输入问题？请问我使用AVI函数获得了一个AVI文件的音频流以后，怎么将其转换为声音？？急急～～谢谢！

[一分之千]

如题，使用AVI函数获得了一个AVI文件的音频流以后，怎么将其转换为声音？？ avi函数只能获取了AVI文件的文件流，如果事视频流可以通过提取每一帧图像贴图重现，但是声音如何实现？多谢指点！

[一剑]

// Global variables.

HANDLE hData = NULL; // handle of waveform data memory
HPSTR lpData = NULL; // pointer to waveform data memory

void WriteWaveData(void)
{
HWAVEOUT hWaveOut;
HGLOBAL hWaveHdr;
LPWAVEHDR lpWaveHdr;
HMMIO hmmio;
UINT wResult;
HANDLE hFormat;
WAVEFORMAT *pFormat;
DWORD dwDataSize;

// Open a waveform device for output using window callback.

if (waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER,
(LPWAVEFORMAT)pFormat,
(LONG)hwndApp, 0L, CALLBACK_WINDOW))
{
MessageBox(hwndApp,
"Failed to open waveform output device.",
NULL, MB_OK | MB_ICONEXCLAMATION);
LocalUnlock(hFormat);
LocalFree(hFormat);
mmioClose(hmmio, 0);
return;
}

// Allocate and lock memory for the waveform data.

hData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, dwDataSize );
if (!hData)
{
MessageBox(hwndApp, "Out of memory.",
NULL, MB_OK | MB_ICONEXCLAMATION);
mmioClose(hmmio, 0);
return;
}
if ((lpData = GlobalLock(hData)) == NULL)
{
MessageBox(hwndApp, "Failed to lock memory for data chunk.",
NULL, MB_OK | MB_ICONEXCLAMATION);
GlobalFree(hData);
mmioClose(hmmio, 0);
return;
}

// Read the waveform data subchunk.

if(mmioRead(hmmio, (HPSTR) lpData, dwDataSize) != (LRESULT)dwDataSize)
{
MessageBox(hwndApp, "Failed to read data chunk.",
NULL, MB_OK | MB_ICONEXCLAMATION);
GlobalUnlock(hData);
GlobalFree(hData);
mmioClose(hmmio, 0);
return;
}

// Allocate and lock memory for the header.

hWaveHdr = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
(DWORD) sizeof(WAVEHDR));
if (hWaveHdr == NULL)
{
GlobalUnlock(hData);
GlobalFree(hData);
MessageBox(hwndApp, "Not enough memory for header.",
NULL, MB_OK | MB_ICONEXCLAMATION);
return;
}

lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr);
if (lpWaveHdr == NULL)
{
GlobalUnlock(hData);
GlobalFree(hData);
MessageBox(hwndApp,
"Failed to lock memory for header.",
NULL, MB_OK | MB_ICONEXCLAMATION);
return;
}

// After allocation, set up and prepare header.

lpWaveHdr->lpData = lpData;
lpWaveHdr->dwBufferLength = dwDataSize;
lpWaveHdr->dwFlags = 0L;
lpWaveHdr->dwLoops = 0L;
waveOutPrepareHeader(hWaveOut, lpWaveHdr, sizeof(WAVEHDR));

// Now the data block can be sent to the output device. The
// waveOutWrite function returns immediately and waveform
// data is sent to the output device in the background.

wResult = waveOutWrite(hWaveOut, lpWaveHdr, sizeof(WAVEHDR));
if (wResult != 0)
{
waveOutUnprepareHeader(hWaveOut, lpWaveHdr,
sizeof(WAVEHDR));
GlobalUnlock( hData);
GlobalFree(hData);
MessageBox(hwndApp, "Failed to write block to device",
NULL, MB_OK | MB_ICONEXCLAMATION);
return;
}
}

[一分之千]

loomman(一剑) 你的这个代码是不是针对wav格式的文件的读取的？我从AVI文件中提取出音频流以后是一个PAVISTREAM格式的变量，如何转化？

[一分之千]

怎么没人指教啊？大侠们帮我解决一下啊，着急用！