| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #include <assert.h> |
| #include <limits.h> |
| #include <math.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "aom_dsp/aom_dsp_common.h" |
| #include "aom_mem/aom_mem.h" |
| #include "aom_ports/mem.h" |
| #include "aom_ports/system_state.h" |
| |
| #include "av1/common/alloccommon.h" |
| #include "av1/encoder/aq_cyclicrefresh.h" |
| #include "av1/common/common.h" |
| #include "av1/common/entropymode.h" |
| #include "av1/common/quant_common.h" |
| #include "av1/common/seg_common.h" |
| |
| #include "av1/encoder/encodemv.h" |
| #include "av1/encoder/encode_strategy.h" |
| #include "av1/encoder/gop_structure.h" |
| #include "av1/encoder/random.h" |
| #include "av1/encoder/ratectrl.h" |
| |
| #define USE_UNRESTRICTED_Q_IN_CQ_MODE 0 |
| |
| // 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 MIN_BPB_FACTOR 0.005 |
| #define MAX_BPB_FACTOR 50 |
| |
| #define SUPERRES_QADJ_PER_DENOM_KEYFRAME_SOLO 0 |
| #define SUPERRES_QADJ_PER_DENOM_KEYFRAME 2 |
| #define SUPERRES_QADJ_PER_DENOM_ARFFRAME 0 |
| |
| #define FRAME_OVERHEAD_BITS 200 |
| #define ASSIGN_MINQ_TABLE(bit_depth, name) \ |
| do { \ |
| switch (bit_depth) { \ |
| case AOM_BITS_8: name = name##_8; break; \ |
| case AOM_BITS_10: name = name##_10; break; \ |
| case AOM_BITS_12: name = name##_12; break; \ |
| default: \ |
| assert(0 && \ |
| "bit_depth should be AOM_BITS_8, AOM_BITS_10" \ |
| " or AOM_BITS_12"); \ |
| name = NULL; \ |
| } \ |
| } while (0) |
| |
| // 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]; |
| |
| 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]; |
| |
| static int gf_high = 2400; |
| static int gf_low = 300; |
| static int kf_high = 5000; |
| static int kf_low = 400; |
| |
| // How many times less pixels there are to encode given the current scaling. |
| // Temporary replacement for rcf_mult and rate_thresh_mult. |
| static double resize_rate_factor(const AV1_COMP *cpi, int width, int height) { |
| return (double)(cpi->oxcf.width * cpi->oxcf.height) / (width * height); |
| } |
| |
| // 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, |
| aom_bit_depth_t bit_depth) { |
| const double minqtarget = AOMMIN(((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; |
| #if CONFIG_EXTQUANT |
| return av1_find_qindex(minqtarget, bit_depth, 0, |
| bit_depth == AOM_BITS_8 |
| ? QINDEX_RANGE_8_BITS - 1 |
| : bit_depth == AOM_BITS_10 |
| ? QINDEX_RANGE_10_BITS - 1 |
| : QINDEX_RANGE - 1); |
| #else |
| return av1_find_qindex(minqtarget, bit_depth, 0, QINDEX_RANGE - 1); |
| #endif |
| } |
| |
| static void init_minq_luts(int *kf_low_m, int *kf_high_m, int *arfgf_low, |
| int *arfgf_high, int *inter, int *rtc, |
| aom_bit_depth_t bit_depth) { |
| int i; |
| #if CONFIG_EXTQUANT |
| for (i = 0; i < (bit_depth == AOM_BITS_8 |
| ? QINDEX_RANGE_8_BITS |
| : bit_depth == AOM_BITS_10 ? QINDEX_RANGE_10_BITS |
| : QINDEX_RANGE); |
| i++) { |
| #else |
| for (i = 0; i < QINDEX_RANGE; i++) { |
| #endif |
| const double maxq = av1_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, 0.45, 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 av1_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, AOM_BITS_8); |
| 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, AOM_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, AOM_BITS_12); |
| } |
| |
| // 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 av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth) { |
| // Convert the index to a real Q value (scaled down to match old Q values) |
| switch (bit_depth) { |
| case AOM_BITS_8: |
| return av1_ac_quant_QTX(qindex, 0, bit_depth) / |
| (4.0 * (1 << QUANT_TABLE_BITS)); |
| case AOM_BITS_10: |
| return av1_ac_quant_QTX(qindex, 0, bit_depth) / |
| (16.0 * (1 << QUANT_TABLE_BITS)); |
| case AOM_BITS_12: |
| return av1_ac_quant_QTX(qindex, 0, bit_depth) / |
| (64.0 * (1 << QUANT_TABLE_BITS)); |
| default: |
| assert(0 && "bit_depth should be AOM_BITS_8, AOM_BITS_10 or AOM_BITS_12"); |
| return -1.0; |
| } |
| } |
| |
| int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, |
| double correction_factor, aom_bit_depth_t bit_depth) { |
| const double q = av1_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 av1_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs, |
| double correction_factor, |
| aom_bit_depth_t bit_depth) { |
| const int bpm = |
| (int)(av1_rc_bits_per_mb(frame_type, q, correction_factor, bit_depth)); |
| return AOMMAX(FRAME_OVERHEAD_BITS, |
| (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS); |
| } |
| |
| int av1_rc_clamp_pframe_target_size(const AV1_COMP *const cpi, int target, |
| FRAME_UPDATE_TYPE frame_update_type) { |
| const RATE_CONTROL *rc = &cpi->rc; |
| const AV1EncoderConfig *oxcf = &cpi->oxcf; |
| const int min_frame_target = |
| AOMMAX(rc->min_frame_bandwidth, rc->avg_frame_bandwidth >> 5); |
| // Clip the frame target to the minimum setup value. |
| if (frame_update_type == OVERLAY_UPDATE || |
| frame_update_type == INTNL_OVERLAY_UPDATE) { |
| // 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; |
| } else if (target < min_frame_target) { |
| 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 = AOMMIN(target, max_rate); |
| } |
| |
| return target; |
| } |
| |
| int av1_rc_clamp_iframe_target_size(const AV1_COMP *const cpi, int target) { |
| const RATE_CONTROL *rc = &cpi->rc; |
| const AV1EncoderConfig *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 = AOMMIN(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(AV1_COMP *cpi, int encoded_frame_size) { |
| const AV1_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 = AOMMIN(rc->bits_off_target, rc->maximum_buffer_size); |
| rc->buffer_level = rc->bits_off_target; |
| } |
| |
| int av1_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 AOMMAX(default_interval, |
| (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5)); |
| // Note this logic makes: |
| // 4K24: 5 |
| // 4K30: 6 |
| // 4K60: 12 |
| } |
| |
| int av1_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) { |
| int interval = AOMMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75)); |
| interval += (interval & 0x01); // Round to even value |
