godot/platform/javascript/audio_driver_javascript.cpp
Fabio Alessandrelli b800438efb [HTML5] Use browser mix rate by default on the Web.
Browsers doesn't really like forcing the mix rate, e.g. Firefox does not
allow input (microphone) if the mix rate is not the default one, Chrom*
will exhibit worse performances, etc.
2021-09-15 20:36:19 +02:00

286 lines
8.9 KiB
C++

/*************************************************************************/
/* audio_driver_javascript.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 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 */
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/*************************************************************************/
#include "audio_driver_javascript.h"
#include "core/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.start(_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();
}
#endif