avmedia/source/win/framegrabber.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21
  22 #include <memory>
  23
  24 #include <prewin.h>
  25 #include <postwin.h>
  26 #include <objbase.h>
  27 #include <strmif.h>
  28 #include <Amvideo.h>
  29 #include "interface.hxx"
  30 #include <uuids.h>
  31
  32 #include "framegrabber.hxx"
  33 #include "player.hxx"
  34
  35 #include <cppuhelper/supportsservice.hxx>
  36 #include <osl/file.hxx>
  37 #include <tools/stream.hxx>
  38 #include <vcl/graph.hxx>
  39 #include <vcl/dibtools.hxx>
  40 #include <o3tl/char16_t2wchar_t.hxx>
  41
  42 #define AVMEDIA_WIN_FRAMEGRABBER_IMPLEMENTATIONNAME "com.sun.star.comp.avmedia.FrameGrabber_DirectX"
  43 #define AVMEDIA_WIN_FRAMEGRABBER_SERVICENAME "com.sun.star.media.FrameGrabber_DirectX"
  44
  45 using namespace ::com::sun::star;
  46
  47 namespace avmedia { namespace win {
  48
  49
  50 FrameGrabber::FrameGrabber( const uno::Reference< lang::XMultiServiceFactory >& rxMgr ) :
  51     mxMgr( rxMgr )
  52 {
  53     ::CoInitialize( nullptr );
  54 }
  55
  56
  57 FrameGrabber::~FrameGrabber()
  58 {
  59     ::CoUninitialize();
  60 }
  61
  62 namespace {
  63
  64 IMediaDet* implCreateMediaDet( const OUString& rURL )
  65 {
  66     IMediaDet* pDet = nullptr;
  67
  68     if( SUCCEEDED( CoCreateInstance( CLSID_MediaDet, nullptr, CLSCTX_INPROC_SERVER, IID_IMediaDet, reinterpret_cast<void**>(&pDet) ) ) )
  69     {
  70         OUString aLocalStr;
  71
  72         if( osl::FileBase::getSystemPathFromFileURL( rURL, aLocalStr )
  73             == osl::FileBase::E_None )
  74         {
  75             BSTR bstrFilename = SysAllocString(o3tl::toW(aLocalStr.getStr()));
  76             if( !SUCCEEDED( pDet->put_Filename( bstrFilename ) ) )
  77             {
  78                 // Shouldn't we free this string unconditionally, not only in case of failure?
  79                 // I cannot find information why do we pass a newly allocated BSTR to the put_Filename
  80                 // and if it frees the string internally
  81                 SysFreeString(bstrFilename);
  82                 pDet->Release();
  83                 pDet = nullptr;
  84             }
  85         }
  86     }
  87
  88     return pDet;
  89 }
  90
  91 }
  92
  93 bool FrameGrabber::create( const OUString& rURL )
  94 {
  95     // just check if a MediaDet interface can be created with the given URL
  96     IMediaDet*  pDet = implCreateMediaDet( rURL );
  97
  98     if( pDet )
  99     {
 100         maURL = rURL;
 101         pDet->Release();
 102         pDet = nullptr;
 103     }
 104     else
 105         maURL.clear();
 106
 107     return !maURL.isEmpty();
 108 }
 109
 110
 111 uno::Reference< graphic::XGraphic > SAL_CALL FrameGrabber::grabFrame( double fMediaTime )
 112 {
 113     uno::Reference< graphic::XGraphic > xRet;
 114     IMediaDet*                          pDet = implCreateMediaDet( maURL );
 115
 116     if( pDet )
 117     {
 118         double  fLength;
 119         long    nStreamCount;
 120         bool    bFound = false;
 121
 122         if( SUCCEEDED( pDet->get_OutputStreams( &nStreamCount ) ) )
 123         {
 124             for( long n = 0; ( n < nStreamCount ) && !bFound; ++n )
 125             {
 126                 GUID aMajorType;
 127
 128                 if( SUCCEEDED( pDet->put_CurrentStream( n ) )  &&
 129                     SUCCEEDED( pDet->get_StreamType( &aMajorType ) ) &&
