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annotate js/chiptune2.js @ 66:ba20211d6b00

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author Paper <mrpapersonic@gmail.com>
date Tue, 28 Mar 2023 16:46:44 -0400
parents e6c574c6f8e0
children 629553bdc8aa
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58
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1 // constants
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2 const OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT = 2
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3 const OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH = 3
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4
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5 // audio context
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6 var ChiptuneAudioContext = window['AudioContext'] || window['webkitAudioContext'];
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7
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8 // config
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9 var ChiptuneJsConfig = function (repeatCount, stereoSeparation, interpolationFilter, context)
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10 {
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11 this.repeatCount = repeatCount;
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12 this.stereoSeparation = stereoSeparation;
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13 this.interpolationFilter = interpolationFilter;
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14 this.context = context;
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15 }
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16
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17 ChiptuneJsConfig.prototype.constructor = ChiptuneJsConfig;
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18
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19 // player
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20 var ChiptuneJsPlayer = function (config) {
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21 this.config = config;
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22 this.context = config.context || new ChiptuneAudioContext();
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23 this.currentPlayingNode = null;
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24 this.handlers = [];
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25 this.touchLocked = true;
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26 }
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27
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28 ChiptuneJsPlayer.prototype.constructor = ChiptuneJsPlayer;
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29
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30 // event handlers section
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31 ChiptuneJsPlayer.prototype.fireEvent = function (eventName, response) {
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32 var handlers = this.handlers;
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33 if (handlers.length) {
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34 handlers.forEach(function (handler) {
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35 if (handler.eventName === eventName) {
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36 handler.handler(response);
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37 }
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38 })
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39 }
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40 }
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41
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42 ChiptuneJsPlayer.prototype.addHandler = function (eventName, handler) {
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43 this.handlers.push({eventName: eventName, handler: handler});
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44 }
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45
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46 ChiptuneJsPlayer.prototype.onEnded = function (handler) {
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47 this.addHandler('onEnded', handler);
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48 }
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49
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50 ChiptuneJsPlayer.prototype.onError = function (handler) {
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51 this.addHandler('onError', handler);
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52 }
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53
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54 // metadata
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55 ChiptuneJsPlayer.prototype.duration = function() {
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56 return libopenmpt._openmpt_module_get_duration_seconds(this.currentPlayingNode.modulePtr);
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57 }
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58
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59 ChiptuneJsPlayer.prototype.getCurrentRow = function() {
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60 return libopenmpt._openmpt_module_get_current_row(this.currentPlayingNode.modulePtr);
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61 }
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62
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63 ChiptuneJsPlayer.prototype.getCurrentPattern = function() {
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64 return libopenmpt._openmpt_module_get_current_pattern(this.currentPlayingNode.modulePtr);
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65 }
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66
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67 ChiptuneJsPlayer.prototype.getCurrentOrder = function() {
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68 return libopenmpt._openmpt_module_get_current_order(this.currentPlayingNode.modulePtr);
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69 }
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70
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71 ChiptuneJsPlayer.prototype.getCurrentTime = function () {
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72 return libopenmpt._openmpt_module_get_position_seconds(this.currentPlayingNode.modulePtr);
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73 };
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74
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75 ChiptuneJsPlayer.prototype.getTotalOrder = function () {
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76 return libopenmpt._openmpt_module_get_num_orders(this.currentPlayingNode.modulePtr);
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77 };
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78
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79 ChiptuneJsPlayer.prototype.getTotalPatterns = function () {
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80 return libopenmpt._openmpt_module_get_num_patterns(this.currentPlayingNode.modulePtr);
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81 };
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82
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83 ChiptuneJsPlayer.prototype.metadata = function() {
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84 var data = {};
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85 var keys = UTF8ToString(libopenmpt._openmpt_module_get_metadata_keys(this.currentPlayingNode.modulePtr)).split(';');
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86 var keyNameBuffer = 0;
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87 for (var i = 0; i < keys.length; i++) {
