Archive for June, 2006

New ioctls outlined, roughly prioritized

Tuesday, June 6th, 2006

Finished cataloging what appears to be the bulk of useful ioctls supported by the OSS v4 API. Notable exceptions are the MIDI and mixer extensions. For now, MIDI is at a lower priority, and the mixer extension specifications seem to be in flux. (I’ll need to ask 4Front about that.) Check out the results here.

Based on that list and input from Alexander, I’ll attack ioctls in roughly this order:

Muy importante:

  • SNDCTL_{SYS,AUDIO}INFO

  • SNDCTL_DSP_{GET,SET}_{PLAYTGT,RECSRC}_NAMES

  • SNDCTL_DSP_{GET,SET}{REC,PLAY}VOL

Next up, in random order:

  • SNDCTL_DSP_COOKEDMODE

  • SNDCTL_DSP_CURRENT_[IO]PTR

  • SNDCTL_DSP_GET[IO]PEAKS

  • SNDCTL_DSP_HALT_{IN,OUT}PUT

  • SNDCTL_DSP_LOW_WATER

  • SNDCTL_DSP_SILENCE, SNDCTL_DSP_SKIP

Thoughts?

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Gah.

Saturday, June 3rd, 2006

Quick update:  A bit behind at the moment.  Catalogued all of the existing ioctls in pcm/{dsp,mixer}.c and midi/sequencer.c to get a sort of “big picture” grasp of current code.  Next, need to go over everything at OSS and start writeups on all the new stuff.

Further down the road, after the API is in place at least in name, I’ll need to start testing/tweaking soundcard drivers.  I have access to an ICH and an EMU10K1, so I can test/tweak with those, but will probably need to defer on all others.  I’ve been using Yuriy Tsibizov’s emu10kx driver for some time now, and am pleased to read that it’s coming to the base system.  I’m wondering if it’ll sit next to the existing emu10k1 driver or just replace it completely.

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