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。
[cpp]
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;
}
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";
}
e