add isStereo to OMixerInterface to gather whether a given channel is a stereo or mono channel

3 files changed, 30 insertions, 4 deletions

diff --git a/libopie2/examples/opiemm/osoundsystemdemo/osoundsystemdemo.cpp b/libopie2/examples/opiemm/osoundsystemdemo/osoundsystemdemo.cpp
index b522441..f74a1b9 100644
--- a/libopie2/examples/opiemm/osoundsystemdemo/osoundsystemdemo.cpp
+++ b/libopie2/examples/opiemm/osoundsystemdemo/osoundsystemdemo.cpp
@@ -1,65 +1,66 @@
 /*
                =.            This file is part of the Opie Project
              .=l.            Copyright (C) 2004 Opie Team <opie-devel@handhelds.org>
            .>+-=
  _;:,     .>    :=|.         This library is free software; you can
 .> <`_,   >  .   <=          redistribute it and/or  modify it under
 :`=1 )Y*s>-.--   :           the terms of the GNU Library General Public
 .="- .-=="i,     .._         License as published by the Free Software
  - .   .-<_>     .<>         Foundation; either version 2 of the License,
      ._= =}       :          or (at your option) any later version.
     .%`+i>       _;_.
     .i_,=:_.      -<s.       This library is distributed in the hope that
      +  .  -:.       =       it will be useful,  but WITHOUT ANY WARRANTY;
     : ..    .:,     . . .    without even the implied warranty of
     =_        +     =;=|`    MERCHANTABILITY or FITNESS FOR A
   _.=:.       :    :=>`:     PARTICULAR PURPOSE. See the GNU
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 
 */
 
 /* OPIE */
 #include <opie2/osoundsystem.h>
 #include <opie2/odebug.h>
 
 using namespace Opie::MM;
 
 int main( int argc, char** argv )
 {
     odebug << "OPIE Sound System Demo" << oendl;
 
     OSoundSystem* sound = OSoundSystem::instance();
 
     OSoundSystem::CardIterator it = sound->iterator();
 /*
     while ( it.current() )
     {
         odebug << "DEMO: OSoundSystem contains Interface '" <<  it.current()->name() << "'" << oendl;
         ++it;
     }
 
 */
     OSoundCard* card = it.current();
 
     OMixerInterface* mixer = card->mixer();
 
     QStringList channels = mixer->allChannels();
 
     for ( QStringList::Iterator it = channels.begin(); it != channels.end(); ++it )
     {
-        odebug << "OSSDEMO: Mixer has channel " <<  *it << "" << oendl;
+        bool stereo = mixer->isStereo( *it );
+        odebug << "OSSDEMO: Mixer has channel " << *it << ( stereo ? "[stereo]" : "[mono]" ) << oendl;
         odebug << "OSSDEMO:              +--- volume " << ( mixer->volume( *it ) & 0xff )
                << " (left) | " << ( mixer->volume( *it ) >> 8 ) << " (right)" << oendl;
     }
 
     return 0;
 
 }
diff --git a/libopie2/opiemm/osoundsystem.cpp b/libopie2/opiemm/osoundsystem.cpp
index 13b26e6..09fd28f 100644
--- a/libopie2/opiemm/osoundsystem.cpp
+++ b/libopie2/opiemm/osoundsystem.cpp
@@ -133,188 +133,209 @@ OSoundCard::OSoundCard( QObject* parent, const char* name )
 OSoundCard::~OSoundCard()
 {
 }
 
 
 void OSoundCard::init()
 {
 #ifdef QT_QWS_DEVFS
     _audio = new OAudioInterface( this, "/dev/sound/dsp" );
     _mixer = new OMixerInterface( this, "/dev/sound/mixer" );
 #else
     _audio = new OAudioInterface( this, "/dev/dsp" );
     _mixer = new OMixerInterface( this, "/dev/mixer" );
 #endif
 }
 
 
 /*======================================================================================
  * OAudioInterface
  *======================================================================================*/
 
 OAudioInterface::OAudioInterface( QObject* parent, const char* name )
                  :QObject( parent, name ), _sfd(0)
 {
     odebug << "OAudioInterface::OAudioInterface()" << oendl;
     init();
 }
 
 
 OAudioInterface::~OAudioInterface()
 {
 }
 
 
 void OAudioInterface::init()
 {
 
 
 }
 
 
 /*======================================================================================
  * OMixerInterface
  *======================================================================================*/
 
 OMixerInterface::OMixerInterface( QObject* parent, const char* name )
                  :QObject( parent, name )
 {
     odebug << "OMixerInterface::OMixerInterface()" << oendl;
     init();
 }
 
 
 OMixerInterface::~OMixerInterface()
 {
 }
 
 
 void OMixerInterface::init()
 {
     // open the device
     _fd = ::open( name(), O_RDWR );
     if ( _fd == -1 )
     {
-        owarn << "OMixerInterface::init(): Can't open mixer." << oendl;
+        owarn << "OMixerInterface::init(): Can't open mixer " << name() << oendl;
         return;
     }
 
