283 lines
8.9 KiB
C++
283 lines
8.9 KiB
C++
/*************************************************************************/
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/* audio_driver_javascript.cpp */
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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) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 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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#include "audio_driver_javascript.h"
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#include <emscripten.h>
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AudioDriverJavaScript *AudioDriverJavaScript::singleton = nullptr;
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const char *AudioDriverJavaScript::get_name() const {
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return "JavaScript";
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}
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extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_js_mix() {
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AudioDriverJavaScript::singleton->mix_to_js();
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}
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extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_process_capture(float sample) {
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AudioDriverJavaScript::singleton->process_capture(sample);
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}
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void AudioDriverJavaScript::mix_to_js() {
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int channel_count = get_total_channels_by_speaker_mode(get_speaker_mode());
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int sample_count = memarr_len(internal_buffer) / channel_count;
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int32_t *stream_buffer = reinterpret_cast<int32_t *>(internal_buffer);
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audio_server_process(sample_count, stream_buffer);
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for (int i = 0; i < sample_count * channel_count; i++) {
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internal_buffer[i] = float(stream_buffer[i] >> 16) / 32768.f;
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}
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}
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void AudioDriverJavaScript::process_capture(float sample) {
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int32_t sample32 = int32_t(sample * 32768.f) * (1U << 16);
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input_buffer_write(sample32);
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}
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Error AudioDriverJavaScript::init() {
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/* clang-format off */
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_driver_id = EM_ASM_INT({
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return Module.IDHandler.add({
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'context': new (window.AudioContext || window.webkitAudioContext),
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'input': null,
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'stream': null,
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'script': null
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});
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});
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/* clang-format on */
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int channel_count = get_total_channels_by_speaker_mode(get_speaker_mode());
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/* clang-format off */
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buffer_length = EM_ASM_INT({
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var ref = Module.IDHandler.get($0);
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var ctx = ref['context'];
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var CHANNEL_COUNT = $1;
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var channelCount = ctx.destination.channelCount;
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var script = null;
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try {
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// Try letting the browser recommend a buffer length.
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script = ctx.createScriptProcessor(0, 2, channelCount);
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} catch (e) {
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// ...otherwise, default to 4096.
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script = ctx.createScriptProcessor(4096, 2, channelCount);
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}
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script.connect(ctx.destination);
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ref['script'] = script;
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return script.bufferSize;
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}, _driver_id, channel_count);
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/* clang-format on */
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if (!buffer_length) {
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return FAILED;
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}
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if (!internal_buffer || (int)memarr_len(internal_buffer) != buffer_length * channel_count) {
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if (internal_buffer)
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memdelete_arr(internal_buffer);
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internal_buffer = memnew_arr(float, buffer_length *channel_count);
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}
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return internal_buffer ? OK : ERR_OUT_OF_MEMORY;
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}
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void AudioDriverJavaScript::start() {
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/* clang-format off */
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EM_ASM({
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const ref = Module.IDHandler.get($0);
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var INTERNAL_BUFFER_PTR = $1;
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var audioDriverMixFunction = cwrap('audio_driver_js_mix');
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var audioDriverProcessCapture = cwrap('audio_driver_process_capture', null, ['number']);
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ref['script'].onaudioprocess = function(audioProcessingEvent) {
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audioDriverMixFunction();
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var input = audioProcessingEvent.inputBuffer;
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var output = audioProcessingEvent.outputBuffer;
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var internalBuffer = HEAPF32.subarray(
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INTERNAL_BUFFER_PTR / HEAPF32.BYTES_PER_ELEMENT,
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INTERNAL_BUFFER_PTR / HEAPF32.BYTES_PER_ELEMENT + output.length * output.numberOfChannels);
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for (var channel = 0; channel < output.numberOfChannels; channel++) {
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var outputData = output.getChannelData(channel);
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// Loop through samples.
