MediaDrop/media_drop.html at master · kosso/MediaDrop · GitHub

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<!DOCTYPE HTML>
<html>
<head>
<title>MediaDrop -  @kosso</title>

<!--
	MediaDrop.

	No dependencies.

	Provides a simple interface to drag and drop a single image, audio or video file onto the browser
	and read the information from it and providing the data for uploading somewhere.
	- Image files do nothing but ready the file for whatever you need.
	- Audio files will automatically create an audio waveform PNG file.
	- Video files allow the user to to choose a frame and create a thumbnail image.

	Pretty damn cool, if you ask me!
	... which you didn't.
	But hey.. At least you're reading this!  :)

	: @kosso : December 2016
	: License : Attribution 3.0 Unported (CC BY 3.0) : https://creativecommons.org/licenses/by/3.0/

-->

<script>

	/* Options */
	var wave_col = '#333'; // Audio waveform colour
	var wave_width = 1000; // Audio waveform width
	var wave_height = 500; // Audio waveform height


	var el_drop, el_media, el_status, el_fname, el_ftype, el_fsize, el_fduration, el_time, el_time_val, el_media_width, el_media_height, el_thumb, el_wave, f_type, f_name, f_width, f_height, f_size, f_duration, f_duration_fmt, file_blob, audioCtx, logs, btn_clear_logs,  busy, busy_cont, time_now = 0;

    function init(){

        if (!(window.File || window.FileReader || window.Blob)) {
        	alert('The required File APIs are not fully supported in this browser.');
        	return;
        }
        if (!(window.AudioContext || window.webkitAudioContext)) {
            alert('The required AudioContext APIs are not fully supported in this browser.');
            return;
        }

        logs = document.getElementById('logs');
        btn_clear_logs = document.getElementById('clear');
    	el_status = document.getElementById('status');
    	el_drop = document.getElementById('droptarget');
    	el_fname = document.getElementById('f_name');
    	el_ftype = document.getElementById('f_type');
    	el_fsize = document.getElementById('f_size');
    	el_fduration = document.getElementById('f_duration');
    	el_wave = document.getElementById('wave');
    	// stop file drops on the rest of the page
    	window.addEventListener('dragover',function(e){
		  e.preventDefault();
		},false);
		window.addEventListener('drop',function(e){
		  e.preventDefault();
		},false);

        console.log('ready');


		btn_clear_logs.addEventListener('click',function(e){
		  logs.innerHTML = '<h6 style="margin:0">OUTPUT LOGS:</h6>';
		});


    }

    function createBusySpinner(){

		busy_cont = document.createElement('div');
		busy_cont.id = 'busy_cont';
		busy = document.createElement('div');
		busy.id = 'busy';
		busy.className = 'spinner';
		var dot = document.createElement('div');
		dot.id = 'dot';
		busy.appendChild(dot);
		busy_cont.appendChild(busy);
		return busy_cont;
    }

	function allowDrop(ev) {
		// console.log('dragover: ', ev.dataTransfer.items.length);
		if(ev.dataTransfer.items.length === 1){
			el_drop.style.borderColor = 'green';
			ev.dataTransfer.dropEffect = 'copy';
		}
	    ev.preventDefault();
	}

	function drag(ev) {
		// console.log('drag: ', ev);
	    // ev.dataTransfer.setData("text", ev.target.id);
	}

	function dragout(){
		el_drop.style.borderColor = '#ddd';
	}

	function stat(t){
		el_status.innerHTML = t;
	}

	function msg(t){
		var el_msg = document.createElement('p');
		el_msg.innerHTML = t;
		el_drop.appendChild(el_msg);
	}

	function drop(ev) {
		ev.preventDefault();
		el_drop.style.borderColor = '#ddd';
	    var dt = ev.dataTransfer;
		var files = dt.files;
		if(files.length === 0){
			return; /* this can be triggered when accidentally grabbing an already loaded image in the drop target */
		}
		if(files.length > 1){
			removeAllChildren(el_drop);
			msg('one file only please');
			return;
		}
		file_blob = null;
		el_thumb = null;

		time_now = 0;
		removeAllChildren(el_drop);

