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MythPlayer: Fix a Live TV channel change deadlock.
This recognises that the decoder loop effectively has 3 different states - running, partially paused and completely paused. The partial pause state still allows the playback thread to decode a single frame on demand, seek and perform position map syncs. Allowing these while the decoder is changing adds various complications - hence add a new member state variable, totalDecoderPause, that ensures the decoder loop does nothing other than check its own pause state when completely paused. Aside from fixing a deadlock on channel changes, this should also speedup decoder changes under certain situations and probably prevents a couple of even more obscure bugs (e.g. if a seek is triggered at the same time as a channel change).
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