From c5c171beba8f2aaa5ef26b47eb817dfba141996f Mon Sep 17 00:00:00 2001
From: kimvde <kimvde@google.com>
Date: Thu, 23 Feb 2023 14:00:56 +0000
Subject: [PATCH] Add unit tests for audio track dis(appearing) during export

PiperOrigin-RevId: 511764841
---
 .../transformer/TransformerEndToEndTest.java  |  77 +-
 ...atenated_with_high_pitch_and_no_video.dump | 204 ++++
 ...mple.mp4.silence_skipped_concatenated.dump | 546 -----------
 .../mp4/sample.mp4.silence_then_audio.dump    | 917 ++++++++++++++++++
 ...e.mp4.silence_then_audio_with_effects.dump | 755 ++++++++++++++
 5 files changed, 1941 insertions(+), 558 deletions(-)
 create mode 100644 testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump
 delete mode 100644 testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_skipped_concatenated.dump
 create mode 100644 testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio.dump
 create mode 100644 testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump

diff --git a/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerEndToEndTest.java b/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerEndToEndTest.java
index b96f70c95c..93d2bbaa43 100644
--- a/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerEndToEndTest.java
+++ b/library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerEndToEndTest.java
@@ -47,7 +47,6 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.audio.AudioProcessor;
-import com.google.android.exoplayer2.audio.SilenceSkippingAudioProcessor;
 import com.google.android.exoplayer2.audio.SonicAudioProcessor;
 import com.google.android.exoplayer2.effect.Presentation;
 import com.google.android.exoplayer2.effect.ScaleAndRotateTransformation;
@@ -397,8 +396,7 @@ public final class TransformerEndToEndTest {
   public void start_concatenateMediaItemsWithSameFormat_completesSuccessfully() throws Exception {
     Transformer transformer = createTransformerBuilder(/* enableFallback= */ false).build();
     MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
-    EditedMediaItem editedMediaItem =
-        new EditedMediaItem.Builder(mediaItem).setEffects(Effects.EMPTY).build();
+    EditedMediaItem editedMediaItem = new EditedMediaItem.Builder(mediaItem).build();
     EditedMediaItemSequence editedMediaItemSequence =
         new EditedMediaItemSequence(ImmutableList.of(editedMediaItem, editedMediaItem));
     Composition composition =
@@ -419,14 +417,15 @@ public final class TransformerEndToEndTest {
       throws Exception {
     Transformer transformer = createTransformerBuilder(/* enableFallback= */ false).build();
     MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
-    AudioProcessor audioProcessor = new SilenceSkippingAudioProcessor();
+    SonicAudioProcessor sonicAudioProcessor = new SonicAudioProcessor();
+    sonicAudioProcessor.setPitch(2f);
     Effects effects =
-        new Effects(ImmutableList.of(audioProcessor), /* videoEffects= */ ImmutableList.of());
+        new Effects(ImmutableList.of(sonicAudioProcessor), /* videoEffects= */ ImmutableList.of());
     // The video track must be removed in order for the export to end. Indeed, the
     // Robolectric decoder just copies the input buffers to the output and the audio timestamps are
-    // therefore computed based on the encoded samples. As a result, the audio timestamps are much
-    // smaller than they should be and the muxer waits for more audio samples before writing video
-    // samples.
+    // therefore computed based on the encoded samples (see [internal: b/178685617]). As a result,
+    // the audio timestamps are much smaller than they should be and the muxer waits for more audio
+    // samples before writing video samples.
     EditedMediaItem editedMediaItem =
         new EditedMediaItem.Builder(mediaItem).setEffects(effects).setRemoveVideo(true).build();
     EditedMediaItemSequence editedMediaItemSequence =
@@ -438,7 +437,58 @@ public final class TransformerEndToEndTest {
     TransformerTestRunner.runLooper(transformer);
 
     DumpFileAsserts.assertOutput(
-        context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO + ".silence_skipped_concatenated"));
+        context,
+        testMuxer,
+        getDumpFileName(FILE_AUDIO_VIDEO + ".concatenated_with_high_pitch_and_no_video"));
+  }
+
+  @Test
+  public void start_concatenateSilenceAndAudio_completesSuccessfully() throws Exception {
+    Transformer transformer = createTransformerBuilder(/* enableFallback= */ false).build();
+    MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
+    EditedMediaItem noAudioEditedMediaItem =
+        new EditedMediaItem.Builder(mediaItem).setRemoveAudio(true).build();
+    EditedMediaItem audioEditedMediaItem = new EditedMediaItem.Builder(mediaItem).build();
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence(ImmutableList.of(noAudioEditedMediaItem, audioEditedMediaItem));
+    Composition composition =
+        new Composition.Builder(ImmutableList.of(sequence))
+            .experimentalSetForceAudioTrack(true)
+            .setTransmuxVideo(true)
+            .build();
+
+    transformer.start(composition, outputPath);
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO + ".silence_then_audio"));
+  }
+
+  @Test
+  public void start_concatenateSilenceAndAudioWithEffects_completesSuccessfully() throws Exception {
+    Transformer transformer = createTransformerBuilder(/* enableFallback= */ false).build();
+    MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
+    SonicAudioProcessor sonicAudioProcessor = new SonicAudioProcessor();
+    sonicAudioProcessor.setPitch(2f);
+    Effects effects =
+        new Effects(ImmutableList.of(sonicAudioProcessor), /* videoEffects= */ ImmutableList.of());
+    EditedMediaItem noAudioEditedMediaItem =
+        new EditedMediaItem.Builder(mediaItem).setRemoveAudio(true).setEffects(effects).build();
+    EditedMediaItem audioEditedMediaItem =
+        new EditedMediaItem.Builder(mediaItem).setEffects(effects).build();
+    EditedMediaItemSequence sequence =
+        new EditedMediaItemSequence(ImmutableList.of(noAudioEditedMediaItem, audioEditedMediaItem));
+    Composition composition =
+        new Composition.Builder(ImmutableList.of(sequence))
+            .experimentalSetForceAudioTrack(true)
+            .setTransmuxVideo(true)
+            .build();
+
+    transformer.start(composition, outputPath);
+    TransformerTestRunner.runLooper(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO + ".silence_then_audio_with_effects"));
   }
 
