CURLOPT\_INTERLEAVEDATA(3) Library Functions Manual CURLOPT\_INTERLEAVEDATA(3)

# [NAME](#NAME)

CURLOPT\_INTERLEAVEDATA - pointer passed to RTSP interleave callback

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERLEAVEDATA, void *pointer);
```

# [DESCRIPTION](#DESCRIPTION)

This is the userdata *pointer* that is passed to [*CURLOPT\_INTERLEAVEFUNCTION(3)*](/man/os/curl/CURLOPT_INTERLEAVEFUNCTION.3) when interleaved RTP data is received. If the interleave function callback is not set, this pointer is not used anywhere.

# [DEFAULT](#DEFAULT)

NULL

# [PROTOCOLS](#PROTOCOLS)

This functionality affects rtsp only

# [EXAMPLE](#EXAMPLE)

```
struct local {


  void *custom;
};
static size_t rtp_write(void *ptr, size_t size, size_t nmemb, void *userp)
{


  struct local *l = userp;


  printf("my pointer: %p\n", l->custom);


  /* take care of the packet in 'ptr', then return... */


  return size * nmemb;
}
int main(void)
{


  struct local rtp_data;


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_easy_setopt(curl, CURLOPT_INTERLEAVEFUNCTION, rtp_write);


    curl_easy_setopt(curl, CURLOPT_INTERLEAVEDATA, &rtp_data);


    result = curl_easy_perform(curl);


    curl_easy_cleanup(curl);


  }
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.20.0

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_setopt(3)*](/man/os/curl/curl_easy_setopt.3) returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see [*libcurl-errors(3)*](/man/os/curl/libcurl-errors.3).

# [SEE ALSO](#SEE_ALSO)

[**CURLOPT\_INTERLEAVEFUNCTION**(3)](/man/os/curl/CURLOPT_INTERLEAVEFUNCTION.3), [**CURLOPT\_RTSP\_REQUEST**(3)](/man/os/curl/CURLOPT_RTSP_REQUEST.3)

2026-10-31 libcurl

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Document: CURLOPT_INTERLEAVEDATA(3) from curl 8.23.0-r3 (Chainguard OS)
Source: https://github.com/curl/curl.git