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4
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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 = 1
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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.metadata = function() {
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72 var data = {};
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73 var keys = Pointer_stringify(libopenmpt._openmpt_module_get_metadata_keys(this.currentPlayingNode.modulePtr)).split(';');
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74 var keyNameBuffer = 0;
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75 for (var i = 0; i < keys.length; i++) {
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76 keyNameBuffer = libopenmpt._malloc(keys[i].length + 1);
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77 writeAsciiToMemory(keys[i], keyNameBuffer);
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78 data[keys[i]] = Pointer_stringify(libopenmpt._openmpt_module_get_metadata(this.currentPlayingNode.modulePtr, keyNameBuffer));
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79 libopenmpt._free(keyNameBuffer);
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80 }
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81 return data;
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82 }
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83
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84 ChiptuneJsPlayer.prototype.module_ctl_set = function(ctl, value) {
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85 return libopenmpt.ccall('openmpt_module_ctl_set', 'number', ['number', 'string', 'string'], [this.currentPlayingNode.modulePtr, ctl, value]) === 1;
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86 }
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87
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88 // playing, etc
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89 ChiptuneJsPlayer.prototype.unlock = function() {
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90
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91 var context = this.context;
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92 var buffer = context.createBuffer(1, 1, 22050);
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93 var unlockSource = context.createBufferSource();
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94
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95 unlockSource.buffer = buffer;
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96 unlockSource.connect(context.destination);
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97 unlockSource.start(0);
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98
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99 this.touchLocked = false;
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100 }
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101
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102 ChiptuneJsPlayer.prototype.load = function(input, callback) {
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103
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104 if (this.touchLocked) {
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105 this.unlock();
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106 }
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107
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108 var player = this;
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109
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110 if (input instanceof File) {
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111 var reader = new FileReader();
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112 reader.onload = function() {
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113 return callback(reader.result); // no error
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114 }.bind(this);
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115 reader.readAsArrayBuffer(input);
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116 } else {
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117 var xhr = new XMLHttpRequest();
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118 xhr.open('GET', input, true);
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119 xhr.responseType = 'arraybuffer';
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120 xhr.onload = function(e) {
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121 if (xhr.status === 200) {
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122 return callback(xhr.response); // no error
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123 } else {
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124 player.fireEvent('onError', {type: 'onxhr'});
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125 }
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126 }.bind(this);
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127 xhr.onerror = function() {
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128 player.fireEvent('onError', {type: 'onxhr'});
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129 };
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130 xhr.onabort = function() {
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131 player.fireEvent('onError', {type: 'onxhr'});
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132 };
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133 xhr.send();
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134 }
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135 }
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136
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137 ChiptuneJsPlayer.prototype.play = function(buffer) {
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138 this.stop();
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139 var processNode = this.createLibopenmptNode(buffer, this.config);
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140 if (processNode == null) {
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141 return;
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142 }
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143
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144 // set config options on module
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145 libopenmpt._openmpt_module_set_repeat_count(processNode.modulePtr, this.config.repeatCount);
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146 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT, this.config.stereoSeparation);
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147 libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH, this.config.interpolationFilter);
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148
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149 this.currentPlayingNode = processNode;
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150 processNode.connect(this.context.destination);
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151 }
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152
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153 ChiptuneJsPlayer.prototype.stop = function() {
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154 if (this.currentPlayingNode != null) {
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155 this.currentPlayingNode.disconnect();
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156 this.currentPlayingNode.cleanup();
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157 this.currentPlayingNode = null;
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158 }
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159 }
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160
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161 ChiptuneJsPlayer.prototype.togglePause = function() {
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162 if (this.currentPlayingNode != null) {
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163 this.currentPlayingNode.togglePause();
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164 }
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165 }
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166