   @Test
@@ -469,9 +519,10 @@ public final class TransformerEndToEndTest {
   public void start_multipleMediaItemsWithEffectsAndTransmux_ignoresTransmux() throws Exception {
     Transformer transformer = createTransformerBuilder(/* enableFallback= */ false).build();
     MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
-    AudioProcessor audioProcessor = new SilenceSkippingAudioProcessor();
+    SonicAudioProcessor sonicAudioProcessor = new SonicAudioProcessor();
+    sonicAudioProcessor.setPitch(2f);
     Effects effects =
-        new Effects(ImmutableList.of(audioProcessor), /* videoEffects= */ ImmutableList.of());
+        new Effects(ImmutableList.of(sonicAudioProcessor), /* videoEffects= */ ImmutableList.of());
     EditedMediaItem editedMediaItem =
         new EditedMediaItem.Builder(mediaItem).setEffects(effects).setRemoveVideo(true).build();
     EditedMediaItemSequence editedMediaItemSequence =
@@ -489,7 +540,9 @@ public final class TransformerEndToEndTest {
     // audio effects have been added to the first MediaItem in the sequence, so the transcoding
     // audio sample pipeline should be picked to apply these effects.
     DumpFileAsserts.assertOutput(
-        context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO + ".silence_skipped_concatenated"));
+        context,
+        testMuxer,
+        getDumpFileName(FILE_AUDIO_VIDEO + ".concatenated_with_high_pitch_and_no_video"));
   }
 
   @Test
diff --git a/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump
new file mode 100644
index 0000000000..56ee4a8494
--- /dev/null
+++ b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump
@@ -0,0 +1,204 @@
+format 0:
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+sample:
+  trackIndex = 0
+  dataHashCode = 915609509
+  size = 792
+  isKeyFrame = true
+  presentationTimeUs = 0
+sample:
+  trackIndex = 0
+  dataHashCode = -1580893866
+  size = 678
+  isKeyFrame = true
+  presentationTimeUs = 8980
+sample:
+  trackIndex = 0
+  dataHashCode = -31547651
+  size = 304
+  isKeyFrame = true
+  presentationTimeUs = 16667
+sample:
+  trackIndex = 0
+  dataHashCode = 1415140636
+  size = 460
+  isKeyFrame = true
+  presentationTimeUs = 20114
+sample:
+  trackIndex = 0
+  dataHashCode = 1721060815
+  size = 850
+  isKeyFrame = true
+  presentationTimeUs = 25329
+sample:
+  trackIndex = 0
+  dataHashCode = 1707913464
+  size = 446
+  isKeyFrame = true
+  presentationTimeUs = 34966
+sample:
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+  dataHashCode = -776771764
+  size = 852
+  isKeyFrame = true
+  presentationTimeUs = 40023
+sample:
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+  size = 368
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+  presentationTimeUs = 49683
+sample:
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+  size = 1166
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+released = true
diff --git a/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_skipped_concatenated.dump b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_skipped_concatenated.dump
deleted file mode 100644
index 89b1001002..0000000000
--- a/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_skipped_concatenated.dump
+++ /dev/null
@@ -1,546 +0,0 @@
-format 0:
-  sampleMimeType = audio/mp4a-latm
-  channelCount = 1
-  sampleRate = 44100
-  pcmEncoding = 2
-sample:
-  trackIndex = 0
-  dataHashCode = 1205768497
-  size = 23
-  isKeyFrame = true
-  presentationTimeUs = 0
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diff --git a/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio.dump b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio.dump
new file mode 100644
index 0000000000..cc3ece82c8
--- /dev/null
+++ b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio.dump
@@ -0,0 +1,917 @@
+format 0:
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+  codecs = avc1.64001F
+  maxInputSize = 36722
+  width = 1080
+  height = 720
+  frameRate = 29.970028
+  initializationData:
+    data = length 29, hash 4746B5D9
+    data = length 10, hash 7A0D0F2B
+format 1:
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+  sampleRate = 44100
+  pcmEncoding = 2
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diff --git a/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump
new file mode 100644
index 0000000000..4bc80a7687
--- /dev/null
+++ b/testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump
@@ -0,0 +1,755 @@
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