Rivendellaudio/rdhpi/rdhpiplaystream.cpp

//   rdhpiplaystream.cpp
//
//   A class for playing Microsoft WAV files.
//
//   (C) Copyright 2002-2007 Fred Gleason <fredg@paravelsystems.com>
//
//    $Id: rdhpiplaystream.cpp,v 1.8.6.1 2012/05/04 14:56:22 cvs Exp $
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License version 2 as
//   published by the Free Software Foundation.
//
//   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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
//

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>
#include <fcntl.h>
#include <qobject.h>
#include <qwidget.h>
#include <qstring.h>
#include <qdatetime.h>

#include <rd.h>
#include <rdhpiplaystream.h>
#include <rdhpisoundcard.h>

#define RDHPIPLAYSTREAM_USE_LOCAL_MUTEX

#ifdef RDHPIPLAYSTREAM_USE_LOCAL_MUTEX
volatile static int stream_mutex[HPI_MAX_ADAPTERS][HPI_MAX_STREAMS]=
  {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
#endif


RDHPIPlayStream::RDHPIPlayStream(RDHPISoundCard *card,
			       QWidget *parent,const char *name) 
  :QObject(parent,name),RDWaveFile()
{  
  //  hpi_err_t hpi_err;
  int quan;
  uint16_t type[HPI_MAX_ADAPTERS];

  sound_card=card;
  card_number=-1;
  stream_number=-1;
  is_open=false;
  playing=false;
  is_paused=false;
  repositioned=false;
  stopping=false;
  samples_skipped=0;
  play_length=0;
  play_speed=1000;
  pitch_can_vary=false;
  rate_can_vary=false;
  stream_state=RDHPIPlayStream::Stopped;
  pdata=NULL;
  restart_transport=false;
  samples_pending=0;
  current_position=0;

  //
  // Get Adapter Indices
  //
#if HPI_VER < 0x00030600
  for(unsigned i=0;i<HPI_MAX_ADAPTERS;i++) {
    card_index[i]=i;
  }
#else
  LogHpi(HPI_SubSysGetNumAdapters(NULL,&quan));
  for(int i=0;i<quan;i++) {
    LogHpi(HPI_SubSysGetAdapter(NULL,i,card_index+i,type+i));
  }
#endif  // HPI_VER

  clock=new QTimer(this,"clock");
  connect(clock,SIGNAL(timeout()),this,SLOT(tickClock()));

  play_timer=new QTimer(this,"play_timer");
  connect(play_timer,SIGNAL(timeout()),this,SLOT(pause()));
}


RDHPIPlayStream::~RDHPIPlayStream()
{
  if(is_open) {
    closeWave();
  }
  if(pdata!=NULL) {
    delete pdata;
  }
  delete clock;
  delete play_timer;
}


QString RDHPIPlayStream::errorString(RDHPIPlayStream::Error err)
{
  QString str;

  switch(err) {
      case RDHPIPlayStream::Ok:
	return QString(tr("Ok"));
	break;

      case RDHPIPlayStream::NoFile:
	return QString(tr("No such file or directory"));
	break;

      case RDHPIPlayStream::NoStream:
	return QString(tr("No output stream available"));
	break;

      case RDHPIPlayStream::AlreadyOpen:
	return QString(tr("Stream is already open"));
	break;

      default:
	str=QString(tr("Unknown Error:"));
	return QString().sprintf("%s %d\n",(const char *)str,err);
	break;
  }
}


bool RDHPIPlayStream::formatSupported(RDWaveFile::Format format)
{
#if HPI_VER < 0x30A00
  HPI_FORMAT hpi_format;
#else
  struct hpi_format hpi_format;
#endif
  hpi_handle_t hostream;
  bool found=false;

  if(card_number<0) {
    return false;
  }
  if(format==RDWaveFile::Vorbis) {
#ifdef HAVE_VORBIS
    return true;
#endif  // HAVE_VORBIS
    return false;
  }
  if(!is_open) {
    for(int i=0;i<sound_card->getCardOutputStreams(card_number);i++) {
      if(HPI_OutStreamOpen(NULL,card_index[card_number],i,&hostream)==0) {
	found=true;
	break;
      }
    }
    if(!found) {
      return false;
    }
  }
  else {
    hostream=hpi_stream;
  }
  switch(format) {
      case RDWaveFile::Pcm16:
	LogHpi(HPI_FormatCreate(&hpi_format,getChannels(),
				HPI_FORMAT_PCM16_SIGNED,
				getSamplesPerSec(),getHeadBitRate(),0));
	state=HPI_OutStreamQueryFormat(NULL,hostream,&hpi_format);
	break;