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167 ChiptuneJsPlayer.prototype.createLibopenmptNode = function(buffer, config) {
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168 // TODO error checking in this whole function
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169
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170 var maxFramesPerChunk = 4096;
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171 var processNode = this.context.createScriptProcessor(2048, 0, 2);
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172 processNode.config = config;
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173 processNode.player = this;
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174 var byteArray = new Int8Array(buffer);
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175 var ptrToFile = libopenmpt._malloc(byteArray.byteLength);
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176 libopenmpt.HEAPU8.set(byteArray, ptrToFile);
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177 processNode.modulePtr = libopenmpt._openmpt_module_create_from_memory(ptrToFile, byteArray.byteLength, 0, 0, 0);
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178 processNode.paused = false;
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179 processNode.leftBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
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180 processNode.rightBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
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181 processNode.cleanup = function() {
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182 if (this.modulePtr != 0) {
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183 libopenmpt._openmpt_module_destroy(this.modulePtr);
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184 this.modulePtr = 0;
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185 }
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186 if (this.leftBufferPtr != 0) {
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187 libopenmpt._free(this.leftBufferPtr);
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188 this.leftBufferPtr = 0;
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189 }
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190 if (this.rightBufferPtr != 0) {
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191 libopenmpt._free(this.rightBufferPtr);
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192 this.rightBufferPtr = 0;
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193 }
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194 }
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195 processNode.stop = function() {
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196 this.disconnect();
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197 this.cleanup();
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198 }
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199 processNode.pause = function() {
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200 this.paused = true;
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201 }
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202 processNode.unpause = function() {
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203 this.paused = false;
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204 }
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205 processNode.togglePause = function() {
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206 this.paused = !this.paused;
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207 }
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208 processNode.onaudioprocess = function(e) {
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209 var outputL = e.outputBuffer.getChannelData(0);
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210 var outputR = e.outputBuffer.getChannelData(1);
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211 var framesToRender = outputL.length;
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212 if (this.ModulePtr == 0) {
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213 for (var i = 0; i < framesToRender; ++i) {
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214 outputL[i] = 0;
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215 outputR[i] = 0;
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216 }
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217 this.disconnect();
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218 this.cleanup();
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219 return;
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220 }
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221 if (this.paused) {
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222 for (var i = 0; i < framesToRender; ++i) {
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223 outputL[i] = 0;
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224 outputR[i] = 0;
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225 }
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226 return;
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227 }
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228 var framesRendered = 0;
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229 var ended = false;
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230 var error = false;
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231 while (framesToRender > 0) {
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232 var framesPerChunk = Math.min(framesToRender, maxFramesPerChunk);
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233 var actualFramesPerChunk = libopenmpt._openmpt_module_read_float_stereo(this.modulePtr, this.context.sampleRate, framesPerChunk, this.leftBufferPtr, this.rightBufferPtr);
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234 if (actualFramesPerChunk == 0) {
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235 ended = true;
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236 // modulePtr will be 0 on openmpt: error: openmpt_module_read_float_stereo: ERROR: module * not valid or other openmpt error
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237 error = !this.modulePtr;
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238 }
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239 var rawAudioLeft = libopenmpt.HEAPF32.subarray(this.leftBufferPtr / 4, this.leftBufferPtr / 4 + actualFramesPerChunk);
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240 var rawAudioRight = libopenmpt.HEAPF32.subarray(this.rightBufferPtr / 4, this.rightBufferPtr / 4 + actualFramesPerChunk);
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241 for (var i = 0; i < actualFramesPerChunk; ++i) {
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242 outputL[framesRendered + i] = rawAudioLeft[i];
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243 outputR[framesRendered + i] = rawAudioRight[i];
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244 }
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245 for (var i = actualFramesPerChunk; i < framesPerChunk; ++i) {
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246 outputL[framesRendered + i] = 0;
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247 outputR[framesRendered + i] = 0;
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248 }
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249 framesToRender -= framesPerChunk;
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250 framesRendered += framesPerChunk;
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251 }
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252 if (ended) {
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253 this.disconnect();
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254 this.cleanup();
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255 error ? processNode.player.fireEvent('onError', {type: 'openmpt'}) : processNode.player.fireEvent('onEnded');
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256 }
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257 }
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258 return processNode;
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259 }
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