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 (!avio_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 ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
143 av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
144 } else if (ret > 0) {
145 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
148 /* parse the channels mask if present */
149 chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
151 uint64_t mask = strtol(chmask->value, NULL, 0);
152 if (!mask || mask & ~0x3ffffULL) {
153 av_log(s, AV_LOG_WARNING,
154 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
156 st->codec->channel_layout = mask;
157 av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
165 ret = ff_replaygain_export(st, s->metadata);
176 static int flac_probe(AVProbeData *p)
178 if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
180 return AVPROBE_SCORE_EXTENSION;
183 static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
184 int64_t *ppos, int64_t pos_limit)
186 AVPacket pkt, out_pkt;
187 AVStream *st = s->streams[stream_index];
188 AVCodecParserContext *parser;
190 int64_t pts = AV_NOPTS_VALUE;
192 if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
193 return AV_NOPTS_VALUE;
195 av_init_packet(&pkt);
196 parser = av_parser_init(st->codec->codec_id);
198 return AV_NOPTS_VALUE;
200 parser->flags |= PARSER_FLAG_USE_CODEC_TS;
203 ret = ff_raw_read_partial_packet(s, &pkt);
205 if (ret == AVERROR(EAGAIN))
210 av_init_packet(&out_pkt);
211 ret = av_parser_parse2(parser, st->codec,
212 &out_pkt.data, &out_pkt.size, pkt.data, pkt.size,
213 pkt.pts, pkt.dts, *ppos);
215 av_free_packet(&pkt);
217 int size = out_pkt.size;
218 if (parser->pts != AV_NOPTS_VALUE){
219 // seeking may not have started from beginning of a frame
220 // calculate frame start position from next frame backwards
221 *ppos = parser->next_frame_offset - size;
227 av_parser_close(parser);
231 AVInputFormat ff_flac_demuxer = {
233 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
234 .read_probe = flac_probe,
235 .read_header = flac_read_header,
236 .read_packet = ff_raw_read_partial_packet,
237 .read_timestamp = flac_read_timestamp,
238 .flags = AVFMT_GENERIC_INDEX,
239 .extensions = "flac",
240 .raw_codec_id = AV_CODEC_ID_FLAC,