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Old 05-21-2005, 07:05 AM   #1
hylke
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OpenAL?


Hello
I've got the following code to play FancyPants.wav:
Code:
	ALuint num = 1;
	soundinfo = new SoundInfo[num];
	alGenBuffers(num, &BufferIndices);
	alGenSources(num, &SourceIndices);
	int error;
	int index = 0;
	soundinfo[index].buffer = BufferIndices;
	soundinfo[index].source = SourceIndices;
	alutLoadWAVFile((ALbyte*)"FancyPants.wav", &soundinfo[index].format, &soundinfo[index].data, &soundinfo[index].size, &soundinfo[index].freq, &soundinfo[index].loop);
	alBufferData(soundinfo[index].buffer, soundinfo[index].format, soundinfo[index].data, soundinfo[index].size, soundinfo[index].freq);
	alutUnloadWAV(soundinfo[index].format, soundinfo[index].data, soundinfo[index].size, soundinfo[index].freq);
	alSourcei(soundinfo[index].source, AL_BUFFER, soundinfo[index].buffer);
	alSourcef(soundinfo[index].source, AL_PITCH, 1.0);
	alSourcef(soundinfo[index].source, AL_GAIN, 1.0);
	float sourcepos[3] = { 0.0, 0.0, 0.0 };
	float listenerpos[3] = { 0.0, 0.0, 0.0 };
	float velocitysource[3] = { 0.0, 0.0, 0.0 };
	float velocitylistener[3] = { 0.0, 0.0, 0.0 };
	float orientation[6] = { 0.0, 0.0, -1.0, 0.0, 1.0, 0.0};
	alSourcefv(soundinfo[index].source, AL_POSITION, sourcepos);
	alSourcefv(soundinfo[index].source, AL_VELOCITY, velocitysource);
	alSourcei(soundinfo[index].source, AL_LOOPING, false);
	alListenerfv(AL_POSITION, listenerpos);
	alListenerfv(AL_VELOCITY, velocitylistener);
	alListenerfv(AL_ORIENTATION, orientation);
	while(true)
		alSourcePlay(soundinfo[index].source);
But my problem is that it doesn't work.
Can anyone see what's wrong with the code?
Sorry for being sucha noob.
Greetz Hylke
 
Old 05-21-2005, 11:49 AM   #2
deiussum
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I'm still a newb when it comes to OpenAL, but here are a couple of things I noticed off the top of my head:
  • I don't see a call to alutInit anywhere. Maybe that is in another portion of code you didn't include, though.
  • I don't think you need to put the alSourcePlay into an infinite loop like that. You are just going to start playing it again and again and again...

Other than that, it looks pretty similar to some of the test code I did when first trying to get OpenAL to play, though it's arranged a bit differently.
 
Old 05-21-2005, 01:06 PM   #3
hylke
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Ok, thanx.
That did the trick.
Hylke
EDIT:
btw, which tutorial are you following?

Last edited by hylke; 05-21-2005 at 01:08 PM.
 
Old 05-21-2005, 03:37 PM   #4
deiussum
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I don't remember to be honest. I wrote my OpenAL code to play wav files awhile ago and haven't had to do much with it since. I think I just used the OpenAL docs, though.
 
Old 05-22-2005, 04:14 AM   #5
hylke
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Oh ok.
 
Old 07-25-2005, 12:42 AM   #6
krock923
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can anyone post some openAL code that would allow me to just play a sound. I couldn't even edit out the little switch in the tutorial that I found online. This is quite confusing. . .
 
Old 07-25-2005, 11:32 AM   #7
AngryLlama
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OpenAngryLlama?? no I know, just kidding.
 
Old 07-25-2005, 11:37 AM   #8
deiussum
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Here's some sample code I threw together as an example. I'm not at home right now so I can't test to make sure it actually works, but it compiles with:

g++ soundtest.cpp -o soundtest -lopenal

Code:
#include <string>
#include <vector>
#include <AL/al.h>
#include <AL/alut.h>

unsigned int LoadWav(const std::string &sFilename);
void PlayWav(unsigned int nWavID,
    const std::vector<float> &vecListenerPosition,
    const std::vector<float> &vecListenerVelocity,
    const std::vector<float> &vecListenerOrientation,
    const std::vector<float> &vecSoundPosition,
    const std::vector<float> &vecSoundVelocity);

int main(int argc, char** argv)
{
    unsigned int nWavID;
    std::vector<float> vecListenerPosition(3);
    std::vector<float> vecListenerVelocity(3);
    std::vector<float> vecListenerOrientation(3);
    std::vector<float> vecSoundPosition(3);
    std::vector<float> vecSoundVelocity(3);

    alutInit(&argc, argv);

    nWavID = LoadWav("somewavefile.wav");

