关于rtp传输jpeg图片到vlc播放

byd yes 2015-01-06 11:08:19

遇到的问题
1.调用libjpeg库压缩原始数据yuyv，保存为图片jpg正常。
2.去掉jpeg的头，打包为rtp格式发送带vlc播放，完全没法正常显示。
3.传输没问题。之前我做的h.264用rtp很正常，所以感觉肯定是在jpeg头加入rtp上时有问题。但是研究了几天没有结果。希望哪个大婶帮解决哈。
压缩代码如下：

/*24bit转化为网络字节顺序*/

#define BIGENDIAN (htons(1) == 1)

unsigned int convert24bit(unsigned int bit24)

{

    if(BIGENDIAN == 1)/*大*/

        return bit24 & 0xffffff;

    else{//小

        return ( htonl(bit24) >> 8 );

    }

}

unsigned short SendFrame(unsigned short start_seq, unsigned long  ts,unsigned long ssrc,unsigned char *jpeg_data, int len,

                         unsigned short type,unsigned short typespec, int width, int height, unsigned short dri,

                         unsigned short q,unsigned char *lqt,unsigned char*cqt)

{

	rtp_hdr_t rtphdr;

	struct jpeghdr jpghdr;

	struct jpeghdr_rst rsthdr;

	struct jpeghdr_qtable qtblhdr;

	unsigned char packet_buf[PACKET_SIZE];

	unsigned char *ptr;

    unsigned int off = 0;

	int bytes_left = len;

	int seq = start_seq;

	int pkt_len, data_len;

	/* Initialize RTP header

	 */

	rtphdr.version = 2;

	rtphdr.p = 0;

	rtphdr.x = 0;

	rtphdr.cc = 0;

	rtphdr.m = 0;

	rtphdr.pt = RTP_PT_JPEG;

    rtphdr.seq = htons(seq_num);

	rtphdr.ts = htonl(convertToRTPTimestamp());

//	rtphdr.ts =htonl(ts);

	rtphdr.ssrc = htonl(ssrc);



	/* Initialize JPEG header

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 | Type-specific |              Fragment Offset                  |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |      Type     |       Q       |     Width     |     Height    |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

	 */

	jpghdr.tspec = typespec;/*解码没有用*/

	jpghdr.off = off;/*解码要用*/

	jpghdr.type = type | ((dri != 0) ? RTP_JPEG_RESTART : 0);//0

	jpghdr.q = q;

	jpghdr.width = width>>3;

	jpghdr.height = height>>3;



	/* Initialize DRI header

    //     0                   1                   2                   3

    //0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

    //+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    //|       Restart Interval        |F|L|       Restart Count       |

    //+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

	 */

	if (dri != 0) {

		rsthdr.dri = dri;

		rsthdr.f = 1;        /* This code does not align RIs */

		rsthdr.l = 1;

		rsthdr.count = 0x3fff;

	}



	/* Initialize quantization table header

	 */

	if (q >= 128) {

		qtblhdr.mbz = 0;

		qtblhdr.precision = 0; /* This code uses 8 bit tables only */

		qtblhdr.length = (128);  /* 2 64-byte tables */

	}



	while (bytes_left > 0) {

		ptr = packet_buf + RTP_HDR_SZ;

		memcpy(ptr, &jpghdr, sizeof(jpghdr));

      	ptr += sizeof(jpghdr);

	    

        rtphdr.m = 0;



        if (dri != 0) {

            memcpy(ptr, &rsthdr, sizeof(rsthdr));

            ptr += sizeof(rsthdr);

        }

        if (q >= 128 && jpghdr.off == 0) {/*发送的第一帧数据带上量化表*/

            memcpy(ptr, &qtblhdr, sizeof(qtblhdr));

            ptr += sizeof(qtblhdr);

            memcpy(ptr, lqt, 64);

            ptr += 64;

            memcpy(ptr, cqt, 64);

            ptr += 64;

        }



        data_len = PACKET_SIZE - (ptr - packet_buf);

        if (data_len >= bytes_left) {

            data_len = bytes_left;

            rtphdr.m = 1;

        }

        memcpy(packet_buf, &rtphdr, RTP_HDR_SZ);

        memcpy(ptr, jpeg_data + off, data_len);



        send(sockfd,packet_buf, (ptr - packet_buf) + data_len,0);

        off+=data_len;

        //printf("off = %d\n",off & 0xffffff);

        //jpghdr.off = htonl(off);

        jpghdr.off = convert24bit(off);/*协议说要转化为网络字节顺序，但是这个off是24bit ，不知道如何转化为网络字节顺序，如果是用htonl直接报断错误，rfc2435*/

        bytes_left -= data_len;

        rtphdr.seq = htons(seq_num++);

    }

    return rtphdr.seq;

}

其中seq_num在前面都定义了。Q因子不知道该怎么设置，量化表直接参考RFC2435文档写的。文档：www.5dmail.net/rfc/RFC2435.txt
现在的问题是：原始数据格式是yuyv422........设置type为64，vlc端用yuyv422解压缩，完全花瓶，人影都看不到。type设置为65，vlc端为yuv420解压，可以隐约看到人影,也是花屏。。。

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