1028 lines
34 KiB
C
Executable file
1028 lines
34 KiB
C
Executable file
/*
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* Rate control for video encoders
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*
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Rate control for video encoders.
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/internal.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "ratecontrol.h"
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "libavutil/eval.h"
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void ff_write_pass1_stats(MpegEncContext *s)
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{
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snprintf(s->avctx->stats_out, 256,
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"in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d "
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"fcode:%d bcode:%d mc-var:%"PRId64" var:%"PRId64" icount:%d skipcount:%d hbits:%d;\n",
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s->current_picture_ptr->f->display_picture_number,
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s->current_picture_ptr->f->coded_picture_number,
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s->pict_type,
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s->current_picture.f->quality,
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s->i_tex_bits,
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s->p_tex_bits,
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s->mv_bits,
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s->misc_bits,
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s->f_code,
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s->b_code,
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s->current_picture.mc_mb_var_sum,
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s->current_picture.mb_var_sum,
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s->i_count, s->skip_count,
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s->header_bits);
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}
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static double get_fps(AVCodecContext *avctx)
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{
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return 1.0 / av_q2d(avctx->time_base) / FFMAX(avctx->ticks_per_frame, 1);
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}
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static inline double qp2bits(RateControlEntry *rce, double qp)
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{
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if (qp <= 0.0) {
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av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
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}
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / qp;
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}
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static inline double bits2qp(RateControlEntry *rce, double bits)
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{
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if (bits < 0.9) {
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av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
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}
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / bits;
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}
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static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q)
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{
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RateControlContext *rcc = &s->rc_context;
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AVCodecContext *a = s->avctx;
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const int pict_type = rce->new_pict_type;
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const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P];
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const double last_non_b_q = rcc->last_qscale_for[rcc->last_non_b_pict_type];
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if (pict_type == AV_PICTURE_TYPE_I &&
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(a->i_quant_factor > 0.0 || rcc->last_non_b_pict_type == AV_PICTURE_TYPE_P))
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q = last_p_q * FFABS(a->i_quant_factor) + a->i_quant_offset;
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else if (pict_type == AV_PICTURE_TYPE_B &&
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a->b_quant_factor > 0.0)
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q = last_non_b_q * a->b_quant_factor + a->b_quant_offset;
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if (q < 1)
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q = 1;
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/* last qscale / qdiff stuff */
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if (rcc->last_non_b_pict_type == pict_type || pict_type != AV_PICTURE_TYPE_I) {
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double last_q = rcc->last_qscale_for[pict_type];
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const int maxdiff = FF_QP2LAMBDA * a->max_qdiff;
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if (q > last_q + maxdiff)
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q = last_q + maxdiff;
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else if (q < last_q - maxdiff)
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q = last_q - maxdiff;
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}
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rcc->last_qscale_for[pict_type] = q; // Note we cannot do that after blurring
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if (pict_type != AV_PICTURE_TYPE_B)
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rcc->last_non_b_pict_type = pict_type;
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return q;
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}
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/**
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* Get the qmin & qmax for pict_type.
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*/
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static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type)
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{
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int qmin = s->lmin;
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int qmax = s->lmax;
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av_assert0(qmin <= qmax);
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switch (pict_type) {
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case AV_PICTURE_TYPE_B:
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qmin = (int)(qmin * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);
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qmax = (int)(qmax * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);
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break;
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case AV_PICTURE_TYPE_I:
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qmin = (int)(qmin * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);
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qmax = (int)(qmax * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);
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break;
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}
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qmin = av_clip(qmin, 1, FF_LAMBDA_MAX);
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qmax = av_clip(qmax, 1, FF_LAMBDA_MAX);
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if (qmax < qmin)
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qmax = qmin;
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*qmin_ret = qmin;
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*qmax_ret = qmax;
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}
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static double modify_qscale(MpegEncContext *s, RateControlEntry *rce,
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double q, int frame_num)
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{
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RateControlContext *rcc = &s->rc_context;
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const double buffer_size = s->avctx->rc_buffer_size;
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const double fps = get_fps(s->avctx);
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const double min_rate = s->avctx->rc_min_rate / fps;
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const double max_rate = s->avctx->rc_max_rate / fps;
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const int pict_type = rce->new_pict_type;
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int qmin, qmax;
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get_qminmax(&qmin, &qmax, s, pict_type);
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/* modulation */
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if (s->rc_qmod_freq &&
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frame_num % s->rc_qmod_freq == 0 &&
