4c4d7261e4
ioc found a potential integer overflow in the rate control. This is related to https://code.google.com/p/webm/issues/detail?id=821 Change-Id: Ib6c4acd6e964972f932fce7490592eb134f2b7ea
1668 lines
62 KiB
C
1668 lines
62 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <assert.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vpx_mem/vpx_mem.h"
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#include "vp9/common/vp9_alloccommon.h"
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#include "vp9/encoder/vp9_aq_cyclicrefresh.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/common/vp9_entropymode.h"
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#include "vp9/common/vp9_quant_common.h"
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#include "vp9/common/vp9_seg_common.h"
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#include "vp9/common/vp9_systemdependent.h"
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#include "vp9/encoder/vp9_encodemv.h"
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#include "vp9/encoder/vp9_ratectrl.h"
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// Max rate target for 1080P and below encodes under normal circumstances
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// (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
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#define MAX_MB_RATE 250
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#define MAXRATE_1080P 2025000
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#define DEFAULT_KF_BOOST 2000
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#define DEFAULT_GF_BOOST 2000
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#define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
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#define MIN_BPB_FACTOR 0.005
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#define MAX_BPB_FACTOR 50
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#define FRAME_OVERHEAD_BITS 200
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#if CONFIG_VP9_HIGHBITDEPTH
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#define ASSIGN_MINQ_TABLE(bit_depth, name) \
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do { \
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switch (bit_depth) { \
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case VPX_BITS_8: \
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name = name##_8; \
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break; \
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case VPX_BITS_10: \
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name = name##_10; \
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break; \
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case VPX_BITS_12: \
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name = name##_12; \
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break; \
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default: \
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assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10" \
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" or VPX_BITS_12"); \
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name = NULL; \
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} \
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} while (0)
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#else
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#define ASSIGN_MINQ_TABLE(bit_depth, name) \
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do { \
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(void) bit_depth; \
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name = name##_8; \
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} while (0)
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#endif
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// Tables relating active max Q to active min Q
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static int kf_low_motion_minq_8[QINDEX_RANGE];
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static int kf_high_motion_minq_8[QINDEX_RANGE];
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static int arfgf_low_motion_minq_8[QINDEX_RANGE];
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static int arfgf_high_motion_minq_8[QINDEX_RANGE];
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static int inter_minq_8[QINDEX_RANGE];
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static int rtc_minq_8[QINDEX_RANGE];
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#if CONFIG_VP9_HIGHBITDEPTH
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static int kf_low_motion_minq_10[QINDEX_RANGE];
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static int kf_high_motion_minq_10[QINDEX_RANGE];
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static int arfgf_low_motion_minq_10[QINDEX_RANGE];
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static int arfgf_high_motion_minq_10[QINDEX_RANGE];
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static int inter_minq_10[QINDEX_RANGE];
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static int rtc_minq_10[QINDEX_RANGE];
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static int kf_low_motion_minq_12[QINDEX_RANGE];
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static int kf_high_motion_minq_12[QINDEX_RANGE];
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static int arfgf_low_motion_minq_12[QINDEX_RANGE];
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static int arfgf_high_motion_minq_12[QINDEX_RANGE];
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static int inter_minq_12[QINDEX_RANGE];
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static int rtc_minq_12[QINDEX_RANGE];
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#endif
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static int gf_high = 2000;
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static int gf_low = 400;
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static int kf_high = 5000;
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static int kf_low = 400;
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// Functions to compute the active minq lookup table entries based on a
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// formulaic approach to facilitate easier adjustment of the Q tables.
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// The formulae were derived from computing a 3rd order polynomial best
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// fit to the original data (after plotting real maxq vs minq (not q index))
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static int get_minq_index(double maxq, double x3, double x2, double x1,
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vpx_bit_depth_t bit_depth) {
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int i;
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const double minqtarget = MIN(((x3 * maxq + x2) * maxq + x1) * maxq,
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maxq);
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// Special case handling to deal with the step from q2.0
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// down to lossless mode represented by q 1.0.
