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[wxWidgets.git] / src / gtk / wave.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        wave.cpp
// Purpose:     wxWave
// Author:      Marcel Rasche
// Modified by:
// Created:     25/10/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "wave.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if defined(__BORLANDC__)
#pragma hdrstop
#endif

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/soundcard.h>

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/file.h"
#include "wx/wave.h"


wxWave::wxWave()
  : m_waveLength(0), m_isResource(FALSE), m_waveData(NULL)
{
}

wxWave::wxWave(const wxString& sFileName, bool isResource)
  : m_waveLength(0), m_isResource(isResource), m_waveData(NULL)
{
  Create(sFileName, isResource);
}

wxWave::wxWave(int size, const byte* data)
  : m_waveLength(0), m_isResource(FALSE), m_waveData(NULL)
{
  Create(size, data);
}

wxWave::~wxWave()
{
  Free();
}

bool wxWave::Create(const wxString& fileName, bool isResource)
{
  Free();
  
  if (isResource)
  {
    //  todo

    return (m_waveData ? TRUE : FALSE);
  }
  else
  {
    m_isResource = FALSE;

    wxFile fileWave;
    if (!fileWave.Open(fileName, wxFile::read))
      return FALSE;

    m_waveLength = (int) fileWave.Length();
    
    m_waveData = new byte[m_waveLength];
    if (!m_waveData)
      return FALSE;
    
    fileWave.Read(m_waveData, m_waveLength);
    
    return TRUE;
  }
}

bool wxWave::Create(int size, const byte* data)
{
  Free();
  m_isResource = FALSE;
  m_waveLength=size;
  m_waveData = new byte[size];
  if (!m_waveData)
    return FALSE;
  
  for (int i=0; i<size; i++) m_waveData[i] = data[i];
  return TRUE;
}

bool wxWave::Play(bool async, bool looped)
{
  if (!IsOk())
    return FALSE;

  int dev=OpenDSP();
  if(dev<0)
    return FALSE;

  ioctl(dev,SNDCTL_DSP_SYNC,0);
  
  bool play=TRUE;
  int i,l=0;
  do
    {
      i= (int)((l+m_DSPblkSize) < m_sizeData ? m_DSPblkSize : (m_sizeData-l));
      if ( write(dev,&m_data[l],i) != i )
	play=FALSE;
      l +=i;
    }while(play == TRUE && l<m_sizeData);


  close(dev);
  return TRUE;
 
}

bool wxWave::Free()
{
  if (m_waveData)
    {
      delete[] m_waveData;
      m_waveData = NULL;
      m_waveLength = 0;
      return TRUE;
    }
  
  return FALSE;
}

typedef  struct
{ 
  unsigned long   uiSize; 
  unsigned short  uiFormatTag;
  unsigned short  uiChannels;
  unsigned long   ulSamplesPerSec;
  unsigned long   ulAvgBytesPerSec;
  unsigned short  uiBlockAlign;
  unsigned short  uiBitsPerSample;
}WAVEFORMAT;    


#define MONO 1  // and stereo is 2 by wav format
#define WAVE_FORMAT_PCM 1
#define WAVE_INDEX  8
#define FMT_INDEX   12

int wxWave::OpenDSP(void)
{
  wxString str;
  WAVEFORMAT  waveformat;
  int dev=-1;
  unsigned long ul;

  if (m_waveLength < (int)(32+sizeof(WAVEFORMAT)))
    return -1;

  memcpy(&waveformat,&m_waveData[FMT_INDEX+4],sizeof(WAVEFORMAT));

  str= wxString(m_waveData,4);
  if (str != "RIFF")    return -1;
  str= wxString(&m_waveData[WAVE_INDEX],4);
  if (str != "WAVE")    return -1;
  str= wxString(&m_waveData[FMT_INDEX],4);
  if (str != "fmt ")    return -1;
  str= wxString(&m_waveData[FMT_INDEX+waveformat.uiSize+8],4);
  if(str != "data")     return -1;
  memcpy(&ul,&m_waveData[FMT_INDEX+waveformat.uiSize+12],4);
  m_sizeData=ul;
  if ((int)(m_sizeData+FMT_INDEX+waveformat.uiSize+16) != m_waveLength)
    return -1;
  m_data=(char *)(&m_waveData[FMT_INDEX+waveformat.uiSize+8]);

  if (waveformat.uiFormatTag != WAVE_FORMAT_PCM)
    return -1;
  if (waveformat.ulSamplesPerSec != waveformat.ulAvgBytesPerSec/waveformat.uiBlockAlign)
    return -1;
   
  if ((dev = open(AUDIODEV,O_RDWR,0)) <0)
    return -1;
  
  if (!InitDSP(dev,(int)waveformat.uiBitsPerSample,waveformat.uiChannels == MONO ? 0:1,waveformat.ulSamplesPerSec))
    {
      close(dev);
      return -1;
    }

  return dev;
}

bool wxWave::InitDSP(int dev, int iDataBits, int iChannel,unsigned long ulSamplingRate)
{
  if ( ioctl(dev,SNDCTL_DSP_GETBLKSIZE,&m_DSPblkSize) < 0 ) 
    return FALSE;
  if (m_DSPblkSize < 4096 || m_DSPblkSize > 65536)
    return FALSE;
  if ( ioctl(dev,SNDCTL_DSP_SAMPLESIZE,&iDataBits) < 0 )
    return FALSE;
  if ( ioctl(dev,SNDCTL_DSP_STEREO,&iChannel) < 0 )
    return FALSE;
  if ( ioctl(dev,SNDCTL_DSP_SPEED,&ulSamplingRate) < 0 ) 
    return FALSE;
  
  return TRUE;
}