soundout.cpp

2001年度.net程序大赛清华大学作品 网上订票系统

// SoundOut.cpp: implementation of the CSoundOut class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "math.h"
#include "SoundOut.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

#define real double

UINT WaveOutThreadProc(void * pParam);

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CSoundOut::CSoundOut()
{
	int i;

	OutputBuffer = new char[MAX_SIZE_OUTPUT_BUFFER];
	m_NbMaxSamples = MAX_OUTPUT_SAMPLES;
	m_WaveOutSampleRate = 11025;

	for (i = 0 ; i < m_NbMaxSamples; i++)
		OutputBuffer[i] = (SHORT)0;
}

CSoundOut::~CSoundOut()
{
	CloseOutput();
	delete OutputBuffer;
}
///////////////////////////////////////////////////////////////////
MMRESULT CSoundOut::OpenOutput()
{
     MMRESULT result;

    result=waveOutGetNumDevs(); 
	if (result == 0)
	{
        AfxMessageBox("No Sound Output Device");
		return result;
	}

   // test for Mic available   
   result=waveOutGetDevCaps (0, &m_WaveOutDevCaps, sizeof(WAVEOUTCAPS));
   
   if ( result!= MMSYSERR_NOERROR)
   {
       AfxMessageBox(_T("Sound output Cannot determine card capabilities !"));
   }

	// The SoundOut Devive is OK now we can create an Event  and start the Thread
	m_WaveOutEvent = CreateEvent(NULL,FALSE,FALSE,"WaveOutThreadEvent");
	m_TerminateThread = FALSE;
	m_WaveOutThread= AfxBeginThread(WaveOutThreadProc,this,THREAD_PRIORITY_NORMAL,0,CREATE_SUSPENDED,NULL);   
	m_WaveOutThread->m_bAutoDelete = TRUE;
	m_WaveOutThread->ResumeThread();

	// init format 
	WaveInitFormat(1/* mono*/,m_WaveOutSampleRate /* khz */,8 /* bits */); 

	// Open Output 
	result = waveOutOpen( &m_WaveOut,WAVE_MAPPER, &m_WaveFormat,(DWORD)m_WaveOutEvent ,NULL ,CALLBACK_EVENT); 
	if ( result!= MMSYSERR_NOERROR)
	{
        AfxMessageBox(_T("Sound output Cannot Open Device!"));
	    return result;
	}
	// prepare header
	m_SizeRecord = m_NbMaxSamples;
	m_WaveHeader.lpData = (CHAR *)&OutputBuffer[0];
    m_WaveHeader.dwBufferLength = m_SizeRecord*2;
	m_WaveHeader.dwFlags = 0;
	m_WaveHeader.dwLoops = 1;

    result = waveOutPrepareHeader( m_WaveOut, &m_WaveHeader, sizeof(WAVEHDR) ); 
	if ( (result!= MMSYSERR_NOERROR) || ( m_WaveHeader.dwFlags != WHDR_PREPARED) )
	{
			AfxMessageBox(_T(" Sound Output Cannot Prepare Header !"));
			return result;
	}

	result = waveOutWrite( m_WaveOut, &m_WaveHeader, sizeof(WAVEHDR) );
	if  (result!= MMSYSERR_NOERROR) 
	{
			AfxMessageBox(_T(" Sound Output Cannot Write Buffer !"));
			return result;
	}

	// all is correct now we can start the process
	result = waveOutRestart( m_WaveOut );
	if  (result!= MMSYSERR_NOERROR) 
	{
			AfxMessageBox(_T(" Sound Output Cannot Start Wave Out !"));
			return result;
	}
	return result;
}



void CSoundOut::AddBuffer()
{
	
    MMRESULT result;

    result = waveOutUnprepareHeader( m_WaveOut, &m_WaveHeader, sizeof(WAVEHDR) ); 
   if  (result!= MMSYSERR_NOERROR) 
   {
        //AfxMessageBox(_T("Sound output Cannot UnPrepareHeader !"));
        return;
   };
 	m_SizeRecord = m_NbMaxSamples;
	m_WaveHeader.lpData = (CHAR *)OutputBuffer;
    m_WaveHeader.dwBufferLength = m_SizeRecord *2;
	m_WaveHeader.dwFlags = 0;
	m_WaveHeader.dwLoops = 0;
    result = waveOutPrepareHeader( m_WaveOut, &m_WaveHeader, sizeof(WAVEHDR) ); 
	if ( (result!= MMSYSERR_NOERROR) || ( m_WaveHeader.dwFlags != WHDR_PREPARED) )
			AfxMessageBox(_T("Sound output Cannot Prepare Header !"));

	result = waveOutWrite( m_WaveOut, &m_WaveHeader, sizeof(WAVEHDR) );
	if  (result!= MMSYSERR_NOERROR) 
			AfxMessageBox(_T("Sound output Cannot Add Buffer !"));

	result = waveOutRestart( m_WaveOut );
	if  (result!= MMSYSERR_NOERROR) 
			AfxMessageBox(_T(" Sound Output Cannot Start Wave Out !"));
}

