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
flac_header(AVFormatContext * s,int idx)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, ret;
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(&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 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
63
64 if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
65 return ret;
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
old_flac_header(AVFormatContext * s,int idx)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