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if (minqtarget <= 2.0)
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return 0;
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for (i = 0; i < QINDEX_RANGE; i++) {
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if (minqtarget <= vp9_convert_qindex_to_q(i, bit_depth))
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return i;
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}
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return QINDEX_RANGE - 1;
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}
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static void init_minq_luts(int *kf_low_m, int *kf_high_m,
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int *arfgf_low, int *arfgf_high,
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int *inter, int *rtc, vpx_bit_depth_t bit_depth) {
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int i;
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for (i = 0; i < QINDEX_RANGE; i++) {
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const double maxq = vp9_convert_qindex_to_q(i, bit_depth);
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kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth);
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kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
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arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
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arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
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inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth);
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rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
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}
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}
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void vp9_rc_init_minq_luts() {
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init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8,
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arfgf_low_motion_minq_8, arfgf_high_motion_minq_8,
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inter_minq_8, rtc_minq_8, VPX_BITS_8);
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#if CONFIG_VP9_HIGHBITDEPTH
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init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10,
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arfgf_low_motion_minq_10, arfgf_high_motion_minq_10,
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inter_minq_10, rtc_minq_10, VPX_BITS_10);
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init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12,
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arfgf_low_motion_minq_12, arfgf_high_motion_minq_12,
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inter_minq_12, rtc_minq_12, VPX_BITS_12);
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#endif
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}
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// These functions use formulaic calculations to make playing with the
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// quantizer tables easier. If necessary they can be replaced by lookup
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// tables if and when things settle down in the experimental bitstream
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double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) {
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// Convert the index to a real Q value (scaled down to match old Q values)
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#if CONFIG_VP9_HIGHBITDEPTH
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switch (bit_depth) {
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case VPX_BITS_8:
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return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
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case VPX_BITS_10:
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return vp9_ac_quant(qindex, 0, bit_depth) / 16.0;
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case VPX_BITS_12:
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return vp9_ac_quant(qindex, 0, bit_depth) / 64.0;
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default:
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assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12");
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return -1.0;
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}
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#else
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return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
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#endif
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}
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int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
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double correction_factor,
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vpx_bit_depth_t bit_depth) {
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const double q = vp9_convert_qindex_to_q(qindex, bit_depth);
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int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000;
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assert(correction_factor <= MAX_BPB_FACTOR &&
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correction_factor >= MIN_BPB_FACTOR);
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// q based adjustment to baseline enumerator
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enumerator += (int)(enumerator * q) >> 12;
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return (int)(enumerator * correction_factor / q);
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}
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int vp9_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
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double correction_factor,
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vpx_bit_depth_t bit_depth) {
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const int bpm = (int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor,
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bit_depth));
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return MAX(FRAME_OVERHEAD_BITS,
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(int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
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}
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int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
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const RATE_CONTROL *rc = &cpi->rc;
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const VP9EncoderConfig *oxcf = &cpi->oxcf;
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const int min_frame_target = MAX(rc->min_frame_bandwidth,
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rc->avg_frame_bandwidth >> 5);
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if (target < min_frame_target)
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target = min_frame_target;
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if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
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// If there is an active ARF at this location use the minimum
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// bits on this frame even if it is a constructed arf.
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// The active maximum quantizer insures that an appropriate
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// number of bits will be spent if needed for constructed ARFs.
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target = min_frame_target;
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}
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// Clip the frame target to the maximum allowed value.
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if (target > rc->max_frame_bandwidth)
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target = rc->max_frame_bandwidth;
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if (oxcf->rc_max_inter_bitrate_pct) {
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const int max_rate = rc->avg_frame_bandwidth *
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oxcf->rc_max_inter_bitrate_pct / 100;
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target = MIN(target, max_rate);
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}
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return target;
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}
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int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
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const RATE_CONTROL *rc = &cpi->rc;
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const VP9EncoderConfig *oxcf = &cpi->oxcf;
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if (oxcf->rc_max_intra_bitrate_pct) {
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const int max_rate = rc->avg_frame_bandwidth *
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oxcf->rc_max_intra_bitrate_pct / 100;
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target = MIN(target, max_rate);
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}
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if (target > rc->max_frame_bandwidth)
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target = rc->max_frame_bandwidth;
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return target;
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}
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// Update the buffer level for higher layers, given the encoded current layer.
