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Date: Mon, 07 Mar 2005 23:41:22 +0100
From: Andreas Hartmetz <ahartmetz@web.de>
Subject: [SDL] "unexpected behaviour" in Mix_OpenAudio

Hi  list!

I am having problems with doom-legacy for SDL. The music plays nicely
but the sfx are playing much too fast/high-pitched: sampling rate
mismatch...
When I looked into the source to find the cause of it, I found something
that *might* introduce the error but at  least hides bugs in SDL-using
programs/games:

in Mix_OpenAudio:
-----------------------------
/* Open the mixer with a certain desired audio format */
int Mix_OpenAudio(int frequency, Uint16 format, int nchannels, int
chunksize)
{
        int i;
        SDL_AudioSpec desired;

        /* If the mixer is already opened, increment open count */
        if ( audio_opened ) {
            ++audio_opened;
            return(0);
        }
(....)
------------------------------
if a Mixer has already been opened with paramter set A and I try to open
another one with parameter set B, Mix_OpenAudio will happily say "you 
already opened audio with parameter set B, go ahead",  which is wrong.

Regards, Andreas