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Sound support for Javascript (untested).

This commit is contained in:
Juan Linietsky 2017-10-26 22:34:49 -03:00
parent b1b11ea411
commit b8ac700046
2 changed files with 92 additions and 3 deletions
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79
platform/javascript/audio_driver_javascript.cpp
View File

@ -29,6 +29,7 @@
/*************************************************************************/
#include "audio_driver_javascript.h"
#include <emscripten.h>
#include <string.h>
#define MAX_NUMBER_INTERFACES 3
@ -38,22 +39,91 @@
//AudioDriverJavaScript* AudioDriverJavaScript::s_ad=NULL;
AudioDriverJavaScript *AudioDriverJavaScript::singleton_js = NULL;
const char *AudioDriverJavaScript::get_name() const {
return "JavaScript";
}
extern "C" {
void js_audio_driver_mix_function(int p_frames) {
//print_line("MIXI! "+itos(p_frames));
AudioDriverJavaScript::singleton_js->mix_to_js(p_frames);
}
}
void AudioDriverJavaScript::mix_to_js(int p_frames) {
int todo = p_frames;
int offset = 0;
while (todo) {
int tomix = MIN(todo, INTERNAL_BUFFER_SIZE);
audio_server_process(p_frames, stream_buffer);
for (int i = 0; i < tomix * internal_buffer_channels; i++) {
internal_buffer[i] = float(stream_buffer[i] >> 16) * 32768.0;
}
/* clang-format off */
EM_ASM_({
var data = HEAPF32.subarray($0 / 4, $0 / 4 + $2 * 2);
for (var channel = 0; channel < _as_output_buffer.numberOfChannels; channel++) {
var outputData = _as_output_buffer.getChannelData(channel);
// Loop through samples
for (var sample = 0; sample < $2; sample++) {
// make output equal to the same as the input
outputData[sample + $1] = data[sample * 2 + channel];
}
}
}, internal_buffer, offset, tomix);
/* clang-format on */
todo -= tomix;
offset += tomix;
}
}
Error AudioDriverJavaScript::init() {
return OK;
}
void AudioDriverJavaScript::start() {
internal_buffer_channels = 2;
internal_buffer = memnew_arr(float, INTERNAL_BUFFER_SIZE *internal_buffer_channels);
stream_buffer = memnew_arr(int32_t, INTERNAL_BUFFER_SIZE * 4); //max 4 channels
/* clang-format off */
EM_ASM(
_as_audioctx = new (window.AudioContext || window.webkitAudioContext)();
audio_server_mix_function = Module.cwrap('js_audio_driver_mix_function', 'void', ['number']);
);
int buffer_latency = 16384;
EM_ASM_( {
_as_script_node = _as_audioctx.createScriptProcessor($0, 0, 2);
_as_script_node.connect(_as_audioctx.destination);
console.log(_as_script_node.bufferSize);
_as_script_node.onaudioprocess = function(audioProcessingEvent) {
// The output buffer contains the samples that will be modified and played
_as_output_buffer = audioProcessingEvent.outputBuffer;
audio_server_mix_function(_as_output_buffer.getChannelData(0).length);
}
}, buffer_latency);
/* clang-format on */
}
int AudioDriverJavaScript::get_mix_rate() const {
return 44100;
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
@ -63,7 +133,7 @@ AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
void AudioDriverJavaScript::lock() {
/*
/*no locking, as threads are not supported
if (active && mutex)
mutex->lock();
*/
@ -71,7 +141,7 @@ void AudioDriverJavaScript::lock() {
void AudioDriverJavaScript::unlock() {
/*
/*no locking, as threads are not supported
if (active && mutex)
mutex->unlock();
*/
@ -81,4 +151,7 @@ void AudioDriverJavaScript::finish() {
}
AudioDriverJavaScript::AudioDriverJavaScript() {
mix_rate = 44100;
singleton_js = this;
}

16
platform/javascript/audio_driver_javascript.h
View File

@ -35,7 +35,23 @@
#include "os/mutex.h"
class AudioDriverJavaScript : public AudioDriver {
enum {
INTERNAL_BUFFER_SIZE = 4096,
STREAM_SCALE_BITS = 12
};
int mix_rate;
float *internal_buffer;
int internal_buffer_channels;
int internal_buffer_size;
int32_t *stream_buffer;
public:
void mix_to_js(int p_frames);
static AudioDriverJavaScript *singleton_js;
virtual const char *get_name() const;
virtual Error init();