214 lines
7 KiB
JavaScript
214 lines
7 KiB
JavaScript
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/**************************************************************************/
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/* audio.worklet.js */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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class RingBuffer {
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constructor(p_buffer, p_state, p_threads) {
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this.buffer = p_buffer;
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this.avail = p_state;
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this.threads = p_threads;
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this.rpos = 0;
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this.wpos = 0;
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}
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data_left() {
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return this.threads ? Atomics.load(this.avail, 0) : this.avail;
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}
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space_left() {
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return this.buffer.length - this.data_left();
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}
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read(output) {
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const size = this.buffer.length;
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let from = 0;
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let to_write = output.length;
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if (this.rpos + to_write > size) {
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const high = size - this.rpos;
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output.set(this.buffer.subarray(this.rpos, size));
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from = high;
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to_write -= high;
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this.rpos = 0;
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}
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if (to_write) {
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output.set(this.buffer.subarray(this.rpos, this.rpos + to_write), from);
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}
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this.rpos += to_write;
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if (this.threads) {
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Atomics.add(this.avail, 0, -output.length);
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Atomics.notify(this.avail, 0);
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} else {
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this.avail -= output.length;
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}
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}
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write(p_buffer) {
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const to_write = p_buffer.length;
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const mw = this.buffer.length - this.wpos;
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if (mw >= to_write) {
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this.buffer.set(p_buffer, this.wpos);
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this.wpos += to_write;
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if (mw === to_write) {
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this.wpos = 0;
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}
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} else {
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const high = p_buffer.subarray(0, mw);
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const low = p_buffer.subarray(mw);
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this.buffer.set(high, this.wpos);
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this.buffer.set(low);
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this.wpos = low.length;
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}
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if (this.threads) {
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Atomics.add(this.avail, 0, to_write);
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Atomics.notify(this.avail, 0);
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} else {
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this.avail += to_write;
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}
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}
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}
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class GodotProcessor extends AudioWorkletProcessor {
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constructor() {
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super();
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this.threads = false;
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this.running = true;
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this.lock = null;
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this.notifier = null;
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this.output = null;
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this.output_buffer = new Float32Array();
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this.input = null;
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this.input_buffer = new Float32Array();
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this.port.onmessage = (event) => {
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const cmd = event.data['cmd'];
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const data = event.data['data'];
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this.parse_message(cmd, data);
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};
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}
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process_notify() {
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if (this.notifier) {
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Atomics.add(this.notifier, 0, 1);
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Atomics.notify(this.notifier, 0);
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}
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}
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parse_message(p_cmd, p_data) {
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if (p_cmd === 'start' && p_data) {
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const state = p_data[0];
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let idx = 0;
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this.threads = true;
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this.lock = state.subarray(idx, ++idx);
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this.notifier = state.subarray(idx, ++idx);
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const avail_in = state.subarray(idx, ++idx);
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const avail_out = state.subarray(idx, ++idx);
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this.input = new RingBuffer(p_data[1], avail_in, true);
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this.output = new RingBuffer(p_data[2], avail_out, true);
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} else if (p_cmd === 'stop') {
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this.running = false;
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this.output = null;
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this.input = null;
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this.lock = null;
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this.notifier = null;
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} else if (p_cmd === 'start_nothreads') {
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this.output = new RingBuffer(p_data[0], p_data[0].length, false);
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} else if (p_cmd === 'chunk') {
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this.output.write(p_data);
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}
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}
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static array_has_data(arr) {
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return arr.length && arr[0].length && arr[0][0].length;
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}
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process(inputs, outputs, parameters) {
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if (!this.running) {
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return false; // Stop processing.
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}
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if (this.output === null) {
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return true; // Not ready yet, keep processing.
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}
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const process_input = GodotProcessor.array_has_data(inputs);
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if (process_input) {
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const input = inputs[0];
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const chunk = input[0].length * input.length;
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if (this.input_buffer.length !== chunk) {
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this.input_buffer = new Float32Array(chunk);
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}
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if (!this.threads) {
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GodotProcessor.write_input(this.input_buffer, input);
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this.port.postMessage({ 'cmd': 'input', 'data': this.input_buffer });
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} else if (this.input.space_left() >= chunk) {
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GodotProcessor.write_input(this.input_buffer, input);
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this.input.write(this.input_buffer);
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} else {
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this.port.postMessage('Input buffer is full! Skipping input frame.');
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}
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}
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const process_output = GodotProcessor.array_has_data(outputs);
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if (process_output) {
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const output = outputs[0];
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const chunk = output[0].length * output.length;
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if (this.output_buffer.length !== chunk) {
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this.output_buffer = new Float32Array(chunk);
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}
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if (this.output.data_left() >= chunk) {
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this.output.read(this.output_buffer);
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GodotProcessor.write_output(output, this.output_buffer);
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if (!this.threads) {
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this.port.postMessage({ 'cmd': 'read', 'data': chunk });
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}
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} else {
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this.port.postMessage('Output buffer has not enough frames! Skipping output frame.');
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}
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}
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this.process_notify();
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return true;
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}
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static write_output(dest, source) {
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const channels = dest.length;
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for (let ch = 0; ch < channels; ch++) {
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for (let sample = 0; sample < dest[ch].length; sample++) {
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dest[ch][sample] = source[sample * channels + ch];
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}
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}
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}
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static write_input(dest, source) {
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const channels = source.length;
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for (let ch = 0; ch < channels; ch++) {
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for (let sample = 0; sample < source[ch].length; sample++) {
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dest[sample * channels + ch] = source[ch][sample];
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}
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}
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}
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}
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registerProcessor('godot-processor', GodotProcessor);
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