Fix MIDI event array traversal in TrackChunk.java and TrackEvent.java

- Corrected trackEventBytes traversal in TrackChunk where the array position marker was not incremented properly, leading to duplicate sample output.
- Amended TrackEvent "Meta Event" parsing to account for the length of variable length bytes.
- Fixed a bug with TrackEvent message parsing where message data was parsed incorrectly due to miscalculated length.

PiperOrigin-RevId: 456967968

libraries/test_data/src/test/assets/extractordumps/midi/Twinkle.mid.0.dump

@@ -4,8 +4,8 @@ seekMap:
   getPosition(0) = [[timeUs=0, position=0]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 264
+  total output bytes = 96
-  sample count = 86
+  sample count = 30
   format 0:
     sampleMimeType = audio/midi
   sample 0:
@@ -21,335 +21,111 @@ track 0:
     flags = 1
     data = length 3, hash FFFED75B
   sample 3:
-    time = 2108
+    time = 128
     flags = 1
-    data = length 3, hash FFFED448
+    data = length 3, hash FFFED733
   sample 4:
-    time = 2148
+    time = 128
     flags = 1
-    data = length 3, hash FFFE9730
+    data = length 3, hash FFFED751
   sample 5:
-    time = 2276
+    time = 256
     flags = 1
     data = length 3, hash FFFED733
   sample 6:
-    time = 4384
+    time = 256
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 7:
-    time = 4384
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 8:
-    time = 4384
-    flags = 1
-    data = length 3, hash FFFED751
-  sample 9:
-    time = 6492
-    flags = 1
-    data = length 3, hash FFFED312
-  sample 10:
-    time = 6522
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 11:
-    time = 6650
-    flags = 1
-    data = length 3, hash FFFED733
-  sample 12:
-    time = 8758
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 13:
-    time = 8758
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 14:
-    time = 8758
     flags = 1
     data = length 3, hash FFFED839
-  sample 15:
+  sample 7:
-    time = 10873
+    time = 384
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 16:
-    time = 10918
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 17:
-    time = 11046
     flags = 1
     data = length 3, hash FFFED80C
-  sample 18:
+  sample 8:
-    time = 13161
+    time = 384
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 19:
-    time = 13161
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 20:
-    time = 13161
     flags = 1
     data = length 3, hash FFFED83E
-  sample 21:
+  sample 9:
-    time = 15276
+    time = 512
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 22:
-    time = 15326
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 23:
-    time = 15454
     flags = 1
     data = length 3, hash FFFED80C
-  sample 24:
+  sample 10:
-    time = 17569
+    time = 512
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 25:
-    time = 17569
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 26:
-    time = 17569
     flags = 1
     data = length 3, hash FFFED877
-  sample 27:
+  sample 11:
-    time = 19686
+    time = 640
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 28:
-    time = 19731
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 29:
-    time = 19859
     flags = 1
     data = length 3, hash FFFED84A
-  sample 30:
+  sample 12:
-    time = 21976
+    time = 640
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 31:
-    time = 21976
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 32:
-    time = 21976
     flags = 1
     data = length 3, hash FFFED87C
-  sample 33:
+  sample 13:
-    time = 24093
+    time = 768
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 34:
-    time = 24143
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 35:
-    time = 24271
     flags = 1
     data = length 3, hash FFFED84A
-  sample 36:
+  sample 14:
-    time = 26388
+    time = 768
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 37:
-    time = 26388
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 38:
-    time = 26388
     flags = 1
     data = length 3, hash FFFED82F
-  sample 39:
+  sample 15:
-    time = 28503
+    time = 1024
-    flags = 1
-    data = length 3, hash FFFED3AE
-  sample 40:
-    time = 28538
-    flags = 1
-    data = length 3, hash FFFE9AF1
-  sample 41:
-    time = 28794
     flags = 1
     data = length 3, hash FFFED80C
-  sample 42:
+  sample 16:
-    time = 30909
+    time = 1024
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 43:
-    time = 30909
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 44:
-    time = 30909
     flags = 1
     data = length 3, hash FFFED800
-  sample 45:
+  sample 17:
-    time = 33022
+    time = 1152
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 46:
-    time = 33072
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 47:
-    time = 33200
     flags = 1
     data = length 3, hash FFFED7CE
-  sample 48:
+  sample 18:
-    time = 35313
+    time = 1152
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 49:
-    time = 35313
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 50:
-    time = 35313
     flags = 1
     data = length 3, hash FFFED7FB
-  sample 51:
+  sample 19:
-    time = 37426
+    time = 1280
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 52:
-    time = 37471
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 53:
-    time = 37599
     flags = 1
     data = length 3, hash FFFED7CE
-  sample 54:
+  sample 20:
-    time = 39712
+    time = 1280
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 55:
-    time = 39712
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 56:
-    time = 39712
     flags = 1
     data = length 3, hash FFFED7E1
-  sample 57:
+  sample 21:
-    time = 41824
+    time = 1344
-    flags = 1
-    data = length 3, hash FFFED63D
-  sample 58:
-    time = 41874
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 59:
-    time = 41938
     flags = 1
     data = length 3, hash FFFED7AF
-  sample 60:
+  sample 22:
-    time = 44050
+    time = 1408
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 61:
-    time = 44050
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 62:
-    time = 44114
     flags = 1
     data = length 3, hash FFFED7D7
-  sample 63:
+  sample 23:
-    time = 46226
+    time = 1472
-    flags = 1
-    data = length 3, hash FFFED507
-  sample 64:
-    time = 46266
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 65:
-    time = 46330
     flags = 1
     data = length 3, hash FFFED7AF
-  sample 66:
+  sample 24:
-    time = 48442
+    time = 1536
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 67:
-    time = 48442
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 68:
-    time = 48506
     flags = 1
     data = length 3, hash FFFED79E
-  sample 69:
+  sample 25:
-    time = 50616
+    time = 1600
-    flags = 1
-    data = length 3, hash FFFED5A2
-  sample 70:
-    time = 50661
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 71:
-    time = 50725
     flags = 1
     data = length 3, hash FFFED771
-  sample 72:
+  sample 26:
-    time = 52835
+    time = 1664
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 73:
-    time = 52835
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 74:
-    time = 52899
     flags = 1
     data = length 3, hash FFFED7A3
-  sample 75:
+  sample 27:
-    time = 55009
+    time = 1728
-    flags = 1
-    data = length 3, hash FFFED63D
-  sample 76:
-    time = 55059
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 77:
-    time = 55123
     flags = 1
     data = length 3, hash FFFED771
-  sample 78:
+  sample 28:
-    time = 57233
+    time = 1792
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 79:
-    time = 57233
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 80:
-    time = 57297
     flags = 1
     data = length 3, hash FFFED751
-  sample 81:
+  sample 29:
-    time = 59405
+    time = 2048
-    flags = 1
-    data = length 3, hash FFFED313
-  sample 82:
-    time = 59435
-    flags = 1
-    data = length 3, hash FFFE9AF1
-  sample 83:
-    time = 59691
     flags = 1
     data = length 3, hash FFFED733
-  sample 84:
-    time = 61799
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 85:
-    time = 61799
-    flags = 1
-    data = length 3, hash FFFECFEE
 tracksEnded = true

