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movenc: support for itunes tempo tag 

Implements support for tmpo atom for mp4 files, typically used to store BPM.  -metadata "tmpo=127" as a command line option will record 127 as the BPM in the meta data.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Kari Lentz 2012-08-24 15:37:47 -04:00 committed by Michael Niedermayer
parent 237f53ce85
commit be862c0dac
1 changed files with 19 additions and 0 deletions
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19
libavformat/movenc.c
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@ -1913,6 +1913,24 @@ static int mov_write_string_metadata(AVFormatContext *s, AVIOContext *pb,
return mov_write_string_tag(pb, name, t->value, lang, long_style);
}
/* iTunes bpm number */
static int mov_write_tmpo_tag(AVIOContext *pb, AVFormatContext *s)
{
AVDictionaryEntry *t = av_dict_get(s->metadata, "tmpo", NULL, 0);
int size = 0, tmpo = t ? atoi(t->value) : 0;
if (tmpo) {
size = 26;
avio_wb32(pb, size);
ffio_wfourcc(pb, "tmpo");
avio_wb32(pb, size-8); /* size */
ffio_wfourcc(pb, "data");
avio_wb32(pb, 0x15); //type specifier
avio_wb32(pb, 0);
avio_wb16(pb, tmpo); // data
}
return size;
}
/* iTunes track number */
static int mov_write_trkn_tag(AVIOContext *pb, MOVMuxContext *mov,
AVFormatContext *s)
@ -1960,6 +1978,7 @@ static int mov_write_ilst_tag(AVIOContext *pb, MOVMuxContext *mov,
mov_write_string_metadata(s, pb, "tven", "episode_id",1);
mov_write_string_metadata(s, pb, "tvnn", "network" , 1);
mov_write_trkn_tag(pb, mov, s);
mov_write_tmpo_tag(pb, s);
return update_size(pb, pos);
}