js 生成单声道 pcm

// 生成单声道PCM音频数据
function generateMonoPCMAudioData(sampleRate, duration, bitDepth) {
    const numSamples = sampleRate * duration;
    const buffer = new ArrayBuffer(numSamples * (bitDepth / 8));
    const dataView = new DataView(buffer);

    for (let i = 0; i < numSamples; i++) {
        const sampleValue = Math.sin(2 * Math.PI * 440 * i / sampleRate); // 440 Hz sine wave
        let sample;

        switch (bitDepth) {
            case 8:
                sample = Math.max(-128, Math.min(127, Math.floor(sampleValue * 127)));
                dataView.setInt8(i, sample);
                break;
            case 16:
                sample = Math.max(-32768, Math.min(32767, Math.floor(sampleValue * 32767)));
                dataView.setInt16(i * 2, sample, true);
                break;
            case 32:
                sample = Math.max(-2147483648, Math.min(2147483647, Math.floor(sampleValue * 2147483647)));
                dataView.setFloat32(i * 4, sample, true);
                break;
            default:
                throw new Error('Unsupported bit depth');
        }
    }

    return buffer;
}

// 使用示例
const sampleRate = 44100; // 采样率
const duration = 1; // 持续时间（秒）
const bitDepth = 16; // 位深度

const audioData = generateMonoPCMAudioData(sampleRate, duration, bitDepth);
console.log(audioData);