rtp seq 校验

rtp rfc 文档链接

1. rtp 源 结构体信息

/*
 * Per-source state information
 */
 typedef struct {
   
   
 u_int16 max_seq; /* highest seq. number seen */
 u_int32 cycles; /* shifted count of seq. number cycles */
 u_int32 base_seq; /* base seq number */
 u_int32 bad_seq; /* last ’bad’ seq number + 1 */
 u_int32 probation; /* sequ. packets till source is valid */
 u_int32 received; /* packets received */
 u_int32 expected_prior; /* packet expected at last interval */
 u_int32 received_prior; /* packet received at last interval */
 u_int32 transit; /* relative trans time for prev pkt */
 u_int32 jitter; /* estimated jitter */
 /* ... */
 } source;

2. 初始化源

init_seq(s, seq);
s->max_seq = seq - 1;
s->probation = MIN_SEQUENTIAL;

3.