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Diffstat (limited to 'vp10/encoder/ratectrl.c')
| -rw-r--r-- | vp10/encoder/ratectrl.c | 1781 |
1 files changed, 0 insertions, 1781 deletions
diff --git a/vp10/encoder/ratectrl.c b/vp10/encoder/ratectrl.c deleted file mode 100644 index 606877594..000000000 --- a/vp10/encoder/ratectrl.c +++ /dev/null @@ -1,1781 +0,0 @@ -/* - * Copyright (c) 2010 The WebM project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ - -#include <assert.h> -#include <limits.h> -#include <math.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "vpx_dsp/vpx_dsp_common.h" -#include "vpx_mem/vpx_mem.h" -#include "vpx_ports/mem.h" -#include "vpx_ports/system_state.h" - -#include "vp10/common/alloccommon.h" -#include "vp10/encoder/aq_cyclicrefresh.h" -#include "vp10/common/common.h" -#include "vp10/common/entropymode.h" -#include "vp10/common/quant_common.h" -#include "vp10/common/seg_common.h" - -#include "vp10/encoder/encodemv.h" -#include "vp10/encoder/ratectrl.h" - -// Max rate target for 1080P and below encodes under normal circumstances -// (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB -#define MAX_MB_RATE 250 -#define MAXRATE_1080P 2025000 - -#define DEFAULT_KF_BOOST 2000 -#define DEFAULT_GF_BOOST 2000 - -#define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1 - -#define MIN_BPB_FACTOR 0.005 -#define MAX_BPB_FACTOR 50 - -#define FRAME_OVERHEAD_BITS 200 - -#if CONFIG_VP9_HIGHBITDEPTH -#define ASSIGN_MINQ_TABLE(bit_depth, name) \ - do { \ - switch (bit_depth) { \ - case VPX_BITS_8: \ - name = name##_8; \ - break; \ - case VPX_BITS_10: \ - name = name##_10; \ - break; \ - case VPX_BITS_12: \ - name = name##_12; \ - break; \ - default: \ - assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10" \ - " or VPX_BITS_12"); \ - name = NULL; \ - } \ - } while (0) -#else -#define ASSIGN_MINQ_TABLE(bit_depth, name) \ - do { \ - (void) bit_depth; \ - name = name##_8; \ - } while (0) -#endif - -// Tables relating active max Q to active min Q -static int kf_low_motion_minq_8[QINDEX_RANGE]; -static int kf_high_motion_minq_8[QINDEX_RANGE]; -static int arfgf_low_motion_minq_8[QINDEX_RANGE]; -static int arfgf_high_motion_minq_8[QINDEX_RANGE]; -static int inter_minq_8[QINDEX_RANGE]; -static int rtc_minq_8[QINDEX_RANGE]; - -#if CONFIG_VP9_HIGHBITDEPTH -static int kf_low_motion_minq_10[QINDEX_RANGE]; -static int kf_high_motion_minq_10[QINDEX_RANGE]; -static int arfgf_low_motion_minq_10[QINDEX_RANGE]; -static int arfgf_high_motion_minq_10[QINDEX_RANGE]; -static int inter_minq_10[QINDEX_RANGE]; -static int rtc_minq_10[QINDEX_RANGE]; -static int kf_low_motion_minq_12[QINDEX_RANGE]; -static int kf_high_motion_minq_12[QINDEX_RANGE]; -static int arfgf_low_motion_minq_12[QINDEX_RANGE]; -static int arfgf_high_motion_minq_12[QINDEX_RANGE]; -static int inter_minq_12[QINDEX_RANGE]; -static int rtc_minq_12[QINDEX_RANGE]; -#endif - -static int gf_high = 2000; -static int gf_low = 400; -static int kf_high = 5000; -static int kf_low = 400; - -// Functions to compute the active minq lookup table entries based on a -// formulaic approach to facilitate easier adjustment of the Q tables. -// The formulae were derived from computing a 3rd order polynomial best -// fit to the original data (after plotting real maxq vs minq (not q index)) -static int get_minq_index(double maxq, double x3, double x2, double x1, - vpx_bit_depth_t bit_depth) { - int i; - const double minqtarget = VPXMIN(((x3 * maxq + x2) * maxq + x1) * maxq, maxq); - - // Special case handling to deal with the step from q2.0 - // down to lossless mode represented by q 1.0. - if (minqtarget <= 2.0) - return 0; - - for (i = 0; i < QINDEX_RANGE; i++) { - if (minqtarget <= vp10_convert_qindex_to_q(i, bit_depth)) - return i; - } - - return QINDEX_RANGE - 1; -} - -static void init_minq_luts(int *kf_low_m, int *kf_high_m, - int *arfgf_low, int *arfgf_high, - int *inter, int *rtc, vpx_bit_depth_t bit_depth) { - int i; - for (i = 0; i < QINDEX_RANGE; i++) { - const double maxq = vp10_convert_qindex_to_q(i, bit_depth); - kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth); - kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth); - arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth); - arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth); - inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth); - rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth); - } -} - -void vp10_rc_init_minq_luts(void) { - init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8, - arfgf_low_motion_minq_8, arfgf_high_motion_minq_8, - inter_minq_8, rtc_minq_8, VPX_BITS_8); -#if CONFIG_VP9_HIGHBITDEPTH - init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10, - arfgf_low_motion_minq_10, arfgf_high_motion_minq_10, - inter_minq_10, rtc_minq_10, VPX_BITS_10); - init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12, - arfgf_low_motion_minq_12, arfgf_high_motion_minq_12, - inter_minq_12, rtc_minq_12, VPX_BITS_12); -#endif -} - -// These functions use formulaic calculations to make playing with the -// quantizer tables easier. If necessary they can be replaced by lookup -// tables if and when things settle down in the experimental bitstream -double vp10_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) { - // Convert the index to a real Q value (scaled down to match old Q values) -#if CONFIG_VP9_HIGHBITDEPTH - switch (bit_depth) { - case VPX_BITS_8: - return vp10_ac_quant(qindex, 0, bit_depth) / 4.0; - case VPX_BITS_10: - return vp10_ac_quant(qindex, 0, bit_depth) / 16.0; - case VPX_BITS_12: - return vp10_ac_quant(qindex, 0, bit_depth) / 64.0; - default: - assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12"); - return -1.0; - } -#else - return vp10_ac_quant(qindex, 0, bit_depth) / 4.0; -#endif -} - -int vp10_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, - double correction_factor, - vpx_bit_depth_t bit_depth) { - const double q = vp10_convert_qindex_to_q(qindex, bit_depth); - int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000; - - assert(correction_factor <= MAX_BPB_FACTOR && - correction_factor >= MIN_BPB_FACTOR); - - // q based adjustment to baseline enumerator - enumerator += (int)(enumerator * q) >> 12; - return (int)(enumerator * correction_factor / q); -} - -int vp10_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs, - double correction_factor, - vpx_bit_depth_t bit_depth) { - const int bpm = (int)(vp10_rc_bits_per_mb(frame_type, q, correction_factor, - bit_depth)); - return VPXMAX(FRAME_OVERHEAD_BITS, - (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS); -} - -int vp10_rc_clamp_pframe_target_size(const VP10_COMP *const cpi, int target) { - const RATE_CONTROL *rc = &cpi->rc; - const VP10EncoderConfig *oxcf = &cpi->oxcf; - const int min_frame_target = VPXMAX(rc->min_frame_bandwidth, - rc->avg_frame_bandwidth >> 5); - if (target < min_frame_target) - target = min_frame_target; - if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) { - // If there is an active ARF at this location use the minimum - // bits on this frame even if it is a constructed arf. - // The active maximum quantizer insures that an appropriate - // number of bits will be spent if needed for constructed ARFs. - target = min_frame_target; - } - // Clip the frame target to the maximum allowed value. - if (target > rc->max_frame_bandwidth) - target = rc->max_frame_bandwidth; - if (oxcf->rc_max_inter_bitrate_pct) { - const int max_rate = rc->avg_frame_bandwidth * - oxcf->rc_max_inter_bitrate_pct / 100; - target = VPXMIN(target, max_rate); - } - return target; -} - -int vp10_rc_clamp_iframe_target_size(const VP10_COMP *const cpi, int target) { - const RATE_CONTROL *rc = &cpi->rc; - const VP10EncoderConfig *oxcf = &cpi->oxcf; - if (oxcf->rc_max_intra_bitrate_pct) { - const int max_rate = rc->avg_frame_bandwidth * - oxcf->rc_max_intra_bitrate_pct / 100; - target = VPXMIN(target, max_rate); - } - if (target > rc->max_frame_bandwidth) - target = rc->max_frame_bandwidth; - return target; -} - -// Update the buffer level: leaky bucket model. -static void update_buffer_level(VP10_COMP *cpi, int encoded_frame_size) { - const VP10_COMMON *const cm = &cpi->common; - RATE_CONTROL *const rc = &cpi->rc; - - // Non-viewable frames are a special case and are treated as pure overhead. - if (!cm->show_frame) { - rc->bits_off_target -= encoded_frame_size; - } else { - rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size; - } - - // Clip the buffer level to the maximum specified buffer size. - rc->bits_off_target = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size); - rc->buffer_level = rc->bits_off_target; -} - -int vp10_rc_get_default_min_gf_interval( - int width, int height, double framerate) { - // Assume we do not need any constraint lower than 4K 20 fps - static const double factor_safe = 3840 * 2160 * 20.0; - const double factor = width * height * framerate; - const int default_interval = - clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL); - - if (factor <= factor_safe) - return default_interval; - else - return VPXMAX(default_interval, - (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5)); - // Note this logic makes: - // 4K24: 5 - // 4K30: 6 - // 4K60: 12 -} - -int vp10_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) { - int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75)); - interval += (interval & 0x01); // Round to even value - return VPXMAX(interval, min_gf_interval); -} - -void vp10_rc_init(const VP10EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) { - int i; - - if (pass == 0 && oxcf->rc_mode == VPX_CBR) { - rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q; - rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q; - } else { - rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q + - oxcf->best_allowed_q) / 2; - rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q + - oxcf->best_allowed_q) / 2; - } - - rc->last_q[KEY_FRAME] = oxcf->best_allowed_q; - rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q; - - rc->buffer_level = rc->starting_buffer_level; - rc->bits_off_target = rc->starting_buffer_level; - - rc->rolling_target_bits = rc->avg_frame_bandwidth; - rc->rolling_actual_bits = rc->avg_frame_bandwidth; - rc->long_rolling_target_bits = rc->avg_frame_bandwidth; - rc->long_rolling_actual_bits = rc->avg_frame_bandwidth; - - rc->total_actual_bits = 0; - rc->total_target_bits = 0; - rc->total_target_vs_actual = 0; - - rc->frames_since_key = 8; // Sensible default for first frame. - rc->this_key_frame_forced = 0; - rc->next_key_frame_forced = 0; - rc->source_alt_ref_pending = 0; - rc->source_alt_ref_active = 0; - - rc->frames_till_gf_update_due = 0; - rc->ni_av_qi = oxcf->worst_allowed_q; - rc->ni_tot_qi = 0; - rc->ni_frames = 0; - - rc->tot_q = 0.0; - rc->avg_q = vp10_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth); - - for (i = 0; i < RATE_FACTOR_LEVELS; ++i) { - rc->rate_correction_factors[i] = 1.0; - } - - rc->min_gf_interval = oxcf->min_gf_interval; - rc->max_gf_interval = oxcf->max_gf_interval; - if (rc->min_gf_interval == 0) - rc->min_gf_interval = vp10_rc_get_default_min_gf_interval( - oxcf->width, oxcf->height, oxcf->init_framerate); - if (rc->max_gf_interval == 0) - rc->max_gf_interval = vp10_rc_get_default_max_gf_interval( - oxcf->init_framerate, rc->min_gf_interval); - rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2; -} - -int vp10_rc_drop_frame(VP10_COMP *cpi) { - const VP10EncoderConfig *oxcf = &cpi->oxcf; - RATE_CONTROL *const rc = &cpi->rc; - - if (!oxcf->drop_frames_water_mark) { - return 0; - } else { - if (rc->buffer_level < 0) { - // Always drop if buffer is below 0. - return 1; - } else { - // If buffer is below drop_mark, for now just drop every other frame - // (starting with the next frame) until it increases back over drop_mark. - int drop_mark = (int)(oxcf->drop_frames_water_mark * - rc->optimal_buffer_level / 100); - if ((rc->buffer_level > drop_mark) && - (rc->decimation_factor > 0)) { - --rc->decimation_factor; - } else if (rc->buffer_level <= drop_mark && - rc->decimation_factor == 0) { - rc->decimation_factor = 1; - } - if (rc->decimation_factor > 0) { - if (rc->decimation_count > 0) { - --rc->decimation_count; - return 1; - } else { - rc->decimation_count = rc->decimation_factor; - return 0; - } - } else { - rc->decimation_count = 0; - return 0; - } - } - } -} - -static double get_rate_correction_factor(const VP10_COMP *cpi) { - const RATE_CONTROL *const rc = &cpi->rc; - double rcf; - - if (cpi->common.frame_type == KEY_FRAME) { - rcf = rc->rate_correction_factors[KF_STD]; - } else if (cpi->oxcf.pass == 2) { - RATE_FACTOR_LEVEL rf_lvl = - cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index]; - rcf = rc->rate_correction_factors[rf_lvl]; - } else { - if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && - !rc->is_src_frame_alt_ref && - (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20)) - rcf = rc->rate_correction_factors[GF_ARF_STD]; - else - rcf = rc->rate_correction_factors[INTER_NORMAL]; - } - rcf *= rcf_mult[rc->frame_size_selector]; - return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR); -} - -static void set_rate_correction_factor(VP10_COMP *cpi, double factor) { - RATE_CONTROL *const rc = &cpi->rc; - - // Normalize RCF to account for the size-dependent scaling factor. - factor /= rcf_mult[cpi->rc.frame_size_selector]; - - factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR); - - if (cpi->common.frame_type == KEY_FRAME) { - rc->rate_correction_factors[KF_STD] = factor; - } else if (cpi->oxcf.pass == 2) { - RATE_FACTOR_LEVEL rf_lvl = - cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index]; - rc->rate_correction_factors[rf_lvl] = factor; - } else { - if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && - !rc->is_src_frame_alt_ref && - (cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20)) - rc->rate_correction_factors[GF_ARF_STD] = factor; - else - rc->rate_correction_factors[INTER_NORMAL] = factor; - } -} - -void vp10_rc_update_rate_correction_factors(VP10_COMP *cpi) { - const VP10_COMMON *const cm = &cpi->common; - int correction_factor = 100; - double rate_correction_factor = get_rate_correction_factor(cpi); - double adjustment_limit; - - int projected_size_based_on_q = 0; - - // Do not update the rate factors for arf overlay frames. - if (cpi->rc.is_src_frame_alt_ref) - return; - - // Clear down mmx registers to allow floating point in what follows - vpx_clear_system_state(); - - // Work out how big we would have expected the frame to be at this Q given - // the current correction factor. - // Stay in double to avoid int overflow when values are large - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) { - projected_size_based_on_q = - vp10_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor); - } else { - projected_size_based_on_q = vp10_estimate_bits_at_q(cpi->common.frame_type, - cm->base_qindex, - cm->MBs, - rate_correction_factor, - cm->bit_depth); - } - // Work out a size correction factor. - if (projected_size_based_on_q > FRAME_OVERHEAD_BITS) - correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) / - projected_size_based_on_q); - - // More heavily damped adjustment used if we have been oscillating either side - // of target. - adjustment_limit = 0.25 + - 0.5 * VPXMIN(1, fabs(log10(0.01 * correction_factor))); - - cpi->rc.q_2_frame = cpi->rc.q_1_frame; - cpi->rc.q_1_frame = cm->base_qindex; - cpi->rc.rc_2_frame = cpi->rc.rc_1_frame; - if (correction_factor > 110) - cpi->rc.rc_1_frame = -1; - else if (correction_factor < 90) - cpi->rc.rc_1_frame = 1; - else - cpi->rc.rc_1_frame = 0; - - if (correction_factor > 102) { - // We are not already at the worst allowable quality - correction_factor = (int)(100 + ((correction_factor - 100) * - adjustment_limit)); - rate_correction_factor = (rate_correction_factor * correction_factor) / 100; - // Keep rate_correction_factor within limits - if (rate_correction_factor > MAX_BPB_FACTOR) - rate_correction_factor = MAX_BPB_FACTOR; - } else if (correction_factor < 99) { - // We are not already at the best allowable quality - correction_factor = (int)(100 - ((100 - correction_factor) * - adjustment_limit)); - rate_correction_factor = (rate_correction_factor * correction_factor) / 100; - - // Keep rate_correction_factor within limits - if (rate_correction_factor < MIN_BPB_FACTOR) - rate_correction_factor = MIN_BPB_FACTOR; - } - - set_rate_correction_factor(cpi, rate_correction_factor); -} - - -int vp10_rc_regulate_q(const VP10_COMP *cpi, int target_bits_per_frame, - int active_best_quality, int active_worst_quality) { - const VP10_COMMON *const cm = &cpi->common; - int q = active_worst_quality; - int last_error = INT_MAX; - int i, target_bits_per_mb, bits_per_mb_at_this_q; - const double correction_factor = get_rate_correction_factor(cpi); - - // Calculate required scaling factor based on target frame size and size of - // frame produced using previous Q. - target_bits_per_mb = - ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs; - - i = active_best_quality; - - do { - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) { - bits_per_mb_at_this_q = - (int)vp10_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor); - } else { - bits_per_mb_at_this_q = (int)vp10_rc_bits_per_mb(cm->frame_type, i, - correction_factor, - cm->bit_depth); - } - - if (bits_per_mb_at_this_q <= target_bits_per_mb) { - if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error) - q = i; - else - q = i - 1; - - break; - } else { - last_error = bits_per_mb_at_this_q - target_bits_per_mb; - } - } while (++i <= active_worst_quality); - - // In CBR mode, this makes sure q is between oscillating Qs to prevent - // resonance. - if (cpi->oxcf.rc_mode == VPX_CBR && - (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) && - cpi->rc.q_1_frame != cpi->rc.q_2_frame) { - q = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame), - VPXMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame)); - } - return q; -} - -static int get_active_quality(int q, int gfu_boost, int low, int high, - int *low_motion_minq, int *high_motion_minq) { - if (gfu_boost > high) { - return low_motion_minq[q]; - } else if (gfu_boost < low) { - return high_motion_minq[q]; - } else { - const int gap = high - low; - const int offset = high - gfu_boost; - const int qdiff = high_motion_minq[q] - low_motion_minq[q]; - const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap; - return low_motion_minq[q] + adjustment; - } -} - -static int get_kf_active_quality(const RATE_CONTROL *const rc, int q, - vpx_bit_depth_t bit_depth) { - int *kf_low_motion_minq; - int *kf_high_motion_minq; - ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq); - ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq); - return get_active_quality(q, rc->kf_boost, kf_low, kf_high, - kf_low_motion_minq, kf_high_motion_minq); -} - -static int get_gf_active_quality(const RATE_CONTROL *const rc, int q, - vpx_bit_depth_t bit_depth) { - int *arfgf_low_motion_minq; - int *arfgf_high_motion_minq; - ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq); - ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq); - return get_active_quality(q, rc->gfu_boost, gf_low, gf_high, - arfgf_low_motion_minq, arfgf_high_motion_minq); -} - -static int calc_active_worst_quality_one_pass_vbr(const VP10_COMP *cpi) { - const RATE_CONTROL *const rc = &cpi->rc; - const unsigned int curr_frame = cpi->common.current_video_frame; - int active_worst_quality; - - if (cpi->common.frame_type == KEY_FRAME) { - active_worst_quality = curr_frame == 0 ? rc->worst_quality - : rc->last_q[KEY_FRAME] * 2; - } else { - if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4 - : rc->last_q[INTER_FRAME]; - } else { - active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2 - : rc->last_q[INTER_FRAME] * 2; - } - } - return VPXMIN(active_worst_quality, rc->worst_quality); -} - -// Adjust active_worst_quality level based on buffer level. -static int calc_active_worst_quality_one_pass_cbr(const VP10_COMP *cpi) { - // Adjust active_worst_quality: If buffer is above the optimal/target level, - // bring active_worst_quality down depending on fullness of buffer. - // If buffer is below the optimal level, let the active_worst_quality go from - // ambient Q (at buffer = optimal level) to worst_quality level - // (at buffer = critical level). - const VP10_COMMON *const cm = &cpi->common; - const RATE_CONTROL *rc = &cpi->rc; - // Buffer level below which we push active_worst to worst_quality. - int64_t critical_level = rc->optimal_buffer_level >> 3; - int64_t buff_lvl_step = 0; - int adjustment = 0; - int active_worst_quality; - int ambient_qp; - if (cm->frame_type == KEY_FRAME) - return rc->worst_quality; - // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME] - // for the first few frames following key frame. These are both initialized - // to worst_quality and updated with (3/4, 1/4) average in postencode_update. - // So for first few frames following key, the qp of that key frame is weighted - // into the active_worst_quality setting. - ambient_qp = (cm->current_video_frame < 5) ? - VPXMIN(rc->avg_frame_qindex[INTER_FRAME], - rc->avg_frame_qindex[KEY_FRAME]) : - rc->avg_frame_qindex[INTER_FRAME]; - active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4); - if (rc->buffer_level > rc->optimal_buffer_level) { - // Adjust down. - // Maximum limit for down adjustment, ~30%. - int max_adjustment_down = active_worst_quality / 3; - if (max_adjustment_down) { - buff_lvl_step = ((rc->maximum_buffer_size - - rc->optimal_buffer_level) / max_adjustment_down); - if (buff_lvl_step) - adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) / - buff_lvl_step); - active_worst_quality -= adjustment; - } - } else if (rc->buffer_level > critical_level) { - // Adjust up from ambient Q. - if (critical_level) { - buff_lvl_step = (rc->optimal_buffer_level - critical_level); - if (buff_lvl_step) { - adjustment = (int)((rc->worst_quality - ambient_qp) * - (rc->optimal_buffer_level - rc->buffer_level) / - buff_lvl_step); - } - active_worst_quality = ambient_qp + adjustment; - } - } else { - // Set to worst_quality if buffer is below critical level. - active_worst_quality = rc->worst_quality; - } - return active_worst_quality; -} - -static int rc_pick_q_and_bounds_one_pass_cbr(const VP10_COMP *cpi, - int *bottom_index, - int *top_index) { - const VP10_COMMON *const cm = &cpi->common; - const RATE_CONTROL *const rc = &cpi->rc; - int active_best_quality; - int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); - int q; - int *rtc_minq; - ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq); - - if (frame_is_intra_only(cm)) { - active_best_quality = rc->best_quality; - // Handle the special case for key frames forced when we have reached - // the maximum key frame interval. Here force the Q to a range - // based on the ambient Q to reduce the risk of popping. - if (rc->this_key_frame_forced) { - int qindex = rc->last_boosted_qindex; - double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q, - (last_boosted_q * 0.75), - cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } else if (cm->current_video_frame > 0) { - // not first frame of one pass and kf_boost is set - double q_adj_factor = 1.0; - double q_val; - - active_best_quality = - get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME], - cm->bit_depth); - - // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { - q_adj_factor -= 0.25; - } - - // Convert the adjustment factor to a qindex delta - // on active_best_quality. - q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth); - active_best_quality += vp10_compute_qdelta(rc, q_val, - q_val * q_adj_factor, - cm->bit_depth); - } - } else if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - // Use the lower of active_worst_quality and recent - // average Q as basis for GF/ARF best Q limit unless last frame was - // a key frame. - if (rc->frames_since_key > 1 && - rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { - q = rc->avg_frame_qindex[INTER_FRAME]; - } else { - q = active_worst_quality; - } - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - } else { - // Use the lower of active_worst_quality and recent/average Q. - if (cm->current_video_frame > 1) { - if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) - active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]]; - else - active_best_quality = rtc_minq[active_worst_quality]; - } else { - if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality) - active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]]; - else - active_best_quality = rtc_minq[active_worst_quality]; - } - } - - // Clip the active best and worst quality values to limits - active_best_quality = clamp(active_best_quality, - rc->best_quality, rc->worst_quality); - active_worst_quality = clamp(active_worst_quality, - active_best_quality, rc->worst_quality); - - *top_index = active_worst_quality; - *bottom_index = active_best_quality; - -#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY - // Limit Q range for the adaptive loop. - if (cm->frame_type == KEY_FRAME && - !rc->this_key_frame_forced && - !(cm->current_video_frame == 0)) { - int qdelta = 0; - vpx_clear_system_state(); - qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, - active_worst_quality, 2.0, - cm->bit_depth); - *top_index = active_worst_quality + qdelta; - *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index; - } -#endif - - // Special case code to try and match quality with forced key frames - if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) { - q = rc->last_boosted_qindex; - } else { - q = vp10_rc_regulate_q(cpi, rc->this_frame_target, - active_best_quality, active_worst_quality); - if (q > *top_index) { - // Special case when we are targeting the max allowed rate - if (rc->this_frame_target >= rc->max_frame_bandwidth) - *top_index = q; - else - q = *top_index; - } - } - assert(*top_index <= rc->worst_quality && - *top_index >= rc->best_quality); - assert(*bottom_index <= rc->worst_quality && - *bottom_index >= rc->best_quality); - assert(q <= rc->worst_quality && q >= rc->best_quality); - return q; -} - -static int get_active_cq_level(const RATE_CONTROL *rc, - const VP10EncoderConfig *const oxcf) { - static const double cq_adjust_threshold = 0.1; - int active_cq_level = oxcf->cq_level; - if (oxcf->rc_mode == VPX_CQ && - rc->total_target_bits > 0) { - const double x = (double)rc->total_actual_bits / rc->total_target_bits; - if (x < cq_adjust_threshold) { - active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold); - } - } - return active_cq_level; -} - -static int rc_pick_q_and_bounds_one_pass_vbr(const VP10_COMP *cpi, - int *bottom_index, - int *top_index) { - const VP10_COMMON *const cm = &cpi->common; - const RATE_CONTROL *const rc = &cpi->rc; - const VP10EncoderConfig *const oxcf = &cpi->oxcf; - const int cq_level = get_active_cq_level(rc, oxcf); - int active_best_quality; - int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi); - int q; - int *inter_minq; - ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq); - - if (frame_is_intra_only(cm)) { - if (oxcf->rc_mode == VPX_Q) { - int qindex = cq_level; - double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - int delta_qindex = vp10_compute_qdelta(rc, q, q * 0.25, - cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } else if (rc->this_key_frame_forced) { - int qindex = rc->last_boosted_qindex; - double last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - int delta_qindex = vp10_compute_qdelta(rc, last_boosted_q, - last_boosted_q * 0.75, - cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } else { - // not first frame of one pass and kf_boost is set - double q_adj_factor = 1.0; - double q_val; - - active_best_quality = - get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME], - cm->bit_depth); - - // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { - q_adj_factor -= 0.25; - } - - // Convert the adjustment factor to a qindex delta - // on active_best_quality. - q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth); - active_best_quality += vp10_compute_qdelta(rc, q_val, - q_val * q_adj_factor, - cm->bit_depth); - } - } else if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - // Use the lower of active_worst_quality and recent - // average Q as basis for GF/ARF best Q limit unless last frame was - // a key frame. - if (rc->frames_since_key > 1 && - rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { - q = rc->avg_frame_qindex[INTER_FRAME]; - } else { - q = rc->avg_frame_qindex[KEY_FRAME]; - } - // For constrained quality dont allow Q less than the cq level - if (oxcf->rc_mode == VPX_CQ) { - if (q < cq_level) - q = cq_level; - - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - - // Constrained quality use slightly lower active best. - active_best_quality = active_best_quality * 15 / 16; - - } else if (oxcf->rc_mode == VPX_Q) { - int qindex = cq_level; - double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - int delta_qindex; - if (cpi->refresh_alt_ref_frame) - delta_qindex = vp10_compute_qdelta(rc, q, q * 0.40, cm->bit_depth); - else - delta_qindex = vp10_compute_qdelta(rc, q, q * 0.50, cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } else { - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - } - } else { - if (oxcf->rc_mode == VPX_Q) { - int qindex = cq_level; - double q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - double delta_rate[FIXED_GF_INTERVAL] = - {0.50, 1.0, 0.85, 1.0, 0.70, 1.0, 0.85, 1.0}; - int delta_qindex = - vp10_compute_qdelta(rc, q, - q * delta_rate[cm->current_video_frame % - FIXED_GF_INTERVAL], cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } else { - // Use the lower of active_worst_quality and recent/average Q. - if (cm->current_video_frame > 1) - active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]]; - else - active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]]; - // For the constrained quality mode we don't want - // q to fall below the cq level. - if ((oxcf->rc_mode == VPX_CQ) && - (active_best_quality < cq_level)) { - active_best_quality = cq_level; - } - } - } - - // Clip the active best and worst quality values to limits - active_best_quality = clamp(active_best_quality, - rc->best_quality, rc->worst_quality); - active_worst_quality = clamp(active_worst_quality, - active_best_quality, rc->worst_quality); - - *top_index = active_worst_quality; - *bottom_index = active_best_quality; - -#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY - { - int qdelta = 0; - vpx_clear_system_state(); - - // Limit Q range for the adaptive loop. - if (cm->frame_type == KEY_FRAME && - !rc->this_key_frame_forced && - !