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pict_type == AV_PICTURE_TYPE_P)
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q *= s->rc_qmod_amp;
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/* buffer overflow/underflow protection */
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if (buffer_size) {
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double expected_size = rcc->buffer_index;
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double q_limit;
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if (min_rate) {
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double d = 2 * (buffer_size - expected_size) / buffer_size;
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if (d > 1.0)
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d = 1.0;
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else if (d < 0.0001)
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d = 0.0001;
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q *= pow(d, 1.0 / s->rc_buffer_aggressivity);
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q_limit = bits2qp(rce,
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FFMAX((min_rate - buffer_size + rcc->buffer_index) *
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s->avctx->rc_min_vbv_overflow_use, 1));
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if (q > q_limit) {
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if (s->avctx->debug & FF_DEBUG_RC)
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av_log(s->avctx, AV_LOG_DEBUG,
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"limiting QP %f -> %f\n", q, q_limit);
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q = q_limit;
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}
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}
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if (max_rate) {
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double d = 2 * expected_size / buffer_size;
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if (d > 1.0)
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d = 1.0;
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else if (d < 0.0001)
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d = 0.0001;
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q /= pow(d, 1.0 / s->rc_buffer_aggressivity);
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q_limit = bits2qp(rce,
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FFMAX(rcc->buffer_index *
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s->avctx->rc_max_available_vbv_use,
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1));
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if (q < q_limit) {
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if (s->avctx->debug & FF_DEBUG_RC)
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av_log(s->avctx, AV_LOG_DEBUG,
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"limiting QP %f -> %f\n", q, q_limit);
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q = q_limit;
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}
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}
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}
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ff_dlog(s, "q:%f max:%f min:%f size:%f index:%f agr:%f\n",
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q, max_rate, min_rate, buffer_size, rcc->buffer_index,
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s->rc_buffer_aggressivity);
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if (s->rc_qsquish == 0.0 || qmin == qmax) {
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if (q < qmin)
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q = qmin;
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else if (q > qmax)
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q = qmax;
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} else {
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double min2 = log(qmin);
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double max2 = log(qmax);
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q = log(q);
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q = (q - min2) / (max2 - min2) - 0.5;
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q *= -4.0;
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q = 1.0 / (1.0 + exp(q));
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q = q * (max2 - min2) + min2;
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q = exp(q);
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}
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return q;
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}
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/**
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* Modify the bitrate curve from pass1 for one frame.
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*/
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static double get_qscale(MpegEncContext *s, RateControlEntry *rce,
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double rate_factor, int frame_num)
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{
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RateControlContext *rcc = &s->rc_context;
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AVCodecContext *a = s->avctx;
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const int pict_type = rce->new_pict_type;
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const double mb_num = s->mb_num;
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double q, bits;
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int i;
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double const_values[] = {
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M_PI,
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M_E,
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rce->i_tex_bits * rce->qscale,
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rce->p_tex_bits * rce->qscale,
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(rce->i_tex_bits + rce->p_tex_bits) * (double)rce->qscale,
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rce->mv_bits / mb_num,
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rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code) * 0.5 : rce->f_code,
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rce->i_count / mb_num,
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rce->mc_mb_var_sum / mb_num,
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rce->mb_var_sum / mb_num,
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rce->pict_type == AV_PICTURE_TYPE_I,
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rce->pict_type == AV_PICTURE_TYPE_P,
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rce->pict_type == AV_PICTURE_TYPE_B,
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rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
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a->qcompress,
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rcc->i_cplx_sum[AV_PICTURE_TYPE_I] / (double)rcc->frame_count[AV_PICTURE_TYPE_I],
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rcc->i_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
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rcc->p_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
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rcc->p_cplx_sum[AV_PICTURE_TYPE_B] / (double)rcc->frame_count[AV_PICTURE_TYPE_B],
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(rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
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0
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};
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bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);
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if (isnan(bits)) {
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av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->rc_eq);
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return -1;
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}
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rcc->pass1_rc_eq_output_sum += bits;
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bits *= rate_factor;
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if (bits < 0.0)
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bits = 0.0;
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bits += 1.0; // avoid 1/0 issues
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/* user override */
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for (i = 0; i < s->avctx->rc_override_count; i++) {
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RcOverride *rco = s->avctx->rc_override;
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if (rco[i].start_frame > frame_num)
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continue;
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if (rco[i].end_frame < frame_num)
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continue;
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if (rco[i].qscale)
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bits = qp2bits(rce, rco[i].qscale); // FIXME move at end to really force it?
