58 lines
2.0 KiB
JavaScript
58 lines
2.0 KiB
JavaScript
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"use strict";
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const savePCMBuffer = async (pcmArrayBuffer, voiceList) => {
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const sampleRate = 16e3;
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const channels = 1;
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const bitDepth = 16;
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const wavArrayBuffer = pcmToWav(pcmArrayBuffer, sampleRate, channels, bitDepth);
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const FileSystemManager = wx.getFileSystemManager();
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const dateNow = Date.now();
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const savePath = `${wx.env.USER_DATA_PATH}/${dateNow}.wav`;
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try {
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await new Promise((resolve, reject) => {
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FileSystemManager.writeFile({
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data: wavArrayBuffer,
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filePath: savePath,
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success: resolve,
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fail: reject
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});
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});
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if (voiceList) {
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voiceList.push(savePath);
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}
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} catch (error) {
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console.error("Failed to save WAV file:", error);
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}
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};
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const pcmToWav = (pcmArrayBuffer, sampleRate, channels, bitDepth) => {
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const chunkSize = 36 + pcmArrayBuffer.byteLength;
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const subChunk1Size = 16;
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const audioFormat = 1;
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const byteRate = sampleRate * channels * (bitDepth / 8);
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const blockAlign = channels * (bitDepth / 8);
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const wavArrayBuffer = new ArrayBuffer(chunkSize + 8 + pcmArrayBuffer.byteLength);
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const wavView = new DataView(wavArrayBuffer);
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writeString(wavView, 0, "RIFF");
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wavView.setUint32(4, chunkSize, true);
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writeString(wavView, 8, "WAVE");
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writeString(wavView, 12, "fmt ");
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wavView.setUint32(16, subChunk1Size, true);
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wavView.setUint16(20, audioFormat, true);
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wavView.setUint16(22, channels, true);
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wavView.setUint32(24, sampleRate, true);
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wavView.setUint32(28, byteRate, true);
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wavView.setUint16(32, blockAlign, true);
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wavView.setUint16(34, bitDepth, true);
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writeString(wavView, 36, "data");
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wavView.setUint32(40, pcmArrayBuffer.byteLength, true);
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const pcmView = new Uint8Array(pcmArrayBuffer);
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const wavPcmView = new Uint8Array(wavArrayBuffer, 44);
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wavPcmView.set(pcmView);
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return wavArrayBuffer;
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};
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const writeString = (view, offset, string) => {
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for (let i = 0; i < string.length; i++) {
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view.setUint8(offset + i, string.charCodeAt(i));
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}
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};
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exports.savePCMBuffer = savePCMBuffer;
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