一个对RTCP按bit赋值的简单编程方法

#include <stdlib.h>
#include <stdio.h>
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
struct RTCPFBHeader
{
#ifdef RTP_BIG_ENDIAN
  uint8_t version:2;
  uint8_t padding:1;
  uint8_t fmt:5;
#else // little endian
  uint8_t fmt:5;
  uint8_t padding:1;
  uint8_t version:2;
#endif // RTP_BIG_ENDIAN
  uint8_t packettype;
  uint16_t length;
};
int main()
{
   char rtcpdata[]={0x83,0xcd,0x00,0x04,0x0e,0x5e,0xb3,0xe1,0x00,0x00,0x00,0x00,0x99,0x4a,0x2a,0x67};
   RTCPFBHeader *rtcphd = (RTCPFBHeader*)rtcpdata;
   RTCPFBHeader sheader = *rtcphd;
   printf("sheader.fmt=%d\n",sheader.fmt);
   return 1;
}