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else
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bits *= rco[i].quality_factor;
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}
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q = bits2qp(rce, bits);
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/* I/B difference */
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if (pict_type == AV_PICTURE_TYPE_I && s->avctx->i_quant_factor < 0.0)
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q = -q * s->avctx->i_quant_factor + s->avctx->i_quant_offset;
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else if (pict_type == AV_PICTURE_TYPE_B && s->avctx->b_quant_factor < 0.0)
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q = -q * s->avctx->b_quant_factor + s->avctx->b_quant_offset;
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if (q < 1)
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q = 1;
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return q;
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}
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static int init_pass2(MpegEncContext *s)
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{
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RateControlContext *rcc = &s->rc_context;
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AVCodecContext *a = s->avctx;
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int i, toobig;
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double fps = get_fps(s->avctx);
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double complexity[5] = { 0 }; // approximate bits at quant=1
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uint64_t const_bits[5] = { 0 }; // quantizer independent bits
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uint64_t all_const_bits;
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uint64_t all_available_bits = (uint64_t)(s->bit_rate *
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(double)rcc->num_entries / fps);
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double rate_factor = 0;
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double step;
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const int filter_size = (int)(a->qblur * 4) | 1;
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double expected_bits = 0; // init to silence gcc warning
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double *qscale, *blurred_qscale, qscale_sum;
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/* find complexity & const_bits & decide the pict_types */
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for (i = 0; i < rcc->num_entries; i++) {
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RateControlEntry *rce = &rcc->entry[i];
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rce->new_pict_type = rce->pict_type;
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rcc->i_cplx_sum[rce->pict_type] += rce->i_tex_bits * rce->qscale;
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rcc->p_cplx_sum[rce->pict_type] += rce->p_tex_bits * rce->qscale;
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rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
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rcc->frame_count[rce->pict_type]++;
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complexity[rce->new_pict_type] += (rce->i_tex_bits + rce->p_tex_bits) *
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(double)rce->qscale;
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const_bits[rce->new_pict_type] += rce->mv_bits + rce->misc_bits;
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}
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all_const_bits = const_bits[AV_PICTURE_TYPE_I] +
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const_bits[AV_PICTURE_TYPE_P] +
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const_bits[AV_PICTURE_TYPE_B];
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if (all_available_bits < all_const_bits) {
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av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
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return -1;
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}
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qscale = av_malloc_array(rcc->num_entries, sizeof(double));
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blurred_qscale = av_malloc_array(rcc->num_entries, sizeof(double));
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if (!qscale || !blurred_qscale) {
