Convert Widevine and Android platform key systems to KeySystemProperties

components/cdm/renderer/android_key_systems.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 "components/cdm/renderer/android_key_systems.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "components/cdm/common/cdm_messages_android.h"
-#include "components/cdm/renderer/widevine_key_systems.h"
+#include "components/cdm/renderer/widevine_key_system_properties.h"
 #include "content/public/renderer/render_thread.h"
 #include "media/base/eme_constants.h"
 #include "media/base/media_switches.h"
 
 #include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
 
+using media::EmeConfigRule;
 using media::EmeFeatureSupport;
+using media::EmeInitDataType;
 using media::EmeRobustness;
 using media::EmeSessionTypeSupport;
-using media::KeySystemInfo;
+using media::KeySystemProperties;
 using media::SupportedCodecs;
 
 namespace cdm {
 
+namespace {
+
+// Implementation of KeySystemProperties for platform-supported key systems.
+// Assumes that platform key systems support no features but can and will
+// make use of persistence and identifiers.
+class AndroidPlatformKeySystemProperties : public KeySystemProperties {
+ public:
+  AndroidPlatformKeySystemProperties(const std::string& name,
+                                     SupportedCodecs supported_codecs)
+      : name_(name), supported_codecs_(supported_codecs) {}

[ddorwin, 2016/04/27 22:41:54]

In the future, we'll need some value other than the name to pass across Mojo.

[halliwell, 2016/04/27 23:50:45]

Acknowledged.

+
+  std::string GetKeySystemName() const override { return name_; }
+
+  bool IsSupportedInitDataType(EmeInitDataType init_data_type) const override {
+    // Here we assume that support for a container implies support for the
+    // associated initialization data type. KeySystems handles validating
+    // |init_data_type| x |container| pairings.

[ddorwin, 2016/04/27 22:41:54]

What does this mean?

[halliwell, 2016/04/27 23:50:45]

This is a copy-paste from key_systems.cc.  Do you or xhwang@ know? :)

+    if (init_data_type == EmeInitDataType::WEBM)

[ddorwin, 2016/04/27 22:41:54]

Can we force the caller to make this assumption instead? I guess that's
independent of this CL.
See also https://bugs.chromium.org/p/chromium/issues/detail?id=589521 (and
https://bugs.chromium.org/p/chromium/issues/detail?id=589515).

[halliwell, 2016/04/27 23:50:45]

Ack, follow up on those bugs separately?

+      return (supported_codecs_ & media::EME_CODEC_WEBM_ALL) != 0;
+#if defined(USE_PROPRIETARY_CODECS)
+    if (init_data_type == EmeInitDataType::CENC)

[ddorwin, 2016/04/27 22:41:54]

Use a switch statement instead?
Then explicitly list KEYIDS.

[halliwell, 2016/04/27 23:50:45]

Done.

+      return (supported_codecs_ & media::EME_CODEC_MP4_ALL) != 0;
+#endif  // defined(USE_PROPRIETARY_CODECS)
+    return false;
+  }
+
+  SupportedCodecs GetSupportedCodecs() const override {
+    return supported_codecs_;
+  }
+
+  EmeConfigRule GetRobustnessConfigRule(
+      media::EmeMediaType media_type,
+      const std::string& requested_robustness) const override {
+    return requested_robustness.empty() ? EmeConfigRule::SUPPORTED
+                                        : EmeConfigRule::NOT_SUPPORTED;
+  }
+
+  EmeSessionTypeSupport GetPersistentLicenseSessionSupport() const override {
+    return EmeSessionTypeSupport::NOT_SUPPORTED;
+  }
+  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:
+  std::string name_;

[ddorwin, 2016/04/27 22:41:54]

nit: can be consts

[halliwell, 2016/04/27 23:50:45]

Done.

