From 9bb7a06256dd3fc1682b43c3d3cfb383adf8961f Mon Sep 17 00:00:00 2001
From: dridri <dridri85@gmail.com>
Date: Sun, 28 Sep 2014 13:36:32 +0200
Subject: [PATCH] Added DSP callback support for VLC phonon

---
 src/libtomahawk/audio/AudioEngine.cpp | 53 ++++++++-------------------
 src/libtomahawk/audio/AudioEngine.h   |  7 ++--
 src/libtomahawk/audio/AudioEngine_p.h |  4 +-
 3 files changed, 20 insertions(+), 44 deletions(-)

diff --git a/src/libtomahawk/audio/AudioEngine.cpp b/src/libtomahawk/audio/AudioEngine.cpp
index c844229cc..64e9d220e 100644
--- a/src/libtomahawk/audio/AudioEngine.cpp
+++ b/src/libtomahawk/audio/AudioEngine.cpp
@@ -215,6 +215,7 @@ AudioEngine::AudioEngine()
     d->state = Stopped;
     d->coverTempFile = 0;
     d->audioEffect = 0;
+    d->dspPluginCallback = 0;
 
     d->s_instance = this;
     tDebug() << "Init AudioEngine";
@@ -236,7 +237,7 @@ AudioEngine::AudioEngine()
     onVolumeChanged( d->audioOutput->volume() );
     setVolume( TomahawkSettings::instance()->volume() );
 
-    initEqualizer();
+    d->mediaObject->setCurrentSource(Phonon::MediaSource("PhononDSP::effectCallback=" + QString::number((qulonglong)&AudioEngine::dspCallback, 16)));
 }
 
 
@@ -1384,52 +1385,28 @@ AudioEngine::setCurrentTrackPlaylist( const playlistinterface_ptr& playlist )
 
 
 void
-AudioEngine::initEqualizer()
+AudioEngine::dspCallback( signed short* samples, int nb_channels, int nb_samples )
+{
+    AudioEngine::instance()->dspCallbackInternal( samples, nb_channels, nb_samples );
+}
+
+
+void
+AudioEngine::dspCallbackInternal( signed short* samples, int nb_channels, int nb_samples )
 {
     Q_D( AudioEngine );
 
-    QList< Phonon::EffectDescription > effectDescriptions = Phonon::BackendCapabilities::availableAudioEffects();
-    foreach ( Phonon::EffectDescription effectDesc, effectDescriptions )
+    if ( d->dspPluginCallback != 0 )
     {
-        if ( effectDesc.name().toLower().contains( "eq" ) )
-        {
-            d->audioEffect = new Phonon::Effect( effectDesc );
-            d->audioPath.insertEffect( d->audioEffect );
-            break;
-        }
+        d->dspPluginCallback( samples, nb_channels, nb_samples );
     }
 }
 
 
-int
-AudioEngine::equalizerBandCount()
+void
+AudioEngine::setDspCallback( void ( *cb ) ( signed short*, int, int ) )
 {
     Q_D( AudioEngine );
 
-    if ( d->audioEffect )
-    {
-        QList< Phonon::EffectParameter > params = d->audioEffect->parameters();
-        return params.size();
-    }
-
-    return 0;
-}
-
-
-bool
-AudioEngine::setEqualizerBand( int band, int value )
-{
-    Q_D( AudioEngine );
-
-    if ( d->audioEffect )
-    {
-        QList< Phonon::EffectParameter > params = d->audioEffect->parameters();
-        if ( band < params.size() )
-        {
-            d->audioEffect->setParameterValue( params.at( band ), value );
-            return true;
-        }
-    }
-
-    return false;
+    d->dspPluginCallback = cb;
 }
diff --git a/src/libtomahawk/audio/AudioEngine.h b/src/libtomahawk/audio/AudioEngine.h
index 25a0c5c07..db9ca1884 100644
--- a/src/libtomahawk/audio/AudioEngine.h
+++ b/src/libtomahawk/audio/AudioEngine.h
@@ -109,8 +109,7 @@ public:
      */
     qint64 currentTrackTotalTime() const;
 
-    int equalizerBandCount();
-    bool setEqualizerBand( int band, int value );
+    void setDspCallback( void ( *cb ) ( signed short* samples, int nb_channels, int nb_samples ) );
 
 public slots:
     void playPause();
@@ -200,9 +199,9 @@ private slots:
 private:
     void setState( AudioState state );
     void setCurrentTrackPlaylist( const Tomahawk::playlistinterface_ptr& playlist );
-    void initEqualizer();
 
-    void initEqualizer();
+    static void dspCallback( signed short* samples, int nb_channels, int nb_samples );
+    void dspCallbackInternal( signed short* samples, int nb_channels, int nb_samples );
     void audioDataArrived( QMap< AudioEngine::AudioChannel, QVector< qint16 > >& data );
 
 
diff --git a/src/libtomahawk/audio/AudioEngine_p.h b/src/libtomahawk/audio/AudioEngine_p.h
index be87094fa..b03338634 100644
--- a/src/libtomahawk/audio/AudioEngine_p.h
+++ b/src/libtomahawk/audio/AudioEngine_p.h
@@ -43,8 +43,6 @@ private:
 
     Phonon::MediaObject* mediaObject;
     Phonon::AudioOutput* audioOutput;
-    Phonon::Path audioPath;
-    Phonon::Effect* audioEffect;
 
     Phonon::Path audioPath;
     Phonon::Effect* audioEffect;
@@ -68,5 +66,7 @@ private:
 
     QTemporaryFile* coverTempFile;
 
+    void (* dspPluginCallback )( signed short* samples, int nb_channels, int nb_samples );
+
     static AudioEngine* s_instance;
 };