static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass);
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static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad);
static void gst_videomixer_pad_get_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static gboolean gst_videomixer_src_event (GstPad * pad, GstEvent * event);
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static gboolean gst_videomixer_sink_event (GstPad * pad, GstEvent * event);
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static void gst_videomixer_sort_pads (GstVideoMixer * mix);
#define DEFAULT_PAD_ZORDER 0