From 17bf47ed24dede6b864b88e99ffc343ea78d5132 Mon Sep 17 00:00:00 2001
From: ibaker <ibaker@google.com>
Date: Tue, 21 May 2024 05:28:34 -0700
Subject: [PATCH] MP3: Add test CBR sample with 'too small' `PCUT` frame

This shows ExoPlayer currently wrongly reports the duration of this
sample, because it assumes every frame is 32kbps (104 bytes) due to the
`PCUT` frame immediately after the `Info` frame.

A follow-up change will modify `Info` frame handling to resolve this
issue.

This sample was crafted using a hex editor to insert the additional
`PCUT` frame (the pattern of `null` and `x` is taken from the sample
file in Issue: androidx/media#1376, the header is modified to set the channel count
to 1 to match the rest of the file), and then update the frame count
and data size of the `Info` header to match.

Issue: androidx/media#1376
PiperOrigin-RevId: 635772837
---
 .../extractor/mp3/Mp3ExtractorTest.java       |   7 +
 ...test-cbr-info-header-pcut-frame.mp3.0.dump | 185 ++++++++++++++++++
 ...test-cbr-info-header-pcut-frame.mp3.1.dump | 129 ++++++++++++
 ...test-cbr-info-header-pcut-frame.mp3.2.dump |  73 +++++++
 ...test-cbr-info-header-pcut-frame.mp3.3.dump |  21 ++
 ...-header-pcut-frame.mp3.unknown_length.dump | 185 ++++++++++++++++++
 .../mp3/test-cbr-info-header-pcut-frame.mp3   | Bin 0 -> 8690 bytes
 7 files changed, 600 insertions(+)
 create mode 100644 libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.0.dump
 create mode 100644 libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.1.dump
 create mode 100644 libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.2.dump
 create mode 100644 libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.3.dump
 create mode 100644 libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.unknown_length.dump
 create mode 100644 libraries/test_data/src/test/assets/media/mp3/test-cbr-info-header-pcut-frame.mp3

diff --git a/libraries/extractor/src/test/java/androidx/media3/extractor/mp3/Mp3ExtractorTest.java b/libraries/extractor/src/test/java/androidx/media3/extractor/mp3/Mp3ExtractorTest.java
index cacb094742..8900629912 100644
--- a/libraries/extractor/src/test/java/androidx/media3/extractor/mp3/Mp3ExtractorTest.java
+++ b/libraries/extractor/src/test/java/androidx/media3/extractor/mp3/Mp3ExtractorTest.java
@@ -47,6 +47,13 @@ public final class Mp3ExtractorTest {
         Mp3Extractor::new, "media/mp3/test-cbr-info-header.mp3", simulationConfig);
   }
 
+  // https://github.com/androidx/media/issues/1376#issuecomment-2117393653
+  @Test
+  public void mp3SampleWithInfoHeaderAndPcutFrame() throws Exception {
+    ExtractorAsserts.assertBehavior(
+        Mp3Extractor::new, "media/mp3/test-cbr-info-header-pcut-frame.mp3", simulationConfig);
+  }
+
   @Test
   public void mp3SampleWithCbrSeeker() throws Exception {
     ExtractorAsserts.assertBehavior(
diff --git a/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.0.dump b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.0.dump
new file mode 100644
index 0000000000..67c6563098
--- /dev/null
+++ b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.0.dump
@@ -0,0 +1,185 @@
+seekMap:
+  isSeekable = true
+  duration = 2115750
+  getPosition(0) = [[timeUs=0, position=227]]
+  getPosition(1) = [[timeUs=0, position=227], [timeUs=26000, position=331]]
+  getPosition(1057875) = [[timeUs=1040000, position=4387], [timeUs=1066000, position=4491]]
+  getPosition(2115750) = [[timeUs=2089750, position=8586]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 8463
+  sample count = 41
+  format 0:
+    averageBitrate = 32000
+    sampleMimeType = audio/mpeg
+    maxInputSize = 4096
+    channelCount = 1
+    sampleRate = 44100
+    encoderDelay = 576