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static void update_layer_buffer_level(SVC *svc, int encoded_frame_size) {
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int temporal_layer = 0;
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int current_temporal_layer = svc->temporal_layer_id;
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for (temporal_layer = current_temporal_layer + 1;
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temporal_layer < svc->number_temporal_layers; ++temporal_layer) {
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LAYER_CONTEXT *lc = &svc->layer_context[temporal_layer];
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RATE_CONTROL *lrc = &lc->rc;
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int bits_off_for_this_layer = (int)(lc->target_bandwidth / lc->framerate -
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encoded_frame_size);
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lrc->bits_off_target += bits_off_for_this_layer;
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// Clip buffer level to maximum buffer size for the layer.
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lrc->bits_off_target = MIN(lrc->bits_off_target, lrc->maximum_buffer_size);
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lrc->buffer_level = lrc->bits_off_target;
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}
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}
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// Update the buffer level: leaky bucket model.
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static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
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const VP9_COMMON *const cm = &cpi->common;
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RATE_CONTROL *const rc = &cpi->rc;
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// Non-viewable frames are a special case and are treated as pure overhead.
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if (!cm->show_frame) {
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rc->bits_off_target -= encoded_frame_size;
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} else {
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rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
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}
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// Clip the buffer level to the maximum specified buffer size.
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rc->bits_off_target = MIN(rc->bits_off_target, rc->maximum_buffer_size);
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rc->buffer_level = rc->bits_off_target;
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if (cpi->use_svc && cpi->oxcf.rc_mode == VPX_CBR) {
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update_layer_buffer_level(&cpi->svc, encoded_frame_size);
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}
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}
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void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
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int i;
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if (pass == 0 && oxcf->rc_mode == VPX_CBR) {
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rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
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rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
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} else {
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rc->avg_frame_qindex[KEY_FRAME] = (oxcf->worst_allowed_q +
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oxcf->best_allowed_q) / 2;
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rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
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oxcf->best_allowed_q) / 2;
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}
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rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
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rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
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rc->buffer_level = rc->starting_buffer_level;
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rc->bits_off_target = rc->starting_buffer_level;
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rc->rolling_target_bits = rc->avg_frame_bandwidth;
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rc->rolling_actual_bits = rc->avg_frame_bandwidth;
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rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
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rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
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rc->total_actual_bits = 0;
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rc->total_target_bits = 0;
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rc->total_target_vs_actual = 0;
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rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
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rc->frames_since_key = 8; // Sensible default for first frame.
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rc->this_key_frame_forced = 0;
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rc->next_key_frame_forced = 0;
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rc->source_alt_ref_pending = 0;
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rc->source_alt_ref_active = 0;
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rc->frames_till_gf_update_due = 0;
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rc->ni_av_qi = oxcf->worst_allowed_q;
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rc->ni_tot_qi = 0;
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rc->ni_frames = 0;
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rc->tot_q = 0.0;
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rc->avg_q = vp9_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
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for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
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rc->rate_correction_factors[i] = 1.0;
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}
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}
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int vp9_rc_drop_frame(VP9_COMP *cpi) {
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const VP9EncoderConfig *oxcf = &cpi->oxcf;
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RATE_CONTROL *const rc = &cpi->rc;
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if (!oxcf->drop_frames_water_mark) {
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return 0;
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} else {
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if (rc->buffer_level < 0) {
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// Always drop if buffer is below 0.
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return 1;
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} else {
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// If buffer is below drop_mark, for now just drop every other frame
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// (starting with the next frame) until it increases back over drop_mark.
