_pct) {
227 const int max_rate = rc->avg_frame_bandwidth *
228 oxcf->rc_max_intra_bitrate_pct / 100;
229 target = VPXMIN(target, max_rate);
231 if (target > rc->max_frame_bandwidth)
232 target = rc->max_frame_bandwidth;
236 // Update the buffer level: leaky bucket model.
237 static void update_buffer_level(VP10_COMP *cpi, int encoded_frame_size) {
238 const VP10_COMMON *const cm = &cpi->common;
239 RATE_CONTROL *const rc = &cpi->rc;
241 // Non-viewable frames are a special case and are treated as pure overhead.
242 if (!cm->show_frame) {
243 rc->bits_off_target -= encoded_frame_size;
245 rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
248 // Clip the buffer level to the maximum specified buffer size.
249 rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size);
250 rc->buffer_level = rc->bits_off_target;
253 int vp10_rc_get_default_min_gf_interval(
254 int width, int height, double framerate) {
255 // Assume we do not need any constraint lower than 4K 20 fps
256 static const double factor_safe = 3840 * 2160 * 20.0;
257 const double factor = width * height * framerate;
258 const int default_interval =
259 clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL);
261 if (factor <= factor_safe)
262 return default_interval;
264 return VPXMAX(default_interval,
265 (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
266 // Note this logic makes:
272 int vp10_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) {
273 int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75));
274 interval += (interval & 0x01); // Round to even value
275 return VPXMAX(interval, min_gf_interval);
278 void vp10_rc_init(const VP10EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
281 if (pass == 0 && oxcf->rc_mode == VPX_CBR) {
282 rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
283 rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
285 rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q +
286 oxcf->best_allowed_q) / 2;
287 rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
288 oxcf->best_allowed_q) / 2;
291 rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
292 rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
294 rc->buffer_level = rc->starting_buffer_level;
295 rc->bits_off_target = rc->starting_buffer_level;
297 rc->rolling_target_bits = rc->avg_frame_bandwidth;
298 rc->rolling_actual_bits = rc->avg_frame_bandwidth;
299 rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
300 rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
302 rc->total_actual_bits = 0;
303 rc->total_target_bits = 0;
304 rc->total_target_vs_actual = 0;
306 rc->frames_since_key = 8; // Sensible default for first frame.
307 rc->this_key_frame_forced = 0;
308 rc->next_key_frame_forced = 0;
309 rc->source_alt_ref_pending = 0;
310 rc->source_alt_ref_active = 0;
312 rc->frames_till_gf_update_due = 0;
313 rc->ni_av_qi = oxcf->worst_allowed_q;
318 rc->avg_q = vp10_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
320 for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
321 rc->rate_correction_factors[i] = 1.0;
324 rc->min_gf_interval = oxcf->min_gf_interval;
325 rc->max_gf_interval = oxcf->max_gf_interval;
326 if (rc->min_gf_interval == 0)
327 rc->min_gf_interval = vp10_rc_get_default_min_gf_interval(
328 oxcf->width, oxcf->height, oxcf->init_framerate);
329 if (rc->max_gf_interval == 0)
330 rc->max_gf_interval = vp10_rc_get_default_max_gf_interval(
331 oxcf->init_framerate, rc->min_gf_interval);
332 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
335 int vp10_rc_drop_frame(VP10_COMP *cpi) {
336 const VP10EncoderConfig *oxcf = &cpi->oxcf;
337 RATE_CONTROL *const rc = &cpi->rc;
339 if (!oxcf->drop_frames_water_mark) {
342 if (rc->buffer_level < 0) {
343 // Always drop if buffer is below 0.
346 // If buffer is below drop_mark, for now just drop every other frame
347 // (starting with the next frame) until it increases back over drop_mark.
348 int drop_mark = (int)(oxcf->drop_frames_water_mark *
349 rc->optimal_buffer_level / 100);
350 if ((rc->buffer_level > drop_mark) &&
351 (rc->decimation_factor > 0)) {
352 --rc->decimation_factor;
353 } else if (rc->buffer_level <= drop_mark &&
354 rc->decimation_factor == 0) {
355 rc->decimation_factor = 1;
357 if (rc->decimation_factor > 0) {
358 if (rc->decimation_count > 0) {
359 --rc->decimation_count;
362 rc->decimation_count = rc->decimation_factor;
366 rc->decimation_count = 0;
373 static double get_rate_correction_factor(const VP10_COMP *cpi) {
374 const RATE_CONTROL *const rc = &cpi->rc;
377 if (cpi->common.frame_type == KEY_FRAME) {
378 rcf = rc->rate_correction_factors[KF_STD];
379 } else if (cpi->oxcf.pass == 2) {
380 RATE_FACTOR_LEVEL rf_lvl =
381 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
382 rcf = rc->rate_correction_factors[rf_lvl];
384 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
385 !rc->is_src_frame_alt_ref &&
386 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
387 rcf = rc->rate_correction_factors[GF_ARF_STD];
389 rcf = rc->rate_correction_factors[INTER_NORMAL];
391 rcf *= rcf_mult[rc->frame_size_selector];
392 return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
395 static void set_rate_correction_factor(VP10_COMP *cpi, double factor) {
396 RATE_CONTROL *const rc = &cpi->rc;
398 // Normalize RCF to account for the size-dependent scaling factor.
399 factor /= rcf_mult[cpi->rc.frame_size_selector];
401 factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
403 if (cpi->common.frame_type == KEY_FRAME) {
404 rc->rate_correction_factors[KF_STD] = factor;
405 } else if (cpi->oxcf.pass == 2) {
406 RATE_FACTOR_LEVEL rf_lvl =
407 cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
408 rc->rate_correction_factors[rf_lvl] = factor;
410 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
411 !rc->is_src_frame_alt_ref &&
412 (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
413 rc->rate_correction_factors[GF_ARF_STD] = factor;
415 rc->rate_correction_factors[INTER_NORMAL] = factor;
419 void vp10_rc_update_rate_correction_factors(VP10_COMP *cpi) {
420 const VP10_COMMON *const cm = &cpi->common;
421 int correction_factor = 100;
422 double rate_correction_factor = get_rate_correction_factor(cpi);
423 double adjustment_limit;
425 int projected_size_based_on_q = 0;
427 // Do not update the rate factors for arf overlay frames.
