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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_RTCTIMER
145         tristate "RTC Timer support"
146         depends on RTC
147         select SND_TIMER
148         help
149           Say Y here to enable RTC timer support for ALSA.  ALSA uses
150           the RTC timer as a precise timing source and maps the RTC
151           timer to ALSA's timer interface.  The ALSA sequencer code also
152           can use this timing source.
153 
154           To compile this driver as a module, choose M here: the module
155           will be called snd-rtctimer.
156 
157           Note that this option is exclusive with the new RTC drivers
158           (CONFIG_RTC_CLASS) since this requires the old API.
159 
160 config SND_SEQ_RTCTIMER_DEFAULT
161         bool "Use RTC as default sequencer timer"
162         depends on SND_RTCTIMER && SND_SEQUENCER
163         depends on !SND_SEQ_HRTIMER_DEFAULT
164         default y
165         help
166           Say Y here to use the RTC timer as the default sequencer
167           timer.  This is strongly recommended because it ensures
168           precise MIDI timing even when the system timer runs at less
169           than 1000 Hz.
170 
171           If in doubt, say Y.
172 
173 config SND_DYNAMIC_MINORS
174         bool "Dynamic device file minor numbers"
175         help
176           If you say Y here, the minor numbers of ALSA device files in
177           /dev/snd/ are allocated dynamically.  This allows you to have
178           more than 8 sound cards, but requires a dynamic device file
179           system like udev.
180 
181           If you are unsure about this, say N here.
182 
183 config SND_MAX_CARDS
184         int "Max number of sound cards"
185         range 4 256
186         default 32
187         depends on SND_DYNAMIC_MINORS
188         help
189           Specify the max number of sound cards that can be assigned
190           on a single machine.
191 
192 config SND_SUPPORT_OLD_API
193         bool "Support old ALSA API"
194         default y
195         help
196           Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
197           or older).
198 
199 config SND_PROC_FS
200         bool "Sound Proc FS Support" if EXPERT
201         depends on PROC_FS
202         default y
203         help
204           Say 'N' to disable Sound proc FS, which may reduce code size about
205           9KB on x86_64 platform.
206           If unsure say Y.
207 
208 config SND_VERBOSE_PROCFS
209         bool "Verbose procfs contents"
210         depends on SND_PROC_FS
211         default y
212         help
213           Say Y here to include code for verbose procfs contents (provides
214           useful information to developers when a problem occurs).  On the
215           other side, it makes the ALSA subsystem larger.
216 
217 config SND_VERBOSE_PRINTK
218         bool "Verbose printk"
219         help
220           Say Y here to enable verbose log messages.  These messages
221           will help to identify source file and position containing
222           printed messages.
223 
224           You don't need this unless you're debugging ALSA.
225 
226 config SND_DEBUG
227         bool "Debug"
228         help
229           Say Y here to enable ALSA debug code.
230 
231 config SND_DEBUG_VERBOSE
232         bool "More verbose debug"
233         depends on SND_DEBUG
234         help
235           Say Y here to enable extra-verbose debugging messages.
236           
237           Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
238           So, say Y only if you are ready to be annoyed.
239 
240 config SND_PCM_XRUN_DEBUG
241         bool "Enable PCM ring buffer overrun/underrun debugging"
242         default n
243         depends on SND_DEBUG && SND_VERBOSE_PROCFS
244         help
245           Say Y to enable the PCM ring buffer overrun/underrun debugging.
246           It is usually not required, but if you have trouble with
247           sound clicking when system is loaded, it may help to determine
248           the process or driver which causes the scheduling gaps.
249 
250 config SND_VMASTER
251         bool
252 
253 config SND_DMA_SGBUF
254         def_bool y
255         depends on X86
256 
257 source "sound/core/seq/Kconfig"

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