DartMeltySoundFont - a SoundFont synthesizer (i.e. '.sf2' player) written in pure Dart

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Templates DartMeltySoundFont
Overview

DartMeltySoundFont

DartMeltySoundFont is a SoundFont synthesizer (i.e. '.sf2' player) written in pure Dart.

It is a port of MeltySynth (C#, MIT License) written by Nobuaki Tanaka, to Dart.

https://github.com/sinshu/meltysynth

Dependencies

This package has no dependencies.

Maintanence

Apart from breaking changes to the Dart language (rare), this package has no external dependencies and should work on any Dart SDK >=2.12 indefinitely. This package was written against Dart SDK 2.16.1.

Example

Ssynthesize a simple chord:


// Necessary Imports
import 'package:dart_melty_soundfont/dart_melty_soundfont.dart';
import 'package:flutter/services.dart' show rootBundle;

// Create the synthesizer.
ByteData bytes = await rootBundle.load('assets/akai_steinway.sf2');

Synthesizer synth = Synthesizer.loadByteData(bytes, 
    SynthesizerSettings(
        sampleRate: 44100, 
        blockSize: 64, 
        maximumPolyphony: 64, 
        enableReverbAndChorus: true,
    ));

// Turn on some notes
synth.noteOn(channel: 0, key: 72, velocity: 120);
synth.noteOn(channel: 0, key: 76, velocity: 120);
synth.noteOn(channel: 0, key: 79, velocity: 120);
synth.noteOn(channel: 0, key: 82, velocity: 127);

// Render the waveform (3 seconds)
ArrayInt16 buf16 = ArrayInt16.zeros(numShorts: 44100 * 3);

synth.renderMonoInt16(buf16);

Features

  • No memory allocation in the rendering process.

  • Wave synthesis

    • SoundFont reader
    • Waveform generator
    • Envelope generator
    • Low-pass filter
    • Vibrato LFO
    • Modulation LFO

  • MIDI message processing

    • Note on/off
    • Bank selection
    • Modulation
    • Volume control
    • Pan
    • Expression
    • Hold pedal
    • Program change
    • Pitch bend
    • Tuning

  • Effects

    • Reverb
    • Chorus

  • Other things

    • Loop extension support
    • Performace optimization

Todo

  • MIDI file support.

Feel free to port MIDI file support to Dart and make a pull request.

Its usage would look like this when implemented:

// Create the synthesizer.
var sampleRate = 44100;
var synthesizer = new Synthesizer("TimGM6mb.sf2", sampleRate);

// Read the MIDI file.
var midiFile = MidiFile("flourish.mid");
var sequencer = MidiFileSequencer(synthesizer);
sequencer.play(midiFile, false);

// Render the waveform (3 seconds)
ArrayInt16 buf16 = ArrayInt16.zeros(numShorts: 44100 * 3);

sequencer.renderMonoInt16(buf16);

License

DartMeltySoundFont is available under the MIT license.

References

Comments
  • SampleEndLoop error comes up

    SampleEndLoop error comes up

    I am getting a flutter: 'sampleEndLoop' is out of range. 'STRING error. My code

    static byteToPlayer() async { try{ // Create the synthesizer. ByteData bytes = await rootBundle.load(defaultURL);

      Synthesizer synth = Synthesizer.loadByteData(bytes);

  // Turn on some notes
  synth.noteOn(channel: 0, key: noteToPlay, velocity: 120);

  // Render the waveform (3 seconds)
  ArrayInt16 buf16 = ArrayInt16.zeros(numShorts: 44100 * 3);

  synth.renderMonoInt16(buf16);

  return {"bytes" : buf16.bytes.buffer.asUint8List(), "isSuccessful": true};
}catch(e){
  print('byteToPlayer');
  print(e);
  return {"bytes" : 0, "isSuccessful": false};
}

    }

    opened by nathanblanchard12 16
  • metronom.sf renders all zeros

    metronom.sf renders all zeros

    How can I play the rendered ArrayInt16 in a player like flutter_sounds?