428 if (cpi->rc.is_src_frame_alt_ref)
431 // Clear down mmx registers to allow floating point in what follows
432 vpx_clear_system_state();
434 // Work out how big we would have expected the frame to be at this Q given
435 // the current correction factor.
436 // Stay in double to avoid int overflow when values are large
437 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) {
438 projected_size_based_on_q =
439 vp10_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
441 projected_size_based_on_q = vp10_estimate_bits_at_q(cpi->common.frame_type,
444 rate_correction_factor,
447 // Work out a size correction factor.
448 if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
449 correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) /
450 projected_size_based_on_q);
452 // More heavily damped adjustment used if we have been oscillating either side
454 adjustment_limit = 0.25 +
455 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor)));
457 cpi->rc.q_2_frame = cpi->rc.q_1_frame;
458 cpi->rc.q_1_frame = cm->base_qindex;
459 cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
460 if (correction_factor > 110)
461 cpi->rc.rc_1_frame = -1;
462 else if (correction_factor < 90)
463 cpi->rc.rc_1_frame = 1;
465 cpi->rc.rc_1_frame = 0;
467 if (correction_factor > 102) {
468 // We are not already at the worst allowable quality
469 correction_factor = (int)(100 + ((correction_factor - 100) *
471 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
472 // Keep rate_correction_factor within limits
473 if (rate_correction_factor > MAX_BPB_FACTOR)
474 rate_correction_factor = MAX_BPB_FACTOR;
475 } else if (correction_factor < 99) {
476 // We are not already at the best allowable quality
477 correction_factor = (int)(100 - ((100 - correction_factor) *
479 rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
481 // Keep rate_correction_factor within limits
482 if (rate_correction_factor < MIN_BPB_FACTOR)
483 rate_correction_factor = MIN_BPB_FACTOR;
486 set_rate_correction_factor(cpi, rate_correction_factor);
490 int vp10_rc_regulate_q(const VP10_COMP *cpi, int target_bits_per_frame,
491 int active_best_quality, int active_worst_quality) {
492 const VP10_COMMON *const cm = &cpi->common;
493 int q = active_worst_quality;
494 int last_error = INT_MAX;
495 int i, target_bits_per_mb, bits_per_mb_at_this_q;
496 const double correction_factor = get_rate_correction_factor(cpi);
498 // Calculate required scaling factor based on target frame size and size of
499 // frame produced using previous Q.
501 ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
503 i = active_best_quality;
506 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
507 bits_per_mb_at_this_q =
508 (int)vp10_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
510 bits_per_mb_at_this_q = (int)vp10_rc_bits_per_mb(cm->frame_type, i,
515 if (bits_per_mb_at_this_q <= target_bits_per_mb) {
516 if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
523 last_error = bits_per_mb_at_this_q - target_bits_per_mb;
525 } while (++i <= active_worst_quality);
527 // In CBR mode, this makes sure q is between oscillating Qs to prevent
529 if (cpi->oxcf.rc_mode == VPX_CBR &&
530 (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
531 cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
532 q = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
533 VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
538 static int get_active_quality(int q, int gfu_boost, int low, int high,
539 int *low_motion_minq, int *high_motion_minq) {
540 if (gfu_boost > high) {
541 return low_motion_minq[q];
542 } else if (gfu_boost < low) {
543 return high_motion_minq[q];
545 const int gap = high - low;
546 const int offset = high - gfu_boost;
547 const int qdiff = high_motion_minq[q] - low_motion_minq[q];
548 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
549 return low_motion_minq[q] + adjustment;
553 static int get_kf_active_quality(const RATE_CONTROL *const rc, int q,
554 vpx_bit_depth_t bit_depth) {
555 int *kf_low_motion_minq;
556 int *kf_high_motion_minq;
557 ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq);
558 ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq);
559 return get_active_quality(q, rc->kf_boost, kf_low, kf_high,
560 kf_low_motion_minq, kf_high_motion_minq);
563 static int get_gf_active_quality(const RATE_CONTROL *const rc, int q,
564 vpx_bit_depth_t bit_depth) {
565 int *arfgf_low_motion_minq;
566 int *arfgf_high_motion_minq;
567 ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq);
568 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
569 return get_active_quality(q, rc->gfu_boost, gf_low, gf_high,
570 arfgf_low_motion_minq, arfgf_high_motion_minq);
573 static int calc_active_worst_quality_one_pass_vbr(const VP10_COMP *cpi) {
574 const RATE_CONTROL *const rc = &cpi->rc;
575 const unsigned int curr_frame = cpi->common.current_video_frame;
576 int active_worst_quality;
578 if (cpi->common.frame_type == KEY_FRAME) {
579 active_worst_quality = curr_frame == 0 ? rc->worst_quality
580 : rc->last_q[KEY_FRAME] * 2;
582 if (!rc->is_src_frame_alt_ref &&
583 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
584 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
585 : rc->last_q[INTER_FRAME];
587 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
588 : rc->last_q[INTER_FRAME] * 2;
591 return VPXMIN(active_worst_quality, rc->worst_quality);
594 // Adjust active_worst_quality level based on buffer level.
595 static int calc_active_worst_quality_one_pass_cbr(const VP10_COMP *cpi) {
596 // Adjust active_worst_quality: If buffer is above the optimal/target level,
597 // bring active_worst_quality down depending on fullness of buffer.
598 // If buffer is below the optimal level, let the active_worst_quality go from
599 // ambient Q (at buffer = optimal level) to worst_quality level
600 // (at buffer = critical level).
601 const VP10_COMMON *const cm = &cpi->common;
602 const RATE_CONTROL *rc = &cpi->rc;
603 // Buffer level below which we push active_worst to worst_quality.
604 int64_t critical_level = rc->optimal_buffer_level >> 3;
605 int64_t buff_lvl_step = 0;
607 int active_worst_quality;
609 if (cm->frame_type == KEY_FRAME)
610 return rc->worst_quality;
611 // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME]
612 // for the first few frames following key frame. These are both initialized
613 // to worst_quality and updated with (3/4, 1/4) average in postencode_update.
614 // So for first few frames following key, the qp of that key frame is weighted
615 // into the active_worst_quality setting.
616 ambient_qp = (cm->current_video_frame < 5) ?
