| 1 |
291 |
simons |
/*
|
| 2 |
|
|
* mad - MPEG audio decoder
|
| 3 |
|
|
* Copyright (C) 2000-2001 Robert Leslie
|
| 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 |
|
|
*
|
| 19 |
|
|
* $Id: stream.h,v 1.3 2001-11-06 17:01:28 simons Exp $
|
| 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_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
|
| 32 |
|
|
MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
|
| 33 |
|
|
|
| 34 |
|
|
MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
|
| 35 |
|
|
|
| 36 |
|
|
MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
|
| 37 |
|
|
MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
|
| 38 |
|
|
MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
|
| 39 |
|
|
MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
|
| 40 |
|
|
MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
|
| 41 |
|
|
|
| 42 |
|
|
MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
|
| 43 |
|
|
MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
|
| 44 |
|
|
MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
|
| 45 |
|
|
MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
|
| 46 |
|
|
MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
|
| 47 |
|
|
MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
|
| 48 |
|
|
MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
|
| 49 |
|
|
MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
|
| 50 |
|
|
MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
|
| 51 |
|
|
MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
|
| 52 |
|
|
MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
|
| 53 |
|
|
MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
|
| 54 |
|
|
};
|
| 55 |
|
|
|
| 56 |
|
|
# define MAD_RECOVERABLE(error) ((error) & 0xff00)
|
| 57 |
|
|
|
| 58 |
|
|
struct mad_stream {
|
| 59 |
|
|
unsigned char const *buffer; /* input bitstream buffer */
|
| 60 |
|
|
unsigned char const *bufend; /* end of buffer */
|
| 61 |
|
|
unsigned long skiplen; /* bytes to skip before next frame */
|
| 62 |
|
|
|
| 63 |
|
|
int sync; /* stream sync found */
|
| 64 |
|
|
unsigned long freerate; /* free bitrate (fixed) */
|
| 65 |
|
|
|
| 66 |
|
|
unsigned char const *this_frame; /* start of current frame */
|
| 67 |
|
|
unsigned char const *next_frame; /* start of next frame */
|
| 68 |
|
|
struct mad_bitptr ptr; /* current processing bit pointer */
|
| 69 |
|
|
|
| 70 |
|
|
struct mad_bitptr anc_ptr; /* ancillary bits pointer */
|
| 71 |
|
|
unsigned int anc_bitlen; /* number of ancillary bits */
|
| 72 |
|
|
|
| 73 |
|
|
unsigned char (*main_data);
|
| 74 |
|
|
/* Layer III main_data() */
|
| 75 |
|
|
unsigned int md_len; /* bytes in main_data */
|
| 76 |
|
|
|
| 77 |
|
|
int options; /* decoding options (see below) */
|
| 78 |
|
|
enum mad_error error; /* error code (see above) */
|
| 79 |
|
|
};
|
| 80 |
|
|
|
| 81 |
|
|
enum {
|
| 82 |
|
|
MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
|
| 83 |
|
|
MAD_OPTION_HALFSAMPLERATE = 0x0002, /* generate PCM at 1/2 sample rate */
|
| 84 |
|
|
# if 0 /* not yet implemented */
|
| 85 |
|
|
MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
|
| 86 |
|
|
MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
|
| 87 |
|
|
MAD_OPTION_SINGLECHANNEL = 0x0030, /* combine channels */
|
| 88 |
|
|
# endif
|
| 89 |
|
|
};
|
| 90 |
|
|
|
| 91 |
|
|
void mad_stream_init(struct mad_stream *);
|
| 92 |
|
|
void mad_stream_finish(struct mad_stream *);
|
| 93 |
|
|
|
| 94 |
|
|
# define mad_stream_options(stream, opts) ((stream)->options = (opts))
|
| 95 |
|
|
|
| 96 |
|
|
void mad_stream_buffer(struct mad_stream *,
|
| 97 |
|
|
unsigned char const *, unsigned long);
|
| 98 |
|
|
void mad_stream_skip(struct mad_stream *, unsigned long);
|
| 99 |
|
|
|
| 100 |
|
|
int mad_stream_sync(struct mad_stream *);
|
| 101 |
|
|
|
| 102 |
|
|
# endif
|
