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

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