| interval = AOMMAX(MAX_GF_INTERVAL, interval); |
| return AOMMAX(interval, min_gf_interval); |
| } |
| |
| void av1_rc_init(const AV1EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) { |
| int i; |
| |
| if (pass == 0 && oxcf->rc_mode == AOM_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 = av1_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth); |
| |
| for (i = 0; i < RATE_FACTOR_LEVELS; ++i) { |
| rc->rate_correction_factors[i] = 0.7; |
| } |
| rc->rate_correction_factors[KF_STD] = 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 = av1_rc_get_default_min_gf_interval( |
| oxcf->width, oxcf->height, oxcf->init_framerate); |
| if (rc->max_gf_interval == 0) |
| rc->max_gf_interval = av1_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 av1_rc_drop_frame(AV1_COMP *cpi) { |
| const AV1EncoderConfig *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 const RATE_FACTOR_LEVEL rate_factor_levels[FRAME_UPDATE_TYPES] = { |
| KF_STD, // KF_UPDATE |
| INTER_NORMAL, // LF_UPDATE |
| GF_ARF_STD, // GF_UPDATE |
| GF_ARF_STD, // ARF_UPDATE |
| INTER_NORMAL, // OVERLAY_UPDATE |
| INTER_NORMAL, // INTNL_OVERLAY_UPDATE |
| GF_ARF_LOW, // INTNL_ARF_UPDATE |
| }; |
| |
| static RATE_FACTOR_LEVEL get_rate_factor_level(const GF_GROUP *const gf_group) { |
| const FRAME_UPDATE_TYPE update_type = gf_group->update_type[gf_group->index]; |
| assert(update_type < FRAME_UPDATE_TYPES); |
| return rate_factor_levels[update_type]; |
| } |
| |
| static double get_rate_correction_factor(const AV1_COMP *cpi, int width, |
| int height) { |
| const RATE_CONTROL *const rc = &cpi->rc; |
| double rcf; |
| |
| if (cpi->common.current_frame.frame_type == KEY_FRAME) { |
| rcf = rc->rate_correction_factors[KF_STD]; |
| } else if (is_stat_consumption_stage(cpi)) { |
| const RATE_FACTOR_LEVEL rf_lvl = get_rate_factor_level(&cpi->gf_group); |
| 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 != AOM_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 *= resize_rate_factor(cpi, width, height); |
| return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR); |
| } |
| |
| static void set_rate_correction_factor(AV1_COMP *cpi, double factor, int width, |
| int height) { |
| RATE_CONTROL *const rc = &cpi->rc; |
| |
| // Normalize RCF to account for the size-dependent scaling factor. |
| factor /= resize_rate_factor(cpi, width, height); |
| |
| factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR); |
| |
| if (cpi->common.current_frame.frame_type == KEY_FRAME) { |
| rc->rate_correction_factors[KF_STD] = factor; |
| } else if (is_stat_consumption_stage(cpi)) { |
| const RATE_FACTOR_LEVEL rf_lvl = get_rate_factor_level(&cpi->gf_group); |
| 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 != AOM_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 av1_rc_update_rate_correction_factors(AV1_COMP *cpi, int width, |
| int height) { |
| const AV1_COMMON *const cm = &cpi->common; |
| int correction_factor = 100; |
| double rate_correction_factor = |
| get_rate_correction_factor(cpi, width, height); |
| double adjustment_limit; |
| const int MBs = av1_get_MBs(width, height); |
| |
| 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 |
| aom_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 = |
| av1_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor); |
| } else { |
| projected_size_based_on_q = av1_estimate_bits_at_q( |
| cpi->common.current_frame.frame_type, cm->base_qindex, MBs, |
| rate_correction_factor, cm->seq_params.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. |
| if (correction_factor > 0) { |
| adjustment_limit = |
| 0.25 + 0.5 * AOMMIN(1, fabs(log10(0.01 * correction_factor))); |
| } else { |
| adjustment_limit = 0.75; |
| } |
| |
| 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, width, height); |
| } |
| |
| // Calculate rate for the given 'q'. |
| static int get_bits_per_mb(const AV1_COMP *cpi, int use_cyclic_refresh, |
| double correction_factor, int q) { |
| const AV1_COMMON *const cm = &cpi->common; |
| return use_cyclic_refresh |
| ? av1_cyclic_refresh_rc_bits_per_mb(cpi, q, correction_factor) |
| : av1_rc_bits_per_mb(cm->current_frame.frame_type, q, |
| correction_factor, cm->seq_params.bit_depth); |
| } |
| |
| // Similar to find_qindex_by_rate() function in ratectrl.c, but returns the q |
| // index with rate just above or below the desired rate, depending on which of |
| // the two rates is closer to the desired rate. |
| // Also, respects the selected aq_mode when computing the rate. |
| static int find_closest_qindex_by_rate(int desired_bits_per_mb, |
| const AV1_COMP *cpi, |
| double correction_factor, |
| int best_qindex, int worst_qindex) { |
| const int use_cyclic_refresh = |
| cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled; |
| |
| // Find 'qindex' based on 'desired_bits_per_mb'. |
| assert(best_qindex <= worst_qindex); |
| int low = best_qindex; |
| int high = worst_qindex; |
| while (low < high) { |
| const int mid = (low + high) >> 1; |
| const int mid_bits_per_mb = |
| get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, mid); |
| if (mid_bits_per_mb > desired_bits_per_mb) { |
| low = mid + 1; |
| } else { |
| high = mid; |
| } |
| } |
| assert(low == high); |
| |
| // Calculate rate difference of this q index from the desired rate. |
| const int curr_q = low; |
| const int curr_bits_per_mb = |
| get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, curr_q); |
| const int curr_bit_diff = (curr_bits_per_mb <= desired_bits_per_mb) |
| ? desired_bits_per_mb - curr_bits_per_mb |
| : INT_MAX; |
| assert((curr_bit_diff != INT_MAX && curr_bit_diff >= 0) || |
| curr_q == worst_qindex); |
| |
| // Calculate rate difference for previous q index too. |
| const int prev_q = curr_q - 1; |
| int prev_bit_diff; |
| if (curr_bit_diff == INT_MAX || curr_q == best_qindex) { |
| prev_bit_diff = INT_MAX; |
| } else { |
| const int prev_bits_per_mb = |
| get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, prev_q); |
| assert(prev_bits_per_mb > desired_bits_per_mb); |
| prev_bit_diff = prev_bits_per_mb - desired_bits_per_mb; |
| } |
| |
| // Pick one of the two q indices, depending on which one has rate closer to |
