text: /* ****************************************************************************** *\
  
  Copyright (C) 2012-2018 Intel Corporation.  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  - Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
  - Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
  - Neither the name of Intel Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION "AS IS" AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL INTEL CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  File Name: mfx_dispatcher.cpp
  
  \* ****************************************************************************** */
  
  #include "mfx_dispatcher.h"
  #include "mfx_dispatcher_log.h"
  #include "mfx_load_dll.h"
  
  #include <assert.h>
  
  #include <string.h>
  #if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
      #include <windows.h>
      #pragma warning(disable:4355)
  #else
      #include <dlfcn.h>
      #include <iostream>
  #endif // defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
  
  
  MFX_DISP_HANDLE::MFX_DISP_HANDLE(const mfxVersion requiredVersion) :
      _mfxSession()
      ,apiVersion(requiredVersion)
      ,pluginFactory((mfxSession)this)
  {
      actualApiVersion.Version = 0;
      implType = MFX_LIB_SOFTWARE;
      impl = MFX_IMPL_SOFTWARE;
      loadStatus = MFX_ERR_NOT_FOUND;
      dispVersion.Major = MFX_DISPATCHER_VERSION_MAJOR;
      dispVersion.Minor = MFX_DISPATCHER_VERSION_MINOR;
      storageID = 0;
      implInterface = MFX_IMPL_HARDWARE_ANY;
  
      hModule = (mfxModuleHandle) 0;
  
  } // MFX_DISP_HANDLE::MFX_DISP_HANDLE(const mfxVersion requiredVersion)
  
  MFX_DISP_HANDLE::~MFX_DISP_HANDLE(void)
  {
      Close();
  
  } // MFX_DISP_HANDLE::~MFX_DISP_HANDLE(void)
  
  mfxStatus MFX_DISP_HANDLE::Close(void)
  {
      mfxStatus mfxRes;
  
      mfxRes = UnLoadSelectedDLL();
  
      // the library wasn't unloaded
      if (MFX_ERR_NONE == mfxRes)
      {
          implType = MFX_LIB_SOFTWARE;
          impl = MFX_IMPL_SOFTWARE;
          loadStatus = MFX_ERR_NOT_FOUND;
          dispVersion.Major = MFX_DISPATCHER_VERSION_MAJOR;
          dispVersion.Minor = MFX_DISPATCHER_VERSION_MINOR;
          *static_cast<_mfxSession*>(this) = _mfxSession();
          hModule = (mfxModuleHandle) 0;
      }
  
      return mfxRes;
  
  } // mfxStatus MFX_DISP_HANDLE::Close(void)
  
  mfxStatus MFX_DISP_HANDLE::LoadSelectedDLL(const msdk_disp_char *pPath, eMfxImplType reqImplType,
                                             mfxIMPL reqImpl, mfxIMPL reqImplInterface, mfxInitParam &par)
  {
      mfxStatus mfxRes = MFX_ERR_NONE;
  
      // check error(s)
      if ((MFX_LIB_SOFTWARE != reqImplType) &&
          (MFX_LIB_HARDWARE != reqImplType))
      {
          DISPATCHER_LOG_ERROR((("implType == %s, should be either MFX_LIB_SOFTWARE ot MFX_LIB_HARDWARE\n"), DispatcherLog_GetMFXImplString(reqImplType).c_str()));
          loadStatus = MFX_ERR_ABORTED;
          return loadStatus;
      }
      // only exact types of implementation is allowed
      if (!(reqImpl & MFX_IMPL_AUDIO) &&
          (MFX_IMPL_SOFTWARE != reqImpl) &&
          (MFX_IMPL_HARDWARE != reqImpl) &&
          (MFX_IMPL_HARDWARE2 != reqImpl) &&
          (MFX_IMPL_HARDWARE3 != reqImpl) &&
          (MFX_IMPL_HARDWARE4 != reqImpl))
      {
          DISPATCHER_LOG_ERROR((("invalid implementation impl == %s\n"), DispatcherLog_GetMFXImplString(impl).c_str()));
          loadStatus = MFX_ERR_ABORTED;
          return loadStatus;
      }
      // only mfxExtThreadsParam is allowed
      if (par.NumExtParam)
      {
          if ((par.NumExtParam > 1) || !par.ExtParam)
          {
              loadStatus = MFX_ERR_ABORTED;
              return loadStatus;
          }
          if ((par.ExtParam[0]->BufferId != MFX_EXTBUFF_THREADS_PARAM) ||
              (par.ExtParam[0]->BufferSz != sizeof(mfxExtThreadsParam)))
          {
              loadStatus = MFX_ERR_ABORTED;
              return loadStatus;
          }
      }
  