(cm->current_video_frame == 0)) { - qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, - active_worst_quality, 2.0, - cm->bit_depth); - } else if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, - active_worst_quality, 1.75, - cm->bit_depth); - } - *top_index = active_worst_quality + qdelta; - *top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index; - } -#endif - - if (oxcf->rc_mode == VPX_Q) { - q = active_best_quality; - // Special case code to try and match quality with forced key frames - } else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) { - q = rc->last_boosted_qindex; - } else { - q = vp10_rc_regulate_q(cpi, rc->this_frame_target, - active_best_quality, active_worst_quality); - if (q > *top_index) { - // Special case when we are targeting the max allowed rate - if (rc->this_frame_target >= rc->max_frame_bandwidth) - *top_index = q; - else - q = *top_index; - } - } - - assert(*top_index <= rc->worst_quality && - *top_index >= rc->best_quality); - assert(*bottom_index <= rc->worst_quality && - *bottom_index >= rc->best_quality); - assert(q <= rc->worst_quality && q >= rc->best_quality); - return q; -} - -int vp10_frame_type_qdelta(const VP10_COMP *cpi, int rf_level, int q) { - static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = { - 1.00, // INTER_NORMAL - 1.00, // INTER_HIGH - 1.50, // GF_ARF_LOW - 1.75, // GF_ARF_STD - 2.00, // KF_STD - }; - static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] = - {INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME}; - const VP10_COMMON *const cm = &cpi->common; - int qdelta = vp10_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level], - q, rate_factor_deltas[rf_level], - cm->bit_depth); - return qdelta; -} - -#define STATIC_MOTION_THRESH 95 -static int rc_pick_q_and_bounds_two_pass(const VP10_COMP *cpi, - int *bottom_index, - int *top_index) { - const VP10_COMMON *const cm = &cpi->common; - const RATE_CONTROL *const rc = &cpi->rc; - const VP10EncoderConfig *const oxcf = &cpi->oxcf; - const GF_GROUP *gf_group = &cpi->twopass.gf_group; - const int cq_level = get_active_cq_level(rc, oxcf); - int active_best_quality; - int active_worst_quality = cpi->twopass.active_worst_quality; - int q; - int *inter_minq; - ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq); - - if (frame_is_intra_only(cm)) { - // Handle the special case for key frames forced when we have reached - // the maximum key frame interval. Here force the Q to a range - // based on the ambient Q to reduce the risk of popping. - if (rc->this_key_frame_forced) { - double last_boosted_q; - int delta_qindex; - int qindex; - - if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { - qindex = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex); - active_best_quality = qindex; - last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - delta_qindex = vp10_compute_qdelta(rc, last_boosted_q, - last_boosted_q * 1.25, - cm->bit_depth); - active_worst_quality = - VPXMIN(qindex + delta_qindex, active_worst_quality); - } else { - qindex = rc->last_boosted_qindex; - last_boosted_q = vp10_convert_qindex_to_q(qindex, cm->bit_depth); - delta_qindex = vp10_compute_qdelta(rc, last_boosted_q, - last_boosted_q * 0.75, - cm->bit_depth); - active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); - } - } else { - // Not forced keyframe. - double q_adj_factor = 1.0; - double q_val; - // Baseline value derived from cpi->active_worst_quality and kf boost. - active_best_quality = get_kf_active_quality(rc, active_worst_quality, - cm->bit_depth); - - // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { - q_adj_factor -= 0.25; - } - - // Make a further adjustment based on the kf zero motion measure. - q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct); - - // Convert the adjustment factor to a qindex delta - // on active_best_quality. - q_val = vp10_convert_qindex_to_q(active_best_quality, cm->bit_depth); - active_best_quality += vp10_compute_qdelta(rc, q_val, - q_val * q_adj_factor, - cm->bit_depth); - } - } else if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - // Use the lower of active_worst_quality and recent - // average Q as basis for GF/ARF best Q limit unless last frame was - // a key frame. - if (rc->frames_since_key > 1 && - rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { - q = rc->avg_frame_qindex[INTER_FRAME]; - } else { - q = active_worst_quality; - } - // For constrained quality dont allow Q less than the cq level - if (oxcf->rc_mode == VPX_CQ) { - if (q < cq_level) - q = cq_level; - - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - - // Constrained quality use slightly lower active best. - active_best_quality = active_best_quality * 15 / 16; - - } else if (oxcf->rc_mode == VPX_Q) { - if (!cpi->refresh_alt_ref_frame) { - active_best_quality = cq_level; - } else { - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - - // Modify best quality for second level arfs. For mode VPX_Q this - // becomes the baseline frame q. - if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW) - active_best_quality = (active_best_quality + cq_level + 1) / 2; - } - } else { - active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); - } - } else { - if (oxcf->rc_mode == VPX_Q) { - active_best_quality = cq_level; - } else { - active_best_quality = inter_minq[active_worst_quality]; - - // For the constrained quality mode we don't want - // q to fall below the cq level. - if ((oxcf->rc_mode == VPX_CQ) && - (active_best_quality < cq_level)) { - active_best_quality = cq_level; - } - } - } - - // Extension to max or min Q if undershoot or overshoot is outside - // the permitted range. - if ((cpi->oxcf.rc_mode != VPX_Q) && - (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) { - if (frame_is_intra_only(cm) || - (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) { - active_best_quality -= - (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast); - active_worst_quality += (cpi->twopass.extend_maxq / 2); - } else { - active_best_quality -= - (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2; - active_worst_quality += cpi->twopass.extend_maxq; - } - } - -#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY - vpx_clear_system_state(); - // Static forced key frames Q restrictions dealt with elsewhere. - if (!(frame_is_intra_only(cm)) || - !rc->this_key_frame_forced || - (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) { - int qdelta = vp10_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index], - active_worst_quality); - active_worst_quality = VPXMAX(active_worst_quality + qdelta, - active_best_quality); - } -#endif - - // Modify active_best_quality for downscaled normal frames. - if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) { - int qdelta = vp10_compute_qdelta_by_rate(rc, cm->frame_type, - active_best_quality, 2.0, - cm->bit_depth); - active_best_quality = - VPXMAX(active_best_quality + qdelta, rc->best_quality); - } - - active_best_quality = clamp(active_best_quality, - rc->best_quality, rc->worst_quality); - active_worst_quality = clamp(active_worst_quality, - active_best_quality, rc->worst_quality); - - if (oxcf->rc_mode == VPX_Q) { - q = active_best_quality; - // Special case code to try and match quality with forced key frames. - } else if (frame_is_intra_only(cm) && rc->this_key_frame_forced) { - // If static since last kf use better of last boosted and last kf q. - if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { - q = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex); - } else { - q = rc->last_boosted_qindex; - } - } else { - q = vp10_rc_regulate_q(cpi, rc->this_frame_target, - active_best_quality, active_worst_quality); - if (q > active_worst_quality) { - // Special case when we are targeting the max allowed rate. - if (rc->this_frame_target >= rc->max_frame_bandwidth) - active_worst_quality = q; - else - q = active_worst_quality; - } - } - clamp(q, active_best_quality, active_worst_quality); - - *top_index = active_worst_quality; - *bottom_index = active_best_quality; - - assert(*top_index <= rc->worst_quality && - *top_index >= rc->best_quality); - assert(*bottom_index <= rc->worst_quality && - *bottom_index >= rc->best_quality); - assert(q <= rc->worst_quality && q >= rc->best_quality); - return q; -} - -int vp10_rc_pick_q_and_bounds(const VP10_COMP *cpi, - int *bottom_index, int *top_index) { - int q; - if (cpi->oxcf.pass == 0) { - if (cpi->oxcf.rc_mode == VPX_CBR) - q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index); - else - q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index); - } else { - q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index); - } - - return q; -} - -void vp10_rc_compute_frame_size_bounds(const VP10_COMP *cpi, - int frame_target, - int *frame_under_shoot_limit, - int *frame_over_shoot_limit) { - if (cpi->oxcf.rc_mode == VPX_Q) { - *frame_under_shoot_limit = 0; - *frame_over_shoot_limit = INT_MAX; - } else { - // For very small rate targets where the fractional adjustment - // may be tiny make sure there is at least a minimum range. - const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100; - *frame_under_shoot_limit = VPXMAX(frame_target - tolerance - 200, 0); - *frame_over_shoot_limit = VPXMIN(frame_target + tolerance + 200, - cpi->rc.max_frame_bandwidth); - } -} - -void vp10_rc_set_frame_target(VP10_COMP *cpi, int target) { - const VP10_COMMON *const cm = &cpi->common; - RATE_CONTROL *const rc = &cpi->rc; - - rc->this_frame_target = target; - - // Modify frame size target when down-scaling. - if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC && - rc->frame_size_selector != UNSCALED) - rc->this_frame_target = (int)(rc->this_frame_target - * rate_thresh_mult[rc->frame_size_selector]); - - // Target rate per SB64 (including partial SB64s. - rc->sb64_target_rate = ((int64_t)rc->this_frame_target * 64 * 64) / - (cm->width * cm->height); -} - -static void update_alt_ref_frame_stats(VP10_COMP *cpi) { - // this frame refreshes means next frames don't unless specified by user - RATE_CONTROL *const rc = &cpi->rc; - rc->frames_since_golden = 0; - - // Mark the alt ref as done (setting to 0 means no further alt refs pending). - rc->source_alt_ref_pending = 0; - - // Set the alternate reference frame active flag - rc->source_alt_ref_active = 1; -} - -static void update_golden_frame_stats(VP10_COMP *cpi) { - RATE_CONTROL *const rc = &cpi->rc; - - // Update the Golden frame usage counts. - if (cpi->refresh_golden_frame) { - // this frame refreshes means next frames don't unless specified by user - rc->frames_since_golden = 0; - - // If we are not using alt ref in the up and coming group clear the arf - // active flag. In multi arf group case, if the index is not 0 then - // we are overlaying a mid group arf so should not reset the flag. - if (cpi->oxcf.pass == 2) { - if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0)) - rc->source_alt_ref_active = 0; - } else if (!rc->source_alt_ref_pending) { - rc->source_alt_ref_active = 0; - } - - // Decrement count down till next gf - if (rc->frames_till_gf_update_due > 0) - rc->frames_till_gf_update_due--; - - } else if (!cpi->refresh_alt_ref_frame) { - // Decrement count down till next gf - if (rc->frames_till_gf_update_due > 0) - rc->frames_till_gf_update_due--; - - rc->frames_since_golden++; - } -} - -void vp10_rc_postencode_update(VP10_COMP *cpi, uint64_t bytes_used) { - const VP10_COMMON *const cm = &cpi->common; - const VP10EncoderConfig *const oxcf = &cpi->oxcf; - RATE_CONTROL *const rc = &cpi->rc; - const int qindex = cm->base_qindex; - - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) { - vp10_cyclic_refresh_postencode(cpi); - } - - // Update rate control heuristics - rc->projected_frame_size = (int)(bytes_used << 3); - - // Post encode loop adjustment of Q prediction. - vp10_rc_update_rate_correction_factors(cpi); - - // Keep a record of last Q and ambient average Q. - if (cm->frame_type == KEY_FRAME) { - rc->last_q[KEY_FRAME] = qindex; - rc->avg_frame_qindex[KEY_FRAME] = - ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2); - } else { - if (!rc->is_src_frame_alt_ref && - !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { - rc->last_q[INTER_FRAME] = qindex; - rc->avg_frame_qindex[INTER_FRAME] = - ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2); - rc->ni_frames++; - rc->tot_q += vp10_convert_qindex_to_q(qindex, cm->bit_depth); - rc->avg_q = rc->tot_q / rc->ni_frames; - // Calculate the average Q for normal inter frames (not key or GFU - // frames). - rc->ni_tot_qi += qindex; - rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames; - } - } - - // Keep record of last boosted (KF/KF/ARF) Q value. - // If the current frame is coded at a lower Q then we also update it. - // If all mbs in this group are skipped only update if the Q value is - // better than that already stored. - // This is used to help set quality in forced key frames to reduce popping - if ((qindex < rc->last_boosted_qindex) || - (cm->frame_type == KEY_FRAME) || - (!rc->constrained_gf_group && - (cpi->refresh_alt_ref_frame || - (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { - rc->last_boosted_qindex = qindex; - } - if (cm->frame_type == KEY_FRAME) - rc->last_kf_qindex = qindex; - - update_buffer_level(cpi, rc->projected_frame_size); - - // Rolling monitors of whether we are over or underspending used to help - // regulate min and Max Q in two pass. - if (cm->frame_type != KEY_FRAME) { - rc->rolling_target_bits = ROUND_POWER_OF_TWO( - rc->rolling_target_bits * 3 + rc->this_frame_target, 2); - rc->rolling_actual_bits = ROUND_POWER_OF_TWO( - rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2); - rc->long_rolling_target_bits = ROUND_POWER_OF_TWO( - rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5); - rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO( - rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5); - } - - // Actual bits spent - rc->total_actual_bits += rc->projected_frame_size; - rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0; - - rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits; - - if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame && - (cm->frame_type != KEY_FRAME)) - // Update the alternate reference frame stats as appropriate. - update_alt_ref_frame_stats(cpi); - else - // Update the Golden frame stats as appropriate. - update_golden_frame_stats(cpi); - - if (cm->frame_type == KEY_FRAME) - rc->frames_since_key = 0; - if (cm->show_frame) { - rc->frames_since_key++; - rc->frames_to_key--; - } - - // Trigger the resizing of the next frame if it is scaled. - if (oxcf->pass != 0) { - cpi->resize_pending = - rc->next_frame_size_selector != rc->frame_size_selector; - rc->frame_size_selector = rc->next_frame_size_selector; - } -} - -void vp10_rc_postencode_update_drop_frame(VP10_COMP *cpi) { - // Update buffer level with zero size, update frame counters, and return. - update_buffer_level(cpi, 0); - cpi->rc.frames_since_key++; - cpi->rc.frames_to_key--; - cpi->rc.rc_2_frame = 0; - cpi->rc.rc_1_frame = 0; -} - -// Use this macro to turn on/off use of alt-refs in one-pass mode. -#define USE_ALTREF_FOR_ONE_PASS 1 - -static int calc_pframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) { - static const int af_ratio = 10; - const