User:ClemensLadisch

CMI8788 driver status

2007-11-12

Rewritten from scratch.

The second-most important feature, the MIDI port, now works. (The most important feature, the colorful jack illumination on my Xonar card, is not controlled by software and has always worked.)
:-)

should work:

• analog playback
  • at 32, 44.1, 48, 64, 88.2, 96, 176.4, 192 kHz
  • 16 or 24 bits
  • 2, 4, 6, 8 channels
  • volume controls for all eight channels
  • upmixing of stereo to rear and side channels
• digital playback of PCM data (AC-3 not yet implemented)

currently untested:

• analog playback on cards with AK4396 DACs (i.e., any card except Xonar)
• analog recording
• digital recording

not yet implemented:

• front panel output
• mixer controls for analog recording
• controls for controlling SPDIF ports

known problems:

• some garbage at the beginning of recorded data → ADC needs more time to settle after clock switch

my TODO list

1. CMI8788 driver
   ca. 88.2%
2. use hrtimers in the MIDI sequencer
   ca. 25%
3. usb-audio: allow shorter-than-1ms periods for high-speed devices (just remove the code that rounds periods to USB frames)
   0%
4. usb-audio: handle MIDI write errors better
5. move non-public headers out of linux/include/sound/
6. PCI: annotate in-memory data structures read by bus master chips with __le/be
7. implement (some?) OSS 4 API ioctls
8. test (i.e., use) alsa-python
9. use dev_printk?
10. various subsystem send different and too many MIDI reset commands when a port is closed
11. usb-audio: restructure
12. OSS emulation by redirecting to user space (like FUSE, but we need ioctls and mmap)
13. MIDI synth: support more sysex commands
14. MIDI synth: MIDI tuning
15. ymfpci: MIDI synth