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Fix for accelerated audio in stereo WAV #391

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merged 2 commits into from
Sep 25, 2024
Merged

Fix for accelerated audio in stereo WAV #391

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6107a29
Problem: accelerated audio
F4310 Sep 25, 2024
c63e0ed
Merge branch 'play_sound' of https://github.com/F4310/wire-pod into p…
F4310 Sep 25, 2024
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36 changes: 29 additions & 7 deletions chipper/webroot/js/play_audio.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,18 +16,40 @@ document.getElementById('fileInput').addEventListener('change', async () => {

try {
const audioBuffer = await audioContext.decodeAudioData(arrayBuffer);

let newBuffer;

//Verify is audio is stereio or mono and convert to mono if necessary
if(audioBuffer.numberOfChannels >1){
const monoLength = audioBuffer.length;
newBuffer = audioContext.createBuffer(1, monoLength, audioBuffer.sampleRate);

const channelData = newBuffer.getChannelData(0);
for (let i = 0; i < monoLength; i++){

channelData[i] = 0.5 * (audioBuffer.getChannelData(0)[i] + audioBuffer.getChannelData(1)[i]);


}

}else{
// if already mono, just copy
newBuffer = audioBuffer;
}



// adjust frame rate to 8000 Hz
const newSampleRate = 8000;
const newLength = Math.round(audioBuffer.length * newSampleRate / audioBuffer.sampleRate);
const newBuffer = audioContext.createBuffer(audioBuffer.numberOfChannels, newLength, newSampleRate);
const newLength = Math.round(newBuffer.length * newSampleRate / newBuffer.sampleRate);
const resampledBuffer = audioContext.createBuffer(newBuffer.numberOfChannels, newLength, newSampleRate);

for (let channel = 0; channel < audioBuffer.numberOfChannels; channel++) {
const oldData = audioBuffer.getChannelData(channel);
const newData = newBuffer.getChannelData(channel);
for (let channel = 0; channel < newBuffer.numberOfChannels; channel++) {
const oldData = newBuffer.getChannelData(channel);
const newData = resampledBuffer .getChannelData(channel);

for (let i = 0; i < newLength; i++) {
const oldIndex = i * audioBuffer.sampleRate / newSampleRate;
const oldIndex = i * newBuffer.sampleRate / newSampleRate;
const index0 = Math.floor(oldIndex);
const index1 = Math.min(index0 + 1, oldData.length - 1);
const fraction = oldIndex - index0;
Expand All @@ -37,7 +59,7 @@ document.getElementById('fileInput').addEventListener('change', async () => {
}

// Create a new WAV file
processedAudioBlob = await bufferToWave(newBuffer);
processedAudioBlob = await bufferToWave(resampledBuffer );
const url = URL.createObjectURL(processedAudioBlob);

// play processed audio
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