GstElement *pipe1, *pipe2, *psink, *psrc;
GstClock *clock;

pipe1 = gst_parse_launch ("audiotestsrc ! proxysink name=psink", NULL);
psink = gst_bin_get_by_name (GST_BIN (pipe1), "psink");

pipe2 = gst_parse_launch ("proxysrc name=psrc ! autoaudiosink", NULL);
psrc = gst_bin_get_by_name (GST_BIN (pipe2), "psrc");

// Connect the two pipelines
g_object_set (psrc, "proxysink", psink, NULL);

// Both pipelines must agree on the timing information or we'll get glitches
// or overruns/underruns. Ideally, we should tell pipe1 to use the same clock
// as pipe2, but since that will be set asynchronously to the audio clock, it
// is simpler and likely accurate enough to use the system clock for both
// pipelines. If no element in either pipeline will provide a clock, this
// is not needed.
clock = gst_system_clock_obtain ();
gst_pipeline_use_clock (GST_PIPELINE (pipe1), clock);
gst_pipeline_use_clock (GST_PIPELINE (pipe2), clock);
g_object_unref (clock);

// This is not really needed in this case since the pipelines are created and
// started at the same time. However, an application that dynamically
// generates pipelines must ensure that all the pipelines that will be
// connected together share the same base time.
gst_element_set_base_time (pipe1, 0);
gst_element_set_base_time (pipe2, 0);

gst_element_set_state (pipe1, GST_STATE_PLAYING);
gst_element_set_state (pipe2, GST_STATE_PLAYING);