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.
  //
  #pragma once
  
  #include "public/include/components/Component.h"
  #include "public/include/components/FFMPEGAudioConverter.h"
  #include "public/common/PropertyStorageExImpl.h"
  #include "public/include/core/Context.h"
  
  extern "C"
  {
  #if defined(_MSC_VER)
  #pragma warning(push)
  #pragma warning(disable:4244)
  #endif
  
      #include "libavformat/avformat.h"
      #include "libavcodec/avcodec.h"
      #include "libavresample/avresample.h"
      #include "libavutil/opt.h"
  
  #if defined(_MSC_VER)
  #pragma warning(pop)
  #endif
  }
  
  
  namespace amf
  {
  
      //-------------------------------------------------------------------------------------------------
  
      class AMFAudioConverterFFMPEGImpl : 
          public AMFInterfaceBase,
          public AMFPropertyStorageExImpl<AMFComponent>
      {
  
      public:
          // interface access
          AMF_BEGIN_INTERFACE_MAP
              AMF_INTERFACE_MULTI_ENTRY(AMFComponent)
              AMF_INTERFACE_CHAIN_ENTRY(AMFPropertyStorageExImpl<AMFComponent>)
          AMF_END_INTERFACE_MAP
  
  
          AMFAudioConverterFFMPEGImpl(AMFContext* pContext);
          virtual ~AMFAudioConverterFFMPEGImpl();
  
          // AMFComponent interface
          virtual AMF_RESULT  AMF_STD_CALL  Init(AMF_SURFACE_FORMAT format, amf_int32 width, amf_int32 height);
          virtual AMF_RESULT  AMF_STD_CALL  ReInit(amf_int32 width, amf_int32 height);
          virtual AMF_RESULT  AMF_STD_CALL  Terminate();
          virtual AMF_RESULT  AMF_STD_CALL  Drain();
          virtual AMF_RESULT  AMF_STD_CALL  Flush();
  
          virtual AMF_RESULT  AMF_STD_CALL  SubmitInput(AMFData* pData);
          virtual AMF_RESULT  AMF_STD_CALL  QueryOutput(AMFData** ppData);
          virtual AMFContext* AMF_STD_CALL  GetContext()                                              {  return m_pContext;  };
          virtual AMF_RESULT  AMF_STD_CALL  SetOutputDataAllocatorCB(AMFDataAllocatorCB* /*callback*/)    {  return AMF_NOT_SUPPORTED;  };
          virtual AMF_RESULT  AMF_STD_CALL  GetCaps(AMFCaps** /*ppCaps*/)                                 {  return AMF_NOT_SUPPORTED;  };
          virtual AMF_RESULT  AMF_STD_CALL  Optimize(AMFComponentOptimizationCallback* /*pCallback*/)     {  return AMF_OK;  };
  
          // AMFPropertyStorageObserver interface
          virtual void        AMF_STD_CALL  OnPropertyChanged(const wchar_t* pName);
  
      private:
        mutable AMFCriticalSection  m_sync;
  
          AMFContextPtr            m_pContext;
  
          // member variables from AMFAudioConverterFFMPEG
          AVAudioResampleContext*  m_pResampler;
  
          AMFAudioBufferPtr        m_pInputData;
  
          short*                   m_pTempBuffer;
          amf_size                 m_uiTempBufferSize;
  
          // cache property values and update them on 
          // OnPropertyChanged so we don't have to get
          // every single time we need them as it 
          // might be quite expensive
          AMF_AUDIO_FORMAT        m_inSampleFormat;
          AMF_AUDIO_FORMAT        m_outSampleFormat;
          amf_int64               m_inSampleRate;
          amf_int64               m_outSampleRate;
          amf_int64               m_inChannels;
          amf_int64               m_outChannels;
          bool                    m_bEof;
          bool                    m_bDrained;
          amf_pts                 m_ptsNext;
  
          amf_int64               m_audioFrameSubmitCount;
          amf_int64               m_audioFrameQueryCount;
  
          AMFAudioConverterFFMPEGImpl(const AMFAudioConverterFFMPEGImpl&);
          AMFAudioConverterFFMPEGImpl& operator=(const AMFAudioConverterFFMPEGImpl&);
      };
      
  }
  
  