57bba68079991fbeb476a3344f6549cf8c482e98
[libav.git] / libavformat / oggparseflac.c
1 /*
2 * Copyright (C) 2005 Matthieu CASTET
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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.
10 *
11 * Libav 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.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdlib.h>
22 #include "libavcodec/get_bits.h"
23 #include "libavcodec/flac.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "oggdec.h"
27
28 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
29
30 static int
31 flac_header (AVFormatContext * s, int idx)
32 {
33 struct ogg *ogg = s->priv_data;
34 struct ogg_stream *os = ogg->streams + idx;
35 AVStream *st = s->streams[idx];
36 GetBitContext gb;
37 int mdt;
38
39 if (os->buf[os->pstart] == 0xff)
40 return 0;
41
42 init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
43 skip_bits1(&gb); /* metadata_last */
44 mdt = get_bits(&gb, 7);
45
46 if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
47 uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
48 uint32_t samplerate;
49
50 skip_bits_long(&gb, 4*8); /* "FLAC" */
51 if(get_bits(&gb, 8) != 1) /* unsupported major version */
52 return -1;
53 skip_bits_long(&gb, 8 + 16); /* minor version + header count */
54 skip_bits_long(&gb, 4*8); /* "fLaC" */
55
56 /* METADATA_BLOCK_HEADER */
57 if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
58 return -1;
59
60 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
61 st->codec->codec_id = AV_CODEC_ID_FLAC;
62 st->need_parsing = AVSTREAM_PARSE_HEADERS;
63
64 st->codec->extradata =
65 av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
66 memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
67 st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
68
69 samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
70 if (!samplerate)
71 return AVERROR_INVALIDDATA;
72
73 avpriv_set_pts_info(st, 64, 1, samplerate);
74 } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
75 ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
76 }
77
78 return 1;
79 }
80
81 static int
82 old_flac_header (AVFormatContext * s, int idx)
83 {
84 AVStream *st = s->streams[idx];
85 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
86 st->codec->codec_id = AV_CODEC_ID_FLAC;
87
88 return 0;
89 }
90
91 const struct ogg_codec ff_flac_codec = {
92 .magic = "\177FLAC",
93 .magicsize = 5,
94 .header = flac_header,
95 .nb_header = 2,
96 };
97
98 const struct ogg_codec ff_old_flac_codec = {
99 .magic = "fLaC",
100 .magicsize = 4,
101 .header = old_flac_header,
102 .nb_header = 0,
103 };