gst_init (&argc, &argv);
gst_controller_init (&argc, &argv);
- // build pipeline
+ /* build pipeline */
bin = gst_pipeline_new ("pipeline");
clock = gst_pipeline_get_clock (GST_PIPELINE (bin));
src = gst_element_factory_make ("audiotestsrc", "gen_audio");
GST_WARNING ("can't link elements");
goto Error;
}
- // add a controller to the source
+
+ /* square wave
+ g_object_set (G_OBJECT(src), "wave", 1, NULL);
+ */
+
+ /* add a controller to the source */
if (!(ctrl = gst_controller_new (G_OBJECT (src), "freq", "volume", NULL))) {
GST_WARNING ("can't control source element");
goto Error;
}
- // set interpolation
+
+ /* set interpolation */
gst_controller_set_interpolation_mode (ctrl, "volume",
GST_INTERPOLATE_LINEAR);
gst_controller_set_interpolation_mode (ctrl, "freq", GST_INTERPOLATE_LINEAR);
- // set control values
+ /* set control values */
g_value_init (&vol, G_TYPE_DOUBLE);
g_value_set_double (&vol, 0.0);
gst_controller_set (ctrl, "volume", 0 * GST_SECOND, &vol);
g_value_set_double (&vol, 1.0);
gst_controller_set (ctrl, "volume", 5 * GST_SECOND, &vol);
- g_value_set_double (&vol, 440.0);
+ g_value_set_double (&vol, 220.0);
gst_controller_set (ctrl, "freq", 0 * GST_SECOND, &vol);
g_value_set_double (&vol, 3520.0);
gst_controller_set (ctrl, "freq", 3 * GST_SECOND, &vol);
- g_value_set_double (&vol, 880.0);
+ g_value_set_double (&vol, 440.0);
gst_controller_set (ctrl, "freq", 6 * GST_SECOND, &vol);
clock_id =
gst_clock_new_single_shot_id (clock,
gst_clock_get_time (clock) + (7 * GST_SECOND));
- // run for 7 seconds
+ /* run for 7 seconds */
if (gst_element_set_state (bin, GST_STATE_PLAYING)) {
if ((wait_ret = gst_clock_id_wait (clock_id, NULL)) != GST_CLOCK_OK) {
GST_WARNING ("clock_id_wait returned: %d", wait_ret);
}
gst_element_set_state (bin, GST_STATE_NULL);
}
- // cleanup
+
+ /* cleanup */
g_object_unref (G_OBJECT (ctrl));
- g_object_unref (G_OBJECT (clock));
- g_object_unref (G_OBJECT (bin));
+ gst_object_unref (G_OBJECT (clock));
+ gst_object_unref (G_OBJECT (bin));
res = 0;
Error:
return (res);