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int drop_mark = (int)(oxcf->drop_frames_water_mark *
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rc->optimal_buffer_level / 100);
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if ((rc->buffer_level > drop_mark) &&
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(rc->decimation_factor > 0)) {
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--rc->decimation_factor;
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} else if (rc->buffer_level <= drop_mark &&
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rc->decimation_factor == 0) {
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rc->decimation_factor = 1;
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}
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if (rc->decimation_factor > 0) {
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if (rc->decimation_count > 0) {
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--rc->decimation_count;
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return 1;
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} else {
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rc->decimation_count = rc->decimation_factor;
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return 0;
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}
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} else {
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rc->decimation_count = 0;
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return 0;
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}
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}
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}
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}
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static double get_rate_correction_factor(const VP9_COMP *cpi) {
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const RATE_CONTROL *const rc = &cpi->rc;
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if (cpi->common.frame_type == KEY_FRAME) {
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return rc->rate_correction_factors[KF_STD];
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} else if (cpi->oxcf.pass == 2) {
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RATE_FACTOR_LEVEL rf_lvl =
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cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
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return rc->rate_correction_factors[rf_lvl];
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} else {
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if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
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!rc->is_src_frame_alt_ref && !cpi->use_svc &&
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(cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
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return rc->rate_correction_factors[GF_ARF_STD];
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else
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return rc->rate_correction_factors[INTER_NORMAL];
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}
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}
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static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
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RATE_CONTROL *const rc = &cpi->rc;
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if (cpi->common.frame_type == KEY_FRAME) {
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rc->rate_correction_factors[KF_STD] = factor;
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} else if (cpi->oxcf.pass == 2) {
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RATE_FACTOR_LEVEL rf_lvl =
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cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
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rc->rate_correction_factors[rf_lvl] = factor;
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} else {
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if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
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!rc->is_src_frame_alt_ref && !cpi->use_svc &&
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(cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
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rc->rate_correction_factors[GF_ARF_STD] = factor;
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else
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rc->rate_correction_factors[INTER_NORMAL] = factor;
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}
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}
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void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
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const VP9_COMMON *const cm = &cpi->common;
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int correction_factor = 100;
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double rate_correction_factor = get_rate_correction_factor(cpi);
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double adjustment_limit;
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int projected_size_based_on_q = 0;
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// Do not update the rate factors for arf overlay frames.
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if (cpi->rc.is_src_frame_alt_ref)
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return;
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// Clear down mmx registers to allow floating point in what follows
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vp9_clear_system_state();
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// Work out how big we would have expected the frame to be at this Q given
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// the current correction factor.
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// 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 =
|
|
vp9_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
|
|
} else {
|
|
projected_size_based_on_q = vp9_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.
|
|
switch (damp_var) {
|
|
case 0:
|
|
adjustment_limit = 0.75;
|
|
break;
|
|
case 1:
|
|
adjustment_limit = 0.25 +
|
|
0.5 * MIN(1, fabs(log10(0.01 * correction_factor)));
|
|
break;
|
|
case 2:
|
|
default:
|
|
adjustment_limit = 0.25;
|
|
break;
|
|
}
|
|
|
|
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 vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
|
|
int active_best_quality, int active_worst_quality) {
|
|
const VP9_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)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
|
|
} else {
|
|
bits_per_mb_at_this_q = (int)vp9_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, MIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
|
|
MAX(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 VP9_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 MIN(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 VP9_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 VP9_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) ?
