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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/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; | |
2ba45a60 DM |
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; | |
f6fa7814 DM |
48 | uint32_t samplerate; |
49 | ||
2ba45a60 DM |
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 | ||
2ba45a60 DM |
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 | 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); | |
67 | ||
f6fa7814 DM |
68 | samplerate = AV_RB24(st->codec->extradata + 10) >> 4; |
69 | if (!samplerate) | |
70 | return AVERROR_INVALIDDATA; | |
71 | ||
72 | avpriv_set_pts_info(st, 64, 1, samplerate); | |
2ba45a60 DM |
73 | } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) { |
74 | ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4); | |
75 | } | |
76 | ||
77 | return 1; | |
78 | } | |
79 | ||
80 | static int | |
81 | old_flac_header (AVFormatContext * s, int idx) | |
82 | { | |
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); | |
87 | int size; | |
88 | uint8_t *data; | |
89 | ||
90 | if (!parser) | |
91 | return -1; | |
92 | ||
93 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
94 | st->codec->codec_id = AV_CODEC_ID_FLAC; | |
95 | ||
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); | |
100 | ||
101 | av_parser_close(parser); | |
102 | ||
103 | if (st->codec->sample_rate) { | |
104 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | return 1; | |
109 | } | |
110 | ||
111 | const struct ogg_codec ff_flac_codec = { | |
112 | .magic = "\177FLAC", | |
113 | .magicsize = 5, | |
114 | .header = flac_header, | |
115 | .nb_header = 2, | |
116 | }; | |
117 | ||
118 | const struct ogg_codec ff_old_flac_codec = { | |
119 | .magic = "fLaC", | |
120 | .magicsize = 4, | |
121 | .header = old_flac_header, | |
122 | .nb_header = 0, | |
123 | }; |