v4l2src: add a simple test case for device probing

configure.ac

@@ -1112,6 +1112,7 @@ tests/examples/equalizer/Makefile
 tests/examples/level/Makefile
 tests/examples/rtp/Makefile
 tests/examples/spectrum/Makefile
+tests/examples/v4l2/Makefile
 tests/files/Makefile
 tests/icles/Makefile
 gconf/Makefile

tests/examples/Makefile.am

@@ -1,3 +1,3 @@
-SUBDIRS = audiofx equalizer level rtp spectrum
+SUBDIRS = audiofx equalizer level rtp spectrum v4l2
 
-DIST_SUBDIRS = audiofx equalizer level rtp spectrum
+DIST_SUBDIRS = audiofx equalizer level rtp spectrum v4l2

tests/examples/v4l2/Makefile.am

@@ -0,0 +1,6 @@
+noinst_PROGRAMS = probe
+
+probe_SOURCES = probe.c
+probe_CFLAGS  = $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS)
+probe_LDFLAGS = $(GST_BASE_LIBS) $(GST_LIBS) $(GST_PLUGINS_BASE_LIBS) -lgstinterfaces-0.10
+

tests/examples/v4l2/probe.c

@@ -0,0 +1,85 @@
+/* GStreamer
+ * Copyright (C) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <gst/gst.h>
+#include <gst/interfaces/propertyprobe.h>
+
+int
+main (int argc, char *argv[])
+{
+  GstElement *src, *sink;
+  GstElement *bin;
+  GstPropertyProbe *probe = NULL;
+  const GParamSpec *pspec = NULL;
+  GValueArray *array = NULL;
+  gint i, ret;
+  GValue *value;
+  const gchar *device;
+  gchar *name;
+  guint flags;
+
+  gst_init (&argc, &argv);
+
+  bin = gst_pipeline_new ("pipeline");
+  g_assert (bin);
+
+  src = gst_element_factory_make ("v4l2src", "v4l2_source");
+  g_assert (src);
+  sink = gst_element_factory_make ("fakesink", "fake_sink");
+  g_assert (sink);
+
+  /* add objects to the main pipeline */
+  gst_bin_add_many (GST_BIN (bin), src, sink, NULL);
+  /* link the elements */
+  gst_element_link_many (src, sink, NULL);
+
+  /* probe devices */
+  g_print ("Probing devices with propertyprobe...\n");
+  probe = GST_PROPERTY_PROBE (src);
+  pspec = gst_property_probe_get_property (probe, "device");
+  array = gst_property_probe_probe_and_get_values (probe, pspec);
+
+  if (!array) {
+    g_print ("No device found\n");
+    exit (1);
+  }
+
+  for (i = 0; i < array->n_values; i++) {
+    value = g_value_array_get_nth (array, i);
+    device = g_value_get_string (value);
+    g_print ("Device: %s\n", device);
+    g_object_set_property (G_OBJECT (src), "device", value);
+    gst_element_set_state (bin, GST_STATE_READY);
+    ret = gst_element_get_state (bin, NULL, NULL, 10 * GST_SECOND);
+    if (ret != GST_STATE_CHANGE_SUCCESS) {
+      g_print ("Couldn't set STATE_READY\n");
+      continue;
+    }
+    g_object_get (G_OBJECT (src), "device-name", &name, NULL);
+    g_print ("Name: %s\n", name);
+    g_free (name);
+    g_object_get (G_OBJECT (src), "flags", &flags, NULL);
+    g_print ("Flags: 0x%08X\n", flags);
+    gst_element_set_state (bin, GST_STATE_NULL);
+    g_print ("\n");
+  }
+
+  exit (0);
+}