Fix DV Profile 7 fallback to HEVC to preserve HDR10+ metadata

On devices that don't support Dolby Vision output, Profile 7 (DvheDtb)
remux files fell back to plain HDR10 because the HEVC base-layer
fallback path was blocked and HDR10+ metadata was never forwarded to
HEVC decoders.

- Allow DolbyVisionProfileDvheDtb to fall back to HEVC in
  getAlternativeCodecMimeType, since its base layer is always
  backward-compatible HEVC Main 10.
- Extend isHdr10PlusOutOfBandMetadataSupported to recognize HEVC
  decoders advertising HEVCProfileMain10HDR10Plus (API 33+), so
  dynamic HDR10+ metadata is forwarded via PARAMETER_KEY_HDR10_PLUS_INFO.

Author: guyyagil

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/mediacodec/MediaCodecInfo.java

@@ -410,10 +410,19 @@ private boolean isCompressedAudioBitDepthSupported(Format format) {
 
   /** Whether the codec handles HDR10+ out-of-band metadata. */
   public boolean isHdr10PlusOutOfBandMetadataSupported() {
-    if (SDK_INT >= 29 && MimeTypes.VIDEO_VP9.equals(mimeType)) {
-      for (CodecProfileLevel capabilities : getProfileLevels()) {
-        if (capabilities.profile == CodecProfileLevel.VP9Profile2HDR10Plus) {
-          return true;
+    if (SDK_INT >= 29) {
+      if (MimeTypes.VIDEO_VP9.equals(mimeType)) {
+        for (CodecProfileLevel capabilities : getProfileLevels()) {
+          if (capabilities.profile == CodecProfileLevel.VP9Profile2HDR10Plus) {
+            return true;
+          }
+        }
+      }
+      if (SDK_INT >= 33 && MimeTypes.VIDEO_H265.equals(mimeType)) {
+        for (CodecProfileLevel capabilities : getProfileLevels()) {
+          if (capabilities.profile == CodecProfileLevel.HEVCProfileMain10HDR10Plus) {
+            return true;
+          }
         }
       }
     }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/mediacodec/MediaCodecUtil.java

@@ -382,16 +382,17 @@ public static String getAlternativeCodecMimeType(Format format) {
     }
     if (MimeTypes.VIDEO_DOLBY_VISION.equals(format.sampleMimeType)) {
       // H.264/AVC, H.265/HEVC or AV1 decoders can decode the base layer of some DV profiles.
-      // This can't be done for profile CodecProfileLevel.DolbyVisionProfileDvheStn and profile
-      // CodecProfileLevel.DolbyVisionProfileDvheDtb because the first one is not backward
-      // compatible and the second one is deprecated and is not always backward compatible.
+      // This can't be done for profile CodecProfileLevel.DolbyVisionProfileDvheStn because it is
+      // not backward compatible. Profile DolbyVisionProfileDvheDtb (profile 7) is deprecated but
+      // its base layer is always backward-compatible HEVC Main 10, so HEVC fallback is safe.
       @Nullable
       MediaCodecProfileAndLevel codecProfileAndLevel =
           CodecSpecificDataUtil.getMediaCodecProfileAndLevel(format);
       if (codecProfileAndLevel != null && codecProfileAndLevel.isSupportableByMediaCodec()) {
         int profile = codecProfileAndLevel.getProfile();
         if (profile == CodecProfileLevel.DolbyVisionProfileDvheDtr
-            || profile == CodecProfileLevel.DolbyVisionProfileDvheSt) {
+            || profile == CodecProfileLevel.DolbyVisionProfileDvheSt
+            || profile == CodecProfileLevel.DolbyVisionProfileDvheDtb) {
           return MimeTypes.VIDEO_H265;
         } else if (profile == CodecProfileLevel.DolbyVisionProfileDvavSe) {
           return MimeTypes.VIDEO_H264;

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/video/MediaCodecVideoRendererTest.java

@@ -4445,6 +4445,11 @@ public void supportsFormat_withDolbyVisionMedia_returnsTrueWhenFallbackToAv1H265
             .setSampleMimeType(MimeTypes.VIDEO_DOLBY_VISION)
             .setCodecs("dvhe.04.01")
             .build();
+    Format formatDvheDtbFallbackToH265 =
+        new Format.Builder()
+            .setSampleMimeType(MimeTypes.VIDEO_DOLBY_VISION)
+            .setCodecs("dvhe.07.01")
+            .build();
     Format formatDvheStFallbackToH265 =
         new Format.Builder()
             .setSampleMimeType(MimeTypes.VIDEO_DOLBY_VISION)
@@ -4556,6 +4561,8 @@ public void supportsFormat_withDolbyVisionMedia_returnsTrueWhenFallbackToAv1H265
     @Capabilities
     int capabilitiesDvheDtrFallbackToH265 = renderer.supportsFormat(formatDvheDtrFallbackToH265);
     @Capabilities
+    int capabilitiesDvheDtbFallbackToH265 = renderer.supportsFormat(formatDvheDtbFallbackToH265);
+    @Capabilities
     int capabilitiesDvheStFallbackToH265 = renderer.supportsFormat(formatDvheStFallbackToH265);
     @Capabilities
     int capabilitiesDvavSeFallbackToH264 = renderer.supportsFormat(formatDvavSeFallbackToH264);
@@ -4568,6 +4575,8 @@ public void supportsFormat_withDolbyVisionMedia_returnsTrueWhenFallbackToAv1H265
 
     assertThat(RendererCapabilities.getFormatSupport(capabilitiesDvheDtrFallbackToH265))
         .isEqualTo(C.FORMAT_HANDLED);
+    assertThat(RendererCapabilities.getFormatSupport(capabilitiesDvheDtbFallbackToH265))
+        .isEqualTo(C.FORMAT_HANDLED);
     assertThat(RendererCapabilities.getFormatSupport(capabilitiesDvheStFallbackToH265))
         .isEqualTo(C.FORMAT_HANDLED);
     assertThat(RendererCapabilities.getFormatSupport(capabilitiesDvavSeFallbackToH264))