avmedia/source/vlc/vlcframegrabber.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.
   4  *
   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 <chrono>
  21 #include <iostream>
  22 #include <osl/conditn.hxx>
  23 #include <osl/file.hxx>
  24 #include <vcl/graph.hxx>
  25 #include <vcl/bitmapaccess.hxx>
  26 #include <vcl/pngread.hxx>
  27 #include <avmedia/mediawindow.hxx>
  28 #include <unotools/tempfile.hxx>
  29 #include <unotools/ucbstreamhelper.hxx>
  30 #include <tools/stream.hxx>
  31 #include <cppuhelper/supportsservice.hxx>
  32 #include <sal/log.hxx>
  33
  34 #include "vlcframegrabber.hxx"
  35 #include "vlcplayer.hxx"
  36 #include <wrapper/Player.hxx>
  37 #include <wrapper/EventManager.hxx>
  38
  39 using namespace ::com::sun::star;
  40
  41 namespace avmedia {
  42 namespace vlc {
  43
  44 namespace
  45 {
  46     const OUString AVMEDIA_VLC_GRABBER_IMPLEMENTATIONNAME = "com.sun.star.comp.avmedia.VLCFrameGrabber_VLC";
  47     const OUString AVMEDIA_VLC_GRABBER_SERVICENAME = "com.sun.star.media.VLCFrameGrabber_VLC";
  48     const int MSEC_IN_SEC = 1000;
  49
  50     const char * const VLC_ARGS[] = {
  51         "-Vdummy",
  52         "--demux",
  53         "ffmpeg",
  54         "--snapshot-format=png",
  55         "--ffmpeg-threads", /* Is deprecated in 2.1.0 */
  56         "--verbose=-1",
  57         "--no-audio"
  58     };
  59 }
  60
  61 VLCFrameGrabber::VLCFrameGrabber( wrapper::EventHandler& eh, const OUString& url )
  62     : FrameGrabber_BASE()
  63     , mInstance( SAL_N_ELEMENTS(VLC_ARGS), VLC_ARGS )
  64     , mMedia( url, mInstance )
  65     , mPlayer( mMedia )
  66     , mEventHandler( eh )
  67 {
  68 }
  69
  70 ::uno::Reference< css::graphic::XGraphic > SAL_CALL VLCFrameGrabber::grabFrame( double fMediaTime )
  71 {
  72     osl::Condition condition;
  73
  74     const OUString& fileName = utl::TempFile::CreateTempName();
  75     {
  76         wrapper::EventManager manager( mPlayer, mEventHandler );
  77         manager.onPaused([&condition](){ condition.set(); });
  78
  79         if ( !mPlayer.play() )
  80         {
  81             SAL_WARN("avmedia", "Couldn't play when trying to grab frame");
  82             return ::uno::Reference< css::graphic::XGraphic >();
  83         }
  84
  85         mPlayer.setTime( std::max(fMediaTime, 0.0) * MSEC_IN_SEC );
  86         mPlayer.pause();
  87
  88         condition.wait(std::chrono::seconds(2));
  89
  90         if ( !mPlayer.hasVout() )
  91         {
  92             SAL_WARN("avmedia", "Couldn't grab frame");
  93             manager.onPaused();
  94             return ::uno::Reference< css::graphic::XGraphic >();
  95         }
  96
  97         mPlayer.takeSnapshot( fileName );
  98         mPlayer.stop();
  99
 100         manager.onPaused();
 101     }
 102
 103     OUString url;
 104     osl::FileBase::getFileURLFromSystemPath( fileName, url );
 105     std::shared_ptr<SvStream> stream( utl::UcbStreamHelper::CreateStream( url,
 106                                                                             StreamMode::STD_READ ) );
 107
 108     vcl::PNGReader reader( *stream );
 109
 110     const BitmapEx& bitmap = reader.Read();
 111
 112     return Graphic( bitmap ).GetXGraphic();
 113 }
 114
 115 OUString SAL_CALL VLCFrameGrabber::getImplementationName()
 116 {
 117     return AVMEDIA_VLC_GRABBER_IMPLEMENTATIONNAME;
 118 }
 119
 120 sal_Bool SAL_CALL VLCFrameGrabber::supportsService( const OUString& serviceName )
 121 {
 122     return cppu::supportsService(this, serviceName);
 123 }
 124
 125 ::uno::Sequence< OUString > SAL_CALL VLCFrameGrabber::getSupportedServiceNames()
 126 {
 127     return { AVMEDIA_VLC_GRABBER_SERVICENAME };
 128 }
 129
 130 }
 131 }
 132
 133 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */