Gstdtsdownmix : Porting gst_pad_alloc_buffer_and_set_caps to gst 1.0
Gstdtsdownmix : Porting gst_pad_alloc_buffer_and_set_caps to gst 1.0

Now we have already the streams avbl when downmix is on.
But still no audio sound. Because output is not ported to gst 1.0.

 Changes to be committed:
	modified:   gstdtsdownmix.c

christophecvr/gstreamer1.0-plugin-multibox-dvbmediasink,vitmod/gstreamer1.0-plugin-multibox-dvbmediasink,dazulrich/gstreamer1.0-plugin-multibox-dvbmediasink,sklnet/gstreamer1.0-plugin-multibox-dvbmediasink