Add the convert functions to the source pads of the video4linux and video4linux2...

Original commit message from CVS:
Add the convert functions to the source pads of the video4linux and video4linux2 source plugins

diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
index 6f10298..590a62b 100644 (file)
--- a/sys/v4l2/gstv4l2src.c
+++ b/sys/v4l2/gstv4l2src.c
@@ -56,9 +56,14 @@ static void                  gst_v4l2src_class_init          (GstV4l2SrcClass *klass);
 static void                    gst_v4l2src_init                (GstV4l2Src      *v4l2src);
 
 /* pad/buffer functions */
+static gboolean                        gst_v4l2src_srcconvert          (GstPad          *pad,
+                                                                GstFormat       src_format,
+                                                                gint64          src_value,
+                                                                GstFormat       *dest_format,
+                                                                gint64          *dest_value);
 static GstPadConnectReturn     gst_v4l2src_srcconnect          (GstPad          *pad,
                                                                 GstCaps         *caps);
-static GstBuffer *             gst_v4l2src_get                 (GstPad         *pad);
+static GstBuffer *             gst_v4l2src_get                 (GstPad          *pad);
 
 /* get/set params */
 static void                    gst_v4l2src_set_property        (GObject         *object,
@@ -170,6 +175,7 @@ gst_v4l2src_init (GstV4l2Src *v4l2src)
 
        gst_pad_set_get_function(v4l2src->srcpad, gst_v4l2src_get);
        gst_pad_set_connect_function(v4l2src->srcpad, gst_v4l2src_srcconnect);
+       gst_pad_set_convert_function (v4l2src->srcpad, gst_v4l2src_srcconvert);
 
        v4l2src->bufferpool = gst_buffer_pool_new(NULL, NULL,
                                        gst_v4l2src_buffer_new,
@@ -184,6 +190,64 @@ gst_v4l2src_init (GstV4l2Src *v4l2src)
 }
 
 
+static gboolean
+gst_v4l2src_srcconvert (GstPad    *pad,
+                        GstFormat  src_format,
+                        gint64     src_value,
+                        GstFormat *dest_format,
+                        gint64    *dest_value)
+{
+       GstV4l2Src *v4l2src;
+       gint norm;
+       struct v4l2_standard *std;
+       gdouble fps;
+
+       v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
+
+       if (!GST_V4L2_IS_OPEN(v4l2src))
+               return FALSE;
+
+       if (!gst_v4l2_get_norm(v4l2src, &norm))
+               return FALSE;
+
+       std = &((struct v4l2_enumstd *) g_list_nth_data(v4l2src->norms, norm))->std;
+       fps = std->framerate.numerator / std->framerate.denominator;
+
+       switch (src_format) {
+               case GST_FORMAT_TIME:
+                       switch (*dest_format) {
+                               case GST_FORMAT_DEFAULT:
+                                       *dest_format = GST_FORMAT_UNITS;
+                                       /* fall-through */
+                               case GST_FORMAT_UNITS:
+                                       *dest_value = src_value * fps / GST_SECOND;
+                                       break;
+                               default:
+                                       return FALSE;
+                       }
+                       break;
+
+               case GST_FORMAT_UNITS:
+                       switch (*dest_format) {
+                               case GST_FORMAT_DEFAULT:
+                                       *dest_format = GST_FORMAT_TIME;
+                                       /* fall-through */
+                               case GST_FORMAT_TIME:
+                                       *dest_value = src_value * GST_SECOND / fps;
+                                       break;
+                               default:
+                                       return FALSE;
+                       }
+                       break;
+
+               default:
+                       return FALSE;
+       }
+
+       return TRUE;
+}
+
+
 static GstCaps *
 gst_v4l2src_v4l2fourcc_to_caps (guint32  fourcc,
                                 gint     width,