		el_fduration.innerHTML = el_fsize.innerHTML = el_fname.innerHTML = el_ftype.innerHTML = '';

	    busy_cont = createBusySpinner()
	      	el_drop.appendChild(busy_cont);

	    msg('loading file');
	    stat('file dropped');

	    var _blob;

		for (var i=0; i<files.length; i++) {
			var file = files[i];
	    	// console.log('loading file: ', file);
	    	// file.size
	    	// file.type
	    	// file.name
	    	f_name = file.name;
	    	f_type = file.type;
	    	f_size = file.size;

	    	el_fname.innerHTML = f_name;
			el_fsize.innerHTML = f_size + ' bytes';
			el_ftype.innerHTML = f_type;

			console.log('file: ', file);

			file_blob = URL.createObjectURL(file);
			// console.log('file_blob: ', file_blob);

			removeAllChildren(el_drop);

			if(f_type === 'image/jpeg' || f_type === 'image/gif' || f_type === 'image/png'){

            	busy_cont = createBusySpinner();
            	el_drop.appendChild(busy_cont);

            	el_media = document.createElement('img');
            	el_media.id = 'media';
            	el_media.src = file_blob;
            	el_fduration.innerHTML = '-';
            	el_drop.appendChild(el_media);
            	el_media.addEventListener('load', function(e){
					// console.log('image loaded: ', e);
					el_fduration.innerHTML = el_media.naturalWidth + ' x ' + el_media.naturalHeight;
					stat('image loaded');
					el_drop.removeChild(busy_cont);


				    objectUrlToBlob(file_blob, function(blob){
                    	file_blob_data = blob;
	                    console.log(file_blob_data);

					    // Image file ready  (file_blob / file_blob_data)

                    });
				});

            } else if(f_type === 'video/mp4'){
            	stat('loading video');
            	busy_cont = createBusySpinner();
            	el_drop.appendChild(busy_cont);
                el_media = document.createElement('video');
                el_media.setAttribute('controls', true);
				var source = document.createElement('source');
				source.type = f_type;
				source.src = file_blob;
				el_media.appendChild(source);
				el_media.addEventListener('durationchange', function(e){
					// console.log('video durationchange: ', e);
					f_duration = e.target.duration; // in float seconds
					f_duration_fmt = SecondsTohhmmss(Math.floor(f_duration - 0.5));
					el_fduration.innerHTML = f_duration + ' seconds ['+f_duration_fmt+']';
				});

	        	el_media.addEventListener('load', function(e){
					//console.log('load: ', e);
				});

	        	el_media.addEventListener('timeupdate', function(e){
	        		// console.log(e);
	        		time_now = e.target.currentTime;
	        		el_time_val.innerHTML = SecondsTohhmmss(time_now);
	        	});

	        	var meta_loaded = false;

				el_media.onloadedmetadata = function(e) {
					if(meta_loaded===true){
						return; // just in case
					}
					// console.log('video metadata ready: ', e);
					meta_loaded = true;
					f_width = e.target.videoWidth;
					f_height = e.target.videoHeight;

					el_fname.innerHTML += ' ['+f_width+' x '+f_height+']';
	                el_media.style.width = '100%';
				   	el_time = document.createElement('div');
				   	el_time.className = 'op left-align';
				   	el_time.id = 'time';
				   	el_time_val = document.createElement('span');
				   	el_time_val.id = 'time_val';
				   	el_time_val.innerHTML = SecondsTohhmmss(time_now);
				   	btn_frame = document.createElement('button');
				   	btn_frame.className = 'btn';
				   	btn_frame.id = 'render_frame';
				   	btn_frame.innerHTML = 'choose time and render frame';

				   	btn_frame.addEventListener('click', function(e){
				   			renderFrame();
				   	});

				   	el_drop.removeChild(busy_cont);

				   	el_time.appendChild(btn_frame);
					el_time.appendChild(el_time_val);
				   	el_drop.appendChild(el_time);
				    //el_media.play();

				    objectUrlToBlob(file_blob, function(blob){
                    	file_blob_data = blob;
	                    console.log(file_blob_data);

					    // Video file ready  (file_blob / file_blob_data)


                    });


				};

				el_drop.appendChild(el_media);
				el_media.id = 'media';
				el_media.load();


