| // Copyright 2013 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 "media/base/key_systems.h" |
| |
| |
| #include "base/containers/hash_tables.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| #include "base/strings/string_util.h" |
| #include "base/threading/thread_checker.h" |
| #include "base/time/time.h" |
| #include "media/base/key_system_info.h" |
| #include "media/base/key_systems_support_uma.h" |
| #include "media/base/media_client.h" |
| #include "media/cdm/key_system_names.h" |
| #include "third_party/widevine/cdm/widevine_cdm_common.h" |
| |
| namespace media { |
| |
| const char kClearKeyKeySystem[] = "org.w3.clearkey"; |
| const char kPrefixedClearKeyKeySystem[] = "webkit-org.w3.clearkey"; |
| const char kUnsupportedClearKeyKeySystem[] = "unsupported-org.w3.clearkey"; |
| |
| // These names are used by UMA. Do not change them! |
| const char kClearKeyKeySystemNameForUMA[] = "ClearKey"; |
| const char kUnknownKeySystemNameForUMA[] = "Unknown"; |
| |
| struct NamedCodec { |
| const char* name; |
| EmeCodec type; |
| }; |
| |
| // Mapping between containers and their codecs. |
| // Only audio codec can belong to a "audio/*" container. Both audio and video |
| // codecs can belong to a "video/*" container. |
| // TODO(sandersd): This definition only makes sense for prefixed EME. Change it |
| // when prefixed EME is removed. http://crbug.com/249976 |
| static NamedCodec kContainerToCodecMasks[] = { |
| {"audio/webm", EME_CODEC_WEBM_AUDIO_ALL}, |
| {"video/webm", EME_CODEC_WEBM_ALL}, |
| #if defined(USE_PROPRIETARY_CODECS) |
| {"audio/mp4", EME_CODEC_MP4_AUDIO_ALL}, |
| {"video/mp4", EME_CODEC_MP4_ALL} |
| #endif // defined(USE_PROPRIETARY_CODECS) |
| }; |
| |
| // Mapping between codec names and enum values. |
| static NamedCodec kCodecStrings[] = { |
| {"opus", EME_CODEC_WEBM_OPUS}, |
| {"vorbis", EME_CODEC_WEBM_VORBIS}, |
| {"vp8", EME_CODEC_WEBM_VP8}, |
| {"vp8.0", EME_CODEC_WEBM_VP8}, |
| {"vp9", EME_CODEC_WEBM_VP9}, |
| {"vp9.0", EME_CODEC_WEBM_VP9}, |
| #if defined(USE_PROPRIETARY_CODECS) |
| {"mp4a", EME_CODEC_MP4_AAC}, |
| {"avc1", EME_CODEC_MP4_AVC1}, |
| {"avc3", EME_CODEC_MP4_AVC1} |
| #endif // defined(USE_PROPRIETARY_CODECS) |
| }; |
| |
| static 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; |
| } |
| |
| static void AddClearKey(std::vector<KeySystemInfo>* concrete_key_systems) { |
| KeySystemInfo info; |
| info.key_system = kClearKeyKeySystem; |
| |
| // On Android, Vorbis, VP8, AAC and AVC1 are supported in MediaCodec: |
| // http://developer.android.com/guide/appendix/media-formats.html |
| // VP9 support is device dependent. |
| |
| info.supported_init_data_types = |
| kInitDataTypeMaskWebM | kInitDataTypeMaskKeyIds; |
| info.supported_codecs = EME_CODEC_WEBM_ALL; |
| |
| #if defined(OS_ANDROID) |
| // Temporarily disable VP9 support for Android. |
| // TODO(xhwang): Use mime_util.h to query VP9 support on Android. |
| info.supported_codecs &= ~EME_CODEC_WEBM_VP9; |
| |
| // Opus is not supported on Android yet. http://crbug.com/318436. |
| // TODO(sandersd): Check for platform support to set this bit. |
| info.supported_codecs &= ~EME_CODEC_WEBM_OPUS; |
| #endif // defined(OS_ANDROID) |
| |
| #if defined(USE_PROPRIETARY_CODECS) |
| info.supported_init_data_types |= kInitDataTypeMaskCenc; |
| info.supported_codecs |= EME_CODEC_MP4_ALL; |
| #endif // defined(USE_PROPRIETARY_CODECS) |
| |
| info.max_audio_robustness = EmeRobustness::EMPTY; |
| info.max_video_robustness = EmeRobustness::EMPTY; |
| info.persistent_license_support = EmeSessionTypeSupport::NOT_SUPPORTED; |
| info.persistent_release_message_support = |
| EmeSessionTypeSupport::NOT_SUPPORTED; |
| info.persistent_state_support = EmeFeatureSupport::NOT_SUPPORTED; |
| info.distinctive_identifier_support = EmeFeatureSupport::NOT_SUPPORTED; |
| |
| info.use_aes_decryptor = true; |
| |
| concrete_key_systems->push_back(info); |
| } |
| |
| // Returns whether the |key_system| is known to Chromium and is thus likely to |
