RTSP 消息拼装实例代码

时间：2023-03-08 16:40:13

整理了下之前文章提到的RTSP实例的代码，主要是拼装各类消息字段。

首先，抽取一个公共函数，用来根据消息类型，生成不同的format，供sprintf试用。

char * GetRTSPCmd( const char * szName)

{

	char *str = NULL;

	char const*  cmdFmt = NULL;

	if(!strcmp(szName, "OPTIONS"))

	{

		cmdFmt =

			"OPTIONS %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"%s"

			"%s"

#ifdef SUPPORT_REAL_RTSP

			REAL_OPTIONS_HEADERS

#endif

			"\r\n";

	}

	else if(!strcmp(szName, "ANNOUNCE"))

	{

		cmdFmt =

			"ANNOUNCE %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Content-Type: application/sdp\r\n"

			"%s"

			"Content-length: %d\r\n\r\n"

			"%s";

	}

	else if(!strcmp(szName, "PLAY"))

	{

		cmdFmt ="PLAY %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"%s"

			"%s"

			"%s"

			"%s"

			"\r\n";

	}

	else if(!strcmp(szName, "PAUSE"))

	{

		cmdFmt =

			"PAUSE %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"%s"

			"%s"

			"\r\n";

	}

	else if(!strcmp(szName, "RECORD"))

	{

		cmdFmt =

			"RECORD %s%s%s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"Range: npt=0-\r\n"

			"%s"

			"%s"

			"\r\n";

	}

	else if(!strcmp(szName, "SET_PARAMETER"))

	{

		cmdFmt =

			"SET_PARAMETER %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"%s"

			"%s"

			"Content-length: %d\r\n\r\n"

			"%s: %s\r\n";

	}

	else if(!strcmp(szName, "GET_PARAMETER"))

	{

		cmdFmt =

			"GET_PARAMETER %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"%s"

			"%s"

			"Content-type: text/parameters\r\n"

			"Content-length: %d\r\n\r\n"

			"%s\r\n";

	}

	else if(!strcmp(szName, "TEARDOWN"))

	{

		cmdFmt =

			"TEARDOWN %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Session: %s\r\n"

			"%s"

			"%s"

			"\r\n";

	}

	else if(!strcmp(szName, "DESCRIBE"))

	{

		cmdFmt =

			"DESCRIBE %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"%s"

			"%s"

			"%s"

#ifdef SUPPORT_REAL_RTSP

			REAL_DESCRIBE_HEADERS

#endif

			"\r\n";

	}

	else if(!strcmp(szName, "ANNOUNCE"))

	{

		cmdFmt =

			"ANNOUNCE %s RTSP/1.0\r\n"

			"CSeq: %d\r\n"

			"Content-Type: application/sdp\r\n"

			"%s"

			"Content-length: %d\r\n\r\n"

			"%s";

	}

	else if(!strcmp(szName, "SETUP"))

	{

		cmdFmt ="SETUP %s"

			"CSeq: %d\r\n"

			"%s"

			"%s"

			"%s"

			"%s"

			"\r\n";

	}

	str = (char*)cmdFmt;

	return str;

}

然后，针对每种消息类型，在做单独的拼装，下面主要介绍Client向Server发送的请求消息：

1.OPTION

#define  PP_NAME "User-Agent: rtsp client(v1.0)"

#define  PP_CRLF "\r\n"

char * GetOptionCmd( char *url )

{

	int nlen, iret;

	char *ss;

	char *s = GetRTSPCmd("OPTIONS");

	nlen = strlen(s);

	iret = nlen + strlen(url) + strlen(PP_NAME) + 200;

	ss = (char*)malloc(iret);

	sprintf(ss, s, url, 1, PP_NAME, PP_CRLF);

	return ss;

}

2.DESCRIBE

char * GetDescribeCmd( char *url )

{

	int nlen, iret;

	char *ss;

	char *s = GetRTSPCmd("DESCRIBE");

	nlen = strlen(s);

	iret = nlen + strlen(url) + strlen(PP_NAME) + 200;

	ss = (char*)malloc(iret);

	sprintf(ss, s, url, 2, PP_NAME, PP_CRLF, PP_CRLF);

	return ss;

}

3.SETUP

char * GetSetupCmd( char *url , int port1, int port2)

{

	int nlen, iret;

	char *ss;

	char *s = GetRTSPCmd("SETUP");

	nlen = strlen(s);

	iret = nlen + strlen(url) + strlen(PP_NAME) + 200;

	ss = (char*)malloc(iret);

	char buf[128] = {0};

	char buf2[128] = {0};

	if(port1 == 0)

		strcpy(buf, "\r\nTransport: RTP/AVP/TCP;unicast;interleaved=0-1");

	else

		sprintf(buf, "\r\nTransport: RTP/AVP;unicast;client_port=%d-%d", ntohs(port2), ntohs(port1));

	sprintf(buf2, "%s/track1 RTSP/1.0\r\n", url);

	sprintf(ss, s, buf2, 3,  PP_NAME, buf, PP_CRLF, PP_CRLF);

	return ss;

}

4.PLAY

char * GetPlayCmd( char *url , char *session, char *range)

{

	int nlen, iret;

	char *ss;

	char *s = GetRTSPCmd("PLAY");

	nlen = strlen(s);

	iret = nlen + strlen(url) + strlen(PP_NAME) + 200;

	ss = (char*)malloc(iret);

	//char buf[128] = {0};

	//sprintf(buf, "Session: %s\r\n", session);

	sprintf(ss, s, url, 4, session, range, PP_NAME, PP_CRLF, PP_CRLF);

	return ss;

}

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