gstreamer/tests/check/elements/appsink.c

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/* GStreamer
*
* Copyright (C) 2009, Axis Communications AB, LUND, SWEDEN
*
* 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/app/gstappsink.h>
gint global_testdata;
static GstPad *mysrcpad;
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-gst-check")
);
static GstElement *
setup_appsink (void)
{
GstElement *appsink;
GstCaps *caps;
GST_DEBUG ("setup_appsink");
appsink = gst_check_setup_element ("appsink");
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mysrcpad = gst_check_setup_src_pad (appsink, &srctemplate);
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gst_pad_set_active (mysrcpad, TRUE);
caps = gst_caps_new_empty_simple ("application/x-gst-check");
gst_check_setup_events (mysrcpad, appsink, caps, GST_FORMAT_TIME);
gst_caps_unref (caps);
return appsink;
}
static void
cleanup_appsink (GstElement * appsink)
{
GST_DEBUG ("cleanup_appsink");
gst_check_teardown_src_pad (appsink);
gst_check_teardown_element (appsink);
}
/* This function does an operation to it's indata argument and returns it.
* The exact operation performed doesn't matter. Currently it multiplies with
* two, but it could do anything. The idea is to use the function to verify
* that the code calling it gets run. */
static gint
operate_on_data (gint indata)
{
return indata * 2;
}
static GstFlowReturn
callback_function (GstAppSink * appsink, gpointer callback_data)
{
global_testdata = operate_on_data (*((gint *) callback_data));
return GST_FLOW_OK;
}
static void
notify_function (gpointer callback_data)
{
global_testdata = operate_on_data (*((gint *) callback_data));
}
GST_START_TEST (test_non_clients)
{
GstElement *sink;
GstBuffer *buffer;
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);
GST_DEBUG ("cleaning up appsink");
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
/* Verifies that the handoff callback gets run one time when passing a buffer */
GST_START_TEST (test_handoff_callback)
{
GstElement *sink;
GstBuffer *buffer;
gint testdata;
GstAppSinkCallbacks callbacks = { NULL };
sink = setup_appsink ();
global_testdata = 0;
testdata = 5; /* Arbitrary value */
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callbacks.new_sample = callback_function;
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks, &testdata, NULL);
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
buffer = gst_buffer_new_and_alloc (4);
/* Pushing a buffer should run our callback */
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
testdata = operate_on_data (testdata);
/* If both test_data & global_testdata have been operated on, we're happy. */
fail_unless (testdata == global_testdata);
GST_DEBUG ("cleaning up appsink");
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
/* Verifies that the notify function gets executed when the sink is destroyed */
GST_START_TEST (test_notify0)
{
GstElement *sink;
gint testdata;
GstAppSinkCallbacks callbacks = { NULL };
sink = gst_element_factory_make ("appsink", NULL);
global_testdata = 0;
testdata = 17; /* Arbitrary value */
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks,
&testdata, (*notify_function));
GST_DEBUG ("cleaning up appsink");
/* Destroying sink should call our notify_function */
gst_object_unref (sink);
testdata = operate_on_data (testdata);
/* If both test_data & global_testdata have been operated on, we're happy. */
fail_unless (testdata == global_testdata);
}
GST_END_TEST;
/* Verifies that the notify function gets executed when
* gst_app_sink_set_callbacks () gets called */
GST_START_TEST (test_notify1)
{
GstElement *sink;
gint testdata;
GstAppSinkCallbacks callbacks = { NULL };
sink = gst_element_factory_make ("appsink", NULL);
global_testdata = 0;
testdata = 42; /* Arbitrary value */
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks,
&testdata, (*notify_function));
/* Setting new callbacks should trigger the destroy of the old data */
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks, &testdata, NULL);
testdata = operate_on_data (testdata);
/* If both test_data & global_testdata have been operated on, we're happy. */
fail_unless (testdata == global_testdata);
