#rockbox 2009-12-24

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#rockbox log for 2009-12-24

00:00:49		Quit Kitar\|st (Read error: 60 (Operation timed out))
00:00:54		Join Kitar\|st [0] (i=Kitarist@89.142.67.82)
00:01:32	Unhelpful	amiconn: coldfire would just use extension words? and coldfire takes 3 ops to do the construction, i think?
00:02:00	amiconn	yep
00:03:45	kugel	saratoga: that's so analog :)
00:04:09	saratoga	it was a good excuse to understand how the code works :)
00:04:12	saratoga	plus its not very complicated
00:09:34		Quit sagemfreak_ ("Verlassend")
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00:09:59		Quit Jaykay ("ChatZilla 0.9.86 [Firefox 3.5.6/20091201220228]")
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00:13:06	Jaykay	why did r24099 increase binsize on all targets? because of CREDITS?
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00:15:03	bertrik	Jaykay, IIRC, CREDITS is used by the credits plugin, so it should affect binsize
00:15:10	Jaykay	...and could the credits screen in rockbox be a plugin to save some kb? :)
00:15:23	gevaerts	Jaykay: it is
00:15:38	*	bertrik adds a NOT in there somewhere
00:16:07	JdGordon	Casainho: ping?
00:16:27	Casainho	JdGordon: pong
00:16:29	Jaykay	but the revision also increased ram usage on all targets... why?
00:16:41		Quit relentless ("Leaving")
00:16:52	JdGordon	Casainho: I'm finally trying to get rockbox on my mini24340 and I'm not having much lcuk with openocd...
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00:18:23	Casainho	JdGordon: did you follow the instructions here?: http://lyre.sourceforge.net/?q=content/mini2440-porting
00:18:49	Casainho	JdGordon: me and Bob_C, we got it... and I guess Domonoky also...
00:19:02	JdGordon	thats what I'm working through.... I've got openocd built, but cant get it to connect
00:19:16	JdGordon	the board/mini2440.cfg file has errors apparently
00:19:30	JdGordon	Error: target 'jedec_probe' not defined
00:20:29	Casainho	JdGordon: did you used openocd before?
00:20:34	JdGordon	no
00:20:55	Jaykay	bertrik, gevaerts: ?
00:21:14	bertrik	Jaykay, I don't know why it increased ram usage
00:21:16	Casainho	JdGordon: what is that jedec_probe?
00:21:36	Casainho	what JTAG cable/dongle are you using?
00:21:50	JdGordon	no idea.. its in the flash bank init code
00:21:53	JdGordon	the one supplied
00:22:59	gevaerts	Jaykay: it's because r24097 didn't get successfully autobuilt
00:23:05	Casainho	JdGordon: nor me nor Bob_C used that JTAG cable... looks like that one may work on Windows or something.
00:24:41	Jaykay	gevaerts: that means..?
00:24:55	Casainho	JdGordon: "If you are using Linux or prefer to use OpenOCD, the Mini JTAG adaptor can also be used with OpenOCD. It should be configured as a "triton" adaptor type. Scripts for OpenOCD are in the Hg repository under "tools/OpenOCD". "
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00:25:27	Casainho	JdGordon: did you make what Bob_C worte on that phrase?
00:27:01		Quit saratoga ("Page closed")
00:27:34	gevaerts	Jaykay: it means the delta you see isn't for only r24099
00:28:37	Jaykay	gevaerts: would you please explain that for a clueless user? :)
00:28:48		Quit Omlet ("( www.nnscript.com :: NoNameScript 4.22 :: www.esnation.com )")
00:32:22	amiconn	Hmm, "Show track info" has quite a bit of information, but the codec format is missing
00:32:23	gevaerts	Jaykay: the delta you see isn't for r24099 compared to r24098. It's for r24099 compared to the previous revision built
00:33:44		Quit merbanan (Read error: 60 (Operation timed out))
00:33:49		Quit Strife89 ("If you hold a Unix shell to your ear, you can hear the C.")
