Implement robustness strings in requestMediaKeySystemAccess().

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"
 #include "chromecast/media/base/key_systems_common.h"
 #include "components/cdm/renderer/widevine_key_systems.h"
 #include "media/base/eme_constants.h"
 
 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
 
 namespace chromecast {
 namespace shell {
 
 void AddKeySystemWithCodecs(
     const std::string& key_system_name,
     std::vector<::media::KeySystemInfo>* key_systems_info) {
   ::media::KeySystemInfo info;
   info.key_system = key_system_name;
+  info.supported_init_data_types = ::media::EME_INIT_DATA_TYPE_CENC;
   info.supported_codecs =
       ::media::EME_CODEC_MP4_AAC | ::media::EME_CODEC_MP4_AVC1;
-  info.supported_init_data_types = ::media::EME_INIT_DATA_TYPE_CENC;
+  info.max_audio_robustness = ::media::EmeRobustness::EMPTY;
+  info.max_video_robustness = ::media::EmeRobustness::EMPTY;

[lcwu1, 2015/03/23 23:23:54]

From the spec, it appears that the robustness level is key system dependent.
However, the current robustness level enum you propose/use appears to be
Widevine specific. How do you envision other key systems (say PlayReady) use
this enum?

[sandersd (OOO until July 31), 2015/03/23 23:42:51]

I envision that other values would be added to the enum and that the comparison
method would be updated to understand them.

   info.persistent_license_support = ::media::EME_SESSION_TYPE_NOT_SUPPORTED;
   info.persistent_release_message_support =
       ::media::EME_SESSION_TYPE_NOT_SUPPORTED;
   info.persistent_state_support = ::media::EME_FEATURE_ALWAYS_ENABLED;
   info.distinctive_identifier_support = ::media::EME_FEATURE_ALWAYS_ENABLED;
   key_systems_info->push_back(info);
 }
 
 void AddChromecastKeySystems(
     std::vector<::media::KeySystemInfo>* key_systems_info) {
 #if defined(WIDEVINE_CDM_AVAILABLE)
   AddWidevineWithCodecs(
       cdm::WIDEVINE,
       ::media::EME_CODEC_MP4_AAC | ::media::EME_CODEC_MP4_AVC1,
-      ::media::EME_SESSION_TYPE_NOT_SUPPORTED,  // Persistent license.
-      ::media::EME_SESSION_TYPE_NOT_SUPPORTED,  // Persistent release message.
-      ::media::EME_FEATURE_NOT_SUPPORTED,       // Persistent state.
-      ::media::EME_FEATURE_ALWAYS_ENABLED,      // Distinctive identifier.
+      ::media::EmeRobustness::HW_SECURE_CRYPTO,  // Max audio robustness.
+      ::media::EmeRobustness::HW_SECURE_ALL,     // Max video robustness.
+      ::media::EME_SESSION_TYPE_NOT_SUPPORTED,   // persistent-license.
+      ::media::EME_SESSION_TYPE_NOT_SUPPORTED,   // persistent-release-message.
+      ::media::EME_FEATURE_NOT_SUPPORTED,        // Persistent state.
+      ::media::EME_FEATURE_ALWAYS_ENABLED,       // Distinctive identifier.
       key_systems_info);
 #endif
 
 #if defined(PLAYREADY_CDM_AVAILABLE)
   AddKeySystemWithCodecs(media::kChromecastPlayreadyKeySystem,
                          key_systems_info);
 #endif
 }
 
 }  // namespace shell
 }  // namespace chromecast