Beirdobot, irc.freenode.net

Monday, October 27th, 2014, 01:33 UTC

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jya:

peper03: the AudioFramework::buffer always aim to have at least 500ms of hardware buffer.

[02:41:48]

jya:

any value over that is a bonus, another regression introduced with lvr patches by the look of it… maybe we should just revert the entire thing related to the visualiser.. too many problems

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espes__:

jya: might be of interest: https://github.com/espes/Slave-in-the-Magic-Mirror

[03:56:57]

jya:

espes__: Apple has removed the check on FairPlay being supported?

[03:57:17]

espes__:

no. I just implement airplay by emulating the code from airtunesd

[03:57:19]

espes__:

fairplay*

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[03:57:36]

espes__:

(which is actually what all the commercial apps do aswell)

[03:58:01]

jya:

that’s pretty much why I never implemented it… mirror only works if we report FairPlay in the bonjour announcement, and that breaks both audio (airtune) and video playback

[03:58:44]

jya:

yeah, but AFAIK, none of them implemented airtunes.

[03:59:08]

espes__:

is it different? mirroring audio goes over airtunes

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[04:00:28]

jya:

see: you do : 'et': u'0,3', #supported encryption types

[04:00:34]

jya:

the ‘3’ is FairPlay

[04:00:40]

jya:

rather than ‘1’ which is RSA

[04:00:57]

jya:

so unless you do support FairPlay, audio only will not work any longer

[04:00:59]

espes__:

'no' as in apple hasn't removed the check

[04:01:09]

espes__:

like I said, I implement fairplay

[04:01:20]

jya:

where did you get the key?

[04:01:22]

espes__:

(by emulating code from airtunesd)

[04:02:34]

espes__:

it doesn't use anything in-hardware

[04:03:06]

jya:

well, you are using a key…

[04:03:13]

jya:

and that won’t pass mythtv OSS requirements

[04:03:30]

jya:

but very cool nonetheless

[04:03:50]

jya:

been waiting to find someone who implemented fairplay for a while

[04:03:55]

jya:

didn’t it had been hacked

[04:04:01]

jya:

didn’t know that is

[04:04:51]

espes__:

not hacked, just emulated :/

[04:05:07]

espes__:

I was looking at REing it but it's all retardedly obfuscated

[04:05:31]

jya:

unless, I don’t read your code properly, you have embbeded a key in there

[04:05:35]

espes__:

so how does mythtv provide the RSA private key? does it need it?

[04:05:40]

jya:

that key has to got from somewhere

[04:05:44]

jya:

it doesn't

[04:06:03]

jya:

it checks if the user has created a particular file that contains a RSA key

[04:06:16]

jya:

we only check if it’s a valid RSA key.

[04:06:26]

jya:

myth source code contains no key whatsoever

[04:06:31]

espes__:

sure

[04:06:45]

espes__:

so the same could work with providing a copy of airtunesd :P

[04:07:18]

jya:

does that work with a real iPhone or mac mirror?

[04:07:24]

jya:

or only with airtunes client?

[04:07:39]

espes__:

?

[04:07:40]

espes__:

like

[04:07:41]

espes__:

https://github.com/espes/Slave-in-the-Magic-M . . . aster/drm.py

[04:08:13]

espes__:

airtunesd is the airtunes daemon from appletvs, right

[04:08:35]

jya:

well, goog work extracting that key nevertheless

[04:08:48]

espes__:

no key extracted!

[04:09:17]

espes__:

lterally just call the code from airtunesd to do the decryption

[04:10:10]

jya:

what do you mean you call airtunesd to do the decryption?

[04:10:52]

espes__:

https://github.com/espes/Slave-in-the-Magic-M . . . r/drm.py#L92

[04:11:11]

jya:

so your code only works on an ATV2 ?

[04:11:35]

espes__:

no, there's an arm emulator

[04:12:00]

jya:

and you run the original ATV binary image?

[04:12:04]

espes__:

yeah

[04:12:09]

jya:

that’s fancy !

[04:18:30]

jya:

espes__: wait.. you emulate the ATV AFP code in python?

[04:18:36]

espes__:

yup :P

[04:18:57]

jya:

and how did you get the ATV AFP code?

[04:19:12]

jya:

surely, if you got that far, you could reimplement it all

[04:19:15]

jya:

no need to emulate

[04:19:24]

espes__:

it's really obfuscated

[04:19:44]

jya:

this is insane !

[04:19:44]

espes__:

so you can easilly extract airtunesd from the ATV firmware

[04:20:12]

espes__:

need the firmware decryption key rhough

[04:20:23]

jya:

and how do you get that one?

