Thread: How can I read what data is in packet?

Hello,

I am working with video packets and know that MPEG4 packets begin with hex values 00 00 01 B6. I want to know if I am working with mp4 or not. How can I read information from packet to equal these values? m->payload gives only payload of packet without any headers.

Code:

 case IPQM_PACKET: 
 {
// take packets from buffer here
  ipq_packet_msg_t *m = ipq_get_packet(buf);

   int x;
  if(value in m->payload[x] == value) ??
{
  printf("MPEG packet");
x++;
}
 
 // and put them back here
status = ipq_set_verdict(h, m->packet_id,NF_ACCEPT, 0, NULL); 
     
  break;
     }

Full code: http://pastebin.com/raw.php?i=c2UgZkEj

MC

Hmm. As I work with Ubuntu and execute code (tried with few memory functions), I got error: "Segmentation fault (core dumped)" instantly. Any other suggestions?

Thank you Salem. I will try to do this.