    // Initialize vectors to 0, maybe not necessary, but safe
    for (int c=0;c<3;c++)
    {
        vecListenerPosition[c] = 0;
        vecListenerVelocity[c] = 0;
        vecListenerOrientation[c] = 0;
        vecSoundPosition[c] = 0;
        vecSoundVelocity[c] = 0;
    }

    // set orientation to face down z axis
    vecListenerOrientation[2] = 1;

    PlayWav(nWavID, vecListenerPosition, vecListenerVelocity,
            vecListenerOrientation, vecSoundPosition, vecSoundVelocity);

    return 0;
}

void PlayWav(unsigned int nWavID,
    const std::vector<float> &vecListenerPosition,
    const std::vector<float> &vecListenerVelocity,
    const std::vector<float> &vecListenerOrientation,
    const std::vector<float> &vecSoundPosition,
    const std::vector<float> &vecSoundVelocity)
{
    unsigned int nSource;

    alListenerfv(AL_POSITION, &vecListenerPosition[0]);
    alListenerfv(AL_VELOCITY, &vecListenerVelocity[0]);
    alListenerfv(AL_ORIENTATION, &vecListenerOrientation[0]);

    alGenSources(1, &nSource);
    alSourcef(nSource, AL_PITCH, 1.0f);
    alSourcef(nSource, AL_GAIN, 1.0f);
    alSourcefv(nSource, AL_POSITION, &vecSoundPosition[0]);
    alSourcefv(nSource, AL_VELOCITY, &vecSoundVelocity[0]);
    alSourcei(nSource, AL_BUFFER, nWavID);
    alSourcei(nSource, AL_LOOPING, AL_FALSE);

    alSourcePlay(nSource);
}

unsigned int LoadWav(const std::string &sFilename)
{
    unsigned int nID;
    ALenum eFormat;
    ALvoid *pData;
    ALboolean b;
    ALsizei nSize;
    ALsizei nFreq;

    alGenBuffers(1, &nID);

    alutLoadWAVFile(const_cast<ALbyte*>(reinterpret_cast<const ALbyte*>(
                    sFilename.c_str())), &eFormat, &pData, &nSize, &nFreq, &b);
    alBufferData(nID, eFormat, pData, nSize, nFreq);
    alutUnloadWAV(eFormat, pData, nSize, nFreq);

    return nID;
}
 
Old 07-25-2005, 06:31 PM   #9
krock923
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thank you very much, however that wouldn't compile for some reason.
Code:
sound.C: In function `void PlayWav(unsigned int, const std::vector<float,
   std::allocator<float> >&, const std::vector<float, std::allocator<float> >&,
   const std::vector<float, std::allocator<float> >&, const std::vector<float,
   std::allocator<float> >&, const std::vector<float, std::allocator<float>
   >&)':
sound.C:55: invalid conversion from `const float*' to `ALfloat*'
sound.C:56: invalid conversion from `const float*' to `ALfloat*'
sound.C:57: invalid conversion from `const float*' to `ALfloat*'
sound.C:62: invalid conversion from `const float*' to `ALfloat*'
sound.C:63: invalid conversion from `const float*' to `ALfloat*'
Maybe I just don't understand the API well enough. I could only find minimal documentation.

Last edited by krock923; 07-25-2005 at 06:33 PM.
 
Old 07-25-2005, 06:49 PM   #10
deiussum
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Interesting. I wonder if you have a different version of OpenAL than I do with the parameter of the fv version of functions not delcared const... You can try a few things.

1. Do a const_cast to get rid of the "constness" of the vector. Not usually the best thing to do, but in this case those functions SHOULDN'T be modifying the contents.

e.g.
alListenerfv(AL_POSITION, &vecListenerPosition[0]);
becomes:
alListenerfv(AL_POSITION, const_cast<ALfloat*>(&vecListenerPosition[0]));


2. Just do a C-style cast to ALfloat*
e.g.
alListenerfv(AL_POSITION, &vecListenerPosition[0]);
becomes:
alListenerfv(AL_POSITION, (ALfloat*)&vecListenerPosition[0]);

3. Switch to the 3f version
e.g.
alListenerfv(AL_POSITION, &vecListenerPosition[0]);
becomes:
alListener3f(AL_POSITION, vecListenerPosition[0], vecListenerPosition[1], vecListenerPosition[2]);

4. Just change my functions to take in ALfloat pointers and pass them directly to the function.
 
  


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