mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2005 Matthieu CASTET
|
|
*
|
|
* 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 <stdlib.h>
|
|
|
|
#include "libavcodec/bitstream.h"
|
|
#include "libavcodec/flac.h"
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "oggdec.h"
|
|
|
|
#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
|
|
|
|
static int
|
|
flac_header (AVFormatContext * s, int idx)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
BitstreamContext bc;
|
|
int mdt;
|
|
|
|
if (os->buf[os->pstart] == 0xff)
|
|
return 0;
|
|
|
|
bitstream_init8(&bc, os->buf + os->pstart, os->psize);
|
|
bitstream_skip(&bc, 1); /* metadata_last */
|
|
mdt = bitstream_read(&bc, 7);
|
|
|
|
if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
|
|
uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
|
|
uint32_t samplerate;
|
|
|
|
bitstream_skip(&bc, 4 * 8); /* "FLAC" */
|
|
if (bitstream_read(&bc, 8) != 1) /* unsupported major version */
|
|
return -1;
|
|
bitstream_skip(&bc, 8 + 16); /* minor version + header count */
|
|
bitstream_skip(&bc, 4 * 8); /* "fLaC" */
|
|
|
|
/* METADATA_BLOCK_HEADER */
|
|
if (bitstream_read(&bc, 32) != FLAC_STREAMINFO_SIZE)
|
|
return -1;
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
|
|
st->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
|
|
st->codecpar->extradata =
|
|
av_malloc(FLAC_STREAMINFO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
memcpy(st->codecpar->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
|
|
st->codecpar->extradata_size = FLAC_STREAMINFO_SIZE;
|
|
|
|
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
|
|
if (!samplerate)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, samplerate);
|
|
} else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
|
|
ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
old_flac_header (AVFormatContext * s, int idx)
|
|
{
|
|
AVStream *st = s->streams[idx];
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct ogg_codec ff_flac_codec = {
|
|
.magic = "\177FLAC",
|
|
.magicsize = 5,
|
|
.header = flac_header,
|
|
.nb_header = 2,
|
|
};
|
|
|
|
const struct ogg_codec ff_old_flac_codec = {
|
|
.magic = "fLaC",
|
|
.magicsize = 4,
|
|
.header = old_flac_header,
|
|
.nb_header = 0,
|
|
};
|