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appsink: Reuse sample object in pull_sample if possible

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Simple optimization to reduce memory allocations.

https://bugzilla.gnome.org/show_bug.cgi?id=795145
This commit is contained in:
Mathieu Duponchelle 2018-04-11 00:57:43 +02:00
parent 89d0e9cc92
commit d00e0b612d
2 changed files with 74 additions and 4 deletions
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29
gst-libs/gst/app/gstappsink.c
View file

@ -107,6 +107,8 @@ struct _GstAppSinkPrivate
GstAppSinkCallbacks callbacks;
gpointer user_data;
GDestroyNotify notify;
GstSample *sample;
};
GST_DEBUG_CATEGORY_STATIC (app_sink_debug);
@ -461,6 +463,7 @@ gst_app_sink_init (GstAppSink * appsink)
g_mutex_init (&priv->mutex);
g_cond_init (&priv->cond);
priv->queue = gst_queue_array_new (16);
priv->sample = gst_sample_new (NULL, NULL, NULL, NULL);
priv->emit_signals = DEFAULT_PROP_EMIT_SIGNALS;
priv->max_buffers = DEFAULT_PROP_MAX_BUFFERS;
@ -496,6 +499,10 @@ gst_app_sink_dispose (GObject * obj)
gst_buffer_replace (&priv->preroll_buffer, NULL);
gst_caps_replace (&priv->preroll_caps, NULL);
gst_caps_replace (&priv->last_caps, NULL);
if (priv->sample) {
gst_sample_unref (priv->sample);
priv->sample = NULL;
}
g_mutex_unlock (&priv->mutex);
G_OBJECT_CLASS (parent_class)->dispose (obj);
@ -646,6 +653,11 @@ gst_app_sink_start (GstBaseSink * psink)
priv->started = TRUE;
gst_segment_init (&priv->preroll_segment, GST_FORMAT_TIME);
gst_segment_init (&priv->last_segment, GST_FORMAT_TIME);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer (priv->sample, NULL);
gst_sample_set_buffer_list (priv->sample, NULL);
gst_sample_set_caps (priv->sample, NULL);
gst_sample_set_segment (priv->sample, NULL);
g_mutex_unlock (&priv->mutex);
return TRUE;
@ -818,10 +830,14 @@ dequeue_buffer (GstAppSink * appsink)
gst_event_parse_caps (event, &caps);
GST_DEBUG_OBJECT (appsink, "activating caps %" GST_PTR_FORMAT, caps);
gst_caps_replace (&priv->last_caps, caps);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_caps (priv->sample, priv->last_caps);
break;
}
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &priv->last_segment);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_segment (priv->sample, &priv->last_segment);
GST_DEBUG_OBJECT (appsink, "activated segment %" GST_SEGMENT_FORMAT,
&priv->last_segment);
break;
@ -854,6 +870,7 @@ restart:
if (G_UNLIKELY (!priv->last_caps &&
gst_pad_has_current_caps (GST_BASE_SINK_PAD (psink)))) {
priv->last_caps = gst_pad_get_current_caps (GST_BASE_SINK_PAD (psink));
gst_sample_set_caps (priv->sample, priv->last_caps);
GST_DEBUG_OBJECT (appsink, "activating pad caps %" GST_PTR_FORMAT,
priv->last_caps);
}
@ -1622,12 +1639,16 @@ gst_app_sink_try_pull_sample (GstAppSink * appsink, GstClockTime timeout)
obj = dequeue_buffer (appsink);
if (GST_IS_BUFFER (obj)) {
GST_DEBUG_OBJECT (appsink, "we have a buffer %p", obj);
sample = gst_sample_new (GST_BUFFER_CAST (obj), priv->last_caps,
&priv->last_segment, NULL);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer_list (priv->sample, NULL);
gst_sample_set_buffer (priv->sample, GST_BUFFER_CAST (obj));
sample = gst_sample_ref (priv->sample);
} else {
GST_DEBUG_OBJECT (appsink, "we have a list %p", obj);
sample = gst_sample_new (NULL, priv->last_caps, &priv->last_segment, NULL);
gst_sample_set_buffer_list (sample, GST_BUFFER_LIST_CAST (obj));
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer (priv->sample, NULL);
gst_sample_set_buffer_list (priv->sample, GST_BUFFER_LIST_CAST (obj));
sample = gst_sample_ref (priv->sample);
}
gst_mini_object_unref (obj);

49
tests/check/elements/appsink.c
View file

@ -666,6 +666,54 @@ GST_START_TEST (test_query_drain)
GST_END_TEST;
GST_START_TEST (test_pull_sample_refcounts)
{
GstElement *sink;
GstBuffer *buffer;
GstSample *s1, *s2, *s3;
sink = setup_appsink ();
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
buffer = gst_buffer_new_and_alloc (4);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s1 = gst_app_sink_pull_sample (GST_APP_SINK (sink));
fail_unless (s1 != NULL);
fail_unless (gst_buffer_get_size (gst_sample_get_buffer (s1)) == 4);
gst_sample_unref (s1);
buffer = gst_buffer_new_and_alloc (6);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s2 = gst_app_sink_pull_sample (GST_APP_SINK (sink));
fail_unless (s2 != NULL);
fail_unless (gst_buffer_get_size (gst_sample_get_buffer (s2)) == 6);
/* We unreffed s1, appsink should thus reuse the same sample,
* avoiding an extra allocation */
fail_unless (s1 == s2);
buffer = gst_buffer_new_and_alloc (8);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s3 = gst_app_sink_pull_sample (GST_APP_SINK (sink));
fail_unless (s3 != NULL);
fail_unless (gst_buffer_get_size (gst_sample_get_buffer (s2)) == 6);
fail_unless (gst_buffer_get_size (gst_sample_get_buffer (s3)) == 8);
/* We didn't unref s2, appsink should thus have created a new sample */
fail_unless (s2 != s3);
gst_sample_unref (s2);
gst_sample_unref (s3);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
static Suite *
appsink_suite (void)
{
@ -686,6 +734,7 @@ appsink_suite (void)
tcase_add_test (tc_chain, test_query_drain);
tcase_add_test (tc_chain, test_pull_preroll);
tcase_add_test (tc_chain, test_do_not_care_preroll);
tcase_add_test (tc_chain, test_pull_sample_refcounts);
return s;
}