Reland of "Convert Widevine and Android platform key systems to KeySystemProperties" with fix

components/cdm/renderer/widevine_key_system_properties.cc

+// Copyright 2016 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/widevine_key_system_properties.h"
+
+#include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
+
+#if defined(WIDEVINE_CDM_AVAILABLE)
+
+using media::EmeConfigRule;
+using media::EmeFeatureSupport;
+using media::EmeInitDataType;
+using media::EmeMediaType;
+using media::EmeRobustness;
+using media::EmeSessionTypeSupport;
+using media::SupportedCodecs;
+
+namespace cdm {
+namespace {
+
+EmeRobustness ConvertRobustness(const std::string& robustness) {
+  if (robustness.empty())
+    return EmeRobustness::EMPTY;
+  if (robustness == "SW_SECURE_CRYPTO")
+    return EmeRobustness::SW_SECURE_CRYPTO;
+  if (robustness == "SW_SECURE_DECODE")
+    return EmeRobustness::SW_SECURE_DECODE;
+  if (robustness == "HW_SECURE_CRYPTO")
+    return EmeRobustness::HW_SECURE_CRYPTO;
+  if (robustness == "HW_SECURE_DECODE")
+    return EmeRobustness::HW_SECURE_DECODE;
+  if (robustness == "HW_SECURE_ALL")
+    return EmeRobustness::HW_SECURE_ALL;
+  return EmeRobustness::INVALID;
+}
+
+}  // namespace
+
+WidevineKeySystemProperties::WidevineKeySystemProperties(
+    media::SupportedCodecs supported_codecs,
+#if defined(OS_ANDROID)
+    media::SupportedCodecs supported_secure_codecs,
+#endif  // defined(OS_ANDROID)
+    media::EmeRobustness max_audio_robustness,
+    media::EmeRobustness max_video_robustness,
+    media::EmeSessionTypeSupport persistent_license_support,
+    media::EmeSessionTypeSupport persistent_release_message_support,
+    media::EmeFeatureSupport persistent_state_support,
+    media::EmeFeatureSupport distinctive_identifier_support)
+    : supported_codecs_(supported_codecs),
+#if defined(OS_ANDROID)
+      supported_secure_codecs_(supported_secure_codecs),
+#endif  // defined(OS_ANDROID)
+      max_audio_robustness_(max_audio_robustness),
+      max_video_robustness_(max_video_robustness),
+      persistent_license_support_(persistent_license_support),
+      persistent_release_message_support_(persistent_release_message_support),
+      persistent_state_support_(persistent_state_support),
+      distinctive_identifier_support_(distinctive_identifier_support) {
+}
+
+std::string WidevineKeySystemProperties::GetKeySystemName() const {
+  return kWidevineKeySystem;
+}
+
+bool WidevineKeySystemProperties::IsSupportedInitDataType(
+    EmeInitDataType init_data_type) const {
+  // Here we assume that support for a container imples support for the
+  // associated initialization data type. KeySystems handles validating
+  // |init_data_type| x |container| pairings.
+  if (init_data_type == EmeInitDataType::WEBM)
+    return (supported_codecs_ & media::EME_CODEC_WEBM_ALL) != 0;
+#if defined(USE_PROPRIETARY_CODECS)
+  if (init_data_type == EmeInitDataType::CENC)
+    return (supported_codecs_ & media::EME_CODEC_MP4_ALL) != 0;
+#endif  // defined(USE_PROPRIETARY_CODECS)
+
+  return false;
+}
+
+SupportedCodecs WidevineKeySystemProperties::GetSupportedCodecs() const {
+  return supported_codecs_;
+}
+
+#if defined(OS_ANDROID)
+SupportedCodecs WidevineKeySystemProperties::GetSupportedSecureCodecs() const {
+  return supported_secure_codecs_;
+}
+#endif
+
+EmeConfigRule WidevineKeySystemProperties::GetRobustnessConfigRule(
+    EmeMediaType media_type,
+    const std::string& requested_robustness) const {
+  EmeRobustness robustness = ConvertRobustness(requested_robustness);
+  if (robustness == EmeRobustness::INVALID)
+    return EmeConfigRule::NOT_SUPPORTED;
+
+  EmeRobustness max_robustness = EmeRobustness::INVALID;
+  switch (media_type) {
+    case EmeMediaType::AUDIO:
+      max_robustness = max_audio_robustness_;
+      break;
+    case EmeMediaType::VIDEO:
+      max_robustness = max_video_robustness_;
+      break;
+  }
+
+  // We can compare robustness levels whenever they are not HW_SECURE_CRYPTO
+  // and SW_SECURE_DECODE in some order. If they are exactly those two then the
+  // robustness requirement is not supported.
+  if ((max_robustness == EmeRobustness::HW_SECURE_CRYPTO &&
+       robustness == EmeRobustness::SW_SECURE_DECODE) ||
+      (max_robustness == EmeRobustness::SW_SECURE_DECODE &&
+       robustness == EmeRobustness::HW_SECURE_CRYPTO) ||
+      robustness > max_robustness) {
+    return EmeConfigRule::NOT_SUPPORTED;
+  }
+
+#if defined(OS_CHROMEOS)
+  // TODO(ddorwin): Remove this once we have confirmed it is not necessary.
+  // See https://crbug.com/482277
+  if (robustness == EmeRobustness::EMPTY)
+    return EmeConfigRule::SUPPORTED;
+
+  // Hardware security requires remote attestation.
+  if (robustness >= EmeRobustness::HW_SECURE_CRYPTO)
+    return EmeConfigRule::IDENTIFIER_REQUIRED;
+
+  // For video, recommend remote attestation if HW_SECURE_ALL is available,
+  // because it enables hardware accelerated decoding.
+  // TODO(sandersd): Only do this when hardware accelerated decoding is
+  // available for the requested codecs.
+  if (media_type == EmeMediaType::VIDEO &&
+      max_robustness == EmeRobustness::HW_SECURE_ALL) {
+    return EmeConfigRule::IDENTIFIER_RECOMMENDED;
+  }
+#elif defined(OS_ANDROID)
+  // Require hardware secure codecs when SW_SECURE_DECODE or above is specified.
+  if (robustness >= EmeRobustness::SW_SECURE_DECODE) {
+    return EmeConfigRule::HW_SECURE_CODECS_REQUIRED;
+  }
+#endif  // defined(OS_CHROMEOS)
+
+  return EmeConfigRule::SUPPORTED;
+}
+
+EmeSessionTypeSupport
+WidevineKeySystemProperties::GetPersistentLicenseSessionSupport() const {
+  return persistent_license_support_;
+}
+
+EmeSessionTypeSupport
+WidevineKeySystemProperties::GetPersistentReleaseMessageSessionSupport() const {
+  return persistent_release_message_support_;
+}
+
+EmeFeatureSupport WidevineKeySystemProperties::GetPersistentStateSupport()
+    const {
+  return persistent_state_support_;
+}
+
+EmeFeatureSupport WidevineKeySystemProperties::GetDistinctiveIdentifierSupport()
+    const {
+  return distinctive_identifier_support_;
+}
+
+#if defined(ENABLE_PEPPER_CDMS)
+std::string WidevineKeySystemProperties::GetPepperType() const {
+  return kWidevineCdmPluginMimeType;
+}
+#endif
+
+}  // namespace cdm
+
+#endif  // WIDEVINE_CDM_AVAILABLE