audiots(7D) Devices audiots(7D)NAMEaudiots - Acer Laboratories Inc. M5451 audio processor interface
DESCRIPTION
The audiots device uses the ALI M5451 audio processor and an AC-97
Codec to implement the audio device interface.
API
This interface is described in the mixer(7I) and audio(7I) man pages.
Driver Versions
Applications that open /dev/audio may use the AUDIO_GETDEV ioctl(2) to
determine which audio device is being used. The audiots driver will
return the string SUNW,audiots in the name field of the audio_device
structure. The version field will contain a letter (defined in the ta‐
ble below) and the config field will contain the string onboard1.
Platform Ver. Out H. Phone Spkr. In Mic. CD
Sun Blade 100 a Y Y Y Y Y N
Key to the above table: Ver. = Version. Out = Line Out. H. Phone = Head
Phone. Spkr = Internal Speaker. In = Line In. Mic. = Microphone. CD =
CD=ROM
The audiots device provides support for the internal speaker, head‐
phone, line out, line in, and microphone. The play.mod_ports and
record.mod_ports fields of the audio_info structure (see audio(7I))
indicate which ports may be manipulated.
Audio Mixer Mode
The configuration file /kernel/drv/audiots.conf is used to configure
the audiots driver so that the audio mixer is enabled or disabled. See
the mixer(7I) manual page for details. The audio mixer mode may be
changed at any time using the sdtaudiocontrol(1) or mixerctl(1) com‐
mands.
Audio Data Formats
The audiots device supports 8-bit μ-law and A-law, 8-bit linear and
16-bit linear encodings in mono and stereo. With the mixer enabled, a
continuous range of sample rates from 5510 to 48000 Hz is supported.
With the mixer disabled, the following sample rates are supported:
5510, 6620, 8000, 9600, 11025, 16000, 18900, 22050, 27420, 32000,
33075, 37800, 4410, and 48000 Hz. When the audio mixer is disabled and
the device is opened for simultaneous play and record, the input and
out data formats may be different.
Sample Granularity
Because the audiots device manipulates buffers of audio data, the
reported input and output sample counts will vary at any given time
from the actual sample count by no more than the size of the buffers
the audiots driver is transferring. In general, programs should not
rely on the absolute accuracy of the play.samples and record.samples
fields of the audio_info structure.
Interrupt Rate
The driver determines how often play and record interrupts should take
place. For playing audio, this determines how often and how much audio
is requested from the audio mixer. The impact of interrupts on record‐
ing is minimal. However, if a very small read buffer size is set, the
record interrupt rate should be increased to prevent the buffer from
overflowing. The play and record interrupt rates are tunable in the
/kernel/drv/audiots.conf file.
Audio Status Change Notification
As described in the audio(7I) and mixer(7I) man pages, it is possible
to request asynchronous notification of changes in the state of an
audio device.
ERRORSaudiots errors are described in the audio(7I) man page.
FILES
/dev/audio Symbolic link to the system's
primary audio device. (Not nec‐
essarily an audiots audio
device).
/dev/audioctl Control device for the primary
audio device.
/dev/sound/0 Represents the first audio
device on the system. (Not nec‐
essarily an audiots audio
device).
/dev/sound/0ctl Audio control for /dev/sound/0.
/usr/share/audio/samples Audio sample files.
/kernel/drv/sparcv9/audiots 64-bit audiots driver
/kernel/drv/audiots.conf audiots driver configuration
file.
ATTRIBUTES
See attributes(5) for a descriptions of the following attributes:
┌────────────────────┬──────────────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼──────────────────────────────────────┤
│Architecture │SPARC │
├────────────────────┼──────────────────────────────────────┤
│Availability │SUNWaudd, SUNWauddx, SUNWauda │
├────────────────────┼──────────────────────────────────────┤
│Stability level │Evolving │
└────────────────────┴──────────────────────────────────────┘
SEE ALSOmixerctl(1), sdtaudiocontrol(1), ioctl(2), attributes(5), audio(7I),
mixer(7I), streamio(7I)
Acer Laboratories Inc. M5451 PCI Audio Processor Technical Specifica‐
tion
http://www.sun.com/io
DIAGNOSTICS
In addition to being logged, the following messages may appear on the
system console:
init_state() play interrupt rate set too low
The play interrupt rate in audiots.conf is set too low. It has been
reset to the rate specified in the message. Update audiots.conf to
a higher play interrupt rate.
init_state() play interrupt rate set too high
The play interrupt rate set in audiots.conf is set too high. It has
been reset to the rate specified in the message. Update
audiots.conf to a lower play interrupt rate.
init_state() record interrupt rate set too low
The record interrupt rate in audiots.conf is set too low. It has
been reset to the rate specified in the message. Update
audiots.conf to a higher record interrupt rate.
init_state() record interrupt rate set too high
The record interrupt rate in audiots.conf is set too high. It has
been reset to the rate specified in the message. Update
audiots.conf to a lower record interrupt rate.
SunOS 5.10 23 Aug 2002 audiots(7D)
