248 lines
6.7 KiB
Plaintext
248 lines
6.7 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see misc/tools/kconfig-language.txt.
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#
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config AUDIO
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bool "Audio Support"
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default n
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---help---
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Enables overall support for Audio library.
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if AUDIO
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config AUDIO_MULTI_SESSION
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bool "Support multiple sessions"
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default n
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---help---
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Some audio devices, such as USB attached sound cards, may support more
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than one streaming session at a time (each with one or more audio channels).
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Selecting this feature adds support for tracking multiple concurrent
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sessions with the lower-level audio devices.
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menu "Audio Buffer Configuration"
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config AUDIO_LARGE_BUFFERS
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bool "Support Audio Buffers with greater than 65K samples"
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default n
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---help---
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By default, the Audio Pipeline Buffers use a 16-bit max sample count, limiting
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the number of samples per buffer to 65K. Enable this option to specify a
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32-bit max sample count for increased samples / buffer capability.
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channel capability.
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config AUDIO_NUM_BUFFERS
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int "Number of buffers for audio processing"
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default 2
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---help---
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Specifies the number of buffers to allocate for audio processing.
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If Driver Specified buffer sizes is enabled (below), then the
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low-level drivers will have the opportunity to override this
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value.
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config AUDIO_BUFFER_NUMBYTES
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int "Size of each audio buffer for audio processing"
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default 8192
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---help---
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Specifies the allocation size for each audio buffer
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If Driver Specified buffer sizes is enabled (below), then the
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low-level drivers will have the opportunity to override this
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value.
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config AUDIO_DRIVER_SPECIFIC_BUFFERS
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bool "Support for Driver specified buffer sizes"
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default n
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---help---
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By default, the Audio system uses the same size and number of buffers
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regardless of the specific audio device in use. Specifying 'y' here
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adds extra code which allows the lower-level audio device to specify
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a partucular size and number of buffers.
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endmenu # Audio Buffer Configuration
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menu "Supported Audio Formats"
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config AUDIO_FORMAT_AC3
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bool "AC3 Format"
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default n
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---help---
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Build in support for AC3 (Dolby Digital) Audio format.
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config AUDIO_FORMAT_DTS
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bool "DTS Format"
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default n
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---help---
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Add in support for DTS format.
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config AUDIO_FORMAT_PCM
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bool "PCM Audio"
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default y
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---help---
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Build in support for PCM Audio format.
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config AUDIO_FORMAT_MP3
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bool "MPEG 3 Layer 1"
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default y
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---help---
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Build in support for MP3 Audio format.
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config AUDIO_FORMAT_MIDI
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bool "Midi Format"
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default n
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---help---
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Add in support for MIDI format.
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config AUDIO_FORMAT_WMA
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bool "WMA Format (see copyright notice)"
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default n
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---help---
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Add in support for Microsoft Windows Media format.
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config AUDIO_FORMAT_OGG_VORBIS
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bool "Ogg Vorbis format"
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default n
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---help---
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Build in support for the Open Source Ogg Vorbis format.
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endmenu
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menu "Exclude Specific Audio Features"
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config AUDIO_EXCLUDE_VOLUME
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bool "Exclude volume controls"
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default n
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---help---
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Exclude building support for changing the playback volume.
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config AUDIO_EXCLUDE_BALANCE
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bool "Exclude balance controls"
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default n
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---help---
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Exclude building support for changing the balance.
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config AUDIO_EXCLUDE_EQUALIZER
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bool "Exclude equalizer controls"
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default y
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---help---
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Exclude building support for setting equalization.
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config AUDIO_EQUALIZER_NBANDS
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int "Number of equalizer bands"
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default 8
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depends on !AUDIO_EXCLUDE_EQUALIZER
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---help---
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If equalizer support is not excluded, then it will be necessary to
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provide the (maximum) number of equalization bands to be supported.
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config AUDIO_EXCLUDE_TONE
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bool "Exclude tone (bass and treble) controls"
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default y if !AUDIO_EXCLUDE_EQUALIZER
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default n if AUDIO_EXCLUDE_EQUALIZER
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---help---
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Exclude building support for changing the bass and treble. Normally
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you would not select both tone controls and equalizer support unless
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your underlying hardware supports both options.
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config AUDIO_EXCLUDE_PAUSE_RESUME
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bool "Exclude pause and resume controls"
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default n
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---help---
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Exclude building support for pausing and resuming audio files
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once they are submitted. If the sound system is being used to play
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short system notification or error type sounds that typicaly only
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last a second or two, then there is no need (or chance) to pause or
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resume sound playback once it has started.
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config AUDIO_EXCLUDE_STOP
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bool "Exclude stop playback controls"
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default n
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---help---
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Exclude building support for stopping audio files once they are
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submitted. If the sound system is being used to play short sytem
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notification or error type sounds that typically only last a second
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or two, then there is no need (or chance) to stop the sound
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playback once it has started.
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config AUDIO_EXCLUDE_FFORWARD
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bool "Exclude fast forward controls"
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default n if !AUDIO_EXCLUDE_STOP
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default y if AUDIO_EXCLUDE_STOP
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---help---
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Exclude building support for fast forwarding through audio files
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once they are submitted. Selecting this option would only make
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if the underlying audio decoding logic is capable of sub-sampling
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in the stream of audio data.
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config AUDIO_EXCLUDE_REWIND
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bool "Exclude rewind controls"
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default y
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---help---
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Rewind may be supported by some audio devices, but not the typical
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device that receives a non-seekable, stream of audio buffers.
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endmenu
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config AUDIO_CUSTOM_DEV_PATH
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bool "Use custom device path"
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default n
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---help---
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By default, all audio devices on the target are are registered in the
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/dev/audio directory. Select this option to change the default location
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for the device registration.
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if AUDIO_CUSTOM_DEV_PATH
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config AUDIO_DEV_ROOT
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bool "Place audio devices in /dev"
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default n
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---help---
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This option causes all device entries to appear in /dev with all the
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other device entries. This option generates the smallest code and
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RAM footprint.
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if !AUDIO_DEV_ROOT
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config AUDIO_DEV_PATH
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string "Base path for Audio devices"
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default "/dev/audio"
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---help---
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The path on the target where audio devices are registered. The default
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is to place all audio devices in the /dev/audio/ directory.
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endif
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endif
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# These are here as placeholders of what could be added
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if AUDIO_PLANNED
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config AUDIO_MIXER
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bool "Planned - Enable support for the software based Audio Mixer"
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default n
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---help---
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The Audio mixer is a software-only based component that can be used
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to perform audio channel or device mixing.
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config AUDIO_MIDI_SYNTH
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bool "Planned - Enable support for the software-based MIDI synthisizer"
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default n
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---help---
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Builds a simple MIDI synthisizer.
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config AUDIO_OUTPUT_JACK_CONTROL
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bool "Planned - Enable support for output jack control"
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default n
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---help---
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Builds a simple MIDI synthisizer.
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config AUDIO_FONT
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bool "Planned - Enable support for the Audio Font"
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default n
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---help---
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The Audio font provides common audio symbols.
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endif
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endif
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