+    encoderPadding = 1404
+    metadata = entries=[TSSE: description=null: values=[Lavf58.45.100]]
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 104, hash BF3B0C83
+  sample 1:
+    time = 26122
+    flags = 1
+    data = length 208, hash 5E56C6DF
+  sample 2:
+    time = 52244
+    flags = 1
+    data = length 209, hash 4FA4483
+  sample 3:
+    time = 78367
+    flags = 1
+    data = length 209, hash E1201788
+  sample 4:
+    time = 104489
+    flags = 1
+    data = length 209, hash FDB8052B
+  sample 5:
+    time = 130612
+    flags = 1
+    data = length 209, hash A8FF2C9
+  sample 6:
+    time = 156734
+    flags = 1
+    data = length 209, hash FD4AE506
+  sample 7:
+    time = 182857
+    flags = 1
+    data = length 209, hash EA0AC2FE
+  sample 8:
+    time = 208979
+    flags = 1
+    data = length 209, hash 84B9DDE0
+  sample 9:
+    time = 235102
+    flags = 1
+    data = length 209, hash 796A4F65
+  sample 10:
+    time = 261224
+    flags = 1
+    data = length 209, hash 4DE92719
+  sample 11:
+    time = 287346
+    flags = 1
+    data = length 209, hash 458A4711
+  sample 12:
+    time = 313469
+    flags = 1
+    data = length 209, hash 27954F2B
+  sample 13:
+    time = 339591
+    flags = 1
+    data = length 209, hash 1A5042B0
+  sample 14:
+    time = 365714
+    flags = 1
+    data = length 209, hash 6CCBBB3B
+  sample 15:
+    time = 391836
+    flags = 1
+    data = length 209, hash 34191E1
+  sample 16:
+    time = 417959
+    flags = 1
+    data = length 209, hash 57323ED7
+  sample 17:
+    time = 444081
+    flags = 1
+    data = length 209, hash 75618CF3
+  sample 18:
+    time = 470204
+    flags = 1
+    data = length 209, hash 784C973B
+  sample 19:
+    time = 496326
+    flags = 1
+    data = length 209, hash 49106390
+  sample 20:
+    time = 522448
+    flags = 1
+    data = length 209, hash 70F6A563
+  sample 21:
+    time = 548571
+    flags = 1
+    data = length 209, hash 721882B0
+  sample 22:
+    time = 574693
+    flags = 1
+    data = length 209, hash 81C62AEE
+  sample 23:
+    time = 600816
+    flags = 1
+    data = length 209, hash 16D22463
+  sample 24:
+    time = 626938
+    flags = 1
+    data = length 209, hash 47033534
+  sample 25:
+    time = 653061
+    flags = 1
+    data = length 209, hash CECB37A6
+  sample 26:
+    time = 679183
+    flags = 1
+    data = length 209, hash 6C9C307B
+  sample 27:
+    time = 705306
+    flags = 1
+    data = length 209, hash 3EB1A364
+  sample 28:
+    time = 731428
+    flags = 1
+    data = length 209, hash 30962500
+  sample 29:
+    time = 757551
+    flags = 1
+    data = length 209, hash 2C5CCBB7
+  sample 30:
+    time = 783673
+    flags = 1
+    data = length 209, hash F9CB9E37
+  sample 31:
+    time = 809795
+    flags = 1
+    data = length 209, hash F75BC8C0
+  sample 32:
+    time = 835918
+    flags = 1
+    data = length 209, hash D00ED607
+  sample 33:
+    time = 862040
+    flags = 1
+    data = length 209, hash B4338395
+  sample 34:
+    time = 888163
+    flags = 1
+    data = length 209, hash E3E838A0
+  sample 35:
+    time = 914285
+    flags = 1
+    data = length 209, hash 2B0CF78
+  sample 36:
+    time = 940408
+    flags = 1
+    data = length 209, hash 31906FA9
+  sample 37:
+    time = 966530
+    flags = 1
+    data = length 209, hash C92FC08F
+  sample 38:
+    time = 992653
+    flags = 1
+    data = length 209, hash 7C89994
+  sample 39:
+    time = 1018775
+    flags = 1
+    data = length 209, hash EC37743B
+  sample 40:
+    time = 1044897
+    flags = 1
+    data = length 209, hash C974F6FB
+tracksEnded = true
diff --git a/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.1.dump b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.1.dump
