Allow changing output surface in previewing

It covers the following cases:

| From/To     | `null` | `surface 0` | `surface 1` |
|-------------|--------|-------------|-------------|
| `null`      | 🆖      | 📺           | 📺           |
| `surface 0` | ❌      | 🔁           | 📺           |
| `surface 1` | ❌      | 📺           | 🔁           |

Where
- 🆖 means NOP
- ❌ means
  - Set `null` on FrameProcessor, effectively dropping all frames
- 📺 means
  - Notify the listener of video size
  - Set FrameProcessor output surface and size when MSG_SET_VIDEO_OUTPUT_SIZE is received
- 🔁 means
  - Notify the listener of video size

PiperOrigin-RevId: 495477620

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -2588,6 +2588,8 @@ import java.util.concurrent.TimeoutException;
       surfaceSize = new Size(width, height);
       surfaceSize = new Size(width, height);
       listeners.sendEvent(
       listeners.sendEvent(
           EVENT_SURFACE_SIZE_CHANGED, listener -> listener.onSurfaceSizeChanged(width, height));
           EVENT_SURFACE_SIZE_CHANGED, listener -> listener.onSurfaceSizeChanged(width, height));
+      sendRendererMessage(
+          TRACK_TYPE_VIDEO, MSG_SET_VIDEO_OUTPUT_RESOLUTION, new Size(width, height));
     }
     }
   }
   }
 
 
@@ -2945,8 +2947,6 @@ import java.util.concurrent.TimeoutException;
     @Override
     @Override
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
       maybeNotifySurfaceSizeChanged(width, height);
       maybeNotifySurfaceSizeChanged(width, height);
-      sendRendererMessage(
-          TRACK_TYPE_VIDEO, MSG_SET_VIDEO_OUTPUT_RESOLUTION, new Size(width, height));
     }
     }
 
 
     @Override
     @Override

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -695,7 +695,6 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
   }
   }
 
 
   private void setOutput(@Nullable Object output) throws ExoPlaybackException {
   private void setOutput(@Nullable Object output) throws ExoPlaybackException {
-    // TODO(b/238302341) Handle output surface change in previewing.
     // Handle unsupported (i.e., non-Surface) outputs by clearing the display surface.
     // Handle unsupported (i.e., non-Surface) outputs by clearing the display surface.
     @Nullable Surface displaySurface = output instanceof Surface ? (Surface) output : null;
     @Nullable Surface displaySurface = output instanceof Surface ? (Surface) output : null;
 
 
@@ -720,7 +719,9 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
 
 
       @State int state = getState();
       @State int state = getState();
       @Nullable MediaCodecAdapter codec = getCodec();
       @Nullable MediaCodecAdapter codec = getCodec();
-      if (codec != null) {
+      // When FrameProcessorManager is enabled, set FrameProcessorManager's display surface when
+      // surface's resolution is set on receiving MSG_SET_VIDEO_OUTPUT_RESOLUTION.
+      if (codec != null && !frameProcessorManager.isEnabled()) {
         if (Util.SDK_INT >= 23 && displaySurface != null && !codecNeedsSetOutputSurfaceWorkaround) {
         if (Util.SDK_INT >= 23 && displaySurface != null && !codecNeedsSetOutputSurfaceWorkaround) {
           setOutputSurfaceV23(codec, displaySurface);
           setOutputSurfaceV23(codec, displaySurface);
         } else {
         } else {
@@ -734,12 +735,16 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
         // We haven't rendered to the new display surface yet.
         // We haven't rendered to the new display surface yet.
         clearRenderedFirstFrame();
         clearRenderedFirstFrame();
         if (state == STATE_STARTED) {
         if (state == STATE_STARTED) {
+          // Set joining deadline to report MediaCodecVideoRenderer is ready.
           setJoiningDeadlineMs();
           setJoiningDeadlineMs();
         }
         }
       } else {
       } else {
         // The display surface has been removed.
         // The display surface has been removed.
         clearReportedVideoSize();
         clearReportedVideoSize();
         clearRenderedFirstFrame();
         clearRenderedFirstFrame();
+        if (frameProcessorManager.isEnabled()) {
+          frameProcessorManager.clearOutputSurfaceInfo();
+        }
       }
       }
     } else if (displaySurface != null && displaySurface != placeholderSurface) {
     } else if (displaySurface != null && displaySurface != placeholderSurface) {
       // The display surface is set and unchanged. If we know the video size and/or have already
       // The display surface is set and unchanged. If we know the video size and/or have already
@@ -1807,6 +1812,8 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
      */
      */
     private @MonotonicNonNull Pair<Long, Format> currentFrameFormat;
     private @MonotonicNonNull Pair<Long, Format> currentFrameFormat;
 
 
+    @Nullable private Pair<Surface, Size> currentSurfaceAndSize;
+
     private int frameProcessorMaxPendingFrameCount;
     private int frameProcessorMaxPendingFrameCount;
     private boolean canEnableFrameProcessing;
     private boolean canEnableFrameProcessing;
 
 
@@ -1957,13 +1964,29 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
      * @param outputResolution The {@link Size} of the output resolution.
      * @param outputResolution The {@link Size} of the output resolution.
      */
      */
     public void setOutputSurfaceInfo(Surface outputSurface, Size outputResolution) {
     public void setOutputSurfaceInfo(Surface outputSurface, Size outputResolution) {
+      if (currentSurfaceAndSize != null
+          && currentSurfaceAndSize.first.equals(outputSurface)
+          && currentSurfaceAndSize.second.equals(outputResolution)) {
+        return;
+      }
       checkNotNull(frameProcessor)
       checkNotNull(frameProcessor)
           .setOutputSurfaceInfo(
           .setOutputSurfaceInfo(
               new SurfaceInfo(
               new SurfaceInfo(
                   outputSurface, outputResolution.getWidth(), outputResolution.getHeight()));
                   outputSurface, outputResolution.getWidth(), outputResolution.getHeight()));
+      currentSurfaceAndSize = Pair.create(outputSurface, outputResolution);
     }
     }
 
 
     /**
     /**
+     * Clears the set output surface info.
+     *
+     * <p>Caller must ensure the {@code FrameProcessorManager} {@link #isEnabled()} before calling
+     * this method.
+     */
+    public void clearOutputSurfaceInfo() {
+      checkNotNull(frameProcessor).setOutputSurfaceInfo(null);
+      currentSurfaceAndSize = null;
+    }
+    /**
      * Sets the input surface info.
      * Sets the input surface info.
      *
      *
      * <p>Caller must ensure the {@code FrameProcessorManager} {@link #isEnabled()} before calling
      * <p>Caller must ensure the {@code FrameProcessorManager} {@link #isEnabled()} before calling