godot/platform/javascript/audio_driver_javascript.cpp
2020-12-09 17:54:50 +01:00

288 lines
8.9 KiB
C++

/*************************************************************************/
/* 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/config/project_settings.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";
}
void AudioDriverJavaScript::_state_change_callback(int p_state) {
singleton->state = p_state;
}
void AudioDriverJavaScript::_latency_update_callback(float p_latency) {
singleton->output_latency = p_latency;
}
void AudioDriverJavaScript::_audio_driver_process(int p_from, int p_samples) {
int32_t *stream_buffer = reinterpret_cast<int32_t *>(output_rb);
const int max_samples = memarr_len(output_rb);
int write_pos = p_from;
int to_write = p_samples;
if (to_write == 0) {
to_write = max_samples;
}
// High part
if (write_pos + to_write > max_samples) {
const int samples_high = max_samples - write_pos;
audio_server_process(samples_high / channel_count, &stream_buffer[write_pos]);
for (int i = write_pos; i < max_samples; i++) {
output_rb[i] = float(stream_buffer[i] >> 16) / 32768.f;
}
to_write -= samples_high;
write_pos = 0;
}
// Leftover
audio_server_process(to_write / channel_count, &stream_buffer[write_pos]);
for (int i = write_pos; i < write_pos + to_write; i++) {
output_rb[i] = float(stream_buffer[i] >> 16) / 32768.f;
}
}
void AudioDriverJavaScript::_audio_driver_capture(int p_from, int p_samples) {
if (get_input_buffer().size() == 0) {
return; // Input capture stopped.
}
const int max_samples = memarr_len(input_rb);
int read_pos = p_from;
int to_read = p_samples;
if (to_read == 0) {
to_read = max_samples;
}
// High part
if (read_pos + to_read > max_samples) {
const int samples_high = max_samples - read_pos;
for (int i = read_pos; i < max_samples; i++) {
input_buffer_write(int32_t(input_rb[i] * 32768.f) * (1U << 16));
}
to_read -= samples_high;
read_pos = 0;
}
// Leftover
for (int i = read_pos; i < read_pos + to_read; i++) {
input_buffer_write(int32_t(input_rb[i] * 32768.f) * (1U << 16));
}
}
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, &_state_change_callback, &_latency_update_callback);
buffer_length = closest_power_of_2((latency * mix_rate / 1000));
#ifndef NO_THREADS
node = memnew(WorkletNode);
#else
node = memnew(ScriptProcessorNode);
#endif
buffer_length = node->create(buffer_length, channel_count);
if (output_rb) {
memdelete_arr(output_rb);
}
output_rb = memnew_arr(float, buffer_length *channel_count);
if (!output_rb) {
return ERR_OUT_OF_MEMORY;
}
if (input_rb) {
memdelete_arr(input_rb);
}
input_rb = memnew_arr(float, buffer_length *channel_count);
if (!input_rb) {
return ERR_OUT_OF_MEMORY;
}
return OK;
}
void AudioDriverJavaScript::start() {
if (node) {
node->start(output_rb, memarr_len(output_rb), input_rb, memarr_len(input_rb));
}
}
void AudioDriverJavaScript::resume() {
if (state == 0) { // 'suspended'
godot_audio_resume();
}
}
float AudioDriverJavaScript::get_latency() {
return output_latency + (float(buffer_length) / mix_rate);
}
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() {
if (node) {
node->unlock();
}
}
void AudioDriverJavaScript::unlock() {
if (node) {
node->unlock();
}
}
void AudioDriverJavaScript::finish() {
if (node) {
node->finish();
memdelete(node);
node = nullptr;
}
if (output_rb) {
memdelete_arr(output_rb);
output_rb = nullptr;
}
if (input_rb) {
memdelete_arr(input_rb);
input_rb = nullptr;
}
}
Error AudioDriverJavaScript::capture_start() {
lock();
input_buffer_init(buffer_length);
unlock();
if (godot_audio_capture_start()) {
return FAILED;
}
return OK;
}
Error AudioDriverJavaScript::capture_stop() {
godot_audio_capture_stop();
lock();
input_buffer.clear();
unlock();
return OK;
}
AudioDriverJavaScript::AudioDriverJavaScript() {
singleton = this;
}
#ifdef NO_THREADS
/// ScriptProcessorNode implementation
void AudioDriverJavaScript::ScriptProcessorNode::_process_callback() {
AudioDriverJavaScript::singleton->_audio_driver_capture();
AudioDriverJavaScript::singleton->_audio_driver_process();
}
int AudioDriverJavaScript::ScriptProcessorNode::create(int p_buffer_samples, int p_channels) {
return godot_audio_script_create(p_buffer_samples, p_channels);
}
void AudioDriverJavaScript::ScriptProcessorNode::start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) {
godot_audio_script_start(p_in_buf, p_in_buf_size, p_out_buf, p_out_buf_size, &_process_callback);
}
#else
/// AudioWorkletNode implementation
void AudioDriverJavaScript::WorkletNode::_audio_thread_func(void *p_data) {
AudioDriverJavaScript::WorkletNode *obj = static_cast<AudioDriverJavaScript::WorkletNode *>(p_data);
AudioDriverJavaScript *driver = AudioDriverJavaScript::singleton;
const int out_samples = memarr_len(driver->output_rb);
const int in_samples = memarr_len(driver->input_rb);
int wpos = 0;
int to_write = out_samples;
int rpos = 0;
int to_read = 0;
int32_t step = 0;
while (!obj->quit) {
if (to_read) {
driver->lock();
driver->_audio_driver_capture(rpos, to_read);
godot_audio_worklet_state_add(obj->state, STATE_SAMPLES_IN, -to_read);
driver->unlock();
rpos += to_read;
if (rpos >= in_samples) {
rpos -= in_samples;
}
}
if (to_write) {
driver->lock();
driver->_audio_driver_process(wpos, to_write);
godot_audio_worklet_state_add(obj->state, STATE_SAMPLES_OUT, to_write);
driver->unlock();
wpos += to_write;
if (wpos >= out_samples) {
wpos -= out_samples;
}
}
step = godot_audio_worklet_state_wait(obj->state, STATE_PROCESS, step, 1);
to_write = out_samples - godot_audio_worklet_state_get(obj->state, STATE_SAMPLES_OUT);
to_read = godot_audio_worklet_state_get(obj->state, STATE_SAMPLES_IN);
}
}
int AudioDriverJavaScript::WorkletNode::create(int p_buffer_size, int p_channels) {
godot_audio_worklet_create(p_channels);
return p_buffer_size;
}
void AudioDriverJavaScript::WorkletNode::start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) {
godot_audio_worklet_start(p_in_buf, p_in_buf_size, p_out_buf, p_out_buf_size, state);
thread = Thread::create(_audio_thread_func, this);
}
void AudioDriverJavaScript::WorkletNode::lock() {
mutex.lock();
}
void AudioDriverJavaScript::WorkletNode::unlock() {
mutex.unlock();
}
void AudioDriverJavaScript::WorkletNode::finish() {
quit = true; // Ask thread to quit.
Thread::wait_to_finish(thread);
memdelete(thread);
thread = nullptr;
}
#endif