     // construct the device capabilities
     int devmask = 0;
     if ( ioctl( _fd, SOUND_MIXER_READ_DEVMASK, &devmask ) != -1 )
     {
         if ( devmask & ( 1 << SOUND_MIXER_VOLUME ) )    _channels.insert( "PlayVolume", SOUND_MIXER_VOLUME );
         if ( devmask & ( 1 << SOUND_MIXER_BASS ) )      _channels.insert( "PlayBass", SOUND_MIXER_BASS );
         if ( devmask & ( 1 << SOUND_MIXER_TREBLE ) )    _channels.insert( "PlayTreble", SOUND_MIXER_TREBLE );
         if ( devmask & ( 1 << SOUND_MIXER_SYNTH ) )     _channels.insert( "PlaySynth", SOUND_MIXER_SYNTH );
         if ( devmask & ( 1 << SOUND_MIXER_PCM ) )       _channels.insert( "PlayPCM", SOUND_MIXER_PCM );
         if ( devmask & ( 1 << SOUND_MIXER_SPEAKER ) )   _channels.insert( "PlaySpeaker", SOUND_MIXER_SPEAKER );
         if ( devmask & ( 1 << SOUND_MIXER_LINE ) )      _channels.insert( "PlayLine", SOUND_MIXER_LINE );
         if ( devmask & ( 1 << SOUND_MIXER_MIC ) )       _channels.insert( "PlayMic", SOUND_MIXER_MIC );
         if ( devmask & ( 1 << SOUND_MIXER_CD ) )        _channels.insert( "PlayCD", SOUND_MIXER_CD );
         if ( devmask & ( 1 << SOUND_MIXER_IMIX ) )      _channels.insert( "PlayInputMix", SOUND_MIXER_IMIX );
         if ( devmask & ( 1 << SOUND_MIXER_ALTPCM ) )    _channels.insert( "PlayAltPCM", SOUND_MIXER_ALTPCM );
         if ( devmask & ( 1 << SOUND_MIXER_RECLEV ) )    _channels.insert( "PlayRecord", SOUND_MIXER_RECLEV );
         if ( devmask & ( 1 << SOUND_MIXER_IGAIN ) )     _channels.insert( "PlayInputGain", SOUND_MIXER_IGAIN );
         if ( devmask & ( 1 << SOUND_MIXER_OGAIN ) )     _channels.insert( "PlayOutputGain", SOUND_MIXER_OGAIN );
         //odebug << "devmask available and constructed." << oendl;
     }
 
     devmask = 0;
     if ( ioctl( _fd, SOUND_MIXER_READ_RECMASK, &devmask ) != -1 )
     {
         if ( devmask & ( 1 << SOUND_MIXER_VOLUME ) )    _channels.insert( "RecVolume", SOUND_MIXER_VOLUME );
         if ( devmask & ( 1 << SOUND_MIXER_BASS ) )      _channels.insert( "RecBass", SOUND_MIXER_BASS );
         if ( devmask & ( 1 << SOUND_MIXER_TREBLE ) )    _channels.insert( "RecTreble", SOUND_MIXER_TREBLE );
         if ( devmask & ( 1 << SOUND_MIXER_SYNTH ) )     _channels.insert( "RecSynth", SOUND_MIXER_SYNTH );
         if ( devmask & ( 1 << SOUND_MIXER_PCM ) )       _channels.insert( "RecPCM", SOUND_MIXER_PCM );
         if ( devmask & ( 1 << SOUND_MIXER_SPEAKER ) )   _channels.insert( "RecSpeaker", SOUND_MIXER_SPEAKER );
         if ( devmask & ( 1 << SOUND_MIXER_LINE ) )      _channels.insert( "RecLine", SOUND_MIXER_LINE );
         if ( devmask & ( 1 << SOUND_MIXER_MIC ) )       _channels.insert( "RecMic", SOUND_MIXER_MIC );
         if ( devmask & ( 1 << SOUND_MIXER_CD ) )        _channels.insert( "RecCD", SOUND_MIXER_CD );
         if ( devmask & ( 1 << SOUND_MIXER_IMIX ) )      _channels.insert( "RecInputMix", SOUND_MIXER_IMIX );
         if ( devmask & ( 1 << SOUND_MIXER_ALTPCM ) )    _channels.insert( "RecAltPCM", SOUND_MIXER_ALTPCM );
         if ( devmask & ( 1 << SOUND_MIXER_RECLEV ) )    _channels.insert( "RecRecord", SOUND_MIXER_RECLEV );
         if ( devmask & ( 1 << SOUND_MIXER_IGAIN ) )     _channels.insert( "RecInputGain", SOUND_MIXER_IGAIN );
         if ( devmask & ( 1 << SOUND_MIXER_OGAIN ) )     _channels.insert( "RecOutputGain", SOUND_MIXER_OGAIN );
         //odebug << "recmask available and constructed." << oendl;
     }
 