GST_DEBUG ("cleaning up appsink");
gst_object_unref (sink);
}
GST_END_TEST;
static const gint values[] = { 1, 2, 4 };
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static GstBufferList *
create_buffer_list (void)
{
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guint len;
GstBuffer *buffer;
GstBufferList *mylist;
mylist = gst_buffer_list_new ();
fail_if (mylist == NULL);
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len = gst_buffer_list_length (mylist);
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fail_if (len != 0);
buffer = gst_buffer_new_and_alloc (sizeof (gint));
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gst_buffer_fill (buffer, 0, &values[0], sizeof (gint));
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gst_buffer_list_add (mylist, buffer);
buffer = gst_buffer_new_and_alloc (sizeof (gint));
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gst_buffer_fill (buffer, 0, &values[1], sizeof (gint));
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gst_buffer_list_add (mylist, buffer);
buffer = gst_buffer_new_and_alloc (sizeof (gint));
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gst_buffer_fill (buffer, 0, &values[2], sizeof (gint));
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gst_buffer_list_add (mylist, buffer);
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return mylist;
}
static GstFlowReturn
callback_function_sample_fallback (GstAppSink * appsink, gpointer p_counter)
{
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GstSample *sample;
GstBuffer *buf;
gint *p_int_counter = p_counter;
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sample = gst_app_sink_pull_sample (appsink);
buf = gst_sample_get_buffer (sample);
fail_unless (GST_IS_BUFFER (buf));
/* buffer list has 3 buffers in two groups */
switch (*p_int_counter) {
case 0:
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fail_unless_equals_int (gst_buffer_get_size (buf), sizeof (gint));
gst_check_buffer_data (buf, &values[0], sizeof (gint));
break;
case 1:
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fail_unless_equals_int (gst_buffer_get_size (buf), sizeof (gint));
gst_check_buffer_data (buf, &values[1], sizeof (gint));
break;
case 2:
fail_unless_equals_int (gst_buffer_get_size (buf), sizeof (gint));
gst_check_buffer_data (buf, &values[2], sizeof (gint));
break;
default:
g_warn_if_reached ();
break;
}
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gst_sample_unref (sample);
*p_int_counter += 1;
return GST_FLOW_OK;
}
static GstFlowReturn
callback_function_sample (GstAppSink * appsink, gpointer p_counter)
{
GstSample *sample;
GstBufferList *list;
gint *p_int_counter = p_counter;
guint len;
gint i;
sample = gst_app_sink_pull_sample (appsink);
list = gst_sample_get_buffer_list (sample);
fail_unless (GST_IS_BUFFER_LIST (list));
len = gst_buffer_list_length (list);
fail_unless_equals_int (len, 3);
for (i = 0; i < len; i++) {
GstBuffer *buf = gst_buffer_list_get (list, i);
fail_unless_equals_int (gst_buffer_get_size (buf), sizeof (gint));
gst_check_buffer_data (buf, &values[i], sizeof (gint));
}
gst_sample_unref (sample);
*p_int_counter += 1;
return GST_FLOW_OK;
}
GST_START_TEST (test_buffer_list_fallback)
{
GstElement *sink;
GstBufferList *list;
GstAppSinkCallbacks callbacks = { NULL };
gint counter = 0;
gboolean buffer_list_support;
sink = setup_appsink ();
/* verify that the buffer list support is disabled per default */
g_object_get (sink, "buffer-list", &buffer_list_support, NULL);
fail_unless (buffer_list_support == FALSE);
callbacks.new_sample = callback_function_sample_fallback;
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks, &counter, NULL);
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
list = create_buffer_list ();
fail_unless (gst_pad_push_list (mysrcpad, list) == GST_FLOW_OK);
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fail_unless_equals_int (counter, 3);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_buffer_list_support)
{
GstElement *sink;
GstBufferList *list;
GstAppSinkCallbacks callbacks = { NULL };
gint counter = 0;
sink = setup_appsink ();
/* enable buffer list support */
g_object_set (sink, "buffer-list", TRUE, NULL);
