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| Who | What | When |
|---|---|---|
| merbanan | what tools should I use to test pid filter support when developing a driver ? | [01:38] |
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| *** | book`_ has quit IRC (Ping timeout: 244 seconds) | [04:08] |
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| merbanan | how do I trigger .read_signal_strength calls in a driver ? | [18:56] |
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| crope | merbanan: calling some ioctl which is likely very near that callback name | [20:30] |
| merbanan | crope: are there any existing tools ? | [20:30] |
| crope | merbanan: but it is all legacy dvbv3 api - new dvbv5 api uses different call
merbanan: tzap, czat, szap, femon dvbv5-zap does not use that old method | [20:30] |
| merbanan | ok | [20:31] |
| crope | good dvbv5 example is si2157 driver. and dvbv5-zap then shows signal strenght value | [20:33] |
| merbanan | crope: ok, I've restarted working on the astrometa stick | [20:34] |
| crope | merbanan: thats how pctv 292e reports http://pastebin.com/EJxu3mek
as you can see also how pids are listed Lock (0x1f) Signal= -59.00dBm C/N= 34.75dB signal and cnr | [20:36] |
| merbanan | ok, I implemented the old v3 api
thought something would use it anyway crope: I have a working fix for the firmware loading issue and then I need to fix the pid filter | [20:37] |
| crope | signal strenght is calculated by tuner driver (from different agc gains). so it should really go there. demod could estimate it very poorly, only limited resolution from IF | [20:38] |
| merbanan | well for the nm88472 the agc (signal strenght) is just 2 8 bit regs
crope: how did you test the pid filters code ? for dvbv5 that is | [20:40] |
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| mchehab | croppe, dvbv5 tools use the old method if you tell it to do it
crope: there's a command line fo rit s/fo rit/for it/ Usage: dvbv5-zap [OPTION...] <channel name> [or <frequency> if in monitor mode] DVB zap utility -3, --dvbv3 Use DVBv3 only ... the option is there to test legacy drivers | [21:13] |
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| crope | mchehab: ok, didnt noticed that earlier
merbanan: which kind of fw loading fix? | [21:53] |
| merbanan | mchehab: does libdvdv5 filter the ts stream if the hardware doesn't have pid filter support
crope: failure to load firmware | [21:55] |
| crope | merbanan: I assume those 2 agc registers are IF and RF AGC feedbacks | [21:55] |
| merbanan | something like that | [21:56] |
| crope | merbanan: does it still fail for some i2c error? | [21:56] |
| merbanan | mchehab: I patched dvb_set_pesfilter(fd, 0x2000, DMX_PES_OTHER to 0x1fff | [21:57] |
| crope | merbanan: I test pid filter just tuning to some channel and then looked stream contains only those pids | [21:58] |
| merbanan | I only got the 0x1fff pid but I never saw any calls in the driver to the pid functions | [21:58] |
| crope | tzap/dvbtraffic, dvbv5-zap --monitor | [21:58] |
| merbanan | crope: but I don't see any logs from the pid filter function | [21:59] |
| crope | pid 1fff is just for null padding stream | [21:59] |
| merbanan | I know | [21:59] |
| crope | merbanan: ok, you then dont use hw pid filters I think. just force hw pid filters | [21:59] |
| merbanan | I'm just not able to trigger my code
or technically your code | [21:59] |
| crope | modprobe dvb_usb_v2 force_pid_filter_usage=1 | [22:00] |
| merbanan | crope: I don't see any i2c errors, with a few exceptions
when the rtl28xx powers down the rtl2832 pll's when loading the firmware I just added a retry on the firmware load and now I can reliably always load it on first tune is there a way to say that a certain adapter needs pid filters to work properly ? | [22:01] |
| crope | does it need?
you could set DVB_USB_ADAP_NEED_PID_FILTERING | [22:04] |
| merbanan | well some guy reported that his qam256 muxes maxed out the usb bandwidth
I have a 6-7Mbit 0x1fff pid on my network | [22:06] |
| crope | if whole qam256 mux is out of usb bw, then there must be very many devices streaming same time
usb having no other devices streaming helps | [22:07] |
| merbanan | I guess that filtering away that pid takes down the bw to a working limit
sorry I meant the bridge bw limit rtl28xx hardware limit I guess it is close to max dvb-t limit | [22:08] |
| crope | have you tested it?
IIRC qam256 worked fine last time I tested it | [22:09] |
| merbanan | actually worked for me
the report I got was from a user that tested it on windows where it worked but got dropouts under linux | [22:12] |
| crope | I suspect it is still some other issue
I should test maximum possible bw using modulator to see if there is really some limit | [22:18] |
| merbanan | dvb-t2 has 50 Mbit/s
might be for some of those modes | [22:19] |
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| yey got hits in the pid code | [23:36] | |
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