Add util method to extract renderer capabilities.

This instantiates the renderers and extract the capabilities. None of the known
renderes incurs any overhead during instantiation.

PiperOrigin-RevId: 224118511

library/core/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -48,8 +48,15 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.ParserException;
+import com.google.android.exoplayer2.Renderer;
+import com.google.android.exoplayer2.RendererCapabilities;
+import com.google.android.exoplayer2.RenderersFactory;
 import com.google.android.exoplayer2.SeekParameters;
+import com.google.android.exoplayer2.audio.AudioRendererEventListener;
+import com.google.android.exoplayer2.drm.DrmSessionManager;
+import com.google.android.exoplayer2.drm.FrameworkMediaCrypto;
 import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.video.VideoRendererEventListener;
 import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.File;
@@ -1842,6 +1849,32 @@ public final class Util {
     return displaySize;
   }
 
+  /**
+   * Extract renderer capabilities for the renderers created by the provided renderers factory.
+   *
+   * @param renderersFactory A {@link RenderersFactory}.
+   * @param drmSessionManager An optional {@link DrmSessionManager} used by the renderers.
+   * @return The {@link RendererCapabilities} for each renderer created by the {@code
+   *     renderersFactory}.
+   */
+  public static RendererCapabilities[] getRendererCapabilities(
+      RenderersFactory renderersFactory,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) {
+    Renderer[] renderers =
+        renderersFactory.createRenderers(
+            new Handler(),
+            new VideoRendererEventListener() {},
+            new AudioRendererEventListener() {},
+            (cues) -> {},
+            (metadata) -> {},
+            drmSessionManager);
+    RendererCapabilities[] capabilities = new RendererCapabilities[renderers.length];
+    for (int i = 0; i < renderers.length; i++) {
+      capabilities[i] = renderers[i].getCapabilities();
+    }
+    return capabilities;
+  }
+
   @Nullable
   private static String getSystemProperty(String name) {
     try {