v4l plugins: add open/close signals v4l2 plugins: add open/close signals move source format enumeration from v4l2elem...

Original commit message from CVS:
v4l plugins:
* add open/close signals

v4l2 plugins:
* add open/close signals
* move source format enumeration from v4l2element to v4l2src
* adapt to the final v4l2 API in kernel 2.5 (patches for 2.4 on http://bytesex.org/patches)
* small tweaks

sys/v4l/TODO

@@ -1,14 +1,14 @@
 TODO list (short term):
 =======================
 * fix clocking issues by using gst clock for v4lsrc and by using it
-    as a correction for v4lmjpegsrc/v4l2src
+    as a correction for v4lmjpegsrc/v4l2src (pause brokenness etc.)
 * v4lsrc/v4lmjpegsrc/v4l2src: fix interlacing (not handled at all...)
 
 TODO list (long term):
 ======================
 * v4lmpegsrc (*hint* MPEG card needed *hint*)
 * v4l2sink
-* BSD-videosrc (meteorsrc?)
+* BSD-videosrc (bktr)
 * color correction (brightness, hue, etc.)
 * gamma correction
 
@@ -17,6 +17,8 @@ Useful Documentation:
 MJPEG/V4L API : ./videodev_mjpeg.h
 Linux/V4L API : /usr/include/linux/videodev.h or
                 http://roadrunner.swansea.uk.linux.org/v4l.shtml
-Linux/V4L2 API: http://www.thedirks.org/v4l2/
+Linux/V4L2 API: /usr/include/linux/videodev2.h or
+                http://www.thedirks.org/v4l2/
+                (kernel patches: http://bytesex.org/patches/)
 BSD/Meteor API: /usr/include/machine/ioctl_meteor.h
 mjpegtools    : http://www.sourceforge.net/projects/mjpeg

sys/v4l/gstv4lelement.c

@@ -33,6 +33,8 @@ static GstElementDetails gst_v4lelement_details = {
 /* V4lElement signals and args */
 enum {
   /* FILL ME */
+  SIGNAL_OPEN,
+  SIGNAL_CLOSE,
   LAST_SIGNAL
 };
 
@@ -82,7 +84,7 @@ static gboolean              plugin_init                 (GModule            *mo
 
 
 static GstElementClass *parent_class = NULL;
-/*static guint gst_v4lelement_signals[LAST_SIGNAL] = { 0 }; */
+static guint gst_v4lelement_signals[LAST_SIGNAL] = { 0 };
 
 
 GType
@@ -205,6 +207,18 @@ gst_v4lelement_class_init (GstV4lElementClass *klass)
     g_param_spec_pointer("videowindow","videowindow","videowindow",
     G_PARAM_WRITABLE));
 
+  /* signals */
+  gst_v4lelement_signals[SIGNAL_OPEN] =
+    g_signal_new("open", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
+                 G_STRUCT_OFFSET(GstV4lElementClass, open),
+                 NULL, NULL, g_cclosure_marshal_VOID__STRING,
+                 G_TYPE_NONE, 1, G_TYPE_STRING);
+  gst_v4lelement_signals[SIGNAL_CLOSE] =
+    g_signal_new("close", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
+                 G_STRUCT_OFFSET(GstV4lElementClass, close),
+                 NULL, NULL, g_cclosure_marshal_VOID__STRING,
+                 G_TYPE_NONE, 1, G_TYPE_STRING);
+
   gobject_class->set_property = gst_v4lelement_set_property;
   gobject_class->get_property = gst_v4lelement_get_property;
 
@@ -532,6 +546,10 @@ gst_v4lelement_change_state (GstElement *element)
       if (!gst_v4l_open(v4lelement))
         return GST_STATE_FAILURE;
 
+      g_signal_emit(G_OBJECT(v4lelement),
+                    gst_v4lelement_signals[SIGNAL_OPEN], 0,
+                    v4lelement->videodev);
+
       /* now, sync options */
       if (v4lelement->norm >= VIDEO_MODE_PAL &&
           v4lelement->norm < VIDEO_MODE_AUTO &&
@@ -581,6 +599,10 @@ gst_v4lelement_change_state (GstElement *element)
     case GST_STATE_READY_TO_NULL:
       if (!gst_v4l_close(v4lelement))
         return GST_STATE_FAILURE;
+
+      g_signal_emit(G_OBJECT(v4lelement),
+                    gst_v4lelement_signals[SIGNAL_CLOSE], 0,
+                    v4lelement->videodev);
       break;
   }
 

sys/v4l/gstv4lelement.h

@@ -81,6 +81,12 @@ struct _GstV4lElement {
 
 struct _GstV4lElementClass {
   GstElementClass parent_class;
+
+  /* signals */
+  void (*open)  (GstElement  *element,
+                 const gchar *device);
+  void (*close) (GstElement  *element,
+                 const gchar *device);
 };
 
 GType gst_v4lelement_get_type(void);