adding packages

deprecated/flutter_midi/lib/src/cache.dart

@@ -0,0 +1,16 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:path_provider/path_provider.dart';
+
+Future<File?> writeToFile(ByteData data,
+    {String name = "instrument.sf2"}) async {
+  if (kIsWeb) return null;
+  final buffer = data.buffer;
+  final directory = await getApplicationDocumentsDirectory();
+  final path = "${directory.path}/$name";
+  return File(path)
+      .writeAsBytes(buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
+}

deprecated/flutter_midi/lib/src/method_channel.dart

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+import 'package:flutter/services.dart';
+
+import 'platform_interface.dart';
+
+const MethodChannel _channel = MethodChannel('flutter_midi');
+
+class MethodChannelUrlLauncher extends FlutterMidiPlatform {
+  /// Needed so that the sound font is loaded
+  /// On iOS make sure to include the sound_font.SF2 in the Runner folder.
+  /// This does not work in the simulator.
+  @override
+  Future<String?> prepare({
+    required ByteData? sf2,
+    String name = 'instrument.sf2',
+  }) async {
+    return _channel.invokeMethod<String>('prepare_midi', {
+      'name': name,
+      'data': sf2,
+    });
+  }
+
+  /// Needed so that the sound font is loaded
+  /// On iOS make sure to include the sound_font.SF2 in the Runner folder.
+  /// This does not work in the simulator.
+  @override
+  Future<String?> changeSound({
+    required ByteData? sf2,
+    String name = 'instrument.sf2',
+  }) async {
+    return _channel.invokeMethod<String>('change_sound', {
+      'name': name,
+      'data': sf2,
+    });
+  }
+
+  /// Unmute the device temporarily even if the mute switch is on or toggled in settings.
+  @override
+  Future<String?> unmute() {
+    return _channel.invokeMethod<String>('unmute');
+  }
+
+  /// Use this when stopping the sound onTouchUp or to cancel a long file.
+  /// Not needed if playing midi onTap.
+  /// Stop with velocity in the range between 0-127
+  @override
+  Future<String?> stopMidiNote({
+    required int midi,
+    int velocity = 64,
+  }) {
+    return _channel.invokeMethod<String>('stop_midi_note', {
+      'note': midi,
+      'velocity': velocity,
+    });
+  }
+
+  /// Play a midi note from the sound_font.SF2 library bundled with the application.
+  /// Play a midi note in the range between 0-127
+  /// Play with velocity in the range between 0-127
+  /// Multiple notes can be played at once as separate calls.
+  @override
+  Future<String?> playMidiNote({
+    required int midi,
+    int velocity = 64,
+  }) {
+    return _channel.invokeMethod<String>('play_midi_note', {
+      'note': midi,
+      'velocity': velocity,
+    });
+  }
+}

deprecated/flutter_midi/lib/src/platform_interface.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+import 'method_channel.dart';
+
+class FlutterMidiPlatform extends PlatformInterface {
+  FlutterMidiPlatform() : super(token: _token);
+  static final Object _token = Object();
+  static FlutterMidiPlatform _instance = MethodChannelUrlLauncher();
+  static FlutterMidiPlatform get instance => _instance;
+  static set instance(FlutterMidiPlatform instance) {
+    PlatformInterface.verifyToken(instance, _token);
+    _instance = instance;
+  }
+
+  /// Needed so that the sound font is loaded
+  /// On iOS make sure to include the sound_font.SF2 in the Runner folder.
+  /// This does not work in the simulator.
+  Future<String?> prepare({
+    required ByteData? sf2,
+    String name = 'instrument.sf2',
+  }) async {
+    debugPrint('Setup Midi..');
+    throw UnimplementedError('prepare() has not been implemented.');
+  }
+
+  /// Needed so that the sound font is loaded
+  /// On iOS make sure to include the sound_font.SF2 in the Runner folder.
+  /// This does not work in the simulator.
+  Future<String?> changeSound({
+    required ByteData? sf2,
+    String name = 'instrument.sf2',
+  }) async {
+    throw UnimplementedError('changeSound() has not been implemented.');
+  }
+
+  /// Unmute the device temporarily even if the mute switch is on or toggled in settings.
+  Future<String?> unmute() async {
+    throw UnimplementedError('canLaunch() has not been implemented.');
+  }
+
+  /// Use this when stopping the sound onTouchUp or to cancel a long file.
+  /// Not needed if playing midi onTap.
+  /// Stop with velocity in the range between 0-127
+  Future<String?> stopMidiNote({
+    required int midi,
+    int velocity = 64,
+  }) async {
+    throw UnimplementedError('stopMidiNote() has not been implemented.');
+  }
+
+  /// Play a midi note from the sound_font.SF2 library bundled with the application.
+  /// Play a midi note in the range between 0-127
+  /// Play with velocity in the range between 0-127
+  /// Multiple notes can be played at once as separate calls.
+  Future<String?> playMidiNote({
+    required int midi,
+    int velocity = 64,
+  }) async {
+    throw UnimplementedError('playMidiNote() has not been implemented.');
+  }
+}