sound/core/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 # ALSA soundcard-configuration
   3 config SND_TIMER
   4         tristate
   5
   6 config SND_PCM
   7         tristate
   8         select SND_TIMER if SND_PCM_TIMER
   9
  10 config SND_PCM_ELD
  11         bool
  12
  13 config SND_PCM_IEC958
  14         bool
  15
  16 config SND_DMAENGINE_PCM
  17         tristate
  18
  19 config SND_HWDEP
  20         tristate
  21
  22 config SND_SEQ_DEVICE
  23         tristate
  24
  25 config SND_RAWMIDI
  26         tristate
  27         select SND_SEQ_DEVICE if SND_SEQUENCER != n
  28
  29 config SND_COMPRESS_OFFLOAD
  30         tristate
  31
  32 config SND_JACK
  33         bool
  34
  35 # enable input device support in jack layer
  36 config SND_JACK_INPUT_DEV
  37         bool
  38         depends on SND_JACK
  39         default y if INPUT=y || INPUT=SND
  40
  41 config SND_OSSEMUL
  42         bool "Enable OSS Emulation"
  43         select SOUND_OSS_CORE
  44         help
  45           This option enables the build of OSS emulation layer.
  46
  47 config SND_MIXER_OSS
  48         tristate "OSS Mixer API"
  49         depends on SND_OSSEMUL
  50         help
  51           To enable OSS mixer API emulation (/dev/mixer*), say Y here
  52           and read <file:Documentation/sound/designs/oss-emulation.rst>.
  53
  54           Many programs still use the OSS API, so say Y.
  55
  56           To compile this driver as a module, choose M here: the module
  57           will be called snd-mixer-oss.
  58
  59 config SND_PCM_OSS
  60         tristate "OSS PCM (digital audio) API"
  61         depends on SND_OSSEMUL
  62         select SND_PCM
  63         help
  64           To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
  65           here and read <file:Documentation/sound/designs/oss-emulation.rst>.
  66
  67           Many programs still use the OSS API, so say Y.
  68
  69           To compile this driver as a module, choose M here: the module
  70           will be called snd-pcm-oss.
  71
  72 config SND_PCM_OSS_PLUGINS
  73         bool "OSS PCM (digital audio) API - Include plugin system"
  74         depends on SND_PCM_OSS
  75         default y
  76         help
  77           If you disable this option, the ALSA's OSS PCM API will not
  78           support conversion of channels, formats and rates. It will
  79           behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
  80
  81 config SND_PCM_TIMER
  82         bool "PCM timer interface" if EXPERT
  83         default y
  84         help
  85           If you disable this option, pcm timer will be unavailable, so
  86           those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
  87           incorrectlly.
  88
  89           For some embedded devices, we may disable it to reduce memory
  90           footprint, about 20KB on x86_64 platform.
  91
  92 config SND_HRTIMER
  93         tristate "HR-timer backend support"
  94         depends on HIGH_RES_TIMERS
  95         select SND_TIMER
  96         help
  97           Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
  98           the hrtimer as a precise timing source. The ALSA sequencer code
  99           also can use this timing source.
 100
 101           To compile this driver as a module, choose M here: the module
 102           will be called snd-hrtimer.
 103
 104 config SND_DYNAMIC_MINORS
 105         bool "Dynamic device file minor numbers"
 106         help
 107           If you say Y here, the minor numbers of ALSA device files in
 108           /dev/snd/ are allocated dynamically.  This allows you to have
 109           more than 8 sound cards, but requires a dynamic device file
 110           system like udev.
 111
 112           If you are unsure about this, say N here.
 113
 114 config SND_MAX_CARDS
 115         int "Max number of sound cards"
 116         range 4 256
 117         default 32
 118         depends on SND_DYNAMIC_MINORS
 119         help
 120           Specify the max number of sound cards that can be assigned
 121           on a single machine.
 122
 123 config SND_SUPPORT_OLD_API
 124         bool "Support old ALSA API"
 125         default y
 126         help
 127           Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
 128           or older).
 129
 130 config SND_PROC_FS
 131         bool "Sound Proc FS Support" if EXPERT
 132         depends on PROC_FS
 133         default y
 134         help
 135           Say 'N' to disable Sound proc FS, which may reduce code size about
 136           9KB on x86_64 platform.
 137           If unsure say Y.
 138
 139 config SND_VERBOSE_PROCFS
 140         bool "Verbose procfs contents"
 141         depends on SND_PROC_FS
 142         default y
 143         help
 144           Say Y here to include code for verbose procfs contents (provides
 145           useful information to developers when a problem occurs).  On the
 146           other side, it makes the ALSA subsystem larger.
 147
 148 config SND_VERBOSE_PRINTK
 149         bool "Verbose printk"
 150         help
 151           Say Y here to enable verbose log messages.  These messages
 152           will help to identify source file and position containing
 153           printed messages.
 154
 155           You don't need this unless you're debugging ALSA.
 156
 157 config SND_DEBUG
 158         bool "Debug"
 159         help
 160           Say Y here to enable ALSA debug code.
 161
 162 config SND_DEBUG_VERBOSE
 163         bool "More verbose debug"
 164         depends on SND_DEBUG
 165         help
 166           Say Y here to enable extra-verbose debugging messages.
 167
 168           Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
 169           So, say Y only if you are ready to be annoyed.
 170
 171 config SND_PCM_XRUN_DEBUG
 172         bool "Enable PCM ring buffer overrun/underrun debugging"
 173         default n
 174         depends on SND_DEBUG && SND_VERBOSE_PROCFS
 175         help
 176           Say Y to enable the PCM ring buffer overrun/underrun debugging.
 177           It is usually not required, but if you have trouble with
 178           sound clicking when system is loaded, it may help to determine
 179           the process or driver which causes the scheduling gaps.
 180
 181 config SND_VMASTER
 182         bool
 183
 184 config SND_DMA_SGBUF
 185         def_bool y
 186         depends on X86
 187
 188 source "sound/core/seq/Kconfig"