new file mode 100644
index 0000000000..980313e82a
--- /dev/null
+++ b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.1.dump
@@ -0,0 +1,129 @@
+seekMap:
+  isSeekable = true
+  duration = 2115750
+  getPosition(0) = [[timeUs=0, position=227]]
+  getPosition(1) = [[timeUs=0, position=227], [timeUs=26000, position=331]]
+  getPosition(1057875) = [[timeUs=1040000, position=4387], [timeUs=1066000, position=4491]]
+  getPosition(2115750) = [[timeUs=2089750, position=8586]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 5643
+  sample count = 27
+  format 0:
+    averageBitrate = 32000
+    sampleMimeType = audio/mpeg
+    maxInputSize = 4096
+    channelCount = 1
+    sampleRate = 44100
+    encoderDelay = 576
+    encoderPadding = 1404
+    metadata = entries=[TSSE: description=null: values=[Lavf58.45.100]]
+  sample 0:
+    time = 705000
+    flags = 1
+    data = length 209, hash 6CCBBB3B
+  sample 1:
+    time = 731122
+    flags = 1
+    data = length 209, hash 34191E1
+  sample 2:
+    time = 757244
+    flags = 1
+    data = length 209, hash 57323ED7
+  sample 3:
+    time = 783367
+    flags = 1
+    data = length 209, hash 75618CF3
+  sample 4:
+    time = 809489
+    flags = 1
+    data = length 209, hash 784C973B
+  sample 5:
+    time = 835612
+    flags = 1
+    data = length 209, hash 49106390
+  sample 6:
+    time = 861734
+    flags = 1
+    data = length 209, hash 70F6A563
+  sample 7:
+    time = 887857
+    flags = 1
+    data = length 209, hash 721882B0
+  sample 8:
+    time = 913979
+    flags = 1
+    data = length 209, hash 81C62AEE
+  sample 9:
+    time = 940102
+    flags = 1
+    data = length 209, hash 16D22463
+  sample 10:
+    time = 966224
+    flags = 1
+    data = length 209, hash 47033534
+  sample 11:
+    time = 992346
+    flags = 1
+    data = length 209, hash CECB37A6
+  sample 12:
+    time = 1018469
+    flags = 1
+    data = length 209, hash 6C9C307B
+  sample 13:
+    time = 1044591
+    flags = 1
+    data = length 209, hash 3EB1A364
+  sample 14:
+    time = 1070714
+    flags = 1
+    data = length 209, hash 30962500
+  sample 15:
+    time = 1096836
+    flags = 1
+    data = length 209, hash 2C5CCBB7
+  sample 16:
+    time = 1122959
+    flags = 1
+    data = length 209, hash F9CB9E37
+  sample 17:
+    time = 1149081
+    flags = 1
+    data = length 209, hash F75BC8C0
+  sample 18:
+    time = 1175204
+    flags = 1
+    data = length 209, hash D00ED607
+  sample 19:
+    time = 1201326
+    flags = 1
+    data = length 209, hash B4338395
+  sample 20:
+    time = 1227448
+    flags = 1
+    data = length 209, hash E3E838A0
+  sample 21:
+    time = 1253571
+    flags = 1
+    data = length 209, hash 2B0CF78
+  sample 22:
+    time = 1279693
+    flags = 1
+    data = length 209, hash 31906FA9
+  sample 23:
+    time = 1305816
+    flags = 1
+    data = length 209, hash C92FC08F
+  sample 24:
+    time = 1331938
+    flags = 1
+    data = length 209, hash 7C89994
+  sample 25:
+    time = 1358061
+    flags = 1
+    data = length 209, hash EC37743B
+  sample 26:
+    time = 1384183
+    flags = 1
+    data = length 209, hash C974F6FB
+tracksEnded = true
diff --git a/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.2.dump b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.2.dump
new file mode 100644
index 0000000000..27ea66dd9d
--- /dev/null
+++ b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.2.dump
@@ -0,0 +1,73 @@
+seekMap:
+  isSeekable = true
+  duration = 2115750
+  getPosition(0) = [[timeUs=0, position=227]]
+  getPosition(1) = [[timeUs=0, position=227], [timeUs=26000, position=331]]
+  getPosition(1057875) = [[timeUs=1040000, position=4387], [timeUs=1066000, position=4491]]
