aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Ratecontrol
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_RATECONTROL_H
#define AVCODEC_RATECONTROL_H
/**
* @file
* ratecontrol header.
*/
#include <stdio.h>
#include <stdint.h>
#include "libavutil/eval.h"
typedef struct Predictor{
double coeff;
double count;
double decay;
} Predictor;
typedef struct RateControlEntry{
int pict_type;
float qscale;
int mv_bits;
int i_tex_bits;
int p_tex_bits;
int misc_bits;
int header_bits;
uint64_t expected_bits;
int new_pict_type;
float new_qscale;
int64_t mc_mb_var_sum;
int64_t mb_var_sum;
int i_count;
int skip_count;
int f_code;
int b_code;
}RateControlEntry;
/**
* rate control context.
*/
typedef struct RateControlContext{
int num_entries; ///< number of RateControlEntries
RateControlEntry *entry;
double buffer_index; ///< amount of bits in the video/audio buffer
Predictor pred[5];
double short_term_qsum; ///< sum of recent qscales
double short_term_qcount; ///< count of recent qscales
double pass1_rc_eq_output_sum;///< sum of the output of the rc equation, this is used for normalization
double pass1_wanted_bits; ///< bits which should have been output by the pass1 code (including complexity init)
double last_qscale;
double last_qscale_for[5]; ///< last qscale for a specific pict type, used for max_diff & ipb factor stuff
int64_t last_mc_mb_var_sum;
int64_t last_mb_var_sum;
uint64_t i_cplx_sum[5];
uint64_t p_cplx_sum[5];
uint64_t mv_bits_sum[5];
uint64_t qscale_sum[5];
int frame_count[5];
int last_non_b_pict_type;
void *non_lavc_opaque; ///< context for non lavc rc code (for example xvid)
float dry_run_qscale; ///< for xvid rc
int last_picture_number; ///< for xvid rc
AVExpr * rc_eq_eval;
}RateControlContext;
struct MpegEncContext;
/* rate control */
int ff_rate_control_init(struct MpegEncContext *s);
float ff_rate_estimate_qscale(struct MpegEncContext *s, int dry_run);
void ff_write_pass1_stats(struct MpegEncContext *s);
void ff_rate_control_uninit(struct MpegEncContext *s);
int ff_vbv_update(struct MpegEncContext *s, int frame_size);
void ff_get_2pass_fcode(struct MpegEncContext *s);
#endif /* AVCODEC_RATECONTROL_H */
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