caee91f7 |
/*
* raw FLAC muxer
* Copyright (c) 2006-2009 Justin Ruggles
*
* 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
*/
|
59c6178a |
#include "libavcodec/flac.h" |
caee91f7 |
#include "avformat.h" |
96db307b |
#include "avio_internal.h" |
2578326f |
#include "flacenc.h" |
66061a12 |
#include "vorbiscomment.h"
#include "libavcodec/bytestream.h" |
caee91f7 |
|
ae628ec1 |
static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes, |
66061a12 |
int last_block)
{ |
77eb5504 |
avio_w8(pb, last_block ? 0x81 : 0x01);
avio_wb24(pb, n_padding_bytes); |
96db307b |
ffio_fill(pb, 0, n_padding_bytes); |
66061a12 |
return 0;
}
|
d2d67e42 |
static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m, |
66061a12 |
int last_block, int bitexact)
{
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
unsigned int len, count;
uint8_t *p, *p0;
|
042ca05f |
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
|
81e5ff7a |
len = ff_vorbiscomment_length(*m, vendor, &count); |
66061a12 |
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);
|
77eb5504 |
avio_write(pb, p0, len+4); |
66061a12 |
av_freep(&p0);
p = NULL;
return 0;
}
|
2578326f |
static int flac_write_header(struct AVFormatContext *s)
{ |
66061a12 |
int ret;
AVCodecContext *codec = s->streams[0]->codec;
|
cb0add3c |
if (s->nb_streams > 1) {
av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
return AVERROR(EINVAL);
}
if (codec->codec_id != AV_CODEC_ID_FLAC) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR(EINVAL);
}
|
66061a12 |
ret = ff_flac_write_header(s->pb, codec, 0);
if (ret)
return ret;
|
81e5ff7a |
ret = flac_write_block_comment(s->pb, &s->metadata, 0, |
66061a12 |
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; |
2578326f |
}
|
caee91f7 |
static int flac_write_trailer(struct AVFormatContext *s)
{ |
ae628ec1 |
AVIOContext *pb = s->pb; |
59c6178a |
uint8_t *streaminfo;
enum FLACExtradataFormat format; |
caee91f7 |
int64_t file_size;
|
d9cca9fc |
if (!avpriv_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo)) |
59c6178a |
return -1;
|
8978feda |
if (pb->seekable) { |
59c6178a |
/* rewrite the STREAMINFO header block data */ |
a2704c97 |
file_size = avio_tell(pb); |
6b4aa5da |
avio_seek(pb, 8, SEEK_SET); |
77eb5504 |
avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE); |
6b4aa5da |
avio_seek(pb, file_size, SEEK_SET); |
b7f2fdde |
avio_flush(pb); |
59c6178a |
} else {
av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n"); |
caee91f7 |
}
return 0;
}
static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{ |
77eb5504 |
avio_write(s->pb, pkt->data, pkt->size); |
caee91f7 |
return 0;
}
|
c6610a21 |
AVOutputFormat ff_flac_muxer = { |
dfc2c4d9 |
.name = "flac",
.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
.mime_type = "audio/x-flac",
.extensions = "flac", |
36ef5369 |
.audio_codec = AV_CODEC_ID_FLAC,
.video_codec = AV_CODEC_ID_NONE, |
dfc2c4d9 |
.write_header = flac_write_header,
.write_packet = flac_write_packet,
.write_trailer = flac_write_trailer, |
20234a4b |
.flags = AVFMT_NOTIMESTAMPS, |
caee91f7 |
}; |