用waveOut进行声音播放的C++类

#include "zplaywavesound.h" void CALLBACK waveOutProc( HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 ) { if(uMsg == WOM_DONE) { LPWAVEHDR pwh = (LPWAVEHDR)dwParam1; // set as empty ((char *)(pwh->lpData))[ZPlayWaveSound::ZPLAYWAVESOUND_BUF_LEN] = 0; } return; } ZPlayWaveSound::ZPlayWaveSound() { m_hwo = NULL; m_iIndexOfBuf = 0; m_iIndexOfBlank = 0; } ZPlayWaveSound::~ZPlayWaveSound() { close(); } bool ZPlayWaveSound::init() { WAVEFORMATEX wfx; wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nChannels = 1; wfx.nSamplesPerSec = 8000; wfx.wBitsPerSample = 16; wfx.nBlockAlign = wfx.wBitsPerSample / 8 * wfx.nChannels; wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign; wfx.cbSize = 0; int iRetOpen = waveOutOpen(&m_hwo, WAVE_MAPPER, &wfx, (DWORD)waveOutProc, 0, CALLBACK_FUNCTION); if (iRetOpen != MMSYSERR_NOERROR) { return false; } for (int i = 0; i < ZPLAYWAVESOUND_BUF_NUM; i++) { memset(m_pcBuf[i], 0, ZPLAYWAVESOUND_BUF_LEN + 2); memset(&m_pwh[i], 0, sizeof(WAVEHDR)); m_pwh[i].lpData = m_pcBuf[i]; m_pwh[i].dwBufferLength = ZPLAYWAVESOUND_BUF_LEN; waveOutPrepareHeader(m_hwo, &m_pwh[i], sizeof(WAVEHDR)); } return true; } int ZPlayWaveSound::writeBuf(char *pcBuf, int iLen) { int iLenToWrite = iLen; while (iLenToWrite >= ZPLAYWAVESOUND_BUF_LEN - m_iIndexOfBlank) { // full if (m_pcBuf[m_iIndexOfBuf][ZPLAYWAVESOUND_BUF_LEN] != 0) { return (iLen - iLenToWrite); } WAVEHDR *pwhCurrent = &(m_pwh[m_iIndexOfBuf]); memcpy(m_pcBuf[m_iIndexOfBuf] + m_iIndexOfBlank, pcBuf + (iLen - iLenToWrite), ZPLAYWAVESOUND_BUF_LEN - m_iIndexOfBlank); pwhCurrent->lpData = m_pcBuf[m_iIndexOfBuf]; pwhCurrent->lpData[ZPLAYWAVESOUND_BUF_LEN] = 1; // set as full waveOutWrite(m_hwo, pwhCurrent, sizeof(WAVEHDR)); iLenToWrite -= (ZPLAYWAVESOUND_BUF_LEN - m_iIndexOfBlank); m_iIndexOfBlank = 0; m_iIndexOfBuf = (m_iIndexOfBuf + 1) % ZPLAYWAVESOUND_BUF_NUM; } if (iLenToWrite > 0) { // full if (m_pcBuf[m_iIndexOfBuf][ZPLAYWAVESOUND_BUF_LEN] != 0) { return (iLen - iLenToWrite); } memcpy(m_pcBuf[m_iIndexOfBuf] + m_iIndexOfBlank, pcBuf + (iLen - iLenToWrite), iLenToWrite); m_iIndexOfBlank = (m_iIndexOfBlank + iLenToWrite) % ZPLAYWAVESOUND_BUF_LEN; } return iLen; } void ZPlayWaveSound::close() { for (int i = 0; i < ZPLAYWAVESOUND_BUF_NUM; i++) { waveOutUnprepareHeader(m_hwo, &m_pwh[i], sizeof(WAVEHDR)); } waveOutClose(m_hwo); }