617 VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
618 rc->avg_frame_qindex[KEY_FRAME]) :
619 rc->avg_frame_qindex[INTER_FRAME];
620 active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4);
621 if (rc->buffer_level > rc->optimal_buffer_level) {
623 // Maximum limit for down adjustment, ~30%.
624 int max_adjustment_down = active_worst_quality / 3;
625 if (max_adjustment_down) {
626 buff_lvl_step = ((rc->maximum_buffer_size -
627 rc->optimal_buffer_level) / max_adjustment_down);
629 adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) /
631 active_worst_quality -= adjustment;
633 } else if (rc->buffer_level > critical_level) {
634 // Adjust up from ambient Q.
635 if (critical_level) {
636 buff_lvl_step = (rc->optimal_buffer_level - critical_level);
638 adjustment = (int)((rc->worst_quality - ambient_qp) *
639 (rc->optimal_buffer_level - rc->buffer_level) /
642 active_worst_quality = ambient_qp + adjustment;
645 // Set to worst_quality if buffer is below critical level.
646 active_worst_quality = rc->worst_quality;
648 return active_worst_quality;
651 static int rc_pick_q_and_bounds_one_pass_cbr(const VP10_COMP *cpi,
654 const VP10_COMMON *const cm = &cpi->common;
655 const RATE_CONTROL *const rc = &cpi->rc;
656 int active_best_quality;
657 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
660 ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq);
662 if (frame_is_intra_only(cm)) {
663 active_best_quality = rc->best_quality;
664 // Handle the special case for key frames forced when we have reached
665 // the maximum key frame interval. Here force the Q to a range
666 // based on the ambient Q to reduce the risk of popping.
667 if (rc->this_key_frame_forced) {
668 int qindex = rc->last_boosted_qindex;
669 double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
670 int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
671 (last_boosted_q * 0.75),
673 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
674 } else if (cm->current_video_frame > 0) {
675 // not first frame of one pass and kf_boost is set
676 double q_adj_factor = 1.0;
679 active_best_quality =
680 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
683 // Allow somewhat lower kf minq with small image formats.
684 if ((cm->width * cm->height) <= (352 * 288)) {
685 q_adj_factor -= 0.25;
688 // Convert the adjustment factor to a qindex delta
689 // on active_best_quality.
690 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
691 active_best_quality += vp10_compute_qdelta(rc, q_val,
692 q_val * q_adj_factor,
695 } else if (!rc->is_src_frame_alt_ref &&
696 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
697 // Use the lower of active_worst_quality and recent
698 // average Q as basis for GF/ARF best Q limit unless last frame was
700 if (rc->frames_since_key > 1 &&
701 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
702 q = rc->avg_frame_qindex[INTER_FRAME];
704 q = active_worst_quality;
706 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
708 // Use the lower of active_worst_quality and recent/average Q.
709 if (cm->current_video_frame > 1) {
710 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
711 active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]];
713 active_best_quality = rtc_minq[active_worst_quality];
715 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
716 active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]];
718 active_best_quality = rtc_minq[active_worst_quality];
722 // Clip the active best and worst quality values to limits
723 active_best_quality = clamp(active_best_quality,
724 rc->best_quality, rc->worst_quality);
725 active_worst_quality = clamp(active_worst_quality,
726 active_best_quality, rc->worst_quality);
728 *top_index = active_worst_quality;
729 *bottom_index = active_best_quality;
731 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
732 // Limit Q range for the adaptive loop.
733 if (cm->frame_type == KEY_FRAME &&
734 !rc->this_key_frame_forced &&
735 !(cm->current_video_frame == 0)) {
737 vpx_clear_system_state();
738 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
739 active_worst_quality, 2.0,
741 *top_index = active_worst_quality + qdelta;
742 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
746 // Special case code to try and match quality with forced key frames
747 if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
748 q = rc->last_boosted_qindex;
750 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
751 active_best_quality, active_worst_quality);
752 if (q > *top_index) {
753 // Special case when we are targeting the max allowed rate
754 if (rc->this_frame_target >= rc->max_frame_bandwidth)
760 assert(*top_index <= rc->worst_quality &&
761 *top_index >= rc->best_quality);
762 assert(*bottom_index <= rc->worst_quality &&
763 *bottom_index >= rc->best_quality);
764 assert(q <= rc->worst_quality && q >= rc->best_quality);
768 static int get_active_cq_level(const RATE_CONTROL *rc,
769 const VP10EncoderConfig *const oxcf) {
770 static const double cq_adjust_threshold = 0.1;
771 int active_cq_level = oxcf->cq_level;
772 if (oxcf->rc_mode == VPX_CQ &&
773 rc->total_target_bits > 0) {
774 const double x = (double)rc->total_actual_bits / rc->total_target_bits;
775 if (x < cq_adjust_threshold) {
776 active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold);
779 return active_cq_level;
782 static int rc_pick_q_and_bounds_one_pass_vbr(const VP10_COMP *cpi,
785 const VP10_COMMON *const cm = &cpi->common;
786 const RATE_CONTROL *const rc = &cpi->rc;
787 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
788 const int cq_level = get_active_cq_level(rc, oxcf);
789 int active_best_quality;
790 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
793 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
795 if (frame_is_intra_only(cm)) {
797 // Handle the special case for key frames forced when we have reached
798 // the maximum key frame interval. Here force the Q to a range
799 // based on the ambient Q to reduce the risk of popping.
800 if (rc->this_key_frame_forced) {
801 int qindex = rc->last_boosted_qindex;
802 double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
803 int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
804 last_boosted_q * 0.75,
806 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
808 // not first frame of one pass and kf_boost is set
809 double q_adj_factor = 1.0;
812 active_best_quality =
813 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME],
816 // Allow somewhat lower kf minq with small image formats.
817 if ((cm->width * cm->height) <= (352 * 288)) {
818 q_adj_factor -= 0.25;
821 // Convert the adjustment factor to a qindex delta
822 // on active_best_quality.
823 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
824 active_best_quality += vp10_compute_qdelta(rc, q_val,
825 q_val * q_adj_factor,
828 } else if (!rc->is_src_frame_alt_ref &&
829 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
830 // Use the lower of active_worst_quality and recent
831 // average Q as basis for GF/ARF best Q limit unless last frame was
833 if (rc->frames_since_key > 1 &&
834 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
835 q = rc->avg_frame_qindex[INTER_FRAME];
837 q = rc->avg_frame_qindex[KEY_FRAME];
839 // For constrained quality dont allow Q less than the cq level
840 if (oxcf->rc_mode == VPX_CQ) {
844 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
846 // Constrained quality use slightly lower active best.
