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#include "DivXDrmDecrypt.h"
#include <dlfcn.h>  // for dlopen/dlclose

//#define LOG_NDEBUG 0
#define LOG_TAG "DivXDrmDecrypt"
#ifdef _ANDROID_
#include <utils/Log.h>
#else
#include <stdio.h>
#define ALOGE(fmt, args...) fprintf(stderr, fmt, ##args)
#endif /* _ANDROID_ */

static const char* DIVX_DRM_SHIM_LIB = "libSHIMDivxDrm.so";

void* getDecryptHandle()
{
    static void* decryptLib = NULL;
    static bool  decryptLibOpened = false;

    if (decryptLibOpened) {
        return decryptLib;
    }

    decryptLib = ::dlopen(DIVX_DRM_SHIM_LIB, RTLD_NOW);
    decryptLibOpened = true;

    if (decryptLib == NULL) {
        ALOGE("Failed to open DIVX_DRM_SHIM_LIB \n");
    }

    return decryptLib;
}

DivXDrmDecryptFactory DrmDecryptFactoryFunction()
{
    static DivXDrmDecryptFactory drmDecryptFactoryFunction = NULL;
    static bool alreadyTriedToFindFactoryFunction = false;

    if (alreadyTriedToFindFactoryFunction) {
        return drmDecryptFactoryFunction;
    }

    void *pDecryptLib = getDecryptHandle();

    if (pDecryptLib == NULL) {
        return NULL;
    }

    drmDecryptFactoryFunction = (DivXDrmDecryptFactory) dlsym(pDecryptLib, MEDIA_CREATE_DIVX_DRM_DECRYPT);
    alreadyTriedToFindFactoryFunction = true;

    if (!drmDecryptFactoryFunction) {
        ALOGE(" dlsym for DrmDecrypt factory function failed \n");
    }

    return drmDecryptFactoryFunction;
}



DivXDrmDecrypt* DivXDrmDecrypt::Create()
{
    DivXDrmDecryptFactory drmCreateFunc = DrmDecryptFactoryFunction();

    if ( drmCreateFunc == NULL ) {
        return NULL;
    }

    DivXDrmDecrypt* decrypt = drmCreateFunc();

    if ( decrypt == NULL ) {
        ALOGE(" failed to instantiate DrmDecoder \n");
    }

    return decrypt;
}