Windows下C++可用的OpenAL demo。
基于alut工具库的OpenAL例程，涵盖了基本的OpenAL指令，对部分作出了注释，并且可以播放（当然得把对应的音频文件放到正确的路径下）。
#include <iostream>
#include <al/alut.h>//alut includes al.h
#include <math.h>
#include <windows.h>
using namespace std; #define PI 3.14159265359 #define TEST_ERROR(_msg) \
error = alGetError(); \
if (error != AL_NO_ERROR) { \
fprintf(stderr, _msg "\n"); \
return -; \
} //ALboolean EnableSource2 = AL_TRUE; //是否播放第二组声音
ALboolean EnableSource2 = AL_FALSE; //是否播放第二组声音
ALboolean EnableSource3 = AL_FALSE; //是否播放第三组声音 ALuint buffer2,buffer3; void Init(){
alutInit(NULL, NULL);
} //OS音量40，windows7
void main()
{
ALuint source1[]; //buffer source //Init();//分离到一个单独的函数或类成员中
alutInit(NULL, NULL); //ALuint source1;
alGenSources(, &source1[]);
//短哔声：10217，Music：RevolvingDoorMONO，中国军魂
ALuint buffer1 = alutCreateBufferFromFile("RevolvingDoorMONO.WAV");//要实现空间化效果，必须为单声道文件（monaural）RevolvingDoorMONO if ((alGetError()) != AL_NO_ERROR)std::cout << "Buffer Create error!" << std::endl; alSourcei(source1[], AL_BUFFER, buffer1); if (EnableSource2){
alGenSources(, &source1[]);
buffer2 = alutCreateBufferFromFile("E:\\VS2013\\Projects2013\\OpenALtest\\OpenALtest\\10217.WAV");
alSourcei(source1[], AL_BUFFER, buffer2);
alSourcePlay(source1[]);
alSourcei(source1[], AL_LOOPING, AL_TRUE);//第二个音频是否循环
} if (EnableSource3){
alGenSources(, &source1[]);
ALuint temp = buffer1;
alSourcei(source1[], AL_BUFFER, temp);
alSourcePlay(source1[]);
alSourcei(source1[], AL_LOOPING, AL_TRUE);//第二个音频是否循环
} alSourcei(source1[], AL_SOURCE_RELATIVE, ); // set to relative positioning so we can set everything to 0
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_SOURCE_RELATIVE error" << std::endl;
/*AL_SOURCE_RELATIVE设为1时，没有衰减，也没有空间化。
*/ alSourcef(source1[], AL_ROLLOFF_FACTOR, 1.0); // 0 to disable attenuation 滚降衰减模型
/*AL_ROLLOFF_FACTOR设为1时，开启衰减，设为0时，没有衰减
*/ if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_ROLLOFF_FACTOR error" << std::endl;
alSourcef(source1[], AL_REFERENCE_DISTANCE, ); // doesn't matter alSourcef(source1[], AL_MAX_DISTANCE, .f);//超过AL_MAX_DISTANCE个单位后，将声音gain值限制在AL_MIN_GAIN（如果在cone之外，好像是再乘以AL_MIN_GAIN）
alSourcef(source1[], AL_MIN_GAIN, 0.0f);//设置AL_MIN_GAIN
alSourcef(source1[], AL_MAX_GAIN, .f);//设置AL_MAX_GAIN，即使设得比1大，也会自动回成1,并报输出ERROR alDistanceModel(AL_INVERSE_DISTANCE);//距离模型
//alDistanceModel(AL_NONE);//距离模型
//gain = AL_REFERENCE_DISTANCE / (AL_REFERENCE_DISTANCE + AL_ROLLOFF_FACTOR * (distance – AL_REFERENCE_DISTANCE)); alSourcef(source1[], AL_PITCH, .f);//调节音高乘数
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_PITCH error" << std::endl;
alSourcef(source1[], AL_GAIN, .f);//调节音量,但是受AL_MIN_GAIN影响，即使设得比min低，实际gain也会保持min设的值
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_GAIN error" << std::endl; //set source direction
alSource3f(source1[], AL_DIRECTION, .f, .f, .f);//朝z轴正方向
//set source position
alSource3f(source1[], AL_POSITION, .f, .f, .f);//初始位置为原点
//set source velocity
alSource3f(source1[], AL_VELOCITY, .f, .f, .f);//多普勒效应影响频率 alSourcef(source1[], AL_CONE_OUTER_GAIN, 0.0f);//the gain when outside the oriented cone
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_CONE_OUTER_GAIN error" << std::endl;
