text: // 
  // Notice Regarding Standards.  AMD does not provide a license or sublicense to
  // any Intellectual Property Rights relating to any standards, including but not
  // limited to any audio and/or video codec technologies such as MPEG-2, MPEG-4;
  // AVC/H.264; HEVC/H.265; AAC decode/FFMPEG; AAC encode/FFMPEG; VC-1; and MP3
  // (collectively, the "Media Technologies"). For clarity, you will pay any
  // royalties due for such third party technologies, which may include the Media
  // Technologies that are owed as a result of AMD providing the Software to you.
  // 
  // MIT license 
  // 
  // Copyright (c) 2018 Advanced Micro Devices, Inc. All rights reserved.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #ifndef AMF_DataStreamFile_h
  #define AMF_DataStreamFile_h
  
  #pragma once
  
  #include "DataStream.h"
  #include "InterfaceImpl.h"
  #include "AMFSTL.h"
  #include <string>
  
  namespace amf
  {
      class AMFDataStreamFileImpl : public AMFInterfaceImpl<AMFDataStream>
      {
      public:
          AMFDataStreamFileImpl();
          virtual ~AMFDataStreamFileImpl();
          // interface
          virtual AMF_RESULT AMF_STD_CALL Close();
          virtual AMF_RESULT AMF_STD_CALL Read(void* pData, amf_size iSize, amf_size* pRead);
          virtual AMF_RESULT AMF_STD_CALL Write(const void* pData, amf_size iSize, amf_size* pWritten);
          virtual AMF_RESULT AMF_STD_CALL Seek(AMF_SEEK_ORIGIN eOrigin, amf_int64 iPosition, amf_int64* pNewPosition);
          virtual AMF_RESULT AMF_STD_CALL GetPosition(amf_int64* pPosition);
          virtual AMF_RESULT AMF_STD_CALL GetSize(amf_int64* pSize);
          virtual bool       AMF_STD_CALL IsSeekable();
  
          // local
          // aways pass full URL just in case
          virtual AMF_RESULT AMF_STD_CALL Open(const wchar_t* pFilePath, AMF_STREAM_OPEN eOpenType, AMF_FILE_SHARE eShareType);
      protected:
          int m_iFileDescriptor;
          amf_wstring m_Path;
      };
  } //namespace amf
  #endif // AMF_DataStreamFile_h