00:33:58	Jaykay	gevaerts: thanks, no i got it :)
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00:34:08	Jaykay	*now
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00:35:30	flyback	you guys know anything about HQRP brand lithium batteries
00:36:50	evilnick	flyback: Sounds like #rockbox-community talk there
00:37:57	flyback	fine
00:38:38	flyback	i'll probably get laid before I get an answer
00:38:40	*	flyback is 35
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00:44:57	CIA-6	New commit by amiconn (r24107): Assembler optimised bitreverse for ARM, again a little bit faster and smaller. * Separated 'x' and 'ret' gives gcc a bit more freedom regarding ...
00:47:58	n1s	amiconn: nice, first commit in a long time :)
00:48:13	n1s	how does the separation of x and ret help?
00:48:43	*	kugel thinks amiconn could've stuck to "mask" instead of "tmp", but well
00:49:10	amiconn	It's not the mask...
00:49:32	amiconn	The mask doesn't use a variable in the C version (but it does in the asm)
00:50:11		Quit dfkt ("-= SysReset 2.53=- Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.")
00:50:34	stripwax	amiconn - how much time does tremor decode spend in that particular bitreverse ?
00:50:44		Quit evilnick ("Page closed")
00:54:03	amiconn	[23:11:15] <n1s> amiconn: gives a speedup of 0.1% for 96kbps going up for higher bitrates to 0.7% for 500kbps on c200 over the version i committed earlier today
00:56:15	stripwax	cool
00:56:35	amiconn	JdGordon: The status bar still appears too early
01:00
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01:08:53	n1s	wow, with only 3 to 4 small changes rockbox built with gcc 4.4 boots and plays on h300
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01:10:03	n1s	i'll do some benching in the next few days
01:10:15	kugel	please do!
01:10:17	kugel	:)
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01:52:25	Ctcp	Ignored 4 channel CTCP requests in 0 seconds at the last flood
01:52:25	*	flyback decides to give the xmas tree animation hack one last chance to get done in time before giving up
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01:53:03	*	flyback bbl
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06:40:57	webguest08	are any developers on?
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06:44:38	Brendo	Are any developers online?
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06:54:38	*	flyback MUHAHAHAHA THE XMAS TREE HACK IS A GO!
07:00
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07:59:03	GodEater	anyone got any ideas about committing #10832?
08:00
08:02:28	JdGordon	who knows the AAC code?
08:02:40	GodEater	saratoga I think
08:03:01	GodEater	maybe linuxstb too?
08:05:10	JdGordon	codecs really shouldn't be touched without someone that actually knows the code giving it the ok :)
08:05:28	*	JdGordon is inspired by FS #8844 but wants to do it better
08:05:54	JdGordon	any ideas what the token for smart image exansion shuold be? I want it to be able to let you choose which image and which start and end subimages to add...
08:06:03	GodEater	indeed, but it looks ready to go - so I don't want it to linger in patch-hell, so I thought I'd bring it here for the logs :)
08:06:34	*	JdGordon thinks %xd\|a\|a\|z\| doesnt look very good
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08:13:08	CIA-6	New commit by jdgordon (r24108): Accept FS #8321 by Lee Kang Hyuk ...
08:13:43	JdGordon	more than 2 years on the tracker that one :p
08:17:11	GodEater	we should celebrate
08:17:13	GodEater	:D
08:25:08	GodEater	what's the deal with patches that are never going to make it into Rockbox core?
08:25:19	GodEater	should they get to hang around in the tracker, or should we be closing them?
08:25:53	GodEater	for example #2653 - it's changing the behaviour of the select button in the file viewer
08:27:01	JdGordon	I think the outcome last time the question came up was close them
08:27:45	GodEater	I agree, I don't see the point of leaving them there
08:27:51	GodEater	shall I?
08:29:32	JdGordon	I wouldnt mind one click insert functinoality
08:29:40	JdGordon	but yeah, its never going to go in
08:29:58	GodEater	there's another later patch which is still open which tries to do the same thing
08:30:04	GodEater	so you can have a go at that one ;)
08:30:42	GodEater	#9873
08:31:09	JdGordon	I think the way it could be done is a "set select button action" option in the context menu which would last for the duration of the browser, the options would be all the ones in the playlist context menu
08:31:24	GodEater	that seems reasonable
08:32:07	GodEater	I wish there was a column in flyspray that showed when a task was last edited
08:32:30	JdGordon	I of course wont waste my time though because it will inevitably turn into a "you're trying to bring customisability in blaa blaa blaa"
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10:59:19	q0_0p	anyone here know how to revive archos studio 20 after formatting the hdd?
