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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);
- input_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 || 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 */
- }
- 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) {
- console.log(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;
- }
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