publish method Null safety

Future<String> publish(
  1. String? sdp,
  2. {Map<String, dynamic>? options}
)

Establish WebRTC connection with Millicast Server as Publisher role.

sdp - The SDP information created by your offer. options - Signaling Publish Options. Returns Future object which represents the SDP command response.

var response = await millicastSignaling.publish(sdp, {codec: 'h264'})

Implementation

Future<String> publish(String? sdp, {Map<String, dynamic>? options}) async {
  _logger.i('Starting publishing to streamName: '
      '$streamName, codec: ${options?['codec']}');
  _logger.d('Publishing local description: $sdp');
  if (options != null) {
    if (!videoCodec.containsValue(options['codec'])) {
      _logger.e('Invalid codec. Possible values are: $videoCodec');
      throw Exception('Invalid codec. Possible values are: $videoCodec');
    }
    List<String?> codecs = (await NativeChannel.supportedCodecs);
    if (!codecs.contains(options['codec'])) {
      options['codec'] = codecs[0];
      _logger
          .w('Codec not supported by this device. Fallback to: ${codecs[0]}');
    }
    if (options['codec'] == videoCodec['AV1']) {
      sdp = SdpParser.adaptCodecName(sdp, 'AV1X', videoCodec['AV1']!);
    }
  }
  Map data = {
    'name': streamName,
    'sdp': sdp,
    'codec': options?['codec'],
    'sourceId': options?['sourceId']
  };
  if (options?['record'] != null) {
    data['record'] = options?['record'];
  }
  if (options?['events'] != null) {
    data['events'] = options?['events'];
  }
  try {
    await connect();
    _logger.i('Sending publish command');
    var result = await transactionManager?.cmd('publish', data);
    return result['data']['sdp'];
  } catch (e) {
    _logger.e('Error sending publish command, error: $e');
    throw Exception(e);
  }
}