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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 NUPLAYER_DRM_H_
     18 #define NUPLAYER_DRM_H_
     19 
     20 #include <binder/Parcel.h>
     21 #include <media/ICrypto.h>
     22 #include <media/IDrm.h>
     23 #include <media/stagefright/MetaData.h> // for CryptInfo
     24 
     25 
     26 namespace android {
     27 
     28     struct DrmUUID {
     29         static const int UUID_SIZE = 16;
     30 
     31         DrmUUID() {
     32             memset(this->uuid, 0, sizeof(uuid));
     33         }
     34 
     35         // to allow defining Vector/KeyedVector of UUID type
     36         DrmUUID(const DrmUUID &a) {
     37             memcpy(this->uuid, a.uuid, sizeof(uuid));
     38         }
     39 
     40         // to allow defining Vector/KeyedVector of UUID type
     41         DrmUUID(const uint8_t uuid_in[UUID_SIZE]) {
     42             memcpy(this->uuid, uuid_in, sizeof(uuid));
     43         }
     44 
     45         const uint8_t *ptr() const {
     46             return uuid;
     47         }
     48 
     49         String8 toHexString() const {
     50             return arrayToHex(uuid, UUID_SIZE);
     51         }
     52 
     53         static String8 toHexString(const uint8_t uuid_in[UUID_SIZE]) {
     54             return arrayToHex(uuid_in, UUID_SIZE);
     55         }
     56 
     57         static String8 arrayToHex(const uint8_t *array, int bytes) {
     58             String8 result;
     59             for (int i = 0; i < bytes; i++) {
     60                 result.appendFormat("%02x", array[i]);
     61             }
     62 
     63             return result;
     64         }
     65 
     66     protected:
     67         uint8_t uuid[UUID_SIZE];
     68     };
     69 
     70 
     71     struct NuPlayerDrm {
     72 
     73         // static helpers - internal
     74 
     75     protected:
     76         static sp<IDrm> CreateDrm(status_t *pstatus);
     77         static sp<ICrypto> createCrypto(status_t *pstatus);
     78         static Vector<DrmUUID> parsePSSH(const void *pssh, size_t psshsize);
     79         static Vector<DrmUUID> getSupportedDrmSchemes(const void *pssh, size_t psshsize);
     80 
     81         // static helpers - public
     82 
     83     public:
     84         static sp<ICrypto> createCryptoAndPlugin(const uint8_t uuid[16],
     85                 const Vector<uint8_t> &drmSessionId, status_t &status);
     86         // Parcel has only private copy constructor so passing it in rather than returning
     87         static void retrieveDrmInfo(const void *pssh, size_t psshsize, Parcel *parcel);
     88 
     89         ////////////////////////////////////////////////////////////////////////////////////////////
     90         /// Helpers for NuPlayerDecoder
     91         ////////////////////////////////////////////////////////////////////////////////////////////
     92 
     93         static const uint8_t kBlockSize = 16; // AES_BLOCK_SIZE
     94 
     95         struct CryptoInfo {
     96             int numSubSamples;
     97             uint8_t key[kBlockSize];
     98             uint8_t iv[kBlockSize];
     99             CryptoPlugin::Mode mode;
    100             CryptoPlugin::Pattern pattern;
    101             CryptoPlugin::SubSample *subSamples;
    102         };
    103 
    104         static CryptoInfo *makeCryptoInfo(
    105                 int numSubSamples,
    106                 uint8_t key[kBlockSize],
    107                 uint8_t iv[kBlockSize],
    108                 CryptoPlugin::Mode mode,
    109                 size_t *clearbytes,
    110                 size_t *encryptedbytes);
    111 
    112         static CryptoInfo *getSampleCryptoInfo(MetaDataBase &meta);
    113 
    114     };  // NuPlayerDrm
    115 
    116 }   // android
    117 
    118 #endif     //NUPLAYER_DRM_H_
    119