avmedia/source/vlc/vlcframegrabber.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 #include <boost/bind.hpp>
   3 #include <iostream>
   4 #include <osl/conditn.hxx>
   5 #include <vcl/graph.hxx>
   6 #include <vcl/bmpacc.hxx>
   7 #include <vcl/pngread.hxx>
   8 #include <avmedia/mediawindow.hxx>
   9 #include <unotools/localfilehelper.hxx>
  10 #include <unotools/tempfile.hxx>
  11 #include <unotools/ucbstreamhelper.hxx>
  12 #include <tools/stream.hxx>
  13 #include <cppuhelper/supportsservice.hxx>
  14
  15 #include "vlcframegrabber.hxx"
  16 #include "vlcplayer.hxx"
  17 #include "wrapper/Player.hxx"
  18 #include "wrapper/EventManager.hxx"
  19
  20 using namespace ::com::sun::star;
  21
  22 namespace avmedia {
  23 namespace vlc {
  24
  25 namespace
  26 {
  27     const ::rtl::OUString AVMEDIA_VLC_GRABBER_IMPLEMENTATIONNAME = "com.sun.star.comp.avmedia.VLCFrameGrabber_VLC";
  28     const ::rtl::OUString AVMEDIA_VLC_GRABBER_SERVICENAME = "com.sun.star.media.VLCFrameGrabber_VLC";
  29     const int MSEC_IN_SEC = 1000;
  30
  31     const char * const VLC_ARGS[] = {
  32         "-Vdummy",
  33         "--demux",
  34         "ffmpeg",
  35         "--snapshot-format=png",
  36         "--ffmpeg-threads", /* Is deprecated in 2.1.0 */
  37         "--verbose=-1",
  38         "--no-audio"
  39     };
  40 }
  41
  42 VLCFrameGrabber::VLCFrameGrabber( wrapper::EventHandler& eh, const rtl::OUString& url )
  43     : FrameGrabber_BASE()
  44     , mInstance( sizeof( VLC_ARGS ) / sizeof( VLC_ARGS[0] ), VLC_ARGS )
  45     , mMedia( url, mInstance )
  46     , mPlayer( mMedia )
  47     , mEventHandler( eh )
  48 {
  49 }
  50
  51 ::uno::Reference< css::graphic::XGraphic > SAL_CALL VLCFrameGrabber::grabFrame( double fMediaTime )
  52         throw ( ::com::sun::star::uno::RuntimeException, std::exception )
  53 {
  54     osl::Condition condition;
  55
  56     const rtl::OUString& fileName = utl::TempFile::CreateTempName();
  57     {
  58         wrapper::EventManager manager( mPlayer, mEventHandler );
  59         manager.onPaused(boost::bind(&osl::Condition::set, &condition));
  60
  61         if ( !mPlayer.play() )
  62         {
  63             SAL_WARN("avmedia", "Couldn't play when trying to grab frame");
  64             return ::uno::Reference< css::graphic::XGraphic >();
  65         }
  66
  67         mPlayer.setTime( ( fMediaTime > 0 ? fMediaTime : 0 ) * MSEC_IN_SEC );
  68         mPlayer.pause();
  69
  70         const TimeValue timeout = {2, 0};
  71
  72         condition.wait(&timeout);
  73
  74         if ( !mPlayer.hasVout() )
  75         {
  76             SAL_WARN("avmedia", "Couldn't grab frame");
  77             manager.onPaused();
  78             return ::uno::Reference< css::graphic::XGraphic >();
  79         }
  80
  81         mPlayer.takeSnapshot( fileName );
  82         mPlayer.stop();
  83
  84         manager.onPaused();
  85     }
  86
  87     rtl::OUString url;
  88     utl::LocalFileHelper::ConvertPhysicalNameToURL( fileName, url );
  89     boost::shared_ptr<SvStream> stream( utl::UcbStreamHelper::CreateStream( url,
  90                                                                             STREAM_STD_READ ) );
  91
  92     vcl::PNGReader reader( *stream );
  93
  94     const BitmapEx& bitmap = reader.Read();
  95
  96     return Graphic( bitmap ).GetXGraphic();
  97 }
  98
  99 ::rtl::OUString SAL_CALL VLCFrameGrabber::getImplementationName() throw ( ::com::sun::star::uno::RuntimeException, std::exception )
 100 {
 101     return AVMEDIA_VLC_GRABBER_IMPLEMENTATIONNAME;
 102 }
 103
 104 sal_Bool SAL_CALL VLCFrameGrabber::supportsService( const ::rtl::OUString& serviceName )
 105         throw ( ::com::sun::star::uno::RuntimeException, std::exception )
 106 {
 107     return cppu::supportsService(this, serviceName);
 108 }
 109
 110 ::uno::Sequence< ::rtl::OUString > SAL_CALL VLCFrameGrabber::getSupportedServiceNames()
 111         throw ( ::com::sun::star::uno::RuntimeException, std::exception )
 112 {
 113     ::uno::Sequence< OUString > aRet(1);
 114     aRet[0] = AVMEDIA_VLC_GRABBER_SERVICENAME;
 115     return aRet;
 116 }
 117
 118 }
 119 }
 120
 121 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */