blob: b5f1416a3c59582e540a0d2175bad3655e19a2ed
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; |
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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
61 | st->codecpar->codec_id = AV_CODEC_ID_FLAC; |
62 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
63 | |
64 | if (ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE) < 0) |
65 | return AVERROR(ENOMEM); |
66 | memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size); |
67 | |
68 | samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4; |
69 | if (!samplerate) |
70 | return AVERROR_INVALIDDATA; |
71 | |
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); |
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 | AVCodecContext *avctx; |
88 | int size, ret; |
89 | uint8_t *data; |
90 | |
91 | if (!parser) |
92 | return -1; |
93 | |
94 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
95 | st->codecpar->codec_id = AV_CODEC_ID_FLAC; |
96 | |
97 | avctx = avcodec_alloc_context3(NULL); |
98 | if (!avctx) { |
99 | ret = AVERROR(ENOMEM); |
100 | goto fail; |
101 | } |
102 | |
103 | ret = avcodec_parameters_to_context(avctx, st->codecpar); |
104 | if (ret < 0) |
105 | goto fail; |
106 | |
107 | parser->flags = PARSER_FLAG_COMPLETE_FRAMES; |
108 | av_parser_parse2(parser, avctx, |
109 | &data, &size, os->buf + os->pstart, os->psize, |
110 | AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1); |
111 | |
112 | av_parser_close(parser); |
113 | |
114 | if (avctx->sample_rate) { |
115 | avpriv_set_pts_info(st, 64, 1, avctx->sample_rate); |
116 | avcodec_free_context(&avctx); |
117 | return 0; |
118 | } |
119 | |
120 | avcodec_free_context(&avctx); |
121 | return 1; |
122 | fail: |
123 | av_parser_close(parser); |
124 | avcodec_free_context(&avctx); |
125 | return ret; |
126 | } |
127 | |
128 | const struct ogg_codec ff_flac_codec = { |
129 | .magic = "\177FLAC", |
130 | .magicsize = 5, |
131 | .header = flac_header, |
132 | .nb_header = 2, |
133 | }; |
134 | |
135 | const struct ogg_codec ff_old_flac_codec = { |
136 | .magic = "fLaC", |
137 | .magicsize = 4, |
138 | .header = old_flac_header, |
139 | .nb_header = 0, |
140 | }; |
141 |