- Revert temporary usage of sc_[pr]busy during suspend. These indicate
whether the mixer needs to be restarted or not.
- Avoid timeout error when about to suspend.
If the port has __AUDIO_BLK_MS in <machine/param.h>, it will be used.
Otherwise the default value (currently 10 msec) defined in audio.c will
be used. This mechanism is for very old ports which cannot satisfactorily
handle 10 msec block. Currently hppa, m68k, sh3, sparc(!64) and vax are.
For port maintainers, if general models in your port cannot satisfactorily
handle 10 msec block, please consider to define your suitable longer period
(40 msec would be a good first choice).
But please don't be eager to make the default value shorter.
<machine/param.h> was discussed in source-changes-d. It's better than
ifdef storm, or adding 60+ new header files in every arch/*/include/
directories for this. Thanks mrg@, ad@, and everyone.
http://mail-index.netbsd.org/source-changes-d/2020/05/01/msg012572.html
(m68k uses 40msec default as before). And remove the option from GENERIC.
- It's not good idea to set such parameter in individual GENERICs.
- 4msec is (probably no problem for most modern real hardware but)
too aggressive to be default.
- 10msec is too severe for antique machines but it's hard to draw a line.
called (unless pause).
- Opening /dev/audio always initializes pause with false. Therefore
it always starts recording.
- Opening /dev/sound inherites pause from the sticky parameter.
Therefore whether /dev/sound starts recording or not depends on the
sticky pause parameter.
This fixes two problems:
- Opening /dev/audio didn't start recording after merging isaki-audio2.
- Opening /dev/sound didn't start recording regardless of the sticky
pause, probably since long time ago (at least netbsd-7).
This did not do what I thought it did. opt_diagnostic.h is only for
the unused _DIAGNOSTIC, which seems like an abortive attempt to
incrementally convert DIAGNOSTIC to an opt_*.h option rather than a
command-line option.
For sticky parameters (encoding, precision, channels, sample_rate and pause):
- AUDIO_SETINFO for nonexistent track updates sticky parameters.
- AUDIO_GETINFO for nonexistent track reads sticky parameters.
For blocksize, hiwat, lowat and {play.record}.buffer_size:
- AUDIO_SETINFO for nonexistent track does nothing.
- AUDIO_GETINFO for nonexistent track returns dummy non-zero values.
Nonexistent track is a playback track on O_RDONLY descriptor for example,
or both tracks on /dev/audioctl.
When the number of the hardware channels becomes less than the number of
channels that sticky parameters remember, subsequent open("/dev/sound") will
fail without this treatment. This is for rev 1.43.
to the number of channels supported by the hardware or less, if the hardware
supports multi channels.
- On monaural or stereo hardware, userland apps can always set 1ch or 2ch.
The kernel (audio layer) can convert mono-stereo each other.
- On 3ch (2.1ch) hardware, for example, userland apps can set 1, 2, or 3ch,
but not 4ch or more.
This allows userland apps to know actual number of channels supported by
the hardware in the same way as before.
PR kern/54973.
- It makes FIOASYNC code in mixer_ioctl() symmetric.
- For readability, mixer_async_{add,remove}() should take pid argument
though pid is always curproc.
audioclose() freed audio_file_t structure, but only audiobellclose
didn't pass there. I change that all of freeing audio_file_t is done
by each *_close().
