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matroskademux: Add comment about Opus clipping

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https://bugzilla.gnome.org/show_bug.cgi?id=793523
This commit is contained in:
Alicia Boya García 2018-02-16 23:40:50 +01:00 committed by Philippe Normand
parent 2d774554e9
commit a5e93b7062
1 changed files with 7 additions and 0 deletions
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7
gst/matroska/matroska-demux.c
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@ -4057,6 +4057,13 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
GST_BUFFER_PTS (sub) -= stream->codec_delay;
} else {
GST_BUFFER_PTS (sub) = 0;
/* Opus GstAudioClippingMeta units are scaled by 48000/sample_rate.
That is, if a Opus track has audio encoded at 24000 Hz and 132
samples need to be clipped, GstAudioClippingMeta.start will be
set to 264. (This is also the case for buffer offsets.)
Opus sample rates are always divisors of 48000 Hz, which is the
maximum allowed sample rate. */
start_clip =
gst_util_uint64_scale_round (stream->codec_delay, 48000,
GST_SECOND);