On Sat, 2010-04-10 at 23:21 -0400, Mark Lord wrote: > On 10/04/10 06:54 PM, Andy Walls wrote: > > > > Hmmm. Darren's having problems (loss of video/black screen) with my > > patches under my cx18-audio repo, but I'm not quite convinced he doesn't > > have some other PCI bus problem either. > > > > Anyway, my plan now is this: > > > > 1. on cx18-av-core.c:input_change() > > a. set register 0x808 for audio autodetection > > b. restart the format detection loop > > c. set or reset a 1.5 second timeout > > > > 2. after the timer expires, if no audio standard was detected, > > a. force the audio standard by programming register 0x808 > > (e.g. BTSC for NTSC-M) > > b. restart the format detection loop so the micrcontroller will > > do the unmute when it detects audio > > > > Darren is in NTSC-M/BTSC land. What TV standard are you dealing with? > .. > > I'm in Canada, using the tuner for over-the-air NTSC broadcasts. Try this: http://linuxtv.org/hg/~awalls/cx18-audio2 this waits 1.5 seconds after an input/channel change to see if the audio standard micrcontroller can detect the standard. If it can't, the driver tells it to try a fallback detection. Right now, only the NTSC-M fallback detection is set to force a mode (i.e. BTSC), all the others "fall back" to their same auto-detection. Some annoyances with the fallback to a forced audio standard, mode, and format: 1. Static gets unmuted on stations with no signal. :( 2. I can't seem to force mode "MONO2 (LANGUAGE B)". I'm guessing the microcontroller keeps setting it back down to "MONO1 (LANGUAGE A/Mono L +R channel for BTSC, EIAJ, A2)" Feel free to experiment with the LSB of the fallback setting magic number (0x1101) in cx18-av-core.c:input_change(). Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
