ecbb7ec0ef917e555c18a64c8cbea1ace415f655
[libav.git] / libavformat / flacdec.c
1 /*
2 * Raw FLAC demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavcodec/flac.h"
23 #include "avformat.h"
24 #include "flac_picture.h"
25 #include "internal.h"
26 #include "rawdec.h"
27 #include "oggdec.h"
28 #include "vorbiscomment.h"
29 #include "libavcodec/bytestream.h"
30
31 static int flac_read_header(AVFormatContext *s)
32 {
33 int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
34 uint8_t header[4];
35 uint8_t *buffer=NULL;
36 AVStream *st = avformat_new_stream(s, NULL);
37 if (!st)
38 return AVERROR(ENOMEM);
39 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
40 st->codec->codec_id = AV_CODEC_ID_FLAC;
41 st->need_parsing = AVSTREAM_PARSE_FULL;
42 /* the parameters will be extracted from the compressed bitstream */
43
44 /* if fLaC marker is not found, assume there is no header */
45 if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
46 avio_seek(s->pb, -4, SEEK_CUR);
47 return 0;
48 }
49
50 /* process metadata blocks */
51 while (!s->pb->eof_reached && !metadata_last) {
52 avio_read(s->pb, header, 4);
53 avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
54 &metadata_size);
55 switch (metadata_type) {
56 /* allocate and read metadata block for supported types */
57 case FLAC_METADATA_TYPE_STREAMINFO:
58 case FLAC_METADATA_TYPE_CUESHEET:
59 case FLAC_METADATA_TYPE_PICTURE:
60 case FLAC_METADATA_TYPE_VORBIS_COMMENT:
61 buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
62 if (!buffer) {
63 return AVERROR(ENOMEM);
64 }
65 if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
66 av_freep(&buffer);
67 return AVERROR(EIO);
68 }
69 break;
70 /* skip metadata block for unsupported types */
71 default:
72 ret = avio_skip(s->pb, metadata_size);
73 if (ret < 0)
74 return ret;
75 }
76
77 if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
78 FLACStreaminfo si;
79 /* STREAMINFO can only occur once */
80 if (found_streaminfo) {
81 av_freep(&buffer);
82 return AVERROR_INVALIDDATA;
83 }
84 if (metadata_size != FLAC_STREAMINFO_SIZE) {
85 av_freep(&buffer);
86 return AVERROR_INVALIDDATA;
87 }
88 found_streaminfo = 1;
89 st->codec->extradata = buffer;
90 st->codec->extradata_size = metadata_size;
91 buffer = NULL;
92
93 /* get codec params from STREAMINFO header */
94 avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
95
96 /* set time base and duration */
97 if (si.samplerate > 0) {
98 avpriv_set_pts_info(st, 64, 1, si.samplerate);
99 if (si.samples > 0)
100 st->duration = si.samples;
101 }
102 } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
103 uint8_t isrc[13];
104 uint64_t start;
105 const uint8_t *offset;
106 int i, chapters, track, ti;
107 if (metadata_size < 431)
108 return AVERROR_INVALIDDATA;
109 offset = buffer + 395;
110 chapters = bytestream_get_byte(&offset) - 1;
111 if (chapters <= 0)
112 return AVERROR_INVALIDDATA;
113 for (i = 0; i < chapters; i++) {
114 if (offset + 36 - buffer > metadata_size)
115 return AVERROR_INVALIDDATA;
116 start = bytestream_get_be64(&offset);
117 track = bytestream_get_byte(&offset);
118 bytestream_get_buffer(&offset, isrc, 12);
119 isrc[12] = 0;
120 offset += 14;
121 ti = bytestream_get_byte(&offset);
122 if (ti <= 0) return AVERROR_INVALIDDATA;
123 offset += ti * 12;
124 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
125 }
126 } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
127 ret = ff_flac_parse_picture(s, buffer, metadata_size);
128 av_freep(&buffer);
129 if (ret < 0) {
130 av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
131 return ret;
132 }
133 } else {
134 /* STREAMINFO must be the first block */
135 if (!found_streaminfo) {
136 av_freep(&buffer);
137 return AVERROR_INVALIDDATA;
138 }
139 /* process supported blocks other than STREAMINFO */
140 if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
141 if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
142 av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
143 }
144 }
145 av_freep(&buffer);
146 }
147 }
148
149 return 0;
150 }
151
152 static int flac_probe(AVProbeData *p)
153 {
154 if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
155 return 0;
156 return AVPROBE_SCORE_EXTENSION;
157 }
158
159 AVInputFormat ff_flac_demuxer = {
160 .name = "flac",
161 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
162 .read_probe = flac_probe,
163 .read_header = flac_read_header,
164 .read_packet = ff_raw_read_partial_packet,
165 .flags = AVFMT_GENERIC_INDEX,
166 .extensions = "flac",
167 .raw_codec_id = AV_CODEC_ID_FLAC,
168 };