Add Hardware Accelerated VP9 Support

This is Windows 10+ only for now due to a vp9 decoder mft being needed
Fix for older windows is being worked on.

dom/base/nsDOMWindowUtils.cpp

@@ -30,6 +30,9 @@
 #ifdef MOZ_FMP4
 #include "MP4Decoder.h"
 #endif
+#include "WMFDecoderModule.h"
+#include "MediaPrefs.h"
+#include "mozilla/gfx/gfxVars.h"
 #include "CubebUtils.h"
 
 #include "nsIScrollableFrame.h"
@@ -2360,6 +2363,39 @@ nsDOMWindowUtils::GetSupportsHardwareH264Decoding(JS::MutableHandle<JS::Value> a
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDOMWindowUtils::GetSupportsHardwareVP9Decoding(JS::MutableHandle<JS::Value> aPromise)
+{
+  nsCOMPtr<nsPIDOMWindowOuter> window = do_QueryReferent(mWindow);
+  NS_ENSURE_STATE(window);
+  nsCOMPtr<nsIGlobalObject> parentObject =
+    do_QueryInterface(window->GetCurrentInnerWindow());
+  NS_ENSURE_STATE(parentObject);
+
+  ErrorResult rv;
+  RefPtr<Promise> promise = Promise::Create(parentObject, rv);
+  if (rv.Failed()) {
+    return rv.StealNSResult();
+  }
+
+#if defined(XP_WIN) && defined(MOZ_WMF)
+  if (!MediaPrefs::PDMWMFVP9DecoderEnabled()) {
+    promise->MaybeResolve(NS_LITERAL_STRING("No; media.wmf.vp9.enabled is false"));
+  } else if (!gfx::gfxVars::CanUseHardwareVideoDecoding()) {
+    promise->MaybeResolve(NS_LITERAL_STRING("No; hardware video decoding disabled"));
+  } else if (WMFDecoderModule::HasVP9()) {
+    promise->MaybeResolve(NS_LITERAL_STRING("Yes"));
+  } else {
+    promise->MaybeResolve(NS_LITERAL_STRING("No; MFT unavailable"));
+  }
+#else
+  promise->MaybeResolve(NS_LITERAL_STRING("No; not supported on this platform"));
+#endif
+
+  aPromise.setObject(*promise->PromiseObj());
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDOMWindowUtils::GetCurrentAudioBackend(nsAString& aBackend)
 {

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -1419,6 +1419,13 @@ interface nsIDOMWindowUtils : nsISupports {
    * in hardware.
    */
   readonly attribute jsval supportsHardwareH264Decoding;
+  /**
+   * Returns a Promise that will be resolved with a string once the capabilities
+   * of the vp9 decoder have been determined.
+   * Success does not mean that all vp9 video decoding will be done
+   * in hardware.
+   */
+  readonly attribute jsval supportsHardwareVP9Decoding;
 
   /**
    * Returns the current audio backend as a free-form string.

dom/media/platforms/wmf/DXVA2Manager.cpp

@@ -185,6 +185,10 @@ static const GUID DXVA2_Intel_ModeH264_E = {
   0x604F8E68, 0x4951, 0x4c54, { 0x88, 0xFE, 0xAB, 0xD2, 0x5C, 0x15, 0xB3, 0xD6 }
 };
 
+static const GUID DXVA2_ModeVP9_VLD_Profile0 = {
+  0x463707f8, 0xa1d0, 0x4585, { 0x87, 0x6d, 0x83, 0xaa, 0x6d, 0x60, 0xb8, 0x9e }
+};
+
 // This tests if a DXVA video decoder can be created for the given media type/resolution.
 // It uses the same decoder device (DXVA2_ModeH264_E - DXVA2_ModeH264_VLD_NoFGT) as the H264
 // decoder MFT provided by windows (CLSID_CMSH264DecoderMFT) uses, so we can use it to determine
@@ -388,7 +392,8 @@ D3D9DXVA2Manager::Init(layers::KnowsCompositor* aKnowsCompositor,
         decoderDevices[i] == DXVA2_Intel_ModeH264_E) {
       mDecoderGUID = decoderDevices[i];
       found = true;
-      break;
+    } else if (decoderDevices[i] == DXVA2_ModeVP9_VLD_Profile0) {
+      found = true;
     }
   }
   CoTaskMemFree(decoderDevices);
@@ -690,10 +695,13 @@ D3D11DXVA2Manager::Init(layers::KnowsCompositor* aKnowsCompositor,
   for (UINT i = 0; i < profileCount; i++) {
     GUID id;
     hr = videoDevice->GetVideoDecoderProfile(i, &id);
-    if (SUCCEEDED(hr) && (id == DXVA2_ModeH264_E || id == DXVA2_Intel_ModeH264_E)) {
-      mDecoderGUID = id;
-      found = true;
-      break;
+    if (SUCCEEDED(hr)) {
+      if (id == DXVA2_ModeH264_E || id == DXVA2_Intel_ModeH264_E) {
+        mDecoderGUID = id;
+        found = true;
+      } else if (id == DXVA2_ModeVP9_VLD_Profile0) {
+        found = true;
+      }
     }
   }
   if (!found) {

dom/media/platforms/wmf/WMFDecoderModule.cpp

@@ -191,6 +191,12 @@ WMFDecoderModule::HasH264()
   return CanCreateWMFDecoder<CLSID_CMSH264DecoderMFT>();
 }
 
+/* static */ bool
+WMFDecoderModule::HasVP9()
+{
+  return CanCreateWMFDecoder<CLSID_WebmMfVpxDec>();
+}
+
 /* static */ bool
 WMFDecoderModule::HasAAC()
 {

dom/media/platforms/wmf/WMFDecoderModule.h

@@ -43,6 +43,7 @@ public:
   // require a "Media Feature Pack" to be installed.
   static bool HasAAC();
   static bool HasH264();
+  static bool HasVP9();
 
 private:
   bool mWMFInitialized;