使用DirectSound读取与播放WAV文件的代码示例

//-----------------------------------------------------------------------------   
// File: WavRead.cpp   
//   
// Desc: Wave file support for loading and playing Wave files using DirectSound    
//       buffers.   
//   
// Copyright (c) 1999 Microsoft Corp. All rights reserved.   
//-----------------------------------------------------------------------------   
#include <windows.h>   
#include "WavRead.h"   
   
   
   
   
//-----------------------------------------------------------------------------   
// Defines, constants, and global variables   
//-----------------------------------------------------------------------------   
#define SAFE_DELETE(p)  { if(p) { delete (p);     (p)=NULL; } }   
#define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } }   
   
   
   
   
//-----------------------------------------------------------------------------   
// Name: ReadMMIO()   
// Desc: Support function for reading from a multimedia I/O stream   
//-----------------------------------------------------------------------------   
HRESULT ReadMMIO( HMMIO hmmioIn, MMCKINFO* pckInRIFF, WAVEFORMATEX** ppwfxInfo )   
{   
    MMCKINFO        ckIn;           // chunk info. for general use.   

    PCMWAVEFORMAT   pcmWaveFormat;  // Temp PCM structure to load in.          
   
    *ppwfxInfo = NULL;   
   
    if( ( 0 != mmioDescend( hmmioIn, pckInRIFF, NULL, 0 ) ) )   
        return E_FAIL;   
   
    if( (pckInRIFF->ckid != FOURCC_RIFF) ||   
        (pckInRIFF->fccType != mmioFOURCC('W', 'A', 'V', 'E') ) )   
        return E_FAIL;   
   
    // Search the input file for for the 'fmt ' chunk.   
    ckIn.ckid = mmioFOURCC('f', 'm', 't', ' ');   
    if( 0 != mmioDescend(hmmioIn, &ckIn, pckInRIFF, MMIO_FINDCHUNK) )   
        return E_FAIL;   
   
    // Expect the 'fmt' chunk to be at least as large as <pcmwaveformat>;   
    // if there are extra parameters at the end, we'll ignore them   
       if( ckIn.cksize < (LONG) sizeof(PCMWAVEFORMAT) )   
           return E_FAIL;   
   
    // Read the 'fmt ' chunk into <pcmwaveformat>.   
    if( mmioRead( hmmioIn, (HPSTR) &pcmWaveFormat,    
                  sizeof(pcmWaveFormat)) != sizeof(pcmWaveFormat) )   
        return E_FAIL;   
   
    // Allocate the waveformatex, but if its not pcm format, read the next   
    // word, and thats how many extra bytes to allocate.   
    if( pcmWaveFormat.wf.wFormatTag == WAVE_FORMAT_PCM )   
    {