libraries/test_data/src/test/assets/extractordumps/midi/Twinkle.mid.unknown_length.dump

@@ -4,8 +4,8 @@ seekMap:
   getPosition(0) = [[timeUs=0, position=0]]
 numberOfTracks = 1
 track 0:
-  total output bytes = 264
+  total output bytes = 96
-  sample count = 86
+  sample count = 30
   format 0:
     sampleMimeType = audio/midi
   sample 0:
@@ -21,335 +21,111 @@ track 0:
     flags = 1
     data = length 3, hash FFFED75B
   sample 3:
-    time = 2108
+    time = 128
     flags = 1
-    data = length 3, hash FFFED448
+    data = length 3, hash FFFED733
   sample 4:
-    time = 2148
+    time = 128
     flags = 1
-    data = length 3, hash FFFE9730
+    data = length 3, hash FFFED751
   sample 5:
-    time = 2276
+    time = 256
     flags = 1
     data = length 3, hash FFFED733
   sample 6:
-    time = 4384
+    time = 256
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 7:
-    time = 4384
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 8:
-    time = 4384
-    flags = 1
-    data = length 3, hash FFFED751
-  sample 9:
-    time = 6492
-    flags = 1
-    data = length 3, hash FFFED312
-  sample 10:
-    time = 6522
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 11:
-    time = 6650
-    flags = 1
-    data = length 3, hash FFFED733
-  sample 12:
-    time = 8758
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 13:
-    time = 8758
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 14:
-    time = 8758
     flags = 1
     data = length 3, hash FFFED839
-  sample 15:
+  sample 7:
-    time = 10873
+    time = 384
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 16:
-    time = 10918
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 17:
-    time = 11046
     flags = 1
     data = length 3, hash FFFED80C
-  sample 18:
+  sample 8:
-    time = 13161
+    time = 384
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 19:
-    time = 13161
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 20:
-    time = 13161
     flags = 1
     data = length 3, hash FFFED83E
-  sample 21:
+  sample 9:
-    time = 15276
+    time = 512
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 22:
-    time = 15326
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 23:
-    time = 15454
     flags = 1
     data = length 3, hash FFFED80C
-  sample 24:
+  sample 10:
-    time = 17569
+    time = 512
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 25:
-    time = 17569
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 26:
-    time = 17569
     flags = 1
     data = length 3, hash FFFED877
-  sample 27:
+  sample 11:
-    time = 19686
+    time = 640
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 28:
-    time = 19731
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 29:
-    time = 19859
     flags = 1
     data = length 3, hash FFFED84A
-  sample 30:
+  sample 12:
-    time = 21976
+    time = 640
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 31:
-    time = 21976
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 32:
-    time = 21976
     flags = 1
     data = length 3, hash FFFED87C
-  sample 33:
+  sample 13:
-    time = 24093
+    time = 768
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 34:
-    time = 24143
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 35:
-    time = 24271
     flags = 1
     data = length 3, hash FFFED84A
-  sample 36:
+  sample 14:
-    time = 26388
+    time = 768
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 37:
-    time = 26388
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 38:
-    time = 26388
     flags = 1
     data = length 3, hash FFFED82F
-  sample 39:
+  sample 15:
-    time = 28503
+    time = 1024
-    flags = 1
-    data = length 3, hash FFFED3AE
-  sample 40:
-    time = 28538
-    flags = 1
-    data = length 3, hash FFFE9AF1
-  sample 41:
-    time = 28794
     flags = 1
     data = length 3, hash FFFED80C
-  sample 42:
+  sample 16:
-    time = 30909
