Forked from:: TheCoolMuseum's forked from: 画像のWAVファイル化

画像のWAVファイル化誤差拡散2値化付

画像をオシロスコープ用の音声信号に変換します。
解像度大きめの画像用に飛ばして走査
使用例 http://www.youtube.com/watch?v=1h8QF0g4kPw

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license : MIT License
modified : 2009-12-11 22:19:49

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// forked from TheCoolMuseum's forked from: 画像のWAVファイル化
// forked from TheCoolMuseum's 画像のWAVファイル化
// forked from TheCoolMuseum's ローカルファイルの読み込み・保存
// 画像をオシロスコープ用の音声信号に変換します。
// 解像度大きめの画像用に飛ばして走査
// 使用例 http://www.youtube.com/watch?v=1h8QF0g4kPw

package {
	import flash.utils.IDataInput;
	import flash.display.InterpolationMethod;
    import flash.display.Sprite;
    import flash.display.Loader;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.utils.ByteArray;
    import flash.utils.Endian;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.net.FileReference;
    import flash.net.FileFilter;
    
    public class FlashTest extends Sprite {
        private var fileLoader:FileReference;
        private var fileSaver:FileReference;
        private var imageLoader:Loader;
        private var wavBuffer:ByteArray;
        private var preview:Bitmap;
        
        private var uIx:Array = [0,2,1,3,0,2,1,3,0,2,1,3,0,2,1,3];
        private var vIx:Array = [0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3];
        
        public function makeBtn(name:String):TextField{
           var btn:TextField = new TextField();
            btn.text = name;
            btn.autoSize = TextFieldAutoSize.LEFT;
            btn.border = true;
            btn.selectable = false;
            return btn;
        } 
        public function FlashTest() {
	        	preview = new Bitmap();
	        	preview.y = 60;
	        	addChild(preview);
            var loadBtn:TextField = makeBtn("LOAD");
            addChild(loadBtn);
            loadBtn.addEventListener(MouseEvent.CLICK, onClickLoadBtn);
            
            var saveBtn:TextField = makeBtn("SAVE");
            saveBtn.y = 32;
            addChild(saveBtn);
            saveBtn.addEventListener(MouseEvent.CLICK, onClickSaveBtn);
        }
        private function onClickLoadBtn(e:Event):void{
            load();
        }
        private function load():void{
            var fileFilter:FileFilter = new FileFilter("Images (.png .jpg .gif)", "*.png;*.jpg;*.gif");

fileLoader = new FileReference();
        	fileLoader.addEventListener(Event.SELECT, onSelectLoadFile);
        	fileLoader.addEventListener(Event.COMPLETE, onCompleteLoadFile);
        	
        	fileLoader.browse([fileFilter]);
        }
        private function onSelectLoadFile(e:Event):void{
            fileLoader.load();
        }
        private function onCompleteLoadFile(e:Event):void{
            imageLoader = new Loader();
            imageLoader.loadBytes(fileLoader.data);
            imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteLoadImage);
        }
        private function onCompleteLoadImage(e:Event):void{
            var width:int = imageLoader.width;
            var height:int = imageLoader.height;
            var bitmapData:BitmapData = new BitmapData(width, height);
            bitmapData.draw(imageLoader);
            
            errorDiffusion(bitmapData);
            preview.bitmapData = bitmapData;
            
            var vNum:int =Math.floor(height/4);
            var uNum:int =Math.floor(width/4);
            
            var dataBuffer:ByteArray = new ByteArray();
            dataBuffer.endian = Endian.LITTLE_ENDIAN;
            for(var i:int=0; i<16; i++){
                for(var v:int=0; v<vNum; v++){
                    for(var u:int=0; u<uNum; u++){
                        var pV:int = v*4 + vIx[i];
                        var pU:int = u*4 + uIx[i];
                        if(pU<=width && pV<=height){
                            var color:uint = bitmapData.getPixel(pU, pV);
                            var c:Number = (color&0xff) + ((color>>8)&0xff) + ((color>>16)&0xff);
                            if(c>384){
                                var l:int = 32768-int(pV/height*65535);
                                var r:int = int(pU/width*65535)-32768;
                                dataBuffer.writeShort(l); 
                                dataBuffer.writeShort(r); 
                            }
                        }
                    }
                }
            }
            var fmtBuffer:ByteArray = new ByteArray();
            fmtBuffer.endian = Endian.LITTLE_ENDIAN
            fmtBuffer.writeShort(1); //PCM
            fmtBuffer.writeShort(2); //Stereo
            fmtBuffer.writeUnsignedInt(44100); //SampleRate
            fmtBuffer.writeUnsignedInt(44100*4); //DataRate
            fmtBuffer.writeShort(4); //4Byte = 16bit*Stereo
            fmtBuffer.writeShort(16); //16bit

