text: //-----------------------------------------------------------------------------
  //
  // TSDuck - The MPEG Transport Stream Toolkit
  // Copyright (c) 2005-2021, Thierry Lelegard
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  // 1. Redistributions of source code must retain the above copyright notice,
  //    this list of conditions and the following disclaimer.
  // 2. 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.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
  //
  //-----------------------------------------------------------------------------
  
  #include "tsMediaTypeUtils.h"
  TSDUCK_SOURCE;
  
  
  //-----------------------------------------------------------------------------
  // General purpose function to delete a heap allocated AM_MEDIA_TYPE structure
  // which is useful when calling IEnumMediaTypes::Next as the interface
  // implementation allocates the structures which you must later delete
  // the format block may also be a pointer to an interface to release.
  // Extracted from DirectShow base classes in Windows SDK.
  //-----------------------------------------------------------------------------
  
  void ts::DeleteMediaType (::AM_MEDIA_TYPE* pmt)
  {
      if (pmt != NULL) {
          ts::FreeMediaType (*pmt);
          ::CoTaskMemFree (pmt);
      }
  }
  
  
  //-----------------------------------------------------------------------------
  // Free an existing media type (ie free resources it holds)
  //-----------------------------------------------------------------------------
  
  void ts::FreeMediaType (::AM_MEDIA_TYPE& mt)
  {
      if (mt.cbFormat != 0) {
          ::CoTaskMemFree (mt.pbFormat);
          mt.cbFormat = 0;
          mt.pbFormat = NULL;
      }
      if (mt.pUnk != NULL) {
          mt.pUnk->Release();
          mt.pUnk = NULL;
      }
  }
  
  
  //-----------------------------------------------------------------------------
  // Copy a media type to another
  //-----------------------------------------------------------------------------
  
  ::HRESULT ts::CopyMediaType (::AM_MEDIA_TYPE& dst, const ::AM_MEDIA_TYPE& src)
  {
      assert (&src != &dst);
      dst = src;
      if (src.cbFormat != 0) {
          assert (src.pbFormat != NULL);
          dst.pbFormat = reinterpret_cast<::BYTE*> (::CoTaskMemAlloc (src.cbFormat));
          if (dst.pbFormat == NULL) {
              dst.cbFormat = 0;
              return E_OUTOFMEMORY;
          }
          else {
              ::CopyMemory(dst.pbFormat, src.pbFormat, dst.cbFormat);  // Flawfinder: ignore: CopyMemory()
          }
      }
      if (dst.pUnk != NULL) {
          dst.pUnk->AddRef();
      }
      return S_OK;
  }
  
  //-----------------------------------------------------------------------------
  // Initialize a media type with "null" values
  //-----------------------------------------------------------------------------
  
  void ts::InitMediaType (::AM_MEDIA_TYPE& mt)
  {
      mt.majortype = GUID_NULL;
      mt.subtype = GUID_NULL;
      mt.bFixedSizeSamples = 0;
      mt.bTemporalCompression = 0;
      mt.lSampleSize = 0;
      mt.formattype = GUID_NULL;
      mt.pUnk = NULL;
      mt.cbFormat = 0;
      mt.pbFormat = NULL;
  }
  