 Posted: Fri Dec 23, 2005 7:51 am |
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| waterhead |
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| Joined: 24 Apr 2005 |
| Posts: 299 |
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My directory is /dev/dvb/adapter0/frontend0, here's the result:
| Code: | | crw-rw-rw- 1 root mythtv 212, 3 Dec 20 07:41 /dev/dvb/adapter0/frontend0 |
I gave everyone full permission to the entire folder (I think)
| Code: | | chmod -R 777 /dev/dvb |
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| Posted: Fri Dec 23, 2005 7:58 am |
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| waterhead |
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| Joined: 24 Apr 2005 |
| Posts: 299 |
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Actually, I forgot to change permissions the last time I remodded the dvb driver. I just redid it, and here's the result:
| Code: | | crwxrwxrwx 1 root mythtv 212, 3 Dec 20 07:41 /dev/dvb/adapter0/frontend0 |
It seems that everything was working ok without changing permissions. |
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| Posted: Fri Dec 23, 2005 8:07 am |
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| waterhead |
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| Joined: 24 Apr 2005 |
| Posts: 299 |
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| Quote: | | If I use pchdtv's rules and permissions they stop xine-hd from working |
I dont have xine installed, but mplayer won't work. This may be why. |
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| Posted: Fri Dec 23, 2005 9:24 am |
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| fatbird |
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| Joined: 10 Nov 2005 |
| Posts: 11 |
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waterhead: There was an error in my last post. I asked for the result of 'ls -l /dev/dvb/frontend0' but I meant to say 'ls -l /dev/dvb/adapter0'. What you gave me works too.
I was looking for the group and permissions that pchdtv's udev generated because I think their settings weren't implemented properly on my machine and if so I was curious as to why. I'm not good at reading the udev rules but it looked like they should have created dev's with owner:group of root:users but what I got was root:root. This is a side issue to the problem with probing the card so I don't want to pursue it further here.
'crw-rw-rw- 1 root mythtv 212, 3' tells me that before you chmod you have owner:group of root:myth and permissions of 666. Have you tried using these permissions without chmoding? You shouldn't need execute permission and if you are a member of the mythtv group all you should need is the standard 660.
BTW, I took a quick look at the myth source and found the code that generates the error message.
| Code: | switch (CardUtil::cardDVBType(cardNumber.toInt(),name))
{
case CardUtil::ERROR_OPEN:
cardname->setValue(QString("Could not open card #%1!")
.arg(cardNumber));
cardtype->setValue(strerror(errno));
break;
case CardUtil::ERROR_PROBE:
cardname->setValue(QString("Could not get card info for card #%1!")
.arg(cardNumber));
cardtype->setValue(strerror(errno));
break;
.
.
.
case CardUtil::ATSC:
cardtype->setValue("ATSC");
cardname->setValue(name);
break; |
I'm not very good at C++ but I gather that if CardUtil had probed the card it would have set cardtype to ATSC and cardname to the appropriate value but instead CardUtil got ERROR_PROBE so myth definately failed at this point. I next need to track the CardUtil function back to where it got ERROR_PROBE and see if I can figure out why. Qiven my level of (non)expertise, this could take a while but if I ever sort it out I'll report back. |
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| Posted: Fri Dec 23, 2005 9:57 am |
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| fatbird |
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| Joined: 10 Nov 2005 |
| Posts: 11 |
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waterhead:
Sorry, I was so busy writing my last opus that I didn't see your last 2 posts.
You wrote:
| Quote: | | It seems that everything was working ok without changing permissions. |
I wrote:
| Quote: | | 'crw-rw-rw- 1 root mythtv 212, 3' tells me that before you chmod you have owner:group of root:myth and permissions of 666. Have you tried using these permissions without chmoding? |
Answered before asked.
You wrote:
| Quote: | Quote:
If I use pchdtv's rules and permissions they stop xine-hd from working
I dont have xine installed, but mplayer won't work. This may be why. |
I was wondering where your dvb devices got assigned to the myth group and why the permissions were 666 rather than 660. You must either have different udev rules than I do or a script that is chown'ing and chmod'ing /dev/dvb.
