tests/examples/manual/playsink.c

/*** block a  from ../../../docs/manual/highlevel-playback.xml ***/
#include <gst/gst.h>

/*** block b  from ../../../docs/manual/highlevel-playback.xml ***/
static gboolean
my_bus_callback (GstBus     *bus,
		 GstMessage *message,
		 gpointer    data)
{
  GMainLoop *loop = data;

  switch (GST_MESSAGE_TYPE (message)) {
    case GST_MESSAGE_ERROR: {
      GError *err;
      gchar *debug;

      gst_message_parse_error (message, &err, &debug);
      g_print ("Error: %s\n", err->message);
      g_error_free (err);
      g_free (debug);

      g_main_loop_quit (loop);
      break;
    }
    case GST_MESSAGE_EOS:
      /* end-of-stream */
      g_main_loop_quit (loop);
      break;
    default:
      /* unhandled message */
      break;
  }

  /* remove message from the queue */
  return TRUE;
}

/*** block c  from ../../../docs/manual/highlevel-playback.xml ***/
GstElement *pipeline, *sink;

static void
cb_pad_added (GstElement *dec,
	      GstPad     *pad,
	      gpointer    data)
{
  GstCaps *caps;
  GstStructure *str;
  const gchar *name;
  GstPadTemplate *templ;
  GstElementClass *klass;

  /* check media type */
  caps = gst_pad_query_caps (pad, NULL);
  str = gst_caps_get_structure (caps, 0);
  name = gst_structure_get_name (str);

  klass = GST_ELEMENT_GET_CLASS (sink);

  if (g_str_has_prefix (name, "audio")) {
    templ = gst_element_class_get_pad_template (klass, "audio_sink");
  } else if (g_str_has_prefix (name, "video")) {
    templ = gst_element_class_get_pad_template (klass, "video_sink");
  } else if (g_str_has_prefix (name, "text")) {
    templ = gst_element_class_get_pad_template (klass, "text_sink");
  } else {
    templ = NULL;
  }

  if (templ) {
    GstPad *sinkpad;

    sinkpad = gst_element_request_pad (sink, templ, NULL, NULL);

    if (!gst_pad_is_linked (sinkpad))
      gst_pad_link (pad, sinkpad);

    gst_object_unref (sinkpad);
  }
}

gint
main (gint   argc,
      gchar *argv[])
{
  GMainLoop *loop;
  GstElement *dec;
  GstBus *bus;

  /* init GStreamer */
  gst_init (&argc, &argv);
  loop = g_main_loop_new (NULL, FALSE);

  /* make sure we have input */
  if (argc != 2) {
    g_print ("Usage: %s <uri>\n", argv[0]);
    return -1;
  }

  /* setup */
  pipeline = gst_pipeline_new ("pipeline");

  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  gst_bus_add_watch (bus, my_bus_callback, loop);
  gst_object_unref (bus);

  dec = gst_element_factory_make ("uridecodebin", "source");
  g_object_set (G_OBJECT (dec), "uri", argv[1], NULL);
  g_signal_connect (dec, "pad-added", G_CALLBACK (cb_pad_added), NULL);

  /* create audio output */
  sink = gst_element_factory_make ("playsink", "sink");
  gst_util_set_object_arg (G_OBJECT (sink), "flags",  
      "soft-colorbalance+soft-volume+vis+text+audio+video");
  gst_bin_add_many (GST_BIN (pipeline), dec, sink, NULL);

  /* run */
  gst_element_set_state (pipeline, GST_STATE_PLAYING);
  g_main_loop_run (loop);

  /* cleanup */
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (GST_OBJECT (pipeline));

  return 0;
}