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Add getBitrate() method for real-time bitrate monitoring (#189)
* feat: add getBitrate() method for real-time bitrate monitoring * test: add comprehensive tests for getBitrate() method * docs: add getBitrate() usage example and update changelog
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‎CHANGELOG.md‎

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@@ -1,12 +1,17 @@
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## 2.3.14
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- Added `getBitrate()` method for real-time bitrate monitoring (similar to janus.js getBitrate function)
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- Support for bitrate monitoring with and without mid parameter
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- Independent bitrate history tracking per stream
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## 2.3.13
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- downgrade to flutter_webrtc to version: 0.14.2 since 1.0.0 has issues with android seemingly unstable see [crashing on android](https://github.com/flutter-webrtc/flutter-webrtc/issues/1906)
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## 2.3.12
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- upgrade flutter_webrtc to version: 1.0.0
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## 2.3.11
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- feature: media constraints changes
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## 2.3.10
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- bugfix: change type of id to dynamic instead of int to support string ids
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- update:url for org
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- update:url for org
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## 2.3.9
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- bugfix: websocket session send refactored to use Completer instead of error prone firstWhere
@@ -36,7 +41,7 @@
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- dependency upgrade and improvements
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## 2.3.0
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- breaking changes in createOffer and createAnswer (removed dead code prepareTransReceiver)
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- fixed audio and video mute events not working due to #120 raised by @liemfs
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- fixed audio and video mute events not working due to #120 raised by @liemfs
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## 2.2.15
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- added support for simulcasting in `initMediaDevice`

‎example/lib/typed_examples/streaming.dart‎

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import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:janus_client/janus_client.dart';
@@ -25,6 +26,7 @@ class _StreamingState extends State<TypedStreamingV2> {
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late StateSetter _setState;
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bool isPlaying = true;
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bool isMuted = false;
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Timer? _bitrateTimer;
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showStreamSelectionDialog() async {
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return showDialog(
@@ -118,6 +120,26 @@ class _StreamingState extends State<TypedStreamingV2> {
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setState(() {
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_loader = false;
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});
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// Monitor bitrate every 5 seconds
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_bitrateTimer = Timer.periodic(Duration(seconds: 5), (timer) async {
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if (!mounted) {
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timer.cancel();
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return;
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}
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// Get bitrate for the first video stream
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final bitrate = await plugin.getBitrate();
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if (bitrate != null) {
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print('Current bitrate: $bitrate');
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}
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// Get bitrate for specific mid (if you know the mid)
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// final specificBitrate = await plugin.getBitrate('v1');
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// if (specificBitrate != null) {
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// print('Bitrate for mid v1: $specificBitrate');
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// }
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});
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}
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if (data is StreamingPluginStoppingEvent) {
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destroy();
@@ -271,6 +293,7 @@ class _StreamingState extends State<TypedStreamingV2> {
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void dispose() async {
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// TODO: implement dispose
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super.dispose();
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_bitrateTimer?.cancel();
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destroy();
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}
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}

‎lib/janus_plugin.dart‎

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@@ -56,6 +56,10 @@ class JanusPlugin {
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StreamSubscription? _wsStreamSubscription;
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late bool pollingActive;
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// Bitrate calculation variables - separate history per mid
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Map<String, int> _lastBytesReceivedMap = {};
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Map<String, int> _lastTimestampMap = {};
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RTCPeerConnection? get peerConnection {
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return webRTCHandle?.peerConnection;
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}
@@ -598,6 +602,68 @@ class JanusPlugin {
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}
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}
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/// Gets a verbose description of the currently received video stream bitrate
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/// [mid] optional mid to specify the stream, first video stream if missing
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/// Similar to janus.js getBitrate() function
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Future<String?> getBitrate([String? mid]) async {
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if (webRTCHandle?.peerConnection == null) {
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return null;
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}
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final stats = await webRTCHandle!.peerConnection!.getStats();
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final nowMillis = DateTime.now().millisecondsSinceEpoch;
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String? result;
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for (var report in stats) {
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// Look for the specific mid or first video stream
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bool isTargetStream = false;
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if (mid != null) {
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// Look for specific mid
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if (report.values['mid'] == mid &&
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report.type == 'inbound-rtp' &&
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report.values['kind'] == 'video') {
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isTargetStream = true;
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}
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} else {
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// Look for first video stream
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if (report.type == 'inbound-rtp' &&
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report.values['kind'] == 'video') {
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isTargetStream = true;
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}
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}
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if (isTargetStream && report.values['bytesReceived'] != null) {
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final currentBytesReceived = report.values['bytesReceived'] as int;
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// Determine history key (use "default" if mid is null)
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final historyKey = mid ?? "default";
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// Calculate bitrate if we have previous values
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if (_lastBytesReceivedMap[historyKey] != null && _lastTimestampMap[historyKey] != null) {
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final bytesDiff = currentBytesReceived - _lastBytesReceivedMap[historyKey]!;
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final timeDiff = (nowMillis - _lastTimestampMap[historyKey]!) / 1000.0;
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648+
if (timeDiff > 0 && bytesDiff >= 0) {
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final bitsDiff = bytesDiff * 8;
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final bitsPerSecond = bitsDiff / timeDiff;
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final kbps = (bitsPerSecond / 1000).round();
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653+
result = "$kbps kbps";
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}
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}
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657+
// Store current values for next calculation
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_lastBytesReceivedMap[historyKey] = currentBytesReceived;
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_lastTimestampMap[historyKey] = nowMillis;
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break; // Found our target stream
661+
}
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}
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664+
return result;
665+
}
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/// Send text message on existing text room using data channel with same label as specified during initDataChannel() method call.
602668
///
603669
/// for now janus text room only supports text as string although with normal data channel api we can send blob or Uint8List if we want.

