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Diffstat (limited to 'docs/libcurl/opts/GNURLOPT_INTERLEAVEFUNCTION.3')
| -rw-r--r-- | docs/libcurl/opts/GNURLOPT_INTERLEAVEFUNCTION.3 | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/docs/libcurl/opts/GNURLOPT_INTERLEAVEFUNCTION.3 b/docs/libcurl/opts/GNURLOPT_INTERLEAVEFUNCTION.3 new file mode 100644 index 000000000..bd5995963 --- /dev/null +++ b/docs/libcurl/opts/GNURLOPT_INTERLEAVEFUNCTION.3 @@ -0,0 +1,84 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * 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 GNURLOPT_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 <gnurl/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), " |