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av_free(qscale);
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av_free(blurred_qscale);
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return AVERROR(ENOMEM);
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}
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toobig = 0;
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for (step = 256 * 256; step > 0.0000001; step *= 0.5) {
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expected_bits = 0;
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rate_factor += step;
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rcc->buffer_index = s->avctx->rc_buffer_size / 2;
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/* find qscale */
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for (i = 0; i < rcc->num_entries; i++) {
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RateControlEntry *rce = &rcc->entry[i];
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qscale[i] = get_qscale(s, &rcc->entry[i], rate_factor, i);
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rcc->last_qscale_for[rce->pict_type] = qscale[i];
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}
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av_assert0(filter_size % 2 == 1);
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/* fixed I/B QP relative to P mode */
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for (i = FFMAX(0, rcc->num_entries - 300); i < rcc->num_entries; i++) {
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RateControlEntry *rce = &rcc->entry[i];
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qscale[i] = get_diff_limited_q(s, rce, qscale[i]);
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}
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for (i = rcc->num_entries - 1; i >= 0; i--) {
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RateControlEntry *rce = &rcc->entry[i];
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qscale[i] = get_diff_limited_q(s, rce, qscale[i]);
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}
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/* smooth curve */
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for (i = 0; i < rcc->num_entries; i++) {
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RateControlEntry *rce = &rcc->entry[i];
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const int pict_type = rce->new_pict_type;
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int j;
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double q = 0.0, sum = 0.0;
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for (j = 0; j < filter_size; j++) {
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int index = i + j - filter_size / 2;
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double d = index - i;
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double coeff = a->qblur == 0 ? 1.0 : exp(-d * d / (a->qblur * a->qblur));
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if (index < 0 || index >= rcc->num_entries)
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continue;
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if (pict_type != rcc->entry[index].new_pict_type)
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continue;
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q += qscale[index] * coeff;
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sum += coeff;
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}
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blurred_qscale[i] = q / sum;
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}
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/* find expected bits */
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for (i = 0; i < rcc->num_entries; i++) {
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RateControlEntry *rce = &rcc->entry[i];
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double bits;
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rce->new_qscale = modify_qscale(s, rce, blurred_qscale[i], i);
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bits = qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
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bits += 8 * ff_vbv_update(s, bits);
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rce->expected_bits = expected_bits;
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expected_bits += bits;
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}
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ff_dlog(s->avctx,
