sound/core/Kconfig

   1 # ALSA soundcard-configuration
   2 config SND_TIMER
   3         tristate
   4
   5 config SND_PCM
   6         tristate
   7         select SND_TIMER if SND_PCM_TIMER
   8
   9 config SND_PCM_ELD
  10         bool
  11
  12 config SND_PCM_IEC958
  13         bool
  14
  15 config SND_DMAENGINE_PCM
  16         tristate
  17
  18 config SND_HWDEP
  19         tristate
  20
  21 config SND_RAWMIDI
  22         tristate
  23
  24 config SND_COMPRESS_OFFLOAD
  25         tristate
  26
  27 # To be effective this also requires INPUT - users should say:
  28 #    select SND_JACK if INPUT=y || INPUT=SND
  29 # to avoid having to force INPUT on.
  30 config SND_JACK
  31         bool
  32
  33 config SND_SEQUENCER
  34         tristate "Sequencer support"
  35         select SND_TIMER
  36         help
  37           Say Y or M to enable MIDI sequencer and router support.  This
  38           feature allows routing and enqueueing of MIDI events.  Events
  39           can be processed at a given time.
  40
  41           Many programs require this feature, so you should enable it
  42           unless you know what you're doing.
  43
  44 config SND_SEQ_DUMMY
  45         tristate "Sequencer dummy client"
  46         depends on SND_SEQUENCER
  47         help
  48           Say Y here to enable the dummy sequencer client.  This client
  49           is a simple MIDI-through client: all normal input events are
  50           redirected to the output port immediately.
  51
  52           You don't need this unless you want to connect many MIDI
  53           devices or applications together.
  54
  55           To compile this driver as a module, choose M here: the module
  56           will be called snd-seq-dummy.
  57
  58 config SND_OSSEMUL
  59         select SOUND_OSS_CORE
  60         bool
  61
  62 config SND_MIXER_OSS
  63         tristate "OSS Mixer API"
  64         select SND_OSSEMUL
  65         help
  66           To enable OSS mixer API emulation (/dev/mixer*), say Y here
  67           and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
  68
  69           Many programs still use the OSS API, so say Y.
  70
  71           To compile this driver as a module, choose M here: the module
  72           will be called snd-mixer-oss.
  73
  74 config SND_PCM_OSS
  75         tristate "OSS PCM (digital audio) API"
  76         select SND_OSSEMUL
  77         select SND_PCM
  78         help
  79           To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
  80           here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
  81
  82           Many programs still use the OSS API, so say Y.
  83
  84           To compile this driver as a module, choose M here: the module
  85           will be called snd-pcm-oss.
  86
  87 config SND_PCM_OSS_PLUGINS
  88         bool "OSS PCM (digital audio) API - Include plugin system"
  89         depends on SND_PCM_OSS
  90         default y
  91         help
  92           If you disable this option, the ALSA's OSS PCM API will not
  93           support conversion of channels, formats and rates. It will
  94           behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
  95
  96 config SND_PCM_TIMER
  97         bool "PCM timer interface" if EXPERT
  98         default y
  99         help
 100           If you disable this option, pcm timer will be inavailable, so
 101           those stubs used pcm timer (e.g. dmix, dsnoop & co) may work
 102           incorrectlly.
 103
 104           For some embedded device, we may disable it to reduce memory
 105           footprint, about 20KB on x86_64 platform.
 106
 107 config SND_SEQUENCER_OSS
 108         bool "OSS Sequencer API"
 109         depends on SND_SEQUENCER
 110         select SND_OSSEMUL
 111         help
 112           Say Y here to enable OSS sequencer emulation (both
 113           /dev/sequencer and /dev/music interfaces).
 114
 115           Many programs still use the OSS API, so say Y.
 116
 117           If you choose M in "Sequencer support" (SND_SEQUENCER),
 118           this will be compiled as a module. The module will be called
 119           snd-seq-oss.
 120
 121 config SND_HRTIMER
 122         tristate "HR-timer backend support"
 123         depends on HIGH_RES_TIMERS
 124         select SND_TIMER
 125         help
 126           Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
 127           the hrtimer as a precise timing source. The ALSA sequencer code
 128           also can use this timing source.
 129
 130           To compile this driver as a module, choose M here: the module
 131           will be called snd-hrtimer.
