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comparison chiptune2.js @ 6:ac2f9715807c

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first version
author Paper <mrpapersonic@gmail.com>
date Sun, 30 May 2021 18:07:38 -0400
parents
children 8f0b52a3cb69
comparison
equal deleted inserted replaced
3:f13aa00c92f0 6:ac2f9715807c
1 // constants
2 const OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT = 2
3 const OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH = 1
4
5 // audio context
6 var ChiptuneAudioContext = window['AudioContext'] || window['webkitAudioContext'];
7
8 // config
9 var ChiptuneJsConfig = function (repeatCount, stereoSeparation, interpolationFilter, context)
10 {
11 this.repeatCount = repeatCount;
12 this.stereoSeparation = stereoSeparation;
13 this.interpolationFilter = interpolationFilter;
14 this.context = context;
15 }
16
17 ChiptuneJsConfig.prototype.constructor = ChiptuneJsConfig;
18
19 // player
20 var ChiptuneJsPlayer = function (config) {
21 this.config = config;
22 this.context = config.context || new ChiptuneAudioContext();
23 this.currentPlayingNode = null;
24 this.handlers = [];
25 this.touchLocked = true;
26 }
27
28 ChiptuneJsPlayer.prototype.constructor = ChiptuneJsPlayer;
29
30 // event handlers section
31 ChiptuneJsPlayer.prototype.fireEvent = function (eventName, response) {
32 var handlers = this.handlers;
33 if (handlers.length) {
34 handlers.forEach(function (handler) {
35 if (handler.eventName === eventName) {
36 handler.handler(response);
37 }
38 })
39 }
40 }
41
42 ChiptuneJsPlayer.prototype.addHandler = function (eventName, handler) {
43 this.handlers.push({eventName: eventName, handler: handler});
44 }
45
46 ChiptuneJsPlayer.prototype.onEnded = function (handler) {
47 this.addHandler('onEnded', handler);
48 }
49
50 ChiptuneJsPlayer.prototype.onError = function (handler) {
51 this.addHandler('onError', handler);
52 }
53
54 // metadata
55 ChiptuneJsPlayer.prototype.duration = function() {
56 return libopenmpt._openmpt_module_get_duration_seconds(this.currentPlayingNode.modulePtr);
57 }
58
59 ChiptuneJsPlayer.prototype.getCurrentRow = function() {
60 return libopenmpt._openmpt_module_get_current_row(this.currentPlayingNode.modulePtr);
61 }
62
63 ChiptuneJsPlayer.prototype.getCurrentPattern = function() {
64 return libopenmpt._openmpt_module_get_current_pattern(this.currentPlayingNode.modulePtr);
65 }
66
67 ChiptuneJsPlayer.prototype.getCurrentOrder = function() {
68 return libopenmpt._openmpt_module_get_current_order(this.currentPlayingNode.modulePtr);
69 }
70
71 ChiptuneJsPlayer.prototype.metadata = function() {
72 var data = {};
73 var keys = Pointer_stringify(libopenmpt._openmpt_module_get_metadata_keys(this.currentPlayingNode.modulePtr)).split(';');
74 var keyNameBuffer = 0;
75 for (var i = 0; i < keys.length; i++) {
76 keyNameBuffer = libopenmpt._malloc(keys[i].length + 1);
77 writeAsciiToMemory(keys[i], keyNameBuffer);
78 data[keys[i]] = Pointer_stringify(libopenmpt._openmpt_module_get_metadata(this.currentPlayingNode.modulePtr, keyNameBuffer));
79 libopenmpt._free(keyNameBuffer);
80 }
81 return data;
82 }
83
84 ChiptuneJsPlayer.prototype.module_ctl_set = function(ctl, value) {
85 return libopenmpt.ccall('openmpt_module_ctl_set', 'number', ['number', 'string', 'string'], [this.currentPlayingNode.modulePtr, ctl, value]) === 1;
86 }
87
88 // playing, etc
89 ChiptuneJsPlayer.prototype.unlock = function() {
90
91 var context = this.context;
92 var buffer = context.createBuffer(1, 1, 22050);
93 var unlockSource = context.createBufferSource();
94
95 unlockSource.buffer = buffer;
96 unlockSource.connect(context.destination);
97 unlockSource.start(0);
98
99 this.touchLocked = false;
100 }
101
102 ChiptuneJsPlayer.prototype.load = function(input, callback) {
103
104 if (this.touchLocked) {
105 this.unlock();
106 }
107
108 var player = this;
109
110 if (input instanceof File) {
111 var reader = new FileReader();
112 reader.onload = function() {
113 return callback(reader.result); // no error
114 }.bind(this);
115 reader.readAsArrayBuffer(input);
116 } else {
117 var xhr = new XMLHttpRequest();
118 xhr.open('GET', input, true);
119 xhr.responseType = 'arraybuffer';
120 xhr.onload = function(e) {
121 if (xhr.status === 200) {
122 return callback(xhr.response); // no error
123 } else {
124 player.fireEvent('onError', {type: 'onxhr'});
125 }
126 }.bind(this);
127 xhr.onerror = function() {
128 player.fireEvent('onError', {type: 'onxhr'});
129 };
