Question

I’m new using OpenAl library. I’m following the OpenAl programming guide but i can’t find.

I have this code extracted from page 10 of the OpenAl programming guide but still have no sound. I use OSX Snow Leopard, i know OSX doesn’t have ALUT defined.

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>

#include <OpenAL/al.h>
#include <OpenAL/alc.h>

using namespace std;

#define NUM_BUFFERS 3
#define BUFFER_SIZE 4096

int main(int argc, char **argv)
{
    ALCdevice *dev;
    ALCcontext *ctx;
    struct stat statbuf;

    Aluint buffer[NUM_BUFFERS];
    Aluint source[NUM_SOURCES];

    ALsizei size, freq;
    ALenum format;
    ALvoid *data;

    // Initialization 
    dev = alcOpenDevice(NULL); // select the "preferred dev" 

    if (dev) 
    { 
        ctx = alcCreateContext(dev,NULL); 
        alcMakeContextCurrent(ctx);  
    } 
    // Check for EAX 2.0 support 
    // g_bEAX = alIsExtensionPresent("EAX2.0");

    // Generate Buffers 
    alGetError(); // clear error code 
    alGenBuffers(NUM_BUFFERS, buffer); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
        DisplayALError("alGenBuffers :", error); 
        return 1; 
    } 
    // Load test.wav 
    loadWAVFile("sample.wav", &format, &data, &size, &freq, &loop); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
        DisplayALError("LoadWAVFile sample.wav : ", error); 
        alDeleteBuffers(NUM_BUFFERS, buffer); 
     return 1; 
    }

    // Copy test.wav data into AL Buffer 0 
    alBufferData(buffer[0], format, data, size, freq); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
     DisplayALError("alBufferData buffer 0 : ", error); 
     alDeleteBuffers(NUM_BUFFERS, buffer); 
     return 1; 
    } 

    // Unload test.wav 
    unloadWAV(format, data, size, freq); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
        DisplayALError("UnloadWAV : ", error); 
        alDeleteBuffers(NUM_BUFFERS, buffer); 
        return 1; 
    } 
    // Generate Sources 
    alGenSources(1, source); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
        DisplayALError("alGenSources 1 : ", error); 
        return 1; 
    } 
    // Attach buffer 0 to source
    alSourcei(source[0], AL_BUFFER, buffer[0]); 
    if ((error = alGetError()) != AL_NO_ERROR) 
    { 
        DisplayALError("alSourcei AL_BUFFER 0 : ", error); 
    } 

    // Exit 
    ctx = alcGetCurrentContext(); 
    dev = alcGetContextsDevice(ctx); 
    alcMakeContextCurrent(NULL); 
    alcDestroyContext(ctx); 
    alcCloseDevice(dev);

    return 0;
}

What things I missed to make this code work ???
What i’m doing wrong ???

Any advice could help, thanks.

Answer 1

You are not calling alSourcePlay(source[0]) to start the playback.