10:59:49		Join evilnick [0] (i=5752157c@rockbox/staff/evilnick)
10:59:50	q0_0p	the archos website has the AJZ file but i have no clue what to do with it and i've tried rockbox installer
11:00
11:00:16	q0_0p	just clueless what to do right now. the hdd works like a hdd but when turn it on cannot play music so i assume firmware is not running good
11:02:37	q0_0p	is it critical to have the AJZ file?
11:02:53		Join faemir [0] (n=faemir@78.33.109.163)
11:03:58	evilnick	q0_0p: Have you searched for a way to reinstall the Archos firmware?
11:04:08	q0_0p	evilnick, could not find one online
11:04:17	q0_0p	evilnick, i have the AJZ file from archos site
11:04:24	q0_0p	evilnick, but not sure what to do with it
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11:04:47	q0_0p	evilnick, i've tried putting the AJZ file in the root of the drive
11:08:18	amiconn	The archos Studio's firmware file isn't called ajbrec.ajz, but archos.mod
11:08:32	amiconn	If it really is a Studio and you have an .ajz, you have the wrong file
11:09:03	amiconn	But the archoses have their firmware built-in, the on-disk version is just an optional upgrade
11:10:08	q0_0p	amiconn, http://www.archos.com/support/download/firmware/jukebox_mp3_player/5.07a/ajb6000_v5.07a.ajz
11:11:30	amiconn	Right file, wrong name. In order for a Studio to pick it up, it must be named archos.mod, and reside in the root of the drive
11:11:50	q0_0p	amiconn, so all i have to do is rename the file to archos.mod?
11:12:07	q0_0p	amiconn, that would be cool if that was the answer :)
11:12:12	q0_0p	amiconn, will try
11:12:17	*	amiconn wonders why archos have this obviously wrong filename (even with wrong extension) on their site
11:13:20	q0_0p	amiconn, i've successfully got rockbox to work once but then somehow it disappeared and stopped working
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11:14:20	pamaury	Does someone know if the rockbox loader resolves symbols at load time for plugins ?
11:15:19	amiconn	No
11:15:30	amiconn	Plugins are linked to a fixed address
11:16:27	amiconn	q0_0p: The archos Player/Studio's built-in original firmware sometimes fails to find an archos.mod in the root
11:16:54	q0_0p	amiconn, u think its a goner?
11:17:06	q0_0p	amiconn, seems like original firmware fails
11:17:10	amiconn	It depends on the state of the root directory (fragmentation etc)
11:17:24	q0_0p	amiconn, tried rockbox and it worked for a little bit
11:17:33	pamaury	Does someone knows thing about the zxbox plugin ? I'm trying to determine if we can safely export errno to plugins via rb and #define errno *rb->errno but it seems like zxbox (and others) is using errno and strerror whereas it's not accessible
11:17:50		Quit merbanan (Read error: 60 (Operation timed out))
11:17:54	amiconn	If you manage to make it load archos.mod again, rockbox should work too
11:18:25	pamaury	(perhaps it's dead code, I checked with a grep)
11:18:35	amiconn	Then you could check whether this archos is flashable (not all are). If it is, put rockbox in flash, and you won't have to worry about the OF not finding archos.mod anymre
11:19:01	q0_0p	amiconn, cool
11:19:33	q0_0p	pamaury, how do i check with a grep
11:19:59	q0_0p	pamaury, i only know how to grep when for example ls -la \| grep 'something i want'
11:20:13	amiconn	One method that will probably work is to format the drive, then put archos.mod on it as the first (and only) file. Better still, install rockbox directly after formatting
11:20:30	q0_0p	amiconn, will do that
11:20:33	amiconn	Be sure to format it as fat32, of course
11:20:43	q0_0p	amiconn, but when rockbox installs it also puts a foldoer called .rockbox
11:20:52	q0_0p	amiconn, should i rid that too? or keep it
11:21:10	amiconn	Keep it, it belongs to rockbox
11:21:21	amiconn	It shouldn't do harm.
