Play an audio from an arraybuffer of bytes? - html

Question

I Have a bufferarray comes from a rest endpoint I have created with Java that returns a byte[] array ; so I managed to get the array with HTTP (I am using Angular) now I want to play the audio in the browser. I have done some research and I found the web audio API but the error is that I can not decode the array.
context = new AudioContext();
audioArray : ArrayBuffer;
buf ;
let arrayBuffer = new ArrayBuffer(this.audioArray.byteLength);
let bufferView = new Uint8Array(arrayBuffer);
for (let i = 0; i < this.audioArray.byteLength; i++) {
bufferView[i] = this.audioArray[i];
}
console.log(arrayBuffer);
// this function should decode the array but the error occurs
// DOMException: Unable to decode audio data
this.context.decodeAudioData(this.audioArray).then((buffer)=>{
this.buf = buffer;
this.play();
}).catch((error)=>{
console.log(error);
});
console.log(this.audioArray);
play() {
let source = this.context.createBufferSource();
source.buffer = this.buf;
source.connect(this.context.destination);
source.start(0);
}
And I am getting the array in ngOnInit function by calling the rest API:)
this.radioService.generateVoiceMethode().subscribe(res => {
console.log(res);
this.audioArray = new ArrayBuffer(res.byteLength);
this.audioArray = res;
console.log(this.audioArray);
});

Answer 1

Though this is an old question, I am sharing an answer that worked for me. May be useful for some one in the future.
async play(data: ArrayBuffer) {
const context = new AudioContext();
const buffer = await context.decodeAudioData(data);
const source = context.createBufferSource();
source.buffer = buffer;
source.connect(context.destination);
source.start();
}
The code above works in Angular 8.