SongSel: Add browse for local songs button

public/src/js/soundbuffer.js

@@ -4,10 +4,19 @@
 		this.context = new AudioContext()
 		pageEvents.add(window, ["click", "touchend"], this.pageClicked.bind(this))
 	}
-	load(url, gain){
-		return loader.ajax(url, request => {
-			request.responseType = "arraybuffer"
-		}).then(response => {
+	load(url, local, gain){
+		if(local){
+			var reader = new FileReader()
+			var loadPromise = pageEvents.load(reader).then(event => {
+				return event.target.result
+			})
+			reader.readAsArrayBuffer(url)
+		}else{
+			var loadPromise = loader.ajax(url, request => {
+				request.responseType = "arraybuffer"
+			})
+		}
+		return loadPromise.then(response => {
 			return new Promise((resolve, reject) => {
 				return this.context.decodeAudioData(response, resolve, reject)
 			}).catch(error => {
@@ -66,8 +75,8 @@ class SoundGain{
 		}
 		this.setVolume(1)
 	}
-	load(url){
-		return this.soundBuffer.load(url, this)
+	load(url, local){
+		return this.soundBuffer.load(url, local, this)
 	}
 	convertTime(time, absolute){
 		return this.soundBuffer.convertTime(time, absolute)