| // the desired rate. |
| return (curr_bit_diff <= prev_bit_diff) ? curr_q : prev_q; |
| } |
| |
| int av1_rc_regulate_q(const AV1_COMP *cpi, int target_bits_per_frame, |
| int active_best_quality, int active_worst_quality, |
| int width, int height) { |
| const int MBs = av1_get_MBs(width, height); |
| const double correction_factor = |
| get_rate_correction_factor(cpi, width, height); |
| const int target_bits_per_mb = |
| (int)(((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / MBs); |
| |
| int q = |
| find_closest_qindex_by_rate(target_bits_per_mb, cpi, correction_factor, |
| active_best_quality, active_worst_quality); |
| |
| // In CBR mode, this makes sure q is between oscillating Qs to prevent |
| // resonance. |
| if (cpi->oxcf.rc_mode == AOM_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, AOMMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame), |
| AOMMAX(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, |
| aom_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, |
| aom_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 get_gf_high_motion_quality(int q, aom_bit_depth_t bit_depth) { |
| int *arfgf_high_motion_minq; |
| ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq); |
| return arfgf_high_motion_minq[q]; |
| } |
| |
| static int calc_active_worst_quality_one_pass_vbr(const AV1_COMP *cpi) { |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const unsigned int curr_frame = cpi->common.current_frame.frame_number; |
| int active_worst_quality; |
| |
| if (cpi->common.current_frame.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_alt2_ref_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 AOMMIN(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 AV1_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 AV1_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->current_frame.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_frame.frame_number < 5) |
| ? AOMMIN(rc->avg_frame_qindex[INTER_FRAME], |
| rc->avg_frame_qindex[KEY_FRAME]) |
| : rc->avg_frame_qindex[INTER_FRAME]; |
| active_worst_quality = AOMMIN(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 AV1_COMP *cpi, int width, |
| int height, int *bottom_index, |
| int *top_index) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const CurrentFrame *const current_frame = &cm->current_frame; |
| int active_best_quality; |
| int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); |
| int q; |
| int *rtc_minq; |
| const int bit_depth = cm->seq_params.bit_depth; |
| ASSIGN_MINQ_TABLE(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 = av1_convert_qindex_to_q(qindex, bit_depth); |
| int delta_qindex = av1_compute_qdelta(rc, last_boosted_q, |
| (last_boosted_q * 0.75), bit_depth); |
| active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); |
| } else if (current_frame->frame_number > 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], bit_depth); |
| |
| // Allow somewhat lower kf minq with small image formats. |
| if ((width * height) <= (352 * 288)) { |
| q_adj_factor -= 0.25; |
| } |
| |
| // Convert the adjustment factor to a qindex delta |
| // on active_best_quality. |
| q_val = av1_convert_qindex_to_q(active_best_quality, bit_depth); |
| active_best_quality += |
| av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, 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, bit_depth); |
| } else { |
| // Use the lower of active_worst_quality and recent/average Q. |
| if (current_frame->frame_number > 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; |
| |
| // Limit Q range for the adaptive loop. |
| if (current_frame->frame_type == KEY_FRAME && !rc->this_key_frame_forced && |
| !(current_frame->frame_number == 0)) { |
| int qdelta = 0; |
| aom_clear_system_state(); |
| qdelta = av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, |
| active_worst_quality, 2.0, bit_depth); |
| *top_index = active_worst_quality + qdelta; |
| *top_index = AOMMAX(*top_index, *bottom_index); |
| } |
| |
| // Special case code to try and match quality with forced key frames |
| if (current_frame->frame_type == KEY_FRAME && rc->this_key_frame_forced) { |
| q = rc->last_boosted_qindex; |
| } else { |
| q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, |
| active_worst_quality, width, height); |
| 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 gf_group_pyramid_level(const GF_GROUP *gf_group, int gf_index) { |
| return gf_group->layer_depth[gf_index]; |
| } |
| |
| static int get_active_cq_level(const RATE_CONTROL *rc, |
| const AV1EncoderConfig *const oxcf, |
| int intra_only, int superres_denom) { |
| static const double cq_adjust_threshold = 0.1; |
| int active_cq_level = oxcf->cq_level; |
| (void)intra_only; |
| if (oxcf->rc_mode == AOM_CQ || oxcf->rc_mode == AOM_Q) { |
| // printf("Superres %d %d %d = %d\n", superres_denom, intra_only, |
| // rc->frames_to_key, !(intra_only && rc->frames_to_key <= 1)); |
| if ((oxcf->superres_mode == SUPERRES_QTHRESH || |
| oxcf->superres_mode == SUPERRES_AUTO) && |
| superres_denom != SCALE_NUMERATOR) { |
| int mult = SUPERRES_QADJ_PER_DENOM_KEYFRAME_SOLO; |
| if (intra_only && rc->frames_to_key <= 1) { |
| mult = 0; |
| } else if (intra_only) { |
| mult = SUPERRES_QADJ_PER_DENOM_KEYFRAME; |
| } else { |
| mult = SUPERRES_QADJ_PER_DENOM_ARFFRAME; |
| } |
| active_cq_level = AOMMAX( |
| active_cq_level - ((superres_denom - SCALE_NUMERATOR) * mult), 0); |
| } |
| } |
| if (oxcf->rc_mode == AOM_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 get_q_using_fixed_offsets(const AV1EncoderConfig *const oxcf, |
| const RATE_CONTROL *const rc, |
| const GF_GROUP *const gf_group, |
| int gf_index, int cq_level, |
| int bit_depth) { |
| assert(oxcf->use_fixed_qp_offsets); |
| assert(oxcf->rc_mode == AOM_Q); |
| const FRAME_UPDATE_TYPE update_type = gf_group->update_type[gf_index]; |
| |
| int offset_idx = -1; |
| if (update_type == KF_UPDATE) { |
| if (rc->frames_to_key == 1) { |
| // Image / intra-only coding: ignore offsets. |
| return cq_level; |
| } |
| offset_idx = 0; |
| } else if (update_type == ARF_UPDATE || update_type == GF_UPDATE) { |
| offset_idx = 1; |
