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codecalphademux: Fix handling of flow combine

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As the alphacombine is simplified to received matching pair of buffers,
we can't just stop streaming when we receive EOS from downstream. Due
to usage of queue, the moment we get this return value may differ.

Though, by continuing pushing, we override the last_flowret on the pad
which can make us miss that we effectively can combine all flow into
EOS.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2238>
This commit is contained in:
Nicolas Dufresne 2021-05-12 15:13:11 -04:00 committed by GStreamer Marge Bot
parent 61a04cf51f
commit ea08442699
1 changed files with 29 additions and 8 deletions
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37
gst/codecalpha/gstcodecalphademux.c
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@ -102,25 +102,46 @@ gst_codec_alpha_demux_chain (GstPad * pad, GstObject * object,
GstClockTime pts = GST_BUFFER_PTS (buffer);
GstClockTime duration = GST_BUFFER_DURATION (buffer);
GstFlowReturn ret;
gboolean src_pad_eos, alpha_pad_eos;
if (alpha_meta)
alpha_buffer = gst_buffer_ref (alpha_meta->buffer);
ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
self->src_pad, gst_pad_push (self->src_pad, buffer));
/* To satisfy the alphacombine requirement, we need to push in pair here, so we
* can't just stop pushing at EOS. For this reason, remember if pad had a
* flow return of EOS and set it back if needed. */
src_pad_eos = (GST_PAD_LAST_FLOW_RETURN (self->src_pad) == GST_FLOW_EOS);
alpha_pad_eos = (GST_PAD_LAST_FLOW_RETURN (self->alpha_pad) == GST_FLOW_EOS);
if (src_pad_eos && alpha_pad_eos) {
gst_buffer_unref (alpha_buffer);
gst_buffer_unref (buffer);
return GST_FLOW_EOS;
}
ret = gst_pad_push (self->src_pad, buffer);
/* we lost ownership here */
buffer = NULL;
alpha_meta = NULL;
if (alpha_buffer)
ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
self->alpha_pad, gst_pad_push (self->alpha_pad, alpha_buffer));
if (ret == GST_FLOW_OK && src_pad_eos)
gst_flow_combiner_update_pad_flow (self->flow_combiner, self->src_pad,
GST_FLOW_EOS);
else
ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
self->alpha_pad, gst_pad_push_event (self->alpha_pad,
gst_event_new_gap (pts, duration)));
gst_flow_combiner_update_flow (self->flow_combiner, ret);
if (alpha_buffer)
ret = gst_pad_push (self->alpha_pad, alpha_buffer);
else
ret = gst_pad_push_event (self->alpha_pad,
gst_event_new_gap (pts, duration));
if (ret == GST_FLOW_OK && alpha_pad_eos)
ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
self->alpha_pad, GST_FLOW_EOS);
else
ret = gst_flow_combiner_update_flow (self->flow_combiner, ret);
return ret;
}