ratecontrol.h

法国人的264代码 大家看看啊,里面有很多可以借鉴的东西啊

/*****************************************************************************
 * ratecontrol.h: h264 encoder library (Rate Control)
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: ratecontrol.h,v 1.1 2004/06/03 19:27:08 fenrir Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#ifndef _RATECONTROL_H
#define _RATECONTROL_H 1
#include "stdio.h"


typedef struct
{
    int pict_type;
    int kept_as_ref;
    float qscale;
    int mv_bits;
    int i_tex_bits;
    int p_tex_bits;
    int misc_bits;
    uint64_t expected_bits;
    float new_qscale;
    int new_qp;
    int i_count;
    int p_count;
    int s_count;
    float blurred_complexity;
    char direct_mode;
} ratecontrol_entry_t;

typedef struct
{
    double coeff;
    double count;
    double decay;
} predictor_t;

typedef struct 
{
    /* constants */
    int b_abr;
    int b_2pass;
    int b_vbv;
    double fps;
    double bitrate;
    double rate_tolerance;
    int nmb;                    /* number of macroblocks in a frame */
    int qp_constant[5];

    /* current frame */
    ratecontrol_entry_t *rce;
    int qp;                     /* qp for current frame */
    int qpm;                    /* qp for current macroblock */
    float qpa;                  /* average of macroblocks' qp */
    int slice_type;
    int qp_force;

    /* VBV stuff */
    double buffer_size;
    double buffer_fill;
    double buffer_rate;         /* # of bits added to buffer_fill after each frame */
    predictor_t pred[5];        /* predict frame size from satd */

    /* ABR stuff */
    int    last_satd;
    double last_rceq;
    double cplxr_sum;           /* sum of bits*qscale/rceq */
    double expected_bits_sum;   /* sum of qscale2bits after rceq, ratefactor, and overflow */
    double wanted_bits_window;  /* target bitrate * window */
    double cbr_decay;
    double short_term_cplxsum;
    double short_term_cplxcount;
    double rate_factor_constant;
    double ip_offset;
    double pb_offset;

    /* 2pass stuff */
    FILE *p_stat_file_out;
    char *psz_stat_file_tmpname;

    int num_entries;            /* number of ratecontrol_entry_ts */
    ratecontrol_entry_t *entry; /* FIXME: copy needed data and free this once init is done */
    double last_qscale;
    double last_qscale_for[5];  /* last qscale for a specific pict type, used for max_diff & ipb factor stuff  */
    int last_non_b_pict_type;
    double accum_p_qp;          /* for determining I-frame quant */
    double accum_p_norm;
    double last_accum_p_norm;
    double lmin[5];             /* min qscale by frame type */
    double lmax[5];
    double lstep;               /* max change (multiply) in qscale per frame */
    double i_cplx_sum[5];       /* estimated total texture bits in intra MBs at qscale=1 */
    double p_cplx_sum[5];
    double mv_bits_sum[5];
    int frame_count[5];         /* number of frames of each type */

    /* MBRC stuff */
    double frame_size_planned;
    int first_row, last_row;    /* region of the frame to be encoded by this thread */
    predictor_t *row_pred;
    predictor_t row_preds[5];
    predictor_t pred_b_from_p;  /* predict B-frame size from P-frame satd */
    int bframes;                /* # consecutive B-frames before this P-frame */
    int bframe_bits;            /* total cost of those frames */

    int i_zones;
    x264_zone_t *zones;
}x264_ratecontrol_t;

int  x264_ratecontrol_new   ( x264_t * );
void x264_ratecontrol_delete( x264_t * );

void x264_ratecontrol_start( x264_t *, int i_slice_type, int i_force_qp );
void x264_ratecontrol_threads_start( x264_t * );
int  x264_ratecontrol_slice_type( x264_t *, int i_frame );
void x264_ratecontrol_mb( x264_t *, int bits );
int  x264_ratecontrol_qp( x264_t * );
void x264_ratecontrol_end( x264_t *, int bits );
void x264_ratecontrol_summary( x264_t * );

#endif