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fix: Improved audio quality of radio

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Pax1601 2025-03-24 23:03:28 +01:00
parent eff96ce0c2
commit 9fc1519ef6
1 changed files with 42 additions and 9 deletions
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51
frontend/react/src/audio/playbackpipeline.ts
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@ -33,19 +33,41 @@ export class PlaybackPipeline {
/* Connect to the device audio output */
this.#gainNode = getApp().getAudioManager().getAudioContext().createGain();
this.#gainNode.gain.value = 40;// apply gain to get clipping
const volumeNode = getApp().getAudioManager().getAudioContext().createGain();
volumeNode.gain.value = 0.1; // Lower output volume to prevent feedback
this.#pannerNode = getApp().getAudioManager().getAudioContext().createStereoPanner();
let splitter = getApp().getAudioManager().getAudioContext().createChannelSplitter();
let bandpass = new Filter(getApp().getAudioManager().getAudioContext(), "banpass", 600, 10);
bandpass.setup();
mediaStreamSource.connect(this.#gainNode);
this.#gainNode.connect(bandpass.input);
bandpass.output.connect(splitter);
splitter.connect(this.#pannerNode);
// Bandpass filter for low frequency cutoff at 520 Hz same as SRS
let bandpassLow = new Filter(getApp().getAudioManager().getAudioContext(), "bandpass", 520, 0.25);
bandpassLow.setup();
// Bandpass filter for high frequency cutoff at 4130 Hz same as SRS
let bandpassHigh = new Filter(getApp().getAudioManager().getAudioContext(), "bandpass", 5000, 0.3);
bandpassHigh.setup();
// Distortion effect
let distortion = getApp().getAudioManager().getAudioContext().createWaveShaper();
distortion.curve = this.#createDistortionCurve(2); // Customize curve for harshness
distortion.oversample = '4x';
/* // Connect the media stream source to the filters and distortion
mediaStreamSource.connect(this.#gainNode);
this.#gainNode.connect(this.#pannerNode);
this.#pannerNode.pan.setValueAtTime(0, getApp().getAudioManager().getAudioContext().currentTime); */
mediaStreamSource.connect(this.#gainNode);
this.#gainNode.connect(bandpassHigh.input);
//bandpassLow.output.connect(bandpassHigh.input);
bandpassHigh.output.connect(volumeNode); // Control volume to prevent feedback
volumeNode.connect(this.#pannerNode); // Route to panner
this.#pannerNode.pan.setValueAtTime(0, getApp().getAudioManager().getAudioContext().currentTime);
let noise = new Noise(getApp().getAudioManager().getAudioContext(), 0.01);
let noise = new Noise(getApp().getAudioManager().getAudioContext(), 0.02); // Slightly louder static
noise.init();
noise.connect(this.#gainNode);
}
@ -60,8 +82,8 @@ export class PlaybackPipeline {
};
//@ts-ignore //TODO Typings?
let encodedAudioChunk = new EncodedAudioChunk(init);
this.#decoder.decode(encodedAudioChunk);
this.#decoder.decode(encodedAudioChunk);
}
setEnabled(enabled) {
@ -83,4 +105,15 @@ export class PlaybackPipeline {
this.#writer.write(audioData);
});
}
#createDistortionCurve(amount) {
let n_samples = 44100;
let curve = new Float32Array(n_samples);
let deg = Math.PI / 180;
for (let i = 0; i < n_samples; ++i) {
let x = (i * 2) / n_samples - 1;
curve[i] = ((3 + amount) * x * 20 * deg) / (Math.PI + amount * Math.abs(x));
}
return curve;
}
}