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flac muxer: write WAVEFORMATEXTENSIBLE_CHANNEL_MASK tag for multichannel files

This commit is contained in:
Anton Khirnov 2014-05-25 11:34:32 +02:00
parent d6b9ce99ea
commit 54ed488b1a
3 changed files with 36 additions and 0 deletions
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18
libavformat/flacenc.c
View File

@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavcodec/flac.h"
#include "avformat.h"
@ -83,6 +84,23 @@ static int flac_write_header(struct AVFormatContext *s)
if (ret)
return ret;
/* add the channel layout tag */
if (codec->channel_layout &&
!(codec->channel_layout & ~0x3ffffULL) &&
!ff_flac_is_native_layout(codec->channel_layout)) {
AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
NULL, 0);
if (chmask) {
av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
"already present, this muxer will not overwrite it.\n");
} else {
uint8_t buf[32];
snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
}
}
ret = flac_write_block_comment(s->pb, &s->metadata, 0,
s->flags & AVFMT_FLAG_BITEXACT);
if (ret)

2
libavformat/flacenc.h
View File

@ -29,4 +29,6 @@
int ff_flac_write_header(AVIOContext *pb, AVCodecContext *codec,
int last_block);
int ff_flac_is_native_layout(uint64_t channel_layout);
#endif /* AVFORMAT_FLACENC_H */

16
libavformat/flacenc_header.c
View File

@ -19,6 +19,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavcodec/flac.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
@ -45,3 +47,17 @@ int ff_flac_write_header(AVIOContext *pb, AVCodecContext *codec,
return 0;
}
int ff_flac_is_native_layout(uint64_t channel_layout)
{
if (channel_layout == AV_CH_LAYOUT_MONO ||
channel_layout == AV_CH_LAYOUT_STEREO ||
channel_layout == AV_CH_LAYOUT_SURROUND ||
channel_layout == AV_CH_LAYOUT_QUAD ||
channel_layout == AV_CH_LAYOUT_5POINT0 ||
channel_layout == AV_CH_LAYOUT_5POINT1 ||
channel_layout == AV_CH_LAYOUT_6POINT1 ||
channel_layout == AV_CH_LAYOUT_7POINT1)
return 1;
return 0;
}