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14 roytam 1 /*
2  * libmad - MPEG audio decoder library
26 roytam 3  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
14 roytam 4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18  *
26 roytam 19  * $Id: frame.h,v 1.20 2004/01/23 09:41:32 rob Exp $
14 roytam 20  */
21  
22 # ifndef LIBMAD_FRAME_H
23 # define LIBMAD_FRAME_H
24  
25 # include "fixed.h"
26 # include "timer.h"
27 # include "stream.h"
28  
29 enum mad_layer {
30   MAD_LAYER_I   = 1,                    /* Layer I */
31   MAD_LAYER_II  = 2,                    /* Layer II */
32   MAD_LAYER_III = 3                     /* Layer III */
33 };
34  
35 enum mad_mode {
36   MAD_MODE_SINGLE_CHANNEL = 0,          /* single channel */
37   MAD_MODE_DUAL_CHANNEL   = 1,          /* dual channel */
38   MAD_MODE_JOINT_STEREO   = 2,          /* joint (MS/intensity) stereo */
39   MAD_MODE_STEREO         = 3           /* normal LR stereo */
40 };
41  
42 enum mad_emphasis {
43   MAD_EMPHASIS_NONE       = 0,          /* no emphasis */
44   MAD_EMPHASIS_50_15_US   = 1,          /* 50/15 microseconds emphasis */
45   MAD_EMPHASIS_CCITT_J_17 = 3,          /* CCITT J.17 emphasis */
46   MAD_EMPHASIS_RESERVED   = 2           /* unknown emphasis */
47 };
48  
49 struct mad_header {
50   enum mad_layer layer;                 /* audio layer (1, 2, or 3) */
51   enum mad_mode mode;                   /* channel mode (see above) */
52   int mode_extension;                   /* additional mode info */
53   enum mad_emphasis emphasis;           /* de-emphasis to use (see above) */
54  
55   unsigned long bitrate;                /* stream bitrate (bps) */
56   unsigned int samplerate;              /* sampling frequency (Hz) */
57  
58   unsigned short crc_check;             /* frame CRC accumulator */
59   unsigned short crc_target;            /* final target CRC checksum */
60  
61   int flags;                            /* flags (see below) */
62   int private_bits;                     /* private bits (see below) */
63  
64   mad_timer_t duration;                 /* audio playing time of frame */
65 };
66  
67 struct mad_frame {
68   struct mad_header header;             /* MPEG audio header */
69  
70   int options;                          /* decoding options (from stream) */
71  
72   mad_fixed_t sbsample[2][36][32];      /* synthesis subband filter samples */
73   mad_fixed_t (*overlap)[2][32][18];    /* Layer III block overlap data */
74 };
75  
76 # define MAD_NCHANNELS(header)          ((header)->mode ? 2 : 1)
77 # define MAD_NSBSAMPLES(header)  \
78   ((header)->layer == MAD_LAYER_I ? 12 :  \
79    (((header)->layer == MAD_LAYER_III &&  \
80      ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
81  
82 enum {
83   MAD_FLAG_NPRIVATE_III = 0x0007,       /* number of Layer III private bits */
84   MAD_FLAG_INCOMPLETE   = 0x0008,       /* header but not data is decoded */
85  
86   MAD_FLAG_PROTECTION   = 0x0010,       /* frame has CRC protection */
87   MAD_FLAG_COPYRIGHT    = 0x0020,       /* frame is copyright */
88   MAD_FLAG_ORIGINAL     = 0x0040,       /* frame is original (else copy) */
89   MAD_FLAG_PADDING      = 0x0080,       /* frame has additional slot */
90  
91   MAD_FLAG_I_STEREO     = 0x0100,       /* uses intensity joint stereo */
92   MAD_FLAG_MS_STEREO    = 0x0200,       /* uses middle/side joint stereo */
93   MAD_FLAG_FREEFORMAT   = 0x0400,       /* uses free format bitrate */
94  
95   MAD_FLAG_LSF_EXT      = 0x1000,       /* lower sampling freq. extension */
96   MAD_FLAG_MC_EXT       = 0x2000,       /* multichannel audio extension */
97   MAD_FLAG_MPEG_2_5_EXT = 0x4000        /* MPEG 2.5 (unofficial) extension */
98 };
99  
100 enum {
101   MAD_PRIVATE_HEADER    = 0x0100,       /* header private bit */
102   MAD_PRIVATE_III       = 0x001f        /* Layer III private bits (up to 5) */
103 };
104  
105 void mad_header_init(struct mad_header *);
106  
107 # define mad_header_finish(header)  /* nothing */
108  
109 int mad_header_decode(struct mad_header *, struct mad_stream *);
110  
111 void mad_frame_init(struct mad_frame *);
112 void mad_frame_finish(struct mad_frame *);
113  
114 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
115  
116 void mad_frame_mute(struct mad_frame *);
117  
118 # endif