tests: Add a test for AAC decoding

tests/tests/swfs/audio/aac/NOTE.txt

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+ 
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=44100" -af "volume=5" -ac 2 -c:a aac tone_stereo_44100hz.flv
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=48000" -af "volume=5" -ac 2 -c:a aac tone_stereo_48000hz.flv
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=22050" -af "volume=5" -ac 2 -c:a aac tone_stereo_22050hz.flv
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=44100" -af "volume=5" -ac 1 -c:a aac tone_mono_44100hz.flv
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=48000" -af "volume=5" -ac 1 -c:a aac tone_mono_48000hz.flv
+ ffmpeg -f lavfi -i "sine=frequency=444:duration=1:sample_rate=22050" -af "volume=5" -ac 1 -c:a aac tone_mono_22050hz.flv

tests/tests/swfs/audio/aac/Test.as

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+package {
+	import flash.events.Event;
+	import flash.display.MovieClip;
+	import flash.media.Video;
+	import flash.net.URLRequest;
+	import flash.net.NetStream;
+	import flash.net.NetConnection;
+	import flash.utils.setTimeout;
+	import flash.media.SoundMixer;
+	import flash.utils.ByteArray;
+
+	public class Test {
+		
+		public static function startTone(main:MovieClip, file:String) {
+			trace("Starting tone:", file);
+			
+			var connection:NetConnection = new NetConnection();
+			connection.connect(null);
+
+			var Client:Object = new Object();
+			Client.onMetaData = function(e) {};
+			
+			var stream = new NetStream(connection);
+			stream.client = Client;
+			stream.play(file);
+
+			var video = new Video();
+			video.attachNetStream(stream);
+			main.addChild(video);
+		}
+		
+		public static function measureChannel(ba: ByteArray, f: Number) : Number {
+			var sinSum = 0.0;
+			var cosSum = 0.0;
+			// The first multiplication by 2 is because of the buggy stretch factor
+			// (we only get every second sample).
+			var coeff = f * 2 * Math.PI * 2 / 44100.0;
+			
+            for (var j:uint=0; j<256; j++) {
+                var sp = ba.readFloat();
+				var arg = j * coeff;
+				sinSum += sp * Math.sin(arg);
+				cosSum += sp * Math.cos(arg);
+            }
+			sinSum /= 256.0;
+			cosSum /= 256.0;
+			
+			return Math.sqrt(sinSum * sinSum + cosSum * cosSum);
+		}
+		
+		public static function getFreq(ba: ByteArray, f: Number) : Number {
+			ba.position = 0;
+			
+			// The default FFmpeg amplitude is 1/8, and we multiply that by 5.
+			// Then, with stereo, it gets lowered by 3 dB to split the power between channels.
+			
+			var leftAmpl = measureChannel(ba, f);
+			var rightAmpl = measureChannel(ba, f);
+			
+			if (Math.abs(leftAmpl - rightAmpl) >= 0.01) {
+				trace("FAIL: Channel mismatch!");
+			}
+			// Just in case...
+			var avgAmpl = (leftAmpl + rightAmpl) / 2;
+
+			// The first multiplication by two is to compensate for the stretch factor bug
+			// (us only getting every second sample), the 8 is undoing the default
+			// sine amplitude of FFmpeg, and the 5 undoes our own volume scaling.
+			return avgAmpl * 2 * 8 / 5;
+		}
+		
+		public static function doTest(main: MovieClip) {
+			var flvs = [
+				"tone_mono_22050hz.flv",
+				"tone_mono_44100hz.flv",
+				"tone_mono_48000hz.flv",
+				"tone_stereo_22050hz.flv",
+				"tone_stereo_44100hz.flv",
+				"tone_stereo_48000hz.flv",
+			];
+			
+			for (var i in flvs) {
+				(function(i:int) {
+				 
+					setTimeout(function(e){
+						startTone(main, flvs[i]);
+					}, i*2000);
+					
+					setTimeout(function(e){
+						trace("Measuring...");
+						
+        				var byteArr:ByteArray = new ByteArray();
+                		SoundMixer.computeSpectrum(byteArr);
+						
+						var fakeFactors = [
+						  2,
+						  2 * 2,
+						  48000.0/44100.0,
+						  2 * 48000.0/44100.0,
+						  4 * 48000.0/44100.0,
+						  0.5 * 48000.0/44100.0,
+						  0.25 * 48000.0/44100.0,
+						];
+						for (var ff in fakeFactors) {
+							var freq1 = 444 * fakeFactors[ff];
+							var freq2 = 444 / fakeFactors[ff];
+							
+							trace("Fake freqs:", Math.round(freq1), Math.round(freq2));
+							
+							var meas1 = getFreq(byteArr, freq1);
+							var meas2 = getFreq(byteArr, freq2);
+							if (i >= 3) {
+								// compensating for the stereo upmix power division
+								meas1 *= Math.pow(10, 3/20);
+								meas2 *= Math.pow(10, 3/20);
+							}
+							
+							// No frequency can be absent entirely, and no frequency other than the main
+							// one can be too strong.
+							if (meas1 < 1e-6 || meas2 < 1e-6 || meas1 >= 0.9 || meas2 >= 0.9) {
+								trace("FAIL");
+							}
+							else {
+								trace("PASS");
+							}
+						}
+						
+						var meas = getFreq(byteArr, 444);
+						if (i >= 3) {
+							meas *= Math.pow(10, 3/20); // compensating for the stereo upmix power division
+						}
+						trace("Actual freq:");
+						if (meas >= 0.95 && meas <= 1.05) {
+							trace("PASS");
+						}
+						else {
+							trace("FAIL");
+						}
+					}, i*2000 + 800);
+					
+				})(i);
+			}
+			
+		}
+	}
+}

tests/tests/swfs/audio/aac/output.txt

@@ -0,0 +1,108 @@
+Starting tone: tone_mono_22050hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS
+Starting tone: tone_mono_44100hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS
+Starting tone: tone_mono_48000hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS
+Starting tone: tone_stereo_22050hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS
+Starting tone: tone_stereo_44100hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS
+Starting tone: tone_stereo_48000hz.flv
+Measuring...
+Fake freqs: 888 222
+PASS
+Fake freqs: 1776 111
+PASS
+Fake freqs: 483 408
+PASS
+Fake freqs: 967 204
+PASS
+Fake freqs: 1933 102
+PASS
+Fake freqs: 242 816
+PASS
+Fake freqs: 121 1632
+PASS
+Actual freq:
+PASS

tests/tests/swfs/audio/aac/test.toml

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+num_ticks = 120
+
+[player_options]
+with_audio = true