130 xhr.onabort = function() {
131 player.fireEvent('onError', {type: 'onxhr'});
132 };
133 xhr.send();
134 }
135 }
136
137 ChiptuneJsPlayer.prototype.play = function(buffer) {
138 this.stop();
139 var processNode = this.createLibopenmptNode(buffer, this.config);
140 if (processNode == null) {
141 return;
142 }
143
144 // set config options on module
145 libopenmpt._openmpt_module_set_repeat_count(processNode.modulePtr, this.config.repeatCount);
146 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT, this.config.stereoSeparation);
147 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH, this.config.interpolationFilter);
148
149 this.currentPlayingNode = processNode;
150 processNode.connect(this.context.destination);
151 }
152
153 ChiptuneJsPlayer.prototype.stop = function() {
154 if (this.currentPlayingNode != null) {
155 this.currentPlayingNode.disconnect();
156 this.currentPlayingNode.cleanup();
157 this.currentPlayingNode = null;
158 }
159 }
160
161 ChiptuneJsPlayer.prototype.togglePause = function() {
162 if (this.currentPlayingNode != null) {
163 this.currentPlayingNode.togglePause();
164 }
165 }
166
167 ChiptuneJsPlayer.prototype.createLibopenmptNode = function(buffer, config) {
168 // TODO error checking in this whole function
169
170 var maxFramesPerChunk = 4096;
171 var processNode = this.context.createScriptProcessor(2048, 0, 2);
172 processNode.config = config;
173 processNode.player = this;
174 var byteArray = new Int8Array(buffer);
175 var ptrToFile = libopenmpt._malloc(byteArray.byteLength);
176 libopenmpt.HEAPU8.set(byteArray, ptrToFile);
177 processNode.modulePtr = libopenmpt._openmpt_module_create_from_memory(ptrToFile, byteArray.byteLength, 0, 0, 0);
178 processNode.paused = false;
179 processNode.leftBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
180 processNode.rightBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
181 processNode.cleanup = function() {
182 if (this.modulePtr != 0) {
183 libopenmpt._openmpt_module_destroy(this.modulePtr);
184 this.modulePtr = 0;
185 }
186 if (this.leftBufferPtr != 0) {
187 libopenmpt._free(this.leftBufferPtr);
188 this.leftBufferPtr = 0;
189 }
190 if (this.rightBufferPtr != 0) {
191 libopenmpt._free(this.rightBufferPtr);
192 this.rightBufferPtr = 0;
193 }
194 }
195 processNode.stop = function() {
196 this.disconnect();
197 this.cleanup();
198 }
199 processNode.pause = function() {
200 this.paused = true;
201 }
202 processNode.unpause = function() {
203 this.paused = false;
204 }
205 processNode.togglePause = function() {
206 this.paused = !this.paused;
207 }
208 processNode.onaudioprocess = function(e) {
209 var outputL = e.outputBuffer.getChannelData(0);
210 var outputR = e.outputBuffer.getChannelData(1);
211 var framesToRender = outputL.length;
212 if (this.ModulePtr == 0) {
213 for (var i = 0; i < framesToRender; ++i) {
214 outputL[i] = 0;
215 outputR[i] = 0;
216 }
217 this.disconnect();
218 this.cleanup();
219 return;
220 }
221 if (this.paused) {
222 for (var i = 0; i < framesToRender; ++i) {
223 outputL[i] = 0;
224 outputR[i] = 0;
225 }
226 return;
227 }
228 var framesRendered = 0;
229 var ended = false;
230 var error = false;
231 while (framesToRender > 0) {
232 var framesPerChunk = Math.min(framesToRender, maxFramesPerChunk);
233 var actualFramesPerChunk = libopenmpt._openmpt_module_read_float_stereo(this.modulePtr, this.context.sampleRate, framesPerChunk, this.leftBufferPtr, this.rightBufferPtr);
234 if (actualFramesPerChunk == 0) {
235 ended = true;
236 // modulePtr will be 0 on openmpt: error: openmpt_module_read_float_stereo: ERROR: module * not valid or other openmpt error
237 error = !this.modulePtr;
238 }
239 var rawAudioLeft = libopenmpt.HEAPF32.subarray(this.leftBufferPtr / 4, this.leftBufferPtr / 4 + actualFramesPerChunk);
240 var rawAudioRight = libopenmpt.HEAPF32.subarray(this.rightBufferPtr / 4, this.rightBufferPtr / 4 + actualFramesPerChunk);
241 for (var i = 0; i < actualFramesPerChunk; ++i) {
242 outputL[framesRendered + i] = rawAudioLeft[i];
243 outputR[framesRendered + i] = rawAudioRight[i];
244 }
245 for (var i = actualFramesPerChunk; i < framesPerChunk; ++i) {
246 outputL[framesRendered + i] = 0;
247 outputR[framesRendered + i] = 0;
248 }
249 framesToRender -= framesPerChunk;
250 framesRendered += framesPerChunk;
251 }
252 if (ended) {
253 this.disconnect();
254 this.cleanup();
255 error ? processNode.player.fireEvent('onError', {type: 'openmpt'}) : processNode.player.fireEvent('onEnded');
256 }
257 }
258 return processNode;
259 }