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"expected_bits: %f all_available_bits: %d rate_factor: %f\n",
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expected_bits, (int)all_available_bits, rate_factor);
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if (expected_bits > all_available_bits) {
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rate_factor -= step;
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++toobig;
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}
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}
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av_free(qscale);
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av_free(blurred_qscale);
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/* check bitrate calculations and print info */
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qscale_sum = 0.0;
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for (i = 0; i < rcc->num_entries; i++) {
|
|
ff_dlog(s, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
|
|
i,
|
|
rcc->entry[i].new_qscale,
|
|
rcc->entry[i].new_qscale / FF_QP2LAMBDA);
|
|
qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA,
|
|
s->avctx->qmin, s->avctx->qmax);
|
|
}
|
|
av_assert0(toobig <= 40);
|
|
av_log(s->avctx, AV_LOG_DEBUG,
|
|
"[lavc rc] requested bitrate: %"PRId64" bps expected bitrate: %"PRId64" bps\n",
|
|
s->bit_rate,
|
|
(int64_t)(expected_bits / ((double)all_available_bits / s->bit_rate)));
|
|
av_log(s->avctx, AV_LOG_DEBUG,
|
|
"[lavc rc] estimated target average qp: %.3f\n",
|
|
(float)qscale_sum / rcc->num_entries);
|
|
if (toobig == 0) {
|
|
av_log(s->avctx, AV_LOG_INFO,
|
|
"[lavc rc] Using all of requested bitrate is not "
|
|
"necessary for this video with these parameters.\n");
|
|
} else if (toobig == 40) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"[lavc rc] Error: bitrate too low for this video "
|
|
"with these parameters.\n");
|
|
return -1;
|
|
} else if (fabs(expected_bits / all_available_bits - 1.0) > 0.01) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"[lavc rc] Error: 2pass curve failed to converge\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold int ff_rate_control_init(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc = &s->rc_context;
|
|
int i, res;
|
|
static const char * const const_names[] = {
|
|
"PI",
|
|
"E",
|
|
"iTex",
|
|
"pTex",
|
|
"tex",
|
|
"mv",
|
|
"fCode",
|
|
"iCount",
|
|
"mcVar",
|
|
"var",
|
|
"isI",
|
|
"isP",
|
|
"isB",
|
|
"avgQP",
|
|
"qComp",
|
|
"avgIITex",
|
|
"avgPITex",
|
|
"avgPPTex",
|
|
"avgBPTex",
|
|
"avgTex",
|
|
NULL
|
|
};
|
|
static double (* const func1[])(void *, double) = {
|
|
(double (*)(void *, double)) bits2qp,
|
|
(double (*)(void *, double)) qp2bits,
|
|
NULL
|
|
};
|
|
static const char * const func1_names[] = {
|
|
"bits2qp",
|
|
"qp2bits",
|
|
NULL
|
|
};
|
|
emms_c();
|
|
|
|
if (!s->avctx->rc_max_available_vbv_use && s->avctx->rc_buffer_size) {
|
|
if (s->avctx->rc_max_rate) {
|
|
s->avctx->rc_max_available_vbv_use = av_clipf(s->avctx->rc_max_rate/(s->avctx->rc_buffer_size*get_fps(s->avctx)), 1.0/3, 1.0);
|
|
} else
|
|
s->avctx->rc_max_available_vbv_use = 1.0;
|
|
}
|
|
|
|
res = av_expr_parse(&rcc->rc_eq_eval,
|
|
s->rc_eq ? s->rc_eq : "tex^qComp",
|
|
const_names, func1_names, func1,
|
|
NULL, NULL, 0, s->avctx);
|
|
if (res < 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->rc_eq);
|
|
return res;
|
|
}
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
rcc->pred[i].coeff = FF_QP2LAMBDA * 7.0;
|
|
rcc->pred[i].count = 1.0;
|
|
rcc->pred[i].decay = 0.4;
|
|
|
|
rcc->i_cplx_sum [i] =
|
|
rcc->p_cplx_sum [i] =
|
|
rcc->mv_bits_sum[i] =
|
|
rcc->qscale_sum [i] =
|
|
rcc->frame_count[i] = 1; // 1 is better because of 1/0 and such
|
|
|
|
rcc->last_qscale_for[i] = FF_QP2LAMBDA * 5;
|
|
}
|
|
rcc->buffer_index = s->avctx->rc_initial_buffer_occupancy;
|
|
if (!rcc->buffer_index)
|
|
rcc->buffer_index = s->avctx->rc_buffer_size * 3 / 4;
|
|
|
|
if (s->avctx->flags & AV_CODEC_FLAG_PASS2) {
|
|
int i;
|
|
char *p;
|
|
|
|
/* find number of pics */
|
|
p = s->avctx->stats_in;
|
|
for (i = -1; p; i++)
|
|
p = strchr(p + 1, ';');
|
|
i += s->max_b_frames;
|
|
if (i <= 0 || i >= INT_MAX / sizeof(RateControlEntry))
|
|
return -1;
|
|
rcc->entry = av_mallocz(i * sizeof(RateControlEntry));
|
|
if (!rcc->entry)
|
|
return AVERROR(ENOMEM);
|
|
rcc->num_entries = i;
|
|
|
|
/* init all to skipped P-frames
|
|
* (with B-frames we might have a not encoded frame at the end FIXME) */
|
|
for (i = 0; i < rcc->num_entries; i++) {
|
|
RateControlEntry *rce = &rcc->entry[i];
|
|
|
|
rce->pict_type = rce->new_pict_type = AV_PICTURE_TYPE_P;
