7(August 31, 2006)

NAME
osscore - Open Sound Sytem core audio framework.

DESCRIPTION
Open Sound System core audio support psudo driver. This driver implements the core Open Sound System API for audio, midi, mixer and synth functions. This driver also implements the OS driver interface as well as device configuration and setup. More information on programming on the OSS API is avaialable at: http://manuals.opensound.com/

OPTIONS

•
    ac97_recselect    When set to 1 this option enables independent
            recording source selection for the left and the right channel
            on AC97 devices. In this way it's possible to record audio
            streams so that (for example) the left channel signal comes
            from the microphone and
            the right channel signal from line-in. However when this
            option is enabled it's only possible to select the recording
            source by using a fully OSS 4.0 compatible mixer program such
            as ossxmix.
            Default: 0 - recording source is common to both channels.

•
    ac97_amplifier    When set to 1 this option enables the speaker power
            amplifier feature of AC97 codec (if available).
            Some boards have this inverted, so this feature can be
            disabled by setting this option to 0.
            Affects all AC97 based audio devices in the system.
            Default: -1=autodetect correct setting.

•
    cooked_enable    By default OSS will let applications to use sampling
            rates and formats that are not supported by the hardware.
            Instead OSS performs the necessary format conversions in
            software. Applications that don't tolerate this kind of
            conversions usually disable them by using features of the OSS
            API (SNDCTL_DSP_COOKEDMODE). If this option is set to 0 then
            the format conversions will be disabled for all applications
            and devices unless the application explicitly enables them.
            Default: 1 - conversions are enabled.
            This option should not be changed without very strong reasons.

•
    detect_trace     Internal debugging (do not change). Default: 0

•
    dma_buffsize    By default OSS will allocate audio DMA buffers with some
            system dependent default size (usually 64k but sometimes
            smaller). It is possible to change this default allocation by
            setting this option. Value of 0 means that the default size
            will be used. Value between 16 and 128 (kilobytes) can be used
            if the default size is not suitable for some reason.
            Default: 0 - system dependent buffsize.
            This option mustn't be changed unless it's absolutely necessary.

•
    max_intrate    Set the maximum number of interrupts per second.
            Default: 100 interrupts per second which equals to about
            10 msec minimum latencies.

•
    vmix_disabled    The virtual mixer subsystem can be disabled by setting
            this configuration option to 1.
            Default: 0 - virtual mixer is enabled.

•
    vmix_loopdevs    Optionally the virtual mixer subsystem can create
            special loopback audio devices that can be used to record the
            output mix sent to the device. This option tells how many
            loopback devices will be created (0, 1 or 2). If there are
            multiple audio devices in the system the all of them will have
            the same number of loopback devices.
            Default: 0 - no loopback devices are created.
            This setting should be left to 0 unless there are specific
            reasons to enable the loopback devices.

•
    vmix_no_autoattach    By default (0) the low level
            drivers for most sound cards will automatically
            attach virtual mixer (vmix) to the primary audio devices of the cards.
            In some situations it may be necessary to attach virtual mixer using
            nonstandard parameters. If vmix_no_autoattach is set to 1 then user
            can use vmixctl attach command to attach virtual mixer manually to
            the device(s).
            Default: 0 - Automatically attach virtual mixer.

FILES
/usr/lib/oss/conf/osscore.conf Device configuration file

AUTHOR
4Front Technologies