* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Tristan Leteurtre <tooney@via.ecp.fr>
* Laurent Aimar <fenrir@via.ecp.fr>
+ * Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
*
* Reviewed: 23 October 2003, Jean-Paul Saman <jpsaman@wxs.nl>
*
int i_mtu;
vlc_bool_t b_auto_mtu;
+
+ /* rtp only */
+ int i_sequence_number;
};
/*****************************************************************************
char *psz_parser, *psz_server_addr, *psz_bind_addr = "";
int i_bind_port, i_server_port = 0;
-
/* First set ipv4/ipv6 */
var_Create( p_access, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
var_Create( p_access, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
/* Update default_pts to a suitable value for udp access */
var_Create( p_access, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
+ /* Keep track of RTP sequence number */
+ p_sys->i_sequence_number = -1;
+
return VLC_SUCCESS;
}
int i_CSRC_count;
int i_payload_type;
int i_skip = 0;
-
+ int i_sequence_number = 0;
+
+ if( p_block == NULL )
+ return NULL;
+
if( p_block->i_buffer < RTP_HEADER_LEN )
goto trash;
i_rtp_version = ( p_block->p_buffer[0] & 0xC0 ) >> 6;
i_CSRC_count = ( p_block->p_buffer[0] & 0x0F );
i_payload_type = ( p_block->p_buffer[1] & 0x7F );
+ i_sequence_number = ( (p_block->p_buffer[2] << 8 ) + p_block->p_buffer[3] );
if ( i_rtp_version != 2 )
msg_Dbg( p_access, "RTP version is %u, should be 2", i_rtp_version );
/* Return the packet without the RTP header. */
p_block->i_buffer -= i_skip;
p_block->p_buffer += i_skip;
-
+
+#define RTP_SEQ_NUM_SIZE 65536
+ /* Detect RTP packet loss through tracking sequence numbers.
+ * See RFC 1889. */
+ if( p_access->p_sys->i_sequence_number == -1 )
+ p_access->p_sys->i_sequence_number = i_sequence_number;
+
+ if( ((p_access->p_sys->i_sequence_number + 1) % RTP_SEQ_NUM_SIZE) != i_sequence_number )
+ {
+ msg_Warn( p_access, "RTP packet(s) lost, expected sequence number %d got %d",
+ ((p_access->p_sys->i_sequence_number + 1) % RTP_SEQ_NUM_SIZE),
+ i_sequence_number );
+ if( i_payload_type == 33 )
+ {
+ /* Mark transport error in the first TS packet in the RTP stream. */
+ p_block->p_buffer[1] |= 0x80;
+ }
+ }
+ p_access->p_sys->i_sequence_number = i_sequence_number;
+#undef RTP_SEQ_NUM_SIZE
return p_block;
trash: