41 lines
6.9 KiB
JavaScript
41 lines
6.9 KiB
JavaScript
const OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT=0
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const OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH=1
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var ChiptuneAudioContext=window['AudioContext']||window['webkitAudioContext'];var ChiptuneJsConfig=function(repeatCount,stereoSeparation,interpolationFilter,context)
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{this.repeatCount=repeatCount;this.stereoSeparation=stereoSeparation;this.interpolationFilter=interpolationFilter;this.context=context;}
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ChiptuneJsConfig.prototype.constructor=ChiptuneJsConfig;var ChiptuneJsPlayer=function(config){this.config=config;this.context=config.context||new ChiptuneAudioContext();this.currentPlayingNode=null;this.gainNode=null;this.analyzerNode=null;this.handlers=[];this.touchLocked=true;}
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ChiptuneJsPlayer.prototype.constructor=ChiptuneJsPlayer;ChiptuneJsPlayer.prototype.fireEvent=function(eventName,response){var handlers=this.handlers;if(handlers.length){handlers.forEach(function(handler){if(handler.eventName===eventName){handler.handler(response);}})}}
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ChiptuneJsPlayer.prototype.addHandler=function(eventName,handler){this.handlers.push({eventName:eventName,handler:handler});}
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ChiptuneJsPlayer.prototype.onEnded=function(handler){this.addHandler('onEnded',handler);}
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ChiptuneJsPlayer.prototype.onError=function(handler){this.addHandler('onError',handler);}
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ChiptuneJsPlayer.prototype.duration=function(){return Module._openmpt_module_get_duration_seconds(this.currentPlayingNode.modulePtr);}
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ChiptuneJsPlayer.prototype.getCurrentRow=function(){return Module._openmpt_module_get_current_row(this.currentPlayingNode.modulePtr);}
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ChiptuneJsPlayer.prototype.getCurrentPattern=function(){return Module._openmpt_module_get_current_pattern(this.currentPlayingNode.modulePtr);}
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ChiptuneJsPlayer.prototype.getCurrentOrder=function(){return Module._openmpt_module_get_current_order(this.currentPlayingNode.modulePtr);}
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ChiptuneJsPlayer.prototype.metadata=function(){var data={};var keys=Pointer_stringify(Module._openmpt_module_get_metadata_keys(this.currentPlayingNode.modulePtr)).split(';');var keyNameBuffer=0;for(var i=0;i<keys.length;i++){keyNameBuffer=Module._malloc(keys[i].length+1);writeAsciiToMemory(keys[i],keyNameBuffer);data[keys[i]]=Pointer_stringify(Module._openmpt_module_get_metadata(this.currentPlayingNode.modulePtr,keyNameBuffer));Module._free(keyNameBuffer);}
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return data;}
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ChiptuneJsPlayer.prototype.module_ctl_set=function(ctl,value){return Module.ccall('openmpt_module_ctl_set','number',['number','string','string'],[this.currentPlayingNode.modulePtr,ctl,value])===1;}
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ChiptuneJsPlayer.prototype.unlock=function(){var context=this.context;var buffer=context.createBuffer(1,1,22050);var unlockSource=context.createBufferSource();unlockSource.buffer=buffer;unlockSource.connect(context.destination);unlockSource.start(0);this.touchLocked=false;}
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ChiptuneJsPlayer.prototype.load=function(input,callback){if(this.touchLocked){this.unlock();}
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var player=this;if(input instanceof File){var reader=new FileReader();reader.onload=function(){return callback(reader.result);}.bind(this);reader.readAsArrayBuffer(input);}else{var xhr=new XMLHttpRequest();xhr.open('GET',input,true);xhr.responseType='arraybuffer';xhr.onload=function(e){if(xhr.status===200){return callback(xhr.response);}else{player.fireEvent('onError',{type:'onxhr'});}}.bind(this);xhr.onerror=function(){player.fireEvent('onError',{type:'onxhr'});};xhr.onabort=function(){player.fireEvent('onError',{type:'onxhr'});};xhr.send();}}
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ChiptuneJsPlayer.prototype.play=function(buffer){this.stop();var processNode=this.createLibopenmptNode(buffer,this.config);if(processNode==null){return;}
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Module._openmpt_module_set_repeat_count(processNode.modulePtr,this.config.repeatCount);Module._openmpt_module_set_render_param(processNode.modulePtr,OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT,this.config.stereoSeparation);Module._openmpt_module_set_render_param(processNode.modulePtr,OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH,this.config.interpolationFilter);this.currentPlayingNode=processNode;processNode.connect(this.gainNode);this.gainNode.connect(this.analyzerNode);this.analyzerNode.connect(this.context.destination);}
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ChiptuneJsPlayer.prototype.stop=function(){if(this.currentPlayingNode!=null){this.currentPlayingNode.disconnect();this.currentPlayingNode.cleanup();this.currentPlayingNode=null;this.gainNode=null;this.analyzerNode=null;}}
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ChiptuneJsPlayer.prototype.togglePause=function(){if(this.currentPlayingNode!=null){this.currentPlayingNode.togglePause();}}
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ChiptuneJsPlayer.prototype.createLibopenmptNode=function(buffer,config){var maxFramesPerChunk=4096;var processNode=this.context.createScriptProcessor(2048,0,2);this.analyzerNode=this.context.createAnalyser();this.gainNode=this.context.createGain();processNode.config=config;processNode.player=this;var byteArray=new Int8Array(buffer);var ptrToFile=Module._malloc(byteArray.byteLength);Module.HEAPU8.set(byteArray,ptrToFile);processNode.modulePtr=Module._openmpt_module_create_from_memory(ptrToFile,byteArray.byteLength,0,0,0);processNode.paused=false;processNode.leftBufferPtr=Module._malloc(4*maxFramesPerChunk);processNode.rightBufferPtr=Module._malloc(4*maxFramesPerChunk);processNode.cleanup=function(){if(this.modulePtr!=0){Module._openmpt_module_destroy(this.modulePtr);this.modulePtr=0;}
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if(this.leftBufferPtr!=0){Module._free(this.leftBufferPtr);this.leftBufferPtr=0;}
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if(this.rightBufferPtr!=0){Module._free(this.rightBufferPtr);this.rightBufferPtr=0;}}
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processNode.stop=function(){this.disconnect();this.cleanup();}
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processNode.pause=function(){this.paused=true;}
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processNode.unpause=function(){this.paused=false;}
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processNode.togglePause=function(){this.paused=!this.paused;}
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processNode.onaudioprocess=function(e){var outputL=e.outputBuffer.getChannelData(0);var outputR=e.outputBuffer.getChannelData(1);var framesToRender=outputL.length;if(this.ModulePtr==0){for(var i=0;i<framesToRender;++i){outputL[i]=0;outputR[i]=0;}
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this.disconnect();this.cleanup();return;}
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if(this.paused){for(var i=0;i<framesToRender;++i){outputL[i]=0;outputR[i]=0;}
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return;}
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var framesRendered=0;var ended=false;var error=false;while(framesToRender>0){var framesPerChunk=Math.min(framesToRender,maxFramesPerChunk);var actualFramesPerChunk=Module._openmpt_module_read_float_stereo(this.modulePtr,this.context.sampleRate,framesPerChunk,this.leftBufferPtr,this.rightBufferPtr);if(actualFramesPerChunk==0){ended=true;error=!this.modulePtr;}
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var rawAudioLeft=Module.HEAPF32.subarray(this.leftBufferPtr/4,this.leftBufferPtr/4+actualFramesPerChunk);var rawAudioRight=Module.HEAPF32.subarray(this.rightBufferPtr/4,this.rightBufferPtr/4+actualFramesPerChunk);for(var i=0;i<actualFramesPerChunk;++i){outputL[framesRendered+i]=rawAudioLeft[i];outputR[framesRendered+i]=rawAudioRight[i];}
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for(var i=actualFramesPerChunk;i<framesPerChunk;++i){outputL[framesRendered+i]=0;outputR[framesRendered+i]=0;}
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framesToRender-=framesPerChunk;framesRendered+=framesPerChunk;}
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if(ended){this.disconnect();this.cleanup();error?processNode.player.fireEvent('onError',{type:'openmpt'}):processNode.player.fireEvent('onEnded');}}
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return processNode;}
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