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Re: Buffer size problem

by Jimmy Gervais :: Rate this Message:

The call needs a ALvoid pointer, it is specified and otherwise returns an error, hence to copy. But you are right about its location, it is not initialized and then used to create an array, overwritting the memory hazardously. So I did this instead:

    ALvoid * PTampon1; // My Buffer void pointer
    short * Tampon1; // My Buffer short pointer
    Tampon1 = new short [B_SIZE]; // Initializing the short pointer with a new array
    PTampon1 = (ALvoid*)Tampon1; // Copy the short pointer into a void one

Now it doesn't crash, not even with 500MB, but I got no sound at all!! loll
I put the warning option on as you suggested, but got none either ways.
Thanks for your help, I might be half way through now.

2009/7/3 Chris Robinson <chris.kcat@...>

On Friday 03 July 2009 11:40:51 am Jimmy Gervais wrote:
> ALvoid * PTampon1; // My Buffer
> short * Tampon1;
> Tampon1 = (short*)PTampon1;
> Tampon1 = new short [taille];

...

> std::cout << "Buffers ... " << std::endl;
> alBufferData(MesTampons[0], AL_FORMAT_STEREO16, PTampon1, taille,
> 44100); // Hangs here when size > ~ 250'000

This doesn't look right. PTampon1 is left uninitialized, Tampon1 is set to the
uninitialized value, then overwritten with a new buffer. PTampon1, still
uninitialized, is passed to alBufferData. That it sometimes works is just a
coincidence: if PTampon1 happens to be NULL, alBufferData will cause an error
and return without crashing (though attaching it to a source an d trying to
play the source will fail, too). If it's a non-NULL value, it will likely
crash.

Something like this should work:

short * Tampon1; // My Buffer
Tampon1 = new short [taille];
...

std::cout << "Buffers ... " << std::endl;

alBufferData(MesTampons[0], AL_FORMAT_STEREO16, Tampon1, taille, 44100);

You don't need the extra PTampon1 pointer. It may also help to turn on
compiler warnings (-Wall -Wextra in GCC), as that would have warned you about
the uninitialized pointer.

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