callbacks.new_sample = callback_function_sample;
gst_app_sink_set_callbacks (GST_APP_SINK (sink), &callbacks, &counter, NULL);
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
list = create_buffer_list ();
fail_unless (gst_pad_push_list (mysrcpad, list) == GST_FLOW_OK);
fail_unless_equals_int (counter, 1);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_buffer_list_fallback_signal)
{
GstElement *sink;
GstBufferList *list;
gint counter = 0;
sink = setup_appsink ();
/* C calling convention to the rescue.. */
g_signal_connect (sink, "new-sample",
G_CALLBACK (callback_function_sample_fallback), &counter);
g_object_set (sink, "emit-signals", TRUE, NULL);
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
list = create_buffer_list ();
fail_unless (gst_pad_push_list (mysrcpad, list) == GST_FLOW_OK);
fail_unless_equals_int (counter, 3);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_buffer_list_signal)
{
GstElement *sink;
GstBufferList *list;
gint counter = 0;
sink = setup_appsink ();
/* enable buffer list support */
g_object_set (sink, "buffer-list", TRUE, NULL);
/* C calling convention to the rescue.. */
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g_signal_connect (sink, "new-sample", G_CALLBACK (callback_function_sample),
&counter);
g_object_set (sink, "emit-signals", TRUE, NULL);
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
list = create_buffer_list ();
fail_unless (gst_pad_push_list (mysrcpad, list) == GST_FLOW_OK);
fail_unless_equals_int (counter, 1);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_segment)
{
GstElement *sink;
GstSegment segment;
GstBuffer *buffer;
GstSample *pulled_preroll;
GstSample *pulled_sample;
sink = setup_appsink ();
gst_segment_init (&segment, GST_FORMAT_TIME);
segment.start = 2 * GST_SECOND;
fail_unless (gst_pad_push_event (mysrcpad, gst_event_new_segment (&segment)));
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);
g_signal_emit_by_name (sink, "pull-preroll", &pulled_preroll);
fail_unless (gst_segment_is_equal (&segment,
gst_sample_get_segment (pulled_preroll)));
gst_sample_unref (pulled_preroll);
g_signal_emit_by_name (sink, "pull-sample", &pulled_sample);
fail_unless (gst_segment_is_equal (&segment,
gst_sample_get_segment (pulled_sample)));
gst_sample_unref (pulled_sample);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_pull_with_timeout)
{
GstElement *sink;
GstBuffer *buffer;
GstSample *s;
guint64 t1, tdiff;
sink = setup_appsink ();
ASSERT_SET_STATE (sink, GST_STATE_PLAYING, GST_STATE_CHANGE_ASYNC);
/* Check that it actually waits for a bit */
t1 = gst_util_get_timestamp ();
s = gst_app_sink_try_pull_preroll (GST_APP_SINK (sink), GST_SECOND / 20);
tdiff = gst_util_get_timestamp () - t1;
GST_LOG ("tdiff: %" GST_TIME_FORMAT, GST_TIME_ARGS (tdiff));
fail_unless (s == NULL);
fail_unless (tdiff > (GST_SECOND / (20 * 2)));
buffer = gst_buffer_new_and_alloc (4);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s = gst_app_sink_try_pull_preroll (GST_APP_SINK (sink), GST_SECOND / 20);
fail_unless (s != NULL);
gst_sample_unref (s);
s = gst_app_sink_try_pull_sample (GST_APP_SINK (sink), 500 * GST_SECOND);
fail_unless (s != NULL);
gst_sample_unref (s);
/* No waiting */
s = gst_app_sink_try_pull_sample (GST_APP_SINK (sink), 0);
fail_unless (s == NULL);
/* Check that it actually waits for a bit */
t1 = gst_util_get_timestamp ();
s = gst_app_sink_try_pull_sample (GST_APP_SINK (sink), GST_SECOND / 20);
tdiff = gst_util_get_timestamp () - t1;
GST_LOG ("tdiff: %" GST_TIME_FORMAT, GST_TIME_ARGS (tdiff));
fail_unless (s == NULL);
fail_unless (tdiff > (GST_SECOND / (20 * 2)));
/* No waiting, with buffer pending */
buffer = gst_buffer_new_and_alloc (5);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s = gst_app_sink_try_pull_sample (GST_APP_SINK (sink), 0);
fail_unless (s != NULL);
gst_sample_unref (s);
/* With timeout, with buffer pending */
buffer = gst_buffer_new_and_alloc (6);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
s = gst_app_sink_try_pull_sample (GST_APP_SINK (sink), GST_SECOND / 20);
fail_unless (s != NULL);
gst_sample_unref (s);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_pull_preroll)
{
GstElement *sink = NULL;
GstBuffer *buffer = NULL;