‎test/janus_plugin_test.dart‎

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import 'dart:io';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:janus_client/janus_client.dart';
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class _MyHttpOverrides extends HttpOverrides {}
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void main() async {
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TestWidgetsFlutterBinding.ensureInitialized();
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HttpOverrides.global = _MyHttpOverrides();
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group('JanusPlugin getBitrate() Basic Tests', () {
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late JanusPlugin plugin;
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late JanusClient client;
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late JanusTransport transport;
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setUp(() {
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transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
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client = JanusClient(transport: transport);
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// Create a basic streaming plugin for testing
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plugin = JanusStreamingPlugin(
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context: client,
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handleId: 123,
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transport: transport,
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session: JanusSession(transport: transport, context: client),
26+
);
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});
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29+
test('getBitrate returns null when no WebRTC connection', () async {
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// Act
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final result = await plugin.getBitrate();
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// Assert
34+
expect(result, isNull,
35+
reason: 'getBitrate should return null when no WebRTC connection is established');
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});
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test('getBitrate returns null when called with mid parameter and no connection', () async {
39+
// Act
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final result = await plugin.getBitrate('v1');
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// Assert
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expect(result, isNull,
44+
reason: 'getBitrate should return null for specific mid when no WebRTC connection');
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});
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47+
test('getBitrate handles empty mid parameter correctly', () async {
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// Act
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final result = await plugin.getBitrate('');
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// Assert
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expect(result, isNull,
53+
reason: 'getBitrate should handle empty mid parameter gracefully');
54+
});
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56+
test('getBitrate method exists and is callable', () {
57+
// Assert
58+
expect(plugin.getBitrate, isA<Function>(),
59+
reason: 'getBitrate method should exist on JanusPlugin');
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});
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62+
test('getBitrate method signature accepts optional mid parameter', () {
63+
// This test verifies the method signature at compile time
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// No runtime assertions needed - compilation success is the test
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66+
// Act & Assert - These should compile without errors
67+
plugin.getBitrate(); // No parameter
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plugin.getBitrate(null); // Explicit null
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plugin.getBitrate('v1'); // String parameter
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71+
expect(true, isTrue, reason: 'Method signature test passed');
72+
});
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});
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75+
group('JanusPlugin getBitrate() Implementation Tests', () {
76+
test('Bitrate calculation variables are properly initialized', () {
77+
final transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
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final client = JanusClient(transport: transport);
79+
final plugin = JanusStreamingPlugin(
80+
context: client,
81+
handleId: 123,
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transport: transport,
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session: JanusSession(transport: transport, context: client),
84+
);
85+
86+
// The fact that we can create the plugin without errors
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// indicates that the bitrate tracking variables are properly initialized
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expect(plugin, isNotNull);
89+
expect(plugin.getBitrate, isA<Function>());
90+
});
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test('Multiple getBitrate calls with different mids should not interfere', () async {
93+
final transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
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final client = JanusClient(transport: transport);
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final plugin = JanusStreamingPlugin(
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context: client,
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handleId: 123,
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transport: transport,
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session: JanusSession(transport: transport, context: client),
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);
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102+
// Act - Multiple calls with different parameters
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final result1 = await plugin.getBitrate();
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final result2 = await plugin.getBitrate('v1');
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final result3 = await plugin.getBitrate('v2');
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final result4 = await plugin.getBitrate(); // Back to default
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// Assert - All should return null (no WebRTC connection)
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// but importantly, they should not throw exceptions
110+
expect(result1, isNull);
111+
expect(result2, isNull);
112+
expect(result3, isNull);
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expect(result4, isNull);
114+
});
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116+
test('getBitrate with null mid parameter should behave same as no parameter', () async {
117+
final transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
118+
final client = JanusClient(transport: transport);
119+
final plugin = JanusStreamingPlugin(
120+
context: client,
121+
handleId: 123,
122+
transport: transport,
123+
session: JanusSession(transport: transport, context: client),
124+
);
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// Act
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final result1 = await plugin.getBitrate(null);
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final result2 = await plugin.getBitrate();
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// Assert - Both should return same result (null in this case)
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expect(result1, equals(result2),
132+
reason: 'getBitrate(null) should behave identically to getBitrate()');
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});
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test('getBitrate should handle very long mid strings gracefully', () async {
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final transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
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final client = JanusClient(transport: transport);
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final plugin = JanusStreamingPlugin(
139+
context: client,
140+
handleId: 123,
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transport: transport,
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session: JanusSession(transport: transport, context: client),
143+
);
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// Act
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final longMid = 'a' * 1000; // Very long string
147+
final result = await plugin.getBitrate(longMid);
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// Assert - Should not throw exception
150+
expect(result, isNull,
151+
reason: 'getBitrate should handle very long mid strings gracefully');
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});
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test('getBitrate should handle special characters in mid parameter', () async {
155+
final transport = RestJanusTransport(url: 'https://janus.conf.meetecho.com/janus');
156+
final client = JanusClient(transport: transport);
157+
final plugin = JanusStreamingPlugin(
158+
context: client,
159+
handleId: 123,
160+
transport: transport,
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session: JanusSession(transport: transport, context: client),
162+
);
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164+
// Act - Test various special characters
165+
final specialMids = ['v1-test', 'v1_test', 'v1.test', 'v1@test', 'v1#test', '日本語'];
166+
167+
for (final mid in specialMids) {
168+
final result = await plugin.getBitrate(mid);
169+
expect(result, isNull,
170+
reason: 'getBitrate should handle special characters in mid: $mid');
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}
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});
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});
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}

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