PeerStreamer

/*

 * 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 FFMPEG_RATECONTROL_H

#define FFMPEG_RATECONTROL_H

/**

 * @file ratecontrol.h

 * ratecontrol header.

 */

#include <stdio.h>

#include <stdint.h>

#include "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;

    int mc_mb_var_sum;

    int mb_var_sum;

    int i_count;

    int skip_count;

    int f_code;

    int b_code;

}RateControlEntry;

/**

 * rate control context.

 */

typedef struct RateControlContext{

    FILE *stats_file;

    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 outputed 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

    int last_mc_mb_var_sum;

    int 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

    AVEvalExpr * 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);

int ff_xvid_rate_control_init(struct MpegEncContext *s);

void ff_xvid_rate_control_uninit(struct MpegEncContext *s);

float ff_xvid_rate_estimate_qscale(struct MpegEncContext *s, int dry_run);

#endif /* FFMPEG_RATECONTROL_H */