pad->discont = FALSE;
}
- ret = gst_pad_push (GST_PAD_CAST (pad), outbuf);
+ /* Handlers can provide empty GAP buffers to indicate that the parsed
+ * content was valid but that nothing meaningful needs to be outputted. In
+ * such cases we send out a GAP event instead */
+ if (GST_BUFFER_FLAG_IS_SET (outbuf, GST_BUFFER_FLAG_GAP) &&
+ gst_buffer_get_size (outbuf) == 0) {
+ GstEvent *gap = gst_event_new_gap (GST_BUFFER_DTS (outbuf),
+ GST_BUFFER_DURATION (outbuf));
+ gst_buffer_unref (outbuf);
+ GST_DEBUG_OBJECT (pad,
+ "Replacing empty gap buffer with gap event %" GST_PTR_FORMAT, gap);
+ gst_pad_push_event (GST_PAD_CAST (pad), gap);
+ } else {
+ ret = gst_pad_push (GST_PAD_CAST (pad), outbuf);
+ }
outbuf = NULL;
ret = gst_flow_combiner_update_flow (demux->flowcombiner, ret);
GST_LOG_OBJECT (demux, "combined return %s", gst_flow_get_name (ret));
return GST_FLOW_ERROR;
}
- if (gst_buffer_get_size (buffer) < 18) {
+ if (gst_buffer_get_size (buffer) < 2) {
GST_ERROR ("Invalid VANC essence element size");
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
gst_byte_reader_init (&reader, map.data, map.size);
num_packets = gst_byte_reader_get_uint16_be_unchecked (&reader);
+ if (num_packets == 0) {
+ /* SMPTE 436-1:2013 5.5 The Number of VI Lines or ANC Packets Property
+ *
+ * One of the properties in the VI Element is the “Number of Lines” which is
+ * the number of the VI lines contained in this VI Element. This number can
+ * be zero if the current VI Element does not have any VI lines in the
+ * payload space. This capability can be used so every Content Package in a
+ * file can have a VI Element even if the video stream does not have VI
+ * lines with every frame (or field.)
+ *
+ * The same scheme can be used for ANC packets.
+ */
+
+ *outbuf = gst_buffer_new ();
+ GST_BUFFER_FLAG_SET (*outbuf, GST_BUFFER_FLAG_GAP);
+ ret = GST_FLOW_OK;
+ goto out;
+ }
for (i = 0; i < num_packets; i++) {
G_GNUC_UNUSED guint16 line_num;
G_GNUC_UNUSED guint8 wrapping_type;