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audiobasesink: Fix custom slaving driftsamples calculation

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driftsamples currently uses the requested skew directly, even if it
exceeds cexternal.

Use the approach that skew_slaving uses to fix this. As a side benefit,
this makes the custom_slaving and skew_slaving code easier to compare.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8605>
This commit is contained in:
Carlos Rafael Giani 2025-03-11 09:30:29 +01:00 committed by GStreamer Marge Bot
parent a59810ef97
commit 9ffab2199d
1 changed files with 15 additions and 7 deletions
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22
subprojects/gst-plugins-base/gst-libs/gst/audio/gstaudiobasesink.c
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@ -1262,7 +1262,7 @@ gst_audio_base_sink_custom_slaving (GstAudioBaseSink * sink,
{
GstClockTime cinternal, cexternal, crate_num, crate_denom;
GstClockTime etime, itime;
GstClockTimeDiff requested_skew;
GstClockTimeDiff requested_skew, drift;
gint driftsamples;
gint64 last_align;
@ -1300,10 +1300,18 @@ gst_audio_base_sink_custom_slaving (GstAudioBaseSink * sink,
}
if (requested_skew > 0) {
cexternal = (cexternal > requested_skew) ? (cexternal - requested_skew) : 0;
/* Move the external time backward by the requested skew, but don't ever
* go negative. Moving the requested skew by the same distance defines
* the new clock skew window center point. This allows the clock to
* drift equally into either direction after the correction. */
if (G_LIKELY (cexternal > requested_skew))
drift = requested_skew;
else
drift = cexternal;
driftsamples =
(sink->ringbuffer->spec.info.rate * requested_skew) / GST_SECOND;
cexternal -= drift;
driftsamples = (sink->ringbuffer->spec.info.rate * drift) / GST_SECOND;
last_align = sink->priv->last_align;
/* if we were aligning in the wrong direction or we aligned more than what we
@ -1318,10 +1326,10 @@ gst_audio_base_sink_custom_slaving (GstAudioBaseSink * sink,
gst_clock_set_calibration (sink->provided_clock, cinternal, cexternal,
crate_num, crate_denom);
} else if (requested_skew < 0) {
cexternal += ABS (requested_skew);
drift = -requested_skew;
cexternal += drift;
driftsamples =
(sink->ringbuffer->spec.info.rate * ABS (requested_skew)) / GST_SECOND;
driftsamples = (sink->ringbuffer->spec.info.rate * drift) / GST_SECOND;
last_align = sink->priv->last_align;
/* if we were aligning in the wrong direction or we aligned more than what we