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File.cpp

// HamFax -- an application for sending and receiving amateur radio facsimiles
// Copyright (C) 2001,2002
// Christof Schmitt, DH1CS <cschmitt@users.sourceforge.net>
//  
// 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 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.

#include "File.hpp"
#include "Error.hpp"

File::File(QObject* parent)
      : QObject(parent), aFile(0)
{
      afSetErrorHandler(0);
      timer=new QTimer(this);
}

File::~File(void)
{
      end();
}

int File::startOutput(const QString& fileName)
{
      try {
            AFfilesetup fs;
            if((fs=afNewFileSetup())==AF_NULL_FILESETUP) {
                  throw Error(tr("could not allocate AFfilesetup"));
            }
            afInitFileFormat(fs,AF_FILE_NEXTSND);
            afInitSampleFormat(fs,AF_DEFAULT_TRACK,AF_SAMPFMT_TWOSCOMP,16);
            afInitByteOrder(fs,AF_DEFAULT_TRACK,AF_BYTEORDER_BIGENDIAN);
            afInitChannels(fs,AF_DEFAULT_TRACK,1);
            afInitRate(fs,AF_DEFAULT_TRACK,8000);
            
            if((aFile=afOpenFile(fileName,"w",fs))==AF_NULL_FILEHANDLE) {
                  aFile=0;
                  throw Error(tr("could not open file"));
            }
            afFreeFileSetup(fs);
            timer->start(0);
            connect(timer,SIGNAL(timeout()),this,SLOT(timerSignal()));
      } catch(Error) {
            end();
            throw;
      }
      return 8000;
}

int File::startInput(const QString& fileName)
{
      try {
            AFfilesetup fs=0;
            if((aFile=afOpenFile(fileName,"r",fs))==AF_NULL_FILEHANDLE) {
                  throw Error(tr("could not open file"));
            }
            if(afGetFrameSize(aFile,AF_DEFAULT_TRACK,0)!=2) {
                  throw Error(tr("samples size not 16 bit"));
            }
            if(afGetRate(aFile,AF_DEFAULT_TRACK)!=8000) {
                  throw Error(tr("sample rate is not 8000 Hz"));
            }
            timer->start(0);
            connect(timer,SIGNAL(timeout()),this,SLOT(read()));
      } catch(Error) {
            end();
            throw;
      }
      return 8000;
}

void File::end(void)
{
      timer->stop();
      disconnect(timer,SIGNAL(timeout()),this,SLOT(timerSignal()));
      if(aFile!=0) {
            afCloseFile(aFile);
            aFile=0;
            emit deviceClosed();
      }
}

void File::write(short* samples, int number)
{
      if(aFile!=0) {
            if((afWriteFrames(aFile,AF_DEFAULT_TRACK,samples,number))
               !=blockSize) {
                  end();
                  }
      }
}

void File::read(void)
{
      int n=blockSize;
      short buffer[n];
      n=afReadFrames(aFile,AF_DEFAULT_TRACK,buffer,n);
      emit data(buffer,n);
}

void File::timerSignal(void)
{
      emit next(blockSize);
}

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