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 KEY_FETCHER_H_ 18 #define KEY_FETCHER_H_ 19 20 #include <vector> 21 22 #include <media/stagefright/foundation/ABuffer.h> 23 #include <utils/Errors.h> 24 25 using namespace std; 26 27 namespace android { 28 namespace clearkeycas { 29 30 // Interface for classes which extract the content key from an Ecm. 31 class KeyFetcher { 32 public: 33 struct KeyInfo { 34 sp<ABuffer> key_bytes; 35 int key_id; 36 }; 37 KeyFetcher()38 KeyFetcher() {} ~KeyFetcher()39 virtual ~KeyFetcher() {} 40 41 // Initializes resources set in subclass-specific calls. This must be called 42 // before threads are started. 43 virtual status_t Init() = 0; 44 45 // Obtains content key(s) based on contents of |ecm|. |asset_id| is the 46 // internal id of the asset, |keys| is a vector containing instances of a 47 // class containing a content key and an id. |asset_id| and |keys| are 48 // owned by the caller and must be non-null. 49 virtual status_t ObtainKey(const sp<ABuffer>& ecm, 50 uint64_t* asset_id, vector<KeyInfo>* keys) = 0; 51 }; 52 53 } // namespace clearkeycas 54 } // namespace android 55 56 #endif // KEY_FETCHER_H_ 57