libavcodec/ratecontrol.h

   1 /*
   2  * Ratecontrol
   3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
   4  * Copyright (c) 2002-2004 Michael Niedermayer
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef AVCODEC_RATECONTROL_H
  24 #define AVCODEC_RATECONTROL_H
  25
  26 /**
  27  * @file ratecontrol.h
  28  * ratecontrol header.
  29  */
  30
  31 #include <stdio.h>
  32 #include <stdint.h>
  33 #include "eval.h"
  34
  35 typedef struct Predictor{
  36     double coeff;
  37     double count;
  38     double decay;
  39 } Predictor;
  40
  41 typedef struct RateControlEntry{
  42     int pict_type;
  43     float qscale;
  44     int mv_bits;
  45     int i_tex_bits;
  46     int p_tex_bits;
  47     int misc_bits;
  48     int header_bits;
  49     uint64_t expected_bits;
  50     int new_pict_type;
  51     float new_qscale;
  52     int mc_mb_var_sum;
  53     int mb_var_sum;
  54     int i_count;
  55     int skip_count;
  56     int f_code;
  57     int b_code;
  58 }RateControlEntry;
  59
  60 /**
  61  * rate control context.
  62  */
  63 typedef struct RateControlContext{
  64     FILE *stats_file;
  65     int num_entries;              ///< number of RateControlEntries
  66     RateControlEntry *entry;
  67     double buffer_index;          ///< amount of bits in the video/audio buffer
  68     Predictor pred[5];
  69     double short_term_qsum;       ///< sum of recent qscales
  70     double short_term_qcount;     ///< count of recent qscales
  71     double pass1_rc_eq_output_sum;///< sum of the output of the rc equation, this is used for normalization
  72     double pass1_wanted_bits;     ///< bits which should have been outputed by the pass1 code (including complexity init)
  73     double last_qscale;
  74     double last_qscale_for[5];    ///< last qscale for a specific pict type, used for max_diff & ipb factor stuff
  75     int last_mc_mb_var_sum;
  76     int last_mb_var_sum;
  77     uint64_t i_cplx_sum[5];
  78     uint64_t p_cplx_sum[5];
  79     uint64_t mv_bits_sum[5];
  80     uint64_t qscale_sum[5];
  81     int frame_count[5];
  82     int last_non_b_pict_type;
  83
  84     void *non_lavc_opaque;        ///< context for non lavc rc code (for example xvid)
  85     float dry_run_qscale;         ///< for xvid rc
  86     int last_picture_number;      ///< for xvid rc
  87     AVEvalExpr * rc_eq_eval;
  88 }RateControlContext;
  89
  90 struct MpegEncContext;
  91
  92 /* rate control */
  93 int ff_rate_control_init(struct MpegEncContext *s);
  94 float ff_rate_estimate_qscale(struct MpegEncContext *s, int dry_run);
  95 void ff_write_pass1_stats(struct MpegEncContext *s);
  96 void ff_rate_control_uninit(struct MpegEncContext *s);
  97 int ff_vbv_update(struct MpegEncContext *s, int frame_size);
  98 void ff_get_2pass_fcode(struct MpegEncContext *s);
  99
 100 int ff_xvid_rate_control_init(struct MpegEncContext *s);
 101 void ff_xvid_rate_control_uninit(struct MpegEncContext *s);
 102 float ff_xvid_rate_estimate_qscale(struct MpegEncContext *s, int dry_run);
 103
 104 #endif /* AVCODEC_RATECONTROL_H */
 105