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
  28  * ratecontrol header.
  29  */
  30
  31 #include <stdint.h>
  32
  33 typedef struct Predictor{
  34     double coeff;
  35     double count;
  36     double decay;
  37 } Predictor;
  38
  39 typedef struct RateControlEntry{
  40     int pict_type;
  41     float qscale;
  42     int i_count;
  43     int f_code;
  44     int b_code;
  45     int mv_bits;
  46     int i_tex_bits;
  47     int p_tex_bits;
  48     int misc_bits;
  49     int header_bits;
  50     uint64_t expected_bits;
  51     int new_pict_type;
  52     float new_qscale;
  53     int64_t mc_mb_var_sum;
  54     int64_t mb_var_sum;
  55 }RateControlEntry;
  56
  57 /**
  58  * rate control context.
  59  */
  60 typedef struct RateControlContext{
  61     int num_entries;              ///< number of RateControlEntries
  62     RateControlEntry *entry;
  63     double buffer_index;          ///< amount of bits in the video/audio buffer
  64     Predictor pred[5];
  65     double short_term_qsum;       ///< sum of recent qscales
  66     double short_term_qcount;     ///< count of recent qscales
  67     double pass1_rc_eq_output_sum;///< sum of the output of the rc equation, this is used for normalization
  68     double pass1_wanted_bits;     ///< bits which should have been output by the pass1 code (including complexity init)
  69     double last_qscale;
  70     double last_qscale_for[5];    ///< last qscale for a specific pict type, used for max_diff & ipb factor stuff
  71     int64_t last_mc_mb_var_sum;
  72     int64_t last_mb_var_sum;
  73     uint64_t i_cplx_sum[5];
  74     uint64_t p_cplx_sum[5];
  75     uint64_t mv_bits_sum[5];
  76     uint64_t qscale_sum[5];
  77     int frame_count[5];
  78     int last_non_b_pict_type;
  79
  80     struct AVExpr *rc_eq_eval;
  81 }RateControlContext;
  82
  83 struct MpegEncContext;
  84
  85 /* rate control */
  86 int ff_rate_control_init(struct MpegEncContext *s);
  87 float ff_rate_estimate_qscale(struct MpegEncContext *s, int dry_run);
  88 void ff_write_pass1_stats(struct MpegEncContext *s);
  89 int ff_vbv_update(struct MpegEncContext *s, int frame_size);
  90 void ff_get_2pass_fcode(struct MpegEncContext *s);
  91 void ff_rate_control_uninit(RateControlContext *rcc);
  92
  93 #endif /* AVCODEC_RATECONTROL_H */