Skip aliases of other codecs

- They are always listed with their canonical names
- Considering aliases means that blacklisting a decoder can end up
  not actually blacklisting it, since it may still be accessible
  via an alias. It also means that our decoder fallback logic can
  end up falling back to a decoder that we've already tried!

PiperOrigin-RevId: 303348297

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecUtil.java

@@ -289,9 +289,16 @@ public final class MediaCodecUtil {
       // Note: MediaCodecList is sorted by the framework such that the best decoders come first.
       for (int i = 0; i < numberOfCodecs; i++) {
         android.media.MediaCodecInfo codecInfo = mediaCodecList.getCodecInfoAt(i);
+        if (isAlias(codecInfo)) {
+          // Skip aliases of other codecs, since they will also be listed under their canonical
+          // names.
+          continue;
+        }
         String name = codecInfo.getName();
-        @Nullable
+        if (!isCodecUsableDecoder(codecInfo, name, secureDecodersExplicit, mimeType)) {
-        String codecMimeType = getCodecMimeType(codecInfo, name, secureDecodersExplicit, mimeType);
+          continue;
+        }
+        @Nullable String codecMimeType = getCodecMimeType(codecInfo, name, mimeType);
         if (codecMimeType == null) {
           continue;
         }
@@ -373,7 +380,6 @@ public final class MediaCodecUtil {
    *
    * @param info The codec information.
    * @param name The name of the codec
-   * @param secureDecodersExplicit Whether secure decoders were explicitly listed, if present.
    * @param mimeType The MIME type.
    * @return The codec's supported MIME type for media of type {@code mimeType}, or {@code null} if
    *     the codec can't be used. If non-null, the returned type will be equal to {@code mimeType}
@@ -383,12 +389,7 @@ public final class MediaCodecUtil {
   private static String getCodecMimeType(
       android.media.MediaCodecInfo info,
       String name,
-      boolean secureDecodersExplicit,
       String mimeType) {
-    if (!isCodecUsableDecoder(info, name, secureDecodersExplicit, mimeType)) {
-      return null;
-    }
-
     String[] supportedTypes = info.getSupportedTypes();
     for (String supportedType : supportedTypes) {
       if (supportedType.equalsIgnoreCase(mimeType)) {
@@ -591,6 +592,15 @@ public final class MediaCodecUtil {
     }
   }
 
+  private static boolean isAlias(android.media.MediaCodecInfo info) {
+    return Util.SDK_INT >= 29 && isAliasV29(info);
+  }
+
+  @RequiresApi(29)
+  private static boolean isAliasV29(android.media.MediaCodecInfo info) {
+    return info.isAlias();
+  }
+
   /**
    * The result of {@link android.media.MediaCodecInfo#isHardwareAccelerated()} for API levels 29+,
    * or a best-effort approximation for lower levels.