847 active_best_quality = active_best_quality * 15 / 16;
849 } else if (oxcf->rc_mode == VPX_Q) {
850 if (!cpi->refresh_alt_ref_frame) {
851 active_best_quality = cq_level;
853 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
856 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
859 if (oxcf->rc_mode == VPX_Q) {
860 active_best_quality = cq_level;
862 // Use the lower of active_worst_quality and recent/average Q.
863 if (cm->current_video_frame > 1)
864 active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
866 active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
867 // For the constrained quality mode we don't want
868 // q to fall below the cq level.
869 if ((oxcf->rc_mode == VPX_CQ) &&
870 (active_best_quality < cq_level)) {
871 active_best_quality = cq_level;
876 // Clip the active best and worst quality values to limits
877 active_best_quality = clamp(active_best_quality,
878 rc->best_quality, rc->worst_quality);
879 active_worst_quality = clamp(active_worst_quality,
880 active_best_quality, rc->worst_quality);
882 *top_index = active_worst_quality;
883 *bottom_index = active_best_quality;
885 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
888 vpx_clear_system_state();
890 // Limit Q range for the adaptive loop.
891 if (cm->frame_type == KEY_FRAME &&
892 !rc->this_key_frame_forced &&
893 !(cm->current_video_frame == 0)) {
894 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
895 active_worst_quality, 2.0,
897 } else if (!rc->is_src_frame_alt_ref &&
898 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
899 qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
900 active_worst_quality, 1.75,
903 *top_index = active_worst_quality + qdelta;
904 *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
908 if (oxcf->rc_mode == VPX_Q) {
909 q = active_best_quality;
910 // Special case code to try and match quality with forced key frames
911 } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
912 q = rc->last_boosted_qindex;
914 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
915 active_best_quality, active_worst_quality);
916 if (q > *top_index) {
917 // Special case when we are targeting the max allowed rate
918 if (rc->this_frame_target >= rc->max_frame_bandwidth)
925 assert(*top_index <= rc->worst_quality &&
926 *top_index >= rc->best_quality);
927 assert(*bottom_index <= rc->worst_quality &&
928 *bottom_index >= rc->best_quality);
929 assert(q <= rc->worst_quality && q >= rc->best_quality);
933 int vp10_frame_type_qdelta(const VP10_COMP *cpi, int rf_level, int q) {
934 static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
935 1.00, // INTER_NORMAL
941 static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] =
942 {INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME};
943 const VP10_COMMON *const cm = &cpi->common;
944 int qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level],
945 q, rate_factor_deltas[rf_level],
950 #define STATIC_MOTION_THRESH 95
951 static int rc_pick_q_and_bounds_two_pass(const VP10_COMP *cpi,
954 const VP10_COMMON *const cm = &cpi->common;
955 const RATE_CONTROL *const rc = &cpi->rc;
956 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
957 const GF_GROUP *gf_group = &cpi->twopass.gf_group;
958 const int cq_level = get_active_cq_level(rc, oxcf);
959 int active_best_quality;
960 int active_worst_quality = cpi->twopass.active_worst_quality;
963 ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
965 if (frame_is_intra_only(cm)) {
966 // Handle the special case for key frames forced when we have reached
967 // the maximum key frame interval. Here force the Q to a range
968 // based on the ambient Q to reduce the risk of popping.
969 if (rc->this_key_frame_forced) {
970 double last_boosted_q;
974 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
975 qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
976 active_best_quality = qindex;
977 last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
978 delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
979 last_boosted_q * 1.25,
981 active_worst_quality =
982 VPXMIN(qindex + delta_qindex, active_worst_quality);
984 qindex = rc->last_boosted_qindex;
985 last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth);
986 delta_qindex = vp10_compute_qdelta(rc, last_boosted_q,
987 last_boosted_q * 0.75,
989 active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
992 // Not forced keyframe.
993 double q_adj_factor = 1.0;
995 // Baseline value derived from cpi->active_worst_quality and kf boost.
996 active_best_quality = get_kf_active_quality(rc, active_worst_quality,
999 // Allow somewhat lower kf minq with small image formats.
1000 if ((cm->width * cm->height) <= (352 * 288)) {
1001 q_adj_factor -= 0.25;
1004 // Make a further adjustment based on the kf zero motion measure.
1005 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
1007 // Convert the adjustment factor to a qindex delta
1008 // on active_best_quality.
1009 q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth);
1010 active_best_quality += vp10_compute_qdelta(rc, q_val,
1011 q_val * q_adj_factor,
1014 } else if (!rc->is_src_frame_alt_ref &&
1015 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1016 // Use the lower of active_worst_quality and recent
1017 // average Q as basis for GF/ARF best Q limit unless last frame was
1019 if (rc->frames_since_key > 1 &&
1020 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
1021 q = rc->avg_frame_qindex[INTER_FRAME];
1023 q = active_worst_quality;
1025 // For constrained quality dont allow Q less than the cq level
1026 if (oxcf->rc_mode == VPX_CQ) {
1030 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1032 // Constrained quality use slightly lower active best.
1033 active_best_quality = active_best_quality * 15 / 16;
1035 } else if (oxcf->rc_mode == VPX_Q) {
1036 if (!cpi->refresh_alt_ref_frame) {
1037 active_best_quality = cq_level;
1039 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1041 // Modify best quality for second level arfs. For mode VPX_Q this
1042 // becomes the baseline frame q.
1043 if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
1044 active_best_quality = (active_best_quality + cq_level + 1) / 2;
1047 active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
1050 if (oxcf->rc_mode == VPX_Q) {
1051 active_best_quality = cq_level;
1053 active_best_quality = inter_minq[active_worst_quality];
1055 // For the constrained quality mode we don't want
1056 // q to fall below the cq level.
1057 if ((oxcf->rc_mode == VPX_CQ) &&
1058 (active_best_quality < cq_level)) {
1059 active_best_quality = cq_level;
1064 // Extension to max or min Q if undershoot or overshoot is outside
1065 // the permitted range.