    I've tried the following but it doesn't work:

        // Render the waveform (3 seconds)
    final buf16 = ArrayInt16.zeros(numShorts: sampleRate * 3);
    synth.renderMonoInt16(buf16);

    // play
    final bytes = buf16.bytes.buffer.asUint8List();
    player.startPlayer(
      fromDataBuffer: bytes,
      codec: Codec.pcm16,
      whenFinished: () => debugPrint("Calibrator.play – finished."),
    );

    DO zou have an example for how to play the ArrayInt16?

    opened by abegehr 11
  • Render function fails with exception

    Render function fails with exception

    Thanks for this great port of MeltySynth which I use in my C# project.

    I'm trying to create a Flutter version of my project but the library has a weird problem which does not exist in the C# version.

    Here's the sample application which demonstrates the problem:

    DartMeltySoundFontTest.zip

    My real application feeds the sound output with synthesized midi data.

    The sample application simulates this with the following loop:

    image

    However after a few seconds, an exception occurs in the following function:

    image

    If I encapsulate this part in a try/catch block everything seems to work fine but I'm not sure if it has any side effects or creates performance problems.

    Can you please check what's wrong here?

    opened by postacik 6
  • Import as Package

    Import as Package

    Thank you for building and publishing this package! I'm unable to import any resources from the package after install in in pubspec.yaml. The example references a non-package import: https://pub.dev/packages/dart_melty_soundfont#example I'm looking for a package import like referenced here: https://dart.dev/guides/libraries/create-library-packages#importing-library-files

    opened by abegehr 5
  • modify to be a valid package

    modify to be a valid package

    Please merge this and update version numbering. The src directory is moved into lib directory, and modify lib/src/synthesizer.dart not to use flutter package (to keep it pure dart). If there are multiple necessary imports, you can export them from single file.

    opened by marrlex 4
  • Build Failure on iOS with Readme example code

    Build Failure on iOS with Readme example code

    I'm running the example code from the readme: https://pub.dev/packages/dart_melty_soundfont#example And am getting a build failure on iOS.

    Build failure logs 
    ** BUILD FAILED **
Xcode's output:
↳
    Writing result bundle at path:
    	[/var/folders/qm/p7v8v0tn1rs_7lzhx8s_39q00000gn/T/flutter_tools.EXfodr/flutter_ios_build_temp_dirqI0dsC/temporary_xcresult_bundle]()
: Error: Type 'ByteData' not found.
../…/lib/synthesizer.dart:112
        factory Synthesizer.loadByteData(ByteData data, [SynthesizerSettings? settings])
                                         ^^^^^^^^
: Error: Expected ';' after this.
../…/services/binding.dart:374
          ui.channelBuffers.setListenerchannel, (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
                            ^^^^^^^^^^^^^^^^^^
: Error: Expected an identifier, but got ','.
../…/services/binding.dart:374
    Try inserting an identifier before ','.
          ui.channelBuffers.setListenerchannel, (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
                                              ^
: Error: Unexpected token ','.
../…/services/binding.dart:374
          ui.channelBuffers.setListenerchannel, (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
                                              ^
: Error: Expected ';' after this.
../…/services/binding.dart:388
          });
          ^
: Error: Expected an identifier, but got ')'.
../…/services/binding.dart:388
    Try inserting an identifier before ')'.
          });
           ^
: Error: Unexpected token ')'.
../…/services/binding.dart:388
          });
           ^
: Error: The getter 'setListenerchannel' isn't defined for the class 'ChannelBuffers'.
../…/services/binding.dart:374
     - 'ChannelBuffers' is from 'dart:ui'.
    Try correcting the name to the name of an existing getter, or defining a getter or field named 'setListenerchannel'.
          ui.channelBuffers.setListenerchannel, (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
                            ^^^^^^^^^^^^^^^^^^
: Error: 'ByteData' isn't a type.
../…/lib/synthesizer.dart:112
        factory Synthesizer.loadByteData(ByteData data, [SynthesizerSettings? settings])
                                         ^^^^^^^^
    Failed to package [/Users/anton/local/repos/mashup.]()
    Command PhaseScriptExecution failed with a nonzero exit code
    note: Using new build system
    note: Planning
    note: Build preparation complete
    note: Building targets in dependency order
    Result bundle written to path:
    	[/var/folders/qm/p7v8v0tn1rs_7lzhx8s_39q00000gn/T/flutter_tools.EXfodr/flutter_ios_build_temp_dirqI0dsC/temporary_xcresult_bundle]()
Could not build the precompiled application for the device.
    Flutter doctor output 
    [flutter] flutter doctor -v
[✓] Flutter (Channel beta, 2.11.0-0.1.pre, on macOS 12.3 21E5222a darwin-x64, locale en-DE)
    • Flutter version 2.11.0-0.1.pre at /Users/anton/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b101bfe32f (2 weeks ago), 2022-02-16 07:36:54 -0800
    • Engine revision e355993572
    • Dart version 2.17.0 (build 2.17.0-69.2.beta)
    • DevTools version 2.10.0-dev.1

