apps/codecs/libm4a/m4a.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #ifndef _M4A_H
  23 #define _M4A_H
  24
  25 #include <codecs.h>
  26 #include <inttypes.h>
  27
  28 /* AAC codecdata appears to always be less than 8 bytes - see
  29    AudioSpecificConfig2 in libfaad/mp4.c
  30
  31    ALAC codecdata appears to always be 44 bytes (see alac_set_info in
  32    libalac/alac.c) but my test file contains 56 bytes.
  33
  34    So we go safe and round up to 64 bytes - if we find more than this,
  35    we give an error (even though we could possibly continue), so we
  36    can increase this buffer.
  37 */
  38
  39 #define MAX_CODECDATA_SIZE  64
  40
  41 typedef struct {
  42   struct codec_api* ci;
  43   int eof;
  44 } stream_t;
  45
  46 typedef uint32_t fourcc_t;
  47
  48 typedef struct
  49 {
  50     uint16_t num_channels;
  51     uint16_t sound_sample_size;
  52     uint32_t sound_sample_rate;
  53     fourcc_t format;
  54     void *buf;
  55
  56     struct {
  57         uint32_t first_chunk;
  58         uint32_t num_samples;
  59     } *sample_to_chunk;
  60     uint32_t num_sample_to_chunks;
  61
  62     uint32_t *chunk_offset;
  63     uint32_t num_chunk_offsets;
  64
  65     struct {
  66         uint32_t sample_count;
  67         uint32_t sample_duration;
  68     } *time_to_sample;
  69     uint32_t num_time_to_samples;
  70
  71     uint16_t *sample_byte_size;
  72     uint32_t num_sample_byte_sizes;
  73
  74     uint32_t codecdata_len;
  75     uint8_t codecdata[MAX_CODECDATA_SIZE];
  76
  77     int mdat_offset;
  78     uint32_t mdat_len;
  79 #if 0
  80     void *mdat;
  81 #endif
  82 } demux_res_t;
  83
  84 int qtmovie_read(stream_t *stream, demux_res_t *demux_res);
  85
  86 #ifndef MAKEFOURCC
  87 #define MAKEFOURCC(ch0, ch1, ch2, ch3) ( \
  88     ( (int32_t)(char)(ch0) << 24 ) | \
  89     ( (int32_t)(char)(ch1) << 16 ) | \
  90     ( (int32_t)(char)(ch2) << 8 ) | \
  91     ( (int32_t)(char)(ch3) ) )
  92 #endif
  93
  94 #ifndef SLPITFOURCC
  95 /* splits it into ch0, ch1, ch2, ch3 - use for printf's */
  96 #define SPLITFOURCC(code) \
  97     (char)((int32_t)code >> 24), \
  98     (char)((int32_t)code >> 16), \
  99     (char)((int32_t)code >> 8), \
 100     (char)code
 101 #endif
 102
 103 void stream_read(stream_t *stream, size_t len, void *buf);
 104
 105 int32_t stream_tell(stream_t *stream);
 106 int32_t stream_read_int32(stream_t *stream);
 107 uint32_t stream_read_uint32(stream_t *stream);
 108
 109 int16_t stream_read_int16(stream_t *stream);
 110 uint16_t stream_read_uint16(stream_t *stream);
 111
 112 int8_t stream_read_int8(stream_t *stream);
 113 uint8_t stream_read_uint8(stream_t *stream);
 114
 115 void stream_skip(stream_t *stream, size_t skip);
 116
 117 int stream_eof(stream_t *stream);
 118
 119 void stream_create(stream_t *stream,struct codec_api* ci);
 120 int get_sample_info(demux_res_t *demux_res, uint32_t sample,
 121     uint32_t *sample_duration, uint32_t *sample_byte_size);
 122 unsigned int get_sample_offset(demux_res_t *demux_res, uint32_t sample);
 123 unsigned int alac_seek (demux_res_t* demux_res, stream_t* stream,
 124     uint32_t sound_sample_loc, uint32_t* sound_samples_done,
 125     int* current_sample);
 126 unsigned int alac_seek_raw (demux_res_t* demux_res, stream_t* stream,
 127     uint32_t file_loc, uint32_t* sound_samples_done, int* current_sample);
 128
 129 #endif /* STREAM_H */