3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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,
31 AVFormatParameters *ap)
33 int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
36 AVStream *st = avformat_new_stream(s, NULL);
38 return AVERROR(ENOMEM);
39 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
40 st->codec->codec_id = CODEC_ID_FLAC;
41 st->need_parsing = AVSTREAM_PARSE_FULL;
42 /* the parameters will be extracted from the compressed bitstream */
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);
50 /* process metadata blocks */
51 while (!url_feof(s->pb) && !metadata_last) {
52 avio_read(s->pb, header, 4);
53 avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
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_VORBIS_COMMENT:
60 buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
62 return AVERROR(ENOMEM);
64 if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
69 /* skip metadata block for unsupported types */
71 ret = avio_skip(s->pb, metadata_size);
76 if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
78 /* STREAMINFO can only occur once */
79 if (found_streaminfo) {
81 return AVERROR_INVALIDDATA;
83 if (metadata_size != FLAC_STREAMINFO_SIZE) {
85 return AVERROR_INVALIDDATA;
88 st->codec->extradata = buffer;
89 st->codec->extradata_size = metadata_size;
92 /* get codec params from STREAMINFO header */
93 avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
95 /* set time base and duration */
96 if (si.samplerate > 0) {
97 avpriv_set_pts_info(st, 64, 1, si.samplerate);
99 st->duration = si.samples;
101 } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
104 const uint8_t *offset;
105 int i, chapters, track, ti;
106 if (metadata_size < 431)
107 return AVERROR_INVALIDDATA;
108 offset = buffer + 395;
109 chapters = bytestream_get_byte(&offset) - 1;
111 return AVERROR_INVALIDDATA;
112 for (i = 0; i < chapters; i++) {
113 if (offset + 36 - buffer > metadata_size)
114 return AVERROR_INVALIDDATA;
115 start = bytestream_get_be64(&offset);
116 track = bytestream_get_byte(&offset);
117 bytestream_get_buffer(&offset, isrc, 12);
120 ti = bytestream_get_byte(&offset);
121 if (ti <= 0) return AVERROR_INVALIDDATA;
123 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
126 /* STREAMINFO must be the first block */
127 if (!found_streaminfo) {
129 return AVERROR_INVALIDDATA;
131 /* process supported blocks other than STREAMINFO */
132 if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
133 if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
134 av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
144 static int flac_probe(AVProbeData *p)
146 uint8_t *bufptr = p->buf;
147 uint8_t *end = p->buf + p->buf_size;
149 if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;
150 else return AVPROBE_SCORE_MAX/2;
153 AVInputFormat ff_flac_demuxer = {
155 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
156 .read_probe = flac_probe,
157 .read_header = flac_read_header,
158 .read_packet = ff_raw_read_partial_packet,
159 .flags= AVFMT_GENERIC_INDEX,
160 .extensions = "flac",
161 .value = CODEC_ID_FLAC,