playfile.cpp

在windows mobile平台上

// Playfile.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <windows.h>
#include <commctrl.h>
#define MM_WOM_SETSECONDARYGAINCLASS   (WM_USER)
int _tmain(int argc, _TCHAR* argv[])
{
    DWORD dwWait;
    WAVEFORMATEX m_wfx;
    HWAVEOUT m_hWaveOutDevice;
    WAVEHDR *l_pCurrent;
    
    HANDLE hevDone = CreateEvent(NULL, FALSE, FALSE, NULL);
    HANDLE m_hHeap = GetProcessHeap();
    MMRESULT mmRetCode;
    
    //the data format of "poweroff.wav"
    ZeroMemory(&m_wfx,sizeof(m_wfx));
    m_wfx.cbSize = 0;
    m_wfx.wFormatTag = WAVE_FORMAT_PCM;
    m_wfx.wBitsPerSample = 8;// default to 8-bit samples
    m_wfx.nSamplesPerSec = 8000;
    m_wfx.nChannels = 1;
    m_wfx.nBlockAlign = (m_wfx.nChannels * m_wfx.wBitsPerSample) >> 3;
    m_wfx.nAvgBytesPerSec = m_wfx.nBlockAlign * m_wfx.nSamplesPerSec;
    
    //1.Open the file:
    HANDLE l_hFile = NULL;
    int l_iFileSize = 0;
    BYTE *l_pFileStart;
    DWORD l_dwReadBytes;
    l_hFile = CreateFile( L"test.wav",
        GENERIC_READ,
        FILE_SHARE_READ,
        NULL,
        OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL,
        0);    
    l_iFileSize = GetFileSize(l_hFile,NULL);
    l_pFileStart = (BYTE*) HeapAlloc( m_hHeap, 0 ,l_iFileSize );
    ReadFile(l_hFile,l_pFileStart,l_iFileSize,&l_dwReadBytes,NULL);
    
    //2.open the wave stream.
    mmRetCode = waveOutOpen(&m_hWaveOutDevice, 
        WAVE_MAPPER, 
        &m_wfx, 
        (DWORD)hevDone, 
        NULL, 
        CALLBACK_EVENT);

    //3.set the secondary gain class
    waveOutMessage(m_hWaveOutDevice,MM_WOM_SETSECONDARYGAINCLASS,2,0);

    //4. fill the buffer from the file.
    l_pCurrent  = (LPWAVEHDR) HeapAlloc(m_hHeap,HEAP_ZERO_MEMORY, sizeof(WAVEHDR) );
    l_pCurrent->lpData = (LPSTR)l_pFileStart;
    l_pCurrent->dwBufferLength = l_iFileSize;	
    //memcpy(l_pCurrent->lpData, l_pFileStart, l_iFileSize);
    
    //5. write the buffer to audio driver.
    MMRESULT l_res = waveOutPrepareHeader(m_hWaveOutDevice, l_pCurrent, sizeof(WAVEHDR));
    MMRESULT l_res1 = waveOutWrite(m_hWaveOutDevice, l_pCurrent, sizeof(WAVEHDR));
    
    //6. wait for end of the playing
    dwWait = WaitForSingleObject(hevDone, 5000);//5000: timeout value, just magic number.
    
    //7.close the wave stream.
    waveOutClose(m_hWaveOutDevice);
    CloseHandle(l_hFile);
	return 0;
}