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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 # 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"

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