FlutterPianoAudioDetection Plugin

Flutter Piano Audio Detection implemented with Tensorflow Lite Model (Google Magenta)

• x Android Implementation
• x iOS/iPadOS Implementation

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Example Demo

Setting up a Flutter app with flutter_piano_audio_detection

1. Setting Tensorflow model file into your project

First, Add tensorflow lite file in your project. Copy the downloaded onsets_frames_wavinput.tflite.

Android : Copy the downloaded file YourApp/android/app/src/main/assets
iOS : Navigator -> Build Phases -> Copy Bundle Resourse

If you have experience installing other plugins, it should be very simple.

2. iOS Installation & Permissions

1. Add the permissions below to your info.plist. This could be found in

    <key>NSMicrophoneUsageDescription</key>
    <string>Your Text</string>

2. Add the following to your Podfile file. Since the AudioModule library is sensitive to the iOS version, please apply the ios version in the Podfile to 12.1. and This plugin depends on [permission_handler flutter plugin](https://pub.dev/packages/permission_handler).

    platform :ios, '12.1' // or higher version.
    
    // ...
 
    post_install do |installer|
      installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
          config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
            '$(inherited)',
            ## dart: PermissionGroup.microphone
            'PERMISSION_MICROPHONE=1',
          ]
        end
      end
    end

3. Android Installation & Permissions

1. Add the permissions below to your AndroidManifest. This could be found in

<uses-permission android:name="android.permission.RECORD_AUDIO" />

2. Edit the following below to your build.gradle. This could be found in YourApp/app/src/For example:

aaptOptions {
        noCompress 'tflite'
  }

How to use this plugin

Please look at the example on how to implement these futures.

1. Add line in pubspec.yaml

  dependencies:
    flutter_piano_audio_detection: ${version}

2. Usage in Flutter Code

  import 'package:flutter_piano_audio_detection/flutter_piano_audio_detection.dart';
  // ...
  
  class _YourAppState extends State<MyApp> {
    FlutterPianoAudioDetection fpad = new FlutterPianoAudioDetection();
  
    Stream<List<dynamic>>? result;
    List<String> notes = [];
    
    // ...
    
    @override
    void initState() {
      super.initState();
      fpad.prepare();
    }
  
    void start() {
      fpad.start(); // Start Engine 
      getResult();  // Event Subscription
    }

    void stop() {
      fpad.stop();  // Stop Engine
    }

    void getResult() {
      result = fpad.startAudioRecognition();
      result!.listen((event) {
        setState(() {
          notes = fpad.getNotes(event); // notes = [C3, D3]
        });
      });
    }
    // ...
  }

License

MIT

Reference

• TensorflowLite https://www.tensorflow.org/lite
• Goole Magenta https://github.com/magenta/magenta