Send real-time PCM audio (16-bit integer) to your device speakers, from your Flutter app!
FlutterPcmSound has zero dependencies besides Flutter, Android, iOS, and MacOS themselves.
Unlike other plugins, flutter_pcm_sound does not use audio files (For example: sound_pool).
Instead, flutter_pcm_sound is for apps that generate audio in realtime a few milliseconds before you hear it. For example, using dart_melty_soundfont.
In contrast to raw_sound, FlutterPcmSound uses a callback setFeedCallback to signal when to feed more samples.
You can lower the feed threshold using setFeedThreshold to achieve real time audio, or increase it to have a cushy buffer.
To play audio, just keep calling feed.
To stop audio, just stop calling feed.
// for testing purposes, a C-Major scale
MajorScale scale = MajorScale(sampleRate: 44100, noteDuration: 0.25);
// invoked whenever we need to feed more samples to the platform
void onFeed(int remainingFrames) async {
// you could use 'remainingFrames' to feed very precisely.
// But here we just load a few thousand samples everytime we run low.
List<int> frame = scale.generate(periods: 20);
await FlutterPcmSound.feed(PcmArrayInt16.fromList(frame));
}
await FlutterPcmSound.setup(sampleRate: 44100, channelCount: 1);
await FlutterPcmSound.setFeedThreshold(8000);
FlutterPcmSound.setFeedCallback(onFeed);
FlutterPcmSound.start(); // just invokes your feed callbackPlease star this repo & on pub.dev. We all benefit from having a larger community.
Enable the platforms you need.
cd ./example
flutter config --enable-macos-desktop
flutter config --enable-android
flutter config --enable-ios
flutter create .
flutter run