🔨 Fixed player button not showing up and made bitrate nullable and update default recording extension to m4a (#140)

Co-authored-by: ujas-m-simformsolutions <ujasthakkar54@gmail.com>

Author: ujas-m-simformsolutions

CHANGELOG.md

@@ -13,6 +13,7 @@
 - **BREAKING**: Replaced `normalizationFactor` with `scaleFactor`and with this fixed [#43](https://github.com/SimformSolutionsPvtLtd/audio_waveforms/issues/43) 
 - Updated default values for bitRate and sampleRate
 - Encoders, sample rate and bit rate can now Directly be set from `record` function.
+- Bitrate is now nullable and default audio extension is now `m4a`. 
 - Updated example app
 
 ## 0.1.5+1

android/src/main/kotlin/com/simform/audio_waveforms/AudioRecorder.kt

@@ -22,22 +22,23 @@ class AudioRecorder : PluginRegistry.RequestPermissionsResultListener {
         result.success(recorder?.maxAmplitude?.toDouble() ?: 0.0)
     }
 
-    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
     fun initRecorder(
         path: String,
         result: MethodChannel.Result,
         recorder: MediaRecorder?,
         encoder: Int,
         outputFormat: Int,
         sampleRate: Int,
-        bitRate: Int
+        bitRate: Int?
     ) {
         recorder?.apply {
             setAudioSource(MediaRecorder.AudioSource.MIC)
             setOutputFormat(getOutputFormat(outputFormat))
             setAudioEncoder(getEncoder(encoder))
             setAudioSamplingRate(sampleRate)
-            setAudioEncodingBitRate(bitRate)
+            if (bitRate != null) {
+                setAudioEncodingBitRate(bitRate)
+            }
             setOutputFile(path)
             try {
                 recorder.prepare()

android/src/main/kotlin/com/simform/audio_waveforms/AudioWaveformsPlugin.kt

@@ -30,8 +30,8 @@ class AudioWaveformsPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
     private var path: String? = null
     private var encoder: Int = 0
     private var outputFormat: Int = 0
-    private var sampleRate: Int = 16000
-    private var bitRate: Int = 64000
+    private var sampleRate: Int = 44100
+    private var bitRate: Int? = null
     private lateinit var applicationContext: Context
 
     //Todo: bitrate
@@ -51,8 +51,8 @@ class AudioWaveformsPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
                 path = call.argument(Constants.path) as String?
                 encoder = (call.argument(Constants.encoder) as Int?) ?: 0
                 outputFormat = (call.argument(Constants.outputFormat) as Int?) ?: 0
-                sampleRate = (call.argument(Constants.sampleRate) as Int?) ?: 16000
-                bitRate = (call.argument(Constants.bitRate) as Int?) ?: 64000
+                sampleRate = (call.argument(Constants.sampleRate) as Int?) ?: 44100
+                bitRate = (call.argument(Constants.bitRate) as Int?)
                 checkPathAndInitialiseRecorder(result, encoder, outputFormat, sampleRate, bitRate)
             }
             Constants.startRecording -> audioRecorder.startRecorder(result, recorder)
@@ -160,13 +160,12 @@ class AudioWaveformsPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
     private fun checkPathAndInitialiseRecorder(
         result: Result,
         encoder: Int,
         outputFormat: Int,
         sampleRate: Int,
-        bitRate: Int
+        bitRate: Int?
     ) {
         try {
             recorder = MediaRecorder()
@@ -179,7 +178,7 @@ class AudioWaveformsPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
             val dateTimeInstance = SimpleDateFormat(Constants.fileNameFormat, Locale.US)
             val currentDate = dateTimeInstance.format(Date())
             try {
-                outputFile = File.createTempFile(currentDate, ".aac", outputDir)
+                outputFile = File.createTempFile(currentDate, ".m4a", outputDir)
                 path = outputFile.path
                 audioRecorder.initRecorder(
                     path!!,

example/lib/chat_bubble.dart

@@ -150,7 +150,7 @@ class _WaveBubbleState extends State<WaveBubble> {
               child: Row(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  if (controller.playerState.isStopped)
+                  if (!controller.playerState.isStopped)
                     IconButton(
                       onPressed: () async {
                         controller.playerState.isPlaying

example/lib/main.dart

@@ -47,7 +47,7 @@ class _HomeState extends State<Home> with WidgetsBindingObserver {
 
   void _getDir() async {
     appDirectory = await getApplicationDocumentsDirectory();
-    path = "${appDirectory.path}/recording.mp3";
+    path = "${appDirectory.path}/recording.m4a";
     isLoading = false;
     setState(() {});
   }
@@ -57,8 +57,7 @@ class _HomeState extends State<Home> with WidgetsBindingObserver {
       ..androidEncoder = AndroidEncoder.aac
       ..androidOutputFormat = AndroidOutputFormat.mpeg4
       ..iosEncoder = IosEncoder.kAudioFormatMPEG4AAC
-      ..sampleRate = 44100
-      ..bitRate = 48000;
+      ..sampleRate = 44100;
   }
 