+    devmask = 0;
+    if ( ioctl( _fd, SOUND_MIXER_READ_STEREODEVS, &devmask ) != -1 )
+    {
+        odebug << "stereomask = " << devmask << oendl;
+    }
+
 /*    ChannelIterator it;
     for ( it = _channels.begin(); it != _channels.end(); ++it )
     {
         odebug << "Channel " <<  it.key() << " available (bit " << it.data() << ")" << oendl;
         odebug << " +--- Volume: " << volume( it.key() ) & 0xff << " | " << volume( it.key() ) >> 8 << "" << oendl;
     }
 */
 }
 
 QStringList OMixerInterface::allChannels() const
 {
     ChannelIterator it = _channels.begin();
     QStringList channels;
     while ( it != _channels.end() )
     {
         channels += it.key();
         it++;
     }
     return channels;
 }
 
 
 QStringList OMixerInterface::recChannels() const
 {
     owarn << "NYI" << oendl;
     return QStringList();
 }
 
 
 QStringList OMixerInterface::playChannels() const
 {
     owarn << "NYI" << oendl;
     return QStringList();
 }
 
 
-bool OMixerInterface::hasChannel( const QString& channel )
+bool OMixerInterface::hasChannel( const QString& channel ) const
 {
     return _channels.contains( channel );
 }
 
 
+bool OMixerInterface::isStereo( const QString& channel ) const
+{
+    bool result = false;
+    if ( _channels.contains( channel ) )
+    {
+        int devmask = 0;
+        if ( ioctl( _fd, SOUND_MIXER_READ_STEREODEVS, &devmask ) != -1 )
+        {
+            result = devmask & ( 1 << _channels[channel] );
+        }
+    }
+    return result;
+}
+
+
 void OMixerInterface::setVolume( const QString& channel, int left, int right )
 {
     int volume = left;
     volume |= ( right == -1 ) ? left << 8 : right << 8;
 
     if ( _channels.contains( channel ) )
     {
         int result = ioctl( _fd, MIXER_WRITE( _channels[channel] ), &volume );
         if ( result == -1 )
         {
             owarn << "Can't set volume: " << strerror( errno ) << oendl;
         }
         else
         {
             if ( result & 0xff != left )
             {
                 owarn << "Device adjusted volume from " << left << " to " << (result & 0xff) << oendl;
             }
         }
     }
 }
 
 
 int OMixerInterface::volume( const QString& channel ) const
 {
     int volume;
 
     if ( _channels.contains( channel ) )
     {
         if ( ioctl( _fd, MIXER_READ( _channels[channel] ), &volume ) == -1 )
         {
             owarn << "Can't get volume: " << strerror( errno ) << oendl;
         }
         else return volume;
     }
     return -1;
 }
diff --git a/libopie2/opiemm/osoundsystem.h b/libopie2/opiemm/osoundsystem.h
index bd69114..ac7a5a7 100644
--- a/libopie2/opiemm/osoundsystem.h
+++ b/libopie2/opiemm/osoundsystem.h
@@ -141,92 +141,96 @@ class OSoundCard : public QObject
 class OAudioInterface : public QObject
 {
   Q_OBJECT
 
   public:
     /**
      * Constructor. Normally you don't create @ref OAudioInterface objects yourself,
      * but access them via the @ref OSoundCard interface.
      */
     OAudioInterface( QObject* parent, const char* name );
     /**
      * Destructor.
      */
     virtual ~OAudioInterface();
 
   protected:
     const int _sfd;
 
   private:
     void init();
   private:
     class Private;
     Private *d;
 };
 
 
 /*======================================================================================
  * OMixerInterface
  *======================================================================================*/
 
 class OMixerInterface : public QObject
 {
   Q_OBJECT
 
   public:
 
     typedef QMap<QString,int>::ConstIterator ChannelIterator;
 
     /**
      * Constructor. Normally you don't create @ref OMixerInterface objects yourself,
      * but access them via the @ref OSoundCard interface.
      */
     OMixerInterface( QObject* parent, const char* name );
     /**
      * Destructor.
      */
     virtual ~OMixerInterface();
 
     /**
      * @returns all available channels.
      */
     QStringList allChannels() const;
     /**
      * @returns recordable channels.
      */
     QStringList recChannels() const;
     /**
      * @returns playable channels.
      */
     QStringList playChannels() const;
 
     /**
      * @returns true, if @a channel exists.
      */
-    bool hasChannel( const QString& channel );
+    bool hasChannel( const QString& channel ) const;
+    /**
+     * @returns true, if @a channel is stereo.
+     */
+    bool isStereo( const QString& channel ) const;
 
     /**
      * Set the @a left and @a right volumes for @a channel.
      * If no value for right is given, the value for left is taken for that.
      */
     void setVolume( const QString& channel, int left, int right = -1 );
     /**
      * @returns the volume of @a channel or -1, if the channel doesn't exist.
      * @note You might want to use @ref hasChannel() to check if a channel exists.
      */
     int volume( const QString& channel ) const;
 
   protected:
     int _fd;
     QMap<QString, int> _channels;
 
   private:
     void init();
   private:
     class Private;
     Private *d;
 };
 
 }
 }
 
 #endif // OSOUNDSYSTEM_H