LinuxAudioInputDevice.hh

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/*      
 *  Copyright (C) Massimo Cora' 2006 <maxcvs@email.it>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#ifndef _LINUXAUDIOINPUTDEVICE_H_
#define _LINUXAUDIOINPUTDEVICE_H_


#ifndef _AUDIO_INPUT_DEVICE_HH
#include "AudioInputDevice.hh"
#endif

#include <ffmpeg/avformat.h>
#include <ffmpeg/avcodec.h>

#include "OStreamConfig.hh"

class LinuxAudioInputDevice : public AudioInputDevice
{
public:
        friend class AudioInputDevice;
        
        LinuxAudioInputDevice ( UsageEnvironment& env, int input_port_number,
                                                        unsigned char bits_per_sample,
                                                        unsigned char num_channels,
                                                        unsigned int sampling_frequency,
                                                        unsigned int granularity_in_ms);
        virtual ~LinuxAudioInputDevice ();

protected:      
        

private:                // functions    
        virtual Boolean setInputPort(int port_index);
        
        virtual void doGetNextFrame();
        
        virtual void doStopGettingFrames();
        
        virtual double getAverageLevel() const;

private:                // data 
        const char *_audio_grab_format;
        
        bool _initialized;
        
        AVFormatContext *_format_context;
        
        AVFormatParameters *_ap;
        
        AVInputFormat *_input_fmt;
        
    AVCodec *_pcm_codec;
};


#endif  //_LINUXAUDIOINPUTDEVICE_H_

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