mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*
|
|
* raw FLAC muxer
|
|
* Copyright (c) 2006-2009 Justin Ruggles
|
|
*
|
|
* 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 "flacenc.h"
|
|
#include "metadata.h"
|
|
#include "vorbiscomment.h"
|
|
#include "libavcodec/bytestream.h"
|
|
|
|
|
|
static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
|
|
int last_block)
|
|
{
|
|
avio_w8(pb, last_block ? 0x81 : 0x01);
|
|
avio_wb24(pb, n_padding_bytes);
|
|
while (n_padding_bytes > 0) {
|
|
avio_w8(pb, 0);
|
|
n_padding_bytes--;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int flac_write_block_comment(AVIOContext *pb, AVMetadata **m,
|
|
int last_block, int bitexact)
|
|
{
|
|
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
|
|
unsigned int len, count;
|
|
uint8_t *p, *p0;
|
|
|
|
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
|
|
|
|
len = ff_vorbiscomment_length(*m, vendor, &count);
|
|
p0 = av_malloc(len+4);
|
|
if (!p0)
|
|
return AVERROR(ENOMEM);
|
|
p = p0;
|
|
|
|
bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
|
|
bytestream_put_be24(&p, len);
|
|
ff_vorbiscomment_write(&p, m, vendor, count);
|
|
|
|
avio_write(pb, p0, len+4);
|
|
av_freep(&p0);
|
|
p = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flac_write_header(struct AVFormatContext *s)
|
|
{
|
|
int ret;
|
|
AVCodecContext *codec = s->streams[0]->codec;
|
|
|
|
ret = ff_flac_write_header(s->pb, codec, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = flac_write_block_comment(s->pb, &s->metadata, 0,
|
|
codec->flags & CODEC_FLAG_BITEXACT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* The command line flac encoder defaults to placing a seekpoint
|
|
* every 10s. So one might add padding to allow that later
|
|
* but there seems to be no simple way to get the duration here.
|
|
* So let's try the flac default of 8192 bytes */
|
|
flac_write_block_padding(s->pb, 8192, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int flac_write_trailer(struct AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
uint8_t *streaminfo;
|
|
enum FLACExtradataFormat format;
|
|
int64_t file_size;
|
|
|
|
if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
|
|
return -1;
|
|
|
|
if (pb->seekable) {
|
|
/* rewrite the STREAMINFO header block data */
|
|
file_size = avio_tell(pb);
|
|
avio_seek(pb, 8, SEEK_SET);
|
|
avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
|
|
avio_seek(pb, file_size, SEEK_SET);
|
|
avio_flush(pb);
|
|
} else {
|
|
av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
avio_write(s->pb, pkt->data, pkt->size);
|
|
avio_flush(s->pb);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_flac_muxer = {
|
|
"flac",
|
|
NULL_IF_CONFIG_SMALL("raw FLAC"),
|
|
"audio/x-flac",
|
|
"flac",
|
|
0,
|
|
CODEC_ID_FLAC,
|
|
CODEC_ID_NONE,
|
|
flac_write_header,
|
|
flac_write_packet,
|
|
flac_write_trailer,
|
|
.flags= AVFMT_NOTIMESTAMPS,
|
|
};
|