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avformat/movenc: allow writing out channel count in MP4 and 3GP 

ISOBMFF (14496-12) made this field ('channelcount') in the
AudioSampleEntry structure non-template¹ somewhere before the
release of the 2022 edition. As for ETSI TS 126 244 AKA 3GPP
file format (V16.1.0, 2020-10), it does not seem contain any
references limiting the channelcount entry in AudioSampleEntry
or in its own definition of EVSSampleEntry.

fate-mov-mp4-chapters test had to be adjusted as it output a
mono vorbis stream, which would now be properly marked as such
in the container.

1: As per 14496-12:
   Fields shown as “template” in the box descriptions are fields
   which are coded with a default value unless a derived
   specification defines their use and permits writers to use
   other values than the default.
This commit is contained in:
Jan Ekström 2023-02-07 21:37:10 +02:00
parent 264cf75214
commit 02ddfeadbe
2 changed files with 2 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libavformat/movenc.c
View File

@ -1241,13 +1241,7 @@ static int mov_write_audio_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
avio_wb16(pb, 16);
avio_wb16(pb, track->audio_vbr ? -2 : 0); /* compression ID */
} else { /* reserved for mp4/3gp */
if (track->par->codec_id == AV_CODEC_ID_FLAC ||
track->par->codec_id == AV_CODEC_ID_ALAC ||
track->par->codec_id == AV_CODEC_ID_OPUS) {
avio_wb16(pb, track->par->ch_layout.nb_channels);
} else {
avio_wb16(pb, 2);
}
avio_wb16(pb, track->par->ch_layout.nb_channels);
if (track->par->codec_id == AV_CODEC_ID_FLAC ||
track->par->codec_id == AV_CODEC_ID_ALAC) {
avio_wb16(pb, track->par->bits_per_raw_sample);

2
tests/ref/fate/mov-mp4-chapters
View File

@ -1,4 +1,4 @@
1fd844c2f5bf77c3344e88e30ad994e1 *tests/data/fate/mov-mp4-chapters.mp4
7b6aaa99c86fa1f5abfc9f242abcfffa *tests/data/fate/mov-mp4-chapters.mp4
111248 tests/data/fate/mov-mp4-chapters.mp4
#extradata 0: 3469, 0xc6769ddc
#tb 0: 1/44100