IRC log of #maemo for Wednesday, 2014-04-02

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louisdkThis is funny. I've owned an N900 for years but didn't knew that you could swipe from the right to see your lastest visited websites in the browser.01:08
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DocScrutinizer05~gestures01:13
infobotftp://ftp.handhelds.org/pub/projects/xstroke/release-0.1/alphabet.ps01:13
DocScrutinizer05umm, not this one01:13
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DocScrutinizer05~#maemo gestures is http://wiki.maemo.org/N900_shortcuts_and_gestures01:15
infobotDocScrutinizer05: okay01:15
RiDlouisdk there is also some key combo (ctrl shift i? i don't remember) that enabled/disabled text "reflow"01:15
DocScrutinizer05~#maemo shortcuts is <reply> see #maemo gestures01:15
infobotokay, DocScrutinizer0501:15
RiDCtrl + Shift + I Reset zoom to normal or Turn on page reflow for any zoom level | i was right :v01:16
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zGrrmoin :)11:42
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MaxdamantusHmm .. turns out dmix seems to use a significant amount of CPU :(14:56
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* Maxdamantus wonders how pulseaudio uses less CPU.15:26
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DocScrutinizer05Maxdamantus: never heard of that16:11
DocScrutinizer05usually it's PA that hogs CPU16:11
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DocScrutinizer05Maxdamantus: make sure your ALSA is correctly configured16:12
DocScrutinizer05for dmix the IPC is very important16:13
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jaskaon a desktop where cmus is playing mp3s pa usually takes more cpu than cmus16:14
MaxdamantusWas trying mplayer and mpd.16:15
Maxdamantusmpd was at around 90%16:15
Maxdamantusmplayer about 30%16:15
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Maxdamantuswhat do you have to do WRT IPC?16:25
Maxdamantus        type dmix16:26
Maxdamantus        ipc_key 153216:26
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Maxdamantusyou can just try it in normal Freemantle with mplayer: echo 'pcm.meh { type dmix; ipc_key 1532; pcm.slave "hw:0,0"; }' >>/etc/asound.conf16:28
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Maxdamantusmplayer foo.mp3 -ao alsa:device=meh16:28
Maxdamantususes 30% of CPU for me, and audio is choppy.16:29
Maxdamantuswith the default alsa pulse plug thing, about 9% of CPU in pulseaudio and 5% in mplayer.16:30
Maxdamantus(the 30% in the first one is in mplayer)16:30
MaxdamantusI think the 5% remaining in mplayer is basically just decoding this flac.16:31
bencohflac ? foo.mp3 ?16:35
Maxdamantuswas an example.16:36
* Maxdamantus doesn't actually have a file called foo.mp316:36
bencoh:)16:36
MaxdamantusWell, there's probably a foo.mp3 in /tmp on my main computer, because I don't clear /tmp16:36
Maxdamantusor not.16:36
Maxdamantusfoo.aux foo.c foo.cpp foo.git foo.gitearly foo.hs foo.java foo.log foo.o foo.ogg foo.pdf foo.py foo.tar.gz foo.tex foo.w16:37
Maxdamantusooh, foo.ogg16:37
bencoh:))16:37
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Maxdamantus$ cat foo.w | sed 's/^ */ /' | tr -d \\n; echo foo ::= a @ v:a -| ( b:(a, a) ::= (v, v); return b ); return foo <- 416:39
Maxdamantuser .. foo ::= a @ v:a -| ( b:(a, a) ::= (v, v); return b ); return foo <- 416:39
bencohobviously.16:39
Maxdamantussome language I made a few years ago.16:39
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MaxdamantusHm. Significantly better using aplay/dmix rather than mplayer/dmix16:53
MaxdamantusMaybe it has to do with buffer sizes used or something.16:53
Maxdamantusah, aplay's not causing it to be resampled.16:54
Maxdamantusstill far better than mplayer .. even better than pulseaudio.16:55
