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kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

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kmssink keeps a reference on the last rendered buffer. If this buffer
refers to an upstream buffer, it should be should be released on DRAIN
and ALLOCATION queries so all upstream buffers can be returned to the
pool if needed. As the buffer may be used for scanout, we copy this
buffer into a dumb buffer prior to let it go.

Based on patch from Guillaume Desmottes <guillaume.desmottes@collabora.com>

https://bugzilla.gnome.org/show_bug.cgi?id=782774
This commit is contained in:
Nicolas Dufresne 2017-05-18 11:54:31 +02:00
parent cfadd5a936
commit b8c5a4c9ed
1 changed files with 47 additions and 0 deletions
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47
sys/kms/gstkmssink.c
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@ -70,6 +70,8 @@ G_DEFINE_TYPE_WITH_CODE (GstKMSSink, gst_kms_sink, GST_TYPE_VIDEO_SINK,
GST_PLUGIN_DESC);
GST_DEBUG_CATEGORY_GET (CAT_PERFORMANCE, "GST_PERFORMANCE"));
static void gst_kms_sink_drain (GstKMSSink * self);
enum
{
PROP_DRIVER_NAME = 1,
@ -825,6 +827,11 @@ gst_kms_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
self = GST_KMS_SINK (bsink);
/* We are going to change the internal buffer pool, which means it will no
* longer be compatbile with the last_buffer size. Drain now, as we won't be
* able to do that later on. */
gst_kms_sink_drain (self);
if (!gst_video_info_from_caps (&vinfo, caps))
goto invalid_format;
@ -1336,6 +1343,45 @@ no_disp_ratio:
}
}
static void
gst_kms_sink_drain (GstKMSSink * self)
{
GstParentBufferMeta *parent_meta;
GST_DEBUG_OBJECT (self, "draining");
if (!self->last_buffer)
return;
/* We only need to return the last_buffer if it depends on upstream buffer.
* In this case, the last_buffer will have a GstParentBufferMeta set. */
parent_meta = gst_buffer_get_parent_buffer_meta (self->last_buffer);
if (parent_meta) {
GstBuffer *dumb_buf;
dumb_buf = gst_kms_sink_copy_to_dumb_buffer (self, parent_meta->buffer);
gst_kms_sink_show_frame (GST_VIDEO_SINK (self), dumb_buf);
}
}
static gboolean
gst_kms_sink_query (GstBaseSink * bsink, GstQuery * query)
{
GstKMSSink *self = GST_KMS_SINK (bsink);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
case GST_QUERY_DRAIN:
{
gst_kms_sink_drain (self);
break;
}
default:
break;
}
return GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
}
static void
gst_kms_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
@ -1440,6 +1486,7 @@ gst_kms_sink_class_init (GstKMSSinkClass * klass)
basesink_class->set_caps = GST_DEBUG_FUNCPTR (gst_kms_sink_set_caps);
basesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_kms_sink_get_caps);
basesink_class->propose_allocation = gst_kms_sink_propose_allocation;
basesink_class->query = gst_kms_sink_query;
videosink_class->show_frame = gst_kms_sink_show_frame;