在Linux下使用Openal来播放声音类

本文转载博客：http://www.linuxidc.com/Linux/2012-06/62639.htm

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头文件

/*
 * SoundPlay.h
 *  1:需要下载开发openal开发包(Software implementation of the OpenAL API(devlopment files))和alut开发包
 *  2：添加头文件路径：/usr/include/AL
 *  3:添加库：openal和alut
 */
#ifndef SOUNDPLAY_H_
#define SOUNDPLAY_H_

#include
#include
#include

#include
#include
#include

#define numBuffer 4   //可以同时播放4个声音
#define numSource 4   //可以同时播放4个声音

using namespace std;
class SoundPlay {
public:
    SoundPlay();
    virtual ~SoundPlay();
    void PlaySound(string fileName,int index,float volume);//当index=0：循环播放;index!=0:播放1次
    void SetVolume(int index,float volume);
    void ReleaseSound(int index);
    void MusicPause(int index);
    void MusicContinue(int index);
    bool CheckPlayState(int i);
private:
    void PlayLongSound(const char* fileName,int index);
    void OpenDevice();
    void CloseDevice();
    string GetALCErrorString(ALenum err);
private:
    ALuint buffers[numBuffer];
    ALuint sources[numSource];
    ALCcontext* cc;
    ALCdevice* dev;
    bool checkstate;
    ALenum result;
};
#endif /* SOUNDPLAY_H_ */

cpp文件

/*
 *  SoundPlay.cpp
 */
#include "SoundPlay.h"

SoundPlay::SoundPlay()
{
    alutInit(NULL,0);
    if ((result=alGetError()) != AL_NO_ERROR)
        cout<<"alutInit--"<
    OpenDevice();
    //PlaySound("Media/Music/BGSound1.wav",0,100);
}
SoundPlay::~SoundPlay()
{
    CloseDevice();
}
void SoundPlay::OpenDevice()
{
    ALCchar DeviceName[] = "ALSA Software";//ALSA Software,DirectSound3D
    dev=alcOpenDevice(DeviceName);
    cc=alcCreateContext(dev,NULL);
    alcMakeContextCurrent(cc);
}
void SoundPlay::CloseDevice()
{
    ALCcontext* context = alcGetCurrentContext();
    ALCdevice* device = alcGetContextsDevice( context );
    alcMakeContextCurrent( NULL );
    alcDestroyContext( context );
    alcCloseDevice( device );
}
void SoundPlay::ReleaseSound(int index)
{
    alDeleteSources(1,&sources[index]);
    alDeleteBuffers(1,&buffers[index]);
}
void SoundPlay::PlayLongSound(const char* fileName,int index)
{
    alGenSources(1,&sources[index]);
    alGenBuffers(1,&buffers[index]);
    ALvoid *data;
    ALsizei size=0,freq=0;
    ALenum format;
    ALboolean loop;
    alutLoadWAVFile((ALbyte *)fileName,&format,&data,&size,&freq,&loop);
    alBufferData(buffers[index],format,data,size,freq);
    if ((result=alGetError()) != AL_NO_ERROR)
        cout<<"PlayLongSound alBufferData errno"<
    alutUnloadWAV(format,data,size,freq);
    alSourcei(sources[index],AL_BUFFER,buffers[index]);//用音源关联缓冲器
    if(index==0)
        alSourcei(sources[index],AL_LOOPING,AL_TRUE);
    alSourcePlay(sources[index]);
}
void SoundPlay::PlaySound(string fileName,int index,float volume)
{
    alGenSources(1,&sources[index]);
    alGenBuffers(1,&buffers[index]);
    ReleaseSound(index);
    PlayLongSound(fileName.data(),index);
    alSourcef(sources[index],AL_GAIN,volume);
}
void SoundPlay::SetVolume(int index,float volume)//volume取值范围(0~1)
{
    alSourcef(sources[index],AL_GAIN,volume);
}
void SoundPlay::MusicPause(int index)
{
    alSourcePause(sources[index]);
    alSourceStop(sources[index]);
}
void SoundPlay::MusicContinue(int index)
{
    alSourcePlay(sources[index]);
}
bool SoundPlay::CheckPlayState(int i)
{
    ALint state;
    alGetSourcei(sources[i], AL_SOURCE_STATE, &state);
    if(state != AL_PLAYING)
    {
        checkstate=false;
        return true;
    }
    return false;
}
int main()
{
    SoundPlay sp;
    sp.PlaySound("Media/Music/BGSound1.wav",0,100);
    while(1){}
    return 0;
}