At [url] http://linuxgazette.net/118/knaggs.html
[/url] the author says modprobing cx88-dvb should result in ls -l /dev/dvb/adapter0 reporting:
| Quote: | crw-rw---- 1 root video 212, 4 2005-07-31 22:42 /dev/dvb/adapter0/demux0
crw-rw---- 1 root video 212, 5 2005-07-31 22:42 /dev/dvb/adapter0/dvr0
crw-rw---- 1 root video 212, 3 2005-07-31 22:42 /dev/dvb/adapter0/frontend0
crw-rw---- 1 root video 212, 7 2005-07-31 22:42 /dev/dvb/adapter0/net0 |
with allowance for different date and time. As I posted earlier, this is what I get from the standard udev rules. Whether the fact that you have your dvb devices assigned to a myth group rather than the video group is preventing mplayer from working I couldn't say but both xine-hd and mplayer work for me with the video group. (That last senrence is worthy of Dickens but I don't have the energy to restructure it). |
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| Posted: Fri Dec 23, 2005 10:52 am |
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| waterhead |
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| Joined: 24 Apr 2005 |
| Posts: 299 |
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| Quote: | | I was wondering where your dvb devices got assigned to the myth group and why the permissions were 666 rather than 660. You must either have different udev rules than I do or a script that is chown'ing and chmod'ing /dev/dvb. |
Somewhere, while trying to work out my problems, I came across this suggestion.
Create a file:20-dvb.permissions and enter into it dvb/adapter[0-3]*/*:root:mythtv:0666
I don't currently have this file, but somewhere along the way I modified the 10-pchdtv.permissions file to reflect the same thing. As you say, this may not be needed anymore.
I also modified the file 50-udev.rules under Kernel=="dvb*" to include the group "mythtv", and gave it a mode of 0666.
I was following suggestions from other posts, and when everthing worked, I just kept it as is. |
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| Posted: Fri Dec 23, 2005 11:00 am |
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| waterhead |
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| Joined: 24 Apr 2005 |
| Posts: 299 |
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Here's the result of 'ls -l /dev/dvb/adapter0':
| Code: | crwxrwxrwx 1 root mythtv 212, 4 Dec 20 07:41 demux0
crwxrwxrwx 1 root mythtv 212, 5 Dec 20 07:41 dvr0
crwxrwxrwx 1 root mythtv 212, 3 Dec 20 07:41 frontend0
crwxrwxrwx 1 root mythtv 212, 7 Dec 20 07:41 net0
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As you see I already changed permissions. |
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| Posted: Mon Dec 26, 2005 10:33 am |
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| fatbird |
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| Joined: 10 Nov 2005 |
| Posts: 11 |
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Here's the code from videosource.cpp in mythtv that probes the card:
| Code: | enum CardUtil::DVB_TYPES CardUtil::cardDVBType(unsigned nVideoDev, QString &name)
{
DVB_TYPES nRet = ERROR_OPEN;
#ifdef USING_DVB
int fd_frontend = open(dvbdevice(DVB_DEV_FRONTEND, nVideoDev),
O_RDWR | O_NONBLOCK);
if (fd_frontend >= 0)
{
struct dvb_frontend_info info;
nRet = ERROR_PROBE;
if (ioctl(fd_frontend, FE_GET_INFO, &info) >= 0)
{
name = info.name;
switch(info.type)
{
case FE_QAM:
nRet = QAM;
break;
case FE_QPSK:
nRet = QPSK;
break;
case FE_OFDM:
nRet = OFDM;
break;
#if (DVB_API_VERSION_MINOR == 1)
case FE_ATSC:
nRet = ATSC;
break;
#endif
}
}
close(fd_frontend);
}
#else
(void)nVideoDev;
(void)name;
#endif
return nRet;
} |
The relevent line is:
| Code: | if (ioctl(fd_frontend, FE_GET_INFO, &info) >= 0)
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This is the same mechanism used in azap, which has no problem probing the card.
| Code: | if (ioctl(fe_fd, FE_GET_INFO, &fe_info) < 0) {
PERROR("ioctl FE_GET_INFO failed");
return -1;
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This is all moot now because yesterday I noticed an updated version of mythtv on the Arch Linux repositories and installed it. Now, with all the same configurations as before, I get the card info and can do a channel scan, which found one more channel than I realized I had.
Problem resolved. |
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