[問題] 播放wav檔的問題
最近在播放wav檔時有了一些問題，
播出來的聲音只有"逼"一聲，跟檔案的聲音不一樣。
先讀出前面檔頭後，得到:
Channel: 1 //值存在 m_wChannels;
Sample rate: 11025 //值存在 m_dwSampleRate;
Bit rate: 8 //值存在 m_wBitRate;
Block Align: 1 //值存在 m_wBlockAlign;
Size of Data: 7057 //值存在 m_dwBufferSize;
用BYTE pointer讀取檔頭後面的data sample：
BYTE* m_pRawDataBuf = new BYTE [m_dwBufferSize];
DWORD cbRead = 0;
BOOL bOK = ReadFile(m_hFile, m_pRawDataBuf, sizeof(m_dwBufferSize),
&cbRead, NULL);
Q1. 請問用BYTE儲存後面的sample value對嗎？還是要用char？
Q2. Sample value的range是 0~255 還是 -127~128？
然後用waveOutXXX系列的函數輸出聲音，依序調用waveOutOpen, waveOutPrepareHeader,
waveOutWrite, waveOutUnprepareHeader
HWAVEOUT m_hWaveOut = NULL;
WAVEFORMATEX wavFormat = {0};
memcpy_s(&wavFormat, sizeof(WAVEFORMATEX), &m_pcmHeader, sizeof(PCMWAVEFORMAT));
UINT uResult = 0;
uResult = waveOutOpen(&m_hWaveOut, WAVE_MAPPER, (LPWAVEFORMATEX)&wavFormat,
NULL, 0, CALLBACK_NULL);
if(uResult != MMSYSERR_NOERROR)
return
WAVEHDR wavHeader = {0};
wavHeader.dwBufferLength = m_dwBufferSize;
wavHeader.lpData = (char*)m_pRawDataBuf;
uResult = waveOutPrepareHeader(m_hWaveOut, &wavHeader, sizeof(WAVEHDR));
if(uResult != MMSYSERR_NOERROR)
return;
uResult = waveOutWrite(m_hWaveOut, &wavHeader, sizeof(WAVEHDR));
if(uResult != MMSYSERR_NOERROR)
return;
Sleep(3000);
while(waveOutUnprepareHeader(m_hWaveOut, &wavHeader, sizeof(WAVEHDR)) ==
WAVERR_STILLPLAYING)
Sleep(100);
每個API調用結果uResult都是0，表示正確，但最後輸出的聲音卻只有"逼"一聲
Q3. 請問是哪裡有出錯嗎？
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