1066 if ((cpi->oxcf.rc_mode != VPX_Q) &&
1067 (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) {
1068 if (frame_is_intra_only(cm) ||
1069 (!rc->is_src_frame_alt_ref &&
1070 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
1071 active_best_quality -=
1072 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
1073 active_worst_quality += (cpi->twopass.extend_maxq / 2);
1075 active_best_quality -=
1076 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
1077 active_worst_quality += cpi->twopass.extend_maxq;
1081 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
1082 vpx_clear_system_state();
1083 // Static forced key frames Q restrictions dealt with elsewhere.
1084 if (!(frame_is_intra_only(cm)) ||
1085 !rc->this_key_frame_forced ||
1086 (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
1087 int qdelta = vp10_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
1088 active_worst_quality);
1089 active_worst_quality = VPXMAX(active_worst_quality + qdelta,
1090 active_best_quality);
1094 // Modify active_best_quality for downscaled normal frames.
1095 if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
1096 int qdelta = vp10_compute_qdelta_by_rate(rc, cm->frame_type,
1097 active_best_quality, 2.0,
1099 active_best_quality =
1100 VPXMAX(active_best_quality + qdelta, rc->best_quality);
1103 active_best_quality = clamp(active_best_quality,
1104 rc->best_quality, rc->worst_quality);
1105 active_worst_quality = clamp(active_worst_quality,
1106 active_best_quality, rc->worst_quality);
1108 if (oxcf->rc_mode == VPX_Q) {
1109 q = active_best_quality;
1110 // Special case code to try and match quality with forced key frames.
1111 } else if (frame_is_intra_only(cm) && rc->this_key_frame_forced) {
1112 // If static since last kf use better of last boosted and last kf q.
1113 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
1114 q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
1116 q = rc->last_boosted_qindex;
1119 q = vp10_rc_regulate_q(cpi, rc->this_frame_target,
1120 active_best_quality, active_worst_quality);
1121 if (q > active_worst_quality) {
1122 // Special case when we are targeting the max allowed rate.
1123 if (rc->this_frame_target >= rc->max_frame_bandwidth)
1124 active_worst_quality = q;
1126 q = active_worst_quality;
1129 clamp(q, active_best_quality, active_worst_quality);
1131 *top_index = active_worst_quality;
1132 *bottom_index = active_best_quality;
1134 assert(*top_index <= rc->worst_quality &&
1135 *top_index >= rc->best_quality);
1136 assert(*bottom_index <= rc->worst_quality &&
1137 *bottom_index >= rc->best_quality);
1138 assert(q <= rc->worst_quality && q >= rc->best_quality);
1142 int vp10_rc_pick_q_and_bounds(const VP10_COMP *cpi,
1143 int *bottom_index, int *top_index) {
1145 if (cpi->oxcf.pass == 0) {
1146 if (cpi->oxcf.rc_mode == VPX_CBR)
1147 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
1149 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
1151 q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
1157 void vp10_rc_compute_frame_size_bounds(const VP10_COMP *cpi,
1159 int *frame_under_shoot_limit,
1160 int *frame_over_shoot_limit) {
1161 if (cpi->oxcf.rc_mode == VPX_Q) {
1162 *frame_under_shoot_limit = 0;
1163 *frame_over_shoot_limit = INT_MAX;
1165 // For very small rate targets where the fractional adjustment
1166 // may be tiny make sure there is at least a minimum range.
1167 const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100;
1168 *frame_under_shoot_limit = VPXMAX(frame_target - tolerance - 200, 0);
1169 *frame_over_shoot_limit = VPXMIN(frame_target + tolerance + 200,
1170 cpi->rc.max_frame_bandwidth);
1174 void vp10_rc_set_frame_target(VP10_COMP *cpi, int target) {
1175 const VP10_COMMON *const cm = &cpi->common;
1176 RATE_CONTROL *const rc = &cpi->rc;
1178 rc->this_frame_target = target;
1180 // Modify frame size target when down-scaling.
1181 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
1182 rc->frame_size_selector != UNSCALED)
1183 rc->this_frame_target = (int)(rc->this_frame_target
1184 * rate_thresh_mult[rc->frame_size_selector]);
1186 // Target rate per SB64 (including partial SB64s.
1187 rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) /
1188 (cm->width * cm->height);
1191 static void update_alt_ref_frame_stats(VP10_COMP *cpi) {
1192 // this frame refreshes means next frames don't unless specified by user
1193 RATE_CONTROL *const rc = &cpi->rc;
1194 rc->frames_since_golden = 0;
1196 // Mark the alt ref as done (setting to 0 means no further alt refs pending).
1197 rc->source_alt_ref_pending = 0;
1199 // Set the alternate reference frame active flag
1200 rc->source_alt_ref_active = 1;
1203 static void update_golden_frame_stats(VP10_COMP *cpi) {
1204 RATE_CONTROL *const rc = &cpi->rc;
1206 // Update the Golden frame usage counts.
1207 if (cpi->refresh_golden_frame) {
1208 // this frame refreshes means next frames don't unless specified by user
1209 rc->frames_since_golden = 0;
1211 // If we are not using alt ref in the up and coming group clear the arf
1213 if (!rc->source_alt_ref_pending) {
1214 rc->source_alt_ref_active = 0;
1217 // Decrement count down till next gf
1218 if (rc->frames_till_gf_update_due > 0)
1219 rc->frames_till_gf_update_due--;
1221 } else if (!cpi->refresh_alt_ref_frame) {
1222 // Decrement count down till next gf
1223 if (rc->frames_till_gf_update_due > 0)
1224 rc->frames_till_gf_update_due--;
1226 rc->frames_since_golden++;
1230 void vp10_rc_postencode_update(VP10_COMP *cpi, uint64_t bytes_used) {
1231 const VP10_COMMON *const cm = &cpi->common;
1232 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1233 RATE_CONTROL *const rc = &cpi->rc;
1234 const int qindex = cm->base_qindex;
1236 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
1237 vp10_cyclic_refresh_postencode(cpi);
1240 // Update rate control heuristics
1241 rc->projected_frame_size = (int)(bytes_used << 3);
1243 // Post encode loop adjustment of Q prediction.
1244 vp10_rc_update_rate_correction_factors(cpi);
1246 // Keep a record of last Q and ambient average Q.
