mirror of https://git.ffmpeg.org/ffmpeg.git
141 lines
4.0 KiB
C
141 lines
4.0 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/get_bits.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];
|
|
GetBitContext gb;
|
|
int mdt, ret;
|
|
|
|
if (os->buf[os->pstart] == 0xff)
|
|
return 0;
|
|
|
|
init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
|
|
skip_bits1(&gb); /* metadata_last */
|
|
mdt = get_bits(&gb, 7);
|
|
|
|
if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
|
|
uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
|
|
uint32_t samplerate;
|
|
|
|
skip_bits_long(&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_long(&gb, 4*8); /* "fLaC" */
|
|
|
|
/* METADATA_BLOCK_HEADER */
|
|
if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
|
|
return -1;
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
|
|
ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
|
|
if ((ret = ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE)) < 0)
|
|
return ret;
|
|
memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_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)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
AVStream *st = s->streams[idx];
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
|
|
AVCodecContext *avctx;
|
|
int size, ret;
|
|
uint8_t *data;
|
|
|
|
if (!parser)
|
|
return -1;
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
|
|
|
|
avctx = avcodec_alloc_context3(NULL);
|
|
if (!avctx) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
ret = avcodec_parameters_to_context(avctx, st->codecpar);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
|
|
av_parser_parse2(parser, avctx,
|
|
&data, &size, os->buf + os->pstart, os->psize,
|
|
AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
|
|
|
|
av_parser_close(parser);
|
|
|
|
if (avctx->sample_rate) {
|
|
avpriv_set_pts_info(st, 64, 1, avctx->sample_rate);
|
|
avcodec_free_context(&avctx);
|
|
return 0;
|
|
}
|
|
|
|
avcodec_free_context(&avctx);
|
|
return 1;
|
|
fail:
|
|
av_parser_close(parser);
|
|
avcodec_free_context(&avctx);
|
|
return ret;
|
|
}
|
|
|
|
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,
|
|
};
|