audioplayer.h

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/* -*-C++-*- -*-coding: utf-8-unix;-*-
   Classified Ads is Copyright (c) Antti Järvinen 2015.

  This file is part of Classified Ads.

  Classified Ads is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  Classified Ads 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with Classified Ads; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AUDIO_PLAYER_H
#define AUDIO_PLAYER_H

#include <QObject>
#include <QByteArray>
#include <QAudioOutput>
#include <QIODevice>

class Model ; 

class AudioPlayer : public QIODevice {
    Q_OBJECT

public:
    AudioPlayer(Model& aModel,
                int aFrequency = 8000,
                int aNumChannels = 1,
                int aSampleSize = 16 ) ;
    ~AudioPlayer() ;
    void stop() ; 
// next methods inherited from QIODevice:
public: 
    virtual qint64 bytesAvailable () const {
        return iAudioBuffer.size() + QIODevice::bytesAvailable(); 
    }
protected:
    virtual qint64 writeData ( const char * data, qint64 maxSize ) ;
    virtual qint64 readData ( char * data, qint64 maxSize ) ;
    virtual bool open ( OpenMode mode ) ;
    /*
     * method for opening QIODevice: tells that this is no random-access
     * device.
     *
     * @return true always 
     */
    virtual bool isSequential () const {
        return true ; // is not random-access, 
    }
signals:
    void error(int aError,
               const QString& aExplanation) ;
    void audioMaxLevel(float aMaxVolume) ; 
public slots:
    void insertAudioFrame ( const QByteArray& aFrame ); 

    void finishedPlaying ( QAudio::State aState ); 

    void notify() ;

private: // members
    QAudioFormat iFormat;
    QAudioOutput* iAudioOutput ; 
    QByteArray iAudioBuffer ; 
    bool iNeedsToRun ;
    Model& iModel ; 
    const int iFrequency ; 
    const int iNumChannels ;
    const int iSampleSize ; 
} ;
#endif