static void decompressCb( void *decompressionTrackingRefCon,
			  OSStatus result,
			  ICMDecompressionTrackingFlags decompressionTrackingFlags,
			  CVPixelBufferRef pixelBuffer,
			  TimeValue64 displayTime,
			  TimeValue64 displayDuration,
			  ICMValidTimeFlags validTimeFlags,
			  void *reserved,
			  void *sourceFrameRefCon )
{
  MacOSXVideoDecoder * macosx;
  GstBuffer *origbuf = (GstBuffer *) sourceFrameRefCon;

  macosx = (MacOSXVideoDecoder *) decompressionTrackingRefCon;

  GST_LOG_OBJECT (macosx, "result:%d, flags:0x%x, pixelBuffer:%p, displayTime:%lld, displayDuration:%lld",
		  result, decompressionTrackingFlags, pixelBuffer, displayTime, displayDuration);

  if (decompressionTrackingFlags & kICMDecompressionTracking_ReleaseSourceData) {
    GST_LOG ("removing previous buffer : %p", origbuf);
    gst_buffer_unref (origbuf);
  }
  if ((decompressionTrackingFlags & kICMDecompressionTracking_EmittingFrame) && pixelBuffer) {
    gpointer addr;
    GstBuffer *outbuf;
    size_t size = CVPixelBufferGetDataSize(pixelBuffer);

    /* allocate buffer */
    macosx->lastret = gst_pad_alloc_buffer (macosx->srcpad, GST_BUFFER_OFFSET_NONE,
					    size, GST_PAD_CAPS (macosx->srcpad),
					    &outbuf);
    if (G_UNLIKELY (macosx->lastret != GST_FLOW_OK)) {
      GST_LOG ("gst_pad_alloc_buffer() returned %s", gst_flow_get_name (macosx->lastret));
      goto beach;
    }

    CVPixelBufferRetain (pixelBuffer);
    if (CVPixelBufferLockBaseAddress (pixelBuffer, 0))
      GST_WARNING ("Couldn't lock base adress on pixel buffer !");
    addr = CVPixelBufferGetBaseAddress(pixelBuffer);

    /* copy data */
    GST_LOG ("copying data in buffer");

    g_memmove (GST_BUFFER_DATA (outbuf), addr, size);

    GST_LOG ("Releasing pixelbuffer");
    CVPixelBufferUnlockBaseAddress (pixelBuffer, 0);
    CVPixelBufferRelease (pixelBuffer);

    /* Set proper timestamp ! */
    gst_buffer_set_caps (outbuf, GST_PAD_CAPS (macosx->srcpad));
    GST_BUFFER_TIMESTAMP (outbuf) = displayTime;
    GST_BUFFER_DURATION (outbuf) = displayDuration;
    GST_BUFFER_SIZE (outbuf) = macosx->outsize;

    /* push buffer */
    GST_LOG ("Pushing buffer out !");
    macosx->lastret = gst_pad_push (macosx->srcpad, outbuf);

  } else {
    macosx->lastret = GST_FLOW_OK;
  }

 beach:
  return;
}