 130                     ( aMajorType == MEDIATYPE_Video ) )
 131                 {
 132                     bFound = true;
 133                 }
 134             }
 135         }
 136
 137         if( bFound &&
 138             ( S_OK == pDet->get_StreamLength( &fLength ) ) &&
 139             ( fLength > 0.0 ) && ( fMediaTime >= 0.0 ) && ( fMediaTime <= fLength ) )
 140         {
 141             AM_MEDIA_TYPE   aMediaType;
 142             long            nWidth = 0, nHeight = 0, nSize = 0;
 143
 144             if( SUCCEEDED( pDet->get_StreamMediaType( &aMediaType ) ) )
 145             {
 146                 if( ( aMediaType.formattype == FORMAT_VideoInfo ) &&
 147                     ( aMediaType.cbFormat >= sizeof( VIDEOINFOHEADER ) ) )
 148                 {
 149                     VIDEOINFOHEADER* pVih = reinterpret_cast< VIDEOINFOHEADER* >( aMediaType.pbFormat );
 150
 151                     nWidth = pVih->bmiHeader.biWidth;
 152                     nHeight = pVih->bmiHeader.biHeight;
 153
 154                     if( nHeight < 0 )
 155                         nHeight *= -1;
 156                 }
 157
 158                 if( aMediaType.cbFormat != 0 )
 159                 {
 160                     ::CoTaskMemFree( aMediaType.pbFormat );
 161                     aMediaType.cbFormat = 0;
 162                     aMediaType.pbFormat = nullptr;
 163                 }
 164
 165                 if( aMediaType.pUnk != nullptr )
 166                 {
 167                     aMediaType.pUnk->Release();
 168                     aMediaType.pUnk = nullptr;
 169                 }
 170             }
 171
 172             if( ( nWidth > 0 ) && ( nHeight > 0 ) &&
 173                 SUCCEEDED( pDet->GetBitmapBits( 0, &nSize, nullptr, nWidth, nHeight ) ) &&
 174                 ( nSize > 0  ) )
 175             {
 176                 auto pBuffer = std::make_unique<char[]>(nSize);
 177
 178                 try
 179                 {
 180                     if( SUCCEEDED( pDet->GetBitmapBits( fMediaTime, nullptr, pBuffer.get(), nWidth, nHeight ) ) )
 181                     {
 182                         SvMemoryStream  aMemStm( pBuffer.get(), nSize, StreamMode::READ | StreamMode::WRITE );
 183                         Bitmap          aBmp;
 184
 185                         if( ReadDIB(aBmp, aMemStm, false ) && !aBmp.IsEmpty() )
 186                         {
 187                             const Graphic aGraphic( aBmp );
 188                             xRet = aGraphic.GetXGraphic();
 189                         }
 190                     }
 191                 }
 192                 catch( ... )
 193                 {
 194                 }
 195             }
 196         }
 197
 198         pDet->Release();
 199     }
 200
 201     return xRet;
 202 }
 203
 204
 205 OUString SAL_CALL FrameGrabber::getImplementationName(  )
 206 {
 207     return OUString( AVMEDIA_WIN_FRAMEGRABBER_IMPLEMENTATIONNAME );
 208 }
 209
 210
 211 sal_Bool SAL_CALL FrameGrabber::supportsService( const OUString& ServiceName )
 212 {
 213     return cppu::supportsService(this, ServiceName);
 214 }
 215
 216
 217 uno::Sequence< OUString > SAL_CALL FrameGrabber::getSupportedServiceNames(  )
 218 {
 219     return { AVMEDIA_WIN_FRAMEGRABBER_SERVICENAME };
 220 }
 221
 222 } // namespace win
 223 } // namespace avmedia
 224
 225 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */