246334b836
Performances are not great in general, bad on Firefox, on Chrome, well, it could be an improvement. Leave it as a fallback for now, but can be forced via project settings if desired (or custom JavaScript logic via the "args" option). I'm actually surprised this works, it involves so many allocations, but there's no way around it when SharedArrayBuffer is not available :(.
212 lines
7 KiB
JavaScript
212 lines
7 KiB
JavaScript
/*************************************************************************/
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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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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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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} 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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