godot/platform/javascript/audio_driver_javascript.cpp
Fabio Alessandrelli 92031098bf Move mixrate and latency definition to AudioServer
Each driver used to define the (same) project settings value, but the
setting names are not driver specific. Ovverriding is still possible via
platform tags.

(cherry picked from commit 90c7102b51)
2020-05-18 16:40:33 +02:00

278 lines
8.6 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/project_settings.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);
input_buffer_write(sample32);
}
Error AudioDriverJavaScript::init() {
int mix_rate = GLOBAL_GET("audio/mix_rate");
int latency = GLOBAL_GET("audio/output_latency");
/* clang-format off */
EM_ASM({
const MIX_RATE = $0;
const LATENCY = $1;
_audioDriver_audioContext = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: MIX_RATE, latencyHint: LATENCY});
_audioDriver_audioInput = null;
_audioDriver_inputStream = null;
_audioDriver_scriptNode = null;
}, mix_rate, latency);
/* clang-format on */
int channel_count = get_total_channels_by_speaker_mode(get_speaker_mode());
buffer_length = closest_power_of_2((latency * mix_rate / 1000) * channel_count);
/* clang-format off */
buffer_length = EM_ASM_INT({
const BUFFER_LENGTH = $0;
const CHANNEL_COUNT = $1;
_audioDriver_scriptNode = _audioDriver_audioContext.createScriptProcessor(BUFFER_LENGTH, 2, CHANNEL_COUNT);
_audioDriver_scriptNode.connect(_audioDriver_audioContext.destination);
return _audioDriver_scriptNode.bufferSize;
}, buffer_length, 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 */
}
float AudioDriverJavaScript::get_latency() {
/* clang-format off */
return EM_ASM_DOUBLE({
var latency = 0;
if (_audioDriver_audioContext) {
if (_audioDriver_audioContext.baseLatency) {
latency += _audioDriver_audioContext.baseLatency;
}
if (_audioDriver_audioContext.outputLatency) {
latency += _audioDriver_audioContext.outputLatency;
}
}
return latency;
});
/* 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() {
input_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 */
input_buffer.clear();
return OK;
}
AudioDriverJavaScript::AudioDriverJavaScript() {
internal_buffer = NULL;
singleton = this;
}