Maxdamantus7%16:55
Maxdamantusaplay doesn't work with pulse. Maybe aplay takes shortcuts that mplayer doesn't.16:56
DocScrutinizer05Maxdamantus: hmm, no rate conversion16:58
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MaxdamantusI hadn't specified a pcm.meh.pcm.rate16:59
MaxdamantusI get buffer underflows with aplay/dmix though.17:00
Maxdamantusunderrun*17:01
DocScrutinizer05your pcm.meh doesn't look correct17:02
DocScrutinizer05well, it kinda looks syntactically correct, but it lacks a rate inside dmix, and a rate conversion aka pcm type "plug" before the dmix17:03
MaxdamantusI added a rate next to the slave afterwards.17:04
DocScrutinizer05and I think the hw pcm needs some buffersize etc as well17:04
Maxdamantuswas under the impression dmix already did resampling.17:04
DocScrutinizer05nope, it doesn't17:04
DocScrutinizer05it's even worse since it can only have hw slave17:05
MaxdamantusIt doesn't pick a sensible buffer_size etc by default?17:05
DocScrutinizer05and only works with sample rate of that slave17:05
MaxdamantusSo who's resampling? aplay?17:05
Maxdamantussince my wave file is 44.1 kHz17:05
DocScrutinizer05not necessarily, the application can define a range of preferred buffer sizes etc, and it will pick one from that17:06
DocScrutinizer05I dunno. aplay source is pretty short, and educational17:06
DocScrutinizer05check aplay -vv parameter17:07
DocScrutinizer05it helps a lot for analyzing what's going on in alsa stack17:07
Maxdamantusbuffer_size  : 1536; period_size  : 512; period_time  : 1160917:07
DocScrutinizer05you also see sample rates17:08
DocScrutinizer05of each pcm, in and out17:08
DocScrutinizer05alas not for pukeaudio17:09
DocScrutinizer05obviously17:09
MaxdamantusDirect Stream Mixing PCM: exact rate   : 44100 (44100/1)17:09
DocScrutinizer05o.O17:10
DocScrutinizer05wasn't N900 audiocard fixed to 48k sampelrate?17:10
Maxdamantusafaik, which is why I've been presuming dmix has been resampling.17:10
Maxdamantusor something under the dmix device.17:10
Maxdamantusrather than the application.17:11
DocScrutinizer05obviously nothing does17:11
DocScrutinizer05which might explain why you get lots of buffer underruns17:11
MaxdamantusDoesn't seem to underrun with period and buffer size 1024 and 819217:11
MaxdamantusThey weren't constant before, but it happened every 10s or so.17:12
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Maxdamantusah, setting the rate in also actually halved the CPU usage in mplayer.17:14
Maxdamantusso it looks like mplayer was spending lots of time doing its own resampling (it listed the alsa output as 48 kHz, but played normally)17:15
Maxdamantuswait, that's with 44100 in asound.conf17:18
Maxdamantusnot 4800017:18
Maxdamantusmaybe the hardware does do 4410017:18
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Maxdamantusso mpd is also around 15% like that, which seems acceptable.17:20
* Maxdamantus thinks he might have a few songs in 48 kHz17:21
Maxdamantusoops, was using hw:0,0 in mpd.17:29
Maxdamantusmk, so still at 15% with mpd/dmix, but it can't play 48 kHz songs.17:29
Maxdamantusonly have one in my library, actually.17:29
MaxdamantusRadiohead, Supercollider17:30
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Maxdamantusmplayer can almost downsample it without breaks.17:38
MaxdamantusAUDIO: 48000 Hz, 2 ch, s32le, 1424.2 kbit/46.36% (ratio: 178022->384000)17:38
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MaxdamantusMm, mpd has a cheaper "internal" resampler than the default libsample one.17:46
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Zmr56What the hell is this?23:58
Zmr56Who are you chuckle brothers?23:58
Zmr56And why are there so many people here?23:59
Zmr56Already ab is my favourite guy here23:59
Zmr56You joker!23:59
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