|
|
MIN(rc->avg_frame_qindex[INTER_FRAME], rc->avg_frame_qindex[KEY_FRAME]) :
|
|
rc->avg_frame_qindex[INTER_FRAME];
|
|
active_worst_quality = MIN(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 VP9_COMP *cpi,
|
|
int *bottom_index,
|
|
int *top_index) {
|
|
const VP9_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 = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
|
|
int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
|
|
(last_boosted_q * 0.75),
|
|
cm->bit_depth);
|
|
active_best_quality = MAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
|
|
active_best_quality += vp9_compute_qdelta(rc, q_val,
|
|
q_val * q_adj_factor,
|
|
cm->bit_depth);
|
|
}
|
|
} else if (!rc->is_src_frame_alt_ref &&
|
|
!cpi->use_svc &&
|
|
(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;
|
|
vp9_clear_system_state();
|
|
qdelta = vp9_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 = vp9_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 VP9EncoderConfig *const oxcf) {
|
|
static const double cq_adjust_threshold = 0.5;
|
|
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 VP9_COMP *cpi,
|
|
int *bottom_index,
|
|
int *top_index) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
const RATE_CONTROL *const rc = &cpi->rc;
|
|
const VP9EncoderConfig *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)) {
|
|
|
|
// 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 = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
|
|
int delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
|
|
last_boosted_q * 0.75,
|
|
cm->bit_depth);
|
|
active_best_quality = MAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
|
|
active_best_quality += vp9_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) {
|
|
if (!cpi->refresh_alt_ref_frame) {
|
|
active_best_quality = cq_level;
|
|
} else {
|
|
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
|
|
}
|
|
} 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 {
|
|
// 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;
|
|
vp9_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 = vp9_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 = vp9_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 = vp9_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;
|
|
}
|
|
|
|
#define STATIC_MOTION_THRESH 95
|
|
static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
|
|
int *bottom_index,
|
|
int *top_index) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
const RATE_CONTROL *const rc = &cpi->rc;
|
|
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
|
|
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) || vp9_is_upper_layer_key_frame(cpi)) {
|
|
// 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 = MIN(rc->last_kf_qindex, rc->last_boosted_qindex);
|
|
active_best_quality = qindex;
|
|
last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
|
|
delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
|
|
last_boosted_q * 1.25,
|
|
cm->bit_depth);
|
|
active_worst_quality = MIN(qindex + delta_qindex, active_worst_quality);
|
|
|
|
} else {
|
|
qindex = rc->last_boosted_qindex;
|
|
last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
|
|
delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
|
|
last_boosted_q * 0.75,
|
|
cm->bit_depth);
|
|
active_best_quality = MAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
|
|
active_best_quality += vp9_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 {
|
|
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Extenstion to max or min Q if undershoot or overshoot is outside
|
|
// the permitted range.
|
|
if ((cpi->oxcf.rc_mode == VPX_VBR) &&
|
|
(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;
|
|
active_worst_quality += (cpi->twopass.extend_maxq / 2);
|
|
} else {
|
|
active_best_quality -= cpi->twopass.extend_minq / 2;
|
|
active_worst_quality += cpi->twopass.extend_maxq;
|
|
}
|
|
}
|
|
|
|
#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
|
|
vp9_clear_system_state();
|
|
// Static forced key frames Q restrictions dealt with elsewhere.
|
|
if (!((frame_is_intra_only(cm) || vp9_is_upper_layer_key_frame(cpi))) ||
|
|
!rc->this_key_frame_forced ||
|
|
(cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
|
|
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
|
|
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
|
|
};
|
|
const double rate_factor =
|
|
rate_factor_deltas[gf_group->rf_level[gf_group->index]];
|
|
int qdelta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type,
|
|
active_worst_quality, rate_factor,
|
|
cm->bit_depth);
|
|
active_worst_quality = active_worst_quality + qdelta;
|
|
active_worst_quality = MAX(active_worst_quality, active_best_quality);
|
|
}
|
|
#endif
|
|
|
|
// 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);
|
|
|
|
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) || vp9_is_upper_layer_key_frame(cpi)) &&
|
|
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 = MIN(rc->last_kf_qindex, rc->last_boosted_qindex);
|
|
} else {
|
|
q = rc->last_boosted_qindex;
|
|
}
|
|
} else {
|
|
q = vp9_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 vp9_rc_pick_q_and_bounds(const VP9_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);
|
|
}
|
|
if (cpi->sf.use_nonrd_pick_mode) {
|
|
if (cpi->sf.force_frame_boost == 1)
|
|
q -= cpi->sf.max_delta_qindex;
|
|
|
|
if (q < *bottom_index)
|
|
*bottom_index = q;
|
|
else if (q > *top_index)
|
|
*top_index = q;
|
|
}
|
|
return q;
|
|
}
|
|
|
|
void vp9_rc_compute_frame_size_bounds(const VP9_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 = MAX(frame_target - tolerance - 200, 0);
|
|
*frame_over_shoot_limit = MIN(frame_target + tolerance + 200,
|
|
cpi->rc.max_frame_bandwidth);
|
|
}
|
|
}
|
|
|
|
void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
RATE_CONTROL *const rc = &cpi->rc;
|
|
|
|
rc->this_frame_target = target;
|
|
|
|
// 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(VP9_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(VP9_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 (cpi->oxcf.pass == 2) {
|
|
if (!rc->source_alt_ref_pending &&
|
|
cpi->twopass.gf_group.rf_level[0] == GF_ARF_STD)
|
|
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 vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
const VP9EncoderConfig *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) {
|
|
vp9_cyclic_refresh_update_actual_count(cpi);
|
|
}
|
|
|
|
// Update rate control heuristics
|
|
rc->projected_frame_size = (int)(bytes_used << 3);
|
|
|
|
// Post encode loop adjustment of Q prediction.
