Messages in this thread | | | Date | Fri, 9 Apr 2010 19:34:00 -0400 | Subject | bt878/msp3445 Audio Channel Swapping | From | Paul Braman <> |
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Maybe this is something that just "everyone already knows" but I can't find documentation about it. In several kernels I've tried, most recently 2.6.30, the drivers for NTSC tuner cards with AV inputs have their left-right channels swapping coming out of the ALSA drivers. Both the RF and AV inputs are like this. However, with the bt878/msp3445 combination, switching back and forth from RF and AV can actually induce swapping channels *back* to their original assignments (and back and forth, etc, upon source switching).
The best we've been able to figure, the drivers or the hardware is dropping samples so the stereo interleaving is getting reversed. It only happens when the audio mux is mutated to a different configuration but it's not deterministic so it's very hard to track, for example, true stereo left/right. Is this just a known problem that everyone deals with?
Paul Braman Lead Software Engineer The Nielsen Company
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