            } else if(f_type.split('/')[0] === 'audio' ){

            	stat('loading audio');

            	busy_cont = createBusySpinner();
            	el_drop.appendChild(busy_cont);
                el_media = document.createElement('audio');
                el_media.setAttribute('controls', true);

				var source = document.createElement('source');
				source.type = f_type;
				source.src = file_blob;
				el_media.appendChild(source);

				el_media.addEventListener('durationchange', function(e){
					//console.log('audio durationchange: ', e);
					f_duration = e.target.duration; // in float seconds
					f_duration_fmt = SecondsTohhmmss(f_duration);

					el_fduration.innerHTML = f_duration + ' seconds ['+f_duration_fmt+']';
					el_drop.removeChild(busy_cont);
					stat('audio loaded');

                    objectUrlToBlob(file_blob, function(blob){
                    	file_blob_data = blob;
	                    console.log(file_blob_data);

	                    blobToArrayBuffer(file_blob_data, function(audio_data){
	                    	audioCtx = new (window.AudioContext || window.webkitAudioContext)();
	                    	audioCtx.decodeAudioData(audio_data, function(audio_buffer) {
								log('duration: ' + audio_buffer.duration);
								log('size: ' + audio_buffer.length);
								log('channels : ' + audio_buffer.numberOfChannels);
								log('sample rate: ' + audio_buffer.sampleRate);

								drawWaveform( audio_buffer, wave_col, wave_width, wave_height );

								// Audio file ready... (file_blob or file_blob_data)

						    });
	                    });
                    });
				});

				el_drop.appendChild(el_media);
				el_media.id = 'media';
				el_media.load();

            } else {
            	msg('unsupported file type<br><br>please try again');
            }
		}
		return false;
	}

	function drawWaveform( buffer, col, w, h ) {
		col = col || 'green';
        w || 1000;
        h || 1000;

        var canvas_wave = document.createElement('canvas');
        canvas_wave.width = w;
		canvas_wave.height = h;
		var wave_ctx = canvas_wave.getContext('2d');
		wave_ctx.fillStyle = col;

	    var data = buffer.getChannelData( 0 );
	    var step = Math.ceil( data.length / w );
	    var amp = h / 2;
	    for(var i = 0; i < w; i++){
	        var min = 1.0;
	        var max = -1.0;
	        for (var j = 0; j < step; j++) {
	            var datum = data[ (i * step) + j ];
	            if (datum < min)
	                min = datum;
	            if (datum > max)
	                max = datum;
	        }
	        wave_ctx.fillRect(i, (1 + min) * amp, 1, Math.max(1, (max - min) * amp));
	    }
	    // create a PNG from the canvas
        canvas_wave.toBlob(function(blob){
			console.log('rendered waveform image blob: ', blob);
    		var _thumb = document.createElement('img');
    		_thumb.id = 'waveform';
    		var wave_ = URL.createObjectURL(blob);
    		_thumb.src = wave_;
    		el_drop.appendChild(_thumb);
    		// blob = null;
    		log('waveform rendered: <a href="'+wave_+'" target="_blank">view</a> - <a download="wave_2_'+f_name.split( f_name.split('.')[1] ).join('png')+'" href="'+wave_+'" target="_blank">save</a>');
    		// URL.revokeObjectURL(blob)
    		canvas_wave = null;
    		wave_ctx = null;
    		buffer = null;

		}, 'image/png');

	}


	function renderFrame(){
		// console.log('render: ', time_now);
		var canvas = document.createElement('canvas');
		var ctx = canvas.getContext('2d');
		canvas.width = f_width;
		canvas.height = f_height;
		ctx.drawImage(el_media, 0, 0);

		canvas.toBlob(function(blb){
    		if(el_thumb===null){
    			el_thumb = document.createElement('img');
	    		el_thumb.className = 'thumb';
    		}
    		var frame_image = URL.createObjectURL(blb);
    		el_thumb.src = frame_image;
    		el_drop.appendChild(el_thumb);

    		log('frame @['+SecondsTohhmmss(time_now)+']: <a href="'+frame_image+'" target="_blank">view</a> - <a download="frame_'+Math.round(time_now * 1000)+'_'+f_name.split( f_name.split('.')[1] ).join('png')+'" href="'+frame_image+'" target="_blank">save</a>');