/*
WAVE_FORMAT_1M08  11.025 kHz, mono, 8-bit 
WAVE_FORMAT_1M16  11.025 kHz, mono, 16-bit 
WAVE_FORMAT_1S08  11.025 kHz, stereo, 8-bit 
WAVE_FORMAT_1S16  11.025 kHz, stereo, 16-bit 
WAVE_FORMAT_2M08  22.05 kHz, mono, 8-bit 
WAVE_FORMAT_2M16  22.05 kHz, mono, 16-bit 
WAVE_FORMAT_2S08  22.05 kHz, stereo, 8-bit 
WAVE_FORMAT_2S16  22.05 kHz, stereo, 16-bit 
WAVE_FORMAT_4M08  44.1 kHz, mono, 8-bit 
WAVE_FORMAT_4M16  44.1 kHz, mono, 16-bit 
WAVE_FORMAT_4S08  44.1 kHz, stereo, 8-bit 
WAVE_FORMAT_4S16  44.1 kHz, stereo, 16-bit 
*/ 

void CSoundOut:: WaveInitFormat(    WORD    nCh, // number of channels (mono, stereo)
								DWORD   nSampleRate, // sample rate
								WORD    BitsPerSample)
{
		m_WaveFormat.wFormatTag = WAVE_FORMAT_PCM;
		m_WaveFormat.nChannels = nCh;
		m_WaveFormat.nSamplesPerSec = nSampleRate;
		m_WaveFormat.nAvgBytesPerSec = nSampleRate * nCh * BitsPerSample/8;
		m_WaveFormat.nBlockAlign = m_WaveFormat.nChannels * BitsPerSample/8;
		m_WaveFormat.wBitsPerSample = BitsPerSample;
		m_WaveFormat.cbSize = 0;
}   


///////////////////////////////////////////////////////////////////////////
// the comutation for the Output samples need to be calibrated according
// to the SoundOut board  add an Offset and a Mult coef.

void CSoundOut::ComputeSamples(LPSTR pt)
{
}  


void CSoundOut::CloseOutput()
{
	if (m_WaveOut) 
		waveOutPause(m_WaveOut);
    Sleep(50);  // wait for the pause

	m_TerminateThread = TRUE;
    if (m_WaveOutEvent )
		SetEvent(m_WaveOutEvent);
    Sleep(50);  // wait for the thread to terminate

	if (m_WaveOut) 
	{
		waveOutReset(m_WaveOut);
		waveOutClose(m_WaveOut);
	}
}

void CSoundOut::RazBuffers()
{
		for (int i=0;i<MAX_OUTPUT_SAMPLES;i++)
		{
	        OutputBuffer[i] = 0;
		}
}

void CSoundOut::StopOutput()
{
	waveOutPause(m_WaveOut);
}

void CSoundOut::StartOutput()
{
	waveOutRestart(m_WaveOut);
}

void CSoundOut::ResetOutput(void)
{
	waveOutReset(m_WaveOut);
}


/////////////////////////////////////////////////////////////////////////////////////////////////////////////
//    Glogal Thread procedure for the CSoundOut class
//    It cannot be included inside the Class
//   
// The LPARAM is the Class pointer it can be the base class CSoundOut
// or a drived class like CFft 
// The value of this parametre can change according because 
//  OpenMic() call a virtual funtion 
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
#define PT_S ((CSoundOut*)pParam) 

UINT WaveOutThreadProc(void * pParam)
{
   UINT result;
   UINT FirstPass = TRUE;


	if ( FirstPass)
		result = WaitForSingleObject(((CSoundOut*)pParam)->m_WaveOutEvent,INFINITE);
	FirstPass = FALSE;
    
	while (!((CSoundOut*)pParam)->m_TerminateThread)
	{
		result = WaitForSingleObject(((CSoundOut*)pParam)->m_WaveOutEvent,INFINITE);
		if ((result == WAIT_OBJECT_0)&&(!((CSoundOut*)pParam)->m_TerminateThread ))
		{
			PT_S->AddBuffer();      // Toggle as changed state here !Toggle point to the just received buffer
		    PT_S->ComputeSamples(PT_S->OutputBuffer);
		}
		else
			return 0;  // 
	}
    return 0;
}