mirror of
https://github.com/xiaoyifang/goldendict-ng.git
synced 2024-12-18 07:24:07 +00:00
19ab09b754
qobject_cast() implementations in Qt4 and Qt5 until version 5.4 unconditionally dereference the argument to access a static member. This is undefined behavior. When Goldendict is compiled with GCC's -fsanitize=undefined option in Release mode and launched with <useInternalPlayer>1</useInternalPlayer> in config, the application crashes right away with the following message: runtime error: member call on null pointer of type 'struct AudioPlayer'
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/* This file is (c) 2018 Igor Kushnir <igorkuo@gmail.com>
|
|
* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
|
|
|
|
#include <QScopedPointer>
|
|
#include <QObject>
|
|
#include "audioplayerfactory.hh"
|
|
#include "ffmpegaudioplayer.hh"
|
|
#include "multimediaaudioplayer.hh"
|
|
#include "externalaudioplayer.hh"
|
|
#include "gddebug.hh"
|
|
|
|
AudioPlayerFactory::AudioPlayerFactory( Config::Preferences const & p ) :
|
|
useInternalPlayer( p.useInternalPlayer ),
|
|
internalPlayerBackend( p.internalPlayerBackend ),
|
|
audioPlaybackProgram( p.audioPlaybackProgram )
|
|
{
|
|
reset();
|
|
}
|
|
|
|
void AudioPlayerFactory::setPreferences( Config::Preferences const & p )
|
|
{
|
|
if( p.useInternalPlayer != useInternalPlayer )
|
|
{
|
|
useInternalPlayer = p.useInternalPlayer;
|
|
internalPlayerBackend = p.internalPlayerBackend;
|
|
audioPlaybackProgram = p.audioPlaybackProgram;
|
|
reset();
|
|
}
|
|
else
|
|
if( useInternalPlayer && p.internalPlayerBackend != internalPlayerBackend )
|
|
{
|
|
internalPlayerBackend = p.internalPlayerBackend;
|
|
reset();
|
|
}
|
|
else
|
|
if( !useInternalPlayer && p.audioPlaybackProgram != audioPlaybackProgram )
|
|
{
|
|
audioPlaybackProgram = p.audioPlaybackProgram;
|
|
ExternalAudioPlayer * const externalPlayer =
|
|
qobject_cast< ExternalAudioPlayer * >( playerPtr.data() );
|
|
if( externalPlayer )
|
|
setAudioPlaybackProgram( *externalPlayer );
|
|
else
|
|
gdWarning( "External player was expected, but it does not exist.\n" );
|
|
}
|
|
}
|
|
|
|
void AudioPlayerFactory::reset()
|
|
{
|
|
if( useInternalPlayer )
|
|
{
|
|
// qobject_cast checks below account for the case when an unsupported backend
|
|
// is stored in config. After this backend is replaced with the default one
|
|
// upon preferences saving, the code below does not reset playerPtr with
|
|
// another object of the same type.
|
|
|
|
#ifdef MAKE_FFMPEG_PLAYER
|
|
Q_ASSERT( Config::InternalPlayerBackend::defaultBackend().isFfmpeg()
|
|
&& "Adjust the code below after changing the default backend." );
|
|
|
|
if( !internalPlayerBackend.isQtmultimedia() )
|
|
{
|
|
if( !playerPtr || !qobject_cast< Ffmpeg::AudioPlayer * >( playerPtr.data() ) )
|
|
playerPtr.reset( new Ffmpeg::AudioPlayer );
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifdef MAKE_QTMULTIMEDIA_PLAYER
|
|
if( !playerPtr || !qobject_cast< MultimediaAudioPlayer * >( playerPtr.data() ) )
|
|
playerPtr.reset( new MultimediaAudioPlayer );
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
QScopedPointer< ExternalAudioPlayer > externalPlayer( new ExternalAudioPlayer );
|
|
setAudioPlaybackProgram( *externalPlayer );
|
|
playerPtr.reset( externalPlayer.take() );
|
|
}
|
|
|
|
void AudioPlayerFactory::setAudioPlaybackProgram( ExternalAudioPlayer & externalPlayer )
|
|
{
|
|
externalPlayer.setPlayerCommandLine( audioPlaybackProgram.trimmed() );
|
|
}
|