1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*************************************************************************/
/* audio_driver_javascript.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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_js = NULL;
const char *AudioDriverJavaScript::get_name() const {
return "JavaScript";
}
extern "C" EMSCRIPTEN_KEEPALIVE 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_ARGS({
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 = 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 */
mix_rate = EM_ASM_INT({
_as_audioctx = new (window.AudioContext || window.webkitAudioContext);
_as_script_node = _as_audioctx.createScriptProcessor($0, 0, $1);
_as_script_node.connect(_as_audioctx.destination);
console.log(_as_script_node.bufferSize);
var jsAudioDriverMixFunction = cwrap('js_audio_driver_mix_function', null, ['number']);
_as_script_node.onaudioprocess = function(audioProcessingEvent) {
// The output buffer contains the samples that will be modified and played
_as_output_buffer = audioProcessingEvent.outputBuffer;
jsAudioDriverMixFunction([_as_output_buffer.getChannelData(0).length]);
};
return _as_audioctx.sampleRate;
}, INTERNAL_BUFFER_SIZE, internal_buffer_channels);
/* clang-format on */
}
int AudioDriverJavaScript::get_mix_rate() const {
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverJavaScript::get_speaker_mode() const {
return SPEAKER_MODE_STEREO;
}
void AudioDriverJavaScript::lock() {
/*no locking, as threads are not supported
if (active && mutex)
mutex->lock();
*/
}
void AudioDriverJavaScript::unlock() {
/*no locking, as threads are not supported
if (active && mutex)
mutex->unlock();
*/
}
void AudioDriverJavaScript::finish() {
}
AudioDriverJavaScript::AudioDriverJavaScript() {
internal_buffer_channels = 2;
mix_rate = DEFAULT_MIX_RATE;
singleton_js = this;
}
|