59 lines
1.8 KiB
TypeScript
59 lines
1.8 KiB
TypeScript
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function createWavHeader(
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dataLength: number,
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sampleRate: number,
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channels: number,
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bitDepth: number,
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): Uint8Array {
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const header = new Uint8Array(44);
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const view = new DataView(header.buffer);
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// RIFF header
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header.set([0x52, 0x49, 0x46, 0x46], 0); // "RIFF"
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view.setUint32(4, 36 + dataLength, true); // File size - 8 bytes
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header.set([0x57, 0x41, 0x56, 0x45], 8); // "WAVE"
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// Format chunk
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header.set([0x66, 0x6d, 0x74, 0x20], 12); // "fmt "
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view.setUint32(16, 16, true); // Format chunk size
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view.setUint16(20, 1, true); // Audio format (PCM)
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view.setUint16(22, channels, true); // Number of channels
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view.setUint32(24, sampleRate, true); // Sample rate
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view.setUint32(28, sampleRate * channels * (bitDepth / 8), true); // Byte rate
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view.setUint16(32, channels * (bitDepth / 8), true); // Block align
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view.setUint16(34, bitDepth, true); // Bits per sample
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// Data chunk
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header.set([0x64, 0x61, 0x74, 0x61], 36); // "data"
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view.setUint32(40, dataLength, true); // Data size
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return header;
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}
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export function pcmToWavBlob(
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pcmData: Uint8Array,
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sampleRate: number = 44100,
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bitDepth: number = 16,
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channels: number = 1,
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): Blob {
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const header = createWavHeader(pcmData.length, sampleRate, channels, bitDepth);
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const wavData = new Uint8Array(header.length + pcmData.length);
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wavData.set(header, 0);
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wavData.set(pcmData, header.length);
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return new Blob([wavData], { type: 'audio/wav' });
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}
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export function pcmToWavArray(
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pcmData: Uint8Array,
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sampleRate: number = 44100,
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bitDepth: number = 16,
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channels: number = 1,
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): Uint8Array {
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const header = createWavHeader(pcmData.length, sampleRate, channels, bitDepth);
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const wavData = new Uint8Array(header.length + pcmData.length);
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wavData.set(header, 0);
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wavData.set(pcmData, header.length);
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return wavData;
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}
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