      case RDWaveFile::Pcm24:
	LogHpi(HPI_FormatCreate(&hpi_format,getChannels(),
				HPI_FORMAT_PCM24_SIGNED,
				getSamplesPerSec(),getHeadBitRate(),0));
	state=HPI_OutStreamQueryFormat(NULL,hostream,&hpi_format);
	break;

      case RDWaveFile::MpegL1:
	LogHpi(HPI_FormatCreate(&hpi_format,getChannels(),
				HPI_FORMAT_MPEG_L1,
				getSamplesPerSec(),getHeadBitRate(),0));
	state=HPI_OutStreamQueryFormat(NULL,hostream,&hpi_format);
	break;

      case RDWaveFile::MpegL2:
	LogHpi(HPI_FormatCreate(&hpi_format,getChannels(),
				HPI_FORMAT_MPEG_L2,
				getSamplesPerSec(),getHeadBitRate(),0));
	state=HPI_OutStreamQueryFormat(NULL,hostream,&hpi_format);
	break;;

      case RDWaveFile::MpegL3:
	LogHpi(HPI_FormatCreate(&hpi_format,getChannels(),
				HPI_FORMAT_MPEG_L3,
				getSamplesPerSec(),getHeadBitRate(),0));
	state=HPI_OutStreamQueryFormat(NULL,hostream,&hpi_format);
	break;

      default:
	state=1;
	break;
  }
  if(!is_open) {
    LogHpi(HPI_OutStreamClose(NULL,hostream));
  }
  if(state!=0) {
    return false;
  }
  return true;
}


bool RDHPIPlayStream::formatSupported()
{
  switch(getFormatTag()) {
      case WAVE_FORMAT_PCM:
	switch(getBitsPerSample()) {
	    case 8:
	      return formatSupported(RDWaveFile::Pcm8);
	      break;

	    case 16:
	      return formatSupported(RDWaveFile::Pcm16);
	      break;

	    case 24:
	      return formatSupported(RDWaveFile::Pcm24);
	      break;

	    default:
	      return false;
	}
	break;

      case WAVE_FORMAT_MPEG:
	switch(getHeadLayer()) {
	    case 1:
	      return formatSupported(RDWaveFile::MpegL1);
	      break;

	    case 2:
	      return formatSupported(RDWaveFile::MpegL2);
	      break;

	    case 3:
	      return formatSupported(RDWaveFile::MpegL3);
	      break;

	    default:
	      return false;
	}
	break;

      default:
	return false;
  }
}


RDHPIPlayStream::Error RDHPIPlayStream::openWave()
{
  if(is_open) {
    return RDHPIPlayStream::AlreadyOpen;
  }
  nameWave(wave_name);
  samples_skipped=0;
  samples_pending=0;
  if(!RDWaveFile::openWave()) {
    return RDHPIPlayStream::NoFile;
  }
  if(GetStream()<0) {
    RDWaveFile::closeWave();
    return RDHPIPlayStream::NoStream;
  }
  is_open=true;
  return RDHPIPlayStream::Ok;
}


RDHPIPlayStream::Error RDHPIPlayStream::openWave(QString file_name)
{
  if(is_open) {
    return RDHPIPlayStream::AlreadyOpen;
  }
  wave_name=file_name;
  return openWave();
}



void RDHPIPlayStream::closeWave()
{
  if(!is_open) {
    return;
  }
  if(playing||is_paused) {
    stop();
  }
  FreeStream();
  RDWaveFile::closeWave();
  is_open=false;
}


int RDHPIPlayStream::getCard() const
{
  return card_number;
}


void RDHPIPlayStream::setCard(int card)
{
  if(!playing) {
    card_number=card;
  }
}


int RDHPIPlayStream::getStream() const
{
  return stream_number;
}


int RDHPIPlayStream::getSpeed() const
{
  return play_speed;
}


bool RDHPIPlayStream::setSpeed(int speed,bool pitch,bool rate)
{
  if(speed!=RD_TIMESCALE_DIVISOR) {
    if(!pitch) {
      if(!sound_card->haveTimescaling(card_number)) {
	return false;
      }
      if((speed<TIMESCALE_LOW_LIMIT)||(speed>TIMESCALE_HIGH_LIMIT)) {
	return false;
      }
    }
    else {
      if(!rate) {    // Variable speed with resampling not yet supported!
	return false;
      }
      if((speed<96000)||(speed>104000)) {  // Max variation +/- 4%
	return false;
      }
    }
  }
  play_speed=speed;
  pitch_can_vary=pitch;
  rate_can_vary=rate;
  return true;
}


