Issue #1820 - Part 8: Check bit depth in PDM::Supports.

dom/media/platforms/PlatformDecoderModule.h

@@ -129,9 +129,11 @@ public:
   virtual bool Supports(const TrackInfo& aTrackInfo,
                         DecoderDoctorDiagnostics* aDiagnostics) const
   {
-    // By default, fall back to SupportsMimeType with just the MIME string.
-    // (So PDMs do not need to override this method -- yet.)
-    return SupportsMimeType(aTrackInfo.mMimeType, aDiagnostics);
+    if (!SupportsMimeType(aTrackInfo.mMimeType, aDiagnostics)) {
+      return false;
+    }
+    const auto videoInfo = aTrackInfo.GetAsVideoInfo();
+    return !videoInfo || SupportsBitDepth(videoInfo->mBitDepth, aDiagnostics);
   }
 
   enum class ConversionRequired : uint8_t {
@@ -153,6 +155,15 @@ protected:
   friend class PDMFactory;
   friend class dom::RemoteDecoderModule;
 
+  // Indicates if the PlatformDecoderModule supports decoding of aBitDepth.
+  // Should override this method when the platform can support bitDepth != 8.
+  virtual bool SupportsBitDepth(const uint8_t aBitDepth,
+                                DecoderDoctorDiagnostics* aDiagnostics) const
+  {
+    return aBitDepth == 8;
+  }
+
+
   // Creates a Video decoder. The layers backend is passed in so that
   // decoders can determine whether hardware accelerated decoding can be used.
   // Asynchronous decoding of video should be done in runnables dispatched

dom/media/platforms/ffmpeg/FFmpegDecoderModule.h

@@ -77,6 +77,21 @@ public:
     }
   }
 
+protected:
+  bool SupportsBitDepth(const uint8_t aBitDepth,
+                        DecoderDoctorDiagnostics* aDiagnostics) const override
+  {
+    // We don't support bitDepth > 8 when compositor backend is D3D11.
+    // But we don't have KnowsCompositor or any object
+    // that we can ask for the layersbackend type.
+    // We should remove this restriction until
+    // we solve the D3D11 compositor backend issue.
+#if defined(XP_LINUX) || defined(XP_MACOSX)
+    return true;
+#endif
+    return aBitDepth == 8;
+  }
+
 private:
   FFmpegLibWrapper* mLib;
 };

dom/media/platforms/wmf/WMFDecoderModule.cpp

@@ -205,6 +205,14 @@ bool
 WMFDecoderModule::Supports(const TrackInfo& aTrackInfo,
                            DecoderDoctorDiagnostics* aDiagnostics) const
 {
+  // Check bit depth of video.
+  // XXXMC: This is here in case we want to start accepting HDR video. Do we?
+  //        This currently defaults to a fail if video bitdepth != 8
+  const auto videoInfo = aTrackInfo.GetAsVideoInfo();
+  if (videoInfo && !SupportsBitDepth(videoInfo->mBitDepth, aDiagnostics)) {
+    return false;
+  }
+
   if ((aTrackInfo.mMimeType.EqualsLiteral("audio/mp4a-latm") ||
        aTrackInfo.mMimeType.EqualsLiteral("audio/mp4")) &&
        WMFDecoderModule::HasAAC()) {
@@ -221,7 +229,7 @@ WMFDecoderModule::Supports(const TrackInfo& aTrackInfo,
         return false;
       }
     } else {
-      // Windows <=7 supports at most 1920x1088.
+      // Windows 7 supports at most 1920x1088.
       if (videoInfo->mImage.width > 1920 || videoInfo->mImage.height > 1088) {
         return false;
       }