Unnamed

/* 
 * gcc -Wall -o probe probe.c `pkg-config --cflags --libs gstreamer-0.10`
 *
 */
#include <gst/gst.h>

int
main (int argc, char **argv)
{
  const GValue *val;
  GstElement *element;
  GstCaps *caps;
  GstPad *pad;

  gst_init (&argc, &argv);

  element = gst_element_factory_make ("alsasrc", "alsasrc");

  /* must set proper device to get precise caps */
  g_object_set (element, "device", "hw:0", NULL);

  /* open device (so caps are probed) */
  gst_element_set_state (element, GST_STATE_READY);
  pad = gst_element_get_pad (element, "src");
  caps = gst_pad_get_caps (pad);
  gst_object_unref (pad);
  
  val = gst_structure_get_value (gst_caps_get_structure (caps, 0), "rate");
  g_assert (val != NULL);

  if (G_VALUE_HOLDS_INT (val)) {
    g_print ("Supported sample rate = %d\n", g_value_get_int (val));
  } else if (GST_VALUE_HOLDS_INT_RANGE (val)) {
    g_print ("Supported sample rate = %d - %d\n",
        gst_value_get_int_range_min (val),
        gst_value_get_int_range_max (val));
  } else if (GST_VALUE_HOLDS_LIST (val)) {
    const GValue *listval;
    guint i, num;

    num = gst_value_list_get_size (val);
    for (i = 0; i < num; ++i) {
      listval = gst_value_list_get_value (val, i);
      g_print ("supported sample rate %02u/%02u = %d\n",
          i, num, g_value_get_int (listval));
    }
  }

  /* and get rid */
  gst_element_set_state (element, GST_STATE_NULL);
  gst_object_unref (element);

  return 0;
}