| } else if (update_type == INTNL_ARF_UPDATE) { |
| offset_idx = |
| AOMMIN(gf_group->layer_depth[gf_index], FIXED_QP_OFFSET_COUNT - 1); |
| } else { // Leaf level / overlay frame. |
| assert(update_type == LF_UPDATE || update_type == OVERLAY_UPDATE || |
| update_type == INTNL_OVERLAY_UPDATE); |
| return cq_level; // Directly Return worst quality allowed. |
| } |
| assert(offset_idx >= 0 && offset_idx < FIXED_QP_OFFSET_COUNT); |
| assert(oxcf->fixed_qp_offsets[offset_idx] >= 0); |
| |
| // Get qindex offset, by first converting to 'q' and then back. |
| const double q_val_orig = av1_convert_qindex_to_q(cq_level, bit_depth); |
| const double q_val_target = |
| AOMMAX(q_val_orig - oxcf->fixed_qp_offsets[offset_idx], 0.0); |
| const int delta_qindex = |
| av1_compute_qdelta(rc, q_val_orig, q_val_target, bit_depth); |
| return AOMMAX(cq_level + delta_qindex, 0); |
| } |
| |
| static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, int width, |
| int height, int *bottom_index, |
| int *top_index) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const CurrentFrame *const current_frame = &cm->current_frame; |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| const int cq_level = get_active_cq_level(rc, oxcf, frame_is_intra_only(cm), |
| cm->superres_scale_denominator); |
| const int bit_depth = cm->seq_params.bit_depth; |
| |
| if (oxcf->use_fixed_qp_offsets) { |
| return get_q_using_fixed_offsets(oxcf, rc, &cpi->gf_group, |
| cpi->gf_group.index, cq_level, bit_depth); |
| } |
| |
| int active_best_quality; |
| int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi); |
| int q; |
| int *inter_minq; |
| ASSIGN_MINQ_TABLE(bit_depth, inter_minq); |
| |
| if (frame_is_intra_only(cm)) { |
| if (oxcf->rc_mode == AOM_Q) { |
| assert(0 && |
| "AOM_Q mode should not call " |
| "rc_pick_q_and_bounds_one_pass_vbr(), except for ALTREF frames."); |
| return -1; |
| } else if (rc->this_key_frame_forced) { |
| const int qindex = rc->last_boosted_qindex; |
| const double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); |
| const int delta_qindex = av1_compute_qdelta( |
| rc, last_boosted_q, last_boosted_q * 0.75, bit_depth); |
| active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); |
| } else { // not first frame of one pass and kf_boost is set |
| double q_adj_factor = 1.0; |
| |
| active_best_quality = |
| get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME], bit_depth); |
| |
| // Allow somewhat lower kf minq with small image formats. |
| if ((width * height) <= (352 * 288)) { |
| q_adj_factor -= 0.25; |
| } |
| |
| // Convert the adjustment factor to a qindex delta on active_best_quality. |
| { |
| const double q_val = |
| av1_convert_qindex_to_q(active_best_quality, bit_depth); |
| active_best_quality += |
| av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, 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. |
| q = (rc->frames_since_key > 1 && |
| rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) |
| ? rc->avg_frame_qindex[INTER_FRAME] |
| : rc->avg_frame_qindex[KEY_FRAME]; |
| // For constrained quality dont allow Q less than the cq level |
| if (oxcf->rc_mode == AOM_CQ) { |
| if (q < cq_level) q = cq_level; |
| active_best_quality = get_gf_active_quality(rc, q, bit_depth); |
| // Constrained quality use slightly lower active best. |
| active_best_quality = active_best_quality * 15 / 16; |
| } else if (oxcf->rc_mode == AOM_Q) { |
| const int qindex = cq_level; |
| const double q_val = av1_convert_qindex_to_q(qindex, bit_depth); |
| const int delta_qindex = |
| (cpi->refresh_alt_ref_frame) |
| ? av1_compute_qdelta(rc, q_val, q_val * 0.40, bit_depth) |
| : av1_compute_qdelta(rc, q_val, q_val * 0.50, bit_depth); |
| active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); |
| } else { |
| active_best_quality = get_gf_active_quality(rc, q, bit_depth); |
| } |
| } else { |
| if (oxcf->rc_mode == AOM_Q) { |
| assert(0 && |
| "AOM_Q mode should not call " |
| "rc_pick_q_and_bounds_one_pass_vbr(), except for ALTREF frames."); |
| return -1; |
| } else { |
| // Use the lower of active_worst_quality and recent/average Q. |
| active_best_quality = (current_frame->frame_number > 1) |
| ? inter_minq[rc->avg_frame_qindex[INTER_FRAME]] |
| : 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 == AOM_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; |
| |
| // Limit Q range for the adaptive loop. |
| { |
| int qdelta = 0; |
| aom_clear_system_state(); |
| if (current_frame->frame_type == KEY_FRAME && !rc->this_key_frame_forced && |
| !(current_frame->frame_number == 0)) { |
| qdelta = av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, |
| active_worst_quality, 2.0, bit_depth); |
| } else if (!rc->is_src_frame_alt_ref && |
| (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { |
| qdelta = |
| av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, |
| active_worst_quality, 1.75, bit_depth); |
| } |
| *top_index = active_worst_quality + qdelta; |
| *top_index = AOMMAX(*top_index, *bottom_index); |
| } |
| |
| if (oxcf->rc_mode == AOM_Q) { |
| q = active_best_quality; |
| // Special case code to try and match quality with forced key frames |
| } else if ((current_frame->frame_type == KEY_FRAME) && |
| rc->this_key_frame_forced) { |
| q = rc->last_boosted_qindex; |
| } else { |
| q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, |
| active_worst_quality, width, height); |
| 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 const double rate_factor_deltas[RATE_FACTOR_LEVELS] = { |
| 1.00, // INTER_NORMAL |
| 1.25, // GF_ARF_LOW |
| 2.00, // GF_ARF_STD |
| 2.00, // KF_STD |
| }; |
| |
| int av1_frame_type_qdelta(const AV1_COMP *cpi, int q) { |
| const RATE_FACTOR_LEVEL rf_lvl = get_rate_factor_level(&cpi->gf_group); |
| const FRAME_TYPE frame_type = (rf_lvl == KF_STD) ? KEY_FRAME : INTER_FRAME; |
| return av1_compute_qdelta_by_rate(&cpi->rc, frame_type, q, |
| rate_factor_deltas[rf_lvl], |
| cpi->common.seq_params.bit_depth); |
| } |
| |
| // This unrestricted Q selection on CQ mode is useful when testing new features, |
| // but may lead to Q being out of range on current RC restrictions |
