gstreamer code

static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) {  GMainLoop *loop = (GMainLoop *) data;  switch (GST_MESSAGE_TYPE (msg)) {  case GST_MESSAGE_EOS:    g_print ("End-of-stream\n");    g_main_loop_quit (loop);    break;  case GST_MESSAGE_ERROR: {    gchar *debug;    GError *err;        gst_message_parse_error (msg, &err, &debug);    g_free (debug);        g_print ("Error: %s\n", err->message);    g_error_free (err);        g_main_loop_quit (loop);    break;  }  default:    break;  }  return TRUE;}int main(int argc, char **argv) {    gst_init(&argc, &argv);  GMainLoop *loop = g_main_loop_new(NULL, FALSE);    // audioconvert capabilities  GstCaps *caps_audio = gst_caps_new_simple("audio/x-raw-int",					    "rate", G_TYPE_INT, 44100,					    "channels", G_TYPE_INT, 2);    // pipeline and elements  GstElement *pipeline = gst_pipeline_new("mms to wav pipeline");  GstElement *mms_source = gst_element_factory_make("mmssrc", "mms-source");  GstElement *decodebin = gst_element_factory_make("decodebin", "generic decoder");    GstElement *audioconvert = gst_element_factory_make("audioconvert", "audio converter");  GstElement *audioresample = gst_element_factory_make("audioresample", "audio resampler");  GstElement *waveencoder = gst_element_factory_make("wavenc", "wav encoder");  GstElement *wav_sink = gst_element_factory_make("filesink", "wav-sink");  g_object_set(G_OBJECT(mms_source), "location", "mms://wm.npr.org/wm.npr.na-central/npr/fa/2006/01/20060113_fa_01.wma", NULL);  g_object_set(G_OBJECT(wav_sink), "location", "foo.wav", NULL);  GstBus *bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));  gst_bus_add_watch (bus, bus_call, loop);   gst_object_unref (bus);    gst_bin_add_many(GST_BIN(pipeline), mms_source, decodebin, audioconvert, audioresample, 		   waveencoder, wav_sink, NULL);  gst_element_link(mms_source, decodebin);  gst_element_link(decodebin, audioconvert);  gst_element_link(audioconvert, audioresample);  gst_element_link_filtered(audioresample, waveencoder, caps_audio);  gst_element_link(waveencoder, wav_sink);  g_print ("Setting to PLAYING\n");  gst_element_set_state (pipeline, GST_STATE_PLAYING);  g_print ("Running\n");  g_main_loop_run (loop);    // now get rid of these files  gst_object_unref(GST_OBJECT(pipeline));  return 1;}