|
|
vp9_rc_update_rate_correction_factors(
|
|
cpi, (cpi->sf.recode_loop >= ALLOW_RECODE_KFARFGF) ? 2 :
|
|
((oxcf->rc_mode == VPX_CBR) ? 1 : 0));
|
|
|
|
// 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) ||
|
|
(cpi->use_svc && oxcf->rc_mode == VPX_CBR)) {
|
|
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 += vp9_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) || 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--;
|
|
}
|
|
}
|
|
|
|
void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
|
|
// Update buffer level with zero size, update frame counters, and return.
|
|
update_buffer_level(cpi, 0);
|
|
cpi->common.last_frame_type = cpi->common.frame_type;
|
|
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 VP9_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 vp9_rc_clamp_pframe_target_size(cpi, target);
|
|
}
|
|
|
|
static int calc_iframe_target_size_one_pass_vbr(const VP9_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 vp9_rc_clamp_iframe_target_size(cpi, target);
|
|
}
|
|
|
|
void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
|
|
VP9_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 = DEFAULT_GF_INTERVAL;
|
|
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->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);
|
|
vp9_rc_set_frame_target(cpi, target);
|
|
}
|
|
|
|
static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
|
|
const VP9EncoderConfig *oxcf = &cpi->oxcf;
|
|
const RATE_CONTROL *rc = &cpi->rc;
|
|
const SVC *const svc = &cpi->svc;
|
|
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 = MAX(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 (svc->number_temporal_layers > 1 &&
|
|
oxcf->rc_mode == VPX_CBR) {
|
|
// Note that for layers, avg_frame_bandwidth is the cumulative
|
|
// per-frame-bandwidth. For the target size of this frame, use the
|
|
// layer average frame size (i.e., non-cumulative per-frame-bw).
|
|
int current_temporal_layer = svc->temporal_layer_id;
|
|
const LAYER_CONTEXT *lc = &svc->layer_context[current_temporal_layer];
|
|
target = lc->avg_frame_size;
|
|
min_frame_target = MAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
|
|
}
|
|
if (diff > 0) {
|
|
// Lower the target bandwidth for this frame.
|
|
const int pct_low = (int)MIN(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)MIN(-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 = MIN(target, max_rate);
|
|
}
|
|
return MAX(min_frame_target, target);
|
|
}
|
|
|
|
static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
|
|
const RATE_CONTROL *rc = &cpi->rc;
|
|
const VP9EncoderConfig *oxcf = &cpi->oxcf;
|
|
const SVC *const svc = &cpi->svc;
|
|
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;
|
|
if (svc->number_temporal_layers > 1 &&
|
|
oxcf->rc_mode == VPX_CBR) {
|
|
// Use the layer framerate for temporal layers CBR mode.
