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/*************************************************************************/
/* audio_driver_javascript.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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 = NULL;
const char *AudioDriverJavaScript::get_name() const {
return "JavaScript";
}
extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_js_mix() {
AudioDriverJavaScript::singleton->mix_to_js();
}
extern "C" EMSCRIPTEN_KEEPALIVE void audio_driver_process_capture(float sample) {
AudioDriverJavaScript::singleton->process_capture(sample);
}
void AudioDriverJavaScript::mix_to_js() {
int channel_count = get_total_channels_by_speaker_mode(get_speaker_mode());
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);
capture_buffer_write(sample32);
}
Error AudioDriverJavaScript::init() {
/* clang-format off */
EM_ASM({
_audioDriver_audioContext = new (window.AudioContext || window.webkitAudioContext);
_audioDriver_audioInput = null;
_audioDriver_inputStream = null;
_audioDriver_scriptNode = null;
});
/* clang-format on */
int channel_count = get_total_channels_by_speaker_mode(get_speaker_mode());
/* clang-format off */
buffer_length = EM_ASM_INT({
var CHANNEL_COUNT = $0;
var channelCount = _audioDriver_audioContext.destination.channelCount;
try {
// Try letting the browser recommend a buffer length.
_audioDriver_scriptNode = _audioDriver_audioContext.createScriptProcessor(0, 2, channelCount);
} catch (e) {
// ...otherwise, default to 4096.
_audioDriver_scriptNode = _audioDriver_audioContext.createScriptProcessor(4096, 2, channelCount);
}
_audioDriver_scriptNode.connect(_audioDriver_audioContext.destination);
return _audioDriver_scriptNode.bufferSize;
}, channel_count);
/* clang-format on */
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);
}
return internal_buffer ? OK : ERR_OUT_OF_MEMORY;
}
void AudioDriverJavaScript::start() {
/* clang-format off */
EM_ASM({
var INTERNAL_BUFFER_PTR = $0;
var audioDriverMixFunction = cwrap('audio_driver_js_mix');
var audioDriverProcessCapture = cwrap('audio_driver_process_capture', null, ['number']);
_audioDriver_scriptNode.onaudioprocess = function(audioProcessingEvent) {
audioDriverMixFunction();
var input = audioProcessingEvent.inputBuffer;
var output = audioProcessingEvent.outputBuffer;
var internalBuffer = HEAPF32.subarray(
INTERNAL_BUFFER_PTR / HEAPF32.BYTES_PER_ELEMENT,
INTERNAL_BUFFER_PTR / HEAPF32.BYTES_PER_ELEMENT + output.length * output.numberOfChannels);
for (var channel = 0; channel < output.numberOfChannels; channel++) {
var outputData = output.getChannelData(channel);
// Loop through samples.
for (var sample = 0; sample < outputData.length; sample++) {
outputData[sample] = internalBuffer[sample * output.numberOfChannels + channel];
}
}
if (_audioDriver_audioInput) {
var inputDataL = input.getChannelData(0);
var inputDataR = input.getChannelData(1);
for (var i = 0; i < inputDataL.length; i++) {
audioDriverProcessCapture(inputDataL[i]);
audioDriverProcessCapture(inputDataR[i]);
}
}
};
}, internal_buffer);
/* clang-format on */
}
void AudioDriverJavaScript::resume() {
/* clang-format off */
EM_ASM({
if (_audioDriver_audioContext.resume)
_audioDriver_audioContext.resume();
});
/* clang-format on */
}
int AudioDriverJavaScript::get_mix_rate() const {
/* clang-format off */
return EM_ASM_INT_V({
return _audioDriver_audioContext.sampleRate;
});
/* clang-format on */
}
AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
/* clang-format off */
return get_speaker_mode_by_total_channels(EM_ASM_INT_V({
return _audioDriver_audioContext.destination.channelCount;
}));
/* clang-format on */
}
// No locking, as threads are not supported.
void AudioDriverJavaScript::lock() {
}
void AudioDriverJavaScript::unlock() {
}
void AudioDriverJavaScript::finish() {
/* clang-format off */
EM_ASM({
_audioDriver_audioContext = null;
_audioDriver_audioInput = null;
_audioDriver_scriptNode = null;
});
/* clang-format on */
if (internal_buffer) {
memdelete_arr(internal_buffer);
internal_buffer = NULL;
}
}
Error AudioDriverJavaScript::capture_start() {
capture_buffer_init(buffer_length);
/* clang-format off */
EM_ASM({
function gotMediaInput(stream) {
_audioDriver_inputStream = stream;
_audioDriver_audioInput = _audioDriver_audioContext.createMediaStreamSource(stream);
_audioDriver_audioInput.connect(_audioDriver_scriptNode);
}
function gotMediaInputError(e) {
out(e);
}
if (navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia({"audio": true}).then(gotMediaInput, gotMediaInputError);
} else {
if (!navigator.getUserMedia)
navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
navigator.getUserMedia({"audio": true}, gotMediaInput, gotMediaInputError);
}
});
/* clang-format on */
return OK;
}
Error AudioDriverJavaScript::capture_stop() {
/* clang-format off */
EM_ASM({
if (_audioDriver_inputStream) {
const tracks = _audioDriver_inputStream.getTracks();
for (var i = 0; i < tracks.length; i++) {
tracks[i].stop();
}
_audioDriver_inputStream = null;
}
if (_audioDriver_audioInput) {
_audioDriver_audioInput.disconnect();
_audioDriver_audioInput = null;
}
});
/* clang-format on */
return OK;
}
AudioDriverJavaScript::AudioDriverJavaScript() {
internal_buffer = NULL;
singleton = this;
}
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