+  getPosition(2115750) = [[timeUs=2089750, position=8586]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 2717
+  sample count = 13
+  format 0:
+    averageBitrate = 32000
+    sampleMimeType = audio/mpeg
+    maxInputSize = 4096
+    channelCount = 1
+    sampleRate = 44100
+    encoderDelay = 576
+    encoderPadding = 1404
+    metadata = entries=[TSSE: description=null: values=[Lavf58.45.100]]
+  sample 0:
+    time = 1436500
+    flags = 1
+    data = length 209, hash 30962500
+  sample 1:
+    time = 1462622
+    flags = 1
+    data = length 209, hash 2C5CCBB7
+  sample 2:
+    time = 1488744
+    flags = 1
+    data = length 209, hash F9CB9E37
+  sample 3:
+    time = 1514867
+    flags = 1
+    data = length 209, hash F75BC8C0
+  sample 4:
+    time = 1540989
+    flags = 1
+    data = length 209, hash D00ED607
+  sample 5:
+    time = 1567112
+    flags = 1
+    data = length 209, hash B4338395
+  sample 6:
+    time = 1593234
+    flags = 1
+    data = length 209, hash E3E838A0
+  sample 7:
+    time = 1619357
+    flags = 1
+    data = length 209, hash 2B0CF78
+  sample 8:
+    time = 1645479
+    flags = 1
+    data = length 209, hash 31906FA9
+  sample 9:
+    time = 1671602
+    flags = 1
+    data = length 209, hash C92FC08F
+  sample 10:
+    time = 1697724
+    flags = 1
+    data = length 209, hash 7C89994
+  sample 11:
+    time = 1723846
+    flags = 1
+    data = length 209, hash EC37743B
+  sample 12:
+    time = 1749969
+    flags = 1
+    data = length 209, hash C974F6FB
+tracksEnded = true
diff --git a/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.3.dump b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.3.dump
new file mode 100644
index 0000000000..c8ea78c118
--- /dev/null
+++ b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.3.dump
@@ -0,0 +1,21 @@
+seekMap:
+  isSeekable = true
+  duration = 2115750
+  getPosition(0) = [[timeUs=0, position=227]]
+  getPosition(1) = [[timeUs=0, position=227], [timeUs=26000, position=331]]
+  getPosition(1057875) = [[timeUs=1040000, position=4387], [timeUs=1066000, position=4491]]
+  getPosition(2115750) = [[timeUs=2089750, position=8586]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 0
+  sample count = 0
+  format 0:
+    averageBitrate = 32000
+    sampleMimeType = audio/mpeg
+    maxInputSize = 4096
+    channelCount = 1
+    sampleRate = 44100
+    encoderDelay = 576
+    encoderPadding = 1404
+    metadata = entries=[TSSE: description=null: values=[Lavf58.45.100]]
+tracksEnded = true
diff --git a/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.unknown_length.dump b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.unknown_length.dump
new file mode 100644
index 0000000000..67c6563098
--- /dev/null
+++ b/libraries/test_data/src/test/assets/extractordumps/mp3/test-cbr-info-header-pcut-frame.mp3.unknown_length.dump
@@ -0,0 +1,185 @@
+seekMap:
+  isSeekable = true
+  duration = 2115750
+  getPosition(0) = [[timeUs=0, position=227]]
+  getPosition(1) = [[timeUs=0, position=227], [timeUs=26000, position=331]]
+  getPosition(1057875) = [[timeUs=1040000, position=4387], [timeUs=1066000, position=4491]]
+  getPosition(2115750) = [[timeUs=2089750, position=8586]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 8463
+  sample count = 41
+  format 0:
+    averageBitrate = 32000
+    sampleMimeType = audio/mpeg
+    maxInputSize = 4096
+    channelCount = 1
+    sampleRate = 44100
+    encoderDelay = 576
+    encoderPadding = 1404
+    metadata = entries=[TSSE: description=null: values=[Lavf58.45.100]]
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 104, hash BF3B0C83
+  sample 1:
+    time = 26122
+    flags = 1
+    data = length 208, hash 5E56C6DF