| #if USE_UNRESTRICTED_Q_IN_CQ_MODE |
| static int rc_pick_q_and_bounds_one_pass_cq(const AV1_COMP *cpi, int width, |
| int height, int *bottom_index, |
| int *top_index) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| const int cq_level = get_active_cq_level(rc, oxcf, frame_is_intra_only(cm), |
| cm->superres_scale_denominator); |
| const int bit_depth = cm->seq_params.bit_depth; |
| const int q = (int)av1_convert_qindex_to_q(cq_level, bit_depth); |
| (void)width; |
| (void)height; |
| *top_index = q; |
| *bottom_index = q; |
| |
| return q; |
| } |
| #endif // USE_UNRESTRICTED_Q_IN_CQ_MODE |
| |
| #define STATIC_MOTION_THRESH 95 |
| static void get_intra_q_and_bounds_two_pass(const AV1_COMP *cpi, int width, |
| int height, int *active_best, |
| int *active_worst, int *arf_q, |
| int cq_level, int is_fwd_kf) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| int active_best_quality; |
| int active_worst_quality = *active_worst; |
| const int bit_depth = cm->seq_params.bit_depth; |
| |
| if (rc->frames_to_key == 1 && oxcf->rc_mode == AOM_Q) { |
| // If the next frame is also a key frame or the current frame is the |
| // only frame in the sequence in AOM_Q mode, just use the cq_level |
| // as q. |
| active_best_quality = cq_level; |
| active_worst_quality = cq_level; |
| } else if (is_fwd_kf) { |
| assert(oxcf->fwd_kf_enabled); |
| // Handle the special case for forward reference key frames. |
| // Increase the boost because this keyframe is used as a forward and |
| // backward reference. |
| const int qindex = rc->last_boosted_qindex; |
| const double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); |
| const int delta_qindex = av1_compute_qdelta( |
| rc, last_boosted_q, last_boosted_q * 0.25, bit_depth); |
| active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); |
| // Update the arf_q since the forward keyframe is replacing the ALTREF |
| *arf_q = active_best_quality; |
| } else if (rc->this_key_frame_forced) { |
| // 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. |
| double last_boosted_q; |
| int delta_qindex; |
| int qindex; |
| |
| if (is_stat_consumption_stage_twopass(cpi) && |
| cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { |
| qindex = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex); |
| active_best_quality = qindex; |
| last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); |
| delta_qindex = av1_compute_qdelta(rc, last_boosted_q, |
| last_boosted_q * 1.25, bit_depth); |
| active_worst_quality = |
| AOMMIN(qindex + delta_qindex, active_worst_quality); |
| } else { |
| qindex = rc->last_boosted_qindex; |
| last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); |
| delta_qindex = av1_compute_qdelta(rc, last_boosted_q, |
| last_boosted_q * 0.50, bit_depth); |
| active_best_quality = AOMMAX(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, bit_depth); |
| |
| if (is_stat_consumption_stage_twopass(cpi) && |
| cpi->twopass.kf_zeromotion_pct >= STATIC_KF_GROUP_THRESH) { |
| active_best_quality /= 3; |
| } |
| |
| // Allow somewhat lower kf minq with small image formats. |
| if ((width * height) <= (352 * 288)) { |
| q_adj_factor -= 0.25; |
| } |
| |
| // Make a further adjustment based on the kf zero motion measure. |
| if (is_stat_consumption_stage_twopass(cpi)) |
| 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 = av1_convert_qindex_to_q(active_best_quality, bit_depth); |
| active_best_quality += |
| av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth); |
| |
| // Tweak active_best_quality for AOM_Q mode when superres is on, as this |
| // will be used directly as 'q' later. |
| if (oxcf->rc_mode == AOM_Q && |
| (oxcf->superres_mode == SUPERRES_QTHRESH || |
| oxcf->superres_mode == SUPERRES_AUTO) && |
| cm->superres_scale_denominator != SCALE_NUMERATOR) { |
| active_best_quality = |
| AOMMAX(active_best_quality - |
| ((cm->superres_scale_denominator - SCALE_NUMERATOR) * |
| SUPERRES_QADJ_PER_DENOM_KEYFRAME), |
| 0); |
| } |
| } |
| *active_best = active_best_quality; |
| *active_worst = active_worst_quality; |
| } |
| |
| // Does some final adjustments to the q value and bounds. This does not apply to |
| // AOM_Q mode unless it is an INTRA_ONLY_FRAME. |
| static void postprocess_q_and_bounds(const AV1_COMP *cpi, int width, int height, |
| int *active_worst, int *active_best, |
| int *q_out, int is_intrl_arf_boost) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const AV1EncoderConfig *oxcf = &cpi->oxcf; |
| const int bit_depth = cpi->common.seq_params.bit_depth; |
| int active_best_quality = *active_best; |
| int active_worst_quality = *active_worst; |
| int q; |
| |
| // Extension to max or min Q if undershoot or overshoot is outside |
| // the permitted range. |
| if (cpi->oxcf.rc_mode != AOM_Q) { |
| if (frame_is_intra_only(cm) || |
| (!rc->is_src_frame_alt_ref && |
| (cpi->refresh_golden_frame || is_intrl_arf_boost || |
| 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; |
| } |
| } |
| |
| aom_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)) { |
| const int qdelta = av1_frame_type_qdelta(cpi, active_worst_quality); |
| active_worst_quality = |
| AOMMAX(active_worst_quality + qdelta, active_best_quality); |
| } |
| |
| // Modify active_best_quality for downscaled normal frames. |
| if (av1_frame_scaled(cm) && !frame_is_kf_gf_arf(cpi)) { |
| int qdelta = av1_compute_qdelta_by_rate( |
| rc, cm->current_frame.frame_type, active_best_quality, 2.0, bit_depth); |
| active_best_quality = |
| AOMMAX(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 == AOM_Q || |
| (frame_is_intra_only(cm) && !rc->this_key_frame_forced && |
| cpi->twopass.kf_zeromotion_pct >= STATIC_KF_GROUP_THRESH && |
| rc->frames_to_key > 1)) { |
| 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 = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex); |
| } else { |
| q = AOMMIN(rc->last_boosted_qindex, |
| (active_best_quality + active_worst_quality) / 2); |
| } |
| } else { |
| q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, |
| active_worst_quality, width, height); |
| 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); |
| |
| *active_best = active_best_quality; |