| // be implemented in an interoperable way. |
| // True is always returned for a |key_system| that begins with "x-". |
| // |
| // As with other web platform features, advertising support for a key system |
| // implies that it adheres to a defined and interoperable specification. |
| // |
| // To ensure interoperability, implementations of a specific |key_system| string |
| // must conform to a specification for that identifier that defines |
| // key system-specific behaviors not fully defined by the EME specification. |
| // That specification should be provided by the owner of the domain that is the |
| // reverse of the |key_system| string. |
| // This involves more than calling a library, SDK, or platform API. |
| // KeySystemsImpl must be populated appropriately, and there will likely be glue |
| // code to adapt to the API of the library, SDK, or platform API. |
| // |
| // Chromium mainline contains this data and glue code for specific key systems, |
| // which should help ensure interoperability with other implementations using |
| // these key systems. |
| // |
| // If you need to add support for other key systems, ensure that you have |
| // obtained the specification for how to integrate it with EME, implemented the |
| // appropriate glue/adapter code, and added all the appropriate data to |
| // KeySystemsImpl. Only then should you change this function. |
| static bool IsPotentiallySupportedKeySystem(const std::string& key_system) { |
| // Known and supported key systems. |
| if (key_system == kWidevineKeySystem) |
| return true; |
| if (key_system == kClearKey) |
| return true; |
| |
| // External Clear Key is known and supports suffixes for testing. |
| if (IsExternalClearKey(key_system)) |
| return true; |
| |
| // Chromecast defines behaviors for Cast clients within its reverse domain. |
| const char kChromecastRoot[] = "com.chromecast"; |
| if (IsParentKeySystemOf(kChromecastRoot, key_system)) |
| return true; |
| |
| // Implementations that do not have a specification or appropriate glue code |
| // can use the "x-" prefix to avoid conflicting with and advertising support |
| // for real key system names. Use is discouraged. |
| const char kExcludedPrefix[] = "x-"; |
| if (key_system.find(kExcludedPrefix, 0, arraysize(kExcludedPrefix) - 1) == 0) |
| return true; |
| |
| return false; |
| } |
| |
| class KeySystemsImpl : public KeySystems { |
| public: |
| static KeySystemsImpl* GetInstance(); |
| |
| void UpdateIfNeeded(); |
| |
| bool IsConcreteSupportedKeySystem(const std::string& key_system) const; |
| |
| bool PrefixedIsSupportedKeySystemWithMediaMimeType( |
| const std::string& mime_type, |
| const std::vector<std::string>& codecs, |
| const std::string& key_system); |
| |
| std::string GetKeySystemNameForUMA(const std::string& key_system) const; |
| |
| bool UseAesDecryptor(const std::string& concrete_key_system) const; |
| |
| #if defined(ENABLE_PEPPER_CDMS) |
| std::string GetPepperType(const std::string& concrete_key_system) const; |
| #endif |
| |
| void AddContainerMask(const std::string& container, uint32 mask); |
| void AddCodecMask( |
| EmeMediaType media_type, |
| const std::string& codec, |
| uint32 mask); |
| |
| // Implementation of KeySystems interface. |
| bool IsSupportedKeySystem(const std::string& key_system) const override; |
| |
| bool IsSupportedInitDataType(const std::string& key_system, |
| EmeInitDataType init_data_type) const override; |
| |
| EmeConfigRule GetContentTypeConfigRule( |
| const std::string& key_system, |
| EmeMediaType media_type, |
| const std::string& container_mime_type, |
| const std::vector<std::string>& codecs) const override; |
| |
| EmeConfigRule GetRobustnessConfigRule( |
| const std::string& key_system, |
| EmeMediaType media_type, |
| const std::string& requested_robustness) const override; |
| |
| EmeSessionTypeSupport GetPersistentLicenseSessionSupport( |
| const std::string& key_system) const override; |