+  sample 2:
+    time = 52244
+    flags = 1
+    data = length 209, hash 4FA4483
+  sample 3:
+    time = 78367
+    flags = 1
+    data = length 209, hash E1201788
+  sample 4:
+    time = 104489
+    flags = 1
+    data = length 209, hash FDB8052B
+  sample 5:
+    time = 130612
+    flags = 1
+    data = length 209, hash A8FF2C9
+  sample 6:
+    time = 156734
+    flags = 1
+    data = length 209, hash FD4AE506
+  sample 7:
+    time = 182857
+    flags = 1
+    data = length 209, hash EA0AC2FE
+  sample 8:
+    time = 208979
+    flags = 1
+    data = length 209, hash 84B9DDE0
+  sample 9:
+    time = 235102
+    flags = 1
+    data = length 209, hash 796A4F65
+  sample 10:
+    time = 261224
+    flags = 1
+    data = length 209, hash 4DE92719
+  sample 11:
+    time = 287346
+    flags = 1
+    data = length 209, hash 458A4711
+  sample 12:
+    time = 313469
+    flags = 1
+    data = length 209, hash 27954F2B
+  sample 13:
+    time = 339591
+    flags = 1
+    data = length 209, hash 1A5042B0
+  sample 14:
+    time = 365714
+    flags = 1
+    data = length 209, hash 6CCBBB3B
+  sample 15:
+    time = 391836
+    flags = 1
+    data = length 209, hash 34191E1
+  sample 16:
+    time = 417959
+    flags = 1
+    data = length 209, hash 57323ED7
+  sample 17:
+    time = 444081
+    flags = 1
+    data = length 209, hash 75618CF3
+  sample 18:
+    time = 470204
+    flags = 1
+    data = length 209, hash 784C973B
+  sample 19:
+    time = 496326
+    flags = 1
+    data = length 209, hash 49106390
+  sample 20:
+    time = 522448
+    flags = 1
+    data = length 209, hash 70F6A563
+  sample 21:
+    time = 548571
+    flags = 1
+    data = length 209, hash 721882B0
+  sample 22:
+    time = 574693
+    flags = 1
+    data = length 209, hash 81C62AEE
+  sample 23:
+    time = 600816
+    flags = 1
+    data = length 209, hash 16D22463
+  sample 24:
+    time = 626938
+    flags = 1
+    data = length 209, hash 47033534
+  sample 25:
+    time = 653061
+    flags = 1
+    data = length 209, hash CECB37A6
+  sample 26:
+    time = 679183
+    flags = 1
+    data = length 209, hash 6C9C307B
+  sample 27:
+    time = 705306
+    flags = 1
+    data = length 209, hash 3EB1A364
+  sample 28:
+    time = 731428
+    flags = 1
+    data = length 209, hash 30962500
+  sample 29:
+    time = 757551
+    flags = 1
+    data = length 209, hash 2C5CCBB7
+  sample 30:
+    time = 783673
+    flags = 1
+    data = length 209, hash F9CB9E37
+  sample 31:
+    time = 809795
+    flags = 1
+    data = length 209, hash F75BC8C0
+  sample 32:
+    time = 835918
+    flags = 1
+    data = length 209, hash D00ED607
+  sample 33:
+    time = 862040
+    flags = 1
+    data = length 209, hash B4338395
+  sample 34:
+    time = 888163
+    flags = 1
+    data = length 209, hash E3E838A0
+  sample 35:
+    time = 914285
+    flags = 1
+    data = length 209, hash 2B0CF78
+  sample 36:
+    time = 940408
+    flags = 1
+    data = length 209, hash 31906FA9
+  sample 37:
+    time = 966530
+    flags = 1
+    data = length 209, hash C92FC08F
+  sample 38:
+    time = 992653
+    flags = 1
+    data = length 209, hash 7C89994
+  sample 39:
+    time = 1018775
+    flags = 1
+    data = length 209, hash EC37743B
+  sample 40:
+    time = 1044897
+    flags = 1
+    data = length 209, hash C974F6FB
+tracksEnded = true
diff --git a/libraries/test_data/src/test/assets/media/mp3/test-cbr-info-header-pcut-frame.mp3 b/libraries/test_data/src/test/assets/media/mp3/test-cbr-info-header-pcut-frame.mp3
new file mode 100644
index 0000000000000000000000000000000000000000..2fee1312e0fee0363c4fb0f85b6852779ad7f2dd
GIT binary patch
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