audio810(7D) Devices audio810(7D)
NAME
audio810 - Intel ICH series, nVidia nForce series and AMD 8111 audio core support.
DESCRIPTION
The audio810 driver provides support for AC 97 audio controllers embedded in Intel ICH, nVidia nForce, and AMD 8111 chips.
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 audio810 driver
returns the string SUNW,audio810 in the name field of the audio_device structure. The version field contains a letter "a" and the config
field contains the string onboard1.
Platform Ver. Out H. Phone Spkr. In Mic. CD
Sun W1100z/ W2100z workstation a Y Y Y Y Y Y
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 audio810 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
This driver supports the mixer mode only. (Compat mode is not supported).
Audio Data Formats
The audio810 device supports 16-bit linear encodings in stereo. With the mixer enabled, a continuous range of sample rates from 5510 to
48000 Hz is supported. With the mixer disabled, only sample rate 48000 Hz is supported. This is limited by hardware capability. The device
can be opened for simultaneous play and record whether the mixer is enabled or not.
Sample Granularity
Because the audio810 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 audio810 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/audio810.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
audio810 errors are described in the audio(7I) man page.
FILES
/dev/audio Symbolic link to the system's primary audio device. (Not necessarily an audio810 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 audio810 audio device).
/dev/sound/0ctl Audio control for /dev/sound/0.
/usr/share/audio/samples Audio sample files.
/kernel/drv/audio810.conf audio810 driver configuration file.
ATTRIBUTES
See attributes(5) for a descriptions of the following attributes:
+--------------------+--------------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+--------------------------------------+
|Architecture |PC-based system |
+--------------------+--------------------------------------+
|Availability |SUNWaudd, SUNWauda |
+--------------------+--------------------------------------+
|Stability level |Evolving |
+--------------------+--------------------------------------+
SEE ALSO
mixerctl(1), sdtaudiocontrol(1), ioctl(2), attributes(5), audio(7I), mixer(7I), streamio(7I)
AMD-8111 HyperTransport I/O Hub Data Sheet -- Advanced Micro Devices Inc.
ALC655 Specification -- Realtek Inc.
http://www.sun.com/io
NOTES
Some laptops (including Sony VAIO, among others), have their on-board amplifier powered down by default, meaning that audio is suppressed
even if hardware and the audio810 driver are working normally. To correct this, set the ac97-invert-amp=1 property in the /ker-
nel/drv/audio810.conf to power-up the amplifier.
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 audio810.conf is set too low. It has been reset to the rate specified in the message. Update audio810.conf
to a higher play interrupt rate.
init_state() play interrupt rate set too high
The play interrupt rate set in audio810.conf is set too high. It has been reset to the rate specified in the message. Update
audio810.conf to a lower play interrupt rate.
init_state() record interrupt rate set too low
The record interrupt rate in audio810.conf is set too low. It has been reset to the rate specified in the message. Update audio810.conf
to a higher record interrupt rate.
init_state() record interrupt rate set too high
The record interrupt rate in audio810.conf is set too high. It has been reset to the rate specified in the message. Update
audio810.conf to a lower record interrupt rate.
SunOS 5.11 20 Nov 2006 audio810(7D)