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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2014, 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_INTERLEAVEFUNCTION 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_INTERLEAVEFUNCTION \- callback function for RTSP interleaved data
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+size_t interleave_callback(void *ptr, size_t size, size_t nmemb,
+                           void *userdata);
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERLEAVEFUNCTION,
+                          interleave_callback);
+.SH DESCRIPTION
+Pass a pointer to your callback function, which should match the prototype
+shown above.
+
+This callback function gets called by libcurl as soon as it has received
+interleaved RTP data. This function gets called for each $ block and therefore
+contains exactly one upper-layer protocol unit (e.g.  one RTP packet). Curl
+writes the interleaved header as well as the included data for each call. The
+first byte is always an ASCII dollar sign. The dollar sign is followed by a
+one byte channel identifier and then a 2 byte integer length in network byte
+order. See \fIRFC2326 Section 10.12\fP for more information on how RTP
+interleaving behaves. If unset or set to NULL, curl will use the default write
+function.
+
+Interleaved RTP poses some challenges for the client application. Since the
+stream data is sharing the RTSP control connection, it is critical to service
+the RTP in a timely fashion. If the RTP data is not handled quickly,
+subsequent response processing may become unreasonably delayed and the
+connection may close. The application may use \fICURL_RTSPREQ_RECEIVE\fP to
+service RTP data when no requests are desired. If the application makes a
+request, (e.g.  \fICURL_RTSPREQ_PAUSE\fP) then the response handler will
+process any pending RTP data before marking the request as finished.
+
+The \fICURLOPT_INTERLEAVEDATA(3)\fP is passed in the \fIuserdata\fP argument in
+the callback.
+.SH DEFAULT
+NULL, the interleave data is then passed to the regular write function:
+\fICURLOPT_WRITEFUNCTION(3)\fP.
+.SH PROTOCOLS
+RTSP
+.SH EXAMPLE
+.nf
+static size_t rtp_write(void *ptr, size_t size, size_t nmemb, void *user)
+{
+  struct local *l = (struct local *)user;
+  /* take care of the packet in 'ptr', then return... */
+  return size * nmemb;
+}
+{
+  struct local rtp_data;
+  curl_easy_setopt(curl, CURLOPT_INTERLEAVEFUNCTION, rtp_write);
+  curl_easy_setopt(curl, CURLOPT_INTERLEAVEDATA, &rtp_data);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.20.0
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_INTERLEAVEDATA "(3), " CURLOPT_RTSP_REQUEST "(3), "