2 * libmad - MPEG audio decoder library
3 * Copyright (C) 2000-2001 Robert Leslie
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.
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.
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
23 # include "madconfig.h"
34 * NAME: stream->init()
35 * DESCRIPTION: initialize stream struct
37 void mad_stream_init(struct mad_stream
*stream
)
46 stream
->this_frame
= 0;
47 stream
->next_frame
= 0;
48 mad_bit_init(&stream
->ptr
, 0);
50 mad_bit_init(&stream
->anc_ptr
, 0);
51 stream
->anc_bitlen
= 0;
53 stream
->main_data
= 0;
57 stream
->error
= MAD_ERROR_NONE
;
61 * NAME: stream->finish()
62 * DESCRIPTION: deallocate any dynamic memory associated with stream
64 void mad_stream_finish(struct mad_stream
*stream
)
66 if (stream
->main_data
) {
67 free(stream
->main_data
);
68 stream
->main_data
= 0;
71 mad_bit_finish(&stream
->anc_ptr
);
72 mad_bit_finish(&stream
->ptr
);
76 * NAME: stream->buffer()
77 * DESCRIPTION: set stream buffer pointers
79 void mad_stream_buffer(struct mad_stream
*stream
,
80 unsigned char const *buffer
, unsigned long length
)
82 stream
->buffer
= buffer
;
83 stream
->bufend
= buffer
+ length
;
85 stream
->this_frame
= buffer
;
86 stream
->next_frame
= buffer
;
90 mad_bit_init(&stream
->ptr
, buffer
);
94 * NAME: stream->skip()
95 * DESCRIPTION: arrange to skip bytes before the next frame
97 void mad_stream_skip(struct mad_stream
*stream
, unsigned long length
)
99 stream
->skiplen
+= length
;
103 * NAME: stream->sync()
104 * DESCRIPTION: locate the next stream sync word
106 int mad_stream_sync(struct mad_stream
*stream
)
108 register unsigned char const *ptr
, *end
;
110 ptr
= mad_bit_nextbyte(&stream
->ptr
);
111 end
= stream
->bufend
;
113 while (ptr
< end
- 1 &&
114 !(ptr
[0] == 0xff && (ptr
[1] & 0xe0) == 0xe0))
117 if (end
- ptr
< MAD_BUFFER_GUARD
)
120 mad_bit_init(&stream
->ptr
, ptr
);
126 * NAME: stream->errorstr()
127 * DESCRIPTION: return a string description of the current error condition
129 char const *mad_stream_errorstr(struct mad_stream
const *stream
)
131 switch (stream
->error
) {
132 case MAD_ERROR_NONE
: return "no error";
134 case MAD_ERROR_BUFLEN
: return "input buffer too small (or EOF)";
135 case MAD_ERROR_BUFPTR
: return "invalid (null) buffer pointer";
137 case MAD_ERROR_NOMEM
: return "not enough memory";
139 case MAD_ERROR_LOSTSYNC
: return "lost synchronization";
140 case MAD_ERROR_BADLAYER
: return "reserved header layer value";
141 case MAD_ERROR_BADBITRATE
: return "forbidden bitrate value";
142 case MAD_ERROR_BADSAMPLERATE
: return "reserved sample frequency value";
143 case MAD_ERROR_BADEMPHASIS
: return "reserved emphasis value";
145 case MAD_ERROR_BADCRC
: return "CRC check failed";
146 case MAD_ERROR_BADBITALLOC
: return "forbidden bit allocation value";
147 case MAD_ERROR_BADSCALEFACTOR
: return "bad scalefactor index";
148 case MAD_ERROR_BADFRAMELEN
: return "bad frame length";
149 case MAD_ERROR_BADBIGVALUES
: return "bad big_values count";
150 case MAD_ERROR_BADBLOCKTYPE
: return "reserved block_type";
151 case MAD_ERROR_BADSCFSI
: return "bad scalefactor selection info";
152 case MAD_ERROR_BADDATAPTR
: return "bad main_data_begin pointer";
153 case MAD_ERROR_BADPART3LEN
: return "bad audio data length";
154 case MAD_ERROR_BADHUFFTABLE
: return "bad Huffman table select";
155 case MAD_ERROR_BADHUFFDATA
: return "Huffman data overrun";
156 case MAD_ERROR_BADSTEREO
: return "incompatible block_type for JS";