get_csrc_count
Description:
Get the CSRC count of the RTP packet in buffer.
Parameters:
| this | 
           the RTP packet  | 
      
Returns:
| 
           the CSRC count of   | 
      
Get the CSRC count of the RTP packet in buffer.
| this | 
           the RTP packet  | 
      
| 
           the CSRC count of   |