RDHPIPlayStream::State RDHPIPlayStream::getState() const
{
  return stream_state;
}


bool RDHPIPlayStream::play()
{
#ifdef RPLAYSTREAM_SHOW_SLOTS
  printf("play() -- Card: %d  Stream: %d\n",card_number,stream_number);
#endif  // RPLAYSTREAM_SHOW_SLOTS
  syslog(LOG_ERR,"Play - 1\n");
  if(!is_open) {
    return false;
  }
  if((!playing)&&(!is_paused)) {
    LogHpi(HPI_OutStreamSetTimeScale(NULL,hpi_stream,
			(uint16_t)((RD_TIMESCALE_DIVISOR/(double)play_speed)*
				   HPI_OSTREAM_TIMESCALE_UNITS)));
    if(HPI_OutStreamGetInfoEx(NULL,hpi_stream,
			      &state,&buffer_size,&data_to_play,
			      &samples_played,&reserved)!=0) {
      return false;
    }
    fragment_size=buffer_size/4;
    if(fragment_size>MAX_FRAGMENT_SIZE) {
      fragment_size=MAX_FRAGMENT_SIZE;
    }
    if(pdata!=NULL) {
      delete pdata;
    }
    pdata=(uint8_t *)malloc(fragment_size);
    if(pdata==NULL) {
      return false;
    }
    switch(getFormatTag()) {
	case WAVE_FORMAT_PCM:
	case WAVE_FORMAT_VORBIS:
	  switch(getBitsPerSample()) {
	      case 8:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_PCM8_UNSIGNED,
					getSamplesPerSec(),0,0));
		break;
	      case 16:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_PCM16_SIGNED,
					getSamplesPerSec(),0,0));
		break;
	      case 24:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_PCM24_SIGNED,
					getSamplesPerSec(),0,0));
		break;
	      case 32:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_PCM32_SIGNED,
					getSamplesPerSec(),0,0));
		break;
	      default:
		LogHpi(HPI_AdapterClose(NULL,card_index[card_number]));
		return false;
		break;
	  }
	  break;
	case WAVE_FORMAT_MPEG:
	  switch(getHeadLayer()) {
	      case 1:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_MPEG_L1,getSamplesPerSec(),
					getHeadBitRate(),getHeadFlags()));
		break;
	      case 2:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_MPEG_L2,getSamplesPerSec(),
					getHeadBitRate(),getHeadFlags()));
		break;
	      case 3:
		LogHpi(HPI_FormatCreate(&format,getChannels(),
					HPI_FORMAT_MPEG_L3,getSamplesPerSec(),
					getHeadBitRate(),getHeadFlags()));
		break;
	      default:
		LogHpi(HPI_AdapterClose(NULL,card_index[card_number]));
		return false;
	  }
	  break;
	default:
	  return false;
    }
#if HPI_VER < 0x00030500
    if(HPI_DataCreate(&hpi_data,&format,pdata,fragment_size)!=0) {
      return false;
    }
#endif
  }
   if(!is_paused) {
    memset(pdata,0,fragment_size);
    left_to_write=getDataLength()-seekWave(0,SEEK_CUR);
    if(left_to_write<fragment_size) {
      read_bytes = left_to_write;
      left_to_write=0;
      stopping=true;
    }
    else {
      read_bytes=fragment_size;
      left_to_write-=fragment_size;
    }
    readWave(pdata,read_bytes);
#if HPI_VER > 0x00030500
    LogHpi(HPI_OutStreamWriteBuf(NULL,hpi_stream,pdata,read_bytes,&format));
#else
    LogHpi(HPI_DataCreate(&hpi_data,&format,pdata,read_bytes));
    LogHpi(HPI_OutStreamWrite(NULL,hpi_stream,&hpi_data));
#endif
    if(HPI_OutStreamStart(NULL,hpi_stream)!=0) {
      return false;
    }
    clock->start(50);
    clock->start(FRAGMENT_TIME);
    playing=true;
    is_paused=false;
    stopping=false;
    if(play_length>0) {
      play_timer->start(play_length,true);
      start_time=QTime::currentTime();
    }
    stream_state=RDHPIPlayStream::Playing;
    if(!restart_transport) {
      emit isStopped(false);
      emit played();
      emit stateChanged(card_number,stream_number,(int)stream_state);
    }
  }
  if((!playing)&(is_paused|repositioned)) {
    LogHpi(HPI_OutStreamStart(NULL,hpi_stream));
    clock->start(FRAGMENT_TIME);
    playing=true;
    stopping=false;
    is_paused=false;
    stream_state=RDHPIPlayStream::Playing;
    if(!restart_transport) {
      emit isStopped(false);
      emit played();
      emit stateChanged(card_number,stream_number,(int)stream_state);
    }
  }      
  return true;
}


