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23 .TH CURLOPT_INTERLEAVEFUNCTION 3 "September 15, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_INTERLEAVEFUNCTION \- callback function for RTSP interleaved data
29 #include <curl/curl.h>
31 size_t interleave_callback(void *ptr, size_t size, size_t nmemb,
34 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERLEAVEFUNCTION,
37 Pass a pointer to your callback function, which should match the prototype
40 This callback function gets called by libcurl as soon as it has received
41 interleaved RTP data. This function gets called for each $ block and therefore
42 contains exactly one upper-layer protocol unit (e.g. one RTP packet). Curl
43 writes the interleaved header as well as the included data for each call. The
44 first byte is always an ASCII dollar sign. The dollar sign is followed by a
45 one byte channel identifier and then a 2 byte integer length in network byte
46 order. See \fIRFC2326 Section 10.12\fP for more information on how RTP
47 interleaving behaves. If unset or set to NULL, curl will use the default write
50 Interleaved RTP poses some challenges for the client application. Since the
51 stream data is sharing the RTSP control connection, it is critical to service
52 the RTP in a timely fashion. If the RTP data is not handled quickly,
53 subsequent response processing may become unreasonably delayed and the
54 connection may close. The application may use \fICURL_RTSPREQ_RECEIVE\fP to
55 service RTP data when no requests are desired. If the application makes a
56 request, (e.g. \fICURL_RTSPREQ_PAUSE\fP) then the response handler will
57 process any pending RTP data before marking the request as finished.
59 The \fICURLOPT_WRITEDATA(3)\fP is passed in the \fIuserdata\fP argument in the
62 NULL, the interleave data is then passed to the regular write function:
63 \fICURLOPT_WRITEFUNCTION(3)\fP.
68 static size_t rtp_write(void *ptr, size_t size, size_t nmemb, void *user)
70 struct local *l = (struct local *)user;
71 /* take care of the packet in 'ptr', then return... */
75 struct local rtp_data;
76 curl_easy_setopt(curl, CURLOPT_INTERLEAVEFUNCTION, rtp_write);
77 curl_easy_setopt(curl, CURLOPT_INTERLEAVEDATA, &rtp_data);
83 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
85 .BR CURLOPT_INTERLEAVEDATA "(3), " CURLOPT_RTSP_REQUEST "(3), "