[04:21:14]

espes__:

https://ipsw.me/keys/AppleTV2,1/9A334v

[04:21:16]

espes__:

:P

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[09:07:02]

stuarta:

morning all

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[10:33:51]

peper03:

jya: I'm not sure what other commits were made but determining the amount of audio data buffered based on time rather than bytes seems sensible to me. I know I've encountered situations in the past where many seconds of audio data were buffered (something like 8 or 10).

[10:34:26]

jya:

1s certainly seems like a reasonable amount

[10:34:43]

peper03:

Apart from situations where the music is blaring out and you can't turn the volume down straight away, that's an awful lot of lag.

[10:35:06]

jya:

well, that’s only true with software audio

[10:35:14]

jya:

software volume I mean

[10:35:42]

jya:

with a proper mixer wouldn’t matter how much we buffered

[10:35:50]

peper03:

Of course.

[10:36:58]

peper03:

But that's also why I wanted to check that lowering the maximum buffer size in time wouldn't break some setup I don't have or haven't thought about.

[10:38:25]

jya:

i can’t think of any

[10:38:36]

jya:

which at this time of day and with my current cold doesn’t mean much :)

[10:39:38]

peper03:

Are there any big differences between LiveTV in master and 0.27 at the moment? I know you did quite a bit of work a while back but I'm not sure how much of it was backported.

[10:40:23]

peper03:

From my testing over the weekend, it seemed like LiveTV was often playing just a fraction too close to the end of the file.

[10:41:23]

peper03:

Not always but quite often. Pausing just for a fraction of a second usually seemed to be enough.

[10:44:13]

peper03:

Admittedly, it's rare that I use LiveTV (usually only for some radio channels) but I would have thought others would have complained on the mailing list or forum if 0.27 had the same issues.

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Seeker`:

peper03: it causes stuttering? I'm running quite close to the head of master and i'm not seeing any problems

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peper03:

Seeker`: Not always and if it does, it's only mild (of course, that's bad enough). I added some logging to RingBuffer::WaitForAvail to output when the ringbuffer stalls and it spits out quite a bit. It's not always associated with stuttering but it gives the impression that it's probably not far off.

[12:43:39]

peper03:

Pausing playback briefly seems to fix it, which backs up my suspicion that we might be just a little bit too close to live.

[12:49:50]

stuartm:

there's a balancing act between starting livetv and changing channel as fast as possible, but still having enough buffered to avoid starvation

[12:51:38]

stuartm:

which is patently obvious

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stuartm:

in other news the Sky is blue, and apples fall from trees

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** stuarta repaints sky purple and hands stuartm a rainbow coloured apple **

[12:59:46]

stuartm:

got to run, but I did have a more serious question to ask about how we decide that we've buffered enough to start playback

[13:16:42]

peper03:

stuartm: I'm not entirely sure. I'm having a heck of a time working out how it all works. There is a variable 'secs_min' in RingBuffer::CalcReadAheadThresh that has the comment 'minimum seconds of buffering before allowing read'.

[13:18:55]

peper03:

It's currently set to 0.3. I've tried increasing it but it doesn't always seem to have the expected effect. It seems like there's a difference between starting LiveTV and changing channels. I've bumped that value up to two or three seconds and still seen the OSD show that playback was barely more than a second behind live.

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tgm4883:

If there is ever an argument for taking away tools from the users, it's this guy right here http://ubuntuforums.org/showthread.php?t=2248 . . . post13152502

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stuarta:

that's extreme hacking. i admire the skill level required to do that

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tgm4883:

stuarta: eh, perhaps. But it seems like taking a nuke to kill an ant to me

[15:31:22]

stuarta:

there is only 1 upside to doing it that way, if the endpoint ever changes ip address, that method will continue to work

[15:32:29]

jheizer:

That's dedication to not upgrading or building from source.

[15:33:09]

stuarta:

yeah, 0.21? positively antique

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dekarl-work:

anybody up for some custom recording rule examples? (record on any channel but x, y, z) https://forum.mythtv.org/viewtopic.php?f=9&t=427 maybe add it to https://www.mythtv.org/wiki/Custom_Recording too

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jpabq:

stuarta: are you able to set me up an account on mythtv.org? I need to tweak the theme packaging.

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stuartm:

jpabq: sorry, I meant to redirect you to stuarta last night

[20:34:56]

jpabq:

NP. After thinking about it, I realized he was the right person to ping.

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stuartm:

I've got the perms, but he's the expert

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jpabq:

I figured that was the case.

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