audiosource.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_SOURCE_H
#define AUDIO_SOURCE_H

#include <QAudioFormat> 
#include <QAudio> // type definitions 
#include <QByteArray> 
#include <QTimer>
#include <QIODevice>

class QAudioInput ;
class Model ; 

class AudioSource : public QIODevice {
    Q_OBJECT

public:
    AudioSource(Model& aModel) ;
    ~AudioSource() ;
    quint32 getCurrentSeqNo() const { return iSeqNo ; } ; 
    void stopCapturing() ; 
// next methods inherited from QIODevice:
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, 
    }
    void timerEvent(QTimerEvent *event);
signals:
    void frameCaptured(const QByteArray& aFrame,
                       quint32 aSeqNo,
                       float aVolumeLevel) ;
    void audioMaxLevel(float aMaxVolume) ; 
public slots:
    void processCapturedAudio() ; 
  void inputStatusChanged(QAudio::State aState) ; 
private: // members
    QAudioFormat iFormat;
    QAudioInput* iAudioInput ; 
    QByteArray iAudioBuffer ; 
    quint32 iSeqNo ; 
    bool iNeedsToRun ; 
    Model& iModel ; 
    int iTimerId ; 
} ;
#endif