Add on{Audio/Video}Decode callbacks, meassure perf

src/mp2-wasm.js

 var MP2WASM = function(options) {
 	JSMpeg.Decoder.Base.call(this, options);
 
+	this.onDecodeCallback = options.onAudioDecode;
 	this.module = options.wasmModule;
 
 	this.bufferSize = options.audioBufferSize || 128*1024;
 };
 
 MP2WASM.prototype.decode = function() {
-	if (!this.decoder) { return; }
-	
-	var decodedBytes = this.functions._mp2_decoder_decode(this.decoder);
+	var startTime = JSMpeg.Now();
+
+	if (!this.decoder) {
+		return false;
+	}	
 
+	var decodedBytes = this.functions._mp2_decoder_decode(this.decoder);
 	if (decodedBytes === 0) {
 		return false;
 	}
 	}
 
 	this.advanceDecodedTime(MP2WASM.SAMPLES_PER_FRAME / this.sampleRate);
+
+	var elapsedTime = JSMpeg.Now() - startTime;
+	if (this.onDecodeCallback) {
+		this.onDecodeCallback(this, elapsedTime);
+	}
 	return true;
 };
 

src/mp2.js

 var MP2 = function(options) {
 	JSMpeg.Decoder.Base.call(this, options);
 
+	this.onDecodeCallback = options.onAudioDecode;
+
 	var bufferSize = options.audioBufferSize || 128*1024;
 	var bufferMode = options.streaming
 		? JSMpeg.BitBuffer.MODE.EVICT
 MP2.prototype.constructor = MP2;
 
 MP2.prototype.decode = function() {
+	var startTime = JSMpeg.Now();
+
 	var pos = this.bits.index >> 3;
 	if (pos >= this.bits.byteLength) {
 		return false;
 
 	var decoded = this.decodeFrame(this.left, this.right);
 	this.bits.index = (pos + decoded) << 3;
-
 	if (!decoded) {
 		return false;
 	}
 	}
 
 	this.advanceDecodedTime(this.left.length / this.sampleRate);
+
+	var elapsedTime = JSMpeg.Now() - startTime;
+	if (this.onDecodeCallback) {
+		this.onDecodeCallback(this, elapsedTime);
+	}
 	return true;
 };
 

src/mpeg1-wasm.js

 var MPEG1WASM = function(options) {
 	JSMpeg.Decoder.Base.call(this, options);
 
+	this.onDecodeCallback = options.onVideoDecode;
 	this.module = options.wasmModule;
 
 	this.bufferSize = options.videoBufferSize || 512*1024;
 };
 
 MPEG1WASM.prototype.decode = function() {
-	if (!this.decoder) { return; }
-	
-	var didDecode = this.functions._mpeg1_decoder_decode(this.decoder);
+	var startTime = JSMpeg.Now();
 
+	if (!this.decoder) {
+		return false;
+	}
+
+	var didDecode = this.functions._mpeg1_decoder_decode(this.decoder);
 	if (!didDecode) {
 		return false;
 	}
 	}
 
 	this.advanceDecodedTime(1/this.frameRate);
+
+	var elapsedTime = JSMpeg.Now() - startTime;
+	if (this.onDecodeCallback) {
+		this.onDecodeCallback(this, elapsedTime);
+	}
 	return true;
 };
 

src/mpeg1.js

 var MPEG1 = function(options) {
 	JSMpeg.Decoder.Base.call(this, options);
 
+	this.onDecodeCallback = options.onVideoDecode;
+
 	var bufferSize = options.videoBufferSize || 512*1024;
 	var bufferMode = options.streaming
 		? JSMpeg.BitBuffer.MODE.EVICT
 };
 
 MPEG1.prototype.decode = function() {
+	var startTime = JSMpeg.Now();
+	
 	if (!this.hasSequenceHeader) {
 		return false;
 	}
 
 	this.decodePicture();
 	this.advanceDecodedTime(1/this.frameRate);
+
+	var elapsedTime = JSMpeg.Now() - startTime;
+	if (this.onDecodeCallback) {
+		this.onDecodeCallback(this, elapsedTime);
+	}
 	return true;
 };