sound/core/Kconfig

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