11:21:38	q0_0p	amiconn, flashing the whole thing sounds like fun
11:21:45	amiconn	The main thing about a clean install after formatting is that the root directory won't contain deleted entries
11:22:31	pamaury	q0_0p: grep -R "errno" apps/plugins
11:22:59	q0_0p	pamaury, where is apps/plugins?
11:23:15	amiconn	I don't think anyone tried to track down why the OF sometimes fails to load archos.mod; my guess is that deleted files (maybe only earlier version of archos.mod) or even just a too large root directory confuse it
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11:23:47	pamaury	in the source code of rb but in a more general way, grep -R bla dir will search recursively for bla in files under directory dir
11:28:01	q0_0p	amiconn, how do i put rockbox in flash
11:28:09	q0_0p	amiconn, using rockbox utility?
11:28:22	q0_0p	amiconn, would that be the bootloader?
11:29:24		Quit merbanan (Read error: 60 (Operation timed out))
11:30:20	evilnick	q0_0p: Check the RB manual for that
11:31:13	evilnick	And it seems to be only for certain models of Archos players
11:32:11	q0_0p	evilnick, thx will look
11:36:37	evilnick	q0_0p: Check Advanced Topics then Rockbox in Flash - it took me a while to find, so hope that helps you!
11:37:35	q0_0p	evilnick, thx will read
11:38:34	q0_0p	evilnick, cool
11:39:09	q0_0p	evilnick, when i play the file can i play it in vlc or any media player?
11:39:32	q0_0p	evilnick, Play the file rockbox.ucl, or preferably rombox.ucl, and follow the instructions. The plugin handling this is rockbox_flash, a viewer plugin.
11:39:46	evilnick	It means to play it on the archos itself
11:39:50	q0_0p	evilnick, oh
11:40:01	q0_0p	evilnick, the problem with my archos is
11:40:06	q0_0p	evilnick, it wont even let me play music
11:40:13	q0_0p	evilnick, so i'm not able to file brose
11:40:19	q0_0p	evilnick, not able to file browse
11:40:31	q0_0p	evilnick, im stuck with a screen that says archos with the version number
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11:40:38	evilnick	Yes, so this is something you can do after fixing that problem
11:40:46	q0_0p	evilnick, ah
11:40:50	q0_0p	evilnick, make sense
11:42:38	pamaury	Does someone know if rocbox uses/can use host-side headers or if it's self-contained ?
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11:54:56	q0_0p	so once im able to load rockbox i can flash it
11:55:11	q0_0p	i pretty much have to beg the device to load it lol
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12:00:21	q0_0p	holy crap it works
12:00:42	q0_0p	i chose recorder 20 gig
12:00:51	q0_0p	strange cause i have jukebox studio 20
12:01:03	q0_0p	i chose jukebox recorder v2 20 gig
12:02:00	n1s	pamaury: afaik it's supposed to be self contained
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12:04:11	pamaury	That's what I would also say :) This errno problem could be more tricky than it seems. It would require to clean all plugins code to properly use errno. Or to modify errno.h to redirect to rb->errno when PLUGIN is defined.
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12:08:34	q0_0p	my archos cannot use mod extension?
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12:09:57	q0_0p	uses that weird ajz
12:10:10	pamaury	bertrik: I'm looking for advise about the errno issue in plugins. Do you have time for that ?
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12:24:42	bertrik	pamaury, sorry I don't have much time for that today
12:26:12	n1s	gcc 4.4 seems to be doing as one might expect on coldfire, some codecs are faster, some slower, tremor still takes a pretty big hit...
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12:36:01	q0_0p	do i have a bootloader problem?
12:36:07	q0_0p	sometimes it will load sometimes it will not
12:36:12	q0_0p	very random
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15:35:38	n1s	hmm aacHE, a52 and mpc are faster, aac and mp3 are pretty neutral and everything else s slower :(
15:36:57	n1s	where cook, vorbis and vw are in the 10-20% slower range :/
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16:13:49	Unhelpful	n1s: try playing with -O levels... i saw much larger differences between 4.0 and 4.4 with -O1 than at higher levels.