| |
| EmeSessionTypeSupport GetPersistentReleaseMessageSessionSupport( |
| const std::string& key_system) const override; |
| |
| EmeFeatureSupport GetPersistentStateSupport( |
| const std::string& key_system) const override; |
| |
| EmeFeatureSupport GetDistinctiveIdentifierSupport( |
| const std::string& key_system) const override; |
| |
| private: |
| KeySystemsImpl(); |
| ~KeySystemsImpl() override; |
| |
| void InitializeUMAInfo(); |
| |
| void UpdateSupportedKeySystems(); |
| |
| void AddConcreteSupportedKeySystems( |
| const std::vector<KeySystemInfo>& concrete_key_systems); |
| |
| friend struct base::DefaultLazyInstanceTraits<KeySystemsImpl>; |
| |
| typedef base::hash_map<std::string, KeySystemInfo> KeySystemInfoMap; |
| typedef base::hash_map<std::string, std::string> ParentKeySystemMap; |
| typedef base::hash_map<std::string, SupportedCodecs> ContainerCodecsMap; |
| typedef base::hash_map<std::string, EmeCodec> CodecsMap; |
| typedef base::hash_map<std::string, EmeInitDataType> InitDataTypesMap; |
| typedef base::hash_map<std::string, std::string> KeySystemNameForUMAMap; |
| |
| // TODO(sandersd): Separate container enum from codec mask value. |
| // http://crbug.com/417440 |
| SupportedCodecs GetCodecMaskForContainer( |
| const std::string& container) const; |
| EmeCodec GetCodecForString(const std::string& codec) const; |
| |
| const std::string& PrefixedGetConcreteKeySystemNameFor( |
| const std::string& key_system) const; |
| |
| // Returns whether a |container| type is supported by checking |
| // |key_system_supported_codecs|. |
| // TODO(xhwang): Update this to actually check initDataType support. |
| bool IsSupportedContainer(const std::string& container, |
| SupportedCodecs key_system_supported_codecs) const; |
| |
| // Returns true if all |codecs| are supported in |container| by checking |
| // |key_system_supported_codecs|. |
| bool IsSupportedContainerAndCodecs( |
| const std::string& container, |
| const std::vector<std::string>& codecs, |
| SupportedCodecs key_system_supported_codecs) const; |
| |
| // Map from key system string to capabilities. |
| KeySystemInfoMap concrete_key_system_map_; |
| |
| // Map from parent key system to the concrete key system that should be used |
| // to represent its capabilities. |
| ParentKeySystemMap parent_key_system_map_; |
| |
| KeySystemsSupportUMA key_systems_support_uma_; |
| |
| ContainerCodecsMap container_to_codec_mask_map_; |
| CodecsMap codec_string_map_; |
| KeySystemNameForUMAMap key_system_name_for_uma_map_; |
| |
| SupportedCodecs audio_codec_mask_; |
| SupportedCodecs video_codec_mask_; |
| |
| // Makes sure all methods are called from the same thread. |
| base::ThreadChecker thread_checker_; |
| |
| DISALLOW_COPY_AND_ASSIGN(KeySystemsImpl); |
| }; |
| |
| static base::LazyInstance<KeySystemsImpl>::Leaky g_key_systems = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| KeySystemsImpl* KeySystemsImpl::GetInstance() { |
| KeySystemsImpl* key_systems = g_key_systems.Pointer(); |
| key_systems->UpdateIfNeeded(); |
| return key_systems; |
| } |
| |
| // Because we use a LazyInstance, the key systems info must be populated when |
| // the instance is lazily initiated. |
| KeySystemsImpl::KeySystemsImpl() : |
| audio_codec_mask_(EME_CODEC_AUDIO_ALL), |
| video_codec_mask_(EME_CODEC_VIDEO_ALL) { |
| for (size_t i = 0; i < arraysize(kContainerToCodecMasks); ++i) { |
| const std::string& name = kContainerToCodecMasks[i].name; |
| DCHECK(!container_to_codec_mask_map_.count(name)); |
| container_to_codec_mask_map_[name] = kContainerToCodecMasks[i].type; |
| } |
| for (size_t i = 0; i < arraysize(kCodecStrings); ++i) { |
| const std::string& name = kCodecStrings[i].name; |
| DCHECK(!codec_string_map_.count(name)); |
| codec_string_map_[name] = kCodecStrings[i].type; |
| } |
| |
| InitializeUMAInfo(); |
| |
| // Always update supported key systems during construction. |
| UpdateSupportedKeySystems(); |
| } |
| |
| KeySystemsImpl::~KeySystemsImpl() { |
