/**
* gst_rtp_buffer_allocate_data:
* @buffer: a #GstBuffer
* @payload_len: the length of the payload
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Allocate enough data in @buffer to hold an RTP packet with @csrc_count CSRCs,
* a payload length of @payload_len and padding of @pad_len.
* MALLOCDATA of @buffer will be overwritten and will not be freed.
* All other RTP header fields will be set to 0/FALSE.
*/
void
gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
guint8 pad_len, guint8 csrc_count)
{
guint len;
guint8 *data;
g_return_if_fail (csrc_count <= 15);
g_return_if_fail (GST_IS_BUFFER (buffer));
len = GST_RTP_HEADER_LEN + csrc_count * sizeof (guint32)
+ payload_len + pad_len;
data = g_malloc (len);
GST_BUFFER_MALLOCDATA (buffer) = data;
GST_BUFFER_DATA (buffer) = data;
GST_BUFFER_SIZE (buffer) = len;
/* fill in defaults */
GST_RTP_HEADER_VERSION (data) = GST_RTP_VERSION;
GST_RTP_HEADER_PADDING (data) = FALSE;
GST_RTP_HEADER_EXTENSION (data) = FALSE;
GST_RTP_HEADER_CSRC_COUNT (data) = csrc_count;
memset (GST_RTP_HEADER_CSRC_LIST_OFFSET (data, 0), 0,
csrc_count * sizeof (guint32));
GST_RTP_HEADER_MARKER (data) = FALSE;
GST_RTP_HEADER_PAYLOAD_TYPE (data) = 0;
GST_RTP_HEADER_SEQ (data) = 0;
GST_RTP_HEADER_TIMESTAMP (data) = 0;
GST_RTP_HEADER_SSRC (data) = 0;
}
static GstBufferListItem
set_seq_header (GstBuffer ** buffer, guint group, guint idx, guint16 * seq)
{
GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (*buffer)) = g_htons (*seq);
(*seq)++;
return GST_BUFFER_LIST_SKIP_GROUP;
}
EXPORT_C
#endif
void
gst_rtp_buffer_set_seq (GstBuffer * buffer, guint16 seq)
{
GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)) = g_htons (seq);
}
EXPORT_C
#endif
guint16
gst_rtp_buffer_get_seq (GstBuffer * buffer)
{
return g_ntohs (GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_list_get_seq:
* @list: the buffer list
*
* Get the sequence number of the first RTP packet in @list.
* All packets within @list have the same sequence number.
*
* Returns: The seq number
*
* Since: 0.10.24
*/
guint16
gst_rtp_buffer_list_get_seq (GstBufferList * list)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (list, 0, 0);
g_return_val_if_fail (buffer != NULL, 0);
return g_ntohl (GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)));
}
EXPORT_C
#endif
void
gst_rtp_buffer_set_seq (GstBuffer * buffer, guint16 seq)
{
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (GST_BUFFER_DATA (buffer) != NULL);
GST_RTP_HEADER_SEQ (buffer) = g_htons (seq);
}
EXPORT_C
#endif
guint16
gst_rtp_buffer_get_seq (GstBuffer * buffer)
{
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (GST_BUFFER_DATA (buffer) != NULL, 0);
return g_ntohs (GST_RTP_HEADER_SEQ (buffer));
}
/**
* gst_rtp_buffer_list_validate:
* @list: the buffer list to validate
*
* Check if all RTP packets in the @list are valid using validate_data().
* Use this function to validate an list before using the other functions in
* this module.
*
* Returns: TRUE if @list consists only of valid RTP packets.
*
* Since: 0.10.24
*/
gboolean
gst_rtp_buffer_list_validate (GstBufferList * list)
{
guint16 prev_seqnum = 0;
GstBufferListIterator *it;
guint i = 0;
g_return_val_if_fail (GST_IS_BUFFER_LIST (list), FALSE);
it = gst_buffer_list_iterate (list);
g_return_val_if_fail (it != NULL, FALSE);
/* iterate through all the RTP packets in the list */
while (gst_buffer_list_iterator_next_group (it)) {
GstBuffer *rtpbuf;
GstBuffer *paybuf;
guint8 *packet_header;
guint8 *packet_payload;
guint payload_size;
guint packet_size;
/* each group should consists of 2 buffers: one containing the RTP header
* and the other one the payload, FIXME, relax the requirement of only one
* payload buffer. */
if (gst_buffer_list_iterator_n_buffers (it) != 2)
goto invalid_list;
/* get the RTP header */
rtpbuf = gst_buffer_list_iterator_next (it);
packet_header = GST_BUFFER_DATA (rtpbuf);
if (packet_header == NULL)
goto invalid_list;
/* get the payload */
paybuf = gst_buffer_list_iterator_next (it);
packet_payload = GST_BUFFER_DATA (paybuf);
if (packet_payload == NULL) {
goto invalid_list;
}
payload_size = GST_BUFFER_SIZE (paybuf);
if (payload_size == 0) {
goto invalid_list;
}
/* the size of the RTP packet within the current group */
packet_size = GST_BUFFER_SIZE (rtpbuf) + payload_size;
/* check the sequence number */
if (G_UNLIKELY (i == 0)) {
prev_seqnum = g_ntohs (GST_RTP_HEADER_SEQ (packet_header));
i++;
} else {
if (++prev_seqnum != g_ntohs (GST_RTP_HEADER_SEQ (packet_header)))
goto invalid_list;
}
/* validate packet */
if (!validate_data (packet_header, packet_size, packet_payload,
payload_size)) {
goto invalid_list;
}
}
gst_buffer_list_iterator_free (it);
return TRUE;
/* ERRORS */
invalid_list:
{
gst_buffer_list_iterator_free (it);
return FALSE;
}
}
