采用动态链接库DLL编写的音频通信程序

#include "stdafx.h" #include "WaveIn.h" #include "math.h" #pragma comment(lib,"Winmm") DWORD CWaveIn::s_dwInstance = 0;//初始化用户实例数据 //线程处理 DWORD WINAPI CWaveIn::AudioInThreadProc(LPVOID lpParameter) { CWaveIn *pWaveIn; pWaveIn = (CWaveIn *)lpParameter; //缓存 char buffer[1024]; //消息处理主循环 MSG msg; while(GetMessage(&msg,0,0,0)) { switch(msg.message ) { //打开录音设备 case MM_WIM_OPEN: break; //关闭录音设备 case MM_WIM_CLOSE: break; //录音设备返回数据 case MM_WIM_DATA: //录音格式 WAVEHDR* pWH=(WAVEHDR*)msg.lParam; //释放缓存 waveInUnprepareHeader((HWAVEIN)msg.wParam,pWH,sizeof(WAVEHDR)); //非法数据 if(pWH->dwBytesRecorded!=SIZE_AUDIO_FRAME) break; //复制录音数据 memcpy(buffer,pWH->lpData,pWH->dwBytesRecorded); //设置时戳 pWaveIn->GetData (buffer ,pWH->dwBytesRecorded ); //为音频设备增加一个缓存,准备继续录音 waveInPrepareHeader((HWAVEIN)msg.wParam,pWH,sizeof(WAVEHDR)); waveInAddBuffer((HWAVEIN)msg.wParam,pWH,sizeof(WAVEHDR)); break; } } //返回 return msg.wParam; } //构造函数 CWaveIn::CWaveIn() : m_wChannel(1), m_dwSample (WISA_POOR), m_wBit(16) { m_hIn=0; m_bThreadStart = FALSE; m_bDevOpen = FALSE; m_bAllocBuffer = FALSE; m_bRecord = FALSE; m_pHdr = NULL; m_dwAudioInId = 0; s_dwInstance ++; } //构析函数 CWaveIn::~CWaveIn() { } //关闭录音设备 BOOL CWaveIn::CloseDev() { //设备已经关闭 if (!m_bDevOpen) { //返回 return FALSE; } //设备句柄无效 if(!m_hIn) { //返回 return FALSE; } //关闭录音设备 m_mmr=waveInClose(m_hIn); //出错 if(m_mmr) { //设置设备句柄无效 m_hIn=0; //设置设备启动标记 m_bDevOpen = FALSE; //返回 return FALSE; } //设置设备句柄无效 m_hIn=0; //设置设备启动标记 m_bDevOpen = FALSE; //返回 return TRUE; } //打开录音设备 BOOL CWaveIn::OpenDev() { //已经打开录音设备 if (m_bDevOpen) { //返回 return FALSE; } //设置录音设备输出格式 WAVEFORMATEX wfx; wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nChannels = m_wChannel; wfx.nSamplesPerSec = m_dwSample; wfx.nAvgBytesPerSec = m_wChannel * m_dwSample * m_wBit / 8; wfx.nBlockAlign = m_wBit * m_wChannel / 8; wfx.wBitsPerSample = m_wBit; wfx.cbSize = 0; //检查录音设备是否支持设定的输出格式 m_mmr=waveInOpen(0,WAVE_MAPPER,&wfx,0,0,WAVE_FORMAT_QUERY); //出错 if(m_mmr) { //返回 return FALSE; } //打开录音设备 m_mmr=waveInOpen(&m_hIn,WAVE_MAPPER,&wfx,m_dwAudioInId, s_dwInstance,CALLBACK_THREAD); //出错 if(m_mmr) { //返回 return FALSE; } //设置设备打开标记 m_bDevOpen = TRUE; //返回 return TRUE; } //启动线程 BOOL CWaveIn::StartThread() { //线程已经启动 if (m_bThreadStart) { //返回 return FALSE; } //创建线程 m_hAudioIn=CreateThread(0,0,AudioInThreadProc, this,0,&m_dwAudioInId); //出错 if(!m_hAudioIn) { //返回 return FALSE; } //设置线程启动标记 m_bThreadStart = TRUE; //返回 return TRUE; } //关闭线程 BOOL CWaveIn::StopThread() { //线程已经停止 if (!m_bThreadStart) { //返回 return FALSE; } //线程句柄有效 if(m_hAudioIn) { //循环变量 int t=50; //线程结束状态信息 DWORD ExitCode; //线程结束标记 BOOL bEnd=FALSE; //发送WM_QUIT消息 PostThreadMessage(m_dwAudioInId,WM_QUIT,0,0); //主循环 while(t) { //获取线程结束状态信息 GetExitCodeThread(m_hAudioIn,&ExitCode); //尚未结束 if(ExitCode!