var loopBuffer:ByteArray = new ByteArray();
            loopBuffer.endian = Endian.LITTLE_ENDIAN
            loopBuffer.writeUnsignedInt(0); //Manufacturer
            loopBuffer.writeUnsignedInt(0); //Product
            loopBuffer.writeUnsignedInt(0); //Sample Period
            loopBuffer.writeUnsignedInt(0x3C); //MIDI Unity Note
            loopBuffer.writeUnsignedInt(0); //MIDI Pitch Fraction
            loopBuffer.writeUnsignedInt(0); //SMPTE Format
            loopBuffer.writeUnsignedInt(0); //SMPTE Offset
            loopBuffer.writeUnsignedInt(1); //Num Sample Loops
            loopBuffer.writeUnsignedInt(0); //Sampler Data
            loopBuffer.writeUnsignedInt(0); //Cue Point ID
            loopBuffer.writeUnsignedInt(0); //Type
            loopBuffer.writeUnsignedInt(0); //Start
            loopBuffer.writeUnsignedInt(dataBuffer.length/4); //End
            loopBuffer.writeUnsignedInt(0); //Fraction
            loopBuffer.writeUnsignedInt(0); //Play Count

wavBuffer = new ByteArray();
            wavBuffer.endian = Endian.LITTLE_ENDIAN

wavBuffer.writeUTFBytes("RIFF")	;
            wavBuffer.writeUnsignedInt(36 + fmtBuffer.length + dataBuffer.length + loopBuffer.length);
            
            wavBuffer.writeUTFBytes("WAVE")	;
            
            wavBuffer.writeUTFBytes("fmt ")	;
            wavBuffer.writeUnsignedInt(fmtBuffer.length);
            wavBuffer.writeBytes(fmtBuffer);
            
            wavBuffer.writeUTFBytes("data")	;
            wavBuffer.writeUnsignedInt(dataBuffer.length);
            wavBuffer.writeBytes(dataBuffer);
            
            wavBuffer.writeUTFBytes("smpl")	;
            wavBuffer.writeUnsignedInt(loopBuffer.length);
            wavBuffer.writeBytes(loopBuffer);
        }
        private function onClickSaveBtn(e:Event):void{
            save();
        }
        private function save():void{
           	fileSaver = new FileReference();
           	fileSaver.save(wavBuffer,fileLoader.name.split(".")[0]+".wav");
        }
        
        private function errorDiffusion(img:BitmapData):BitmapData{
        		var width:int = img.width;
        		var height:int = img.height;
        		var array:ByteArray = img.getPixels(img.rect);
        		var l:int=array.length;
        		for(var y:int=0; y<height; y++){
        			var pos:int = y*width*4;
        			for(var x:int=0; x<width; x++){
        				var c:int = array[pos+1]+array[pos+2]+array[pos+3];
        				c /= 3;
                     var dst:Number = c>127 ? 255 : 0;
                     var err:Number = c>127 ? c-255 : c;
                     var c1:int = err*5/16;
                     var c2:int = err*3/16;

array[pos] = 0xff;
                     array[pos+1] = dst;
                     array[pos+2] = dst;
                     array[pos+3] = dst;
                     if(y<height-1){
                           array[pos+width*4+1] = clip8bit((array[pos+width*4+1]+array[pos+width*4+2]+array[pos+width*4+3])/3 + c1);
                           array[pos+width*4+2] = array[pos+width*4+1];
                           array[pos+width*4+3] = array[pos+width*4+1];
                        if(x<width-1){
                            array[pos+5] = clip8bit((array[pos+5] +array[pos+6] +array[pos+7])/3 + c1);
                            array[pos+6] = array[pos+5];
                            array[pos+7] = array[pos+5];
                            array[pos+width*4+5] = clip8bit((array[pos+width*4+5] + array[pos+width*4+6] + array[pos+width*4+7])/3 + c2);
                            array[pos+width*4+6] = array[pos+width*4+5];
                            array[pos+width*4+7] = array[pos+width*4+5];
                        }
                        if(x>0){
                            array[pos+width*4-3] = clip8bit((array[pos+width*4-3] + array[pos+width*4-2] + array[pos+width*4-1])/3 + c2);
                            array[pos+width*4-2] = array[pos+width*4-3];
                            array[pos+width*4-1] = array[pos+width*4-3];
                        }
                     }else{
                        if(x<width-1){
                            array[pos+5] = clip8bit((array[pos+5] + array[pos+6] + array[pos+7])/3 + c1);
                            array[pos+6] = array[pos+5];
                            array[pos+7] = array[pos+5];
                        }
                     }
                     pos+=4;
        			}
        		}
        		array.position=0;
            img.setPixels(img.rect, array);
        
        		return img;
        }
        private function clip8bit(n:int):int{
        		return Math.min(255,Math.max(0,n));
        }
    }
}

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