CHAPTER 3

Audio Test (audio)

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The audio test verifies the hardware and software components of the audio subsystem. This test supports all Sun audio implementations.

The audio device is an exclusive use device. Only one process or application can interface with it at a time. This test is not scalable.

The availability of the following subtests depends on the particular audio implementation being tested.

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audio Subtests

TABLE 3-1 audio

Subtest	Description
Record/Play Test	This test plays and records one second of data. It does not check data. This test is run on all audio implementations.
Crystal Test	The crystal test measures the accuracy of the crystal that generates the sample rate clock. It does this by playing a one-second signal and then measuring the actual time required to play the signal. This measurement is performed for each of the eight standard sample rates. This test is available for dbri(7) and audiocs(7) audio implementations
Loopback Tests	This test verifies the functionality and signal quality of the audio ports. The test simultaneously plays and records a known signal. The recorded signal is analyzed for loop gain and signal-to-noise ratio plus distortion. This is repeated at various sample rates, encodings, precisions and channels. The audio ports that are supported depend on the audio implementation under test. The audiocs(7) implementation supports loopbacks from/to headphone, line-out, microphone, and line-in ports. The dbri(7)/speakerbox implementation supports fewer ports. The audioamd(7)implementation does not support loopback tests. Most tests require a stereo loopback cable. NOTE: The microphone loopback tests require special hardware and are used by manufacturing centers and special test facilities. Do not invoke the microphone loopback tests unless you have the required hardware.
Controls Test	This test verifies the three control buttons on the Sun Speakerbox. The Controls test plays music while the user is prompted to press the Volume Down, Volume Up, and Mute buttons in a specific order. If no button is pressed, the music plays for about 30 seconds, then stops, and returns an error. This test is only supported on the dbri(7)/speakerbox implementation.
Audio Test	This test plays a 30-second music file out of the speaker or headphone. The user must decide if the test passes or fails. Badly distorted audio, or no audible music indicates a problem. This test is supported on all audio implementations.

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audio Options

Upon start-up, the SunVTS probe utility determines which audio implementation is present and adjusts the audio option menu appropriately. The possible option menus are as follows:

FIGURE 3-1 audioaudioamd(7)

The audioamd(7) is an 8-bit mono, telephone-quality, audio device.

FIGURE 3-2 audiodbri(7) audio

The speakerbox dbri is a high-quality 16-bit stereo multimedia (coder/decoder (codec).

FIGURE 3-3 audio dbri(7

without a Speakerbox attached

The on-board DBRI interface is a high-quality, 16-bit stereo multimedia codec.

FIGURE 3-4 audiodbri(7)

and S240

The SPARCstation 20 On-board dbri is a high-quality 16-bit stereo multimedia codec.

FIGURE 3-5 audioaudiocs(7)

The audiocs(7)is an on-board, high-quality 16-bit stereo multimedia codec.

FIGURE 3-6 audioaudiocs

The audiocs(7) is an on-board, high-quality 16-bit stereo multimedia codec.

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Note - The internal loopbacks are only active if the audio jacks are unused (nothing connected).

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Some options can only be selected through the command line. See the command line option descriptions in "audio Command Line Syntax" on page 42.

TABLE 3-2 audio

Option	Description
Audio Test	Enables or disables the music play test. This test is enabled by default.
Audio Output	Selects the output port for the music play test.
Volume	Sets the volume for the music play test.

TABLE 3-2 audio(Continued)

Option	Description
Loopback Test	Enables or disables the loopback test. A loopback cable must be installed between the selected ports to run this test. This test is disabled by default.
Loopback type	Selects the type of loopback test to run.
Crystal Test	Enables or disables the crystal test. This test is disabled by default.
Controls Test	Enables or disables the speakerbox Controls test. This is an interactive test and the user is prompted to press the control buttons on the speakerbox. This test is disabled by default.

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Note - Do not run the crystal test while running other SunVTS tests. The crystal test is timing-dependent. If the system is too busy, it fails due to time-out errors.

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audio Test Modes

TABLE 3-3 audio

Test Mode	Description
Connection Test	A simple open and close is performed. No data is transferred. The test returns a pass if the device can be opened and closed successfully. If the device cannot be opened because it is busy, then it is assumed that the device is successfully connected to another process and the test passes.
Functional Test	The record/play test is run and you can choose to run any of the tests described earlier. In this mode, the test will fail if the device is busy. If you invoke SunVTS through SyMON, the following Functional Test description applies: The record/play test is run. If the device cannot be opened because it is busy, then it is assumed that the device is successfully connected to another process and the test passes.

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audio Command Line Syntax

/opt/SUNWvts/bin/audio standard_arguments -o dev=/dev/sound/
unit_no,I=/dev ioctl_device, M, L, Q, S,
T=loopback_test_type,X,E,LE,CD,CDD=CD_device_name,
CDT=track_number,CDG=play_gain,CDL=play_time,W,
MF=filename,TF=filename

TABLE 3-4 audio

Argument	Explanation
dev=/dev/ audio_device	Specifies the audio device to be tested. The default is dev=/ dev/audio
I=/dev/ioctl_device	Specifies the audio ioctl device to be tested; the default is /dev/audioctl.
M	Enables the music play test.
L	Enables the loopback test.
Q	Enables the quality test. This option does the same thing as L option except that it prints an extra status message upon completion.
S	Enables the speakerbox controls test.
T=loopback_test_type	Specifies the type of loopback test. The default is 1; the choices are listed below. 0 Speaker/Microphone 1 Line-in/Line-out 2 Headphone/Line-in 3 Headphone/Microphone 4 Speaker/CD-input I1 Internal Line-in/Line-out I2 Internal Spk/Mic I3 Internal Headphone/Aux1 Note: Test types 0, 3, an 4 require special hardware, and are used by manufacturing centers and special test facilities. Do not invoke these tests unless you have the required hardware.
X	Enables the Audio Crystal test.
E	Continues testing if an error occurs.
LE	Loops on Error. This plays the signal data in a continuous loop.

