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/*
* Raw FLAC demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
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#include "libavcodec/flac.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "rawdec.h" |
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#include "oggdec.h" |
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#include "vorbiscomment.h" |
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#include "libavcodec/bytestream.h" |
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static int flac_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{ |
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int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
uint8_t header[4];
uint8_t *buffer=NULL; |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st)
return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = CODEC_ID_FLAC;
st->need_parsing = AVSTREAM_PARSE_FULL;
/* the parameters will be extracted from the compressed bitstream */
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/* if fLaC marker is not found, assume there is no header */ |
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if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) { |
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avio_seek(s->pb, -4, SEEK_CUR); |
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return 0; |
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} |
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/* process metadata blocks */
while (!url_feof(s->pb) && !metadata_last) { |
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avio_read(s->pb, header, 4); |
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avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type, |
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&metadata_size);
switch (metadata_type) {
/* allocate and read metadata block for supported types */
case FLAC_METADATA_TYPE_STREAMINFO: |
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case FLAC_METADATA_TYPE_CUESHEET: |
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case FLAC_METADATA_TYPE_VORBIS_COMMENT:
buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!buffer) { |
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return AVERROR(ENOMEM); |
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} |
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if (avio_read(s->pb, buffer, metadata_size) != metadata_size) { |
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av_freep(&buffer); |
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return AVERROR(EIO); |
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}
break;
/* skip metadata block for unsupported types */
default: |
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ret = avio_skip(s->pb, metadata_size); |
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if (ret < 0)
return ret;
}
if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
FLACStreaminfo si;
/* STREAMINFO can only occur once */
if (found_streaminfo) {
av_freep(&buffer);
return AVERROR_INVALIDDATA;
}
if (metadata_size != FLAC_STREAMINFO_SIZE) {
av_freep(&buffer);
return AVERROR_INVALIDDATA;
}
found_streaminfo = 1;
st->codec->extradata = buffer;
st->codec->extradata_size = metadata_size;
buffer = NULL;
/* get codec params from STREAMINFO header */ |
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avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata); |
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/* set time base and duration */
if (si.samplerate > 0) { |
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avpriv_set_pts_info(st, 64, 1, si.samplerate); |
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if (si.samples > 0)
st->duration = si.samples;
} |
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} else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
uint8_t isrc[13];
uint64_t start;
const uint8_t *offset; |
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int i, chapters, track, ti; |
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if (metadata_size < 431)
return AVERROR_INVALIDDATA;
offset = buffer + 395;
chapters = bytestream_get_byte(&offset) - 1;
if (chapters <= 0)
return AVERROR_INVALIDDATA;
for (i = 0; i < chapters; i++) {
if (offset + 36 - buffer > metadata_size)
return AVERROR_INVALIDDATA;
start = bytestream_get_be64(&offset);
track = bytestream_get_byte(&offset);
bytestream_get_buffer(&offset, isrc, 12);
isrc[12] = 0;
offset += 14;
ti = bytestream_get_byte(&offset);
if (ti <= 0) return AVERROR_INVALIDDATA; |
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offset += ti * 12; |
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avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
} |
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} else {
/* STREAMINFO must be the first block */
if (!found_streaminfo) {
av_freep(&buffer);
return AVERROR_INVALIDDATA;
}
/* process supported blocks other than STREAMINFO */
if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) { |
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if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) { |
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av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
}
}
av_freep(&buffer);
}
}
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return 0;
}
static int flac_probe(AVProbeData *p)
{ |
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if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
return 0;
return AVPROBE_SCORE_MAX/2; |
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}
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AVInputFormat ff_flac_demuxer = { |
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.name = "flac",
.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
.read_probe = flac_probe,
.read_header = flac_read_header,
.read_packet = ff_raw_read_partial_packet, |
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.flags= AVFMT_GENERIC_INDEX,
.extensions = "flac",
.value = CODEC_ID_FLAC,
}; |