+    time = 1024
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 43:
-    time = 30909
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 44:
-    time = 30909
     flags = 1
     data = length 3, hash FFFED800
-  sample 45:
+  sample 17:
-    time = 33022
+    time = 1152
-    flags = 1
-    data = length 3, hash FFFED57E
-  sample 46:
-    time = 33072
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 47:
-    time = 33200
     flags = 1
     data = length 3, hash FFFED7CE
-  sample 48:
+  sample 18:
-    time = 35313
+    time = 1152
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 49:
-    time = 35313
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 50:
-    time = 35313
     flags = 1
     data = length 3, hash FFFED7FB
-  sample 51:
+  sample 19:
-    time = 37426
+    time = 1280
-    flags = 1
-    data = length 3, hash FFFED4E3
-  sample 52:
-    time = 37471
-    flags = 1
-    data = length 3, hash FFFE9730
-  sample 53:
-    time = 37599
     flags = 1
     data = length 3, hash FFFED7CE
-  sample 54:
+  sample 20:
-    time = 39712
+    time = 1280
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 55:
-    time = 39712
-    flags = 1
-    data = length 3, hash FFFECF7F
-  sample 56:
-    time = 39712
     flags = 1
     data = length 3, hash FFFED7E1
-  sample 57:
+  sample 21:
-    time = 41824
+    time = 1344
-    flags = 1
-    data = length 3, hash FFFED63D
-  sample 58:
-    time = 41874
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 59:
-    time = 41938
     flags = 1
     data = length 3, hash FFFED7AF
-  sample 60:
+  sample 22:
-    time = 44050
+    time = 1408
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 61:
-    time = 44050
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 62:
-    time = 44114
     flags = 1
     data = length 3, hash FFFED7D7
-  sample 63:
+  sample 23:
-    time = 46226
+    time = 1472
-    flags = 1
-    data = length 3, hash FFFED507
-  sample 64:
-    time = 46266
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 65:
-    time = 46330
     flags = 1
     data = length 3, hash FFFED7AF
-  sample 66:
+  sample 24:
-    time = 48442
+    time = 1536
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 67:
-    time = 48442
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 68:
-    time = 48506
     flags = 1
     data = length 3, hash FFFED79E
-  sample 69:
+  sample 25:
-    time = 50616
+    time = 1600
-    flags = 1
-    data = length 3, hash FFFED5A2
-  sample 70:
-    time = 50661
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 71:
-    time = 50725
     flags = 1
     data = length 3, hash FFFED771
-  sample 72:
+  sample 26:
-    time = 52835
+    time = 1664
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 73:
-    time = 52835
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 74:
-    time = 52899
     flags = 1
     data = length 3, hash FFFED7A3
-  sample 75:
+  sample 27:
-    time = 55009
+    time = 1728
-    flags = 1
-    data = length 3, hash FFFED63D
-  sample 76:
-    time = 55059
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 77:
-    time = 55123
     flags = 1
     data = length 3, hash FFFED771
-  sample 78:
+  sample 28:
-    time = 57233
+    time = 1792
-    flags = 1
-    data = length 3, hash FFFED02F
-  sample 79:
-    time = 57233
-    flags = 1
-    data = length 3, hash FFFED73F
-  sample 80:
-    time = 57297
     flags = 1
     data = length 3, hash FFFED751
-  sample 81:
+  sample 29:
-    time = 59405
+    time = 2048
-    flags = 1
-    data = length 3, hash FFFED313
-  sample 82:
-    time = 59435
-    flags = 1
-    data = length 3, hash FFFE9AF1
-  sample 83:
-    time = 59691
     flags = 1
     data = length 3, hash FFFED733
-  sample 84:
-    time = 61799
-    flags = 1
-    data = length 3, hash FFFECFEF
-  sample 85:
-    time = 61799
-    flags = 1
-    data = length 3, hash FFFECFEE
 tracksEnded = true