mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
|
|
* Copyright (C) 2005 Matthieu CASTET
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include "libavcodec/bitstream.h"
|
|
#include "avformat.h"
|
|
#include "oggdec.h"
|
|
|
|
#define FLAC_STREAMINFO_SIZE 0x22
|
|
|
|
static int
|
|
flac_header (AVFormatContext * s, int idx)
|
|
{
|
|
ogg_t *ogg = s->priv_data;
|
|
ogg_stream_t *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
GetBitContext gb;
|
|
int mdt;
|
|
|
|
if (os->buf[os->pstart] == 0xff)
|
|
return 0;
|
|
|
|
init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
|
|
get_bits(&gb, 1); /* metadata_last */
|
|
mdt = get_bits(&gb, 7);
|
|
|
|
if (mdt == 0x7f) {
|
|
skip_bits(&gb, 4*8); /* "FLAC" */
|
|
if(get_bits(&gb, 8) != 1) /* unsupported major version */
|
|
return -1;
|
|
skip_bits(&gb, 8 + 16); /* minor version + header count */
|
|
skip_bits(&gb, 4*8); /* "fLaC" */
|
|
|
|
/* METADATA_BLOCK_HEADER */
|
|
if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
|
|
return -1;
|
|
|
|
skip_bits(&gb, 16*2+24*2);
|
|
|
|
st->codec->sample_rate = get_bits_long(&gb, 20);
|
|
st->codec->channels = get_bits(&gb, 3) + 1;
|
|
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_FLAC;
|
|
|
|
st->codec->extradata =
|
|
av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
|
|
FLAC_STREAMINFO_SIZE);
|
|
st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
|
|
|
|
st->time_base.num = 1;
|
|
st->time_base.den = st->codec->sample_rate;
|
|
} else if (mdt == 4) {
|
|
vorbis_comment (s, 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->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_FLAC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const ogg_codec_t ff_flac_codec = {
|
|
.magic = "\177FLAC",
|
|
.magicsize = 5,
|
|
.header = flac_header
|
|
};
|
|
|
|
const ogg_codec_t ff_old_flac_codec = {
|
|
.magic = "fLaC",
|
|
.magicsize = 4,
|
|
.header = old_flac_header
|
|
};
|