| } |
| |
| SupportedCodecs KeySystemsImpl::GetCodecMaskForContainer( |
| const std::string& container) const { |
| ContainerCodecsMap::const_iterator iter = |
| container_to_codec_mask_map_.find(container); |
| if (iter != container_to_codec_mask_map_.end()) |
| return iter->second; |
| return EME_CODEC_NONE; |
| } |
| |
| EmeCodec KeySystemsImpl::GetCodecForString(const std::string& codec) const { |
| CodecsMap::const_iterator iter = codec_string_map_.find(codec); |
| if (iter != codec_string_map_.end()) |
| return iter->second; |
| return EME_CODEC_NONE; |
| } |
| |
| const std::string& KeySystemsImpl::PrefixedGetConcreteKeySystemNameFor( |
| const std::string& key_system) const { |
| ParentKeySystemMap::const_iterator iter = |
| parent_key_system_map_.find(key_system); |
| if (iter != parent_key_system_map_.end()) |
| return iter->second; |
| return key_system; |
| } |
| |
| void KeySystemsImpl::InitializeUMAInfo() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(key_system_name_for_uma_map_.empty()); |
| |
| std::vector<KeySystemInfoForUMA> key_systems_info_for_uma; |
| if (GetMediaClient()) |
| GetMediaClient()->AddKeySystemsInfoForUMA(&key_systems_info_for_uma); |
| |
| for (const KeySystemInfoForUMA& info : key_systems_info_for_uma) { |
| key_system_name_for_uma_map_[info.key_system] = |
| info.key_system_name_for_uma; |
| if (info.reports_key_system_support_to_uma) |
| key_systems_support_uma_.AddKeySystemToReport(info.key_system); |
| } |
| |
| // Clear Key is always supported. |
| key_system_name_for_uma_map_[kClearKeyKeySystem] = |
| kClearKeyKeySystemNameForUMA; |
| } |
| |
| void KeySystemsImpl::UpdateIfNeeded() { |
| if (GetMediaClient() && GetMediaClient()->IsKeySystemsUpdateNeeded()) |
| UpdateSupportedKeySystems(); |
| } |
| |
| void KeySystemsImpl::UpdateSupportedKeySystems() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| concrete_key_system_map_.clear(); |
| parent_key_system_map_.clear(); |
| |
| // Build KeySystemInfo. |
| std::vector<KeySystemInfo> key_systems_info; |
| |
| // Add key systems supported by the MediaClient implementation. |
| if (GetMediaClient()) |
| GetMediaClient()->AddSupportedKeySystems(&key_systems_info); |
| |
| // Clear Key is always supported. |
| AddClearKey(&key_systems_info); |
| |
| AddConcreteSupportedKeySystems(key_systems_info); |
| } |
| |
| void KeySystemsImpl::AddConcreteSupportedKeySystems( |
| const std::vector<KeySystemInfo>& concrete_key_systems) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(concrete_key_system_map_.empty()); |
| DCHECK(parent_key_system_map_.empty()); |
| |
| for (const KeySystemInfo& info : concrete_key_systems) { |
| DCHECK(!info.key_system.empty()); |
| DCHECK(info.max_audio_robustness != EmeRobustness::INVALID); |
| DCHECK(info.max_video_robustness != EmeRobustness::INVALID); |
| DCHECK(info.persistent_license_support != EmeSessionTypeSupport::INVALID); |
| DCHECK(info.persistent_release_message_support != |
| EmeSessionTypeSupport::INVALID); |
| DCHECK(info.persistent_state_support != EmeFeatureSupport::INVALID); |
| DCHECK(info.distinctive_identifier_support != EmeFeatureSupport::INVALID); |
| |
| // Supporting persistent state is a prerequsite for supporting persistent |
| // sessions. |
| if (info.persistent_state_support == EmeFeatureSupport::NOT_SUPPORTED) { |
| DCHECK(info.persistent_license_support == |
| EmeSessionTypeSupport::NOT_SUPPORTED); |
| DCHECK(info.persistent_release_message_support == |
| EmeSessionTypeSupport::NOT_SUPPORTED); |
| } |
| |
| // persistent-release-message sessions are not currently supported. |
| // http://crbug.com/448888 |
| DCHECK(info.persistent_release_message_support == |
| EmeSessionTypeSupport::NOT_SUPPORTED); |
| |
| // If distinctive identifiers are not supported, then no other features can |
| // require them. |
| if (info.distinctive_identifier_support == |
| EmeFeatureSupport::NOT_SUPPORTED) { |
| DCHECK(info.persistent_license_support != |
