Transmux video if rotation is only effect applied

PiperOrigin-RevId: 535554628
(cherry picked from commit 8ba6b12ebc28a5fefe5f0b1d9a565794ebaf9ea6)

library/effect/src/main/java/com/google/android/exoplayer2/effect/ScaleAndRotateTransformation.java

@@ -90,17 +90,20 @@ public final class ScaleAndRotateTransformation implements MatrixTransformation
     }
   }
 
+  /** The multiplier by which the frame will scale horizontally, along the x-axis. */
+  public final float scaleX;
+  /** The multiplier by which the frame will scale vertically, along the y-axis. */
+  public final float scaleY;
+  /** The counterclockwise rotation, in degrees. */
+  public final float rotationDegrees;
+
   private final Matrix transformationMatrix;
   private @MonotonicNonNull Matrix adjustedTransformationMatrix;
 
-  /**
-   * Creates a new instance.
-   *
-   * @param scaleX The multiplier by which the frame will scale horizontally, along the x-axis.
-   * @param scaleY The multiplier by which the frame will scale vertically, along the y-axis.
-   * @param rotationDegrees How much to rotate the frame counterclockwise, in degrees.
-   */
   private ScaleAndRotateTransformation(float scaleX, float scaleY, float rotationDegrees) {
+    this.scaleX = scaleX;
+    this.scaleY = scaleY;
+    this.rotationDegrees = rotationDegrees;
     transformationMatrix = new Matrix();
     transformationMatrix.postScale(scaleX, scaleY);
     transformationMatrix.postRotate(rotationDegrees);

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/MuxerWrapper.java

@@ -83,6 +83,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   private boolean isAborted;
   private @MonotonicNonNull Muxer muxer;
 
+  private volatile int additionalRotationDegrees;
   private volatile int trackCount;
 
   public MuxerWrapper(String outputPath, Muxer.Factory muxerFactory, Listener listener) {
@@ -96,6 +97,25 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   }
 
   /**
+   * Sets the clockwise rotation to add to the {@linkplain #addTrackFormat(Format) video track's}
+   * rotation, in degrees.
+   *
+   * <p>This value must be set before any track format is {@linkplain #addTrackFormat(Format)
+   * added}.
+   *
+   * <p>Can be called from any thread.
+   *
+   * @throws IllegalStateException If a track format was {@linkplain #addTrackFormat(Format) added}
+   *     before calling this method.
+   */
+  public void setAdditionalRotationDegrees(int additionalRotationDegrees) {
+    checkState(
+        trackTypeToInfo.size() == 0,
+        "The additional rotation cannot be changed after adding track formats.");
+    this.additionalRotationDegrees = additionalRotationDegrees;
+  }
+
+  /**
    * Sets the number of output tracks.
    *
    * <p>The track count must be set before any track format is {@linkplain #addTrackFormat(Format)
@@ -160,6 +180,13 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
     ensureMuxerInitialized();
 
+    if (trackType == C.TRACK_TYPE_VIDEO) {
+      format =
+          format
+              .buildUpon()
+              .setRotationDegrees((format.rotationDegrees + additionalRotationDegrees) % 360)
+              .build();
+    }
     TrackInfo trackInfo = new TrackInfo(format, muxer.addTrack(format));
     trackTypeToInfo.put(trackType, trackInfo);
 

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerInternal.java

@@ -41,6 +41,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.effect.Presentation;
+import com.google.android.exoplayer2.effect.ScaleAndRotateTransformation;
 import com.google.android.exoplayer2.util.Clock;
 import com.google.android.exoplayer2.util.ConditionVariable;
 import com.google.android.exoplayer2.util.DebugViewProvider;
@@ -710,7 +711,31 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
         if (inputFormat.pixelWidthHeightRatio != 1f) {
           return true;
         }
-        if (!areVideoEffectsAllNoOp(firstEditedMediaItem.effects.videoEffects, inputFormat)) {
+        ImmutableList<Effect> videoEffects = firstEditedMediaItem.effects.videoEffects;
+        return !videoEffects.isEmpty()
+            && !areVideoEffectsAllNoOp(videoEffects, inputFormat)
+            && !hasOnlyRegularRotationEffect(videoEffects);
+      }
+
+      private boolean hasOnlyRegularRotationEffect(ImmutableList<Effect> videoEffects) {
+        if (videoEffects.size() != 1) {
+          return false;
+        }
+        Effect videoEffect = videoEffects.get(0);
+        if (!(videoEffect instanceof ScaleAndRotateTransformation)) {
+          return false;
+        }
+        ScaleAndRotateTransformation scaleAndRotateTransformation =
+            (ScaleAndRotateTransformation) videoEffect;
+        if (scaleAndRotateTransformation.scaleX != 1f
+            || scaleAndRotateTransformation.scaleY != 1f) {
+          return false;
+        }
+        float rotationDegrees = scaleAndRotateTransformation.rotationDegrees;
+        if (rotationDegrees == 90f || rotationDegrees == 180f || rotationDegrees == 270f) {
+          // The MuxerWrapper rotation is clockwise while the ScaleAndRotateTransformation rotation
+          // is counterclockwise.
+          muxerWrapper.setAdditionalRotationDegrees(360 - Math.round(rotationDegrees));
           return true;
         }
         return false;

library/transformer/src/test/java/com/google/android/exoplayer2/transformer/MediaItemExportTest.java

@@ -976,6 +976,28 @@ public final class MediaItemExportTest {
   }
 
   @Test
+  public void start_withOnlyRegularRotationEffect_transmuxesAndRotates() throws Exception {
+    Transformer transformer =
+        createTransformerBuilder(testMuxerHolder, /* enableFallback= */ false).build();
+    MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
+    ImmutableList<Effect> videoEffects =
+        ImmutableList.of(
+            new ScaleAndRotateTransformation.Builder().setRotationDegrees(270).build());
+    Effects effects = new Effects(/* audioProcessors= */ ImmutableList.of(), videoEffects);
+    EditedMediaItem editedMediaItem =
+        new EditedMediaItem.Builder(mediaItem).setEffects(effects).build();
+
+    transformer.start(editedMediaItem, outputPath);
+    TransformerTestRunner.runLooper(transformer);
+
+    // Video transcoding in unit tests is not supported.
+    DumpFileAsserts.assertOutput(
+        context,
+        checkNotNull(testMuxerHolder.testMuxer),
+        getDumpFileName(FILE_AUDIO_VIDEO + ".rotated"));
+  }
+
+  @Test
   public void getProgress_knownDuration_returnsConsistentStates() throws Exception {
     Transformer transformer =
         createTransformerBuilder(testMuxerHolder, /* enableFallback= */ false).build();

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.rotated.dump

+format 0:
+  id = 1
+  sampleMimeType = video/avc
+  codecs = avc1.64001F
+  maxInputSize = 36722
+  width = 1080
+  height = 720
+  frameRate = 29.970028
+  rotationDegrees = 90
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
+  initializationData:
+    data = length 29, hash 4746B5D9
+    data = length 10, hash 7A0D0F2B
+container metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
+format 1:
+  peakBitrate = 200000
+  id = 2
+  sampleMimeType = audio/mp4a-latm
+  codecs = mp4a.40.2
+  maxInputSize = 294
+  channelCount = 1
+  sampleRate = 44100
+  language = und
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
+  initializationData:
+    data = length 2, hash 5F7
+container metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
+sample:
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+  dataHashCode = 1205768497
+  size = 23
+  isKeyFrame = true
+  presentationTimeUs = 44000
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+  size = 6
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