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Created attachment 4473 [details]
Patch that fixes the popping sounds caused by signed/unsigned conversion

Currently when SDL needs to convert audio for playback from an signed to an unsigned value (or vice versa) it outputs an either very high or very low silence value, leading to a popping sound and distortion in the audio playback of other applications (due to clipping) whenever a device requiring such a conversion plays back silence (because of being paused or having an empty audio queue). This happens because the silence value written into the stream (for later conversion to the audio devices format) isn't chosen based on the spec of that stream but based on the spec of the audio device. This leads to a wrong, extreme silence value which causes the described behavior.

This patch addresses that issue by taking the silence value that's put into the stream from the stream's spec.

This patch might be related to this bug: https://bugzilla.libsdl.org/show_bug.cgi?id=4805