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88 keyNameBuffer = libopenmpt._malloc(keys[i].length + 1);
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89 writeAsciiToMemory(keys[i], keyNameBuffer);
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90 data[keys[i]] = UTF8ToString(libopenmpt._openmpt_module_get_metadata(this.currentPlayingNode.modulePtr, keyNameBuffer));
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91 libopenmpt._free(keyNameBuffer);
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92 }
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93 return data;
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94 }
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95
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96 ChiptuneJsPlayer.prototype.module_ctl_set = function(ctl, value) {
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97 return libopenmpt.ccall('openmpt_module_ctl_set', 'number', ['number', 'string', 'string'], [this.currentPlayingNode.modulePtr, ctl, value]) === 1;
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98 }
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99
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100 // playing, etc
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101 ChiptuneJsPlayer.prototype.unlock = function() {
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102
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103 var context = this.context;
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104 var buffer = context.createBuffer(1, 1, 22050);
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105 var unlockSource = context.createBufferSource();
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106
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107 unlockSource.buffer = buffer;
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108 unlockSource.connect(context.destination);
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109 unlockSource.start(0);
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110
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111 this.touchLocked = false;
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112 }
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113
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114 ChiptuneJsPlayer.prototype.load = function(input, callback) {
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115
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116 if (this.touchLocked) {
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117 this.unlock();
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118 }
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119
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120 var player = this;
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121
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122 if (input instanceof File) {
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123 var reader = new FileReader();
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124 reader.onload = function() {
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125 return callback(reader.result); // no error
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126 }.bind(this);
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127 reader.readAsArrayBuffer(input);
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128 } else {
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129 var xhr = new XMLHttpRequest();
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130 xhr.open('GET', input, true);
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131 xhr.responseType = 'arraybuffer';
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132 xhr.onload = function(e) {
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133 if (xhr.status === 200) {
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134 return callback(xhr.response); // no error
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135 } else {
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136 player.fireEvent('onError', {type: 'onxhr'});
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137 }
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138 }.bind(this);
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139 xhr.onerror = function() {
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140 player.fireEvent('onError', {type: 'onxhr'});
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141 };
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142 xhr.onabort = function() {
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143 player.fireEvent('onError', {type: 'onxhr'});
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144 };
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145 xhr.send();
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146 }
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147 }
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148
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149 ChiptuneJsPlayer.prototype.play = function(buffer) {
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150 this.stop();
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151 var processNode = this.createLibopenmptNode(buffer, this.config);
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152 if (processNode == null) {
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153 return;
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154 }
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155
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156 // set config options on module
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157 libopenmpt._openmpt_module_set_repeat_count(processNode.modulePtr, this.config.repeatCount);
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158 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT, this.config.stereoSeparation);
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159 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH, this.config.interpolationFilter);
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160
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161 this.currentPlayingNode = processNode;
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162 processNode.connect(this.context.destination);
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163 }
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164
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165 ChiptuneJsPlayer.prototype.stop = function() {
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166 if (this.currentPlayingNode != null) {
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167 this.currentPlayingNode.disconnect();
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168 this.currentPlayingNode.cleanup();
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169 this.currentPlayingNode = null;
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170 }
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171 }
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172
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173 ChiptuneJsPlayer.prototype.togglePause = function() {
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174 if (this.currentPlayingNode != null) {
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175 this.currentPlayingNode.togglePause();
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176 }
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177 }
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178
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179 ChiptuneJsPlayer.prototype.createLibopenmptNode = function(buffer, config) {
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180 // TODO error checking in this whole function
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181
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182 var maxFramesPerChunk = 4096;
