VC++播放音频文件和音频数据的方法

在程序中，很有可能会涉及到播放一些音频文件（比如：.wav文件）和音频数据，这个问题怎么解决呢？VC++中想要播放一个音频文件（.wav）是很容易的，只要调用WIndows API函数PlaySound()就可以了，但是，如果您想播放自己在程序中产生的一段音频数据，就不是那么简单了，需要利用WIndows wave I/O API的几个函数来实现。

下面结合实例来说明（完整实例可在我的CSDN资源中下载，该例子利用WIndows wave I/O API 函数，实现了播放自定义的一段音频数据（通过sin()函数产生）；并且使用了PlaySound()函数播放“250.wav”文件）：

 

//需包含的头文件
#include <MMSystem.h>
#pragma comment(lib,"winmm.lib")
//PlaySound()函数和其他WIndows wave I/O API 函数的使用
#include "math.h"//sin()函数的使用

//需包含的头文件 #include <MMSystem.h> #pragma comment(lib,"winmm.lib") //PlaySound()函数和其他WIndows wave I/O API 函数的使用 #include "math.h"//sin()函数的使用

1.播放文件：

CString path;
path.Format("%s250.wav",g_BasePath);
//g_BasePath的取值不用多说，前面已详细介绍了。
PlaySound(_T(path),0,SND_FILENAME|SND_ASYNC);

CString path; path.Format("%s250.wav",g_BasePath); //g_BasePath的取值不用多说，前面已详细介绍了。 PlaySound(_T(path),0,SND_FILENAME|SND_ASYNC);

2.播放数据：

（1）确定音频数据的格式及内容：

 

int rate=1000;  //刺激率
int sampleRate = 44100;  //采样率
constint NUMPTS = (int) (44100 * 0.5);   // 0.5s
shortint waveOut[NUMPTS];//音频数据

//内容
for (int i=0;i<NUMPTS;i++)
{
    waveOut[i] = (shortint)ceil(sin(2*3.1415926*rate*i/sampleRate)*20000);
}
//格式
WAVEFORMATEX pFormat;
pFormat.wFormatTag=WAVE_FORMAT_PCM;
//simple,uncompressed format
pFormat.nChannels=1;//1=mono, 2=stereo
pFormat.nSamplesPerSec=sampleRate; // 44100
pFormat.nAvgBytesPerSec=sampleRate*2;
// = nSamplesPerSec * n.Channels * wBitsPerSample/8
pFormat.nBlockAlign=2; // = n.Channels * wBitsPerSample/8
pFormat.wBitsPerSample=16;
//16 for high quality, 8 for telephone-grade
pFormat.cbSize=0;

int rate=1000; //刺激率 int sampleRate = 44100; //采样率 const int NUMPTS = (int) (44100 * 0.5); // 0.5s short int waveOut[NUMPTS];//音频数据 //内容 for (int i=0;i<NUMPTS;i++) { waveOut[i] = (short int)ceil(sin(2*3.1415926*rate*i/sampleRate)*20000); } //格式 WAVEFORMATEX pFormat; pFormat.wFormatTag=WAVE_FORMAT_PCM; //simple,uncompressed format pFormat.nChannels=1;//1=mono, 2=stereo pFormat.nSamplesPerSec=sampleRate; // 44100 pFormat.nAvgBytesPerSec=sampleRate*2; // = nSamplesPerSec * n.Channels * wBitsPerSample/8 pFormat.nBlockAlign=2; // = n.Channels * wBitsPerSample/8 pFormat.wBitsPerSample=16; //16 for high quality, 8 for telephone-grade pFormat.cbSize=0; （2）打开一个给定的波形音频输出装置：

 

HWAVEOUT     hWaveOut;
WAVEHDR      WaveOutHdr;
MMRESULT result;
result = waveOutOpen(&hWaveOut, WAVE_MAPPER,&pFormat,0L, 0L, WAVE_FORMAT_DIRECT);
if (result)
{
    MessageBox(_T("Failed to open waveform output device."));
    return;
}

HWAVEOUT hWaveOut; WAVEHDR WaveOutHdr; MMRESULT result; result = waveOutOpen(&hWaveOut, WAVE_MAPPER,&pFormat,0L, 0L, WAVE_FORMAT_DIRECT); if (result) { MessageBox(_T("Failed to open waveform output device.")); return; }（3）准备波形数据块：

 

WaveOutHdr.lpData = (LPSTR)waveOut;
WaveOutHdr.dwBufferLength = NUMPTS*2;
WaveOutHdr.dwBytesRecorded=0;
WaveOutHdr.dwUser = 0L;
WaveOutHdr.dwFlags = 0L;
WaveOutHdr.dwLoops = 0L;
waveOutPrepareHeader(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR));

WaveOutHdr.lpData = (LPSTR)waveOut; WaveOutHdr.dwBufferLength = NUMPTS*2; WaveOutHdr.dwBytesRecorded=0; WaveOutHdr.dwUser = 0L; WaveOutHdr.dwFlags = 0L; WaveOutHdr.dwLoops = 0L; waveOutPrepareHeader(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR)); （4）向给定音频媒体中输出波形数据块：

 

result = waveOutWrite(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR));
if (result)
{
    MessageBox(_T("Failed to play sound"));
    return;
}

result = waveOutWrite(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR)); if (result) { MessageBox(_T("Failed to play sound")); return; }（5）清除准备：

 

// Wait until finished sound play
do {} while (waveOutUnprepareHeader(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR))==WAVERR_STILLPLAYING);

// Wait until finished sound play do {} while (waveOutUnprepareHeader(hWaveOut, &WaveOutHdr, sizeof(WAVEHDR))==WAVERR_STILLPLAYING); （6）关闭给定音频媒体：

 

waveOutClose(hWaveOut);