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      1 /*--------------------------------------------------------------------------
      2 Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
      3 
      4 Redistribution and use in source and binary forms, with or without
      5 modification, are permitted provided that the following conditions are met:
      6     * Redistributions of source code must retain the above copyright
      7       notice, this list of conditions and the following disclaimer.
      8     * Redistributions in binary form must reproduce the above copyright
      9       notice, this list of conditions and the following disclaimer in the
     10       documentation and/or other materials provided with the distribution.
     11     * Neither the name of The Linux Foundation nor
     12       the names of its contributors may be used to endorse or promote
     13       products derived from this software without specific prior written
     14       permission.
     15 
     16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18 IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     20 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     21 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 --------------------------------------------------------------------------*/
     28 
     29 #include "DivXDrmDecrypt.h"
     30 #include <dlfcn.h>  // for dlopen/dlclose
     31 
     32 //#define LOG_NDEBUG 0
     33 #define LOG_TAG "DivXDrmDecrypt"
     34 #ifdef _ANDROID_
     35 #include <utils/Log.h>
     36 #else
     37 #include <stdio.h>
     38 #define ALOGE(fmt, args...) fprintf(stderr, fmt, ##args)
     39 #endif /* _ANDROID_ */
     40 
     41 static const char* DIVX_DRM_SHIM_LIB = "libSHIMDivxDrm.so";
     42 
     43 void* getDecryptHandle()
     44 {
     45     static void* decryptLib = NULL;
     46     static bool  decryptLibOpened = false;
     47 
     48     if (decryptLibOpened) {
     49         return decryptLib;
     50     }
     51 
     52     decryptLib = ::dlopen(DIVX_DRM_SHIM_LIB, RTLD_NOW);
     53     decryptLibOpened = true;
     54 
     55     if (decryptLib == NULL) {
     56         ALOGE("Failed to open DIVX_DRM_SHIM_LIB \n");
     57     }
     58 
     59     return decryptLib;
     60 }
     61 
     62 DivXDrmDecryptFactory DrmDecryptFactoryFunction()
     63 {
     64     static DivXDrmDecryptFactory drmDecryptFactoryFunction = NULL;
     65     static bool alreadyTriedToFindFactoryFunction = false;
     66 
     67     if (alreadyTriedToFindFactoryFunction) {
     68         return drmDecryptFactoryFunction;
     69     }
     70 
     71     void *pDecryptLib = getDecryptHandle();
     72 
     73     if (pDecryptLib == NULL) {
     74         return NULL;
     75     }
     76 
     77     drmDecryptFactoryFunction = (DivXDrmDecryptFactory) dlsym(pDecryptLib, MEDIA_CREATE_DIVX_DRM_DECRYPT);
     78     alreadyTriedToFindFactoryFunction = true;
     79 
     80     if (!drmDecryptFactoryFunction) {
     81         ALOGE(" dlsym for DrmDecrypt factory function failed \n");
     82     }
     83 
     84     return drmDecryptFactoryFunction;
     85 }
     86 
     87 
     88 
     89 DivXDrmDecrypt* DivXDrmDecrypt::Create()
     90 {
     91     DivXDrmDecryptFactory drmCreateFunc = DrmDecryptFactoryFunction();
     92 
     93     if ( drmCreateFunc == NULL ) {
     94         return NULL;
     95     }
     96 
     97     DivXDrmDecrypt* decrypt = drmCreateFunc();
     98 
     99     if ( decrypt == NULL ) {
    100         ALOGE(" failed to instantiate DrmDecoder \n");
    101     }
    102 
    103     return decrypt;
    104 }
    105 
    106