| *active_worst = active_worst_quality; |
| *q_out = q; |
| } |
| |
| static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int width, |
| int height, int gf_index, |
| int *bottom_index, int *top_index, |
| int *arf_q) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| const GF_GROUP *gf_group = &cpi->gf_group; |
| const int cq_level = get_active_cq_level(rc, oxcf, frame_is_intra_only(cm), |
| cm->superres_scale_denominator); |
| const int bit_depth = cm->seq_params.bit_depth; |
| |
| if (oxcf->use_fixed_qp_offsets) { |
| return get_q_using_fixed_offsets(oxcf, rc, gf_group, gf_group->index, |
| cq_level, bit_depth); |
| } |
| |
| int active_best_quality = 0; |
| int active_worst_quality = rc->active_worst_quality; |
| int q; |
| int *inter_minq; |
| ASSIGN_MINQ_TABLE(bit_depth, inter_minq); |
| |
| const int is_intrl_arf_boost = |
| gf_group->update_type[gf_index] == INTNL_ARF_UPDATE; |
| |
| if (frame_is_intra_only(cm)) { |
| const int is_fwd_kf = |
| cm->current_frame.frame_type == KEY_FRAME && cm->show_frame == 0; |
| get_intra_q_and_bounds_two_pass(cpi, width, height, &active_best_quality, |
| &active_worst_quality, arf_q, cq_level, |
| is_fwd_kf); |
| } else if (!rc->is_src_frame_alt_ref && |
| (cpi->refresh_golden_frame || is_intrl_arf_boost || |
| 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 == AOM_CQ) { |
| if (q < cq_level) q = cq_level; |
| |
| active_best_quality = get_gf_active_quality(rc, q, bit_depth); |
| |
| // Constrained quality use slightly lower active best. |
| active_best_quality = active_best_quality * 15 / 16; |
| |
| if (gf_group->update_type[gf_index] == ARF_UPDATE) { |
| const int min_boost = get_gf_high_motion_quality(q, bit_depth); |
| const int boost = min_boost - active_best_quality; |
| |
| active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); |
| *arf_q = active_best_quality; |
| } else if (is_intrl_arf_boost) { |
| assert(rc->arf_q >= 0); // Ensure it is set to a valid value. |
| active_best_quality = rc->arf_q; |
| int this_height = gf_group_pyramid_level(gf_group, gf_index); |
| while (this_height > 1) { |
| active_best_quality = |
| (active_best_quality + active_worst_quality + 1) / 2; |
| --this_height; |
| } |
| } |
| } else if (oxcf->rc_mode == AOM_Q) { |
| if (!cpi->refresh_alt_ref_frame && !is_intrl_arf_boost) { |
| active_best_quality = cq_level; |
| } else { |
| if (gf_group->update_type[gf_index] == ARF_UPDATE) { |
| active_best_quality = get_gf_active_quality(rc, q, bit_depth); |
| const int min_boost = get_gf_high_motion_quality(q, bit_depth); |
| const int boost = min_boost - active_best_quality; |
| |
| active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); |
| *arf_q = active_best_quality; |
| } else { |
| assert(rc->arf_q >= 0); // Ensure it is set to a valid value. |
| assert(is_intrl_arf_boost); |
| active_best_quality = rc->arf_q; |
| int this_height = gf_group_pyramid_level(gf_group, gf_index); |
| while (this_height > 1) { |
| active_best_quality = |
| (active_best_quality + active_worst_quality + 1) / 2; |
| --this_height; |
| } |
| } |
| } |
| } else { |
| active_best_quality = get_gf_active_quality(rc, q, bit_depth); |
| const int min_boost = get_gf_high_motion_quality(q, bit_depth); |
| const int boost = min_boost - active_best_quality; |
| |
| active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); |
| if (is_intrl_arf_boost) { |
| int this_height = gf_group_pyramid_level(gf_group, gf_index); |
| while (this_height > 1) { |
| active_best_quality = |
| (active_best_quality + active_worst_quality + 1) / 2; |
| --this_height; |
| } |
| } |
| } |
| } else { |
| if (oxcf->rc_mode == AOM_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 == AOM_CQ) && (active_best_quality < cq_level)) { |
| active_best_quality = cq_level; |
| } |
| } |
| } |
| |
| postprocess_q_and_bounds(cpi, width, height, &active_worst_quality, |
| &active_best_quality, &q, is_intrl_arf_boost); |
| |
| *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 av1_rc_pick_q_and_bounds(AV1_COMP *cpi, int width, int height, int gf_index, |
| int *bottom_index, int *top_index) { |
| int q; |
| // TODO(sarahparker) merge onepass vbr and altref q computation |
| // with two pass |
| GF_GROUP *gf_group = &cpi->gf_group; |
| if ((cpi->oxcf.rc_mode != AOM_Q || |
| gf_group->update_type[gf_index] == ARF_UPDATE) && |
| has_no_stats_stage(cpi)) { |
| if (cpi->oxcf.rc_mode == AOM_CBR) |
| q = rc_pick_q_and_bounds_one_pass_cbr(cpi, width, height, bottom_index, |
| top_index); |
| #if USE_UNRESTRICTED_Q_IN_CQ_MODE |
| else if (cpi->oxcf.rc_mode == AOM_CQ) |
| q = rc_pick_q_and_bounds_one_pass_cq(cpi, width, height, bottom_index, |
| top_index); |
| #endif // USE_UNRESTRICTED_Q_IN_CQ_MODE |
| else |
| q = rc_pick_q_and_bounds_one_pass_vbr(cpi, width, height, bottom_index, |
| top_index); |
| } else { |
| int arf_q = -1; // Initialize to invalid value, for sanity check later. |
| |
| q = rc_pick_q_and_bounds_two_pass(cpi, width, height, gf_index, |
| bottom_index, top_index, &arf_q); |
| } |
| if (gf_group->update_type[gf_index] == ARF_UPDATE) cpi->rc.arf_q = q; |
| |
| return q; |
| } |
| |
| void av1_rc_compute_frame_size_bounds(const AV1_COMP *cpi, int frame_target, |
| int *frame_under_shoot_limit, |
| int *frame_over_shoot_limit) { |
| if (cpi->oxcf.rc_mode == AOM_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 = AOMMAX(frame_target - tolerance - 200, 0); |
| *frame_over_shoot_limit = |
| AOMMIN(frame_target + tolerance + 200, cpi->rc.max_frame_bandwidth); |
| } |
| } |
| |
| void av1_rc_set_frame_target(AV1_COMP *cpi, int target, int width, int height) { |
| const AV1_COMMON *const cm = &cpi->common; |
| RATE_CONTROL *const rc = &cpi->rc; |
| |
| rc->this_frame_target = target; |
| |
| // Modify frame size target when down-scaled. |
| if (av1_frame_scaled(cm)) |
| rc->this_frame_target = |
| (int)(rc->this_frame_target * resize_rate_factor(cpi, width, height)); |
| |
| // Target rate per SB64 (including partial SB64s. |
| rc->sb64_target_rate = |
| (int)(((int64_t)rc->this_frame_target << 12) / (width * height)); |
| } |
| |
| static void update_alt_ref_frame_stats(AV1_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(AV1_COMP *cpi) { |
