116 lines
4 KiB
JavaScript
116 lines
4 KiB
JavaScript
"use strict";
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let opusscript_native_nasm = null;
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let opusscript_native_wasm = null;
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var OpusApplication = {
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VOIP: 2048,
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AUDIO: 2049,
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RESTRICTED_LOWDELAY: 2051
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};
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var OpusError = {
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"0": "OK",
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"-1": "Bad argument",
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"-2": "Buffer too small",
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"-3": "Internal error",
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"-4": "Invalid packet",
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"-5": "Unimplemented",
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"-6": "Invalid state",
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"-7": "Memory allocation fail"
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};
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var VALID_SAMPLING_RATES = [8000, 12000, 16000, 24000, 48000];
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var MAX_FRAME_SIZE = 48000 * 60 / 1000;
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var MAX_PACKET_SIZE = 1276 * 3;
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function OpusScript(samplingRate, channels, application, options) {
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if(!~VALID_SAMPLING_RATES.indexOf(samplingRate)) {
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throw new RangeError(`${samplingRate} is an invalid sampling rate.`);
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}
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this.options = Object.assign({
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wasm: true
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}, options);
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this.samplingRate = samplingRate;
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this.channels = channels || 1;
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this.application = application || OpusApplication.AUDIO;
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let opusscript_native = null;
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if(this.options.wasm) {
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if(!opusscript_native_wasm) {
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opusscript_native_wasm = require("./build/opusscript_native_wasm.js")();
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}
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opusscript_native = opusscript_native_wasm;
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} else {
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if(!opusscript_native_nasm) {
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opusscript_native_nasm = require("./build/opusscript_native_nasm.js")();
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}
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opusscript_native = opusscript_native_nasm;
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}
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this.handler = new opusscript_native.OpusScriptHandler(this.samplingRate, this.channels, this.application);
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this.inPCMLength = MAX_FRAME_SIZE * this.channels * 2;
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this.inPCMPointer = opusscript_native._malloc(this.inPCMLength);
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this.inPCM = opusscript_native.HEAPU16.subarray(this.inPCMPointer, this.inPCMPointer + this.inPCMLength);
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this.inOpusPointer = opusscript_native._malloc(MAX_PACKET_SIZE);
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this.inOpus = opusscript_native.HEAPU8.subarray(this.inOpusPointer, this.inOpusPointer + MAX_PACKET_SIZE);
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this.outOpusPointer = opusscript_native._malloc(MAX_PACKET_SIZE);
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this.outOpus = opusscript_native.HEAPU8.subarray(this.outOpusPointer, this.outOpusPointer + MAX_PACKET_SIZE);
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this.outPCMLength = MAX_FRAME_SIZE * this.channels * 2;
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this.outPCMPointer = opusscript_native._malloc(this.outPCMLength);
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this.outPCM = opusscript_native.HEAPU16.subarray(this.outPCMPointer, this.outPCMPointer + this.outPCMLength);
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};
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OpusScript.prototype.encode = function encode(buffer, frameSize) {
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this.inPCM.set(buffer);
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var len = this.handler._encode(this.inPCM.byteOffset, buffer.length, this.outOpusPointer, frameSize);
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if(len < 0) {
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throw new Error("Encode error: " + OpusError["" + len]);
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}
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return Buffer.from(this.outOpus.subarray(0, len));
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};
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OpusScript.prototype.decode = function decode(buffer) {
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this.inOpus.set(buffer);
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var len = this.handler._decode(this.inOpusPointer, buffer.length, this.outPCM.byteOffset);
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if(len < 0) {
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throw new Error("Decode error: " + OpusError["" + len]);
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}
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return Buffer.from(this.outPCM.subarray(0, len * this.channels * 2));
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};
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OpusScript.prototype.encoderCTL = function encoderCTL(ctl, arg) {
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var len = this.handler._encoder_ctl(ctl, arg);
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if(len < 0) {
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throw new Error("Encoder CTL error: " + OpusError["" + len]);
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}
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};
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OpusScript.prototype.decoderCTL = function decoderCTL(ctl, arg) {
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var len = this.handler._decoder_ctl(ctl, arg);
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if(len < 0) {
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throw new Error("Decoder CTL error: " + OpusError["" + len]);
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}
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};
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OpusScript.prototype.delete = function del() {
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let opusscript_native = this.options.wasm ? opusscript_native_wasm : opusscript_native_nasm;
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opusscript_native.OpusScriptHandler.destroy_handler(this.handler);
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opusscript_native._free(this.inPCMPointer);
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opusscript_native._free(this.inOpusPointer);
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opusscript_native._free(this.outOpusPointer);
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opusscript_native._free(this.outPCMPointer);
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};
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OpusScript.Application = OpusApplication;
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OpusScript.Error = OpusError;
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OpusScript.VALID_SAMPLING_RATES = VALID_SAMPLING_RATES;
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OpusScript.MAX_PACKET_SIZE = MAX_PACKET_SIZE;
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module.exports = OpusScript;
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