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"
24 #include "flac_picture.h"
28 #include "vorbiscomment.h"
29 #include "replaygain.h"
30 #include "libavcodec/bytestream.h"
32 static int flac_read_header(AVFormatContext *s)
34 int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
37 AVStream *st = avformat_new_stream(s, NULL);
39 return AVERROR(ENOMEM);
40 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
41 st->codec->codec_id = AV_CODEC_ID_FLAC;
42 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
43 /* the parameters will be extracted from the compressed bitstream */
45 /* if fLaC marker is not found, assume there is no header */
46 if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
47 avio_seek(s->pb, -4, SEEK_CUR);
51 /* process metadata blocks */
52 while (!url_feof(s->pb) && !metadata_last) {
53 avio_read(s->pb, header, 4);
54 flac_parse_block_header(header, &metadata_last, &metadata_type,
56 switch (metadata_type) {
57 /* allocate and read metadata block for supported types */
58 case FLAC_METADATA_TYPE_STREAMINFO:
59 case FLAC_METADATA_TYPE_CUESHEET:
60 case FLAC_METADATA_TYPE_PICTURE:
61 case FLAC_METADATA_TYPE_VORBIS_COMMENT:
62 buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
64 return AVERROR(ENOMEM);
66 if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
67 RETURN_ERROR(AVERROR(EIO));
70 /* skip metadata block for unsupported types */
72 ret = avio_skip(s->pb, metadata_size);
77 if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
79 /* STREAMINFO can only occur once */
80 if (found_streaminfo) {
81 RETURN_ERROR(AVERROR_INVALIDDATA);
83 if (metadata_size != FLAC_STREAMINFO_SIZE) {
84 RETURN_ERROR(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_ERROR(AVERROR_INVALIDDATA);
107 offset = buffer + 395;
108 chapters = bytestream_get_byte(&offset) - 1;
110 RETURN_ERROR(AVERROR_INVALIDDATA);
111 for (i = 0; i < chapters; i++) {
112 if (offset + 36 - buffer > metadata_size)
113 RETURN_ERROR(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_ERROR(AVERROR_INVALIDDATA);
122 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
125 } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
126 ret = ff_flac_parse_picture(s, buffer, metadata_size);
129 av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
133 /* STREAMINFO must be the first block */
134 if (!found_streaminfo) {
135 RETURN_ERROR(AVERROR_INVALIDDATA);
137 /* process supported blocks other than STREAMINFO */
138 if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
139 AVDictionaryEntry *chmask;
141 if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1)) {
142 av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
145 /* parse the channels mask if present */
146 chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
148 uint64_t mask = strtol(chmask->value, NULL, 0);
149 if (!mask || mask & ~0x3ffffULL) {
150 av_log(s, AV_LOG_WARNING,
151 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
153 st->codec->channel_layout = mask;
154 av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
162 ret = ff_replaygain_export(st, s->metadata);
173 static int flac_probe(AVProbeData *p)
175 if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
177 return AVPROBE_SCORE_EXTENSION;
180 static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
181 int64_t *ppos, int64_t pos_limit)
183 AVPacket pkt, out_pkt;
184 AVStream *st = s->streams[stream_index];
185 AVCodecParserContext *parser;
187 int64_t pts = AV_NOPTS_VALUE;
189 if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
190 return AV_NOPTS_VALUE;
192 av_init_packet(&pkt);
193 parser = av_parser_init(st->codec->codec_id);
195 return AV_NOPTS_VALUE;
197 parser->flags |= PARSER_FLAG_USE_CODEC_TS;
200 ret = ff_raw_read_partial_packet(s, &pkt);
202 if (ret == AVERROR(EAGAIN))
207 av_init_packet(&out_pkt);
208 ret = av_parser_parse2(parser, st->codec,
209 &out_pkt.data, &out_pkt.size, pkt.data, pkt.size,
210 pkt.pts, pkt.dts, *ppos);
212 av_free_packet(&pkt);
214 int size = out_pkt.size;
215 if (parser->pts != AV_NOPTS_VALUE){
216 // seeking may not have started from beginning of a frame
217 // calculate frame start position from next frame backwards
218 *ppos = parser->next_frame_offset - size;
224 av_parser_close(parser);
228 AVInputFormat ff_flac_demuxer = {
230 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
231 .read_probe = flac_probe,
232 .read_header = flac_read_header,
233 .read_packet = ff_raw_read_partial_packet,
234 .read_timestamp = flac_read_timestamp,
235 .flags = AVFMT_GENERIC_INDEX,
236 .extensions = "flac",
237 .raw_codec_id = AV_CODEC_ID_FLAC,