		}, 'image/png');
	}

	function objectUrlToBlob(blob_url, callback){
		var xhr = new XMLHttpRequest();
		xhr.open('GET', blob_url, true);
		xhr.responseType = 'blob';
		xhr.onload = function(e) {
		  if (this.status == 200) {
		  	callback(this.response);
		  }
		};
		xhr.send();
	}

	function blobToArrayBuffer(blob, callback) {
        console.log('blobToArrayBuffer: ', blob);
        var reader = new FileReader();
        reader.addEventListener('progress', function (e) {
            console.log('blobToArrayBuffer progress : ', e);
        });
        reader.addEventListener('load', function (e) {
            console.log('blobToArrayBuffer loaded : ', e);
            callback(e.target.result);
        });
        reader.addEventListener('error', function (e) {
            console.log('blobToArrayBuffer error', e);
        });
        reader.readAsArrayBuffer(blob);
    }

	// Canvas.toBlob() polyfill : https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob#Polyfill
	if (!HTMLCanvasElement.prototype.toBlob) {
	 Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
	  value: function (callback, type, quality) {
	  	var _dat = this.toDataURL(type, quality);
	    var binStr = atob( _dat.split(',')[1] ),
	        len = binStr.length,
	        arr = new Uint8Array(len);

	    for (var i=0; i<len; i++ ) {
	     arr[i] = binStr.charCodeAt(i);
	    }
	    _dat = null;
	    binStr = null;
	    callback( new Blob( [arr], {type: type || 'image/png'} ) );
	  }
	 });
	}

	function log(message) {
        var li = document.createElement('li');
        li.innerHTML = message;
        logs.appendChild(li);
    }

	function removeAllChildren(theParent){
	    // Create the Range object
	    var rangeObj = new Range();
	    // Select all of theParent's children
	    rangeObj.selectNodeContents(theParent);
	    // Delete everything that is selected
	    rangeObj.deleteContents();
	}

	function dataURItoBlob(dataURI) {
	  // convert base64 to raw binary data held in a string
	  // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
	  var byteString = atob(dataURI.split(',')[1]);
	  // separate out the mime component
	  var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
	  // write the bytes of the string to an ArrayBuffer
	  var ab = new ArrayBuffer(byteString.length);
	  var ia = new Uint8Array(ab);
	  for (var i = 0; i < byteString.length; i++) {
	      ia[i] = byteString.charCodeAt(i);
	  }
	  // write the ArrayBuffer to a blob, and you're done
	  var blob = new Blob([ab], {type: mimeString});
	  return blob;
	}

    var SecondsTohhmmss = function(totalSeconds) {
	  var hours   = Math.floor(totalSeconds / 3600);
	  var minutes = Math.floor((totalSeconds - (hours * 3600)) / 60);
	  var seconds = totalSeconds - (hours * 3600) - (minutes * 60);

	  // round seconds
	  seconds = Math.round(seconds * 100) / 100

	  var result = (hours < 10 ? "0" + hours : hours);
	      result += ":" + (minutes < 10 ? "0" + minutes : minutes);
	      result += ":" + (seconds  < 10 ? "0" + seconds : seconds);
	  return result;
	}


</script>


<style type="text/css">
	img#media{
		width: 100%;
	}
	audio#media{
		width: 100%;
		height: 40px;
		z-index: 1;
	}
	video#media{
		z-index: 1;
	}
	#droptarget{
		text-align: center;
		border: 4px dashed #ddd;
		padding: 6px;
		margin: 6px;
		font-family: monospace;
		font-weight: bold;
		font-size: 20px;
		position: relative;
		background: #eee;
	}
	#droptarget > p{
		padding: 20px;
	}
	.op{
		border: 1px solid #777;
		padding: 6px;
		margin: 6px;
		background: #eee;
		color: #222;
		font-family: monospace;
	}
	#status{
		background: #222;
		color: #eee;
		font-weight: bold;
	}
	#busy{
		position: relative;
		width: 60px;
		height: 60px;
		background: #333;
		border-radius: 30px;
		text-align: center;
		overflow: hidden;
		left: calc(50% - 30px);
		top: calc(50% - 30px);
	}
	#dot{
		position: relative;
		width: 10px;
		height: 10px;
		margin: 12px;
		background: #fff;
		border-radius: 5px;
	}
	#busy_cont{
		top:0px;
		left:0px;
		right: 0px;
		bottom: 0px;
		z-index: 1000;
		background: rgba(255,255,255,0.8);
		width: 100%;
		height: 100%;
		position: absolute;
	}
	li{
		line-height: 1.8em;
	}
	.thumb{
		width: 100%;
	}
	#time{
		font-size: 18px;
	}