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183 var processNode = this.context.createScriptProcessor(2048, 0, 2);
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184 processNode.config = config;
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185 processNode.player = this;
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186 var byteArray = new Int8Array(buffer);
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187 var ptrToFile = libopenmpt._malloc(byteArray.byteLength);
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188 libopenmpt.HEAPU8.set(byteArray, ptrToFile);
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189 processNode.modulePtr = libopenmpt._openmpt_module_create_from_memory(ptrToFile, byteArray.byteLength, 0, 0, 0);
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190 processNode.paused = false;
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191 processNode.leftBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
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192 processNode.rightBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
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193 processNode.cleanup = function() {
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194 if (this.modulePtr != 0) {
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195 libopenmpt._openmpt_module_destroy(this.modulePtr);
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196 this.modulePtr = 0;
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197 }
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198 if (this.leftBufferPtr != 0) {
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199 libopenmpt._free(this.leftBufferPtr);
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200 this.leftBufferPtr = 0;
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201 }
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202 if (this.rightBufferPtr != 0) {
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203 libopenmpt._free(this.rightBufferPtr);
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204 this.rightBufferPtr = 0;
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205 }
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206 }
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207 processNode.stop = function() {
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208 this.disconnect();
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209 this.cleanup();
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210 }
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211 processNode.pause = function() {
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212 this.paused = true;
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213 }
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214 processNode.unpause = function() {
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215 this.paused = false;
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216 }
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217 processNode.togglePause = function() {
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218 this.paused = !this.paused;
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219 }
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220 processNode.onaudioprocess = function(e) {
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221 var outputL = e.outputBuffer.getChannelData(0);
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222 var outputR = e.outputBuffer.getChannelData(1);
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223 var framesToRender = outputL.length;
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224 if (this.ModulePtr == 0) {
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225 for (var i = 0; i < framesToRender; ++i) {
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226 outputL[i] = 0;
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227 outputR[i] = 0;
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228 }
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229 this.disconnect();
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230 this.cleanup();
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231 return;
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232 }
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233 if (this.paused) {
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234 for (var i = 0; i < framesToRender; ++i) {
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235 outputL[i] = 0;
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236 outputR[i] = 0;
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237 }
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238 return;
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239 }
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240 var framesRendered = 0;
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241 var ended = false;
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242 var error = false;
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243 while (framesToRender > 0) {
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244 var framesPerChunk = Math.min(framesToRender, maxFramesPerChunk);
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245 var actualFramesPerChunk = libopenmpt._openmpt_module_read_float_stereo(this.modulePtr, this.context.sampleRate, framesPerChunk, this.leftBufferPtr, this.rightBufferPtr);
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246 if (actualFramesPerChunk == 0) {
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247 ended = true;
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248 // modulePtr will be 0 on openmpt: error: openmpt_module_read_float_stereo: ERROR: module * not valid or other openmpt error
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249 error = !this.modulePtr;
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250 }
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251 var rawAudioLeft = libopenmpt.HEAPF32.subarray(this.leftBufferPtr / 4, this.leftBufferPtr / 4 + actualFramesPerChunk);
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252 var rawAudioRight = libopenmpt.HEAPF32.subarray(this.rightBufferPtr / 4, this.rightBufferPtr / 4 + actualFramesPerChunk);
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253 for (var i = 0; i < actualFramesPerChunk; ++i) {
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254 outputL[framesRendered + i] = rawAudioLeft[i];
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255 outputR[framesRendered + i] = rawAudioRight[i];
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256 }
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257 for (var i = actualFramesPerChunk; i < framesPerChunk; ++i) {
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258 outputL[framesRendered + i] = 0;
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259 outputR[framesRendered + i] = 0;
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260 }
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261 framesToRender -= framesPerChunk;
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262 framesRendered += framesPerChunk;
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263 }
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264 if (ended) {
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265 this.disconnect();
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266 this.cleanup();
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267 error ? processNode.player.fireEvent('onError', {type: 'openmpt'}) : processNode.player.fireEvent('onEnded');
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268 }
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269 }
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270 return processNode;
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271 }