@audc/libsamplerate/index.js

Native bindings for libsamplerate

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.SRC_LINEAR = exports.SRC_ZERO_ORDER_HOLD = exports.SRC_SINC_FASTEST = exports.SRC_SINC_MEDIUM_QUALITY = exports.SRC_SINC_BEST_QUALITY = exports.SampleRate = void 0;
const stream_1 = require("stream");
const bindings_1 = __importDefault(require("bindings"));
const { SampleRateStream } = (0, bindings_1.default)('node-libsamplerate');
let defaultOpts = {
    type: 2,
    channels: 2,
    fromRate: 48000,
    fromDepth: 16,
    toRate: 44100,
    toDepth: 16
};
class SampleRate extends stream_1.Transform {
    _samplerate;
    constructor(opts) {
        opts ||= defaultOpts;
        if (!(opts.fromDepth == 16 || opts.fromDepth == 32))
            throw new Error('Invalid source bit depth');
        if (!(opts.toDepth == 16 || opts.toDepth == 32))
            throw new Error('Invalid target bit depth');
        super(opts);
        this._samplerate = new SampleRateStream(opts);
    }
    setRatio(ratio) {
        this._samplerate.setRatio(ratio);
    }
    _final(cb) {
        process.nextTick(() => {
            this._samplerate.reset();
        });
        cb();
    }
    _transform(chunk, _encoding, cb) {
        this.push(this._samplerate.transform(chunk));
        cb();
    }
}
exports.SampleRate = SampleRate;
exports.SRC_SINC_BEST_QUALITY = 0;
exports.SRC_SINC_MEDIUM_QUALITY = 1;
exports.SRC_SINC_FASTEST = 2;
exports.SRC_ZERO_ORDER_HOLD = 3;
exports.SRC_LINEAR = 4;
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