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Add regression test of skipping empty track when writing MP4

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The implementation of fragmented MP4 caused a regression where muxer
started writing empty tracks even for non fragmented MP4.

PiperOrigin-RevId: 603091348
This commit is contained in:
sheenachhabra 2024-01-31 10:28:57 -08:00 committed by Copybara-Service
parent cebe6d8ba5
commit cb7ea09af1
2 changed files with 65 additions and 0 deletions
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32
libraries/muxer/src/test/java/androidx/media3/muxer/Mp4MuxerEndToEndTest.java
View File

@ -24,6 +24,7 @@ import android.util.Pair;
import androidx.media3.extractor.mp4.Mp4Extractor;
import androidx.media3.muxer.Mp4Muxer.TrackToken;
import androidx.media3.test.utils.DumpFileAsserts;
import androidx.media3.test.utils.DumpableMp4Box;
import androidx.media3.test.utils.FakeExtractorOutput;
import androidx.media3.test.utils.TestUtil;
import androidx.test.core.app.ApplicationProvider;
@ -156,4 +157,35 @@ public class Mp4MuxerEndToEndTest {
mp4Muxer.close();
}
}
@Test
public void createMp4File_withOneTrackEmpty_doesNotWriteEmptyTrack() throws Exception {
String outputFilePath = temporaryFolder.newFile().getPath();
Mp4Muxer mp4Muxer = new Mp4Muxer.Builder(new FileOutputStream(outputFilePath)).build();
mp4Muxer.setModificationTime(/* timestampMs= */ 500_000_000L);
Pair<ByteBuffer, BufferInfo> track1Sample1 =
MuxerTestUtil.getFakeSampleAndSampleInfo(/* presentationTimeUs= */ 0L);
Pair<ByteBuffer, BufferInfo> track1Sample2 =
MuxerTestUtil.getFakeSampleAndSampleInfo(/* presentationTimeUs= */ 100L);
try {
TrackToken track1 = mp4Muxer.addTrack(/* sortKey= */ 0, FAKE_VIDEO_FORMAT);
mp4Muxer.writeSampleData(track1, track1Sample1.first, track1Sample1.second);
mp4Muxer.writeSampleData(track1, track1Sample2.first, track1Sample2.second);
// Add same track again but without any samples.
mp4Muxer.addTrack(/* sortKey= */ 1, FAKE_VIDEO_FORMAT);
} finally {
mp4Muxer.close();
}
// The FakeExtractorOutput omits tracks with no samples so the dump file will be the same
// with/without the empty track. Hence used DumpableMp4Box instead.
DumpableMp4Box dumpableBox =
new DumpableMp4Box(ByteBuffer.wrap(TestUtil.getByteArrayFromFilePath(outputFilePath)));
// Output contains only one trak box.
DumpFileAsserts.assertOutput(
ApplicationProvider.getApplicationContext(),
dumpableBox,
MuxerTestUtil.getExpectedDumpFilePath("mp4_without_empty_track.mp4"));
}
}

33
libraries/test_data/src/test/assets/muxerdumps/mp4_without_empty_track.mp4.dump Normal file
View File

@ -0,0 +1,33 @@
ftyp (28 bytes):
Data = length 20, hash EF896440
mdat (126 bytes):
Data = length 110, hash 48173D41
moov (674 bytes):
mvhd (108 bytes):
Data = length 100, hash 3D6D026F
trak (558 bytes):
tkhd (92 bytes):
Data = length 84, hash 3EFBEC22
mdia (458 bytes):
mdhd (32 bytes):
Data = length 24, hash 42F40E1C
hdlr (44 bytes):
Data = length 36, hash A0852FF2
minf (374 bytes):
vmhd (20 bytes):
Data = length 12, hash EE830681
dinf (36 bytes):
Data = length 28, hash D535436B
stbl (310 bytes):
stsd (166 bytes):
Data = length 158, hash 11532063
stts (32 bytes):
Data = length 24, hash 4A7D0E0E
stsz (28 bytes):
Data = length 20, hash 3828E071
stsc (28 bytes):
Data = length 20, hash 8F7C9A06
co64 (24 bytes):
Data = length 16, hash E4EE4D2E
stss (24 bytes):
Data = length 16, hash 7940D386