3 * unit testing helper lib
5 * Copyright (C) 2006 Andy Wingo <wingo at pobox.com>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
24 * SECTION:gstcheckbufferstraw
25 * @title: GstBufferStraw
26 * @short_description: Buffer interception code for GStreamer unit tests
28 * These macros and functions are for internal use of the unit tests found
29 * inside the 'check' directories of various GStreamer packages.
32 #include "gstbufferstraw.h"
36 static GstBuffer *buf = NULL;
39 /* called for every buffer. Waits until the global "buf" variable is unset,
40 * then sets it to the buffer received, and signals. */
41 static GstPadProbeReturn
42 buffer_probe (GstPad * pad, GstPadProbeInfo * info, gpointer unused)
44 GstBuffer *buffer = GST_PAD_PROBE_INFO_BUFFER (info);
49 g_cond_wait (&cond, &lock);
51 /* increase the refcount because we store it globally for others to use */
52 buf = gst_buffer_ref (buffer);
54 g_cond_signal (&cond);
56 g_mutex_unlock (&lock);
58 return GST_PAD_PROBE_OK;
62 * gst_buffer_straw_start_pipeline:
63 * @bin: the pipeline to run
64 * @pad: a pad on an element in @bin
66 * Sets up a pipeline for buffer sucking. This will allow you to call
67 * gst_buffer_straw_get_buffer() to access buffers as they pass over @pad.
69 * This function is normally used in unit tests that want to verify that a
70 * particular element is outputting correct buffers. For example, you would make
71 * a pipeline via gst_parse_launch(), pull out the pad you want to monitor, then
72 * call gst_buffer_straw_get_buffer() to get the buffers that pass through @pad.
73 * The pipeline will block until you have sucked off the buffers.
75 * This function will set the state of @bin to PLAYING; to clean up, be sure to
76 * call gst_buffer_straw_stop_pipeline().
78 * Note that you may not start two buffer straws at the same time. This function
79 * is intended for unit tests, not general API use. In fact it calls fail_if
80 * from libcheck, so you cannot use it outside unit tests.
83 gst_buffer_straw_start_pipeline (GstElement * bin, GstPad * pad)
85 GstStateChangeReturn ret;
87 id = gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_BUFFER,
88 buffer_probe, NULL, NULL);
90 ret = gst_element_set_state (bin, GST_STATE_PLAYING);
91 fail_if (ret == GST_STATE_CHANGE_FAILURE, "Could not start test pipeline");
92 if (ret == GST_STATE_CHANGE_ASYNC) {
93 ret = gst_element_get_state (bin, NULL, NULL, GST_CLOCK_TIME_NONE);
94 fail_if (ret != GST_STATE_CHANGE_SUCCESS, "Could not start test pipeline");
99 * gst_buffer_straw_get_buffer:
100 * @bin: the pipeline previously started via gst_buffer_straw_start_pipeline()
101 * @pad: the pad previously passed to gst_buffer_straw_start_pipeline()
103 * Get one buffer from @pad. Implemented via buffer probes. This function will
104 * block until the pipeline passes a buffer over @pad, so for robust behavior
105 * in unit tests, you need to use check's timeout to fail out in the case that a
106 * buffer never arrives.
108 * You must have previously called gst_buffer_straw_start_pipeline() on
109 * @pipeline and @pad.
111 * Returns: the captured #GstBuffer.
114 gst_buffer_straw_get_buffer (GstElement * bin, GstPad * pad)
118 g_mutex_lock (&lock);
121 g_cond_wait (&cond, &lock);
126 g_cond_signal (&cond);
128 g_mutex_unlock (&lock);
134 * gst_buffer_straw_stop_pipeline:
135 * @bin: the pipeline previously started via gst_buffer_straw_start_pipeline()
136 * @pad: the pad previously passed to gst_buffer_straw_start_pipeline()
138 * Set @bin to #GST_STATE_NULL and release resource allocated in
139 * gst_buffer_straw_start_pipeline().
141 * You must have previously called gst_buffer_straw_start_pipeline() on
142 * @pipeline and @pad.
145 gst_buffer_straw_stop_pipeline (GstElement * bin, GstPad * pad)
147 GstStateChangeReturn ret;
149 g_mutex_lock (&lock);
151 gst_buffer_unref (buf);
153 gst_pad_remove_probe (pad, (guint) id);
155 g_cond_signal (&cond);
156 g_mutex_unlock (&lock);
158 ret = gst_element_set_state (bin, GST_STATE_NULL);
159 fail_if (ret == GST_STATE_CHANGE_FAILURE, "Could not stop test pipeline");
160 if (ret == GST_STATE_CHANGE_ASYNC) {
161 ret = gst_element_get_state (bin, NULL, NULL, GST_CLOCK_TIME_NONE);
162 fail_if (ret != GST_STATE_CHANGE_SUCCESS, "Could not stop test pipeline");
165 g_mutex_lock (&lock);
167 gst_buffer_unref (buf);
169 g_mutex_unlock (&lock);