1/*
2 *    Copyright (C) 2005  Matthieu CASTET
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include <stdlib.h>
22#include "libavcodec/bitstream.h"
23#include "libavcodec/flac.h"
24#include "avformat.h"
25#include "oggdec.h"
26
27#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
28
29static int
30flac_header (AVFormatContext * s, int idx)
31{
32    struct ogg *ogg = s->priv_data;
33    struct ogg_stream *os = ogg->streams + idx;
34    AVStream *st = s->streams[idx];
35    GetBitContext gb;
36    FLACStreaminfo si;
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        skip_bits_long(&gb, 4*8); /* "FLAC" */
49        if(get_bits(&gb, 8) != 1) /* unsupported major version */
50            return -1;
51        skip_bits_long(&gb, 8 + 16); /* minor version + header count */
52        skip_bits_long(&gb, 4*8); /* "fLaC" */
53
54        /* METADATA_BLOCK_HEADER */
55        if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
56            return -1;
57
58        ff_flac_parse_streaminfo(st->codec, &si, streaminfo_start);
59
60        st->codec->codec_type = CODEC_TYPE_AUDIO;
61        st->codec->codec_id = CODEC_ID_FLAC;
62
63        st->codec->extradata =
64            av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
65        memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
66        st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
67
68        st->time_base.num = 1;
69        st->time_base.den = st->codec->sample_rate;
70    } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
71        vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
72    }
73
74    return 1;
75}
76
77static int
78old_flac_header (AVFormatContext * s, int idx)
79{
80    AVStream *st = s->streams[idx];
81    st->codec->codec_type = CODEC_TYPE_AUDIO;
82    st->codec->codec_id = CODEC_ID_FLAC;
83
84    return 0;
85}
86
87const struct ogg_codec ff_flac_codec = {
88    .magic = "\177FLAC",
89    .magicsize = 5,
90    .header = flac_header
91};
92
93const struct ogg_codec ff_old_flac_codec = {
94    .magic = "fLaC",
95    .magicsize = 4,
96    .header = old_flac_header
97};
98