void RDHPIPlayStream::pause()
{
#ifdef RPLAYSTREAM_SHOW_SLOTS
  printf("pause() -- Card: %d  Stream: %d\n",card_number,stream_number);
#endif  // RPLAYSTREAM_SHOW_SLOTS
  uint16_t state;
  uint32_t buffer_size;
  uint32_t data_to_play;
  uint32_t reserved;

  if(!is_open) {
    return;
  }
  if(playing) {
    LogHpi(HPI_OutStreamStop(NULL,hpi_stream));
    clock->stop();
    LogHpi(HPI_OutStreamGetInfoEx(NULL,hpi_stream,&state,&buffer_size,
				  &data_to_play,&samples_played,&reserved));
    switch(getFormatTag()) {
	case WAVE_FORMAT_PCM:
	  samples_pending=data_to_play/(getChannels()*getBitsPerSample()/8);
	  break;

	case WAVE_FORMAT_MPEG:
	  samples_pending=
	    1152*data_to_play/(144*getHeadBitRate()/getSamplesPerSec());
	  break;
    }
    playing=false;
    is_paused=true;
    stream_state=RDHPIPlayStream::Paused;
    if(!restart_transport) {
      emit paused();
      emit stateChanged(card_number,stream_number,(int)stream_state);
    }
  }
}



void RDHPIPlayStream::stop()
{
#ifdef RPLAYSTREAM_SHOW_SLOTS

  printf("stop() -- Card: %d  Stream: %d\n",card_number,stream_number);
#endif  // RPLAYSTREAM_SHOW_SLOTS

  if(!is_open) {
    return;
  }
  if(playing|is_paused) {
    LogHpi(HPI_OutStreamStop(NULL,hpi_stream));
    clock->stop();
    playing=false;
    is_paused=false;
    seekWave(0,SEEK_SET);
    LogHpi(HPI_OutStreamReset(NULL,hpi_stream));
    samples_pending=0;
    samples_skipped=0;
    stream_state=RDHPIPlayStream::Stopped;
    current_position=0;
    if(pdata!=NULL) {
      delete pdata;
      pdata=NULL;
    }
    if(!restart_transport) {
      emit position(0);
      emit isStopped(true);
      emit stopped();
      emit stateChanged(card_number,stream_number,0);
    }
  }
}


int RDHPIPlayStream::currentPosition()
{
  if(current_position!=samples_played+samples_skipped) {
    current_position=samples_played+samples_skipped;
  }
  return samples_played+samples_skipped;
}


bool RDHPIPlayStream::setPosition(unsigned samples)
{
#ifdef RPLAYSTREAM_SHOW_SLOTS
  printf("setPosition(%d) -- Card: %d  Stream: %d\n",samples,
	 card_number,stream_number);
#endif  // RPLAYSTREAM_SHOW_SLOTS
  if((samples<0)||(samples>getSampleLength())) {
    return false;
  }
  if(playing&&((unsigned)samples!=(samples_skipped+samples_played))) {
    restart_transport=true;
    pause();
  }
  
  if(!playing) {
    if(is_paused) {
      is_paused=false;
      repositioned=true;
    }
    LogHpi(HPI_OutStreamReset(NULL,hpi_stream));
    samples_played=0;
    switch(getFormatTag()) {
	case WAVE_FORMAT_PCM:
	case WAVE_FORMAT_VORBIS:
	  samples_skipped=
	    (unsigned)((double)getBlockAlign()*
		       ((double)samples/(double)getBlockAlign()));
	  seekWave((int)((double)samples_skipped*(double)getBlockAlign()),
		   SEEK_SET);
	  break;
	case WAVE_FORMAT_MPEG:
	  samples_skipped=
	    (unsigned)((double)getBlockAlign()*
		       ((double)samples/(double)getBlockAlign()));
	  seekWave((int)((double)(getAvgBytesPerSec())*
			   ((double)(samples_skipped)/
			    ((double)getSamplesPerSec()))),
		   SEEK_SET);
	  break;
    }
    emit position(samples);
  }
  if(restart_transport) {
    play();
    restart_transport=false;
  }
  return true;
}


void RDHPIPlayStream::setPlayLength(int length)
{
  int diff;

  if(play_timer->isActive()) {
    QTime current_time=QTime::currentTime();
    if((diff=length-start_time.msecsTo(current_time))<=0) {
      diff=0;
    }
    play_timer->changeInterval(diff);
    start_time=current_time;
  }
  play_length=length;
}