| EmeSessionTypeSupport::SUPPORTED_WITH_IDENTIFIER); |
| DCHECK(info.persistent_release_message_support != |
| EmeSessionTypeSupport::SUPPORTED_WITH_IDENTIFIER); |
| } |
| |
| // Distinctive identifiers and persistent state can only be reliably blocked |
| // (and therefore be safely configurable) for Pepper-hosted key systems. For |
| // other platforms, (except for the AES decryptor) assume that the CDM can |
| // and will do anything. |
| bool can_block = info.use_aes_decryptor; |
| #if defined(ENABLE_PEPPER_CDMS) |
| DCHECK_EQ(info.use_aes_decryptor, info.pepper_type.empty()); |
| if (!info.pepper_type.empty()) |
| can_block = true; |
| #endif |
| if (!can_block) { |
| DCHECK(info.distinctive_identifier_support == |
| EmeFeatureSupport::ALWAYS_ENABLED); |
| DCHECK(info.persistent_state_support == |
| EmeFeatureSupport::ALWAYS_ENABLED); |
| } |
| |
| DCHECK(!IsConcreteSupportedKeySystem(info.key_system)) |
| << "Key system '" << info.key_system << "' already registered"; |
| DCHECK(!parent_key_system_map_.count(info.key_system)) |
| << "'" << info.key_system << "' is already registered as a parent"; |
| concrete_key_system_map_[info.key_system] = info; |
| if (!info.parent_key_system.empty()) { |
| DCHECK(!IsConcreteSupportedKeySystem(info.parent_key_system)) |
| << "Parent '" << info.parent_key_system << "' " |
| << "already registered concrete"; |
| DCHECK(!parent_key_system_map_.count(info.parent_key_system)) |
| << "Parent '" << info.parent_key_system << "' already registered"; |
| parent_key_system_map_[info.parent_key_system] = info.key_system; |
| } |
| } |
| } |
| |
| bool KeySystemsImpl::IsConcreteSupportedKeySystem( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| return concrete_key_system_map_.count(key_system) != 0; |
| } |
| |
| bool KeySystemsImpl::IsSupportedContainer( |
| const std::string& container, |
| SupportedCodecs key_system_supported_codecs) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!container.empty()); |
| |
| // When checking container support for EME, "audio/foo" should be treated the |
| // same as "video/foo". Convert the |container| to achieve this. |
| // TODO(xhwang): Replace this with real checks against supported initDataTypes |
| // combined with supported demuxers. |
| std::string canonical_container = container; |
| if (container.find("audio/") == 0) |
| canonical_container.replace(0, 6, "video/"); |
| |
| // A container is supported iif at least one codec in that container is |
| // supported. |
| SupportedCodecs supported_codecs = |
| GetCodecMaskForContainer(canonical_container); |
| return (supported_codecs & key_system_supported_codecs) != 0; |
| } |
| |
| bool KeySystemsImpl::IsSupportedContainerAndCodecs( |
| const std::string& container, |
| const std::vector<std::string>& codecs, |
| SupportedCodecs key_system_supported_codecs) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!container.empty()); |
| DCHECK(!codecs.empty()); |
| DCHECK(IsSupportedContainer(container, key_system_supported_codecs)); |
| |
| SupportedCodecs container_supported_codecs = |
| GetCodecMaskForContainer(container); |
| |
| for (size_t i = 0; i < codecs.size(); ++i) { |
| if (codecs[i].empty()) |
| continue; |
| |
| EmeCodec codec = GetCodecForString(codecs[i]); |
| |
| // Unsupported codec. |
| if (!(codec & key_system_supported_codecs)) |
| return false; |
| |
| // Unsupported codec/container combination, e.g. "video/webm" and "avc1". |
| if (!(codec & container_supported_codecs)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool KeySystemsImpl::IsSupportedInitDataType( |
| const std::string& key_system, |
| EmeInitDataType init_data_type) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| // Locate |key_system|. Only concrete key systems are supported in unprefixed. |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return false; |
| } |
| |
| // Check |init_data_type|. |
| InitDataTypeMask available_init_data_types = |
| key_system_iter->second.supported_init_data_types; |