|
|
const LAYER_CONTEXT *lc = &svc->layer_context[svc->temporal_layer_id];
|
|
framerate = lc->framerate;
|
|
}
|
|
kf_boost = MAX(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 vp9_rc_clamp_iframe_target_size(cpi, target);
|
|
}
|
|
|
|
void vp9_rc_get_svc_params(VP9_COMP *cpi) {
|
|
VP9_COMMON *const cm = &cpi->common;
|
|
RATE_CONTROL *const rc = &cpi->rc;
|
|
int target = rc->avg_frame_bandwidth;
|
|
if ((cm->current_video_frame == 0) ||
|
|
(cpi->frame_flags & FRAMEFLAGS_KEY) ||
|
|
(cpi->oxcf.auto_key && (rc->frames_since_key %
|
|
cpi->oxcf.key_freq == 0))) {
|
|
cm->frame_type = KEY_FRAME;
|
|
rc->source_alt_ref_active = 0;
|
|
|
|
if (is_two_pass_svc(cpi)) {
|
|
cpi->svc.layer_context[cpi->svc.spatial_layer_id].is_key_frame = 1;
|
|
cpi->ref_frame_flags &=
|
|
(~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
|
|
}
|
|
|
|
if (cpi->oxcf.pass == 0 && cpi->oxcf.rc_mode == VPX_CBR) {
|
|
target = calc_iframe_target_size_one_pass_cbr(cpi);
|
|
}
|
|
} else {
|
|
cm->frame_type = INTER_FRAME;
|
|
|
|
if (is_two_pass_svc(cpi)) {
|
|
LAYER_CONTEXT *lc = &cpi->svc.layer_context[cpi->svc.spatial_layer_id];
|
|
if (cpi->svc.spatial_layer_id == 0) {
|
|
lc->is_key_frame = 0;
|
|
} else {
|
|
lc->is_key_frame = cpi->svc.layer_context[0].is_key_frame;
|
|
if (lc->is_key_frame)
|
|
cpi->ref_frame_flags &= (~VP9_LAST_FLAG);
|
|
}
|
|
cpi->ref_frame_flags &= (~VP9_ALT_FLAG);
|
|
}
|
|
|
|
if (cpi->oxcf.pass == 0 && cpi->oxcf.rc_mode == VPX_CBR) {
|
|
target = calc_pframe_target_size_one_pass_cbr(cpi);
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
vp9_cyclic_refresh_update_parameters(cpi);
|
|
|
|
vp9_rc_set_frame_target(cpi, target);
|
|
rc->frames_till_gf_update_due = INT_MAX;
|
|
rc->baseline_gf_interval = INT_MAX;
|
|
}
|
|
|
|
void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
|
|
VP9_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) {
|
|
rc->baseline_gf_interval = DEFAULT_GF_INTERVAL;
|
|
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)
|
|
vp9_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);
|
|
|
|
vp9_rc_set_frame_target(cpi, target);
|
|
}
|
|
|
|
int vp9_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 (vp9_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 (vp9_convert_qindex_to_q(i, bit_depth) >= qtarget)
|
|
break;
|
|
}
|
|
|
|
return target_index - start_index;
|
|
}
|
|
|
|
int vp9_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 = vp9_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) {
|
|
target_index = i;
|
|
if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <= target_bits_per_mb)
|
|
break;
|
|
}
|
|
|
|
return target_index - qindex;
|
|
}
|
|
|
|
void vp9_rc_set_gf_max_interval(const VP9_COMP *const cpi,
|
|
RATE_CONTROL *const rc) {
|
|
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
|
|
// Set Maximum gf/arf interval
|
|
rc->max_gf_interval = 16;
|
|
|
|
// 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;
|
|
}
|
|
|
|
void vp9_rc_update_framerate(VP9_COMP *cpi) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
const VP9EncoderConfig *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 = MAX(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 = MAX(MAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P),
|
|
vbr_max_bits);
|
|
|
|
vp9_rc_set_gf_max_interval(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(VP9_COMP *cpi,
|
|
int *this_frame_target,
|
|
int64_t 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;
|
|
}
|
|
}
|
|
|
|
void vp9_set_target_rate(VP9_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)
|
|
vbr_rate_correction(cpi, &target_rate, rc->vbr_bits_off_target);
|
|
vp9_rc_set_frame_target(cpi, target_rate);
|
|
}
|