Hans Verkuil wrote:
> I'm not sure what the problem is. An application shouldn't have to care
> about whether an input is a S-Video, Composite or something else. The only
> exception is if it is a Tuner input, since that means that tuner related
> ioctls are available. Other than that, these names are just for the user.
I think an application should make things as much easy as possible for the
user. Let's suppose a user wants to record from his VHS-machine and plugs the
cable into the S-Video connector. Now he wants to switch to the appropriate
input. Do you suggest that he should first detect the number of the right
input by using v4l2-ctl ? Or testing different input numbers by
try-and-error? It is not the job of the user to know the input number of each
connector.
Using the pvrinput plugin, the user simply chooses "S-Video", and the plugin
sets the input to the appropriate input number - no matter if it is a PVR350
(input 1) or PVRUSB2 (input 2)
But things would be easier if we had a standard for naming the inputs.
>
> If you really need to switch to a tuner input to get the radio to work on
> ivtv, then that's an ivtv bug. Although according to Andy it works with
> cx18, so I'm surprised that it doesn't work with ivtv since cx18 is
> derived from ivtv. Can you double-check this?
You are right, simply opening the radio device works fine with ivtv.
I tried this also with pvrusb2 and discovered a problem:
Mike Isely wrote:
>Remember that opening /dev/radioX still produces the correct result.
>That is enough for any V4L radio application to use the driver without
>change.
Yes, opening the radio device works. The driver switches automatically to
input 3 (radio) and the tuner uses 62,5 Hz steps:
linvdr:~# v4l2-ctl -T -d 0
Tuner:
Capabilities : 62.5 Hz stereo
Frequency range : 65.0 MHz - 108.0 MHz
Signal strength : 25%
Current audio mode : bilingual
Available subchannels: stereo
linvdr:~# v4l2-ctl --get-input -d 0
Video input : 3 (radio)
But after closing the radio device, these settings still exist. The result is,
that tuning to a TV station does not work. I also checked this with v4l2-ctl:
v4l2-ctl -f 280.25 -d 0 gives no error (but also reports no success).
To be able to tune to a TV frequency I must first set the input to 0:
linvdr:~# v4l2-ctl -T -d 0
Tuner:
Capabilities : 62.5 Hz stereo
Frequency range : 65.0 MHz - 108.0 MHz
Signal strength : 25%
Current audio mode : bilingual
Available subchannels: mono
linvdr:~# v4l2-ctl --set-input 0 -d 0
Video input set to 0 (television)
linvdr:~# v4l2-ctl -f 280.25 -d 0
Frequency set to 4484 (280.250000 MHz)
linvdr:~# v4l2-ctl -T -d 0
Tuner:
Capabilities : 62.5 kHz multi-standard stereo lang1 lang2
Frequency range : 44.0 MHz - 958.0 MHz
Signal strength : 99%
Current audio mode : bilingual
Available subchannels: stereo
Is this a problem of the application (both v4l2-ctl and pvrinput-plugin), or
should the driver switch to the previous input (as it was before opening the
radio) after closing the radio device ?
Greets,
Martin
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