Tvheadend

You may try to swap master/slave devices. Appearently, if the order is wrong (slave is first at the load time), the config is not restored properly, because master does not exist.

Jaroslav Kysela wrote:

You may try to swap master/slave devices. Appearently, if the order is wrong (slave is first at the load time), the config is not restored properly, because master does not exist.

Thanks. I will have to create some udev rules to specify the adapter names statically, so that the master device will always get the /dev/adapter0 entry.

Trex the Daemon wrote:

Jaroslav Kysela wrote:

You may try to swap master/slave devices. Appearently, if the order is wrong (slave is first at the load time), the config is not restored properly, because master does not exist.

Thanks. I will have to create some udev rules to specify the adapter names statically, so that the master device will always get the /dev/adapter0 entry.

Well, I've just checked the startup log and what we've assumed here seems to not be the reason:

Jun 12 15:22:45 raspberrypi tvheadend[21472]: linuxdvb: adapter added /dev/dvb/adapter2
Jun 12 15:22:45 raspberrypi tvheadend[21472]: linuxdvb: adapter added /dev/dvb/adapter1
Jun 12 15:22:45 raspberrypi tvheadend[21472]: linuxdvb: adapter added /dev/dvb/adapter0


So adapter 2 is the master adapter, and adapter 1 is the slave. If we take the order of the addition of the adapters, the master does exist before the slave is added.

Could you tell me where is this part of the code implemented ? Maybe I can have a look to see if I can find something there..

It seems that the order should not matter. The master tuner should be identified just using the uuid string. Check linuxdvb_frontend_create() linuxdvb_frontend_save() in src/input/mpegts/linuxdvb/linuxdvb_frontend.c . Look for 'master for #' strings.

Jaroslav Kysela wrote:

It seems that the order should not matter. The master tuner should be identified just using the uuid string. Check linuxdvb_frontend_create() linuxdvb_frontend_save() in src/input/mpegts/linuxdvb/linuxdvb_frontend.c . Look for 'master for #' strings.

I've just checked in the config file the UUID and they are correct.
I'll have a look in the code...

There must be something wrong - linuxdvb_frontend_dvbs_slave_class is not probably used for the slave.

Jaroslav Kysela wrote:

There must be something wrong - linuxdvb_frontend_dvbs_slave_class is not probably used for the slave.

I've checked the code but I'm not quite getting what here is meant:
/* Tuner slave */
snprintf(buf, sizeof(buf), "master for #%d", number);
if (conf && type == DVB_TYPE_S) {
muuid = htsmsg_get_str(conf, buf);
if (muuid && uuid && !strcmp(muuid, uuid))
muuid = NULL;
}

It gets the uuid of the master I suppose, and then checks to make sure that the master and the slave uuids are different ? What's the reason for that?

Later on, depending if we have a master uuid, it will use the correct pointer:
if (type == DVB_TYPE_S)
idc = muuid ? &linuxdvb_frontend_dvbs_slave_class : &linuxdvb_frontend_dvbs_class;

so this should be fine..

Trex the Daemon wrote:

Jaroslav Kysela wrote:

There must be something wrong - linuxdvb_frontend_dvbs_slave_class is not probably used for the slave.

I've checked the code but I'm not quite getting what here is meant:
/* Tuner slave */
snprintf(buf, sizeof(buf), "master for #%d", number);
if (conf && type == DVB_TYPE_S) {
muuid = htsmsg_get_str(conf, buf);
if (muuid && uuid && !strcmp(muuid, uuid))
muuid = NULL;
}

It gets the uuid of the master I suppose, and then checks to make sure that the master and the slave uuids are different ? What's the reason for that?

Later on, depending if we have a master uuid, it will use the correct pointer:
if (type == DVB_TYPE_S)
idc = muuid ? &linuxdvb_frontend_dvbs_slave_class : &linuxdvb_frontend_dvbs_class;

so this should be fine..

Well, this issue is still present, now on a different device..

Have you had verified (use printf or gdb) if linuxdvb_frontend_dvbs_slave_class is really used for the slave frontend?

Trex the Daemon wrote:

Jaroslav Kysela wrote:

Have you had verified (use printf or gdb) if linuxdvb_frontend_dvbs_slave_class is really used for the slave frontend?

Sorry, did not have time to debug this.
Meanwhile I've changed the dvbsky to another sundtek tuner, and the same issue happens also here, after reboot, the tuner that was configured as slave looses it's settings and will become master again with "Universal LNB".
Interesting is, that in the config file it looks ok.
44128f8e1ad13b8417dac31e4e12521e is the master, and 65cce2b6dc875ed17dffe0c5ee91c5c5 is set as slave (see the logs).

Tvheadend version is 4.3-1774, but it's already present in previous 4.3 version.
However, in stable 4.2 it's not!

Also, Ive checked that if in the list, the slave tuner is the second, it will also show as master, so the position during initalization does not matter.

The bug is caused as follows: In linuxdvb_frontend_create,
on entry, conf points to "frontends", but is value is overwritten

by the following code:

  /* Internal config ID */
  snprintf(id, sizeof(id), "%s #%d", dvb_type2str(type), number);
  if (conf)
    conf = htsmsg_get_map(conf, id);

The key,value pair for "master for #0" is part of the "frontends" map
but it is now looked up in "DVB-S #0" instead, and is not found.

