Method constructor

src/audio_data.ts:71–123

(init: AudioDataInit | Frame)

	constructor(init: Frame);
	constructor(init: AudioDataInit);
	constructor(init: AudioDataInit | Frame) {
		if (init instanceof Frame) {
			const format = toAudioSampleFormat(init.format as AVSampleFormat);
			if (!format) {
				throw new TypeError('Unsupported audio sample format: ' + init.format);
			}

			this.format = format;
			this.sampleRate = init.sampleRate;
			this.numberOfFrames = init.nbSamples;
			this.numberOfChannels = init.channels;
			this.timestamp = Number(init.pts);
			this.duration = Number(init.duration);

			this._data = init;
		} else {
			if (!Number.isFinite(init.sampleRate) || init.sampleRate <= 0) {
				throw new TypeError('Invalid AudioDataInit: sampleRate must be > 0.');
			}
			if (!Number.isInteger(init.numberOfChannels) || init.numberOfChannels <= 0) {
				throw new TypeError('Invalid AudioDataInit: numberOfChannels must be an integer > 0.');
			}
			// Spec: numberOfFrames is required and must be > 0
			if (!Number.isInteger(init.numberOfFrames) || init.numberOfFrames <= 0) {
				throw new TypeError('Invalid AudioDataInit: numberOfFrames must be an integer > 0.');
			}
			if (!Number.isFinite(init?.timestamp)) {
				throw new TypeError('init.timestamp must be a number.');
			}

			this.format = init.format;
			this.sampleRate = init.sampleRate;
			this.numberOfFrames = init.numberOfFrames;
			this.numberOfChannels = init.numberOfChannels;
			this.timestamp = Math.trunc(init.timestamp);
			this.duration = Math.floor(1e6 * this.numberOfFrames / init.sampleRate);

			const dataBuffer = toUint8Array(init.data);

			// Spec: Verify data has enough data.
			const expectedSize
				= this.numberOfFrames * this.numberOfChannels * getBytesPerSample(this.format);

			if (dataBuffer.byteLength < expectedSize) {
				throw new TypeError('Invalid AudioDataInit: insufficient data size.');
			}

			this._data = dataBuffer as Uint8Array<ArrayBuffer>;
		}

		finalizationRegistry.register(this, this._data instanceof Frame ? this._data : null, this);
		openAudioDataCount++;
	}

	private ensureNotClosed() {
		if (this.closed) {