 132
 133 config SND_SEQ_HRTIMER_DEFAULT
 134         bool "Use HR-timer as default sequencer timer"
 135         depends on SND_HRTIMER && SND_SEQUENCER
 136         default y
 137         help
 138           Say Y here to use the HR-timer backend as the default sequencer
 139           timer.
 140
 141 config SND_RTCTIMER
 142         tristate "RTC Timer support"
 143         depends on RTC
 144         select SND_TIMER
 145         help
 146           Say Y here to enable RTC timer support for ALSA.  ALSA uses
 147           the RTC timer as a precise timing source and maps the RTC
 148           timer to ALSA's timer interface.  The ALSA sequencer code also
 149           can use this timing source.
 150
 151           To compile this driver as a module, choose M here: the module
 152           will be called snd-rtctimer.
 153
 154           Note that this option is exclusive with the new RTC drivers
 155           (CONFIG_RTC_CLASS) since this requires the old API.
 156
 157 config SND_SEQ_RTCTIMER_DEFAULT
 158         bool "Use RTC as default sequencer timer"
 159         depends on SND_RTCTIMER && SND_SEQUENCER
 160         depends on !SND_SEQ_HRTIMER_DEFAULT
 161         default y
 162         help
 163           Say Y here to use the RTC timer as the default sequencer
 164           timer.  This is strongly recommended because it ensures
 165           precise MIDI timing even when the system timer runs at less
 166           than 1000 Hz.
 167
 168           If in doubt, say Y.
 169
 170 config SND_DYNAMIC_MINORS
 171         bool "Dynamic device file minor numbers"
 172         help
 173           If you say Y here, the minor numbers of ALSA device files in
 174           /dev/snd/ are allocated dynamically.  This allows you to have
 175           more than 8 sound cards, but requires a dynamic device file
 176           system like udev.
 177
 178           If you are unsure about this, say N here.
 179
 180 config SND_MAX_CARDS
 181         int "Max number of sound cards"
 182         range 4 256
 183         default 32
 184         depends on SND_DYNAMIC_MINORS
 185         help
 186           Specify the max number of sound cards that can be assigned
 187           on a single machine.
 188
 189 config SND_SUPPORT_OLD_API
 190         bool "Support old ALSA API"
 191         default y
 192         help
 193           Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
 194           or older).
 195
 196 config SND_PROC_FS
 197         bool "Sound Proc FS Support" if EXPERT
 198         depends on PROC_FS
 199         default y
 200         help
 201           Say 'N' to disable Sound proc FS, which may reduce code size about
 202           9KB on x86_64 platform.
 203           If unsure say Y.
 204
 205 config SND_VERBOSE_PROCFS
 206         bool "Verbose procfs contents"
 207         depends on SND_PROC_FS
 208         default y
 209         help
 210           Say Y here to include code for verbose procfs contents (provides
 211           useful information to developers when a problem occurs).  On the
 212           other side, it makes the ALSA subsystem larger.
 213
 214 config SND_VERBOSE_PRINTK
 215         bool "Verbose printk"
 216         help
 217           Say Y here to enable verbose log messages.  These messages
 218           will help to identify source file and position containing
 219           printed messages.
 220
 221           You don't need this unless you're debugging ALSA.
 222
 223 config SND_DEBUG
 224         bool "Debug"
 225         help
 226           Say Y here to enable ALSA debug code.
 227
 228 config SND_DEBUG_VERBOSE
 229         bool "More verbose debug"
 230         depends on SND_DEBUG
 231         help
 232           Say Y here to enable extra-verbose debugging messages.
 233
 234           Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
 235           So, say Y only if you are ready to be annoyed.
 236
 237 config SND_PCM_XRUN_DEBUG
 238         bool "Enable PCM ring buffer overrun/underrun debugging"
 239         default n
 240         depends on SND_DEBUG && SND_VERBOSE_PROCFS
 241         help
 242           Say Y to enable the PCM ring buffer overrun/underrun debugging.
 243           It is usually not required, but if you have trouble with
 244           sound clicking when system is loaded, it may help to determine
 245           the process or driver which causes the scheduling gaps.
 246
 247 config SND_VMASTER
 248         bool
 249
 250 config SND_DMA_SGBUF
 251         def_bool y
 252         depends on X86
 253
 254 source "sound/core/seq/Kconfig"