      // close the handle before initialization
      Close();
  
      // save the library's type
      this->implType = reqImplType;
      this->impl = reqImpl;
      this->implInterface = reqImplInterface;
  
      {
          assert(hModule == (mfxModuleHandle)0);
          DISPATCHER_LOG_BLOCK(("invoking LoadLibrary(%S)\n", MSDK2WIDE(pPath)));
  
          // load the DLL into the memory
          hModule = MFX::mfx_dll_load(pPath);
  
          if (hModule)
          {
              int i;
  
              DISPATCHER_LOG_OPERATION({
                  msdk_disp_char modulePath[1024];
                  GetModuleFileNameW((HMODULE)hModule, modulePath, sizeof(modulePath)/sizeof(modulePath[0]));
                  DISPATCHER_LOG_INFO((("loaded module %S\n"), MSDK2WIDE(modulePath)))
              });
  
              if (impl & MFX_IMPL_AUDIO)
              {
                  // load audio functions: pointers to exposed functions
                  for (i = 0; i < eAudioFuncTotal; i += 1)
                  {
                      // construct correct name of the function - remove "_a" postfix
  
                      mfxFunctionPointer pProc = (mfxFunctionPointer) MFX::mfx_dll_get_addr(hModule, APIAudioFunc[i].pName);
      #ifdef ANDROID
                      // on Android very first call to dlsym may fail
                      if (!pProc) pProc = (mfxFunctionPointer) MFX::mfx_dll_get_addr(hModule, APIAudioFunc[i].pName);
      #endif
                      if (pProc)
                      {
                          // function exists in the library,
                          // save the pointer.
                          callAudioTable[i] = pProc;
                      }
                      else
                      {
                          // The library doesn't contain the function
                          DISPATCHER_LOG_WRN((("Can't find API function \"%s\"\n"), APIAudioFunc[i].pName));
                          if (apiVersion.Version >= APIAudioFunc[i].apiVersion.Version)
                          {
                              DISPATCHER_LOG_ERROR((("\"%s\" is required for API %u.%u\n"), APIAudioFunc[i].pName, apiVersion.Major, apiVersion.Minor));
                              mfxRes = MFX_ERR_UNSUPPORTED;
                              break;
                          }
                      }
                  }
              }
              else
              {
                  // load video functions: pointers to exposed functions
                  for (i = 0; i < eVideoFuncTotal; i += 1)
                  {
                      mfxFunctionPointer pProc = (mfxFunctionPointer) MFX::mfx_dll_get_addr(hModule, APIFunc[i].pName);
      #ifdef ANDROID
                      // on Android very first call to dlsym may fail
                      if (!pProc) pProc = (mfxFunctionPointer) MFX::mfx_dll_get_addr(hModule, APIFunc[i].pName);
      #endif
                      if (pProc)
                      {
                          // function exists in the library,
                          // save the pointer.
                          callTable[i] = pProc;
                      }
                      else
                      {
                          // The library doesn't contain the function
                          DISPATCHER_LOG_WRN((("Can't find API function \"%s\"\n"), APIFunc[i].pName));
                          if (apiVersion.Version >= APIFunc[i].apiVersion.Version)
                          {
                              DISPATCHER_LOG_ERROR((("\"%s\" is required for API %u.%u\n"), APIFunc[i].pName, apiVersion.Major, apiVersion.Minor));
                              mfxRes = MFX_ERR_UNSUPPORTED;
                              break;
                          }
                      }
                  }
              }
          }
          else
          {
  #if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
              DISPATCHER_LOG_WRN((("can't find DLL: GetLastErr()=0x%x\n"), GetLastError()))
  #else
              DISPATCHER_LOG_WRN((("can't find DLL: dlerror() = \"%s\"\n"), dlerror()));
  #endif
              mfxRes = MFX_ERR_UNSUPPORTED;
          }
      }
  
      // initialize the loaded DLL
      if (MFX_ERR_NONE == mfxRes)
      {
          mfxVersion version(apiVersion);
  
          /* check whether it is audio session or video */
          mfxFunctionPointer *actualTable = (impl & MFX_IMPL_AUDIO) ? callAudioTable : callTable;
  