The solution is to save the initial value of conf, and then to use it
for looking up "master for #0" . E.g.:

linuxdvb_frontend_t *
linuxdvb_frontend_create
  ( htsmsg_t *conf, linuxdvb_adapter_t *la, int number,
    const char *fe_path, const char *dmx_path, const char *dvr_path,
    dvb_fe_type_t type, const char *name )
{
  const idclass_t *idc;
  const char *str, *uuid = NULL, *muuid = NULL;
  char id[16], lname[256], buf[256];
  linuxdvb_frontend_t *lfe;
  htsmsg_t *scconf;
  ssize_t r;
  int fd;
  htsmsg_t * oldconf =conf;

  /* Internal config ID */
  snprintf(id, sizeof(id), "%s #%d", dvb_type2str(type), number);
  if (conf)
    conf = htsmsg_get_map(conf, id);
  if (conf)
    uuid = htsmsg_get_str(conf, "uuid");

  /* Tuner slave */
  snprintf(buf, sizeof(buf), "master for #%d", number);
  if (conf && type == DVB_TYPE_S) {
    muuid = htsmsg_get_str(oldconf, buf);
    if (muuid && uuid && !strcmp(muuid, uuid))
      muuid = NULL;
  }
...

However, the above code change is not sufficient.

A slave tuner should be able to tune to the same network as its master tuner.
In reality it refuses to tune to anything, unless a list of networks is filled
in the adapter config file. However, there is no way of setting this list
of networks from the web ui.

I also noticed that even after setting the field "master tuner", the web ui still
shows information for switches, which it should not do.

How is this supposed to work?
I assume that the user should NOT set networks for the slave tuners,
but then the code should use the networks from the master and it does not.
Perhaps still another bug?

Deep Thought wrote:

However, the above code change is not sufficient.

A slave tuner should be able to tune to the same network as its master tuner.
In reality it refuses to tune to anything, unless a list of networks is filled
in the adapter config file. However, there is no way of setting this list
of networks from the web ui.

I also noticed that even after setting the field "master tuner", the web ui still
shows information for switches, which it should not do.

How is this supposed to work?
I assume that the user should NOT set networks for the slave tuners,
but then the code should use the networks from the master and it does not.
Perhaps still another bug?

Hello,
Well, all I can say is that on 4.2, once you've set the tuner to "slave" and restarted tvheadend, from the gui all other settings, as network mapping disappeared. I've tested by occupying one of the tuners and then requested a second channel, from the same polarity and orbital position. Tvheadend then used the slave tuner to tune and serve the second request.
So for some reason, this has been broken in the 4.3 versions.

Yes, my comment was about 4.3. With the above patch, the slave tuner status is permanent (which
is good). The settings which should be hidden eventually are hidden, but not immediately.

I did discover that if you add the networks of the master in the config file of the slave,
the slave tuners can be used. However, this does not sound like the correct solution,
as the slave tuner should simply use the same network as the master tuner.

Retest with v4.3-1787-g453ee8dfd .

I have tested and can confirm that this problem is now
solved.

Thanks

There still is one problem: when initially configuring a slave tuner, you need to
check some boxes for each of the wanted networks. However, after a restart of tvheadend,the
screen to change these choices is missing.

Same problem Configured as slave - LNB types/diseq menus are still present until reboot. Now configured back to "This tuner" master, and diseq menus are not coming back, reboot didn't help, stuck as blank. So annoying.

Manual fix of how to recover after Slave-to-Master setting:
Open with text editor /home/hts/.hts/dd570f6f5b314dbed3920c96e5b858fa (see your ID in the folder of the adapter in question)
find "master for #0": "" and remove the line, save and restart tvheadend.

FIX IT FOR GOD'S SAKE, ticket is 1 y old!!!

Victor S wrote:

FIX IT FOR GOD'S SAKE, ticket is 1 y old!!!

It is fully open source software which is provided for free. You should stop demanding something from others and start fixing it on your own!

If you make an opensource, then make it useable and don't ignore stuff years old reported, this type of ignorance just pisses off. And you waiting credits for that?

Victor S wrote:

If you make an opensource, then make it useable and don't ignore stuff years old reported, this type of ignorance just pisses off. And you waiting credits for that?

It's not that the 'bug' is 'ignored' as you put it, but rather there aren't enough developers that have free time to work on tvheadend right now. You "swearing and screaming bloody murder" helps no one, in fact it puts people off, users and developers alike, so thanks for that.

As for your 'bug', it's a very simple one and I myself suffer with it. I did some testing and found that the sub-devices of the pci card actually change or swap dvb device (/dev/dvb) positions on each reboot. This is down to the kernel and/or driver not using set positions for each sub-device. Tvheadend could handle this better but how is it supposed to detect which device is supposed to be master or slave when they keep doing musicial chairs?

Victor S wrote:

Shame on you.

It's more shame on you. You haven't contributed a single line of code and demand that something is fixed by others. I am not sure what gave you the impression that you can tell others what they should do but that impression is completely wrong.

As Mark mentioned correctly: By complaining in a rude manner you will only make sure that this issue is not fixed. Nobody wants to help someone who says "shame on you". Obviously you also didn't read the license which clearly states that there is absolutely no warranty, not even implicit warranty that this software is useful. And that is exactly what you got, so I am not sure what exactly gave you the impression that this software should work for your purpose, the license explicitly states that it may or may not work. If you want something that you can complain about and demand to be working you need to find a company that focuses on software development and have them write a software for you that works for your purpose.