1247 if (cm->frame_type == KEY_FRAME) {
1248 rc->last_q[KEY_FRAME] = qindex;
1249 rc->avg_frame_qindex[KEY_FRAME] =
1250 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
1252 if (rc->is_src_frame_alt_ref ||
1253 !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
1254 rc->last_q[INTER_FRAME] = qindex;
1255 rc->avg_frame_qindex[INTER_FRAME] =
1256 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
1258 rc->tot_q += vp10_convert_qindex_to_q(qindex, cm->bit_depth);
1259 rc->avg_q = rc->tot_q / rc->ni_frames;
1260 // Calculate the average Q for normal inter frames (not key or GFU
1262 rc->ni_tot_qi += qindex;
1263 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
1267 // Keep record of last boosted (KF/KF/ARF) Q value.
1268 // If the current frame is coded at a lower Q then we also update it.
1269 // If all mbs in this group are skipped only update if the Q value is
1270 // better than that already stored.
1271 // This is used to help set quality in forced key frames to reduce popping
1272 if ((qindex < rc->last_boosted_qindex) ||
1273 (cm->frame_type == KEY_FRAME) ||
1274 (!rc->constrained_gf_group &&
1275 (cpi->refresh_alt_ref_frame ||
1276 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
1277 rc->last_boosted_qindex = qindex;
1279 if (cm->frame_type == KEY_FRAME)
1280 rc->last_kf_qindex = qindex;
1282 update_buffer_level(cpi, rc->projected_frame_size);
1284 // Rolling monitors of whether we are over or underspending used to help
1285 // regulate min and Max Q in two pass.
1286 if (cm->frame_type != KEY_FRAME) {
1287 rc->rolling_target_bits = ROUND_POWER_OF_TWO(
1288 rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
1289 rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
1290 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
1291 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
1292 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
1293 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
1294 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
1297 // Actual bits spent
1298 rc->total_actual_bits += rc->projected_frame_size;
1299 rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
1301 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
1303 if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame &&
1304 (cm->frame_type != KEY_FRAME))
1305 // Update the alternate reference frame stats as appropriate.
1306 update_alt_ref_frame_stats(cpi);
1308 // Update the Golden frame stats as appropriate.
1309 update_golden_frame_stats(cpi);
1311 if (cm->frame_type == KEY_FRAME)
1312 rc->frames_since_key = 0;
1313 if (cm->show_frame) {
1314 rc->frames_since_key++;
1315 rc->frames_to_key--;
1318 // Trigger the resizing of the next frame if it is scaled.
1319 if (oxcf->pass != 0) {
1320 cpi->resize_pending =
1321 rc->next_frame_size_selector != rc->frame_size_selector;
1322 rc->frame_size_selector = rc->next_frame_size_selector;
1326 void vp10_rc_postencode_update_drop_frame(VP10_COMP *cpi) {
1327 // Update buffer level with zero size, update frame counters, and return.
1328 update_buffer_level(cpi, 0);
1329 cpi->rc.frames_since_key++;
1330 cpi->rc.frames_to_key--;
1331 cpi->rc.rc_2_frame = 0;
1332 cpi->rc.rc_1_frame = 0;
1335 // Use this macro to turn on/off use of alt-refs in one-pass mode.
1336 #define USE_ALTREF_FOR_ONE_PASS 1
1338 static int calc_pframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) {
1339 static const int af_ratio = 10;
1340 const RATE_CONTROL *const rc = &cpi->rc;
1342 #if USE_ALTREF_FOR_ONE_PASS
1343 target = (!rc->is_src_frame_alt_ref &&
1344 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ?
1345 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
1346 (rc->baseline_gf_interval + af_ratio - 1) :
1347 (rc->avg_frame_bandwidth * rc->baseline_gf_interval) /
1348 (rc->baseline_gf_interval + af_ratio - 1);
1350 target = rc->avg_frame_bandwidth;
1352 return vp10_rc_clamp_pframe_target_size(cpi, target);
1355 static int calc_iframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) {
1356 static const int kf_ratio = 25;
1357 const RATE_CONTROL *rc = &cpi->rc;
1358 const int target = rc->avg_frame_bandwidth * kf_ratio;
1359 return vp10_rc_clamp_iframe_target_size(cpi, target);
1362 void vp10_rc_get_one_pass_vbr_params(VP10_COMP *cpi) {
1363 VP10_COMMON *const cm = &cpi->common;
1364 RATE_CONTROL *const rc = &cpi->rc;
1366 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1367 if (!cpi->refresh_alt_ref_frame &&
1368 (cm->current_video_frame == 0 ||
1369 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1370 rc->frames_to_key == 0 ||
1371 (cpi->oxcf.auto_key && 0))) {
1372 cm->frame_type = KEY_FRAME;
1373 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1374 rc->frames_to_key == 0;
1375 rc->frames_to_key = cpi->oxcf.key_freq;
1376 rc->kf_boost = DEFAULT_KF_BOOST;
1377 rc->source_alt_ref_active = 0;
1379 cm->frame_type = INTER_FRAME;
1381 if (rc->frames_till_gf_update_due == 0) {
1382 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
1383 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1384 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1385 if (rc->frames_till_gf_update_due > rc->frames_to_key) {
1386 rc->frames_till_gf_update_due = rc->frames_to_key;
1387 rc->constrained_gf_group = 1;
1389 rc->constrained_gf_group = 0;
1391 cpi->refresh_golden_frame = 1;
1392 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
1393 rc->gfu_boost = DEFAULT_GF_BOOST;
1395 if (cm->frame_type == KEY_FRAME)
1396 target = calc_iframe_target_size_one_pass_vbr(cpi);
1398 target = calc_pframe_target_size_one_pass_vbr(cpi);
1399 vp10_rc_set_frame_target(cpi, target);
1402 static int calc_pframe_target_size_one_pass_cbr(const VP10_COMP *cpi) {
1403 const VP10EncoderConfig *oxcf = &cpi->oxcf;
1404 const RATE_CONTROL *rc = &cpi->rc;
1405 const int64_t diff = rc->optimal_buffer_level - rc->buffer_level;
1406 const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100;
1407 int min_frame_target =
1408 VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS);
1411 if (oxcf->gf_cbr_boost_pct) {
1412 const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100;
1413 target = cpi->refresh_golden_frame ?