|
|
rce->qscale = rce->new_qscale = FF_QP2LAMBDA * 2;
|
|
rce->misc_bits = s->mb_num + 10;
|
|
rce->mb_var_sum = s->mb_num * 100;
|
|
}
|
|
|
|
/* read stats */
|
|
p = s->avctx->stats_in;
|
|
for (i = 0; i < rcc->num_entries - s->max_b_frames; i++) {
|
|
RateControlEntry *rce;
|
|
int picture_number;
|
|
int e;
|
|
char *next;
|
|
|
|
next = strchr(p, ';');
|
|
if (next) {
|
|
(*next) = 0; // sscanf is unbelievably slow on looong strings // FIXME copy / do not write
|
|
next++;
|
|
}
|
|
e = sscanf(p, " in:%d ", &picture_number);
|
|
|
|
av_assert0(picture_number >= 0);
|
|
av_assert0(picture_number < rcc->num_entries);
|
|
rce = &rcc->entry[picture_number];
|
|
|
|
e += sscanf(p, " in:%*d out:%*d type:%d q:%f itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%"SCNd64" var:%"SCNd64" icount:%d skipcount:%d hbits:%d",
|
|
&rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits,
|
|
&rce->mv_bits, &rce->misc_bits,
|
|
&rce->f_code, &rce->b_code,
|
|
&rce->mc_mb_var_sum, &rce->mb_var_sum,
|
|
&rce->i_count, &rce->skip_count, &rce->header_bits);
|
|
if (e != 14) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"statistics are damaged at line %d, parser out=%d\n",
|
|
i, e);
|
|
return -1;
|
|
}
|
|
|
|
p = next;
|
|
}
|
|
|
|
if (init_pass2(s) < 0) {
|
|
ff_rate_control_uninit(s);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (!(s->avctx->flags & AV_CODEC_FLAG_PASS2)) {
|
|
rcc->short_term_qsum = 0.001;
|
|
rcc->short_term_qcount = 0.001;
|
|
|
|
rcc->pass1_rc_eq_output_sum = 0.001;
|
|
rcc->pass1_wanted_bits = 0.001;
|
|
|
|
if (s->avctx->qblur > 1.0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
|
|
return -1;
|
|
}
|
|
/* init stuff with the user specified complexity */
|
|
if (s->rc_initial_cplx) {
|
|
for (i = 0; i < 60 * 30; i++) {
|
|
double bits = s->rc_initial_cplx * (i / 10000.0 + 1.0) * s->mb_num;
|
|
RateControlEntry rce;
|
|
|
|
if (i % ((s->gop_size + 3) / 4) == 0)
|
|
rce.pict_type = AV_PICTURE_TYPE_I;
|
|
else if (i % (s->max_b_frames + 1))
|
|
rce.pict_type = AV_PICTURE_TYPE_B;
|
|
else
|
|
rce.pict_type = AV_PICTURE_TYPE_P;
|
|
|
|
rce.new_pict_type = rce.pict_type;
|
|
rce.mc_mb_var_sum = bits * s->mb_num / 100000;
|
|
rce.mb_var_sum = s->mb_num;
|
|
|
|
rce.qscale = FF_QP2LAMBDA * 2;
|
|
rce.f_code = 2;
|
|
rce.b_code = 1;
|
|
rce.misc_bits = 1;
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_I) {
|
|
rce.i_count = s->mb_num;
|
|
rce.i_tex_bits = bits;
|
|
rce.p_tex_bits = 0;
|
|
rce.mv_bits = 0;
|
|
} else {
|
|
rce.i_count = 0; // FIXME we do know this approx
|
|
rce.i_tex_bits = 0;
|
|
rce.p_tex_bits = bits * 0.9;
|
|
rce.mv_bits = bits * 0.1;
|
|
}
|
|
rcc->i_cplx_sum[rce.pict_type] += rce.i_tex_bits * rce.qscale;
|
|
rcc->p_cplx_sum[rce.pict_type] += rce.p_tex_bits * rce.qscale;
|
|
rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
|
|
rcc->frame_count[rce.pict_type]++;
|
|
|
|
get_qscale(s, &rce, rcc->pass1_wanted_bits / rcc->pass1_rc_eq_output_sum, i);
|
|
|
|
// FIXME misbehaves a little for variable fps
|
|
rcc->pass1_wanted_bits += s->bit_rate / get_fps(s->avctx);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_cold void ff_rate_control_uninit(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc = &s->rc_context;
|
|
emms_c();
|
|
|
|
av_expr_free(rcc->rc_eq_eval);
|
|
av_freep(&rcc->entry);
|
|
}
|
|
|
|
int ff_vbv_update(MpegEncContext *s, int frame_size)
|
|
{
|
|
RateControlContext *rcc = &s->rc_context;
|
|
const double fps = get_fps(s->avctx);
|
|
const int buffer_size = s->avctx->rc_buffer_size;
|
|
const double min_rate = s->avctx->rc_min_rate / fps;
|
|
const double max_rate = s->avctx->rc_max_rate / fps;
|
|
|
|
ff_dlog(s, "%d %f %d %f %f\n",
|
|
buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
|
|
|
|
if (buffer_size) {
|
|
int left;
|
|
|
|
rcc->buffer_index -= frame_size;
|
|
if (rcc->buffer_index < 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
|
|
if (frame_size > max_rate && s->qscale == s->avctx->qmax) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "max bitrate possibly too small or try trellis with large lmax or increase qmax\n");
|
|
}
|
|
rcc->buffer_index = 0;
|
|
}
|
|
|
|
left = buffer_size - rcc->buffer_index - 1;
|
|
rcc->buffer_index += av_clip(left, min_rate, max_rate);
|
|
|
|
if (rcc->buffer_index > buffer_size) {
|
|
int stuffing = ceil((rcc->buffer_index - buffer_size) / 8);
|
|
|
|
if (stuffing < 4 && s->codec_id == AV_CODEC_ID_MPEG4)
|
|
stuffing = 4;
|
|
rcc->buffer_index -= 8 * stuffing;
|
|
|
|
if (s->avctx->debug & FF_DEBUG_RC)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
|
|
|
|
