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/**
* Copyright 2024 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const AudioRecordingWorklet = `
class AudioProcessingWorklet extends AudioWorkletProcessor {
// send and clear buffer every 2048 samples,
// which at 16khz is about 8 times a second
buffer = new Int16Array(2048);
// current write index
bufferWriteIndex = 0;
constructor() {
super();
this.hasAudio = false;
}
/**
* @param inputs Float32Array[][] [input#][channel#][sample#] so to access first inputs 1st channel inputs[0][0]
* @param outputs Float32Array[][]
*/
process(inputs) {
if (inputs[0].length) {
const channel0 = inputs[0][0];
this.processChunk(channel0);
}
return true;
}
sendAndClearBuffer(){
this.port.postMessage({
event: "chunk",
data: {
int16arrayBuffer: this.buffer.slice(0, this.bufferWriteIndex).buffer,
},
});
this.bufferWriteIndex = 0;
}
processChunk(float32Array) {
const l = float32Array.length;
for (let i = 0; i < l; i++) {
// convert float32 -1 to 1 to int16 -32768 to 32767
const int16Value = float32Array[i] * 32768;
this.buffer[this.bufferWriteIndex++] = int16Value;
if(this.bufferWriteIndex >= this.buffer.length) {
this.sendAndClearBuffer();
}
}
if(this.bufferWriteIndex >= this.buffer.length) {
this.sendAndClearBuffer();
}
}
}
`;
export default AudioRecordingWorklet;
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