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16:26:01	pamaury	gevaerts: ping
16:26:36	gevaerts	pamaury: pon
16:26:42	gevaerts	g
16:28:34	pamaury	I had a look this morning at the errno issue we discuss yesterday and I got a fix but there are two things to note: first I had to modify errno.h because several plugins include it and I need to rename errno to *rb->errno. second, several plugins use or refer to errno, I have to check that such a would not break them. I checked and it compiles but could you have a look at it ? (see http://pastebin.com/d6c002fb6)
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16:30:27	gevaerts	why volatile?
16:31:29	pamaury	same as current_ticks, unintelligent copy paste I guess :)
16:31:47	gevaerts	current_ticks is updated from an interrupt handler I think
16:31:56	pamaury	yes I know, I'll change that :)
16:34:00	pamaury	I believe this patch is not sufficient, we need to change or fix a few plugins. For example in apps/plugins/lua/rocklibc.h
16:34:03	gevaerts	it looks as if only lua and pdbox actually ever use errno
16:35:04	pamaury	actually the following plugins refers to errno: zxbox, pdbox, png and lua. But that's grep result, it can be dead or commented code
16:35:43	gevaerts	zxbox is all commented out, png does refer to "extern int errno", but the variable is never read or assigned
16:35:57	pamaury	So we should delete this reference
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16:36:37	gevaerts	possibly
16:36:40	pamaury	pdbox seems to use errno for its own purpose.
16:36:54	gevaerts	that's ugly :\
16:37:33	gevaerts	oh well, I don't think it will break anything
16:37:35	pamaury	But I can't see a place where it's actually allocated because it can't be linked
16:38:03	gevaerts	maybe also commented out?
16:38:43	pamaury	Not sure, there's a static int rb_errno but I don't a #define errno rb_errno, still looking at the grep output
16:39:36	*	pamaury is looking more precisely at the code...
16:40:16	pamaury	lol:
16:40:25	pamaury	#ifndef ROCKBOX
16:40:28	pamaury	errno = 0;
16:40:28	pamaury	#endif
16:41:13	pamaury	that's the same everywhere, errno is not used when in rockbox. There is something to improve there but nothing will break
16:42:00	pamaury	So pdbox seems safe.
16:42:59	pamaury	That's ugly, lua defines a errno in rockaux.h and have a stub strerror
16:43:20	pamaury	Ugly but seems safe also
16:45:48	pamaury	gevaerts: do you think it's safe enough so I commit it ?
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16:54:29	gevaerts	pamaury: I think so
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17:50:37	n1s	Unhelpful: yeah, i'll try that, the codeclib is built with the core O level (Os for coldfire) and 3 of the biggest loosers are using the mdctlib...
17:57:51	kugel	the core's O level is Os for cf?
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18:07:22	CIA-6	New commit by pamaury (r24109): Add support for errno in plugins.
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18:11:04	kugel	pamaury: you could also have plugin.h define errno
18:11:25	kugel	I think posix defines errno to be a macro anyway (but I'm not sure)
18:12:11	kugel	maybe that wouldn't work with plugins including errno.h directly
18:12:11	gevaerts	kugel: all code that uses errno includes errno.h anyway
18:13:32	gevaerts	hm, you should probably have incremented the plugin API version
18:13:47		Quit GeekShado_ (Read error: 60 (Operation timed out))
18:15:34	gevaerts	pamaury: can you bump PLUGIN_API_VERSION?
18:16:35	kugel	hm, dircache wastes a lot even if disabled
18:16:58	*	kugel is inspired by FS #9506
18:17:01	kugel	JdGordon: ping
18:17:12	gevaerts	gah, sims and errno make things difficult
18:20:02	gevaerts	pamaury: maybe make the entire thing conditional on !defined(SIMULATOR)? In the sim, I suspect that the normal system errno is available to plugins anyway
18:22:33	*	gevaerts likes the idea of FS #9506
18:23:53	kugel	playling with it right now
18:25:53		Quit fyrestorm ("Ur skills' fireproof like a wooden panel -- U got feds talking leet on your IRC channel!")