return stuffing;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static double predict_size(Predictor *p, double q, double var)
|
|
{
|
|
return p->coeff * var / (q * p->count);
|
|
}
|
|
|
|
static void update_predictor(Predictor *p, double q, double var, double size)
|
|
{
|
|
double new_coeff = size * q / (var + 1);
|
|
if (var < 10)
|
|
return;
|
|
|
|
p->count *= p->decay;
|
|
p->coeff *= p->decay;
|
|
p->count++;
|
|
p->coeff += new_coeff;
|
|
}
|
|
|
|
static void adaptive_quantization(MpegEncContext *s, double q)
|
|
{
|
|
int i;
|
|
const float lumi_masking = s->avctx->lumi_masking / (128.0 * 128.0);
|
|
const float dark_masking = s->avctx->dark_masking / (128.0 * 128.0);
|
|
const float temp_cplx_masking = s->avctx->temporal_cplx_masking;
|
|
const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
|
|
const float p_masking = s->avctx->p_masking;
|
|
const float border_masking = s->border_masking;
|
|
float bits_sum = 0.0;
|
|
float cplx_sum = 0.0;
|
|
float *cplx_tab = s->cplx_tab;
|
|
float *bits_tab = s->bits_tab;
|
|
const int qmin = s->avctx->mb_lmin;
|
|
const int qmax = s->avctx->mb_lmax;
|
|
Picture *const pic = &s->current_picture;
|
|
const int mb_width = s->mb_width;
|
|
const int mb_height = s->mb_height;
|
|
|
|
for (i = 0; i < s->mb_num; i++) {
|
|
const int mb_xy = s->mb_index2xy[i];
|
|
float temp_cplx = sqrt(pic->mc_mb_var[mb_xy]); // FIXME merge in pow()
|
|
float spat_cplx = sqrt(pic->mb_var[mb_xy]);
|
|
const int lumi = pic->mb_mean[mb_xy];
|
|
float bits, cplx, factor;
|
|
int mb_x = mb_xy % s->mb_stride;
|
|
int mb_y = mb_xy / s->mb_stride;
|
|
int mb_distance;
|
|
float mb_factor = 0.0;
|
|
if (spat_cplx < 4)
|
|
spat_cplx = 4; // FIXME fine-tune
|
|
if (temp_cplx < 4)
|
|
temp_cplx = 4; // FIXME fine-tune
|
|
|
|
if ((s->mb_type[mb_xy] & CANDIDATE_MB_TYPE_INTRA)) { // FIXME hq mode
|
|
cplx = spat_cplx;
|
|
factor = 1.0 + p_masking;
|
|
} else {
|
|
cplx = temp_cplx;
|
|
factor = pow(temp_cplx, -temp_cplx_masking);
|
|
}
|
|
factor *= pow(spat_cplx, -spatial_cplx_masking);
|
|
|
|
if (lumi > 127)
|
|
factor *= (1.0 - (lumi - 128) * (lumi - 128) * lumi_masking);
|
|
else
|
|
factor *= (1.0 - (lumi - 128) * (lumi - 128) * dark_masking);
|
|
|
|
if (mb_x < mb_width / 5) {
|
|
mb_distance = mb_width / 5 - mb_x;
|
|
mb_factor = (float)mb_distance / (float)(mb_width / 5);
|
|
} else if (mb_x > 4 * mb_width / 5) {
|
|
mb_distance = mb_x - 4 * mb_width / 5;
|
|
mb_factor = (float)mb_distance / (float)(mb_width / 5);
|
|
}
|
|
if (mb_y < mb_height / 5) {
|
|
mb_distance = mb_height / 5 - mb_y;
|
|
mb_factor = FFMAX(mb_factor,
|
|
(float)mb_distance / (float)(mb_height / 5));
|
|
} else if (mb_y > 4 * mb_height / 5) {
|
|
mb_distance = mb_y - 4 * mb_height / 5;
|
|
mb_factor = FFMAX(mb_factor,
|
|
(float)mb_distance / (float)(mb_height / 5));
|
|
}
|
|
|
|
factor *= 1.0 - border_masking * mb_factor;
|
|
|
|
if (factor < 0.00001)
|
|
factor = 0.00001;
|
|
|
|
bits = cplx * factor;
|
|
cplx_sum += cplx;
|
|
bits_sum += bits;
|
|
cplx_tab[i] = cplx;
|
|
bits_tab[i] = bits;
|
|
}
|
|
|
|
/* handle qmin/qmax clipping */
|
|
if (s->mpv_flags & FF_MPV_FLAG_NAQ) {
|
|
float factor = bits_sum / cplx_sum;
|
|
for (i = 0; i < s->mb_num; i++) {
|
|
float newq = q * cplx_tab[i] / bits_tab[i];
|
|
newq *= factor;
|
|
|
|
if (newq > qmax) {
|
|
bits_sum -= bits_tab[i];
|
|
cplx_sum -= cplx_tab[i] * q / qmax;
|
|
} else if (newq < qmin) {
|
|
bits_sum -= bits_tab[i];
|
|
cplx_sum -= cplx_tab[i] * q / qmin;
|
|
}
|
|
}
|
|
if (bits_sum < 0.001)
|
|
bits_sum = 0.001;
|
|
if (cplx_sum < 0.001)
|
|
cplx_sum = 0.001;
|
|
}
|
|
|
|
for (i = 0; i < s->mb_num; i++) {
|
|
const int mb_xy = s->mb_index2xy[i];
|
|
float newq = q * cplx_tab[i] / bits_tab[i];
|
|
int intq;
|
|
|
|
if (s->mpv_flags & FF_MPV_FLAG_NAQ) {
|
|
newq *= bits_sum / cplx_sum;
|
|
}
|
|
|
|
intq = (int)(newq + 0.5);
|
|
|
|
if (intq > qmax)
|
|
intq = qmax;
|
|
else if (intq < qmin)
|
|
intq = qmin;
|
|
s->lambda_table[mb_xy] = intq;
|
|
}
|
|
}
|
|
|
|
void ff_get_2pass_fcode(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc = &s->rc_context;
|
|
RateControlEntry *rce = &rcc->entry[s->picture_number];
|
|
|
|
s->f_code = rce->f_code;
|
|
s->b_code = rce->b_code;
|
|
}
|
|
|
|
// FIXME rd or at least approx for dquant
|
|
|
|
float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
|
|
{
|
|
float q;
|
|
int qmin, qmax;
|
|
float br_compensation;
|
|
double diff;
|
|
double short_term_q;
|
|
double fps;
|
|
int picture_number = s->picture_number;
|
|
int64_t wanted_bits;
|
|
RateControlContext *rcc = &s->rc_context;
|
|
AVCodecContext *a = s->avctx;
|
|
RateControlEntry local_rce, *rce;