| RATE_CONTROL *const rc = &cpi->rc; |
| const GF_GROUP *const gf_group = &cpi->gf_group; |
| const int is_intrnl_arf = |
| is_stat_consumption_stage(cpi) |
| ? gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE |
| : cpi->refresh_alt2_ref_frame; |
| |
| // Update the Golden frame usage counts. |
| // NOTE(weitinglin): If we use show_existing_frame for an OVERLAY frame, |
| // only the virtual indices for the reference frame will be |
| // updated and cpi->refresh_golden_frame will still be zero. |
| if (cpi->refresh_golden_frame || rc->is_src_frame_alt_ref) { |
| // We will not use internal overlay frames to replace the golden frame |
| if (!rc->is_src_frame_internal_arf) { |
| // 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 (!rc->source_alt_ref_pending && (cpi->gf_group.index == 0)) |
| rc->source_alt_ref_active = 0; |
| } else if (!cpi->refresh_alt_ref_frame && !is_intrnl_arf) { |
| rc->frames_since_golden++; |
| } |
| } |
| |
| void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const CurrentFrame *const current_frame = &cm->current_frame; |
| RATE_CONTROL *const rc = &cpi->rc; |
| const GF_GROUP *const gf_group = &cpi->gf_group; |
| const int is_intrnl_arf = |
| is_stat_consumption_stage(cpi) |
| ? gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE |
| : cpi->refresh_alt2_ref_frame; |
| |
| const int qindex = cm->base_qindex; |
| |
| if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) { |
| av1_cyclic_refresh_postencode(cpi); |
| } |
| |
| // Update rate control heuristics |
| rc->projected_frame_size = (int)(bytes_used << 3); |
| |
| // Post encode loop adjustment of Q prediction. |
| av1_rc_update_rate_correction_factors(cpi, cm->width, cm->height); |
| |
| // Keep a record of last Q and ambient average Q. |
| if (current_frame->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 || is_intrnl_arf || |
| 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 += av1_convert_qindex_to_q(qindex, cm->seq_params.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/GF/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) || |
| (current_frame->frame_type == KEY_FRAME) || |
| (!rc->constrained_gf_group && |
| (cpi->refresh_alt_ref_frame || is_intrnl_arf || |
| (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { |
| rc->last_boosted_qindex = qindex; |
| } |
| if (current_frame->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 (av1_frame_scaled(cm)) |
| rc->this_frame_target = |
| (int)(rc->this_frame_target / |
| resize_rate_factor(cpi, cm->width, cm->height)); |
| if (current_frame->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 && |
| (current_frame->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 (current_frame->frame_type == KEY_FRAME) rc->frames_since_key = 0; |
| // if (current_frame->frame_number == 1 && cm->show_frame) |
| /* |
| rc->this_frame_target = |
| (int)(rc->this_frame_target / resize_rate_factor(cpi, cm->width, |
| cm->height)); |
| */ |
| } |
| |
| void av1_rc_postencode_update_drop_frame(AV1_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; |
| } |
| |
| int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth, |
| int best_qindex, int worst_qindex) { |
| assert(best_qindex <= worst_qindex); |
| int low = best_qindex; |
| int high = worst_qindex; |
| while (low < high) { |
| const int mid = (low + high) >> 1; |
| const double mid_q = av1_convert_qindex_to_q(mid, bit_depth); |
| if (mid_q < desired_q) { |
| low = mid + 1; |
| } else { |
| high = mid; |
| } |
| } |
| assert(low == high); |
| assert(av1_convert_qindex_to_q(low, bit_depth) >= desired_q || |
| low == worst_qindex); |
| return low; |
| } |
| |
| int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, |
| aom_bit_depth_t bit_depth) { |
| const int start_index = |
| av1_find_qindex(qstart, bit_depth, rc->best_quality, rc->worst_quality); |
| const int target_index = |
| av1_find_qindex(qtarget, bit_depth, rc->best_quality, rc->worst_quality); |
| return target_index - start_index; |
| } |
| |
| // Find q_index for the desired_bits_per_mb, within [best_qindex, worst_qindex], |
| // assuming 'correction_factor' is 1.0. |
| // To be precise, 'q_index' is the smallest integer, for which the corresponding |
| // bits per mb <= desired_bits_per_mb. |
| // If no such q index is found, returns 'worst_qindex'. |
| static int find_qindex_by_rate(int desired_bits_per_mb, |
| aom_bit_depth_t bit_depth, FRAME_TYPE frame_type, |
| int best_qindex, int worst_qindex) { |
| assert(best_qindex <= worst_qindex); |
| int low = best_qindex; |
| int high = worst_qindex; |
| while (low < high) { |
| const int mid = (low + high) >> 1; |
| const int mid_bits_per_mb = |
| av1_rc_bits_per_mb(frame_type, mid, 1.0, bit_depth); |
| if (mid_bits_per_mb > desired_bits_per_mb) { |
| low = mid + 1; |
| } else { |
| high = mid; |
| } |
| } |
| assert(low == high); |
| assert(av1_rc_bits_per_mb(frame_type, low, 1.0, bit_depth) <= |
| desired_bits_per_mb || |
| low == worst_qindex); |
| return low; |
| } |
| |
| int av1_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, |
| int qindex, double rate_target_ratio, |
| aom_bit_depth_t bit_depth) { |
| // Look up the current projected bits per block for the base index |
| const int base_bits_per_mb = |
| av1_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); |
| |
| const int target_index = |
| find_qindex_by_rate(target_bits_per_mb, bit_depth, frame_type, |
| rc->best_quality, rc->worst_quality); |
| return target_index - qindex; |
| } |
| |
| void av1_rc_set_gf_interval_range(const AV1_COMP *const cpi, |
| RATE_CONTROL *const rc) { |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| 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 = av1_rc_get_default_min_gf_interval( |
| oxcf->width, oxcf->height, cpi->framerate); |
| if (rc->max_gf_interval == 0) |
| rc->max_gf_interval = |
| av1_rc_get_default_max_gf_interval(cpi->framerate, rc->min_gf_interval); |
| /* |
| * Extended max interval for genuinely static scenes like slide shows. |
| * The no.of.stats available in the case of LAP is limited, |
| * hence setting to max_gf_interval. |
| */ |
| if (cpi->lap_enabled) |
