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