* sync(), because it waits for hardware buffers to flush, which
can take several seconds depending on cirumstances (according
to the OSS docs)
* close(), because it does an implicit sync()
it instead of the OS-specific <linux/soundcard.h> or <machine/soundcard.h>.
Mixers devices have an ioctl-only interface, no read/write -- so the
flags passed to open() don't really matter. Thus, drop the 'mode'
parameter to openmixer() (ie. second arg to newossmixerobject()) and
always open mixers with O_RDWR.
devices(), stereodevices(), recdevices() ->
controls(), stereocontrols(), reccontrols()
Based on recommendation of Hannu Savolainen <hannu@opensound.com>:
The right term to use for things like bass/treble/mic/vol/etc is
"control".
"Device" refers to different mixer devices (/dev/mixer0 to /dev/mixerN).
"Channel" cannot be used because it refers to mono/stereo/multich
channels. In fact most mixer controls have left/right channels so ...
* channels() -> devices()
* stereochannels() -> stereodevices()
* recchannels() -> recdevices()
* getvol() -> get()
* setvol() -> set()
This is for (slightly) more consistency with the OSS ioctl names
(READ_DEVMASK, READ_RECMASK, READ_STEREODEVS).
Also make sure the C function names correspond more closely to the
Python method names for mixer methods.
* rename oss_t to lad_t, Ladtype to OSSType,
* rename lad_*() methods to oss_*()
* rename lad_methods list to oss_methods
Patch and impetus supplied by Nicholas FitzRoy-Dale <wzdd@lardcave.net>.
Use OSSAudioError much less frequently -- all real I/O errors (ie. any
time open(), read(), write(), ioctl(), or select() return an error)
become IOError. OSSAudioError is only used now for bad open() mode.
Added _EXPORT_INT macro to export an integer constant to Python-space.
Use it for all the AFMT_* constants, and update the list of AFMT_*
constants to match what's in Linux 2.4: add AFMT_{QUERY,IMA_ADPCM,
MPEG,AC3}. This should probably be tested with older versions of OSS,
eg. with Linux 2.2 and 2.0.
Export all SNDCTL_* ioctl numbers (where "all" is the set found in
/usr/include/linux/soundcard.h on my Debian 3.0 system -- again
Linux 2.4). Again needs to be tested with older OSS versions.
it impossible to access blocking mode!
* Rename write() to writeall(), and add a write() method that just
does one write().
* Rearrange/simplify writeall(): in particular, don't supply a timeout
to select(). Let it block forever if it has to.
* Add a bunch of simple ioctl() wrappers: nonblock(), setfmt(),
getfmts(), channels(), speed(), sync(), reset(), post(). These
wrap, respectively, SNDCTL_DSP_NONBLOCK, SNDCTL_DSP_SETFMT,
SNDCTL_DSP_GETFMTS, etc.
* Reduce flush() (which was a wrapper for the SNDCTL_DSP_SYNC ioctl) to
an alias for sync().
* Rearrange the lad_methods list to reflect the order in which the
methods are defined, and add some grouping comments.
This module is a replacement for linuxaudiodev, which will eventually
be deprecated.
Initial revision is rev 2.20 of linuxaudiodev.c, with a rewritten
header comment.
Greg Ward
Andrew M. Kuchling
Neal Norwitz