144 lines
5.0 KiB
C++
144 lines
5.0 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) 2007-2018 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2018 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_js = NULL;
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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 js_audio_driver_mix_function(int p_frames) {
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//print_line("MIXI! "+itos(p_frames));
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AudioDriverJavaScript::singleton_js->mix_to_js(p_frames);
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}
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void AudioDriverJavaScript::mix_to_js(int p_frames) {
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int todo = p_frames;
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int offset = 0;
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while (todo) {
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int tomix = MIN(todo, INTERNAL_BUFFER_SIZE);
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audio_server_process(p_frames, stream_buffer);
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for (int i = 0; i < tomix * internal_buffer_channels; i++) {
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internal_buffer[i] = float(stream_buffer[i] >> 16) / 32768.0;
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}
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/* clang-format off */
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EM_ASM_ARGS({
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var data = HEAPF32.subarray($0 / 4, $0 / 4 + $2 * 2);
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for (var channel = 0; channel < _as_output_buffer.numberOfChannels; channel++) {
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var outputData = _as_output_buffer.getChannelData(channel);
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// Loop through samples
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for (var sample = 0; sample < $2; sample++) {
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// make output equal to the same as the input
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outputData[sample + $1] = data[sample * 2 + channel];
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}
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}
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}, internal_buffer, offset, tomix);
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/* clang-format on */
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todo -= tomix;
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offset += tomix;
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}
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}
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Error AudioDriverJavaScript::init() {
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return OK;
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}
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void AudioDriverJavaScript::start() {
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internal_buffer = memnew_arr(float, INTERNAL_BUFFER_SIZE *internal_buffer_channels);
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stream_buffer = memnew_arr(int32_t, INTERNAL_BUFFER_SIZE * 4); //max 4 channels
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/* clang-format off */
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mix_rate = EM_ASM_INT({
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_as_audioctx = new (window.AudioContext || window.webkitAudioContext);
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_as_script_node = _as_audioctx.createScriptProcessor($0, 0, $1);
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_as_script_node.connect(_as_audioctx.destination);
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console.log(_as_script_node.bufferSize);
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var jsAudioDriverMixFunction = cwrap('js_audio_driver_mix_function', null, ['number']);
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_as_script_node.onaudioprocess = function(audioProcessingEvent) {
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// The output buffer contains the samples that will be modified and played
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_as_output_buffer = audioProcessingEvent.outputBuffer;
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jsAudioDriverMixFunction([_as_output_buffer.getChannelData(0).length]);
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};
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return _as_audioctx.sampleRate;
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}, INTERNAL_BUFFER_SIZE, internal_buffer_channels);
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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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return mix_rate;
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}
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AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
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return SPEAKER_MODE_STEREO;
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}
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void AudioDriverJavaScript::lock() {
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/*no locking, as threads are not supported
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if (active && mutex)
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mutex->lock();
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*/
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}
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void AudioDriverJavaScript::unlock() {
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/*no locking, as threads are not supported
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if (active && mutex)
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mutex->unlock();
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*/
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}
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void AudioDriverJavaScript::finish() {
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}
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AudioDriverJavaScript::AudioDriverJavaScript() {
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internal_buffer_channels = 2;
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mix_rate = DEFAULT_MIX_RATE;
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singleton_js = this;
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}
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