void RDHPIPlayStream::tickClock()
{
  static int count=0;
  hpi_err_t hpi_err;
  char hpi_text[100];
  int n;

  hpi_err=HPI_OutStreamGetInfoEx(NULL,hpi_stream,
				 &state,&buffer_size,&data_to_play,
				 &samples_played,&reserved);
  if(!stopping) {
    while((buffer_size-data_to_play)>=fragment_size) {
      n=readWave(pdata,fragment_size);
      if((n<=0)||(((uint32_t)n)<fragment_size)) {
	// End of file
#if HPI_VER > 0x00030500
	if((hpi_err=HPI_OutStreamWriteBuf(NULL,hpi_stream,
				       pdata,n,&format))!=0) {
	  HPI_GetErrorText(hpi_err,hpi_text);
	  fprintf(stderr,"*** HPI Error: %s ***\n",hpi_text);
	}
#else
	HPI_DataCreate(&hpi_data,&format,pdata,n);
	if((hpi_err=HPI_OutStreamWrite(NULL,hpi_stream,
				       &hpi_data))!=0) {
	  HPI_GetErrorText(hpi_err,hpi_text);
	  fprintf(stderr,"*** HPI Error: %s ***\n",hpi_text);
	}
#endif
	left_to_write=0;
	stopping=true;
	return;
      }
      left_to_write-=n;
#if HPI_VER > 0x00030500
      hpi_err=HPI_OutStreamWriteBuf(NULL,hpi_stream,
				    pdata,n,&format);
#else
      hpi_err=HPI_DataCreate(&hpi_data,&format,pdata,n);
      hpi_err=HPI_OutStreamWrite(NULL,hpi_stream,&hpi_data);
#endif
      hpi_err=HPI_OutStreamGetInfoEx(NULL,hpi_stream,
				     &state,&buffer_size,&data_to_play,
				     &samples_played,&reserved);
    }
  }
  else {
    if(state==HPI_STATE_DRAINED) {
      hpi_err=HPI_OutStreamStop(NULL,hpi_stream);
      hpi_err=HPI_OutStreamClose(NULL,hpi_stream);
      hpi_err=HPI_AdapterClose(NULL,card_index[card_number]);
      clock->stop();
      playing=false;
      seekWave(0,SEEK_SET);
      hpi_err=HPI_OutStreamReset(NULL,hpi_stream);
      samples_pending=0;
      samples_skipped=0;
      stream_state=RDHPIPlayStream::Stopped;
      emit position(0);
      emit isStopped(true);
      emit stopped();
      emit stateChanged(card_number,stream_number,(int)stream_state);
      return;
    }
  }
  if(count++==2) {
    count=0;
    emit position(samples_played+samples_skipped);
  }
}


void RDHPIPlayStream::Drained()
{
}


int RDHPIPlayStream::GetStream()
{
#ifdef RDHPIPLAYSTREAM_USE_LOCAL_MUTEX
  for(int i=0;i<sound_card->getCardOutputStreams(card_number);i++) {
    if(++stream_mutex[card_number][i]==1) {
      LogHpi(HPI_OutStreamOpen(NULL,card_index[card_number],i,&hpi_stream));
      stream_number=i;
      return stream_number;
    }
    else {
      stream_mutex[card_number][i]--;
    }
  }
  return -1;
#else
  for(int i=0;i<sound_card->getCardOutputStreams(card_number);i++) {
    if(HPI_OutStreamOpen(NULL,card_index[card_number],i,&hpi_stream)==0) {
      stream_number=i;
//      syslog(LOG_ERR,"HPI allocating ostream: %d",stream_number);
      return stream_number;
    }
  }
  return -1;
#endif
}


void RDHPIPlayStream::FreeStream()
{
#ifdef RDHPIPLAYSTREAM_USE_LOCAL_MUTEX
  stream_mutex[card_number][stream_number]--;
  LogHpi(HPI_OutStreamClose(NULL,hpi_stream));
  stream_number=-1;
#else
  LogHpi(HPI_OutStreamClose(NULL,hpi_stream));
//  syslog(LOG_ERR,"HPI closing ostream: %d",stream_number);
  stream_number=-1;
#endif
}


hpi_err_t RDHPIPlayStream::LogHpi(hpi_err_t err)
{
  char err_txt[200];

  if(err!=0) {
    HPI_GetErrorText(err,err_txt);
    syslog(LOG_NOTICE,"HPI Error: %s",err_txt);
  }
  return err;
}