| rc->static_scene_max_gf_interval = rc->max_gf_interval + 1; |
| else |
| rc->static_scene_max_gf_interval = MAX_STATIC_GF_GROUP_LENGTH; |
| |
| 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 = AOMMIN(rc->min_gf_interval, rc->max_gf_interval); |
| } |
| |
| void av1_rc_update_framerate(AV1_COMP *cpi, int width, int height) { |
| const AV1EncoderConfig *const oxcf = &cpi->oxcf; |
| RATE_CONTROL *const rc = &cpi->rc; |
| int vbr_max_bits; |
| const int MBs = av1_get_MBs(width, height); |
| |
| 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 = |
| AOMMAX(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 = |
| AOMMAX(AOMMAX((MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); |
| |
| av1_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(AV1_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; |
| double stats_count = |
| cpi->twopass.total_stats != NULL ? cpi->twopass.total_stats->count : 0.0; |
| |
| // How far through the clip are we. |
| // This number is used to damp the per frame rate correction. |
| // Range 0 - 1.0 |
| if (stats_count != 0.) { |
| position_factor = |
| sqrt((double)cpi->common.current_frame.frame_number / 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 = AOMMAX(rc->avg_frame_bandwidth, *this_frame_target); |
| int fast_extra_bits; |
| fast_extra_bits = (int)AOMMIN(rc->vbr_bits_off_target_fast, one_frame_bits); |
| fast_extra_bits = (int)AOMMIN( |
| fast_extra_bits, |
| AOMMAX(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 av1_set_target_rate(AV1_COMP *cpi, int width, int height) { |
| 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 == AOM_VBR || cpi->oxcf.rc_mode == AOM_CQ) |
| vbr_rate_correction(cpi, &target_rate); |
| av1_rc_set_frame_target(cpi, target_rate, width, height); |
| } |
| |
| int av1_calc_pframe_target_size_one_pass_vbr( |
| const AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type) { |
| static const int af_ratio = 10; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| int target; |
| #if USE_ALTREF_FOR_ONE_PASS |
| if (frame_update_type == KF_UPDATE || frame_update_type == GF_UPDATE || |
| frame_update_type == ARF_UPDATE) { |
| target = (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) / |
| (rc->baseline_gf_interval + af_ratio - 1); |
| } else { |
| target = (rc->avg_frame_bandwidth * rc->baseline_gf_interval) / |
| (rc->baseline_gf_interval + af_ratio - 1); |
| } |
| #else |
| target = rc->avg_frame_bandwidth; |
| #endif |
| return av1_rc_clamp_pframe_target_size(cpi, target, frame_update_type); |
| } |
| |
| int av1_calc_iframe_target_size_one_pass_vbr(const AV1_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 av1_rc_clamp_iframe_target_size(cpi, target); |
| } |
| |
| int av1_calc_pframe_target_size_one_pass_cbr( |
| const AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type) { |
| const AV1EncoderConfig *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 = |
| AOMMAX(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; |
| if (frame_update_type == GF_UPDATE || frame_update_type == OVERLAY_UPDATE) { |
| target = |
| (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) / |
| (rc->baseline_gf_interval * 100 + af_ratio_pct - 100); |
| } else { |
| target = (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)AOMMIN(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)AOMMIN(-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 = AOMMIN(target, max_rate); |
| } |
| return AOMMAX(min_frame_target, target); |
| } |
| |
| int av1_calc_iframe_target_size_one_pass_cbr(const AV1_COMP *cpi) { |
| const RATE_CONTROL *rc = &cpi->rc; |
| int target; |
| if (cpi->common.current_frame.frame_number == 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 = AOMMAX(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 av1_rc_clamp_iframe_target_size(cpi, target); |
| } |
| |
| #define DEFAULT_KF_BOOST_RT 2300 |
| #define DEFAULT_GF_BOOST_RT 2000 |
| |
| void av1_get_one_pass_rt_params(AV1_COMP *cpi, |
| EncodeFrameParams *const frame_params, |
| unsigned int frame_flags) { |
| RATE_CONTROL *const rc = &cpi->rc; |
| AV1_COMMON *const cm = &cpi->common; |
| FRAME_UPDATE_TYPE frame_update_type; |
| int target; |
| if (rc->frames_to_key == 0 || (frame_flags & FRAMEFLAGS_KEY)) { |
| frame_params->frame_type = KEY_FRAME; |
| rc->this_key_frame_forced = |
| cm->current_frame.frame_number != 0 && rc->frames_to_key == 0; |
| rc->frames_to_key = cpi->oxcf.key_freq; |
| rc->frames_to_key = AOMMAX(1, rc->frames_to_key); |
| rc->kf_boost = DEFAULT_KF_BOOST_RT; |
| rc->source_alt_ref_active = 0; |
| frame_update_type = KF_UPDATE; |
| } else { |
| frame_params->frame_type = INTER_FRAME; |
| frame_update_type = LF_UPDATE; |
| } |
| if (rc->frames_till_gf_update_due == 0) { |
| GF_GROUP *const gf_group = &cpi->gf_group; |
| if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) |
| av1_cyclic_refresh_set_golden_update(cpi); |
| else |
| rc->baseline_gf_interval = MAX_GF_INTERVAL; |
| if (rc->baseline_gf_interval > rc->frames_to_key) |
| rc->baseline_gf_interval = rc->frames_to_key; |
| rc->frames_till_gf_update_due = rc->baseline_gf_interval; |
| rc->gfu_boost = DEFAULT_GF_BOOST_RT; |
| rc->constrained_gf_group = |
| (rc->baseline_gf_interval >= rc->frames_to_key) ? 1 : 0; |
| frame_update_type = GF_UPDATE; |
| gf_group->index = 0; |
| gf_group->size = rc->baseline_gf_interval; |
| gf_group->update_type[0] = |
| (frame_params->frame_type == KEY_FRAME) ? KF_UPDATE : GF_UPDATE; |
| for (int i = 1; i < rc->baseline_gf_interval; i++) |
| gf_group->update_type[i] = LF_UPDATE; |
| } |
| if (cpi->oxcf.rc_mode == AOM_CBR) { |
| if (frame_params->frame_type == KEY_FRAME) { |
| target = av1_calc_iframe_target_size_one_pass_cbr(cpi); |
| } else { |
| target = av1_calc_pframe_target_size_one_pass_cbr(cpi, frame_update_type); |
| } |
| } else { |
| if (frame_params->frame_type == KEY_FRAME) { |
| target = av1_calc_iframe_target_size_one_pass_vbr(cpi); |
| } else { |
| target = av1_calc_pframe_target_size_one_pass_vbr(cpi, frame_update_type); |
| } |
| } |
| av1_rc_set_frame_target(cpi, target, cpi->common.width, cpi->common.height); |
| rc->base_frame_target = target; |
| } |