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      1 /*
      2  * Copyright (C) 2012 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 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "HDCP"
     19 #include <utils/Log.h>
     20 
     21 #include "HDCP.h"
     22 
     23 #include <media/stagefright/foundation/ADebug.h>
     24 
     25 #include <dlfcn.h>
     26 
     27 namespace android {
     28 
     29 HDCP::HDCP(bool createEncryptionModule)
     30     : mIsEncryptionModule(createEncryptionModule),
     31       mLibHandle(NULL),
     32       mHDCPModule(NULL) {
     33     mLibHandle = dlopen("libstagefright_hdcp.so", RTLD_NOW);
     34 
     35     if (mLibHandle == NULL) {
     36         ALOGE("Unable to locate libstagefright_hdcp.so");
     37         return;
     38     }
     39 
     40     typedef HDCPModule *(*CreateHDCPModuleFunc)(
     41             void *, HDCPModule::ObserverFunc);
     42 
     43     CreateHDCPModuleFunc createHDCPModule =
     44         mIsEncryptionModule
     45             ? (CreateHDCPModuleFunc)dlsym(mLibHandle, "createHDCPModule")
     46             : (CreateHDCPModuleFunc)dlsym(
     47                     mLibHandle, "createHDCPModuleForDecryption");
     48 
     49     if (createHDCPModule == NULL) {
     50         ALOGE("Unable to find symbol 'createHDCPModule'.");
     51     } else if ((mHDCPModule = createHDCPModule(
     52                     this, &HDCP::ObserveWrapper)) == NULL) {
     53         ALOGE("createHDCPModule failed.");
     54     }
     55 }
     56 
     57 HDCP::~HDCP() {
     58     Mutex::Autolock autoLock(mLock);
     59 
     60     if (mHDCPModule != NULL) {
     61         delete mHDCPModule;
     62         mHDCPModule = NULL;
     63     }
     64 
     65     if (mLibHandle != NULL) {
     66         dlclose(mLibHandle);
     67         mLibHandle = NULL;
     68     }
     69 }
     70 
     71 status_t HDCP::setObserver(const sp<IHDCPObserver> &observer) {
     72     Mutex::Autolock autoLock(mLock);
     73 
     74     if (mHDCPModule == NULL) {
     75         return NO_INIT;
     76     }
     77 
     78     mObserver = observer;
     79 
     80     return OK;
     81 }
     82 
     83 status_t HDCP::initAsync(const char *host, unsigned port) {
     84     Mutex::Autolock autoLock(mLock);
     85 
     86     if (mHDCPModule == NULL) {
     87         return NO_INIT;
     88     }
     89 
     90     return mHDCPModule->initAsync(host, port);
     91 }
     92 
     93 status_t HDCP::shutdownAsync() {
     94     Mutex::Autolock autoLock(mLock);
     95 
     96     if (mHDCPModule == NULL) {
     97         return NO_INIT;
     98     }
     99 
    100     return mHDCPModule->shutdownAsync();
    101 }
    102 
    103 uint32_t HDCP::getCaps() {
    104     Mutex::Autolock autoLock(mLock);
    105 
    106     if (mHDCPModule == NULL) {
    107         return NO_INIT;
    108     }
    109 
    110     // TO-DO:
    111     // Only support HDCP_CAPS_ENCRYPT (byte-array to byte-array) for now.
    112     // use mHDCPModule->getCaps() when the HDCP libraries get updated.
    113     //return mHDCPModule->getCaps();
    114     return HDCPModule::HDCP_CAPS_ENCRYPT;
    115 }
    116 
    117 status_t HDCP::encrypt(
    118         const void *inData, size_t size, uint32_t streamCTR,
    119         uint64_t *outInputCTR, void *outData) {
    120     Mutex::Autolock autoLock(mLock);
    121 
    122     CHECK(mIsEncryptionModule);
    123 
    124     if (mHDCPModule == NULL) {
    125         *outInputCTR = 0;
    126 
    127         return NO_INIT;
    128     }
    129 
    130     return mHDCPModule->encrypt(inData, size, streamCTR, outInputCTR, outData);
    131 }
    132 
    133 status_t HDCP::encryptNative(
    134         const sp<GraphicBuffer> &graphicBuffer,
    135         size_t offset, size_t size, uint32_t streamCTR,
    136         uint64_t *outInputCTR, void *outData) {
    137     Mutex::Autolock autoLock(mLock);
    138 
    139     CHECK(mIsEncryptionModule);
    140 
    141     if (mHDCPModule == NULL) {
    142         *outInputCTR = 0;
    143 
    144         return NO_INIT;
    145     }
    146 
    147     return mHDCPModule->encryptNative(graphicBuffer->handle,
    148                     offset, size, streamCTR, outInputCTR, outData);
    149 }
    150 
    151 status_t HDCP::decrypt(
    152         const void *inData, size_t size,
    153         uint32_t streamCTR, uint64_t outInputCTR, void *outData) {
    154     Mutex::Autolock autoLock(mLock);
    155 
    156     CHECK(!mIsEncryptionModule);
    157 
    158     if (mHDCPModule == NULL) {
    159         return NO_INIT;
    160     }
    161 
    162     return mHDCPModule->decrypt(inData, size, streamCTR, outInputCTR, outData);
    163 }
    164 
    165 // static
    166 void HDCP::ObserveWrapper(void *me, int msg, int ext1, int ext2) {
    167     static_cast<HDCP *>(me)->observe(msg, ext1, ext2);
    168 }
    169 
    170 void HDCP::observe(int msg, int ext1, int ext2) {
    171     Mutex::Autolock autoLock(mLock);
    172 
    173     if (mObserver != NULL) {
    174         mObserver->notify(msg, ext1, ext2, NULL /* obj */);
    175     }
    176 }
    177 
    178 }  // namespace android
    179 
    180