mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.5 KiB
82 lines
2.5 KiB
/* |
|
* 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 "avformat.h" |
|
#include "bitstream.h" |
|
#include "ogg2.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(&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; |
|
} |
|
|
|
ogg_codec_t flac_codec = { |
|
.magic = "\177FLAC", |
|
.magicsize = 5, |
|
.header = flac_header |
|
};
|
|
|