audiots(7D) Devices audiots(7D)
NAME
audiots - 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.
APPLICATION PROGRAM INTERFACE
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, headphone, 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 u-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 recording 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.
ERRORS
audiots errors are described in the audio(7I) man page.
FILES
/dev/audio Symbolic link to the system's primary audio device. (Not necessarily 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 necessarily 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 ALSO
mixerctl(1), sdtaudiocontrol(1), ioctl(2), attributes(5), audio(7I), mixer(7I), streamio(7I)
Acer Laboratories Inc. M5451 PCI Audio Processor Technical Specification
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 settoo 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)