mpegts: Convert to the new bitstream reader
[libav.git] / libavformat / oggparseflac.c
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1/*
2 * Copyright (C) 2005 Matthieu CASTET
115329f1 3 *
2912e87a 4 * This file is part of Libav.
b78e7197 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
bcfc40ae 10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
5509bffa 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
20
21#include <stdlib.h>
9106a698 22#include "libavcodec/get_bits.h"
7fa9a0a2 23#include "libavcodec/flac.h"
bcfc40ae 24#include "avformat.h"
c3f9ebf7 25#include "internal.h"
a0ddef24 26#include "oggdec.h"
bcfc40ae 27
7fa9a0a2 28#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
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29
30static int
31flac_header (AVFormatContext * s, int idx)
32{
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33 struct ogg *ogg = s->priv_data;
34 struct ogg_stream *os = ogg->streams + idx;
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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);
eedfe222 43 skip_bits1(&gb); /* metadata_last */
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44 mdt = get_bits(&gb, 7);
45
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46 if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
47 uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
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48 uint32_t samplerate;
49
eedfe222 50 skip_bits_long(&gb, 4*8); /* "FLAC" */
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51 if(get_bits(&gb, 8) != 1) /* unsupported major version */
52 return -1;
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53 skip_bits_long(&gb, 8 + 16); /* minor version + header count */
54 skip_bits_long(&gb, 4*8); /* "fLaC" */
115329f1 55
bcfc40ae 56 /* METADATA_BLOCK_HEADER */
b997b67c 57 if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
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58 return -1;
59
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60 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
61 st->codecpar->codec_id = AV_CODEC_ID_FLAC;
eed691f7 62 st->need_parsing = AVSTREAM_PARSE_HEADERS;
bcfc40ae 63
9200514a 64 st->codecpar->extradata =
059a9348 65 av_malloc(FLAC_STREAMINFO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
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66 memcpy(st->codecpar->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
67 st->codecpar->extradata_size = FLAC_STREAMINFO_SIZE;
3644cb8f 68
9200514a 69 samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
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70 if (!samplerate)
71 return AVERROR_INVALIDDATA;
72
73 avpriv_set_pts_info(st, 64, 1, samplerate);
7fa9a0a2 74 } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
db68ef89 75 ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
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76 }
77
78 return 1;
79}
80
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81static int
82old_flac_header (AVFormatContext * s, int idx)
83{
84 AVStream *st = s->streams[idx];
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85 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
86 st->codecpar->codec_id = AV_CODEC_ID_FLAC;
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87
88 return 0;
89}
90
77be08ee 91const struct ogg_codec ff_flac_codec = {
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92 .magic = "\177FLAC",
93 .magicsize = 5,
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94 .header = flac_header,
95 .nb_header = 2,
bcfc40ae 96};
880e3ef4 97
77be08ee 98const struct ogg_codec ff_old_flac_codec = {
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99 .magic = "fLaC",
100 .magicsize = 4,
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101 .header = old_flac_header,
102 .nb_header = 0,
880e3ef4 103};