   void _pickFile() async {
@@ -114,7 +113,8 @@ class _HomeState extends State<Home> with WidgetsBindingObserver {
                           index: index + 1,
                           isSender: index.isOdd,
                           width: MediaQuery.of(context).size.width / 2,
-                          isLastWidget: !isRecordingCompleted || musicFile == null,
+                          isLastWidget:
+                              !isRecordingCompleted || musicFile == null,
                           appDirectory: appDirectory,
                         );
                       },
@@ -212,21 +212,27 @@ class _HomeState extends State<Home> with WidgetsBindingObserver {
   }
 
   void _startOrStopRecording() async {
-    if (isRecording) {
-      recorderController.reset();
-      final path = await recorderController.stop(false);
-
-      if (path != null) {
-        isRecordingCompleted = true;
-        debugPrint("Recorded file size: ${File(path).lengthSync()}");
-        debugPrint(path);
+    try {
+      if (isRecording) {
+        recorderController.reset();
+
+        final path = await recorderController.stop(false);
+
+        if (path != null) {
+          isRecordingCompleted = true;
+          debugPrint("Recorded file size: ${File(path).lengthSync()}");
+          debugPrint(path);
+        }
+      } else {
+        await recorderController.record();
       }
-    } else {
-      await recorderController.record(path: path);
+    } catch (e) {
+      debugPrint(e.toString());
+    } finally {
+      setState(() {
+        isRecording = !isRecording;
+      });
     }
-    setState(() {
-      isRecording = !isRecording;
-    });
   }
 
   void _refreshWave() {

ios/Classes/AudioRecorder.swift

@@ -9,19 +9,26 @@ public class AudioRecorder: NSObject, AVAudioRecorderDelegate{
 
     public func startRecording(_ result: @escaping FlutterResult,_ path: String?,_ encoder : Int?,_ sampleRate : Int?,_ bitRate : Int?,_ fileNameFormat: String){
         let settings = [
-            AVEncoderBitRateKey: bitRate ?? 48000,
             AVFormatIDKey: getEncoder(encoder ?? 0),
             AVSampleRateKey: sampleRate ?? 44100,
             AVNumberOfChannelsKey: 1,
             AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
         ]
+        let settingsWithBitrate = [
+                AVEncoderBitRateKey: bitRate,
+                AVFormatIDKey: getEncoder(encoder ?? 0),
+                AVSampleRateKey: sampleRate ?? 44100,
+                AVNumberOfChannelsKey: 1,
+                AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
+        ]
+        
         let options: AVAudioSession.CategoryOptions = [.defaultToSpeaker, .allowBluetooth]
         if (path == nil) {
             let directory = NSTemporaryDirectory()
             let date = Date()
             let dateFormatter = DateFormatter()
             dateFormatter.dateFormat = fileNameFormat
-            let fileName = dateFormatter.string(from: date) + ".aac"
+            let fileName = dateFormatter.string(from: date) + ".m4a"
 
             self.path = NSURL.fileURL(withPathComponents: [directory, fileName])?.absoluteString
         } else {
@@ -34,7 +41,7 @@ public class AudioRecorder: NSObject, AVAudioRecorderDelegate{
             try AVAudioSession.sharedInstance().setActive(true)
 
             let url = URL(string: self.path!) ?? URL(fileURLWithPath: self.path!)
-            audioRecorder = try AVAudioRecorder(url: url, settings: settings)
+            audioRecorder = try AVAudioRecorder(url: url, settings: bitRate != nil ? settingsWithBitrate as [String : Any] : settings as [String : Any])
             audioRecorder?.delegate = self
             audioRecorder?.isMeteringEnabled = true
             audioRecorder?.record()

lib/src/base/audio_waveforms_interface.dart

@@ -12,7 +12,7 @@ class AudioWaveformsInterface {
   Future<bool> record({
     required int audioFormat,
     required int sampleRate,
-    required int bitRate,
+    int? bitRate,
     String? path,
   }) async {
     final isRecording = await _methodChannel.invokeMethod(
@@ -35,7 +35,7 @@ class AudioWaveformsInterface {
     required int encoder,
     required int outputFormat,
     required int sampleRate,
-    required int bitRate,
+    int? bitRate,
   }) async {
     final initialized = await _methodChannel.invokeMethod(
       Constants.initRecorder,

lib/src/controllers/recorder_controller.dart

@@ -21,11 +21,14 @@ class RecorderController extends ChangeNotifier {
 
   int sampleRate = 44100;
 
-  int bitRate = 48000;
+  int? bitRate;
 
   /// Current maximum peak power for ios and peak amplitude android.
   double _maxPeak = Platform.isIOS ? 1 : 32786.0;
 
+  /// Current min value.
+  double _currentMin = 0;
+
   /// Current list of scaled waves. For IOS, this list contains normalised
   /// peak power and for Android, this list contains normalised peak
   /// amplitude.
@@ -279,7 +282,15 @@ class RecorderController extends ChangeNotifier {
   void _normalise(double peak) {
     final absDb = peak.abs();
     _maxPeak = max(absDb, _maxPeak);
-    final scaledWave = (absDb / _maxPeak);
+
+    // calculates min value
+    _currentMin = _waveData.fold(
+      0,
+      (previousValue, element) =>
+          element < previousValue ? element : previousValue,
+    );
+
+    final scaledWave = (absDb - _currentMin) / (_maxPeak - _currentMin);
     _waveData.add(scaledWave);
     notifyListeners();
   }