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for (var sample = 0; sample < outputData.length; sample++) {
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outputData[sample] = internalBuffer[sample * output.numberOfChannels + channel];
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}
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}
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if (ref['input']) {
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var inputDataL = input.getChannelData(0);
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var inputDataR = input.getChannelData(1);
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for (var i = 0; i < inputDataL.length; i++) {
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audioDriverProcessCapture(inputDataL[i]);
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audioDriverProcessCapture(inputDataR[i]);
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}
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}
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};
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}, _driver_id, internal_buffer);
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/* clang-format on */
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}
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void AudioDriverJavaScript::resume() {
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/* clang-format off */
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EM_ASM({
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const ref = Module.IDHandler.get($0);
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if (ref && ref['context'] && ref['context'].resume)
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ref['context'].resume();
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}, _driver_id);
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/* clang-format on */
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}
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int AudioDriverJavaScript::get_mix_rate() const {
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/* clang-format off */
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return EM_ASM_INT({
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const ref = Module.IDHandler.get($0);
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return ref && ref['context'] ? ref['context'].sampleRate : 0;
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}, _driver_id);
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/* clang-format on */
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}
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AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
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/* clang-format off */
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return get_speaker_mode_by_total_channels(EM_ASM_INT({
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const ref = Module.IDHandler.get($0);
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return ref && ref['context'] ? ref['context'].destination.channelCount : 0;
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}, _driver_id));
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/* clang-format on */
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}
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// No locking, as threads are not supported.
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void AudioDriverJavaScript::lock() {
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}
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void AudioDriverJavaScript::unlock() {
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}
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void AudioDriverJavaScript::finish_async() {
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// Close the context, add the operation to the async_finish list in module.
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int id = _driver_id;
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_driver_id = 0;
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/* clang-format off */
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EM_ASM({
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var ref = Module.IDHandler.get($0);
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Module.async_finish.push(new Promise(function(accept, reject) {
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if (!ref) {
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console.log("Ref not found!", $0, Module.IDHandler);
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setTimeout(accept, 0);
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} else {
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const context = ref['context'];
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// Disconnect script and input.
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ref['script'].disconnect();
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if (ref['input'])
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ref['input'].disconnect();
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ref = null;
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context.close().then(function() {
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accept();
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}).catch(function(e) {
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accept();
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});
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}
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}));
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Module.IDHandler.remove($0);
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}, id);
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/* clang-format on */
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}
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void AudioDriverJavaScript::finish() {
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if (internal_buffer) {
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memdelete_arr(internal_buffer);
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internal_buffer = nullptr;
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}
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}
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Error AudioDriverJavaScript::capture_start() {
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input_buffer_init(buffer_length);
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/* clang-format off */
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EM_ASM({
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function gotMediaInput(stream) {
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var ref = Module.IDHandler.get($0);
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ref['stream'] = stream;
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ref['input'] = ref['context'].createMediaStreamSource(stream);
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ref['input'].connect(ref['script']);
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}
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function gotMediaInputError(e) {
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out(e);
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}
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if (navigator.mediaDevices.getUserMedia) {
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navigator.mediaDevices.getUserMedia({"audio": true}).then(gotMediaInput, gotMediaInputError);
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} else {
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if (!navigator.getUserMedia)
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navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
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navigator.getUserMedia({"audio": true}, gotMediaInput, gotMediaInputError);
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}
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}, _driver_id);
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/* clang-format on */
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return OK;
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}
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Error AudioDriverJavaScript::capture_stop() {
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/* clang-format off */
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EM_ASM({
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var ref = Module.IDHandler.get($0);
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if (ref['stream']) {
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const tracks = ref['stream'].getTracks();
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for (var i = 0; i < tracks.length; i++) {
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tracks[i].stop();
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}
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ref['stream'] = null;
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}
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if (ref['input']) {
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ref['input'].disconnect();
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ref['input'] = null;
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}
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}, _driver_id);
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/* clang-format on */
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input_buffer.clear();
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return OK;
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}
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AudioDriverJavaScript::AudioDriverJavaScript() {
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_driver_id = 0;
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internal_buffer = nullptr;
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buffer_length = 0;
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singleton = this;
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}
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