mirror of
https://github.com/xiaoyifang/goldendict-ng.git
synced 2024-11-25 01:14:07 +00:00
278e05cbf3
External and internal audio players work similarly now. Fixes #950. * inherit a new ExternalAudioPlayer class from AudioPlayerInterface; * use an existing ExternalViewer class to implement ExternalAudioPlayer; * take (const char *, int) instead of std::vector<char> in ExternalViewer constructor to fit into AudioPlayerInterface; * extend ExternalViewer API to let ExternalAudioPlayer stop superseded audio player processes; * make AudioPlayerInterface::play() return an error message string to allow reporting immediate failures from derived classes; * Document AudioPlayerInterface API; * Document AudioPlayerFactory::player(); * use the common audio interface exclusively in ArticleView.
100 lines
2.9 KiB
C++
100 lines
2.9 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 "externalaudioplayer.hh"
|
|
#include "externalviewer.hh"
|
|
|
|
ExternalAudioPlayer::ExternalAudioPlayer() : exitingViewer( 0 )
|
|
{
|
|
}
|
|
|
|
ExternalAudioPlayer::~ExternalAudioPlayer()
|
|
{
|
|
// Destroy viewers immediately to prevent memory and temporary file leaks
|
|
// at application exit.
|
|
|
|
// Set viewer to null first and foremost to make sure that onViewerDestroyed()
|
|
// doesn't attempt to start viewer or mess the smart pointer up.
|
|
stopAndDestroySynchronously( viewer.take() );
|
|
|
|
stopAndDestroySynchronously( exitingViewer );
|
|
}
|
|
|
|
void ExternalAudioPlayer::setPlayerCommandLine( QString const & playerCommandLine_ )
|
|
{
|
|
playerCommandLine = playerCommandLine_;
|
|
}
|
|
|
|
QString ExternalAudioPlayer::play( const char * data, int size )
|
|
{
|
|
stop();
|
|
|
|
Q_ASSERT( !viewer && "viewer must be null at this point for exception safety." );
|
|
try
|
|
{
|
|
// Our destructor properly destroys viewers we remember about.
|
|
// In the unlikely case that we call viewer.reset() during the application
|
|
// exit, ~QObject() prevents leaks as this class is a parent of all viewers.
|
|
viewer.reset( new ExternalViewer( data, size, "wav", playerCommandLine, this ) );
|
|
}
|
|
catch( const ExternalViewer::Ex & e )
|
|
{
|
|
return e.what();
|
|
}
|
|
|
|
if( exitingViewer )
|
|
return QString(); // Will start later.
|
|
return startViewer();
|
|
}
|
|
|
|
void ExternalAudioPlayer::stop()
|
|
{
|
|
if( !exitingViewer && viewer && !viewer->stop() )
|
|
{
|
|
// Give the previous viewer a chance to stop before starting a new one.
|
|
// This prevents overlapping audio and possible conflicts between
|
|
// external program instances.
|
|
// Graceful stopping is better than calling viewer.reset() because:
|
|
// 1) the process gets a chance to clean up and save its state;
|
|
// 2) there is no event loop blocking and consequently no (short) UI freeze
|
|
// while synchronously waiting for the external process to exit.
|
|
exitingViewer = viewer.take();
|
|
}
|
|
else // viewer is either not started or already stopped -> simply destroy it.
|
|
viewer.reset();
|
|
}
|
|
|
|
void ExternalAudioPlayer::onViewerDestroyed( QObject * destroyedViewer )
|
|
{
|
|
if( exitingViewer == destroyedViewer )
|
|
{
|
|
exitingViewer = 0;
|
|
if( viewer )
|
|
{
|
|
QString errorMessage = startViewer();
|
|
if( !errorMessage.isEmpty() )
|
|
emit error( errorMessage );
|
|
}
|
|
}
|
|
else
|
|
if( viewer.data() == destroyedViewer )
|
|
viewer.take(); // viewer finished and died -> release ownership.
|
|
}
|
|
|
|
QString ExternalAudioPlayer::startViewer()
|
|
{
|
|
Q_ASSERT( !exitingViewer && viewer );
|
|
connect( viewer.data(), SIGNAL( destroyed( QObject * ) ),
|
|
this, SLOT( onViewerDestroyed( QObject * ) ) );
|
|
try
|
|
{
|
|
viewer->start();
|
|
}
|
|
catch( const ExternalViewer::Ex & e )
|
|
{
|
|
viewer.reset();
|
|
return e.what();
|
|
}
|
|
return QString();
|
|
}
|