RATE_CONTROL *const rc = &cpi->rc; - int target; -#if USE_ALTREF_FOR_ONE_PASS - target = (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) ? - (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) / - (rc->baseline_gf_interval + af_ratio - 1) : - (rc->avg_frame_bandwidth * rc->baseline_gf_interval) / - (rc->baseline_gf_interval + af_ratio - 1); -#else - target = rc->avg_frame_bandwidth; -#endif - return vp10_rc_clamp_pframe_target_size(cpi, target); -} - -static int calc_iframe_target_size_one_pass_vbr(const VP10_COMP *const cpi) { - static const int kf_ratio = 25; - const RATE_CONTROL *rc = &cpi->rc; - const int target = rc->avg_frame_bandwidth * kf_ratio; - return vp10_rc_clamp_iframe_target_size(cpi, target); -} - -void vp10_rc_get_one_pass_vbr_params(VP10_COMP *cpi) { - VP10_COMMON *const cm = &cpi->common; - RATE_CONTROL *const rc = &cpi->rc; - int target; - // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic. - if (!cpi->refresh_alt_ref_frame && - (cm->current_video_frame == 0 || - (cpi->frame_flags & FRAMEFLAGS_KEY) || - rc->frames_to_key == 0 || - (cpi->oxcf.auto_key && 0))) { - cm->frame_type = KEY_FRAME; - rc->this_key_frame_forced = cm->current_video_frame != 0 && - rc->frames_to_key == 0; - rc->frames_to_key = cpi->oxcf.key_freq; - rc->kf_boost = DEFAULT_KF_BOOST; - rc->source_alt_ref_active = 0; - } else { - cm->frame_type = INTER_FRAME; - } - if (rc->frames_till_gf_update_due == 0) { - rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2; - rc->frames_till_gf_update_due = rc->baseline_gf_interval; - // NOTE: frames_till_gf_update_due must be <= frames_to_key. - if (rc->frames_till_gf_update_due > rc->frames_to_key) { - rc->frames_till_gf_update_due = rc->frames_to_key; - rc->constrained_gf_group = 1; - } else { - rc->constrained_gf_group = 0; - } - cpi->refresh_golden_frame = 1; - rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS; - rc->gfu_boost = DEFAULT_GF_BOOST; - } - if (cm->frame_type == KEY_FRAME) - target = calc_iframe_target_size_one_pass_vbr(cpi); - else - target = calc_pframe_target_size_one_pass_vbr(cpi); - vp10_rc_set_frame_target(cpi, target); -} - -static int calc_pframe_target_size_one_pass_cbr(const VP10_COMP *cpi) { - const VP10EncoderConfig *oxcf = &cpi->oxcf; - const RATE_CONTROL *rc = &cpi->rc; - const int64_t diff = rc->optimal_buffer_level - rc->buffer_level; - const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100; - int min_frame_target = - VPXMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS); - int target; - - if (oxcf->gf_cbr_boost_pct) { - const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100; - target = cpi->refresh_golden_frame ? - (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) / - (rc->baseline_gf_interval * 100 + af_ratio_pct - 100) : - (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) / - (rc->baseline_gf_interval * 100 + af_ratio_pct - 100); - } else { - target = rc->avg_frame_bandwidth; - } - - if (diff > 0) { - // Lower the target bandwidth for this frame. - const int pct_low = (int)VPXMIN(diff / one_pct_bits, oxcf->under_shoot_pct); - target -= (target * pct_low) / 200; - } else if (diff < 0) { - // Increase the target bandwidth for this frame. - const int pct_high = - (int)VPXMIN(-diff / one_pct_bits, oxcf->over_shoot_pct); - target += (target * pct_high) / 200; - } - if (oxcf->rc_max_inter_bitrate_pct) { - const int max_rate = rc->avg_frame_bandwidth * - oxcf->rc_max_inter_bitrate_pct / 100; - target = VPXMIN(target, max_rate); - } - return VPXMAX(min_frame_target, target); -} - -static int calc_iframe_target_size_one_pass_cbr(const VP10_COMP *cpi) { - const RATE_CONTROL *rc = &cpi->rc; - int target; - if (cpi->common.current_video_frame == 0) { - target = ((rc->starting_buffer_level / 2) > INT_MAX) - ? INT_MAX : (int)(rc->starting_buffer_level / 2); - } else { - int kf_boost = 32; - double framerate = cpi->framerate; - - kf_boost = VPXMAX(kf_boost, (int)(2 * framerate - 16)); - if (rc->frames_since_key < framerate / 2) { - kf_boost = (int)(kf_boost * rc->frames_since_key / - (framerate / 2)); - } - target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4; - } - return vp10_rc_clamp_iframe_target_size(cpi, target); -} - -void vp10_rc_get_one_pass_cbr_params(VP10_COMP *cpi) { - VP10_COMMON *const cm = &cpi->common; - RATE_CONTROL *const rc = &cpi->rc; - int target; - // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic. - if ((cm->current_video_frame == 0 || - (cpi->frame_flags & FRAMEFLAGS_KEY) || - rc->frames_to_key == 0 || - (cpi->oxcf.auto_key && 0))) { - cm->frame_type = KEY_FRAME; - rc->this_key_frame_forced = cm->current_video_frame != 0 && - rc->frames_to_key == 0; - rc->frames_to_key = cpi->oxcf.key_freq; - rc->kf_boost = DEFAULT_KF_BOOST; - rc->source_alt_ref_active = 0; - } else { - cm->frame_type = INTER_FRAME; - } - if (rc->frames_till_gf_update_due == 0) { - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) - vp10_cyclic_refresh_set_golden_update(cpi); - else - rc->baseline_gf_interval = - (rc->min_gf_interval + rc->max_gf_interval) / 2; - rc->frames_till_gf_update_due = rc->baseline_gf_interval; - // NOTE: frames_till_gf_update_due must be <= frames_to_key. - if (rc->frames_till_gf_update_due > rc->frames_to_key) - rc->frames_till_gf_update_due = rc->frames_to_key; - cpi->refresh_golden_frame = 1; - rc->gfu_boost = DEFAULT_GF_BOOST; - } - - // Any update/change of global cyclic refresh parameters (amount/delta-qp) - // should be done here, before the frame qp is selected. - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) - vp10_cyclic_refresh_update_parameters(cpi); - - if (cm->frame_type == KEY_FRAME) - target = calc_iframe_target_size_one_pass_cbr(cpi); - else - target = calc_pframe_target_size_one_pass_cbr(cpi); - - vp10_rc_set_frame_target(cpi, target); - if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC) - cpi->resize_pending = vp10_resize_one_pass_cbr(cpi); - else - cpi->resize_pending = 0; -} - -int vp10_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, - vpx_bit_depth_t bit_depth) { - int start_index = rc->worst_quality; - int target_index = rc->worst_quality; - int i; - - // Convert the average q value to an index. - for (i = rc->best_quality; i < rc->worst_quality; ++i) { - start_index = i; - if (vp10_convert_qindex_to_q(i, bit_depth) >= qstart) - break; - } - - // Convert the q target to an index - for (i = rc->best_quality; i < rc->worst_quality; ++i) { - target_index = i; - if (vp10_convert_qindex_to_q(i, bit_depth) >= qtarget) - break; - } - - return target_index - start_index; -} - -int vp10_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, - int qindex, double rate_target_ratio, - vpx_bit_depth_t bit_depth) { - int target_index = rc->worst_quality; - int i; - - // Look up the current projected bits per block for the base index - const int base_bits_per_mb = vp10_rc_bits_per_mb(frame_type, qindex, 1.0, - bit_depth); - - // Find the target bits per mb based on the base value and given ratio. - const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb); - - // Convert the q target to an index - for (i = rc->best_quality; i < rc->worst_quality; ++i) { - if (vp10_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <= - target_bits_per_mb) { - target_index = i; - break; - } - } - return target_index - qindex; -} - -void vp10_rc_set_gf_interval_range(const VP10_COMP *const cpi, - RATE_CONTROL *const rc) { - const VP10EncoderConfig *const oxcf = &cpi->oxcf; - - // Special case code for 1 pass fixed Q mode tests - if ((oxcf->pass == 0) && (oxcf->rc_mode == VPX_Q)) { - rc->max_gf_interval = FIXED_GF_INTERVAL; - rc->min_gf_interval = FIXED_GF_INTERVAL; - rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL; - } else { - // Set Maximum gf/arf interval - rc->max_gf_interval = oxcf->max_gf_interval; - rc->min_gf_interval = oxcf->min_gf_interval; - if (rc->min_gf_interval == 0) - rc->min_gf_interval = vp10_rc_get_default_min_gf_interval( - oxcf->width, oxcf->height, cpi->framerate); - if (rc->max_gf_interval == 0) - rc->max_gf_interval = vp10_rc_get_default_max_gf_interval( - cpi->framerate, rc->min_gf_interval); - - // Extended interval for genuinely static scenes - rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2; - - if (is_altref_enabled(cpi)) { - if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1) - rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1; - } - - if (rc->max_gf_interval > rc->static_scene_max_gf_interval) - rc->max_gf_interval = rc->static_scene_max_gf_interval; - - // Clamp min to max - rc->min_gf_interval = VPXMIN(rc->min_gf_interval, rc->max_gf_interval); - } -} - -void vp10_rc_update_framerate(VP10_COMP *cpi) { - const VP10_COMMON *const cm = &cpi->common; - const VP10EncoderConfig *const oxcf = &cpi->oxcf; - RATE_CONTROL *const rc = &cpi->rc; - int vbr_max_bits; - - rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate); - rc->min_frame_bandwidth = (int)(rc->avg_frame_bandwidth * - oxcf->two_pass_vbrmin_section / 100); - - rc->min_frame_bandwidth = - VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS); - - // A maximum bitrate for a frame is defined. - // The baseline for this aligns with HW implementations that - // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits - // per 16x16 MB (averaged over a frame). However this limit is extended if - // a very high rate is given on the command line or the the rate cannnot - // be acheived because of a user specificed max q (e.g. when the user - // specifies lossless encode. - vbr_max_bits = (int)(((int64_t)rc->avg_frame_bandwidth * - oxcf->two_pass_vbrmax_section) / 100); - rc->max_frame_bandwidth = - VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); - - vp10_rc_set_gf_interval_range(cpi, rc); -} - -#define VBR_PCT_ADJUSTMENT_LIMIT 50 -// For VBR...adjustment to the frame target based on error from previous frames -static void vbr_rate_correction(VP10_COMP *cpi, int *this_frame_target) { - RATE_CONTROL *const rc = &cpi->rc; - int64_t vbr_bits_off_target = rc->vbr_bits_off_target; - int max_delta; - double position_factor = 1.0; - - // How far through the clip are we. - // This number is used to damp the per frame rate correction. - // Range 0 - 1.0 - if (cpi->twopass.total_stats.count) { - position_factor = sqrt((double)cpi->common.current_video_frame / - cpi->twopass.total_stats.count); - } - max_delta = (int)(position_factor * - ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100)); - - // vbr_bits_off_target > 0 means we have extra bits to spend - if (vbr_bits_off_target > 0) { - *this_frame_target += - (vbr_bits_off_target > max_delta) ? max_delta - : (int)vbr_bits_off_target; - } else { - *this_frame_target -= - (vbr_bits_off_target < -max_delta) ? max_delta - : (int)-vbr_bits_off_target; - } - - // Fast redistribution of bits arising from massive local undershoot. - // Dont do it for kf,arf,gf or overlay frames. - if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref && - rc->vbr_bits_off_target_fast) { - int one_frame_bits = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target); - int fast_extra_bits; - fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits); - fast_extra_bits = (int)VPXMIN( - fast_extra_bits, - VPXMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8)); - *this_frame_target += (int)fast_extra_bits; - rc->vbr_bits_off_target_fast -= fast_extra_bits; - } -} - -void vp10_set_target_rate(VP10_COMP *cpi) { - RATE_CONTROL *const rc = &cpi->rc; - int target_rate = rc->base_frame_target; - - // Correction to rate target based on prior over or under shoot. - if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ) - vbr_rate_correction(cpi, &target_rate); - vp10_rc_set_frame_target(cpi, target_rate); -} - -// Check if we should resize, based on average QP from past x frames. -// Only allow for resize at most one scale down for now, scaling factor is 2. -int vp10_resize_one_pass_cbr(VP10_COMP *cpi) { - const VP10_COMMON *const cm = &cpi->common; - RATE_CONTROL *const rc = &cpi->rc; - int resize_now = 0; - cpi->resize_scale_num = 1; - cpi->resize_scale_den = 1; - // Don't resize on key frame; reset the counters on key frame. - if (cm->frame_type == KEY_FRAME) { - cpi->resize_avg_qp = 0; - cpi->resize_count = 0; - return 0; - } - // Resize based on average buffer underflow and QP over some window. - // Ignore samples close to key frame, since QP is usually high after key. - if (cpi->rc.frames_since_key > 2 * cpi->framerate) { - const int window = (int)(5 * cpi->framerate); - cpi->resize_avg_qp += cm->base_qindex; - if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100)) - ++cpi->resize_buffer_underflow; - ++cpi->resize_count; - // Check for resize action every "window" frames. - if (cpi->resize_count >= window) { - int avg_qp = cpi->resize_avg_qp / cpi->resize_count; - // Resize down if buffer level has underflowed sufficent amount in past - // window, and we are at original resolution. - // Resize back up if average QP is low, and we are currently in a resized - // down state. - if (cpi->resize_state == 0 && - cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) { - resize_now = 1; - cpi->resize_state = 1; - } else if (cpi->resize_state == 1 && - avg_qp < 40 * cpi->rc.worst_quality / 100) { - resize_now = -1; - cpi->resize_state = 0; - } - // Reset for next window measurement. - cpi->resize_avg_qp = 0; - cpi->resize_count = 0; - cpi->resize_buffer_underflow = 0; - } - } - // If decision is to resize, reset some quantities, and check is we should - // reduce rate correction factor, - if (resize_now != 0) { - int target_bits_per_frame; - int active_worst_quality; - int qindex; - int tot_scale_change; - // For now, resize is by 1/2 x 1/2. - cpi->resize_scale_num = 1; - cpi->resize_scale_den = 2; - tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) / - (cpi->resize_scale_num * cpi->resize_scale_num); - // Reset buffer level to optimal, update target size. - rc->buffer_level = rc->optimal_buffer_level; - rc->bits_off_target = rc->optimal_buffer_level; - rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi); - // Reset cyclic refresh parameters. - if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) - vp10_cyclic_refresh_reset_resize(cpi); - // Get the projected qindex, based on the scaled target frame size (scaled - // so target_bits_per_mb in vp10_rc_regulate_q will be correct target). - target_bits_per_frame = (resize_now == 1) ? - rc->this_frame_target * tot_scale_change : - rc->this_frame_target / tot_scale_change; - active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); - qindex = vp10_rc_regulate_q(cpi, - target_bits_per_frame, - rc->best_quality, - active_worst_quality); - // If resize is down, check if projected q index is close to worst_quality, - // and if so, reduce the rate correction factor (since likely can afford - // lower q for resized frame). - if (resize_now == 1 && - qindex > 90 * cpi->rc.worst_quality / 100) { - rc->rate_correction_factors[INTER_NORMAL] *= 0.85; - } - // If resize is back up, check if projected q index is too much above the - // current base_qindex, and if so, reduce the rate correction factor - // (since prefer to keep q for resized frame at least close to previous q). - if (resize_now == -1 && - qindex > 130 * cm->base_qindex / 100) { - rc->rate_correction_factors[INTER_NORMAL] *= 0.9; - } - } - return resize_now; -} |