将PCM16音频转换为WAV并编码为Base64：浏览器环境下的手动处理指南

const sampleRate = 48000; // 假设采样率为48kHz，请根据实际SDK返回的采样率设置
const length = pcm16Audio.length; // pcm16Audio是Int16Array，其长度即为样本数

const audioBuffer = new AudioBuffer({
    length: length,
    sampleRate: sampleRate,
    numberOfChannels: 1 // 假设是单声道，如果是双声道则设置为2
});

const channelData = new Float32Array(length);

for (let i = 0; i < length; i += 1) {
    const int16 = pcm16Audio[i]; // 从SDK获取的Int16Array数据
    const f32 = int16 < 0 ? int16 / 32768 : int16 / 32767;
    channelData[i] = f32;
}

audioBuffer.copyFromChannel(channelData, 0); // 假设是单声道，复制到第一个通道（索引为0）

// 假设这是你的SDK提供的获取PCM16数据的方法
async function getRecordedAudioPcm16Samples() {
    // ... SDK内部逻辑，返回一个Int16Array
    // 示例：
    const numRecordedSamples = 48000; // 假设1秒钟的48kHz单声道数据
    let audio = new Int16Array(numRecordedSamples);
    for (let i = 0; i < numRecordedSamples; i++) {
        audio[i] = Math.sin(i * 0.1) * 10000; // 模拟一些PCM16数据
    }
    return audio;
}

const pcm16Audio = await getRecordedAudioPcm16Samples();

const audioContext = new (window.AudioContext || window.webkitAudioContext)();
const sampleRate = audioContext.sampleRate; // 使用AudioContext的默认采样率，或者SDK提供的采样率
const length = pcm16Audio.length;

const audioBuffer = new AudioBuffer({
    length: length,
    sampleRate: sampleRate,
    numberOfChannels: 1 // 假设为单声道
});

const channelData = new Float32Array(length);
for (let i = 0; i < length; i += 1) {
    const int16 = pcm16Audio[i];
    const f32 = int16 < 0 ? int16 / 32768 : int16 / 32767;
    channelData[i] = f32;
}
audioBuffer.copyFromChannel(channelData, 0);

import toWav from 'audiobuffer-to-wav';

const wavArrayBuffer = toWav(audioBuffer);
// wavArrayBuffer 现在是一个包含WAV文件二进制数据的ArrayBuffer

function arrayBufferToBase64(buffer) {
    return new Promise((resolve, reject) => {
        const blob = new Blob([buffer], { type: 'audio/wav' });
        const reader = new FileReader();
        reader.onload = () => {
            // result会是"data:audio/wav;base64,..."这样的格式
            // 我们通常只需要"base64,"之后的部分
            const base64String = reader.result.split(',')[1];
            resolve(base64String);
        };
        reader.onerror = error => reject(error);
        reader.readAsDataURL(blob);
    });
}

const base64Wav = await arrayBufferToBase64(wavArrayBuffer);
console.log('Base64 WAV String:', base64Wav);
// 现在你可以将 base64Wav 发送到API了

import toWav from 'audiobuffer-to-wav';

// 模拟SDK获取PCM16数据的方法
async function getRecordedAudioPcm16Samples() {
    // 假设获取1秒钟的48kHz单声道PCM16数据
    const sampleRate = 48000;
    const durationSeconds = 1;
    const numRecordedSamples = sampleRate * durationSeconds;

    let audio = new Int16Array(numRecordedSamples);
    // 模拟一个简单的正弦波
    for (let i = 0; i < numRecordedSamples; i++) {
        audio[i] = Math.sin(2 * Math.PI * 440 * (i / sampleRate)) * 10000; // 440Hz正弦波，幅度10000
    }
    return audio;
}

// 将ArrayBuffer转换为Base64字符串的辅助函数
function arrayBufferToBase64(buffer) {
    return new Promise((resolve, reject) => {
        const blob = new Blob([buffer], { type: 'audio/wav' });
        const reader = new FileReader();
        reader.onload = () => {
            const base64String = reader.result.split(',')[1];
            resolve(base64String);
        };
        reader.onerror = error => reject(error);
        reader.readAsDataURL(blob);
    });
}

async function convertPcm16ToWavBase64() {
    try {
        // 1. 获取原始 PCM16 音频样本
        const pcm16Audio = await getRecordedAudioPcm16Samples();

        // 2. 初始化 AudioContext 并构建 AudioBuffer
        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
        // 确保这里的sampleRate与SDK输出的PCM16数据的实际采样率一致
        // 如果SDK不提供，可能需要硬编码或从其他配置中获取
        const actualSampleRate = 48000; // 假设SDK返回的PCM16是48kHz
        const length = pcm16Audio.length;

        const audioBuffer = new AudioBuffer({
            length: length,
            sampleRate: actualSampleRate,
            numberOfChannels: 1 // 假设为单声道
        });

        const channelData = new Float32Array(length);
        for (let i = 0; i < length; i += 1) {
            const int16 = pcm16Audio[i];
            const f32 = int16 < 0 ? int16 / 32768 : int16 / 32767;
            channelData[i] = f32;
        }
        audioBuffer.copyFromChannel(channelData, 0);

        // 3. 将 AudioBuffer 转换为 WAV ArrayBuffer
        const wavArrayBuffer = toWav(audioBuffer);

        // 4. 将 WAV ArrayBuffer 转换为 Base64 字符串
        const base64Wav = await arrayBufferToBase64(wavArrayBuffer);

        console.log('转换成功！');
        console.log('Base64 WAV 字符串 (前100字符):', base64Wav.substring(0, 100) + '...');
        return base64Wav;

    } catch (error) {
        console.error('转换过程中发生错误:', error);
    }
}

// 调用主函数
convertPcm16ToWavBase64();