137 lines
4.6 KiB
C
137 lines
4.6 KiB
C
/*
|
|
* Raw FLAC demuxer
|
|
* Copyright (c) 2001 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavcodec/flac.h"
|
|
#include "avformat.h"
|
|
#include "rawdec.h"
|
|
#include "oggdec.h"
|
|
#include "vorbiscomment.h"
|
|
|
|
static int flac_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
|
|
uint8_t header[4];
|
|
uint8_t *buffer=NULL;
|
|
AVStream *st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_FLAC;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
/* the parameters will be extracted from the compressed bitstream */
|
|
|
|
/* if fLaC marker is not found, assume there is no header */
|
|
if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
|
|
avio_seek(s->pb, -4, SEEK_CUR);
|
|
return 0;
|
|
}
|
|
|
|
/* process metadata blocks */
|
|
while (!s->pb->eof_reached && !metadata_last) {
|
|
avio_read(s->pb, header, 4);
|
|
ff_flac_parse_block_header(header, &metadata_last, &metadata_type,
|
|
&metadata_size);
|
|
switch (metadata_type) {
|
|
/* allocate and read metadata block for supported types */
|
|
case FLAC_METADATA_TYPE_STREAMINFO:
|
|
case FLAC_METADATA_TYPE_VORBIS_COMMENT:
|
|
buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!buffer) {
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
|
|
av_freep(&buffer);
|
|
return AVERROR(EIO);
|
|
}
|
|
break;
|
|
/* skip metadata block for unsupported types */
|
|
default:
|
|
ret = avio_skip(s->pb, metadata_size);
|
|
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 */
|
|
ff_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
|
|
|
|
/* set time base and duration */
|
|
if (si.samplerate > 0) {
|
|
av_set_pts_info(st, 64, 1, si.samplerate);
|
|
if (si.samples > 0)
|
|
st->duration = si.samples;
|
|
}
|
|
} 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) {
|
|
if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
|
|
av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
|
|
}
|
|
}
|
|
av_freep(&buffer);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flac_probe(AVProbeData *p)
|
|
{
|
|
uint8_t *bufptr = p->buf;
|
|
uint8_t *end = p->buf + p->buf_size;
|
|
|
|
if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;
|
|
else return AVPROBE_SCORE_MAX/2;
|
|
}
|
|
|
|
AVInputFormat ff_flac_demuxer = {
|
|
"flac",
|
|
NULL_IF_CONFIG_SMALL("raw FLAC"),
|
|
0,
|
|
flac_probe,
|
|
flac_read_header,
|
|
ff_raw_read_partial_packet,
|
|
.flags= AVFMT_GENERIC_INDEX,
|
|
.extensions = "flac",
|
|
.value = CODEC_ID_FLAC,
|
|
};
|