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Diffstat (limited to 'platform/javascript/js/libs/audio.worklet.js')
| -rw-r--r-- | platform/javascript/js/libs/audio.worklet.js | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/platform/javascript/js/libs/audio.worklet.js b/platform/javascript/js/libs/audio.worklet.js new file mode 100644 index 0000000000..a27035ef22 --- /dev/null +++ b/platform/javascript/js/libs/audio.worklet.js @@ -0,0 +1,186 @@ +/*************************************************************************/ +/* audio.worklet.js */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ + +class RingBuffer { + constructor(p_buffer, p_state) { + this.buffer = p_buffer; + this.avail = p_state; + this.rpos = 0; + this.wpos = 0; + } + + data_left() { + return Atomics.load(this.avail, 0); + } + + space_left() { + return this.buffer.length - this.data_left(); + } + + read(output) { + const size = this.buffer.length; + let from = 0; + let to_write = output.length; + if (this.rpos + to_write > size) { + const high = size - this.rpos; + output.set(this.buffer.subarray(this.rpos, size)); + from = high; + to_write -= high; + this.rpos = 0; + } + output.set(this.buffer.subarray(this.rpos, this.rpos + to_write), from); + this.rpos += to_write; + Atomics.add(this.avail, 0, -output.length); + Atomics.notify(this.avail, 0); + } + + write(p_buffer) { + const to_write = p_buffer.length; + const mw = this.buffer.length - this.wpos; + if (mw >= to_write) { + this.buffer.set(p_buffer, this.wpos); + } else { + const high = p_buffer.subarray(0, to_write - mw); + const low = p_buffer.subarray(to_write - mw); + this.buffer.set(high, this.wpos); + this.buffer.set(low); + } + let diff = to_write; + if (this.wpos + diff >= this.buffer.length) { + diff -= this.buffer.length; + } + this.wpos += diff; + Atomics.add(this.avail, 0, to_write); + Atomics.notify(this.avail, 0); + } +} + +class GodotProcessor extends AudioWorkletProcessor { + constructor() { + super(); + this.running = true; + this.lock = null; + this.notifier = null; + this.output = null; + this.output_buffer = new Float32Array(); + this.input = null; + this.input_buffer = new Float32Array(); + this.port.onmessage = (event) => { + const cmd = event.data['cmd']; + const data = event.data['data']; + this.parse_message(cmd, data); + }; + } + + process_notify() { + Atomics.add(this.notifier, 0, 1); + Atomics.notify(this.notifier, 0); + } + + parse_message(p_cmd, p_data) { + if (p_cmd === "start" && p_data) { + const state = p_data[0]; + let idx = 0; + this.lock = state.subarray(idx, ++idx); + this.notifier = state.subarray(idx, ++idx); + const avail_in = state.subarray(idx, ++idx); + const avail_out = state.subarray(idx, ++idx); + this.input = new RingBuffer(p_data[1], avail_in); + this.output = new RingBuffer(p_data[2], avail_out); + } else if (p_cmd === "stop") { + this.runing = false; + this.output = null; + this.input = null; + } + } + + static array_has_data(arr) { + return arr.length && arr[0].length && arr[0][0].length; + } + + process(inputs, outputs, parameters) { + if (!this.running) { + return false; // Stop processing. + } + if (this.output === null) { + return true; // Not ready yet, keep processing. + } + const process_input = GodotProcessor.array_has_data(inputs); + if (process_input) { + const input = inputs[0]; + const chunk = input[0].length * input.length; + if (this.input_buffer.length !== chunk) { + this.input_buffer = new Float32Array(chunk); + } + if (this.input.space_left() >= chunk) { + GodotProcessor.write_input(this.input_buffer, input); + this.input.write(this.input_buffer); + } else { + this.port.postMessage("Input buffer is full! Skipping input frame."); + } + } + const process_output = GodotProcessor.array_has_data(outputs); + if (process_output) { + const output = outputs[0]; + const chunk = output[0].length * output.length; + if (this.output_buffer.length !== chunk) { + this.output_buffer = new Float32Array(chunk); + } + if (this.output.data_left() >= chunk) { + this.output.read(this.output_buffer); + GodotProcessor.write_output(output, this.output_buffer); + } else { + this.port.postMessage("Output buffer has not enough frames! Skipping output frame."); + } + } + this.process_notify(); + return true; + } + + static write_output(dest, source) { + const channels = dest.length; + for (let ch = 0; ch < channels; ch++) { + for (let sample = 0; sample < dest[ch].length; sample++) { + dest[ch][sample] = source[sample * channels + ch]; + } + } + } + + static write_input(dest, source) { + const channels = source.length; + for (let ch = 0; ch < channels; ch++) { + for (let sample = 0; sample < source[ch].length; sample++) { + dest[sample * channels + ch] = source[ch][sample]; + } + } + } +} + +registerProcessor('godot-processor', GodotProcessor); |