	@-webkit-keyframes webkit-anim-rotate {
	  0% {
	    transform: rotate(0);
	    -webkit-transform: rotate(0);
	  }
	  100% {
	    transform: rotate(359deg);
	    -webkit-transform: rotate(359deg);
	  }
	}
	@-moz-keyframes moz-anim-rotate {
	  0% {
	    -moz-transform: rotate(0);
	  }
	  100% {
	    -moz-transform: rotate(359deg);
	  }
	}
	@-ms-keyframes ms-anim-rotate {
	  0% {
	    -ms-transform: rotate(0);
	  }
	  100% {
	    -ms-transform: rotate(359deg);
	  }
	}
	@-o-keyframes o-anim-rotate {
	  0% {
	    -o-transform: rotate(0);
	  }
	  100% {
	    -o-transform: rotate(359deg);
	  }
	}
	@keyframes anim-rotate {
	  0% {
	    transform: rotate(0);
	  }
	  100% {
	    transform: rotate(359deg);
	  }
	}

	.btn{
		font-family: sans-serif;
		color: white;
		background: #333;
		font-size: 13px;
	}
	#render_frame{
		float: right;

	}
	.left-align{
		text-align: left;
	}
	.spinner {
	    -webkit-animation: webkit-anim-rotate 2s infinite linear;
	    -moz-animation: moz-anim-rotate 2s infinite linear;
	    -ms-animation: ms-anim-rotate 2s infinite linear;
	    -o-animation: o-anim-rotate 2s infinite linear;
	    animation: anim-rotate 2s infinite linear;
	}

	#wave_holder{
        margin-left: 0px;
        margin-right: 0px;
        border:0px solid #ccc;
        height: 800px;
        top:100px;
        position: relative;
        visibility: hidden;
    }

    #wave{
        left:0;
        right:0;
        text-align: left;
        position: absolute;
        top:0px;
        height: 800px;
        overflow:hidden;
    }
    #wave_centre{
        width: 100%;
        height: 1px;
        background: #888;
        position: absolute;
        top:50%;
    }

    img#waveform{
    	width: 100%;
    }

    @media all and (min-width:600px) {
    	#droptarget{
    		width:60%;
    		float: right;
    	}
    	#info{
    		width: 34%;
    		float: left;
    	}
    }

    #lnk{
    	position: absolute;
    	bottom: 10px;
    	right:10px;
    }

    button#clear{
    	background: #660000;
    	color: white;
    	width: 22px;
    	height: 22px;
    	border-radius: 11px;
    	font-size: 11px;
    	line-height: 6px;
    	text-align: center;
    	padding: 0px;
    	margin-left: 4px;
    	outline: none;
    }

</style>

</head>

<body onload="init()">

<div id="droptarget" ondrop="drop(event)" ondragleave="dragout()" ondragover="allowDrop(event)">
	<p>
		drop a media file here
		<span style="font-size:12px"><br>(jpg, gif, png, mp3, wav, m4a, ogg, mp4, m4v, avi) </span>
	</p>

</div>

<div id="info">
	<div class="op" id="f_name">.</div>
	<div class="op" id="f_type">.</div>
	<div class="op" id="f_size">.</div>
	<div class="op" id="f_duration">.</div>
	<div class="op" id="status">.</div>
	<div class="op" id="logs">
		<h6 style="margin:0">OUTPUT LOGS:</h6>
	</div>
	<div id="clear-logs"><button id="clear">x</button></div>
</div>


<div id="lnk"><a href="http://github.com/kosso">@kosso</a></div>


</body>
</html>