static gboolean
gst_irtsp_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
gint off;
if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < 4))
return FALSE;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffff0000,
0x24000000 + (IRTSPParse->channel_id << 16), 0, GST_BUFFER_SIZE (buf));
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
/* didn't find anything that looks like a sync word, skip */
if (off < 0) {
*skipsize = GST_BUFFER_SIZE (buf) - 3;
return FALSE;
}
/* possible frame header, but not at offset 0? skip bytes before sync */
if (off > 0) {
*skipsize = off;
return FALSE;
}
*framesize = GST_READ_UINT16_BE (GST_BUFFER_DATA (frame->buffer) + 2) + 4;
GST_LOG_OBJECT (parse, "got frame size %d", *framesize);
return TRUE;
}
static gboolean
gst_irtsp_parse_start (GstBaseParse * parse)
{
GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
GST_DEBUG_OBJECT (parse, "starting");
gst_irtsp_parse_reset (IRTSPParse);
return TRUE;
}
static void
gst_irtsp_parse_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (object);
switch (prop_id) {
case PROP_CHANNEL_ID:
g_value_set_int (value, IRTSPParse->channel_id);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_irtsp_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader;
gint off;
GstMapInfo map;
gboolean ret = FALSE;
guint framesize;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (G_UNLIKELY (map.size < 4))
goto exit;
gst_byte_reader_init (&reader, map.data, map.size);
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffff0000,
0x24000000 + (IRTSPParse->channel_id << 16), 0, map.size);
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
/* didn't find anything that looks like a sync word, skip */
if (off < 0) {
*skipsize = map.size - 3;
goto exit;
}
/* possible frame header, but not at offset 0? skip bytes before sync */
if (off > 0) {
*skipsize = off;
goto exit;
}
framesize = GST_READ_UINT16_BE (map.data + 2) + 4;
GST_LOG_OBJECT (parse, "got frame size %d", framesize);
ret = TRUE;
if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
GstCaps *caps;
caps = gst_caps_new_empty_simple ("application/x-rtp");
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
gst_caps_unref (caps);
}
exit:
gst_buffer_unmap (buf, &map);
if (ret && framesize <= map.size) {
/* HACK HACK skip header.
* could also ask baseparse to skip this,
* but that would give us a discontinuity for free
* which is a bit too much to have on all our packets */
frame->out_buffer = gst_buffer_copy (frame->buffer);
gst_buffer_resize (frame->out_buffer, 4, -1);
GST_BUFFER_FLAG_UNSET (frame->out_buffer, GST_BUFFER_FLAG_DISCONT);
return gst_base_parse_finish_frame (parse, frame, framesize);
}
return GST_FLOW_OK;
}