alSourcef(source1[], AL_CONE_INNER_ANGLE, .f);//内角 *PI / 180.f
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_CONE_INNER_ANGLE error" << std::endl;
alSourcef(source1[], AL_CONE_OUTER_ANGLE, .f);
if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_CONE_OUTER_ANGLE error" << std::endl; //set current listener position
alListener3f(AL_POSITION, -.f,.f,.f);
//-1.f,0.f,1.f 监听者在左，右耳音量较大
//1.f,0.f,1.f 监听者在右，左耳音量较大
//0.f,0.f,-1.f 监听者在后，在外角之外，声音为原来的AL_CONE_OUTER_GAIN倍,好像还要乘以AL_MIN_GAIN系数 //set current listener orientation
ALfloat orivec[] = { 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f };
alListenerfv(AL_ORIENTATION, orivec);
//设置好listener位置
////////////////////////////////////////////////////////////////////////// //tell the sound to loop continuously
alSourcei(source1[], AL_LOOPING, AL_TRUE); //play the sound
alSourcePlay(source1[]);//have its state changed to AL_PLAYING，重新播放 ALfloat gain,outer_gain,min_gain,max_gain,max_distance;
alGetSourcef(source1[], AL_GAIN, &gain); std::cout << "AL_GAIN: " << gain << std::endl;
alGetSourcef(source1[], AL_CONE_OUTER_GAIN, &outer_gain); std::cout << "AL_CONE_OUTER_GAIN: " << outer_gain << std::endl;
alGetSourcef(source1[], AL_MIN_GAIN, &min_gain); std::cout << "AL_MIN_GAIN: " << min_gain << std::endl;
alGetSourcef(source1[], AL_MAX_GAIN, &max_gain); std::cout << "AL_MAX_GAIN: " << max_gain << std::endl;
alGetSourcef(source1[], AL_MAX_DISTANCE, &max_distance); std::cout << "AL_MAX_DISTANCE: " << max_distance << std::endl;
std::cout << std::endl << "在音锥外角和最远衰减距离之外 gain * outer_gain * min_gain: " << gain*outer_gain*min_gain << std::endl;
std::cout << std::endl; ALint sourceID;
alGetSourcei(source1[], AL_SOURCE_TYPE, &sourceID);
std::cout << "AL_SOURCE_TYPE的ID： "<<sourceID << endl<<endl; ALint state;
ALfloat tick = ;
ALfloat moveStart_posx = -.f, moveStart_posy = .f, moveStart_posz = .f;
do{
std::cout << "playing......" << "\b\b\b\b\b\b\b\b\b\b\b\b\b"; ////旋转音锥
//float updatex = -sinf(play_it*PI / 180.f);
//float upadtez = cosf(play_it*PI / 180.f);
//alSource3f(source1, AL_DIRECTION, updatex, 0.f, upadtez);
//if ((alGetError()) != AL_NO_ERROR)std::cout << "AL_POSITION error" << std::endl;
//play_it=play_it+0.1f; ////平移声源
//alSource3f(source1, AL_POSITION, moveStart_posx, moveStart_posy, moveStart_posz);
//moveStart_posx = moveStart_posx + 0.00000011f; moveStart_posz = moveStart_posz + 0.00000015f; alGetSourcei(source1[], AL_SOURCE_STATE, &state); //是否播第二个音频资源
if (EnableSource2)
alGetSourcei(source1[], AL_SOURCE_STATE, &state); if (EnableSource3)
alGetSourcei(source1[], AL_SOURCE_STATE, &state); } while (state == AL_PLAYING || state==AL_PAUSED);//结束时state自动变成AL_STOPPED,source1、2共享一个state // To stop the sound
alSourceStop(source1[]);
//delete our source
alDeleteSources(, &source1[]);
////delete our buffer
alDeleteBuffers(, &buffer1);
if ((alGetError()) != AL_NO_ERROR)std::cout << "delete buffer1 error " << std::endl; if (EnableSource2){
alSourceStop(source1[]);
alDeleteBuffers(, &buffer2);
if ((alGetError()) != AL_NO_ERROR)std::cout << "delete buffer2 error" << std::endl;
alDeleteSources(, &source1[]);
if ((alGetError()) != AL_NO_ERROR)std::cout << "delete source error" << std::endl;
}
}