Bug 1245789 - Use ifdef MOZ_WIDEVINE_EME to prevent compilation when not enabled. r=gerald,a=ritu

This means we won't try to build it when ac_add_options --enable-eme=widevine is
not present, and critically, we won't try to build it on Android, since the Chromium
Widevine plugin isn't available there.

MozReview-Commit-ID: 1jQvAbJP8HG

browser/app/profile/firefox.js

@@ -1356,11 +1356,18 @@ pref("media.gmp.decoder.h264", 2);
 // decode H.264.
 pref("media.gmp.trial-create.enabled", true);
 
-#ifdef MOZ_ADOBE_EME
+#if defined(MOZ_ADOBE_EME) || defined(MOZ_WIDEVINE_EME)
 pref("browser.eme.ui.enabled", true);
+#endif
+
+#ifdef MOZ_ADOBE_EME
 pref("media.gmp-eme-adobe.enabled", true);
 #endif
 
+#ifdef MOZ_WIDEVINE_EME
+pref("media.gmp-widevinecdm.enabled", true);
+#endif
+
 // Play with different values of the decay time and get telemetry,
 // 0 means to randomize (and persist) the experiment value in users' profiles,
 // -1 means no experiment is run and we use the preferred value for frecency (6h)

dom/media/eme/MediaKeySystemAccess.cpp

@@ -306,9 +306,22 @@ MediaKeySystemAccess::GetKeySystemStatus(const nsAString& aKeySystem,
   }
 #endif
 
+#ifdef MOZ_WIDEVINE_EME
   if (aKeySystem.EqualsLiteral("com.widevine.alpha")) {
+#ifdef XP_WIN
+    // Win Vista and later only.
+    if (!IsVistaOrLater()) {
+      aOutMessage = NS_LITERAL_CSTRING("Minimum Windows version not met for Widevine EME");
+      return MediaKeySystemStatus::Cdm_not_supported;
+    }
+#endif
+    if (!Preferences::GetBool("media.gmp-widevinecdm.enabled", false)) {
+      aOutMessage = NS_LITERAL_CSTRING("Widevine EME disabled");
+      return MediaKeySystemStatus::Cdm_disabled;
+    }
     return EnsureMinCDMVersion(mps, aKeySystem, aMinCdmVersion, aOutMessage, aOutCdmVersion);
   }
+#endif
 
   return MediaKeySystemStatus::Cdm_not_supported;
 }

dom/media/gmp/GMPChild.cpp

@@ -21,7 +21,9 @@
 #include "mozilla/dom/CrashReporterChild.h"
 #include "GMPUtils.h"
 #include "prio.h"
+#ifdef MOZ_WIDEVINE_EME
 #include "widevine-adapter/WidevineAdapter.h"
+#endif
 
 using mozilla::dom::CrashReporterChild;
 
@@ -379,8 +381,12 @@ GMPChild::AnswerStartPlugin(const nsString& aAdapter)
   }
 #endif
 
-  GMPAdapter* adapter = aAdapter.EqualsLiteral("widevine")
-                      ? new WidevineAdapter() : nullptr;
+  GMPAdapter* adapter = nullptr;
+#ifdef MOZ_WIDEVINE_EME
+  if (aAdapter.EqualsLiteral("widevine")) {
+    adapter = new WidevineAdapter();
+  }
+#endif
   if (!mGMPLoader->Load(libPath.get(),
                         libPath.Length(),
                         mNodeId.BeginWriting(),

dom/media/gmp/GMPParent.cpp

@@ -22,7 +22,6 @@
 #include "mozilla/SandboxInfo.h"
 #endif
 #include "GMPContentParent.h"
-#include "widevine-adapter/WidevineAdapter.h"
 
 #include "mozilla/dom/CrashReporterParent.h"
 using mozilla::dom::CrashReporterParent;
@@ -35,7 +34,11 @@ using CrashReporter::GetIDFromMinidump;
 #endif
 
 #include "mozilla/Telemetry.h"
+
+#ifdef MOZ_WIDEVINE_EME
 #include "mozilla/dom/WidevineCDMManifestBinding.h"
+#include "widevine-adapter/WidevineAdapter.h"
+#endif
 
 namespace mozilla {
 
@@ -785,6 +788,7 @@ GMPParent::ReadGMPMetaData()
     return ReadGMPInfoFile(infoFile);
   }
 
+#ifdef MOZ_WIDEVINE_EME
   // Maybe this is the Widevine adapted plugin?
   nsCOMPtr<nsIFile> manifestFile;
   rv = mDirectory->Clone(getter_AddRefs(manifestFile));
@@ -793,6 +797,9 @@ GMPParent::ReadGMPMetaData()
   }
   manifestFile->AppendRelativePath(NS_LITERAL_STRING("manifest.json"));
   return ReadChromiumManifestFile(manifestFile);
+#else
+  return InitPromise::CreateAndReject(rv, __func__);
+#endif
 }
 
 RefPtr<GMPParent::InitPromise>
@@ -892,6 +899,7 @@ GMPParent::ReadGMPInfoFile(nsIFile* aFile)
   return InitPromise::CreateAndResolve(NS_OK, __func__);
 }
 
+#ifdef MOZ_WIDEVINE_EME
 RefPtr<GMPParent::InitPromise>
 GMPParent::ReadChromiumManifestFile(nsIFile* aFile)
 {
@@ -949,6 +957,7 @@ GMPParent::ParseChromiumManifest(nsString aJSON)
 
   return InitPromise::CreateAndResolve(NS_OK, __func__);
 }
+#endif
 
 bool
 GMPParent::CanBeSharedCrossNodeIds() const

dom/media/gmp/GMPParent.h

@@ -169,8 +169,10 @@ private:
   bool EnsureProcessLoaded();
   RefPtr<InitPromise> ReadGMPMetaData();
   RefPtr<InitPromise> ReadGMPInfoFile(nsIFile* aFile);
-  RefPtr<InitPromise> ReadChromiumManifestFile(nsIFile* aFile);
+#ifdef MOZ_WIDEVINE_EME
   RefPtr<InitPromise> ParseChromiumManifest(nsString aJSON); // Main thread.
+  RefPtr<InitPromise> ReadChromiumManifestFile(nsIFile* aFile); // GMP thread.
+#endif
 #ifdef MOZ_CRASHREPORTER
   void WriteExtraDataForMinidump(CrashReporter::AnnotationTable& notes);
   void GetCrashID(nsString& aResult);