/
audio.dart
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/
audio.dart
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// Copyright 2024 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import 'dart:async';
import 'package:collection/collection.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
import 'package:meta/meta.dart';
import '../../events.dart';
import '../../logger.dart';
import '../../options.dart';
import '../../stats/audio_source_stats.dart';
import '../../stats/stats.dart';
import '../../types/other.dart';
import '../audio_management.dart';
import '../options.dart';
import 'local.dart';
class LocalAudioTrack extends LocalTrack
with AudioTrack, LocalAudioManagementMixin {
// Options used for this track
@override
covariant AudioCaptureOptions currentOptions;
AudioPublishOptions? lastPublishOptions;
Future<void> setDeviceId(String deviceId) async {
if (currentOptions.deviceId == deviceId) {
return;
}
currentOptions = currentOptions.copyWith(deviceId: deviceId);
if (!muted) {
await restartTrack();
}
}
num? _currentBitrate;
get currentBitrate => _currentBitrate;
AudioSenderStats? prevStats;
@override
Future<bool> monitorStats() async {
if (sender == null || events.isDisposed || !isActive) {
_currentBitrate = 0;
return false;
}
try {
final stats = await getSenderStats();
if (stats != null && prevStats != null && sender != null) {
_currentBitrate = computeBitrateForSenderStats(stats, prevStats);
events.emit(AudioSenderStatsEvent(
stats: stats, currentBitrate: currentBitrate));
}
prevStats = stats;
} catch (e) {
logger.warning('failed to get sender stats: $e');
return false;
}
return true;
}
Future<AudioSenderStats?> getSenderStats() async {
if (sender == null) {
return null;
}
late List<rtc.StatsReport> stats;
try {
stats = await sender!.getStats();
} catch (e) {
rethrow;
}
AudioSenderStats? senderStats;
for (var v in stats) {
if (v.type == 'outbound-rtp') {
senderStats ??= AudioSenderStats(v.id, v.timestamp);
senderStats.packetsSent = getNumValFromReport(v.values, 'packetsSent');
senderStats.packetsLost = getNumValFromReport(v.values, 'packetsLost');
senderStats.bytesSent = getNumValFromReport(v.values, 'bytesSent');
senderStats.roundTripTime =
getNumValFromReport(v.values, 'roundTripTime');
senderStats.jitter = getNumValFromReport(v.values, 'jitter');
final c = stats.firstWhereOrNull((element) => element.type == 'codec');
if (c != null) {
senderStats.mimeType = getStringValFromReport(c.values, 'mimeType');
senderStats.payloadType =
getNumValFromReport(c.values, 'payloadType');
senderStats.channels = getNumValFromReport(c.values, 'channels');
senderStats.clockRate = getNumValFromReport(c.values, 'clockRate');
}
} else if (v.type == 'media-source') {
senderStats ??= AudioSenderStats(v.id, v.timestamp);
senderStats.audioSourceStats = AudioSourceStats.fromReport(v);
}
}
return senderStats;
}
// private constructor
@internal
LocalAudioTrack(
TrackSource source,
rtc.MediaStream stream,
rtc.MediaStreamTrack track,
this.currentOptions,
) : super(
TrackType.AUDIO,
source,
stream,
track,
);
/// Creates a new audio track from the default audio input device.
static Future<LocalAudioTrack> create([
AudioCaptureOptions? options,
]) async {
options ??= const AudioCaptureOptions();
final stream = await LocalTrack.createStream(options);
return LocalAudioTrack(
TrackSource.microphone,
stream,
stream.getAudioTracks().first,
options,
);
}
}