[Chromecast] Make EME persistent license support optional

chromecast/renderer/key_systems_cast.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/renderer/key_systems_cast.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 12 matching lines @@
 using ::media::EmeSessionTypeSupport;
 using ::media::SupportedCodecs;
 
 namespace chromecast {
 namespace shell {
 namespace {
 
 #if defined(PLAYREADY_CDM_AVAILABLE)
 class PlayReadyKeySystemProperties : public ::media::KeySystemProperties {
  public:
+  explicit PlayReadyKeySystemProperties(bool persistent_license_support)
+      : persistent_license_support_(persistent_license_support) {
+  }
+
   std::string GetKeySystemName() const override {
     return media::kChromecastPlayreadyKeySystem;
   }
 
   bool IsSupportedInitDataType(EmeInitDataType init_data_type) const override {
     return init_data_type == EmeInitDataType::CENC;
   }
 
   SupportedCodecs GetSupportedCodecs() const override {
     return ::media::EME_CODEC_MP4_AAC | ::media::EME_CODEC_MP4_AVC1;
   }
 
   EmeConfigRule GetRobustnessConfigRule(
       EmeMediaType media_type,
       const std::string& requested_robustness) const override {
     return requested_robustness.empty() ? EmeConfigRule::SUPPORTED
                                         : EmeConfigRule::NOT_SUPPORTED;
   }
 
   EmeSessionTypeSupport GetPersistentLicenseSessionSupport() const override {
 #if defined(OS_ANDROID)
     return EmeSessionTypeSupport::NOT_SUPPORTED;
 #else
-    return EmeSessionTypeSupport::SUPPORTED;
+    return persistent_license_support_ ? EmeSessionTypeSupport::SUPPORTED
+        : EmeSessionType::NOT_SUPPORTED;
 #endif
   }
 
   EmeSessionTypeSupport GetPersistentReleaseMessageSessionSupport()
       const override {
     return EmeSessionTypeSupport::NOT_SUPPORTED;
   }
 
   EmeFeatureSupport GetPersistentStateSupport() const override {
     return EmeFeatureSupport::ALWAYS_ENABLED;
   }
   EmeFeatureSupport GetDistinctiveIdentifierSupport() const override {
     return EmeFeatureSupport::ALWAYS_ENABLED;
   }
+
+ private:
+  const bool persistent_license_support_;
 };
 #endif  // PLAYREADY_CDM_AVAILABLE
 
 }  // namespace
 
 void AddChromecastKeySystems(
     std::vector<std::unique_ptr<::media::KeySystemProperties>>*
-        key_systems_properties) {
+        key_systems_properties,
+    bool enable_persistent_license_support) {

[yucliu1, 2016/06/02 16:31:52]

Is the flag only for playready?

 #if defined(PLAYREADY_CDM_AVAILABLE)
-  key_systems_properties->emplace_back(new PlayReadyKeySystemProperties());
+  key_systems_properties->emplace_back(
+      new PlayReadyKeySystemProperties(enable_persistent_license_support));
 #endif  // defined(PLAYREADY_CDM_AVAILABLE)
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
   using Robustness = cdm::WidevineKeySystemProperties::Robustness;
   ::media::SupportedCodecs codecs =
       ::media::EME_CODEC_MP4_AAC | ::media::EME_CODEC_MP4_AVC1 |
       ::media::EME_CODEC_WEBM_VP8 | ::media::EME_CODEC_WEBM_VP9;
   key_systems_properties->emplace_back(new cdm::WidevineKeySystemProperties(
       codecs,  // Regular codecs.
 #if defined(OS_ANDROID)
       codecs,  // Hardware-secure codecs.
 #endif
       Robustness::HW_SECURE_ALL,             // Max audio robustness.
       Robustness::HW_SECURE_ALL,             // Max video robustness.
       EmeSessionTypeSupport::NOT_SUPPORTED,  // persistent-license.
       EmeSessionTypeSupport::NOT_SUPPORTED,  // persistent-release-message.
       // Note: On Chromecast, all CDMs may have persistent state.
       EmeFeatureSupport::ALWAYS_ENABLED,    // Persistent state.
       EmeFeatureSupport::ALWAYS_ENABLED));  // Distinctive identifier.
 #endif  // defined(WIDEVINE_CDM_AVAILABLE)
 }
 
 }  // namespace shell
 }  // namespace chromecast