18:26:03	kugel	HAVE_DIRCACHE alone adds ~50k binsize (unless bload-o-meter detects ram usage too but I doubt). 40k seems to be buffers which aren't used if dircache is off
18:26:51	pamaury	gevaerts: perhaps, I see that it don't compile on most target, that's strange
18:27:03	gevaerts	pamaury: I'm testing a fix now
18:27:15	gevaerts	pamaury: it's only on the simulators
18:28:09	pamaury	Do you have a fix ready?
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18:28:50	gevaerts	I think so. Just checking some last details
18:29:13	pamaury	And why does it fails with simulator ?
18:29:43	gevaerts	because then errno.h includes the system errno.h, which I suspect already defines errno as a macro
18:29:44	pamaury	Ah I think I understand
18:30:43	JdGordon	kugel: late pong
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18:31:46	gevaerts	Does anyone have a cygwin and/or mingw sim building setup available?
18:32:21	kugel	you mean if anyone in here is insane? :p
18:32:24	CIA-6	New commit by gevaerts (r24110): Fix building simulators (at least on linux. cygwin and mingw might need more work) ...
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18:32:56	JdGordon	kugel: pong
18:33:21	kugel	see a few lines up in the logs
18:33:42	kugel	I'm playing with that patch right now, I think it's a sensible thing to do
18:36:08	pamaury	gevaerts: and what about errno ? Perhaps there should be a SIMULATOR guard also.
18:36:27	pamaury	*errno.h
18:36:38	gevaerts	pamaury: look closely. It has one
18:37:57	JdGordon	kugel: yeah, I'm not so sure
18:38:15	JdGordon	it will make it harder to eventually be able to realloc all those buffers if we ever get there
18:38:46	JdGordon	and is 30K a noticable difference to anything?
18:39:04	kugel	wouldn't it make it easier?
18:39:11	pamaury	gevaerts: yes you're right
18:39:23	kugel	than reallocing a static buffer ?
18:40:17	gevaerts	pamaury: the bit I'm concerned about is that that errno.h guard also looks for cygwin and mingw
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18:49:01	pamaury	gevaerts: that's a bit strange you're right
18:49:22	gevaerts	rasher: ping
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19:30:56	Unhelpful	n1s: i have a LUT-free log2_int that works as nicely as the LUT version now. it does a lot of shift->add, which is not too nice on coldfire, but perhaps the fact that it works without loading anything from memory will be a help. :)
19:32:20	n1s	Unhelpful: nice, can the shift->add be done with a multiply on cf?
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19:34:22	Unhelpful	n1s: on the emac maybe, with the fractional mode. the shifts are rightward.
19:34:47	n1s	ah
19:36:00	Unhelpful	if we're going to go that way, things could be made even more ideal...
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19:36:39	n1s	that might require reconfiguring the emac though
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19:37:40	Unhelpful	don't we keep it in signed fractional mode when not in use?
19:39:16	n1s	dunno, some codecs set the mode when they init and assume it will remain until they exit...
19:41:23	n1s	mac and speex, seem to use integer mode, everything else fractional but different rounding modes
19:41:31	n1s	s/,//
19:42:18	Unhelpful	n1s: that should be fine, too... the mode is part of the thread state.
19:43:39	n1s	wouldn't the log function be called by the codecs (in the codec thread) so share the same thread state as the codec (or am i way off as usual :))
19:44:27	Unhelpful	n1s: ah, i'm referring to the specific fixed-point log2 used by aac :)
19:44:56	n1s	aha :)
19:53:47	Unhelpful	the solution we have now is likely the best one for floor_log2... it times best on pretty much everything.
19:54:03	n1s	yep
19:55:25	Unhelpful	here's the function: http://pastie.org/755821
19:56:43	Unhelpful	if you use the emac, you may as well get rid of the 1.5, 1.25, 1.125 etc multiplier scheme. these are only approximations of the ideal values of 2^(2^-1), 2^(2^-2), 2^(2^-3), etc.
19:58:08	Unhelpful	instead you'd want to load an approximation of the ideal values and use that as the multiplier. the subtracted values would also changed - they're the base-2 logs of the multipliers.
19:58:46	Unhelpful	essentially it's if (1.5x < 2) {x =1.5; result -= log2(1.5);} etc
20:00
20:00:13	Unhelpful	the final shift/subtract that's not part of a conditional sequence is approximating log(2/val), with val at this point being the remainder from the process done above.