|
|
double bits;
|
|
double rate_factor;
|
|
int64_t var;
|
|
const int pict_type = s->pict_type;
|
|
Picture * const pic = &s->current_picture;
|
|
emms_c();
|
|
|
|
get_qminmax(&qmin, &qmax, s, pict_type);
|
|
|
|
fps = get_fps(s->avctx);
|
|
/* update predictors */
|
|
if (picture_number > 2 && !dry_run) {
|
|
const int64_t last_var =
|
|
s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum
|
|
: rcc->last_mc_mb_var_sum;
|
|
av_assert1(s->frame_bits >= s->stuffing_bits);
|
|
update_predictor(&rcc->pred[s->last_pict_type],
|
|
rcc->last_qscale,
|
|
sqrt(last_var),
|
|
s->frame_bits - s->stuffing_bits);
|
|
}
|
|
|
|
if (s->avctx->flags & AV_CODEC_FLAG_PASS2) {
|
|
av_assert0(picture_number >= 0);
|
|
if (picture_number >= rcc->num_entries) {
|
|
av_log(s, AV_LOG_ERROR, "Input is longer than 2-pass log file\n");
|
|
return -1;
|
|
}
|
|
rce = &rcc->entry[picture_number];
|
|
wanted_bits = rce->expected_bits;
|
|
} else {
|
|
Picture *dts_pic;
|
|
rce = &local_rce;
|
|
|
|
/* FIXME add a dts field to AVFrame and ensure it is set and use it
|
|
* here instead of reordering but the reordering is simpler for now
|
|
* until H.264 B-pyramid must be handled. */
|
|
if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)
|
|
dts_pic = s->current_picture_ptr;
|
|
else
|
|
dts_pic = s->last_picture_ptr;
|
|
|
|
if (!dts_pic || dts_pic->f->pts == AV_NOPTS_VALUE)
|
|
wanted_bits = (uint64_t)(s->bit_rate * (double)picture_number / fps);
|
|
else
|
|
wanted_bits = (uint64_t)(s->bit_rate * (double)dts_pic->f->pts / fps);
|
|
}
|
|
|
|
diff = s->total_bits - wanted_bits;
|
|
br_compensation = (a->bit_rate_tolerance - diff) / a->bit_rate_tolerance;
|
|
if (br_compensation <= 0.0)
|
|
br_compensation = 0.001;
|
|
|
|
var = pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum;
|
|
|
|
short_term_q = 0; /* avoid warning */
|
|
if (s->avctx->flags & AV_CODEC_FLAG_PASS2) {
|
|
if (pict_type != AV_PICTURE_TYPE_I)
|
|
av_assert0(pict_type == rce->new_pict_type);
|
|
|
|
q = rce->new_qscale / br_compensation;
|
|
ff_dlog(s, "%f %f %f last:%d var:%"PRId64" type:%d//\n", q, rce->new_qscale,
|
|
br_compensation, s->frame_bits, var, pict_type);
|
|
} else {
|
|
rce->pict_type =
|
|
rce->new_pict_type = pict_type;
|
|
rce->mc_mb_var_sum = pic->mc_mb_var_sum;
|
|
rce->mb_var_sum = pic->mb_var_sum;
|
|
rce->qscale = FF_QP2LAMBDA * 2;
|
|
rce->f_code = s->f_code;
|
|
rce->b_code = s->b_code;
|
|
rce->misc_bits = 1;
|
|
|
|
bits = predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
|
|
if (pict_type == AV_PICTURE_TYPE_I) {
|
|
rce->i_count = s->mb_num;
|
|
rce->i_tex_bits = bits;
|
|
rce->p_tex_bits = 0;
|
|
rce->mv_bits = 0;
|
|
} else {
|
|
rce->i_count = 0; // FIXME we do know this approx
|
|
rce->i_tex_bits = 0;
|
|
rce->p_tex_bits = bits * 0.9;
|
|
rce->mv_bits = bits * 0.1;
|
|
}
|
|
rcc->i_cplx_sum[pict_type] += rce->i_tex_bits * rce->qscale;
|
|
rcc->p_cplx_sum[pict_type] += rce->p_tex_bits * rce->qscale;
|
|
rcc->mv_bits_sum[pict_type] += rce->mv_bits;
|
|
rcc->frame_count[pict_type]++;
|
|
|
|
rate_factor = rcc->pass1_wanted_bits /
|
|
rcc->pass1_rc_eq_output_sum * br_compensation;
|
|
|
|
q = get_qscale(s, rce, rate_factor, picture_number);
|
|
if (q < 0)
|
|
return -1;
|
|
|
|
av_assert0(q > 0.0);
|
|
q = get_diff_limited_q(s, rce, q);
|
|
av_assert0(q > 0.0);
|
|
|
|
// FIXME type dependent blur like in 2-pass
|
|
if (pict_type == AV_PICTURE_TYPE_P || s->intra_only) {
|
|
rcc->short_term_qsum *= a->qblur;
|
|
rcc->short_term_qcount *= a->qblur;
|
|
|
|
rcc->short_term_qsum += q;
|
|
rcc->short_term_qcount++;
|
|
q = short_term_q = rcc->short_term_qsum / rcc->short_term_qcount;
|
|
}
|
|
av_assert0(q > 0.0);
|
|
|
|
q = modify_qscale(s, rce, q, picture_number);
|
|
|
|
rcc->pass1_wanted_bits += s->bit_rate / fps;
|
|
|
|
av_assert0(q > 0.0);
|
|
}
|
|
|
|
if (s->avctx->debug & FF_DEBUG_RC) {
|
|
av_log(s->avctx, AV_LOG_DEBUG,
|
|
"%c qp:%d<%2.1f<%d %d want:%"PRId64" total:%"PRId64" comp:%f st_q:%2.2f "
|
|
"size:%d var:%"PRId64"/%"PRId64" br:%"PRId64" fps:%d\n",
|
|
av_get_picture_type_char(pict_type),
|
|
qmin, q, qmax, picture_number,
|
|
wanted_bits / 1000, s->total_bits / 1000,
|
|
br_compensation, short_term_q, s->frame_bits,
|
|
pic->mb_var_sum, pic->mc_mb_var_sum,
|
|
s->bit_rate / 1000, (int)fps);
|
|
}
|
|
|
|
if (q < qmin)
|
|
q = qmin;
|
|
else if (q > qmax)
|
|
q = qmax;
|
|
|
|
if (s->adaptive_quant)
|
|
adaptive_quantization(s, q);
|
|
else
|
|
q = (int)(q + 0.5);
|
|
|
|
if (!dry_run) {
|
|
rcc->last_qscale = q;
|
|
rcc->last_mc_mb_var_sum = pic->mc_mb_var_sum;
|
|
rcc->last_mb_var_sum = pic->mb_var_sum;
|
|
}
|
|
return q;
|
|
}
|