1414 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) /
1415 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) :
1416 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) /
1417 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100);
1419 target = rc->avg_frame_bandwidth;
1423 // Lower the target bandwidth for this frame.
1424 const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct);
1425 target -= (target * pct_low) / 200;
1426 } else if (diff < 0) {
1427 // Increase the target bandwidth for this frame.
1428 const int pct_high =
1429 (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
1430 target += (target * pct_high) / 200;
1432 if (oxcf->rc_max_inter_bitrate_pct) {
1433 const int max_rate = rc->avg_frame_bandwidth *
1434 oxcf->rc_max_inter_bitrate_pct / 100;
1435 target = VPXMIN(target, max_rate);
1437 return VPXMAX(min_frame_target, target);
1440 static int calc_iframe_target_size_one_pass_cbr(const VP10_COMP *cpi) {
1441 const RATE_CONTROL *rc = &cpi->rc;
1443 if (cpi->common.current_video_frame == 0) {
1444 target = ((rc->starting_buffer_level / 2) > INT_MAX)
1445 ? INT_MAX : (int)(rc->starting_buffer_level / 2);
1448 double framerate = cpi->framerate;
1450 kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16));
1451 if (rc->frames_since_key < framerate / 2) {
1452 kf_boost = (int)(kf_boost * rc->frames_since_key /
1455 target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4;
1457 return vp10_rc_clamp_iframe_target_size(cpi, target);
1460 void vp10_rc_get_one_pass_cbr_params(VP10_COMP *cpi) {
1461 VP10_COMMON *const cm = &cpi->common;
1462 RATE_CONTROL *const rc = &cpi->rc;
1464 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
1465 if ((cm->current_video_frame == 0 ||
1466 (cpi->frame_flags & FRAMEFLAGS_KEY) ||
1467 rc->frames_to_key == 0 ||
1468 (cpi->oxcf.auto_key && 0))) {
1469 cm->frame_type = KEY_FRAME;
1470 rc->this_key_frame_forced = cm->current_video_frame != 0 &&
1471 rc->frames_to_key == 0;
1472 rc->frames_to_key = cpi->oxcf.key_freq;
1473 rc->kf_boost = DEFAULT_KF_BOOST;
1474 rc->source_alt_ref_active = 0;
1476 cm->frame_type = INTER_FRAME;
1478 if (rc->frames_till_gf_update_due == 0) {
1479 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1480 vp10_cyclic_refresh_set_golden_update(cpi);
1482 rc->baseline_gf_interval =
1483 (rc->min_gf_interval + rc->max_gf_interval) / 2;
1484 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
1485 // NOTE: frames_till_gf_update_due must be <= frames_to_key.
1486 if (rc->frames_till_gf_update_due > rc->frames_to_key)
1487 rc->frames_till_gf_update_due = rc->frames_to_key;
1488 cpi->refresh_golden_frame = 1;
1489 rc->gfu_boost = DEFAULT_GF_BOOST;
1492 // Any update/change of global cyclic refresh parameters (amount/delta-qp)
1493 // should be done here, before the frame qp is selected.
1494 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
1495 vp10_cyclic_refresh_update_parameters(cpi);
1497 if (cm->frame_type == KEY_FRAME)
1498 target = calc_iframe_target_size_one_pass_cbr(cpi);
1500 target = calc_pframe_target_size_one_pass_cbr(cpi);
1502 vp10_rc_set_frame_target(cpi, target);
1503 if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
1504 cpi->resize_pending = vp10_resize_one_pass_cbr(cpi);
1506 cpi->resize_pending = 0;
1509 int vp10_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
1510 vpx_bit_depth_t bit_depth) {
1511 int start_index = rc->worst_quality;
1512 int target_index = rc->worst_quality;
1515 // Convert the average q value to an index.
1516 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1518 if (vp10_convert_qindex_to_q(i, bit_depth) >= qstart)
1522 // Convert the q target to an index
1523 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1525 if (vp10_convert_qindex_to_q(i, bit_depth) >= qtarget)
1529 return target_index - start_index;
1532 int vp10_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
1533 int qindex, double rate_target_ratio,
1534 vpx_bit_depth_t bit_depth) {
1535 int target_index = rc->worst_quality;
1538 // Look up the current projected bits per block for the base index
1539 const int base_bits_per_mb = vp10_rc_bits_per_mb(frame_type, qindex, 1.0,
1542 // Find the target bits per mb based on the base value and given ratio.
1543 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
1545 // Convert the q target to an index
1546 for (i = rc->best_quality; i < rc->worst_quality; ++i) {
1547 if (vp10_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
1548 target_bits_per_mb) {
1553 return target_index - qindex;
1556 void vp10_rc_set_gf_interval_range(const VP10_COMP *const cpi,
1557 RATE_CONTROL *const rc) {
1558 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1560 // Set Maximum gf/arf interval
1561 rc->max_gf_interval = oxcf->max_gf_interval;
1562 rc->min_gf_interval = oxcf->min_gf_interval;
1563 if (rc->min_gf_interval == 0)
1564 rc->min_gf_interval = vp10_rc_get_default_min_gf_interval(
1565 oxcf->width, oxcf->height, cpi->framerate);
1566 if (rc->max_gf_interval == 0)
1567 rc->max_gf_interval = vp10_rc_get_default_max_gf_interval(
1568 cpi->framerate, rc->min_gf_interval);
1570 // Extended interval for genuinely static scenes
1571 rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;
1573 if (is_altref_enabled(cpi)) {
1574 if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
1575 rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
1578 if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
1579 rc->max_gf_interval = rc->static_scene_max_gf_interval;
1582 rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval);
1585 void vp10_rc_update_framerate(VP10_COMP *cpi) {
1586 const VP10_COMMON *const cm = &cpi->common;
1587 const VP10EncoderConfig *const oxcf = &cpi->oxcf;
1588 RATE_CONTROL *const rc = &cpi->rc;
1591 rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate);
1592 rc->min_frame_bandwidth = (int)(rc->avg_frame_bandwidth *
1593 oxcf->two_pass_vbrmin_section / 100);
1595 rc->min_frame_bandwidth =
1596 VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
1598 // A maximum bitrate for a frame is defined.
