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| 19:30.29 | Pali | Hello, do you know if n900 supports line-in audio? And if it can be configured in Maemo? |
| 19:41.37 | Pali | DocScrutinizer05: any idea? |
| 19:56.02 | sicelo | Pali: out of the box, no. |
| 19:58.43 | sicelo | if any of you somehow manage to implement it, i'm more than willing to be a tester. using old Nokia N-Gage for line-in needs on the go |
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| 20:06.28 | pkill9 | is that line-in through the headphone port? |
| 20:16.46 | sicelo | n-gage? yes. (actually n-gage and 5510(?) have two ports. one for headphone, and another for headset. the headphone port is also line-in, and records in AAC) |
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| 20:20.07 | pkill9 | hi Pali, i use your kernel for now |
| 20:20.53 | Maxdamantus | Presumably you could just wire something the right way to a TRRS plug to work as a "line in" adapter/cable/something |
| 20:21.34 | Maxdamantus | Though I'm guessing the question is about using a tip and single ring as the left/right. |
| 20:21.47 | sicelo | don't you need some internal circuitry though? with an ADC or something |
| 20:23.06 | Maxdamantus | I wouldn't imagine so .. I would imagine headsets would just have a normal analogue microphone, though I don't really know much about headsets. |
| 20:26.41 | Maxdamantus | I guess one main pitfall to just wiring it differently would be that you still wouldn't get two channels, since if it is just analogue as I'd've guessed, you'd only have one channel on the extra ring. |
| 20:27.14 | Maxdamantus | (or sleeve,depending on which it uses) |
| 20:27.46 | sicelo | i seem to doubt that's what he meant |
| 20:29.16 | sicelo | i could be wrong, but i think he meant the same "line-in" you get on a sound card, as opposed to "mic-in" |
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| 20:32.42 | Pali | yes |
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| 20:36.25 | sicelo | i guess first stop is schematics - is there a chip supporting audio in? (i doubt) |
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| 21:20.46 | Maxdamantus | Hm, apparently line-in usually has higher impedence than a microphone input. |
| 21:21.15 | Maxdamantus | other than that, and potentially some difference between mono/stereo .. would they really be any different in hardware? |
| 21:21.34 | KotCzarny | yes |
| 21:21.46 | KotCzarny | different voltage levels and other characteristics |
| 21:29.39 | DocScrutinizer05 | Pali: N900 has no line-in |
| 21:30.31 | DocScrutinizer05 | hw-limitation |
| 21:31.17 | DocScrutinizer05 | Pali: only microphone mono audio-in |
| 21:31.27 | Pali | ok |
| 21:32.01 | DocScrutinizer05 | Neo900 has stereo line-in |
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| 21:46.13 | ff_ | alsamixer -c0 shows DAC_L1 R1, DAC_L2 R2 and DAC_L3 R3. What's a difference between them? |
| 21:46.59 | ff_ | I can hear some diff with harmonic / equalizer / pan between L1 and L3. L3 is a little bit pleasant. |
| 21:49.17 | ff_ | Can N900 records audio from built in mic to left ch and from headset mic to right ch? |
| 21:54.05 | DocScrutinizer05 | good question. Should work |
| 21:55.32 | ff_ | only DAC L1 and L3 works, is it two different Digital Analog Converter or it's some kind of separate interial lines with the same DAC? |
| 21:56.43 | DocScrutinizer05 | ask the ALSA coders, they are notorious to not provide correct schematics-matching names for their controls |
| 21:57.06 | ff_ | I was trying this semi stereo record with gstreamer (two stream to one file) but dunno how to operate with left / right ch |
| 21:57.52 | DocScrutinizer05 | and digging through all sourcecode to find out which alsa control is linked to which hardware audio lines is tedious at best |
| 21:58.28 | KotCzarny | if it was pure alsa, you could create virtual audio device with hybrid configs |
| 21:58.41 | KotCzarny | but this is n900 owned by evilaudio, so who knows |
| 21:59.04 | ff_ | ok, it just curious, probably not worth of work |
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| 22:06.51 | ff_ | Can alsa virtual audio device mix two stream (from build mic and headset mic) accordingly into left / right ch potentially? |
| 22:07.00 | KotCzarny | yes |
| 22:07.04 | KotCzarny | that's what i wrote |
| 22:07.32 | KotCzarny | but i also wrote that it would require messing with evilaudio, which is not a good idea on n900 |
| 22:11.00 | ff_ | it's new to me, thx for hint |
| 22:15.58 | DocScrutinizer05 | ff_: check ALSA data |
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| 22:20.05 | DocScrutinizer05 | http://www.alsa-project.org/main/index.php/Main_Page http://www.alsa-project.org/~jfulmer/alsa-faq.html https://alsa.opensrc.org/Dsnoop |
| 22:21.52 | DocScrutinizer05 | https://alsa.opensrc.org/PCM_device |
| 22:22.28 | DocScrutinizer05 | https://alsa.opensrc.org/Alsa-lib |
| 22:49.28 | ff_ | powered OTG works, it's unstable here, works around 5min and 'disconnect' but dmesg doesn't show disconnect keyboard |
| 22:52.46 | ff_ | maybe keyboard is a crap |
| 22:54.43 | ff_ | alsa virt dev need some time, go to sleep |
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