ice_selected_pair.cpp File Reference

C++ implementation for retrieving selected ICE candidate pair. More...

Go to the source code of this file.

Functions
asciichat_error_t	ice_get_selected_pair_impl (webrtc_peer_connection_t *pc, ice_candidate_t *local_candidate, ice_candidate_t *remote_candidate)
	Get selected ICE candidate pair (C++ implementation)

Detailed Description

C++ implementation for retrieving selected ICE candidate pair.

Uses libdatachannel's C++ API to access selected candidate pair information which is not exposed in the C API.

Author

Zachary Fogg me@zf.nosp@m.o.gg

Date

January 2026

Definition in file ice_selected_pair.cpp.

Function Documentation

ice_get_selected_pair_impl()

asciichat_error_t ice_get_selected_pair_impl	(	webrtc_peer_connection_t *	pc,
		ice_candidate_t *	local_candidate,
		ice_candidate_t *	remote_candidate
	)

Get selected ICE candidate pair (C++ implementation)

This function uses libdatachannel's C++ API to retrieve the selected candidate pair, which is not available in the C API.

Definition at line 58 of file ice_selected_pair.cpp.

                                                                                {
  if (!pc) {
    return ERROR_INVALID_PARAM;
  }
 
  try {
    // Get the libdatachannel peer connection ID using helper function
    int rtc_id = webrtc_get_rtc_id(pc);
    if (rtc_id < 0) {
      return ERROR_INVALID_PARAM;
    }
 
    // Query selected candidate pair from libdatachannel
    // Note: This requires libdatachannel to have the selected candidate pair available
    char local_buf[512];
    char remote_buf[512];
 
    // Try to get the selected local candidate
    if (rtcGetSelectedCandidatePair(rtc_id, local_buf, sizeof(local_buf), remote_buf, sizeof(remote_buf)) < 0) {
      // No pair selected yet, or error accessing it
      return ERROR_INVALID_STATE;
    }
 
    // Parse local candidate if requested
    if (local_candidate) {
      std::string local_str(local_buf);
      asciichat_error_t err = parse_datachannel_candidate(local_str, local_candidate);
      if (err != ASCIICHAT_OK) {
        return err;
      }
    }
 
    // Parse remote candidate if requested
    if (remote_candidate) {
      std::string remote_str(remote_buf);
      asciichat_error_t err = parse_datachannel_candidate(remote_str, remote_candidate);
      if (err != ASCIICHAT_OK) {
        return err;
      }
    }
 
    return ASCIICHAT_OK;
 
  } catch (const std::exception &e) {
    return ERROR_NETWORK;
  } catch (...) {
    return ERROR_NETWORK;
  }
}

References webrtc_get_rtc_id().

Referenced by ice_get_selected_pair().