GstSample *pulled_preroll = NULL;
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);
pulled_preroll = gst_app_sink_pull_preroll (GST_APP_SINK (sink));
fail_unless (pulled_preroll);
gst_sample_unref (pulled_preroll);
fail_if (gst_app_sink_try_pull_preroll (GST_APP_SINK (sink), 0));
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
GST_START_TEST (test_do_not_care_preroll)
{
GstElement *sink = NULL;
GstBuffer *buffer = NULL;
GstSample *pulled_sample = NULL;
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);
pulled_sample = gst_app_sink_pull_sample (GST_APP_SINK (sink));
fail_unless (pulled_sample);
gst_sample_unref (pulled_sample);
fail_if (gst_app_sink_try_pull_preroll (GST_APP_SINK (sink), 0));
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
GST_END_TEST;
typedef struct
{
GMutex mutex;
GCond cond;
GstAppSink *appsink;
gboolean check;
} TestQueryDrainContext;
#define TEST_QUERY_DRAIN_CONTEXT_INIT { { 0, }, }
static gpointer
my_app_thread (TestQueryDrainContext * ctx)
{
GstSample *pulled_preroll = NULL;
GstSample *pulled_sample = NULL;
/* Wait for the query to reach appsink. */
g_mutex_lock (&ctx->mutex);
while (!ctx->check)
g_cond_wait (&ctx->cond, &ctx->mutex);
g_mutex_unlock (&ctx->mutex);
pulled_preroll = gst_app_sink_pull_preroll (ctx->appsink);
fail_unless (pulled_preroll);
gst_sample_unref (pulled_preroll);
pulled_sample = gst_app_sink_pull_sample (ctx->appsink);
fail_unless (pulled_sample);
gst_sample_unref (pulled_sample);
pulled_sample = gst_app_sink_pull_sample (ctx->appsink);
fail_unless (pulled_sample);
gst_sample_unref (pulled_sample);
return NULL;
}
static GstPadProbeReturn
query_handler (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstQuery *query = GST_PAD_PROBE_INFO_QUERY (info);
TestQueryDrainContext *ctx = (TestQueryDrainContext *) user_data;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DRAIN:
{
if (GST_PAD_PROBE_INFO_TYPE (info) & GST_PAD_PROBE_TYPE_PUSH) {
g_mutex_lock (&ctx->mutex);
ctx->check = TRUE;
g_cond_signal (&ctx->cond);
g_mutex_unlock (&ctx->mutex);
} else if (GST_PAD_PROBE_INFO_TYPE (info) & GST_PAD_PROBE_TYPE_PULL) {
/* Check that there is no pending buffers when drain query is done. */
fail_if (gst_app_sink_try_pull_preroll (ctx->appsink, 0));
fail_if (gst_app_sink_try_pull_sample (ctx->appsink, 0));
}
break;
}
default:
break;
}
return GST_PAD_PROBE_OK;
}
GST_START_TEST (test_query_drain)
{
GstElement *sink = NULL;
GstBuffer *buffer = NULL;
GstPad *sinkpad = NULL;
GThread *thread = NULL;
GstQuery *query = NULL;
TestQueryDrainContext ctx = TEST_QUERY_DRAIN_CONTEXT_INIT;
sink = setup_appsink ();
g_mutex_init (&ctx.mutex);
g_cond_init (&ctx.cond);
ctx.appsink = GST_APP_SINK (sink);
ctx.check = FALSE;
sinkpad = gst_element_get_static_pad (sink, "sink");
gst_pad_add_probe (sinkpad, GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM,
query_handler, (gpointer) & ctx, NULL);
gst_object_unref (sinkpad);
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);
buffer = gst_buffer_new_and_alloc (4);
fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
thread = g_thread_new ("appthread", (GThreadFunc) my_app_thread, &ctx);
fail_unless (thread != NULL);
query = gst_query_new_drain ();
fail_unless (gst_pad_peer_query (mysrcpad, query));
gst_query_unref (query);
g_thread_join (thread);
g_mutex_clear (&ctx.mutex);
g_cond_clear (&ctx.cond);
ASSERT_SET_STATE (sink, GST_STATE_NULL, GST_STATE_CHANGE_SUCCESS);
cleanup_appsink (sink);
}
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)
{
Suite *s = suite_create ("appsink");
TCase *tc_chain = tcase_create ("general");
suite_add_tcase (s, tc_chain);
tcase_add_test (tc_chain, test_non_clients);
tcase_add_test (tc_chain, test_handoff_callback);
tcase_add_test (tc_chain, test_notify0);
tcase_add_test (tc_chain, test_notify1);
tcase_add_test (tc_chain, test_buffer_list_fallback);
tcase_add_test (tc_chain, test_buffer_list_support);
tcase_add_test (tc_chain, test_buffer_list_fallback_signal);
tcase_add_test (tc_chain, test_buffer_list_signal);
tcase_add_test (tc_chain, test_segment);
tcase_add_test (tc_chain, test_pull_with_timeout);
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;
}
GST_CHECK_MAIN (appsink);