[問題] 播放wav檔的問題

[rosemary0401 (靠，為什麼沒考上榜首)]

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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