On 4/27/2017 3:15 PM, channa reddy patil wrote:
> I have a question regarding if we can use curl to stream live audio
> captured from the MIC device.
> The problem I am facing is, the server is responding back immediately
> after the first chunk since it receives a end of chunk frame. Below
> are the steps I want to do
> 1. read MIC device some bytes to a buffer
> 2. Pass the buffer to curl to send it as chunked data
> 3. repeat step-1 again.
> Basically I do not want curl to send the end of with the transfer of
> the first buffer

If the server will wait then yes. You can pause the stream by returning
CURL_READFUNC_PAUSE [1] from your read function instead of 0. You can
use the progress callback [2][3][4] to check whether more uldata is
available and to unpause [5]. Note the progress function is called quite
frequently, at least once per second, so do as little processing there
as possible.

I actually can't find I've done this so I don't have a working sample
for you. I'm going to take a shot at how I think it would look but I'd
wait a bit in case someone more experienced in this area says it's wrong:

For each handle have a variable last_pause that tracks the handle's
pause state. Set it to 0 before calling perform on the handle, and then
during perform set it to the pause state you set with curl_easy_pause or
return from read function with CURL_READFUNC_PAUSE (last_pause |=
CURLPAUSE_SEND) or from write function with CURL_WRITEFUNC_PAUSE
(last_pause |= CURLPAUSE_RECV).

uldata_available represents some way you determine if upload data is
available.

Beginning of read function:
if(!userp->uldata_available) {
  userp->last_pause |= CURLPAUSE_SEND;
  return CURL_READFUNC_PAUSE;
}

Beginning of progress function:
if((userp->last_pause & CURLPAUSE_SEND) && userp->uldata_available) {
  userp->last_pause &= ~CURLPAUSE_SEND;
  res = curl_easy_pause(userp->handle, userp->last_pause);
  if(res != CURLE_OK)
    return (int)res;
}

[1]: https://curl.haxx.se/libcurl/c/CURLOPT_READFUNCTION.html
[2]: https://curl.haxx.se/libcurl/c/CURLOPT_XFERINFOFUNCTION.html
[3]: https://curl.haxx.se/libcurl/c/CURLOPT_NOPROGRESS.html
[4]: https://curl.haxx.se/libcurl/c/CURLOPT_XFERINFODATA.html
[5]: https://curl.haxx.se/libcurl/c/curl_easy_pause.html

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Received on 2017-04-28