2 * Copyright (C) 2005 Matthieu CASTET
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavcodec/get_bits.h"
23 #include "libavcodec/flac.h"
28 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
31 flac_header (AVFormatContext
* s
, int idx
)
33 struct ogg
*ogg
= s
->priv_data
;
34 struct ogg_stream
*os
= ogg
->streams
+ idx
;
35 AVStream
*st
= s
->streams
[idx
];
39 if (os
->buf
[os
->pstart
] == 0xff)
42 init_get_bits(&gb
, os
->buf
+ os
->pstart
, os
->psize
*8);
43 skip_bits1(&gb
); /* metadata_last */
44 mdt
= get_bits(&gb
, 7);
46 if (mdt
== OGG_FLAC_METADATA_TYPE_STREAMINFO
) {
47 uint8_t *streaminfo_start
= os
->buf
+ os
->pstart
+ 5 + 4 + 4 + 4;
50 skip_bits_long(&gb
, 4*8); /* "FLAC" */
51 if(get_bits(&gb
, 8) != 1) /* unsupported major version */
53 skip_bits_long(&gb
, 8 + 16); /* minor version + header count */
54 skip_bits_long(&gb
, 4*8); /* "fLaC" */
56 /* METADATA_BLOCK_HEADER */
57 if (get_bits_long(&gb
, 32) != FLAC_STREAMINFO_SIZE
)
60 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
61 st
->codec
->codec_id
= AV_CODEC_ID_FLAC
;
62 st
->need_parsing
= AVSTREAM_PARSE_HEADERS
;
64 if (ff_alloc_extradata(st
->codec
, FLAC_STREAMINFO_SIZE
) < 0)
65 return AVERROR(ENOMEM
);
66 memcpy(st
->codec
->extradata
, streaminfo_start
, st
->codec
->extradata_size
);
68 samplerate
= AV_RB24(st
->codec
->extradata
+ 10) >> 4;
70 return AVERROR_INVALIDDATA
;
72 avpriv_set_pts_info(st
, 64, 1, samplerate
);
73 } else if (mdt
== FLAC_METADATA_TYPE_VORBIS_COMMENT
) {
74 ff_vorbis_stream_comment(s
, st
, os
->buf
+ os
->pstart
+ 4, os
->psize
- 4);
81 old_flac_header (AVFormatContext
* s
, int idx
)
83 struct ogg
*ogg
= s
->priv_data
;
84 AVStream
*st
= s
->streams
[idx
];
85 struct ogg_stream
*os
= ogg
->streams
+ idx
;
86 AVCodecParserContext
*parser
= av_parser_init(AV_CODEC_ID_FLAC
);
93 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
94 st
->codec
->codec_id
= AV_CODEC_ID_FLAC
;
96 parser
->flags
= PARSER_FLAG_COMPLETE_FRAMES
;
97 av_parser_parse2(parser
, st
->codec
,
98 &data
, &size
, os
->buf
+ os
->pstart
, os
->psize
,
99 AV_NOPTS_VALUE
, AV_NOPTS_VALUE
, -1);
101 av_parser_close(parser
);
103 if (st
->codec
->sample_rate
) {
104 avpriv_set_pts_info(st
, 64, 1, st
->codec
->sample_rate
);
111 const struct ogg_codec ff_flac_codec
= {
114 .header
= flac_header
,
118 const struct ogg_codec ff_old_flac_codec
= {
121 .header
= old_flac_header
,