libGizmod/AlsaSoundCard.hpp

Go to the documentation of this file.

/*
  
  Copyright (c) 2007, Tim Burrell
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at 

        http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and 
  limitations under the License. 
  
*/

#ifndef __AlsaSoundCard_h
#define __AlsaSoundCard_h

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include "AlsaInterface.hpp"
#include "AlsaSoundCardInterface.hpp"
#include "AlsaMixer.hpp"
#include <string>
#include <map>
#include <boost/shared_ptr.hpp>
#include <alsa/asoundlib.h>

// Namespace

namespace Gizmod {

// AlsaSoundCard Class Definition

class AlsaSoundCard : public AlsaSoundCardInterface {
public: 
        // public member variables
        
        // public functions
        std::string                     getCardHardwareID() const;      
        int                             getCardID() const;              
        std::string                     getCardName() const;            
        std::string                     getCardNameLong() const;        
        AlsaMixer const *               getMixer(std::string Name);     
        size_t                          getNumMixers();                 
        void                            setAllPlaybackSwitches(bool Enabled); 
        void                            shutdown();                     

        // construction / deconstruction
        AlsaSoundCard(AlsaInterface * piAlsa, int CardID);
        virtual ~AlsaSoundCard();
        
        // public static functions
        static int                      MixerCallback(snd_mixer_t * Mixer, unsigned int EventMask, snd_mixer_elem_t * MixerElement); 
        
private:
        // private functions
        void                            init();                         
        int                             mixerCallback(snd_mixer_t * Mixer, unsigned int EventMask, snd_mixer_elem_t * MixerElement); 
        void                            threadProc();                   
                
        // private member variables
        int                             mCardID;                        
        std::string                     mCardHWID;                      
        std::string                     mCardName;                      
        std::string                     mCardNameLong;                  
        snd_ctl_t *                     mCTLHandle;                     
        snd_ctl_card_info_t *           mHWInfo;                        
        snd_mixer_t *                   mMixerHandle;                   
        std::map< std::string, boost::shared_ptr<AlsaMixer> > mMixers;  
        bool                            mShutdown;                      
        bool                            mWatching;                      

        struct AlsaSoundCardThreadProc {
                AlsaSoundCardThreadProc(AlsaSoundCard * pAlsaSoundCard) : mpAlsaSoundCard(pAlsaSoundCard) {
                        mpAlsaSoundCard->mThreading = false;
                };
                
                void operator()() {
                        mpAlsaSoundCard->mThreading = true;
                        mpAlsaSoundCard->threadProc();
                        mpAlsaSoundCard->mThreading = false;
                }
                
                AlsaSoundCard *         mpAlsaSoundCard;                
        };              
        bool                            mThreading;                     
        AlsaSoundCardThreadProc         mThreadProc;                    
        
private: 
        // serialization
        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, const unsigned int version) {
                ar & mCardID;
                ar & mCardHWID;
                ar & mCardName;
                ar & mCardNameLong;
        }                               
};


} // Gizmod namespace

#endif // __AlsaSoundCard_h

---