调用API获取话筒声音

主要代码如下

设置wav文件格式的结构体

C/C++ code

WAVEFORMATEX m_stWaveFrom;m_stWaveFrom.wFormatTag     = WAVE_FORMAT_PCM;m_stWaveFrom.nChannels      = 1;m_stWaveFrom.nSamplesPerSec = 8000;m_stWaveFrom.nAvgBytesPerSec= 16000;m_stWaveFrom.nBlockAlign    = 2;m_stWaveFrom.wBitsPerSample = 16;m_stWaveFrom.cbSize         = 0;

打开话筒句柄

C/C++ code

HWAVEIN      m_hWaveIn;waveInOpen(&m_hWaveIn,WAVE_MAPPER,&m_stWaveFrom,(DWORD)this->m_hWnd,NULL,CALLBACK_WINDOW));

关联缓存

C/C++ code

WAVEHDR      m_stWaveHeadr1;WAVEHDR      m_stWaveHeadr2;BYTE*        m_pHandlBuffer1 = (PBYTE)malloc(16384);BYTE*        m_pHandlBuffer2 = (PBYTE)malloc(16384);m_stWaveHeadr1.lpData         = (LPSTR)m_pHandlBuffer1;m_stWaveHeadr1.dwBufferLength = 16384;m_stWaveHeadr2.lpData         = (LPSTR)m_pHandlBuffer2;m_stWaveHeadr2.dwBufferLength = 16384;waveInPrepareHeader(m_hWaveIn, &m_stWaveHeadr1, sizeof(m_stWaveHeadr1));waveInPrepareHeader(m_hWaveIn, &m_stWaveHeadr2, sizeof(m_stWaveHeadr2));waveInAddBuffer(m_hWaveIn, &m_stWaveHeadr1, sizeof(m_stWaveHeadr1));waveInAddBuffer(m_hWaveIn, &m_stWaveHeadr2, sizeof(m_stWaveHeadr2));

开始录音

C/C++ code

waveInSatrt(m_hWaveIn);

下面是响应MM_WIM_DATA消息
当开始录音时 m_bRcord = TRUE;
当停止录音时 m_bRcord = FALSE;

C/C++ code

PWAVEHDR fp = (PWAVEHDR) lParam;SaveVoice(fp);if(!m_bRcord){        waveInUnprepareHeader(m_hWaveIn, &m_stWaveHeadr1, sizeof(m_stWaveHeadr1));    memset(&m_stWaveHeadr1, 0, sizeof(m_stWaveHeadr1));    waveInUnprepareHeader(m_hWaveIn, &m_stWaveHeadr2, sizeof(m_stWaveHeadr2));    memset(&m_stWaveHeadr2, 0, sizeof(m_stWaveHeadr2));    waveInClose(m_hWaveIn);    m_hWaveIn = NULL;}else{    waveInAddBuffer(m_hWaveIn, fp, sizeof(*fp));}

下面是SaveVoice函数体
m_uFileBuLength是UINT类型的变量 用于存储 已经存放的字节数
m_pSaveFileBuffer 是PBYTE类型的变量，用于指向准备放入文件的内容
pVoice 是PWAVEHDR类型的变量，即上一段中的 fp

C/C++ code

if(NULL == m_pSaveFileBuffer){    m_uFileBuLength = pVoice->dwBytesRecorded;    m_pSaveFileBuffer = (PBYTE)malloc(m_uFileBuLength+1);    if(NULL == m_pSaveFileBuffer)    {        m_uFileBuLength = 0;        fputs("内存空间不足 in SaveVoice\n",m_pErrorFile);    }    else memcpy(m_pSaveFileBuffer, pVoice->lpData, pVoice->dwBytesRecorded);}else                //如果内存中有内容{    PBYTE pNewBuffer = (PBYTE)realloc(m_pSaveFileBuffer, m_uFileBuLength+pVoice->dwBytesRecorded);    //如果重新开辟空间失败 则输出到文件    if(NULL == pNewBuffer) WriteToFile(m_pSaveFileBuffer);    else    {        m_pSaveFileBuffer = pNewBuffer;        memcpy(m_pSaveFileBuffer+m_uFileBuLength, pVoice->lpData, pVoice->dwBytesRecorded);        m_uFileBuLength += pVoice->dwBytesRecorded;        //如果内存中数据大于 1M 则输出到文件 重置环境        if(m_uFileBuLength >= VOICE_MAX) WriteToFile(m_pSaveFileBuffer);        else if(!m_bRcord) WriteToFile(m_pSaveFileBuffer);    }}

以下是WriteToFile函数的实现

C/C++ code

UINT WaveHeaderSize = 36;UINT WaveFormatSize = 16;UINT ChunkSize = m_uFileBuLength + WaveHeaderSize;FILE * outFile = fopen("Voice.wav","wb");if(NULL == outFile){    fprintf(m_pErrorFile, "打开%s 失败\n","Voice.wav");    return;}fwrite("RIFF", 4, 1, outFile);fwrite(&ChunkSize, sizeof(ChunkSize), 1, outFile);fwrite("WAVE", 4, 1, outFile);fwrite("fmt ", 4, 1, outFile);fwrite(&WaveFormatSize, sizeof(WaveFormatSize), 1, outFile);    fwrite(&m_stWaveFrom.wFormatTag, sizeof(m_stWaveFrom.wFormatTag), 1, outFile);fwrite(&m_stWaveFrom.nChannels, sizeof(m_stWaveFrom.nChannels), 1, outFile);fwrite(&m_stWaveFrom.nSamplesPerSec, sizeof(m_stWaveFrom.nSamplesPerSec), 1, outFile);fwrite(&m_stWaveFrom.nAvgBytesPerSec, sizeof(m_stWaveFrom.nAvgBytesPerSec), 1, outFile);fwrite(&m_stWaveFrom.nBlockAlign, sizeof(m_stWaveFrom.nBlockAlign), 1, outFile);fwrite(&m_stWaveFrom.wBitsPerSample, sizeof(m_stWaveFrom.wBitsPerSample), 1, outFile);//fwrite(&m_stWaveFrom.cbSize,sizeof(m_stWaveFrom.cbSize),1,outFile);fwrite("data", 4, 1, outFile);fwrite(&m_uFileBuLength, sizeof(m_uFileBuLength), 1, outFile);    fwrite(m_pSaveFileBuffer,m_uFileBuLength, 1, outFile);fseek(outFile,m_uFileBuLength,SEEK_SET);fclose(outFile);free(m_pSaveFileBuffer);m_pSaveFileBuffer = NULL;m_uFileBuLength   = 0;