= STILL_ACTIVE) { //设置线程结束 bEnd=TRUE; break; } //休眠10毫秒 else { Sleep(10); } //修改循环变量 t--; } //线程尚未结束 if(!bEnd) { //终止线程 TerminateThread(m_hAudioIn,0); } //录音设备句柄无效 m_hAudioIn=0; } //设置线程结束标记 m_bThreadStart = FALSE; //返回 return TRUE; } //启动录音 BOOL CWaveIn::StartRec() { //返回值 BOOL bRet=FALSE; //启动线程失败 if (!StartThread()) { goto Exit; }; //打开录音设备失败 if (!OpenDev()) { goto Exit1; }; //准备缓存失败 if (!PerPareBuffer()) { goto Exit2; } //开始录音 if (!OpenRecord()) { goto Exit3; } //设置返回值 bRet = TRUE; goto Exit; Exit3: //释放缓存 FreeBuffer(); Exit2: //关闭录音设备 CloseDev (); Exit1: //停止线程 StopThread (); Exit: //返回 return bRet; } //终止录音 BOOL CWaveIn::StopRec() { //停止录音 CloseRecord (); //休眠1500毫秒 Sleep(1500); //释放缓存 FreeBuffer(); //关闭录音设备 if (CloseDev()) { //停止线程 StopThread (); } //返回 return TRUE; } //分配内存 BOOL CWaveIn::PerPareBuffer() { //已经分配内存 if (m_bAllocBuffer) { //返回 return FALSE; } //重置录音设备 m_mmr=waveInReset(m_hIn); //出错 if(m_mmr) { //返回 return FALSE; } //循环变量 UINT i; //新建WAVEHDR结构 m_pHdr=new WAVEHDR[NUM_BUF]; for(i=0;i<NUM_BUF;i++) { //初始化 ZeroMemory(&m_pHdr[i],sizeof(WAVEHDR)); //波形缓存 m_pHdr[i].lpData=new char[SIZE_AUDIO_FRAME]; //缓存大小 m_pHdr[i].dwBufferLength= SIZE_AUDIO_FRAME; //准备缓存 m_mmr=waveInPrepareHeader(m_hIn,&m_pHdr[i],sizeof(WAVEHDR)); //出错 if(m_mmr) { //返回 return FALSE; } //添加缓存到录音设备 m_mmr=waveInAddBuffer(m_hIn,&m_pHdr[i],sizeof(WAVEHDR)); //出错 if(m_mmr) { //返回 return FALSE; } } //设置内存分配标记 m_bAllocBuffer = TRUE; //返回 return TRUE; } //释放缓存 BOOL CWaveIn::FreeBuffer() { //内存分配标记为假 if (!m_bAllocBuffer) { //返回 return FALSE; } //循环标记 UINT i; //内存已经释放 if(!m_pHdr) { //返回 return FALSE; } for(i=0;i<NUM_BUF;i++) { //注销录音设备 m_mmr = waveInUnprepareHeader(m_hIn,&m_pHdr[i],sizeof(WAVEHDR)); //出错 if(m_mmr) { //休眠100毫秒 Sleep(100); //跳过 continue; } //释放数据内存单元 if(m_pHdr[i].lpData) { delete []m_pHdr[i].lpData; } } //释放WAVEHDR结构 delete []m_pHdr; m_pHdr = NULL; //设置内存分配标记 m_bAllocBuffer = FALSE; //返回 return TRUE; } //开始录音 BOOL CWaveIn::OpenRecord() { //已经开始录音 if (m_bRecord) { //返回 return FALSE; } //录音设备句柄无效 if(!m_hIn) { //返回 return FALSE; } //开始录音 m_mmr=waveInStart(m_hIn); //出错 if(m_mmr) { //返回 return FALSE; } //设置录音开始标记 m_bRecord = TRUE; //返回 return TRUE; } //停止录音 BOOL CWaveIn::CloseRecord() { //已经停止录音 if (!m_bRecord) { //返回 return FALSE; } //录音设备句柄无效 if(!m_hIn) { //返回 return FALSE; } //重置录音设备，停止录音 m_mmr=waveInReset(m_hIn); //出错 if(m_mmr) { //返回 return FALSE; } //设置录音停止标记 m_bRecord = FALSE; //返回 return TRUE; } void CWaveIn::GetData(char *pBuffer,int iLen) { static int i = 0; static SYSTEMTIME time,time1; static long l = 0; if (i == 0) { ::GetLocalTime (&time); } ::GetLocalTime (&time1); int j = time1.wSecond - time.wSecond; if (abs(j) >= 1 ) { memcpy(&time,&time1,sizeof(time)); TRACE("Len / second %d \n",l); l = 0; } l = l + iLen; i++; } MMRESULT CWaveIn::GetLastMMError() { return m_mmr; } CString CWaveIn::GetLastErrorString() { char buffer[256]; memset(buffer,0,256); waveInGetErrorText(m_mmr,buffer,256); return buffer; } void CWaveIn::SetChannel(WORD wChannel) { m_wChannel = (m_wChannel == wChannel) ? 2:1; } void CWaveIn::SetSample(DWORD dwSample) { m_dwSample = dwSample; } void CWaveIn::SetBit(WORD wBit) { m_wBit = (wBit == 8) ? 8:16; } DWORD CWaveIn::GetInstance() { return s_dwInstance; } WORD CWaveIn::GetBit() { return m_wBit; } DWORD CWaveIn::GetSample() { return m_dwSample; } WORD CWaveIn::GetChan