3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
22 #include "libavcodec/flac.h"
27 #include "vorbiscomment.h"
28 #include "libavcodec/bytestream.h"
30 static int flac_read_header(AVFormatContext *s)
32 int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
35 AVStream *st = avformat_new_stream(s, NULL);
37 return AVERROR(ENOMEM);
38 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
39 st->codec->codec_id = CODEC_ID_FLAC;
40 st->need_parsing = AVSTREAM_PARSE_FULL;
41 /* the parameters will be extracted from the compressed bitstream */
43 /* if fLaC marker is not found, assume there is no header */
44 if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
45 avio_seek(s->pb, -4, SEEK_CUR);
49 /* process metadata blocks */
50 while (!s->pb->eof_reached && !metadata_last) {
51 avio_read(s->pb, header, 4);
52 avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
54 switch (metadata_type) {
55 /* allocate and read metadata block for supported types */
56 case FLAC_METADATA_TYPE_STREAMINFO:
57 case FLAC_METADATA_TYPE_CUESHEET:
58 case FLAC_METADATA_TYPE_VORBIS_COMMENT:
59 buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
61 return AVERROR(ENOMEM);
63 if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
68 /* skip metadata block for unsupported types */
70 ret = avio_skip(s->pb, metadata_size);
75 if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
77 /* STREAMINFO can only occur once */
78 if (found_streaminfo) {
80 return AVERROR_INVALIDDATA;
82 if (metadata_size != FLAC_STREAMINFO_SIZE) {
84 return AVERROR_INVALIDDATA;
87 st->codec->extradata = buffer;
88 st->codec->extradata_size = metadata_size;
91 /* get codec params from STREAMINFO header */
92 avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
94 /* set time base and duration */
95 if (si.samplerate > 0) {
96 avpriv_set_pts_info(st, 64, 1, si.samplerate);
98 st->duration = si.samples;
100 } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
103 const uint8_t *offset;
104 int i, chapters, track, ti;
105 if (metadata_size < 431)
106 return AVERROR_INVALIDDATA;
107 offset = buffer + 395;
108 chapters = bytestream_get_byte(&offset) - 1;
110 return AVERROR_INVALIDDATA;
111 for (i = 0; i < chapters; i++) {
112 if (offset + 36 - buffer > metadata_size)
113 return AVERROR_INVALIDDATA;
114 start = bytestream_get_be64(&offset);
115 track = bytestream_get_byte(&offset);
116 bytestream_get_buffer(&offset, isrc, 12);
119 ti = bytestream_get_byte(&offset);
120 if (ti <= 0) return AVERROR_INVALIDDATA;
122 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
125 /* STREAMINFO must be the first block */
126 if (!found_streaminfo) {
128 return AVERROR_INVALIDDATA;
130 /* process supported blocks other than STREAMINFO */
131 if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
132 if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
133 av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
143 static int flac_probe(AVProbeData *p)
145 uint8_t *bufptr = p->buf;
146 uint8_t *end = p->buf + p->buf_size;
148 if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;
149 else return AVPROBE_SCORE_MAX/2;
152 AVInputFormat ff_flac_demuxer = {
154 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
155 .read_probe = flac_probe,
156 .read_header = flac_read_header,
157 .read_packet = ff_raw_read_partial_packet,
158 .flags = AVFMT_GENERIC_INDEX,
159 .extensions = "flac",
160 .raw_codec_id = CODEC_ID_FLAC,