--- /dev/null
+/* GStreamer
+ *
+ * unit test for the audiosink base class
+ *
+ * Copyright (C) 2020 Seungha Yang <seungha.yang@navercorp.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/check/gstcheck.h>
+#include <gst/audio/gstaudiosink.h>
+
+#define GST_TYPE_AUDIO_FOO_SINK (gst_audio_foo_sink_get_type())
+#define GST_AUDIO_FOO_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FOO_SINK,GstAudioFooSink))
+#define GST_AUDIO_FOO_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_FOO_SINK,GstAudioFooSinkClass))
+typedef struct _GstAudioFooSink GstAudioFooSink;
+typedef struct _GstAudioFooSinkClass GstAudioFooSinkClass;
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS (GST_AUDIO_CAPS_MAKE (GST_AUDIO_FORMATS_ALL)));
+
+struct _GstAudioFooSink
+{
+ GstAudioSink parent;
+
+ guint num_clear_all_call;
+};
+
+struct _GstAudioFooSinkClass
+{
+ GstAudioSinkClass parent_class;
+};
+
+GType gst_audio_foo_sink_get_type (void);
+G_DEFINE_TYPE (GstAudioFooSink, gst_audio_foo_sink, GST_TYPE_AUDIO_SINK);
+
+static void
+gst_audio_foo_sink_clear_all (GstAudioSink * sink)
+{
+ GstAudioFooSink *self = GST_AUDIO_FOO_SINK (sink);
+
+ self->num_clear_all_call++;
+}
+
+static void
+gst_audio_foo_sink_init (GstAudioFooSink * src)
+{
+}
+
+static void
+gst_audio_foo_sink_class_init (GstAudioFooSinkClass * klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+ GstAudioSinkClass *audiosink_class = GST_AUDIO_SINK_CLASS (klass);
+
+ gst_element_class_add_static_pad_template (element_class, &sink_template);
+ gst_element_class_set_metadata (element_class,
+ "AudioFooSink", "Sink/Audio",
+ "Audio Sink Unit Test element", "Foo Bar <foo@bar.com>");
+
+ audiosink_class->extension->clear_all = gst_audio_foo_sink_clear_all;
+}
+
+GST_START_TEST (test_class_extension)
+{
+ GstAudioFooSink *foosink = NULL;
+ GstAudioBaseSink *bsink;
+ GstAudioRingBuffer *ringbuffer;
+
+ foosink = g_object_new (GST_TYPE_AUDIO_FOO_SINK, NULL);
+ fail_unless (foosink != NULL);
+
+ /* change state to READY to prepare audio ringbuffer */
+ fail_unless (gst_element_set_state (GST_ELEMENT (foosink),
+ GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
+
+ bsink = GST_AUDIO_BASE_SINK (foosink);
+ ringbuffer = bsink->ringbuffer;
+ fail_unless (ringbuffer != NULL);
+
+ /* This will invoke GstAudioSink::clear_all method */
+ gst_audio_ring_buffer_clear_all (ringbuffer);
+ fail_unless_equals_int (foosink->num_clear_all_call, 1);
+
+ gst_element_set_state (GST_ELEMENT (foosink), GST_STATE_NULL);
+ gst_clear_object (&foosink);
+}
+
+GST_END_TEST;
+
+
+static Suite *
+audiosink_suite (void)
+{
+ Suite *s = suite_create ("audiosink");
+ TCase *tc_chain = tcase_create ("general");
+
+ suite_add_tcase (s, tc_chain);
+ tcase_add_test (tc_chain, test_class_extension);
+
+ return s;
+}
+
+GST_CHECK_MAIN (audiosink)