Clears the output stream buffer.
This function can be called from any thread.
This function can be called regardless of whether the outstream is paused
or not.
Some backends do not support clearing the buffer. On these backends this
function will return SoundIoErrorIncompatibleBackend.
Some devices do not support clearing the buffer. On these devices this
function might return SoundIoErrorIncompatibleDevice.
Possible errors:
Clears the output stream buffer. This function can be called from any thread. This function can be called regardless of whether the outstream is paused or not. Some backends do not support clearing the buffer. On these backends this function will return SoundIoErrorIncompatibleBackend. Some devices do not support clearing the buffer. On these devices this function might return SoundIoErrorIncompatibleDevice. Possible errors:
* #SoundIoErrorStreaming * #SoundIoErrorIncompatibleBackend * #SoundIoErrorIncompatibleDevice