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/*************************************************************************/
/* audio_driver_javascript.cpp */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#include "audio_driver_javascript.h"
#include "core/project_settings.h"
#include "godot_audio.h"
#include <emscripten.h>
AudioDriverJavaScript *AudioDriverJavaScript::singleton = nullptr;
bool AudioDriverJavaScript::is_available() {
return godot_audio_is_available() != 0;
}
const char *AudioDriverJavaScript::get_name() const {
return "JavaScript";
}
#ifndef NO_THREADS
void AudioDriverJavaScript::_audio_thread_func(void *p_data) {
AudioDriverJavaScript *obj = static_cast<AudioDriverJavaScript *>(p_data);
while (!obj->quit) {
obj->lock();
if (!obj->needs_process) {
obj->unlock();
OS::get_singleton()->delay_usec(1000); // Give the browser some slack.
continue;
}
obj->_js_driver_process();
obj->needs_process = false;
obj->unlock();
}
}
#endif
extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_process_start() {
#ifndef NO_THREADS
AudioDriverJavaScript::singleton->lock();
#else
AudioDriverJavaScript::singleton->_js_driver_process();
#endif
}
extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_process_end() {
#ifndef NO_THREADS
AudioDriverJavaScript::singleton->needs_process = true;
AudioDriverJavaScript::singleton->unlock();
#endif
}
extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_process_capture(float sample) {
AudioDriverJavaScript::singleton->process_capture(sample);
}
void AudioDriverJavaScript::_js_driver_process() {
int sample_count = memarr_len(internal_buffer) / channel_count;
int32_t *stream_buffer = reinterpret_cast<int32_t *>(internal_buffer);
audio_server_process(sample_count, stream_buffer);
for (int i = 0; i < sample_count * channel_count; i++) {
internal_buffer[i] = float(stream_buffer[i] >> 16) / 32768.f;
}
}
void AudioDriverJavaScript::process_capture(float sample) {
int32_t sample32 = int32_t(sample * 32768.f) * (1U << 16);
input_buffer_write(sample32);
}
Error AudioDriverJavaScript::init() {
mix_rate = GLOBAL_GET("audio/mix_rate");
int latency = GLOBAL_GET("audio/output_latency");
channel_count = godot_audio_init(mix_rate, latency);
buffer_length = closest_power_of_2((latency * mix_rate / 1000) * channel_count);
buffer_length = godot_audio_create_processor(buffer_length, channel_count);
if (!buffer_length) {
return FAILED;
}
if (!internal_buffer || (int)memarr_len(internal_buffer) != buffer_length * channel_count) {
if (internal_buffer)
memdelete_arr(internal_buffer);
internal_buffer = memnew_arr(float, buffer_length *channel_count);
}
if (!internal_buffer) {
return ERR_OUT_OF_MEMORY;
}
return OK;
}
void AudioDriverJavaScript::start() {
#ifndef NO_THREADS
thread = Thread::create(_audio_thread_func, this);
#endif
godot_audio_start(internal_buffer);
}
void AudioDriverJavaScript::resume() {
godot_audio_resume();
}
float AudioDriverJavaScript::get_latency() {
return godot_audio_get_latency();
}
int AudioDriverJavaScript::get_mix_rate() const {
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
return get_speaker_mode_by_total_channels(channel_count);
}
void AudioDriverJavaScript::lock() {
#ifndef NO_THREADS
mutex.lock();
#endif
}
void AudioDriverJavaScript::unlock() {
#ifndef NO_THREADS
mutex.unlock();
#endif
}
void AudioDriverJavaScript::finish_async() {
#ifndef NO_THREADS
quit = true; // Ask thread to quit.
#endif
godot_audio_finish_async();
}
void AudioDriverJavaScript::finish() {
#ifndef NO_THREADS
Thread::wait_to_finish(thread);
memdelete(thread);
thread = NULL;
#endif
if (internal_buffer) {
memdelete_arr(internal_buffer);
internal_buffer = nullptr;
}
}
Error AudioDriverJavaScript::capture_start() {
godot_audio_capture_stop();
input_buffer_init(buffer_length);
godot_audio_capture_start();
return OK;
}
Error AudioDriverJavaScript::capture_stop() {
input_buffer.clear();
return OK;
}
AudioDriverJavaScript::AudioDriverJavaScript() {
singleton = this;
}
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