Transformer: Add latest input format to DebugTraceUtil

This can provide more information to help debug muxer errors

PiperOrigin-RevId: 531521974
(cherry picked from commit 2736b118458c1ead0cbac2457700c1333f7c86c7)

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

@@ -17,7 +17,9 @@
 package androidx.media3.effect;
 
 import androidx.annotation.GuardedBy;
+import androidx.annotation.Nullable;
 import androidx.media3.common.C;
+import androidx.media3.common.Format;
 import androidx.media3.common.util.SystemClock;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.common.util.Util;
@@ -68,6 +70,10 @@ public final class DebugTraceUtil {
   @GuardedBy("DebugTraceUtil.class")
   private static final Queue<Long> MUXER_TRACK_END_TIMES_MS = new ArrayDeque<>();
 
+  /** The input {@link Format} of the latest media item. */
+  @GuardedBy("DebugTraceUtil.class")
+  private static @Nullable Format latestVideoInputFormat = null;
+
   /** The number of decoded frames. */
   @GuardedBy("DebugTraceUtil.class")
   private static int numberOfDecodedFrames = 0;
@@ -91,6 +97,7 @@ public final class DebugTraceUtil {
   private DebugTraceUtil() {}
 
   public static synchronized void reset() {
+    latestVideoInputFormat = null;
     numberOfDecodedFrames = 0;
     numberOfFramesRenderedToVideoFrameProcessorInput = 0;
     numberOfFramesRenderedToVideoFrameProcessorOutput = 0;
@@ -105,6 +112,10 @@ public final class DebugTraceUtil {
     MUXER_TRACK_END_TIMES_MS.clear();
   }
 
+  public static synchronized void recordLatestVideoInputFormat(Format format) {
+    latestVideoInputFormat = format;
+  }
+
   public static synchronized void recordDecodedFrame() {
     numberOfDecodedFrames++;
   }
@@ -164,7 +175,9 @@ public final class DebugTraceUtil {
   }
 
   public static synchronized String generateTrace() {
-    return "Decoded: "
+    return "Video input format: "
+        + latestVideoInputFormat
+        + ", Decoded: "
         + numberOfDecodedFrames
         + ", Rendered to VFP: "
         + numberOfFramesRenderedToVideoFrameProcessorInput

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

@@ -71,6 +71,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
   @Override
   protected void onInputFormatRead(Format inputFormat) {
+    DebugTraceUtil.recordLatestVideoInputFormat(inputFormat);
     if (flattenForSlowMotion) {
       sefVideoSlowMotionFlattener = new SefSlowMotionFlattener(inputFormat);
     }