ffmpeg/libavcodec/adpcm.h

   1 /*
   2  * Copyright (c) 2001-2003 The FFmpeg Project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * ADPCM encoder/decoder common header.
  24  */
  25
  26 #ifndef AVCODEC_ADPCM_H
  27 #define AVCODEC_ADPCM_H
  28
  29 #include <stdint.h>
  30
  31 #define BLKSIZE 1024
  32
  33 typedef struct ADPCMChannelStatus {
  34     int predictor;
  35     int16_t step_index;
  36     int step;
  37     /* for encoding */
  38     int prev_sample;
  39
  40     /* MS version */
  41     int sample1;
  42     int sample2;
  43     int coeff1;
  44     int coeff2;
  45     int idelta;
  46 } ADPCMChannelStatus;
  47
  48 #endif /* AVCODEC_ADPCM_H */