1599 // The baseline for this aligns with HW implementations that
1600 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
1601 // per 16x16 MB (averaged over a frame). However this limit is extended if
1602 // a very high rate is given on the command line or the the rate cannnot
1603 // be acheived because of a user specificed max q (e.g. when the user
1604 // specifies lossless encode.
1605 vbr_max_bits = (int)(((int64_t)rc->avg_frame_bandwidth *
1606 oxcf->two_pass_vbrmax_section) / 100);
1607 rc->max_frame_bandwidth =
1608 VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
1610 vp10_rc_set_gf_interval_range(cpi, rc);
1613 #define VBR_PCT_ADJUSTMENT_LIMIT 50
1614 // For VBR...adjustment to the frame target based on error from previous frames
1615 static void vbr_rate_correction(VP10_COMP *cpi, int *this_frame_target) {
1616 RATE_CONTROL *const rc = &cpi->rc;
1617 int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
1619 double position_factor = 1.0;
1621 // How far through the clip are we.
1622 // This number is used to damp the per frame rate correction.
1624 if (cpi->twopass.total_stats.count) {
1625 position_factor = sqrt((double)cpi->common.current_video_frame /
1626 cpi->twopass.total_stats.count);
1628 max_delta = (int)(position_factor *
1629 ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100));
1631 // vbr_bits_off_target > 0 means we have extra bits to spend
1632 if (vbr_bits_off_target > 0) {
1633 *this_frame_target +=
1634 (vbr_bits_off_target > max_delta) ? max_delta
1635 : (int)vbr_bits_off_target;
1637 *this_frame_target -=
1638 (vbr_bits_off_target < -max_delta) ? max_delta
1639 : (int)-vbr_bits_off_target;
1642 // Fast redistribution of bits arising from massive local undershoot.
1643 // Dont do it for kf,arf,gf or overlay frames.
1644 if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
1645 rc->vbr_bits_off_target_fast) {
1646 int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target);
1647 int fast_extra_bits;
1648 fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
1649 fast_extra_bits = (int)VPXMIN(
1651 VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
1652 *this_frame_target += (int)fast_extra_bits;
1653 rc->vbr_bits_off_target_fast -= fast_extra_bits;
1657 void vp10_set_target_rate(VP10_COMP *cpi) {
1658 RATE_CONTROL *const rc = &cpi->rc;
1659 int target_rate = rc->base_frame_target;
1661 // Correction to rate target based on prior over or under shoot.
1662 if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
1663 vbr_rate_correction(cpi, &target_rate);
1664 vp10_rc_set_frame_target(cpi, target_rate);
1667 // Check if we should resize, based on average QP from past x frames.
1668 // Only allow for resize at most one scale down for now, scaling factor is 2.
1669 int vp10_resize_one_pass_cbr(VP10_COMP *cpi) {
1670 const VP10_COMMON *const cm = &cpi->common;
1671 RATE_CONTROL *const rc = &cpi->rc;
1673 cpi->resize_scale_num = 1;
1674 cpi->resize_scale_den = 1;
1675 // Don't resize on key frame; reset the counters on key frame.
1676 if (cm->frame_type == KEY_FRAME) {
1677 cpi->resize_avg_qp = 0;
1678 cpi->resize_count = 0;
1681 // Resize based on average buffer underflow and QP over some window.
1682 // Ignore samples close to key frame, since QP is usually high after key.
1683 if (cpi->rc.frames_since_key > 2 * cpi->framerate) {
1684 const int window = (int)(5 * cpi->framerate);
1685 cpi->resize_avg_qp += cm->base_qindex;
1686 if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
1687 ++cpi->resize_buffer_underflow;
1688 ++cpi->resize_count;
1689 // Check for resize action every "window" frames.
1690 if (cpi->resize_count >= window) {
1691 int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
1692 // Resize down if buffer level has underflowed sufficent amount in past
1693 // window, and we are at original resolution.
1694 // Resize back up if average QP is low, and we are currently in a resized
1696 if (cpi->resize_state == 0 &&
1697 cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
1699 cpi->resize_state = 1;
1700 } else if (cpi->resize_state == 1 &&
1701 avg_qp < 40 * cpi->rc.worst_quality / 100) {
1703 cpi->resize_state = 0;
1705 // Reset for next window measurement.
1706 cpi->resize_avg_qp = 0;
1707 cpi->resize_count = 0;
1708 cpi->resize_buffer_underflow = 0;
1711 // If decision is to resize, reset some quantities, and check is we should
1712 // reduce rate correction factor,
1713 if (resize_now != 0) {
1714 int target_bits_per_frame;
1715 int active_worst_quality;
1717 int tot_scale_change;
1718 // For now, resize is by 1/2 x 1/2.
1719 cpi->resize_scale_num = 1;
1720 cpi->resize_scale_den = 2;
1721 tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
1722 (cpi->resize_scale_num * cpi->resize_scale_num);
1723 // Reset buffer level to optimal, update target size.
1724 rc->buffer_level = rc->optimal_buffer_level;
1725 rc->bits_off_target = rc->optimal_buffer_level;
1726 rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
1727 // Reset cyclic refresh parameters.
1728 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled)
1729 vp10_cyclic_refresh_reset_resize(cpi);
1730 // Get the projected qindex, based on the scaled target frame size (scaled
1731 // so target_bits_per_mb in vp10_rc_regulate_q will be correct target).
1732 target_bits_per_frame = (resize_now == 1) ?
1733 rc->this_frame_target * tot_scale_change :
1734 rc->this_frame_target / tot_scale_change;
1735 active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
1736 qindex = vp10_rc_regulate_q(cpi,
1737 target_bits_per_frame,
1739 active_worst_quality);
1740 // If resize is down, check if projected q index is close to worst_quality,
1741 // and if so, reduce the rate correction factor (since likely can afford
1742 // lower q for resized frame).
1743 if (resize_now == 1 &&
1744 qindex > 90 * cpi->rc.worst_quality / 100) {
1745 rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
1747 // If resize is back up, check if projected q index is too much above the
1748 // current base_qindex, and if so, reduce the rate correction factor
1749 // (since prefer to keep q for resized frame at least close to previous q).
1750 if (resize_now == -1 &&
1751 qindex > 130 * cm->base_qindex / 100) {
1752 rc->rate_correction_factors[INTER_NORMAL] *= 0.9;