| switch (init_data_type) { |
| case EmeInitDataType::UNKNOWN: |
| return false; |
| case EmeInitDataType::WEBM: |
| return (available_init_data_types & kInitDataTypeMaskWebM) != 0; |
| case EmeInitDataType::CENC: |
| return (available_init_data_types & kInitDataTypeMaskCenc) != 0; |
| case EmeInitDataType::KEYIDS: |
| return (available_init_data_types & kInitDataTypeMaskKeyIds) != 0; |
| } |
| NOTREACHED(); |
| return false; |
| } |
| |
| bool KeySystemsImpl::PrefixedIsSupportedKeySystemWithMediaMimeType( |
| const std::string& mime_type, |
| const std::vector<std::string>& codecs, |
| const std::string& key_system) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| const std::string& concrete_key_system = |
| PrefixedGetConcreteKeySystemNameFor(key_system); |
| |
| bool has_type = !mime_type.empty(); |
| |
| key_systems_support_uma_.ReportKeySystemQuery(key_system, has_type); |
| |
| // Check key system support. |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(concrete_key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) |
| return false; |
| |
| key_systems_support_uma_.ReportKeySystemSupport(key_system, false); |
| |
| if (!has_type) { |
| DCHECK(codecs.empty()); |
| return true; |
| } |
| |
| SupportedCodecs key_system_supported_codecs = |
| key_system_iter->second.supported_codecs; |
| |
| if (!IsSupportedContainer(mime_type, key_system_supported_codecs)) |
| return false; |
| |
| if (!codecs.empty() && |
| !IsSupportedContainerAndCodecs( |
| mime_type, codecs, key_system_supported_codecs)) { |
| return false; |
| } |
| |
| key_systems_support_uma_.ReportKeySystemSupport(key_system, true); |
| |
| return true; |
| } |
| |
| std::string KeySystemsImpl::GetKeySystemNameForUMA( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemNameForUMAMap::const_iterator iter = |
| key_system_name_for_uma_map_.find(key_system); |
| if (iter == key_system_name_for_uma_map_.end()) |
| return kUnknownKeySystemNameForUMA; |
| |
| return iter->second; |
| } |
| |
| bool KeySystemsImpl::UseAesDecryptor( |
| const std::string& concrete_key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(concrete_key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| DLOG(ERROR) << concrete_key_system << " is not a known concrete system"; |
| return false; |
| } |
| |
| return key_system_iter->second.use_aes_decryptor; |
| } |
| |
| #if defined(ENABLE_PEPPER_CDMS) |
| std::string KeySystemsImpl::GetPepperType( |
| const std::string& concrete_key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(concrete_key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| DLOG(FATAL) << concrete_key_system << " is not a known concrete system"; |
| return std::string(); |
| } |
| |
| const std::string& type = key_system_iter->second.pepper_type; |
| DLOG_IF(FATAL, type.empty()) << concrete_key_system << " is not Pepper-based"; |
| return type; |
| } |
| #endif |
| |
| void KeySystemsImpl::AddContainerMask( |
| const std::string& container, |
| uint32 mask) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!container_to_codec_mask_map_.count(container)); |
| container_to_codec_mask_map_[container] = static_cast<EmeCodec>(mask); |
| } |
| |
| void KeySystemsImpl::AddCodecMask( |
| EmeMediaType media_type, |
| const std::string& codec, |
| uint32 mask) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(!codec_string_map_.count(codec)); |
| codec_string_map_[codec] = static_cast<EmeCodec>(mask); |
| if (media_type == EmeMediaType::AUDIO) { |
| audio_codec_mask_ |= mask; |
| } else { |
| video_codec_mask_ |= mask; |
| } |
| } |
| |
| bool KeySystemsImpl::IsSupportedKeySystem(const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| if (!IsConcreteSupportedKeySystem(key_system)) |
| return false; |
| |
| // TODO(ddorwin): Move this to where we add key systems when prefixed EME is |
| // removed (crbug.com/249976). |
| if (!IsPotentiallySupportedKeySystem(key_system)) { |
