mpeg.h

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00001 /* (C) Copyright 2001 by Felix Opatz <felix@zotteljedi.de>
00002  *
00003  * Copyright (c) 2003
00004  *    Felix Opatz <felix@zotteljedi.de>.  All rights reserved.
00005  *
00006  * Copyright (c) 2007
00007  *    Philip Busch <philip@0xe3.com>. All rights reserved.
00008  *
00009  * Redistribution and use in source and binary forms, with or without
00010  * modification, are permitted provided that the following conditions
00011  * are met:
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, this list of conditions and the following disclaimer as
00014  *    the first lines of this file unmodified.
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in the
00017  *    documentation and/or other materials provided with the distribution.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00020  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00021  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00022  * IN NO EVENT SHALL FELIX OPATZ BE LIABLE FOR ANY DIRECT, INDIRECT,
00023  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00024  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00025  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00026  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00027  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00028  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029  */
00030 
00031 #ifndef _MPEG_H
00032 #define _MPEG_H
00033 
00034 
00035 #define MPEG_VERSION_1          3
00036 #define MPEG_VERSION_2          2
00037 #define MPEG_VERSION_2_5        0
00038 
00039 #define LAYER_VERSION_1         3
00040 #define LAYER_VERSION_2         2
00041 #define LAYER_VERSION_3         1
00042 
00043 #define CMODE_STEREO            0
00044 #define CMODE_JOINT_STEREO      1
00045 #define CMODE_DUAL_CHANNEL      2
00046 #define CMODE_SINGLE_CHANNEL    3
00047 
00048 /* number of samples per frame */
00049 #define FRAME_SIZE_LAYER_1      384
00050 #define FRAME_SIZE_LAYER_2      1152
00051 #define FRAME_SIZE_LAYER_3      1152
00052 
00053 #define MASK_SYNC       0xFFE00000
00054 #define SHIFT_SYNC      21
00055 
00056 #define MASK_MPEG       0x180000
00057 #define SHIFT_MPEG      19
00058 
00059 #define MASK_LAYER      0x60000
00060 #define SHIFT_LAYER     17
00061 
00062 #define MASK_PROT       0x10000
00063 #define SHIFT_PROT      16
00064 
00065 #define MASK_BITRATE    0xF000
00066 #define SHIFT_BITRATE   12
00067 
00068 #define MASK_FREQ       0xC00
00069 #define SHIFT_FREQ      10
00070 
00071 #define MASK_PADDING    0x200
00072 #define SHIFT_PADDING   9
00073 
00074 #define MASK_PRIV       0x100
00075 #define SHIFT_PRIV      8
00076 
00077 #define MASK_CHAN       0xC0
00078 #define SHIFT_CHAN      6
00079 
00080 #define MASK_MODE_EXT   0x30
00081 #define SHIFT_MODE_EXT  4
00082 
00083 #define MASK_COPYRIGHT  0x8
00084 #define SHIFT_COPYRIGHT 3
00085 
00086 #define MASK_ORIG       0x4
00087 #define SHIFT_ORIG      2
00088 
00089 #define MASK_EMPHASIS   0x3
00090 #define SHIFT_EMPHASIS  0
00091 
00092 struct mpeg {
00093         int             mpeg_version;
00094         int             layer_desc;
00095         int             bitrate;
00096         int             freq;
00097         int             chan;
00098         int             mode_ext;
00099         int             emphasis;
00100         int             bit_padding;
00101         int             bit_priv;
00102         int             bit_copyright;
00103         int             bit_orig;
00104         int             bit_prot;
00105 };
00106 
00107 int mpeg_read(const char *_path, struct mpeg *_mpeg);
00108 unsigned long int mpeg_seek_next_header(FILE *_fp);
00109 int mpeg_extract_info(unsigned long int _header, struct mpeg *_mpeg);
00110 size_t mpeg_frame_length(struct mpeg *_mpeg);
00111 size_t mpeg_frame_bytes(struct mpeg *_mpeg);
00112 void mpeg_print(struct mpeg *_mpeg);
00113 
00114 #endif  /* ! _MPEG_H */

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