CSoundOut Class

//////////////////////////////////////////////////////////////////////// SoundOut.h: interface for the CSound class.////////////////////////////////////////////////////////////////////////////////////////// #pragma once#include <mmsystem.h>#define MAX_OUTPUT_SAMPLES 8192 #define MAX_VOIE 2#define MAX_SIZE_SAMPLES 1 // WORD#define MAX_SIZE_OUTPUT_BUFFER (MAX_OUTPUT_SAMPLES*MAX_VOIE*MAX_SIZE_SAMPLES) #define MAX_OUT_BUFFERS 2 class CSoundOut {protected: struct _WAVE_HW_STRUCT { WAVEHDRm_WaveHeader; SHORT OutputBuffer[MAX_SIZE_OUTPUT_BUFFER]; }m_HW_WaveData[MAX_OUT_BUFFERS]; WAVEOUTCAPSm_WaveOutDevCaps; HWAVEOUT m_WaveOut; WAVEFORMATEXm_WaveFormat; BOOL bTerminateFlage; UINT m_WaveOutSampleRate; //////////////////////////////////////////////////////// functions memberspublic :void StartOutput();void StopOutput();void CloseOutput();public :virtual void UpdateSamplesData(SHORT *); MMRESULT OpenOutput();void WaveInitFormat( WORD nCh, // number of channels (mono, stereo)DWORD nSampleRate, // sample rateWORD BitsPerSample);CSoundOut();virtual ~CSoundOut();public: static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);};

 

//////////////////////////////////////////////////////////////////////// SoundOut.cpp: implementation of the CSoundOut class.////////////////////////////////////////////////////////////////////////////////////////// #include "stdafx.h"#include "math.h"#include "SoundOut.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endif#pragma comment(lib, "winmm.lib ")//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CSoundOut::CSoundOut(){ // init format m_WaveOutSampleRate = 44100; WaveInitFormat(MAX_VOIE, m_WaveOutSampleRate /* khz */,16 /* bits */); memset(&m_HW_WaveData, 0, sizeof(m_HW_WaveData)); bTerminateFlage = FALSE; m_WaveOut = NULL;}CSoundOut::~CSoundOut(){ CloseOutput();}///////////////////////////////////////////////////////////////////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 !")); } // Open Output result = waveOutOpen( &m_WaveOut,0, &m_WaveFormat,(DWORD)waveOutProc , (DWORD)this, CALLBACK_FUNCTION ); if ( result!= MMSYSERR_NOERROR) { AfxMessageBox(_T("Sound output Cannot Open Device!")); return result; } for(int i=0; i<MAX_OUT_BUFFERS; i++) { _WAVE_HW_STRUCT *pWaveOut = &m_HW_WaveData[i]; UpdateSamplesData(pWaveOut->OutputBuffer); pWaveOut->m_WaveHeader.lpData = (CHAR *)&pWaveOut->OutputBuffer[0]; pWaveOut->m_WaveHeader.dwBufferLength = sizeof(pWaveOut->OutputBuffer); pWaveOut->m_WaveHeader.dwFlags = 0; result = waveOutPrepareHeader( m_WaveOut, &pWaveOut->m_WaveHeader, sizeof(WAVEHDR) ); //MMRESULT waveOutPrepareHeader( HWAVEOUT hwi, LPWAVEHDR pwh, UINT cbwh ); if ( (result!= MMSYSERR_NOERROR) || ( pWaveOut->m_WaveHeader.dwFlags != WHDR_PREPARED) ) { AfxMessageBox(_T(" Sound Output Cannot Prepare Header !")); return result; } result = waveOutWrite( m_WaveOut, &pWaveOut->m_WaveHeader, sizeof(WAVEHDR) ); if (result!= MMSYSERR_NOERROR) { AfxMessageBox(_T(" Sound Output Cannot Write Buffer !")); return result; } } bTerminateFlage = false; // 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;}//在这里以正弦波为例 实际应用中可以是PCM波形数据void CSoundOut::UpdateSamplesData(SHORT *pBuffer){ static double m_Angle[2] = {0, 0}; static double Freq[2] = {1000, 5000}; static double D_PI = 2.0 * (atan(1.0) * 4.0); //2π double dAnagle[2] = {D_PI * Freq[0]/m_WaveOutSampleRate, D_PI * Freq[1]/m_WaveOutSampleRate}; /* init the sound Ouutput buffer with a signal noise */ for (DWORD i = 0 ; i<MAX_OUTPUT_SAMPLES; i++) { *pBuffer++ = (SHORT)(32000.0*sin(m_Angle[0])); //ch1 m_Angle[0] += dAnagle[0]; if(MAX_VOIE > 1) { *pBuffer++ = (SHORT)(32000.0*sin(m_Angle[1])); //ch2 m_Angle[1] += dAnagle[1]; } }}/*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 rateWORD 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::CloseOutput(){ bTerminateFlage = TRUE; if (m_WaveOut) { waveOutReset(m_WaveOut); for(int i=0; i<MAX_OUT_BUFFERS; i++) { _WAVE_HW_STRUCT *pWaveOut = &m_HW_WaveData[i]; MMRESULT result = waveOutUnprepareHeader( m_WaveOut, &pWaveOut->m_WaveHeader, sizeof(WAVEHDR) ); if (result!= MMSYSERR_NOERROR) AfxMessageBox(_T("Sound output Cannot UnPrepareHeader !")); } waveOutClose(m_WaveOut); m_WaveOut = NULL; }}void CSoundOut::StopOutput(){waveOutPause(m_WaveOut);}void CSoundOut::StartOutput(){waveOutRestart(m_WaveOut);}void CSoundOut::waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2){ CSoundOut *pSoundOut = (CSoundOut *)dwInstance; if(pSoundOut->bTerminateFlage) return; switch(uMsg) { case(WOM_DONE): { WAVEHDR *pWaveHeader = (WAVEHDR*)dwParam1; pSoundOut->UpdateSamplesData((SHORT*)pWaveHeader->lpData); MMRESULT result = waveOutWrite( pSoundOut->m_WaveOut, pWaveHeader, sizeof(WAVEHDR) ); if (result!= MMSYSERR_NOERROR) AfxMessageBox(_T("Sound output Cannot Add Buffer !")); break; } case(WOM_OPEN): case(WOM_CLOSE): default: { break; } }}  

 

//测试用例//testDlg.hpublic:  CSoundOut m_SoundOut;

 

//TestDlg.CPP//BOOL CTestDlg::OnInitDialog(){  CDialog::OnInitDialog();  // Set the icon for this dialog.  The framework does this automatically  //  when the application's main window is not a dialog  SetIcon(m_hIcon, TRUE);// Set big icon  SetIcon(m_hIcon, FALSE);// Set small icon  // TODO: Add extra initialization here  VERIFY(m_SoundOut.OpenOutput() == MMSYSERR_NOERROR);  return TRUE;  // return TRUE  unless you set the focus to a control}