          // Call old-style MFXInit init for older libraries and audio library
          bool callOldInit = (impl & MFX_IMPL_AUDIO) || !actualTable[eMFXInitEx]; // if true call eMFXInit, if false - eMFXInitEx
          int tableIndex = (callOldInit) ? eMFXInit : eMFXInitEx;
  
          mfxFunctionPointer pFunc = actualTable[tableIndex];
  
          {
              if (callOldInit)
              {
                  DISPATCHER_LOG_BLOCK(("MFXInit(%s,ver=%u.%u,session=0x%p)\n"
                                       , DispatcherLog_GetMFXImplString(impl | implInterface).c_str()
                                       , apiVersion.Major
                                       , apiVersion.Minor
                                       , &session));
  
                  mfxRes = (*(mfxStatus(MFX_CDECL *) (mfxIMPL, mfxVersion *, mfxSession *)) pFunc) (impl | implInterface, &version, &session);
              }
              else
              {
                  DISPATCHER_LOG_BLOCK(("MFXInitEx(%s,ver=%u.%u,ExtThreads=%d,session=0x%p)\n"
                                       , DispatcherLog_GetMFXImplString(impl | implInterface).c_str()
                                       , apiVersion.Major
                                       , apiVersion.Minor
                                       , par.ExternalThreads
                                       , &session));
  
                  mfxInitParam initPar = par;
                  // adjusting user parameters
                  initPar.Implementation = impl | implInterface;
                  initPar.Version = version;
                  mfxRes = (*(mfxStatus(MFX_CDECL *) (mfxInitParam, mfxSession *)) pFunc) (initPar, &session);
              }
          }
  
          if (MFX_ERR_NONE != mfxRes)
          {
              DISPATCHER_LOG_WRN((("library can't be load. MFXInit returned %s \n"), DispatcherLog_GetMFXStatusString(mfxRes)))
          }
          else
          {
              mfxRes = MFXQueryVersion((mfxSession) this, &actualApiVersion);
  
              if (MFX_ERR_NONE != mfxRes)
              {
                  DISPATCHER_LOG_ERROR((("MFXQueryVersion returned: %d, skiped this library\n"), mfxRes))
              }
              else
              {
                  DISPATCHER_LOG_INFO((("MFXQueryVersion returned API: %d.%d\n"), actualApiVersion.Major, actualApiVersion.Minor))
                  //special hook for applications that uses sink api to get loaded library path
                  DISPATCHER_LOG_LIBRARY(("%p" , hModule));
                  DISPATCHER_LOG_INFO(("library loaded succesfully\n"))
              }
          }
      }
  
      loadStatus = mfxRes;
      return mfxRes;
  
  } // mfxStatus MFX_DISP_HANDLE::LoadSelectedDLL(const msdk_disp_char *pPath, eMfxImplType implType, mfxIMPL impl)
  
  mfxStatus MFX_DISP_HANDLE::UnLoadSelectedDLL(void)
  {
      mfxStatus mfxRes = MFX_ERR_NONE;
  
      //unregistered plugins if any
      pluginFactory.Close();
  
      // close the loaded DLL
      if (session)
      {
          /* check whether it is audio session or video */
          int tableIndex = eMFXClose;
          mfxFunctionPointer pFunc;
          if (impl & MFX_IMPL_AUDIO)
          {
              pFunc = callAudioTable[tableIndex];
          }
          else
          {
              pFunc = callTable[tableIndex];
          }
  
          mfxRes = (*(mfxStatus (MFX_CDECL *) (mfxSession)) pFunc) (session);
          if (MFX_ERR_NONE == mfxRes)
          {
              session = (mfxSession) 0;
          }
  
          DISPATCHER_LOG_INFO((("MFXClose(0x%x) returned %d\n"), session, mfxRes));
          // actually, the return value is required to pass outside only.
      }
  
      // it is possible, that there is an active child session.
      // can't unload library in that case.
      if ((MFX_ERR_UNDEFINED_BEHAVIOR != mfxRes) &&
          (hModule))
      {
          // unload the library.
          if (!MFX::mfx_dll_free(hModule))
          {
              mfxRes = MFX_ERR_UNDEFINED_BEHAVIOR;
          }
          hModule = (mfxModuleHandle) 0;
      }
  
      return mfxRes;
  
  } // mfxStatus MFX_DISP_HANDLE::UnLoadSelectedDLL(void)