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https://github.com/xiaoyifang/goldendict-ng.git
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96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/* This file is (c) 2018 Igor Kushnir <igorkuo@gmail.com>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#include "externalaudioplayer.hh"
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#include "externalviewer.hh"
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ExternalAudioPlayer::ExternalAudioPlayer():
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exitingViewer( 0 )
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{
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}
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ExternalAudioPlayer::~ExternalAudioPlayer()
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{
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// Destroy viewers immediately to prevent memory and temporary file leaks
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// at application exit.
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// Set viewer to null first and foremost to make sure that onViewerDestroyed()
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// doesn't attempt to start viewer or mess the smart pointer up.
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stopAndDestroySynchronously( viewer.release() );
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stopAndDestroySynchronously( exitingViewer );
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}
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void ExternalAudioPlayer::setPlayerCommandLine( QString const & playerCommandLine_ )
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{
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playerCommandLine = playerCommandLine_;
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}
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QString ExternalAudioPlayer::play( const char * data, int size )
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{
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stop();
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Q_ASSERT( !viewer && "viewer must be null at this point for exception safety." );
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try {
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// Our destructor properly destroys viewers we remember about.
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// In the unlikely case that we call viewer.reset() during the application
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// exit, ~QObject() prevents leaks as this class is a parent of all viewers.
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viewer.reset( new ExternalViewer( data, size, "wav", playerCommandLine, this ) );
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}
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catch ( const ExternalViewer::Ex & e ) {
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return e.what();
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}
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if ( exitingViewer ) {
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return QString(); // Will start later.
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}
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return startViewer();
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}
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void ExternalAudioPlayer::stop()
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{
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if ( !exitingViewer && viewer && !viewer->stop() ) {
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// Give the previous viewer a chance to stop before starting a new one.
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// This prevents overlapping audio and possible conflicts between
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// external program instances.
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// Graceful stopping is better than calling viewer.reset() because:
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// 1) the process gets a chance to clean up and save its state;
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// 2) there is no event loop blocking and consequently no (short) UI freeze
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// while synchronously waiting for the external process to exit.
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exitingViewer = viewer.release();
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}
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else { // viewer is either not started or already stopped -> simply destroy it.
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viewer.reset();
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}
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}
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void ExternalAudioPlayer::onViewerDestroyed( QObject * destroyedViewer )
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{
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if ( exitingViewer == destroyedViewer ) {
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exitingViewer = 0;
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if ( viewer ) {
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QString errorMessage = startViewer();
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if ( !errorMessage.isEmpty() ) {
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emit error( errorMessage );
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}
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}
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}
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else if ( viewer.get() == destroyedViewer ) {
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viewer.reset( nullptr ); // viewer finished and died -> reset
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}
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}
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QString ExternalAudioPlayer::startViewer()
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{
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Q_ASSERT( !exitingViewer && viewer );
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connect( viewer.get(), &QObject::destroyed, this, &ExternalAudioPlayer::onViewerDestroyed );
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try {
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viewer->start();
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}
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catch ( const ExternalViewer::Ex & e ) {
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viewer.reset();
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return e.what();
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}
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return QString();
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}
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