| // If you encounter this path, see the comments for the above function. |
| DLOG(ERROR) << "Unrecognized key system " << key_system |
| << ". See code comments."; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| EmeConfigRule KeySystemsImpl::GetContentTypeConfigRule( |
| const std::string& key_system, |
| EmeMediaType media_type, |
| const std::string& container_mime_type, |
| const std::vector<std::string>& codecs) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| // Make sure the container matches |media_type|. |
| SupportedCodecs media_type_codec_mask = EME_CODEC_NONE; |
| switch (media_type) { |
| case EmeMediaType::AUDIO: |
| if (!base::StartsWith(container_mime_type, "audio/", |
| base::CompareCase::SENSITIVE)) |
| return EmeConfigRule::NOT_SUPPORTED; |
| media_type_codec_mask = audio_codec_mask_; |
| break; |
| case EmeMediaType::VIDEO: |
| if (!base::StartsWith(container_mime_type, "video/", |
| base::CompareCase::SENSITIVE)) |
| return EmeConfigRule::NOT_SUPPORTED; |
| media_type_codec_mask = video_codec_mask_; |
| break; |
| } |
| |
| // Look up the key system's supported codecs. |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeConfigRule::NOT_SUPPORTED; |
| } |
| SupportedCodecs key_system_codec_mask = |
| key_system_iter->second.supported_codecs; |
| #if defined(OS_ANDROID) |
| SupportedCodecs key_system_secure_codec_mask = |
| key_system_iter->second.supported_secure_codecs; |
| #endif // defined(OS_ANDROID) |
| |
| |
| // Check that the container is supported by the key system. (This check is |
| // necessary because |codecs| may be empty.) |
| SupportedCodecs container_codec_mask = |
| GetCodecMaskForContainer(container_mime_type) & media_type_codec_mask; |
| if ((key_system_codec_mask & container_codec_mask) == 0) |
| return EmeConfigRule::NOT_SUPPORTED; |
| |
| // Check that the codecs are supported by the key system and container. |
| EmeConfigRule support = EmeConfigRule::SUPPORTED; |
| for (size_t i = 0; i < codecs.size(); i++) { |
| SupportedCodecs codec = GetCodecForString(codecs[i]); |
| if ((codec & key_system_codec_mask & container_codec_mask) == 0) |
| return EmeConfigRule::NOT_SUPPORTED; |
| #if defined(OS_ANDROID) |
| // Check whether the codec supports a hardware-secure mode. The goal is to |
| // prevent mixing of non-hardware-secure codecs with hardware-secure codecs, |
| // since the mode is fixed at CDM creation. |
| // |
| // Because the check for regular codec support is early-exit, we don't have |
| // to consider codecs that are only supported in hardware-secure mode. We |
| // could do so, and make use of HW_SECURE_CODECS_REQUIRED, if it turns out |
| // that hardware-secure-only codecs actually exist and are useful. |
| if ((codec & key_system_secure_codec_mask) == 0) |
| support = EmeConfigRule::HW_SECURE_CODECS_NOT_ALLOWED; |
| #endif // defined(OS_ANDROID) |
| } |
| |
| return support; |
| } |
| |
| EmeConfigRule KeySystemsImpl::GetRobustnessConfigRule( |
| const std::string& key_system, |
| EmeMediaType media_type, |
| const std::string& requested_robustness) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| EmeRobustness robustness = ConvertRobustness(requested_robustness); |
| if (robustness == EmeRobustness::INVALID) |
| return EmeConfigRule::NOT_SUPPORTED; |
| if (robustness == EmeRobustness::EMPTY) |
| return EmeConfigRule::SUPPORTED; |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeConfigRule::NOT_SUPPORTED; |
| } |
| |
| EmeRobustness max_robustness = EmeRobustness::INVALID; |
| switch (media_type) { |
| case EmeMediaType::AUDIO: |
| max_robustness = key_system_iter->second.max_audio_robustness; |
| break; |
| case EmeMediaType::VIDEO: |
| max_robustness = key_system_iter->second.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 (key_system == kWidevineKeySystem) { |
| #if defined(OS_CHROMEOS) |
| // 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) |
| if (robustness > EmeRobustness::SW_SECURE_CRYPTO) |
| return EmeConfigRule::HW_SECURE_CODECS_REQUIRED; |
