Change onOutputFrameAvailable timestamp from nanos to micros.

Upstream timestamps from the decoder are also in microseconds,
so using microseconds here is consistent with that.

PiperOrigin-RevId: 468659099
(cherry picked from commit 0b1c540f)

libraries/common/src/main/java/androidx/media3/common/FrameProcessor.java

@@ -81,11 +81,11 @@ public interface FrameProcessor {
     void onOutputSizeChanged(int width, int height);
 
     /**
-     * Called when an output frame with the given {@code presentationTimeNs} becomes available.
+     * Called when an output frame with the given {@code presentationTimeUs} becomes available.
      *
-     * @param presentationTimeNs The presentation time of the frame, in nanoseconds.
+     * @param presentationTimeUs The presentation time of the frame, in microseconds.
      */
-    void onOutputFrameAvailable(long presentationTimeNs);
+    void onOutputFrameAvailable(long presentationTimeUs);
 
     /**
      * Called when an exception occurs during asynchronous frame processing.

libraries/effect/src/androidTest/java/androidx/media3/effect/GlEffectsFrameProcessorPixelTest.java

@@ -477,7 +477,7 @@ public final class GlEffectsFrameProcessorPixelTest {
                         }
 
                         @Override
-                        public void onOutputFrameAvailable(long presentationTimeNs) {
+                        public void onOutputFrameAvailable(long presentationTimeUs) {
                           // Do nothing as frames are released automatically.
                         }
 

libraries/effect/src/main/java/androidx/media3/effect/FinalMatrixTransformationProcessorWrapper.java

@@ -144,13 +144,13 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   public void queueInputFrame(TextureInfo inputTexture, long presentationTimeUs) {
     long streamOffsetUs =
         checkStateNotNull(streamOffsetUsQueue.peek(), "No input stream specified.");
-    long presentationTimeNs = (presentationTimeUs + streamOffsetUs) * 1000;
-    frameProcessorListener.onOutputFrameAvailable(presentationTimeNs);
+    long offsetPresentationTimeUs = presentationTimeUs + streamOffsetUs;
+    frameProcessorListener.onOutputFrameAvailable(offsetPresentationTimeUs);
     if (releaseFramesAutomatically) {
       renderFrameToSurfaces(
           inputTexture,
           presentationTimeUs,
-          /* releaseTimeNs= */ presentationTimeNs,
+          /* releaseTimeNs= */ offsetPresentationTimeUs * 1000,
           /* dropLateFrame= */ false);
     } else {
       availableFrames.add(Pair.create(inputTexture, presentationTimeUs));

libraries/transformer/src/main/java/androidx/media3/transformer/VideoTranscodingSamplePipeline.java

@@ -126,7 +126,7 @@ import org.checkerframework.dataflow.qual.Pure;
                 }
 
                 @Override
-                public void onOutputFrameAvailable(long presentationTimeNs) {
+                public void onOutputFrameAvailable(long presentationTimeUs) {
                   // Do nothing as frames are released automatically.
                 }