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9aa3c44d4e
* add config and GUI support for internal player back end switching;
* make FFmpeg player disabling option consistent with other similar
qmake options by using CONFIG;
* add a new qmake option that disables Qt Multimedia player. This is
useful for GNU/Linux distributions where Qt WebKit and Qt Multimedia
packages depend on different GStreamer versions and don't work
correctly when combined in one application.
The existing FFmpeg+libao internal player back end has a relatively
low-level implementation, which is difficult to understand and improve.
There are at least 3 open internal player issues:
1) many GNU/Linux users have to edit their libao configuration file to
make Goldendict's internal player work (issue #412);
2) libao's pulseaudio plugin does not support 32-bit audio, which
means that many MediaWiki pronunciations don't work with the most
popular GNU/Linux audio driver (issue #949);
3) Ffmpeg::DecoderContext uses deprecated FFmpeg APIs, which causes
compiler warnings and means that this internal player back end
may not compile with a future FFmpeg library version (issue #978).
The Qt Multimedia back end implementation uses the highest-level
Qt audio API and is very simple.
This new back end works flawlessly on my GNU/Linux machine.
I'm not making it the default back end because I don't know how well
it will work on other platforms with different configurations.
44 lines
1.2 KiB
C++
44 lines
1.2 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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#ifdef MAKE_QTMULTIMEDIA_PLAYER
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#include <QByteArray>
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#include <QMediaContent>
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#include "multimediaaudioplayer.hh"
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MultimediaAudioPlayer::MultimediaAudioPlayer() :
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player( 0, QMediaPlayer::StreamPlayback )
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{
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typedef void( QMediaPlayer::* ErrorSignal )( QMediaPlayer::Error );
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connect( &player, static_cast< ErrorSignal >( &QMediaPlayer::error ),
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this, &MultimediaAudioPlayer::onMediaPlayerError );
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}
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QString MultimediaAudioPlayer::play( const char * data, int size )
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{
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stop();
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audioBuffer.setData( data, size );
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if( !audioBuffer.open( QIODevice::ReadOnly ) )
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return tr( "Couldn't open audio buffer for reading." );
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player.setMedia( QMediaContent(), &audioBuffer );
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player.play();
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return QString();
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}
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void MultimediaAudioPlayer::stop()
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{
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player.setMedia( QMediaContent() ); // Forget about audioBuffer.
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audioBuffer.close();
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audioBuffer.setData( QByteArray() ); // Free memory.
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}
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void MultimediaAudioPlayer::onMediaPlayerError()
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{
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emit error( player.errorString() );
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}
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#endif // MAKE_QTMULTIMEDIA_PLAYER
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