| #endif // defined(OS_CHROMEOS) |
| } |
| |
| return EmeConfigRule::SUPPORTED; |
| } |
| |
| EmeSessionTypeSupport KeySystemsImpl::GetPersistentLicenseSessionSupport( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeSessionTypeSupport::INVALID; |
| } |
| return key_system_iter->second.persistent_license_support; |
| } |
| |
| EmeSessionTypeSupport KeySystemsImpl::GetPersistentReleaseMessageSessionSupport( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeSessionTypeSupport::INVALID; |
| } |
| return key_system_iter->second.persistent_release_message_support; |
| } |
| |
| EmeFeatureSupport KeySystemsImpl::GetPersistentStateSupport( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeFeatureSupport::INVALID; |
| } |
| return key_system_iter->second.persistent_state_support; |
| } |
| |
| EmeFeatureSupport KeySystemsImpl::GetDistinctiveIdentifierSupport( |
| const std::string& key_system) const { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| |
| KeySystemInfoMap::const_iterator key_system_iter = |
| concrete_key_system_map_.find(key_system); |
| if (key_system_iter == concrete_key_system_map_.end()) { |
| NOTREACHED(); |
| return EmeFeatureSupport::INVALID; |
| } |
| return key_system_iter->second.distinctive_identifier_support; |
| } |
| |
| KeySystems* KeySystems::GetInstance() { |
| return KeySystemsImpl::GetInstance(); |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| std::string GetUnprefixedKeySystemName(const std::string& key_system) { |
| if (key_system == kClearKeyKeySystem) |
| return kUnsupportedClearKeyKeySystem; |
| |
| if (key_system == kPrefixedClearKeyKeySystem) |
| return kClearKeyKeySystem; |
| |
| return key_system; |
| } |
| |
| std::string GetPrefixedKeySystemName(const std::string& key_system) { |
| DCHECK_NE(key_system, kPrefixedClearKeyKeySystem); |
| |
| if (key_system == kClearKeyKeySystem) |
| return kPrefixedClearKeyKeySystem; |
| |
| return key_system; |
| } |
| |
| bool PrefixedIsSupportedConcreteKeySystem(const std::string& key_system) { |
| return KeySystemsImpl::GetInstance()->IsConcreteSupportedKeySystem( |
| key_system); |
| } |
| |
| bool IsSupportedKeySystemWithInitDataType(const std::string& key_system, |
| EmeInitDataType init_data_type) { |
| return KeySystemsImpl::GetInstance()->IsSupportedInitDataType(key_system, |
| init_data_type); |
| } |
| |
| bool PrefixedIsSupportedKeySystemWithMediaMimeType( |
| const std::string& mime_type, |
| const std::vector<std::string>& codecs, |
| const std::string& key_system) { |
| return KeySystemsImpl::GetInstance() |
| ->PrefixedIsSupportedKeySystemWithMediaMimeType(mime_type, codecs, |
| key_system); |
| } |
| |
| std::string GetKeySystemNameForUMA(const std::string& key_system) { |
| return KeySystemsImpl::GetInstance()->GetKeySystemNameForUMA(key_system); |
| } |
| |
| bool CanUseAesDecryptor(const std::string& concrete_key_system) { |
| return KeySystemsImpl::GetInstance()->UseAesDecryptor(concrete_key_system); |
| } |
| |
| #if defined(ENABLE_PEPPER_CDMS) |
| std::string GetPepperType(const std::string& concrete_key_system) { |
| return KeySystemsImpl::GetInstance()->GetPepperType(concrete_key_system); |
| } |
| #endif |
| |
| // These two functions are for testing purpose only. The declaration in the |
| // header file is guarded by "#if defined(UNIT_TEST)" so that they can be used |
| // by tests but not non-test code. However, this .cc file is compiled as part of |
| // "media" where "UNIT_TEST" is not defined. So we need to specify |
| // "MEDIA_EXPORT" here again so that they are visible to tests. |
| |
| MEDIA_EXPORT void AddContainerMask(const std::string& container, uint32 mask) { |
| KeySystemsImpl::GetInstance()->AddContainerMask(container, mask); |
| } |
| |
| MEDIA_EXPORT void AddCodecMask( |
| EmeMediaType media_type, |
| const std::string& codec, |
| uint32 mask) { |
| KeySystemsImpl::GetInstance()->AddCodecMask(media_type, codec, mask); |
| } |
| |
| } // namespace media |