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IRIX Installation Tools & Overlays 2004 February
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SGI IRIX Installation Tools & Overlays 2004 February - Disc 2.iso
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2004-01-09
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4. _A_u_d_i_o__C_o_n_t_r_o_l__P_a_n_e_l
Audio Control Panel (invoked from the command line as
_a_u_d_i_o_p_a_n_e_l(1)) provides a graphical user interface and
command line interface for controlling and monitoring audio
I/O device parameters.
4.1 _C_h_a_n_g_e_s__a_n_d__A_d_d_i_t_i_o_n_s
This section lists changes/additions to the Audio Control
Panel between the IRIX 6.2 and IRIX 6.4 releases.
IRIX 6.4 continues use of the new, generalized version of
the Audio Control Panel first included with IRIX 6.2, which
has been designed to accommodate multiple audio I/O devices
installed in the same system:
+o With the new requirement of having to manage multiple
input and output devices, audiopanel's menu bar
structure changed. Previously, the Input and Rate had
their own top-level menus. Now, before adjusting the
input source or sample rate for a particular device,
the device must first be selected by clicking the right
mouse button over a device panel. After the selection
is made, the Selected menu contains submenus for
modifying Input Source and Sample Rate. Availability
of these submenus and/or entries on these submenus will
vary depending on which device is currently selected.
+o The Options menu selection for Input (or Output)
Sliders Independent has now moved to the Selected menu
under the toggle entry Group Sliders. Audiopanel keeps
track of the slider grouping status for each device
independently.
+o For Indigo2 and Indy machines, the toggling of four-
channel mode and stereo microphone as previously done
in the Options menu. These functions have been moved
to the Device Preferences Dialog for the AnalogIn
device, This dialog can be reached by first selecting
the AnalogIn device, then by choosing the
Preferences... option in the Selected top-level menu.
+o Previous incarnations of audiopanel had a choice of a
Digital Input in the Input source menu for Indy,
Indigo2 and the Onyx Audio/Serial Option. Under the
new audio architecture, the input source Digital Input
is now handled as its own device, called Digital In ,
which is independent of the Analog In device. Setting
- 2 -
the default input to the Digital In device on these
machines will provide the same functionality as
switching the previous audiopanel's input source to
Digital In.
+o Previous incarnations of audiopanel had a Use Input
Rate option as part of the output sample rate menu.
Unfortunately, this convenience feature is not
available in this newer version of audiopanel.
+o Previous incarnations of audiopanel had a Digital Input
choice for output sample rates device by setting its
sync source to AES In and matching its sample rate to
the Digital In (or AES In ) device on the same audio
subsystem.
+o It should be noted that digital output devices have no
sliders to control gain and no signal meters, because
gain control and signal monitoring on these devices is
unsupported. A blank looking control panel for a
digital output device is completely normal. Sample
rates and input sources are still modifyable as they
are appropriate for the device.
+o Audio controls for the Presenter Flat Panel display are
no longer relegated to a separate window. Presenter
Controls will now appear alongside those of the
appropriate baseline Analog Out device on the system.
+o Normally, all outputs interfaces for a particular audio
output device are active. If an output device supports
the choice of directing output to a single output
interface, the device's popup menu and Selected menu
will have an additional Output Destination Menu, akin
to the Input Source, allowing the user to select which
output is to be active.
4.2 _B_u_g__F_i_x_e_s
+o BUG 458608 - The apanel Selected->Make Default menu
would give all the user interface indications that the
Default Device was changed, however, with the insidious
little side effect of not actually telling the audio
system to change the Default Device.
+o BUG 469264 - Apanel's Device List panel would not
always be able to accommodate long device names,
especially those with subsystem names prepended. The
Device List now is sized accordingly.
- 3 -
+o BUG 437617 - Apanel's command line would not accept
fully qualified or typed names of audio resources (such
as "RAD1.AES In" or "A3.Microphone", etc.). The command
line can now handle the much more robust references
that alGetResourceByName() provides.
+o BUG 415586 - Subsystem names now appear on sync sources
when its appropriate to distinguish between similarly
named, but distinct time bases.
+o BUG 423362 - Apanel would not recognize user-interface
oriented command-line and resource file settings
specified for default devices. Examples were -meteron
-meteroff and resources effecting filter operations of
the meters.
+o BUG 475753 - Apanel meters on digital devices no longer
use a DC filter by default. Analog devices, however,
still use a DC filter by default.
+o BUG 483191 - With DC filtering off, apanel's right
meter would not always display correct information
(only when the device was a stereo device).
+o BUG 481235 - Apanel's File->Revert menu would not turn
the audio system back to its factory settings as
indicated in the help. Now it does.
4.3 _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
+o The minimum input slider position does not correspond
to infinite attenuation on Indy and Indigo2. This is
an audio hardware limitation.
. The In-Use indicator on the title bar for each device
is known to not switch on or off correctly when the
Default Output is changed. Restarting audiopanel has
been known to clear up the problem.
+o Presenter gain controls are operable only when the
device's sliders are ungrouped. Tone controls currently
don't work just yet.
+o If a data file is opened for recovering audiopanel
layout and system state that is invalid, the device
panels currently in view will disappear. They can be
restored by re-selecting them through the View pane.