fix AudioCommon::Mixer Buffer indices This fix the 1h32 audio bug which outputs static sound after 1h32. The mixer is used for 32->48kHz resampling and as output buffer for the async audio backends. So this buffer was indiced by a writing and a reading pointer and the count of samples in it. As this is redundant and the sample count isn't accurate calculateable because of the interpolation, both indices gets out of sync. So after some time (~92min), this buffer overflows and return only garbage. thx @ moosehunter + delroth for debugging on this issue. You did the most work :-)