TABLE 3-4 audio(Continued)

Argument	Explanation (Continued)
CD	Enables the cdtest. This is for systems with an internal CD-ROM drive. A CD disc with music tracks must be loaded prior to running this test.
CDD=CD_device_name	Specifies the raw device name for the CD-ROM drive. The default is CDD=/dev/rdsk/c0t6d0s0.
CDT=number	Specifies the track number of CD-ROM to play. The default is to play the first track on the disc.
CDG=play_gain	Specifies the play gain of the CD Play test (0 to 255). The default is 120.
CDL=play_time	Specifies the number of seconds to run the CD Play test. The default is 30 seconds.
W	Shows warning messages during the loopback test.
MF=filename	Selects an optional music file.
TF=filename	Specifies an optional tolerance file. Note: The tolerance file is used by manufacturing centers and special test facilities. Do not use this option unless you are familiar with the tolerance file format.

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audio Error Messages

TABLE 3-5 audio

	Error Message	Probable Cause(s)	Suggested Action (if applicable)
6000	Signal To Noise ratio too low (name) on name, SNR =number db, Min SNR =number db (text)	Loopback cable is missing or faulty. Audio hardware (usually consistent failures). System software problem (usually intermittent failures).
6001	Channel Separation too low (name), SEP =number db, Min SEP =number db (text)	Loopback cable is faulty. Audio hardware is faulty (usually consistent failures). System software problem (usually intermittent failures).

TABLE 3-5 audio(Continued)

	Error Message	Probable Cause(s)	Suggested Action (if applicable)
6002	Loop gain is out of range (name), name GAIN =number db, Min =number Max =number db (text)	Loopback cable is missing or faulty. Audio hardware is faulty (usually consistent failures). System software problem (usually intermittent failures).
8000	Must be super user (root) to execute	The user does not have root privileges.
8012	Invalid audio device (device_name) for Crystal test	The crystal test is not supported on the system audio device.
8013	Invalid audio device (device_name) for Controls test	The system audio device does not support a speakerbox.
8014	Invalid audio device (device_name) for Loopback Quality test	No loopback tests are supported on the system audio device.
8015	Invalid audio device (device_name) for Loopback Quality test (T=number)	The specified loopback test is not supported on the system audio device. The specified loopback type is not supported on this audio device.

8020	Incomplete button press sequence	The required button presses were not detected in the time allowed.
8023	Underrun/Overrun error failure	The audio driver detected underrun or overrun errors while transferring data to the audio device. These errors usually happen when the loopback test is run while during heavy system activity.
8027	name: 'name(name=number,	The system call is hanging.
	name=number, name=number)' system call timeout. No response after number seconds. Device =	Audio hardware (usually consistent failures).
	device_name	System software problem (usually intermittent failures).

TABLE 3-5 audio(Continued)

	Error Message	Probable Cause(s)	Suggested Action (if applicable)
8028	Audio crystal test did not complete in the expected time, rate = number Hz, time = number usecs, min = number, max = number	Excessive loading on the system.	Disable all other tests and try again.
8029	Speaker is an invalid output port for device	The system does not have an on-board speaker.
8032	Failed ioctl name (error_message)	The ioctl( ) system call failed.	See the appended error message.
8033	Failed mmap (error_message)	The mmap( ) system call failed.	See the appended error message.
8034	Failed fstat (error_message)	The fstat( ) system call failed.	See the appended error message.
8035	Failed ftruncate (error_message)	The ftruncate( ) system call failed.	See the appended error message.
8036	Write to audio device returned error condition (error_message)	The write( ) system call failed.	See the appended error message.
8037	Read from audio device returned error condition (error_message)	The read( ) system call failed.	See the appended error message.
8038	Failed to allocate number bytes of memory (error_message)	The memory allocation system call failed, most likely due to a lack of system memory resource.	See the appended error message.
8051	Unknown audio device (name=device_name, config=name)
8052	Unable to get platform name
8053	Unknown architecture/audio = name / device_name
8055	Could not open device_name: error_message	The open( ) system call failed Examine system message files (/ var/adm/messages) for other information. Device does not respond. No mmcodec device found. Unable to communicate with speakerbox.

TABLE 3-5 audio(Continued)

	Error Message	Probable Cause(s)	Suggested Action (if applicable)
8075	Invalid audio file format	Specified audio file is not in expected format.
8077	Invalid audio encoding	An unknown audio encoding type was specified.
8090	Only one name loopback can be selected at a time	The user specified more than one loopback test on the same port.
8091	Cannot enable loopback testing without selecting a loopback type	The user enabled loopback testing but did not specify a loopback type.