[mythtv] Alsa capture support
Matthew Wire
devel at mrwire.co.uk
Thu Aug 24 10:58:14 UTC 2006
> Well, I for one have always used v4lctl to unmute and set the volume for my
> SAA7134 cards, OSS or ALSA. I also make sure (in the case of saa7134-alsa) to
> set 'video' to the recording source and turn it up about 75-85%.
>
> My v4lctl lines:
>
> v4lctl -c /dev/video0 volume mute off
> v4lctl -c /dev/video0 volume 13
Well I didn't think I had the option of using v4lctl until I found that
I need to install xawtv-tools on ubuntu (edgy).
Sure enough, the problem is that my card is muted. Unmuting using v4lctl
works correctly.
>
> MPlayer, TVtime, etc. unmute that setting while playing and then mutes it
> again on exiting so if you use any other program to watch TV than MythTV
> you'll need to unmute the volume yourself. At least that's my experience.
That seems to be correct
>
> I haven't tried your arecord line yet, but it would certainly be interesting
> if that works without unmuting the volume...
Unfortunately it won't. Think I mislead you there, I was running
arecord with tvtime running so tvtime would have unmuted the card for
me.
At any rate, it seems to me that mythtv should probably be
muting/unmuting the card as necessary. Can anyone point me to the right
place in the code to try and implement this?
I did have a go at writing alsa capture support and got to the stage
where it would make clicking sounds, but then got very muddled with
buffer sizes/periods etc. so that plan may have to sit on the back
burner for a while...
Matthew
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