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/anton/Library/Android/sdk
    • Platform android-32, build-tools 32.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.3)
    • Xcode at /Applications/Xcode-beta.app/Contents/Developer
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2020.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)

[✓] VS Code (version 1.62.3)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.29.0

[✓] Connected device (2 available)
    • Anton’s iPhone (mobile) • 00008101-0002249636B8001E • ios            • iOS 15.4 19E5241a
    • Chrome (web)            • chrome                    • web-javascript • Google Chrome 99.0.4844.51

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!
exit code 0
    opened by abegehr 3
  • A bug due to a typo

    A bug due to a typo

    A bug due to a typo was found in the C# version. It seems that the Dart version also has this bug. Please check this issue: https://github.com/sinshu/meltysynth/issues/15

    https://github.com/chipweinberger/DartMeltySoundFont/blob/914b72fbe09fe8e6918bf4c37ca4968ecc2db6aa/lib/synthesizer.dart#L217-L223

    opened by sinshu 2
  • Exception occurs for some sound font files

    Exception occurs for some sound font files

    meltysynth library raises an exception for some sound font files.

    It was fixed in the last commit.

    Can you please apply the same fix to your library?

    https://github.com/sinshu/meltysynth/issues/14#issuecomment-1114255892

    opened by postacik 2
  • Example project For Web

    Example project For Web

    Hello can you add an example to the project. It would be easier to figure out if it works. I might be using it wrong but I hear no audio. I am not sure if it is my sf2 file or computer or settings

    opened by nathanblanchard12 1
  • How to connect to raw_sound?

    How to connect to raw_sound?

    Can you please help me how to connect DartMeltySoundFont with raw_sound?

    I am using this example from raw_sound: https://pub.dev/packages/raw_sound/example

    In that example, there is this line

    await _playerPCMI16.feed(dataBlock);

    Which apparently "Feeds the player with raw PCM [data] block" according to the documentation of this method. The parameter of feed() is expected to be of the type Uint8List.

    When I look at the sample code of DartMeltySoundFont, I see the variable buf16 of the type ArrayInt16.

    How do I cast ArrayInt16 to Uint8List?

    Thanks for your help. I am new to the area of digital sound creation.

    opened by lukassteiner 4
  • Midi file support

    Midi file support

    Hi, I added midi file sequencer feature in my fork.

    I tried to obey your style of conversion from C#.

    The code is not battle tested but it works with my test midi files as you can see in the video below:

    https://user-images.githubusercontent.com/3977227/167107533-c0a27b20-8b96-4be5-9d10-d0bec5dfa44a.mp4

    I hope it would help you to complete the library :)

    opened by postacik 3
Owner
Chip Weinberger
Chip Weinberger
GitHub
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