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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: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp $
14 roytam 20  */
21  
22 # ifndef LIBMAD_STREAM_H
23 # define LIBMAD_STREAM_H
24  
25 # include "bit.h"
26  
27 # define MAD_BUFFER_GUARD       8
28 # define MAD_BUFFER_MDLEN       (511 + 2048 + MAD_BUFFER_GUARD)
29  
30 enum mad_error {
31   MAD_ERROR_NONE           = 0x0000,    /* no error */
32  
33   MAD_ERROR_BUFLEN         = 0x0001,    /* input buffer too small (or EOF) */
34   MAD_ERROR_BUFPTR         = 0x0002,    /* invalid (null) buffer pointer */
35  
36   MAD_ERROR_NOMEM          = 0x0031,    /* not enough memory */
37  
38   MAD_ERROR_LOSTSYNC       = 0x0101,    /* lost synchronization */
39   MAD_ERROR_BADLAYER       = 0x0102,    /* reserved header layer value */
40   MAD_ERROR_BADBITRATE     = 0x0103,    /* forbidden bitrate value */
41   MAD_ERROR_BADSAMPLERATE  = 0x0104,    /* reserved sample frequency value */
42   MAD_ERROR_BADEMPHASIS    = 0x0105,    /* reserved emphasis value */
43  
44   MAD_ERROR_BADCRC         = 0x0201,    /* CRC check failed */
45   MAD_ERROR_BADBITALLOC    = 0x0211,    /* forbidden bit allocation value */
46   MAD_ERROR_BADSCALEFACTOR = 0x0221,    /* bad scalefactor index */
26 roytam 47   MAD_ERROR_BADMODE        = 0x0222,    /* bad bitrate/mode combination */
14 roytam 48   MAD_ERROR_BADFRAMELEN    = 0x0231,    /* bad frame length */
49   MAD_ERROR_BADBIGVALUES   = 0x0232,    /* bad big_values count */
50   MAD_ERROR_BADBLOCKTYPE   = 0x0233,    /* reserved block_type */
51   MAD_ERROR_BADSCFSI       = 0x0234,    /* bad scalefactor selection info */
52   MAD_ERROR_BADDATAPTR     = 0x0235,    /* bad main_data_begin pointer */
53   MAD_ERROR_BADPART3LEN    = 0x0236,    /* bad audio data length */
54   MAD_ERROR_BADHUFFTABLE   = 0x0237,    /* bad Huffman table select */
55   MAD_ERROR_BADHUFFDATA    = 0x0238,    /* Huffman data overrun */
56   MAD_ERROR_BADSTEREO      = 0x0239     /* incompatible block_type for JS */
57 };
58  
59 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
60  
61 struct mad_stream {
62   unsigned char const *buffer;          /* input bitstream buffer */
63   unsigned char const *bufend;          /* end of buffer */
64   unsigned long skiplen;                /* bytes to skip before next frame */
65  
66   int sync;                             /* stream sync found */
67   unsigned long freerate;               /* free bitrate (fixed) */
68  
69   unsigned char const *this_frame;      /* start of current frame */
70   unsigned char const *next_frame;      /* start of next frame */
71   struct mad_bitptr ptr;                /* current processing bit pointer */
72  
73   struct mad_bitptr anc_ptr;            /* ancillary bits pointer */
74   unsigned int anc_bitlen;              /* number of ancillary bits */
75  
76   unsigned char (*main_data)[MAD_BUFFER_MDLEN];
77                                         /* Layer III main_data() */
78   unsigned int md_len;                  /* bytes in main_data */
79  
80   int options;                          /* decoding options (see below) */
81   enum mad_error error;                 /* error code (see above) */
82 };
83  
84 enum {
85   MAD_OPTION_IGNORECRC      = 0x0001,   /* ignore CRC errors */
86   MAD_OPTION_HALFSAMPLERATE = 0x0002    /* generate PCM at 1/2 sample rate */
87 # if 0  /* not yet implemented */
88   MAD_OPTION_LEFTCHANNEL    = 0x0010,   /* decode left channel only */
89   MAD_OPTION_RIGHTCHANNEL   = 0x0020,   /* decode right channel only */
90   MAD_OPTION_SINGLECHANNEL  = 0x0030    /* combine channels */
91 # endif
92 };
93  
94 void mad_stream_init(struct mad_stream *);
95 void mad_stream_finish(struct mad_stream *);
96  
97 # define mad_stream_options(stream, opts)  \
98     ((void) ((stream)->options = (opts)))
99  
100 void mad_stream_buffer(struct mad_stream *,
101                        unsigned char const *, unsigned long);
102 void mad_stream_skip(struct mad_stream *, unsigned long);
103  
104 int mad_stream_sync(struct mad_stream *);
105  
106 char const *mad_stream_errorstr(struct mad_stream const *);
107  
108 # endif