+  SupportedCodecs supported_codecs_;
+};
+
+}  // namespace
+
 static SupportedKeySystemResponse QueryKeySystemSupport(
     const std::string& key_system) {
   SupportedKeySystemRequest request;
   SupportedKeySystemResponse response;
 
   request.key_system = key_system;
   request.codecs = media::EME_CODEC_ALL;
   content::RenderThread::Get()->Send(
       new ChromeViewHostMsg_QueryKeySystemSupport(request, &response));
   DCHECK(!(response.compositing_codecs & ~media::EME_CODEC_ALL))
       << "unrecognized codec";
   DCHECK(!(response.non_compositing_codecs & ~media::EME_CODEC_ALL))
       << "unrecognized codec";
   return response;
 }
 
-void AddAndroidWidevine(std::vector<KeySystemInfo>* concrete_key_systems) {
+void AddAndroidWidevine(
+    std::vector<std::unique_ptr<KeySystemProperties>>* concrete_key_systems) {
   SupportedKeySystemResponse response = QueryKeySystemSupport(
       kWidevineKeySystem);
 
   // Since we do not control the implementation of the MediaDrm API on Android,
   // we assume that it can and will make use of persistence even though no
   // persistence-based features are supported.
 
   if (response.compositing_codecs != media::EME_CODEC_NONE) {
-    AddWidevineWithCodecs(
+    concrete_key_systems->emplace_back(new WidevineKeySystemProperties(
         response.compositing_codecs,           // Regular codecs.
         response.non_compositing_codecs,       // Hardware-secure codecs.
         EmeRobustness::HW_SECURE_CRYPTO,       // Max audio robustness.
         EmeRobustness::HW_SECURE_ALL,          // Max video robustness.
         EmeSessionTypeSupport::NOT_SUPPORTED,  // persistent-license.
         EmeSessionTypeSupport::NOT_SUPPORTED,  // persistent-release-message.
         EmeFeatureSupport::ALWAYS_ENABLED,     // Persistent state.
-        EmeFeatureSupport::ALWAYS_ENABLED,     // Distinctive identifier.
-        concrete_key_systems);
+        EmeFeatureSupport::ALWAYS_ENABLED));   // Distinctive identifier.
   } else {
     // It doesn't make sense to support secure codecs but not regular codecs.
     DCHECK(response.non_compositing_codecs == media::EME_CODEC_NONE);
   }
 }
 
 void AddAndroidPlatformKeySystems(
-    std::vector<KeySystemInfo>* concrete_key_systems) {
+    std::vector<std::unique_ptr<KeySystemProperties>>* concrete_key_systems) {
   std::vector<std::string> key_system_names;
   content::RenderThread::Get()->Send(
       new ChromeViewHostMsg_GetPlatformKeySystemNames(&key_system_names));
 
   for (std::vector<std::string>::const_iterator it = key_system_names.begin();
        it != key_system_names.end(); ++it) {
     SupportedKeySystemResponse response = QueryKeySystemSupport(*it);
     if (response.compositing_codecs != media::EME_CODEC_NONE) {
-      KeySystemInfo info;
-      info.key_system = *it;
-      info.supported_codecs = response.compositing_codecs;
-      // Here we assume that support for a container implies support for the
-      // associated initialization data type. KeySystems handles validating
-      // |init_data_type| x |container| pairings.
-      if (response.compositing_codecs & media::EME_CODEC_WEBM_ALL)
-        info.supported_init_data_types |= media::kInitDataTypeMaskWebM;
-#if defined(USE_PROPRIETARY_CODECS)
-      if (response.compositing_codecs & media::EME_CODEC_MP4_ALL)
-        info.supported_init_data_types |= media::kInitDataTypeMaskCenc;
-#endif  // defined(USE_PROPRIETARY_CODECS)
-      info.max_audio_robustness = EmeRobustness::EMPTY;
-      info.max_video_robustness = EmeRobustness::EMPTY;
-      // Assume that platform key systems support no features but can and will
-      // make use of persistence and identifiers.
-      info.persistent_license_support =
-          media::EmeSessionTypeSupport::NOT_SUPPORTED;
-      info.persistent_release_message_support =
-          media::EmeSessionTypeSupport::NOT_SUPPORTED;
-      info.persistent_state_support = media::EmeFeatureSupport::ALWAYS_ENABLED;
-      info.distinctive_identifier_support =
-          media::EmeFeatureSupport::ALWAYS_ENABLED;
-      concrete_key_systems->push_back(info);
+      concrete_key_systems->emplace_back(new AndroidPlatformKeySystemProperties(
+          *it, response.compositing_codecs));
     }
   }
 }
 
 }  // namespace cdm