20:00:24	n1s	i can't say i understand the algo
20:02:36	Unhelpful	n1s: you start with floor(log2(val)) as an estimate of the log. this is the log of (val*x) where x is some number less than 2... the rest of the algorithm is estimating that x, basically.
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20:03:05	Unhelpful	if you can multiply val by 1.5 and still have val <2, then do so, and subtract log2(1.5) from the result. then repeat for 1.25, 1.125, etc.
20:04:15	Unhelpful	you might want to replace __builtin_clz with a shift/add sequence sinc that will produce both the estimate and the shifted value directly.
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20:21:27	Unhelpful	n1s: here it is without __builtin_clz: http://pastie.org/755834
20:23:42	Unhelpful	that might make the algorithm a bit more clear... treating the input as unsigned fixed-point with 2.30 bits, keep multiplying by various values to get the input as close to 2.0 as possible.
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20:58:10	q0_0p	do i need a program to flash my archos studio?
20:58:31	q0_0p	just following these instructions
20:58:32	q0_0p	Select Plugins → Applications, and run the firmware_flash plugin. It will tell you about your flash and which file it is going to program. After pressing Menu it will check the file. If the file is OK, pressing On will give you a big warning. If we still didn’t manage to scare you off, you need to press Plus to actually program and verify. The programming takes just a few seconds.
21:00
21:08:40	Unhelpful	n1s: it's very slightly faster on armv4 w/o the benefit of clz, also... maybe just try the second version as-is on CF and commit if it's not slower, then worry about making it better w/ emac later?
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21:14:24	Unhelpful	benefit is: maximum error is 2^-14, the lowest representable error, no more use of large 64-value log2 table or bs_generic's table if we remove the unused log2_fix, and slight speed gain on at least two devices so far :)
21:15:24	q0_0p	Unhelpful, im not sure what i did but i have internalrom.bin files
21:15:42	q0_0p	Unhelpful, it seems to boot better, at first i was begging the archos to load rockbox
21:16:00	q0_0p	Unhelpful, i'm not sure what i did but i tried to flash it in the options?
21:16:43	Unhelpful	oop, it's missing something... re-pasted with the zero-input check: http://pastie.org/755897
21:17:56	Unhelpful	q0_0p: i don't know, i don't have an archos and have never seen one in person. you might need to wait a bit until somebody who knows what you're doing is around. the channel is logged, so if somebody gets back who knows they'll probably see that you asked :)
21:18:11	q0_0p	Unhelpful, cool
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22:00:13	q0_0p	i have a panic
22:00:18	q0_0p	panic ata:-11
22:00:23	q0_0p	is it dead?
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22:10:08	Unhelpful	n1s: there's only one callsite for log2_int without a zero guard around the call... i removed the zero guard in the function and added one there, it's a bit cheaper than having it in the function. amusingly this version is slooooooow on x86, which now gets 50% realtime on my system :)
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22:19:50	q0_0p	i'm able to mount my archos hdd
22:19:59	q0_0p	its able to go into usb mode
22:20:09	q0_0p	but when i load it regularly i get panic
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22:27:57	n1s	Unhelpful: yeah, no need to worry about emac now if it speeds it up on cf anyway, i'd say commit :)
22:28:57	q0_0p	is my archos dead?
22:29:41		Quit DerPapst ("Leaving.")
22:30:35	q0_0p	all i have is a screen that says rockbox
22:31:53	gevaerts	q0_0p: right now seems to be a really bad time to get archos experts...
22:32:04	q0_0p	darn
22:32:11	gevaerts	Today's particular date might be a reason...
22:32:33	q0_0p	was just wondering if its dead
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22:48:42		Quit fyrestorm ("Ur skills' fireproof like a wooden panel -- U got feds talking leet on your IRC channel!")
23:00
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23:42:55	Unhelpful	making log2_int(0) undef simplifies some other things as well
23:45:09	Unhelpful	the algorithm works without keeping a clear high bit that is equated to 2.0, for example... and that means that it can be coded so that it doesn't need to shift left if the high bit is set.
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