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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef CLEARKEY_CAS_PLUGIN_H_
     18 #define CLEARKEY_CAS_PLUGIN_H_
     19 
     20 #include <media/cas/CasAPI.h>
     21 #include <media/cas/DescramblerAPI.h>
     22 #include <utils/Mutex.h>
     23 #include <utils/StrongPointer.h>
     24 
     25 extern "C" {
     26       android::CasFactory *createCasFactory();
     27       android::DescramblerFactory *createDescramblerFactory();
     28 }
     29 
     30 namespace android {
     31 namespace clearkeycas {
     32 
     33 class KeyFetcher;
     34 class ClearKeyCasSession;
     35 
     36 class ClearKeyCasFactory : public CasFactory {
     37 public:
     38     ClearKeyCasFactory() {}
     39     virtual ~ClearKeyCasFactory() {}
     40 
     41     virtual bool isSystemIdSupported(
     42             int32_t CA_system_id) const override;
     43     virtual status_t queryPlugins(
     44             std::vector<CasPluginDescriptor> *descriptors) const override;
     45     virtual status_t createPlugin(
     46             int32_t CA_system_id,
     47             void *appData,
     48             CasPluginCallback callback,
     49             CasPlugin **plugin) override;
     50 };
     51 
     52 class ClearKeyDescramblerFactory : public DescramblerFactory {
     53 public:
     54     ClearKeyDescramblerFactory() {}
     55     virtual ~ClearKeyDescramblerFactory() {}
     56 
     57     virtual bool isSystemIdSupported(
     58             int32_t CA_system_id) const override;
     59     virtual status_t createPlugin(
     60             int32_t CA_system_id, DescramblerPlugin **plugin) override;
     61 };
     62 
     63 class ClearKeyCasPlugin : public CasPlugin {
     64 public:
     65     ClearKeyCasPlugin(void *appData, CasPluginCallback callback);
     66     virtual ~ClearKeyCasPlugin();
     67 
     68     virtual status_t setPrivateData(
     69             const CasData &data) override;
     70 
     71     virtual status_t openSession(CasSessionId *sessionId) override;
     72 
     73     virtual status_t closeSession(
     74             const CasSessionId &sessionId) override;
     75 
     76     virtual status_t setSessionPrivateData(
     77             const CasSessionId &sessionId,
     78             const CasData &data) override;
     79 
     80     virtual status_t processEcm(
     81             const CasSessionId &sessionId, const CasEcm &ecm) override;
     82 
     83     virtual status_t processEmm(const CasEmm &emm) override;
     84 
     85     virtual status_t sendEvent(
     86             int32_t event, int32_t arg, const CasData &eventData) override;
     87 
     88     virtual status_t provision(const String8 &str) override;
     89 
     90     virtual status_t refreshEntitlements(
     91             int32_t refreshType, const CasData &refreshData) override;
     92 
     93 private:
     94     Mutex mKeyFetcherLock;
     95     std::unique_ptr<KeyFetcher> mKeyFetcher;
     96     CasPluginCallback mCallback;
     97     void* mAppData;
     98 };
     99 
    100 class ClearKeyDescramblerPlugin : public DescramblerPlugin {
    101 public:
    102     ClearKeyDescramblerPlugin() {}
    103     virtual ~ClearKeyDescramblerPlugin() {};
    104 
    105     virtual bool requiresSecureDecoderComponent(
    106             const char *mime) const override;
    107 
    108     virtual status_t setMediaCasSession(
    109             const CasSessionId &sessionId) override;
    110 
    111     virtual ssize_t descramble(
    112             bool secure,
    113             ScramblingControl scramblingControl,
    114             size_t numSubSamples,
    115             const SubSample *subSamples,
    116             const void *srcPtr,
    117             int32_t srcOffset,
    118             void *dstPtr,
    119             int32_t dstOffset,
    120             AString *errorDetailMsg) override;
    121 
    122 private:
    123     sp<ClearKeyCasSession> mCASSession;
    124 
    125     String8 subSamplesToString(
    126             SubSample const *subSamples,
    127             size_t numSubSamples) const;
    128     String8 arrayToString(uint8_t const *array, size_t len) const;
    129 };
    130 
    131 } // namespace clearkeycas
    132 } // namespace android
    133 
    134 #endif // CLEARKEY_CAS_PLUGIN_H_
    135