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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
  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_SEQUENCER_OSS
 97         bool "OSS Sequencer API"
 98         depends on SND_SEQUENCER
 99         select SND_OSSEMUL
100         help
101           Say Y here to enable OSS sequencer emulation (both
102           /dev/sequencer and /dev/music interfaces).
103 
104           Many programs still use the OSS API, so say Y.
105 
106           If you choose M in "Sequencer support" (SND_SEQUENCER),
107           this will be compiled as a module. The module will be called
108           snd-seq-oss.
109 
110 config SND_HRTIMER
111         tristate "HR-timer backend support"
112         depends on HIGH_RES_TIMERS
113         select SND_TIMER
114         help
115           Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
116           the hrtimer as a precise timing source. The ALSA sequencer code
117           also can use this timing source.
118 
119           To compile this driver as a module, choose M here: the module
120           will be called snd-hrtimer.
121 
122 config SND_SEQ_HRTIMER_DEFAULT
123         bool "Use HR-timer as default sequencer timer"
124         depends on SND_HRTIMER && SND_SEQUENCER
125         default y
126         help
127           Say Y here to use the HR-timer backend as the default sequencer
128           timer.
129 
130 config SND_RTCTIMER
131         tristate "RTC Timer support"
132         depends on RTC
133         select SND_TIMER
134         help
135           Say Y here to enable RTC timer support for ALSA.  ALSA uses
136           the RTC timer as a precise timing source and maps the RTC
137           timer to ALSA's timer interface.  The ALSA sequencer code also
138           can use this timing source.
139 
140           To compile this driver as a module, choose M here: the module
141           will be called snd-rtctimer.
142 
143           Note that this option is exclusive with the new RTC drivers
144           (CONFIG_RTC_CLASS) since this requires the old API.
145 
146 config SND_SEQ_RTCTIMER_DEFAULT
147         bool "Use RTC as default sequencer timer"
148         depends on SND_RTCTIMER && SND_SEQUENCER
149         depends on !SND_SEQ_HRTIMER_DEFAULT
150         default y
151         help
152           Say Y here to use the RTC timer as the default sequencer
153           timer.  This is strongly recommended because it ensures
154           precise MIDI timing even when the system timer runs at less
155           than 1000 Hz.
156 
157           If in doubt, say Y.
158 
159 config SND_DYNAMIC_MINORS
160         bool "Dynamic device file minor numbers"
161         help
162           If you say Y here, the minor numbers of ALSA device files in
163           /dev/snd/ are allocated dynamically.  This allows you to have
164           more than 8 sound cards, but requires a dynamic device file
165           system like udev.
166 
167           If you are unsure about this, say N here.
168 
169 config SND_MAX_CARDS
170         int "Max number of sound cards"
171         range 4 256
172         default 32
173         depends on SND_DYNAMIC_MINORS
174         help
175           Specify the max number of sound cards that can be assigned
176           on a single machine.
177 
178 config SND_SUPPORT_OLD_API
179         bool "Support old ALSA API"
180         default y
181         help
182           Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
183           or older).
184 
185 config SND_PROC_FS
186         bool "Sound Proc FS Support" if EXPERT
187         depends on PROC_FS
188         default y
189         help
190           Say 'N' to disable Sound proc FS, which may reduce code size about
191           9KB on x86_64 platform.
192           If unsure say Y.
193 
194 config SND_VERBOSE_PROCFS
195         bool "Verbose procfs contents"
196         depends on SND_PROC_FS
197         default y
198         help
199           Say Y here to include code for verbose procfs contents (provides
200           useful information to developers when a problem occurs).  On the
201           other side, it makes the ALSA subsystem larger.
202 
203 config SND_VERBOSE_PRINTK
204         bool "Verbose printk"
205         help
206           Say Y here to enable verbose log messages.  These messages
207           will help to identify source file and position containing
208           printed messages.
209 
210           You don't need this unless you're debugging ALSA.
211 
212 config SND_DEBUG
213         bool "Debug"
214         help
215           Say Y here to enable ALSA debug code.
216 
217 config SND_DEBUG_VERBOSE
218         bool "More verbose debug"
219         depends on SND_DEBUG
220         help
221           Say Y here to enable extra-verbose debugging messages.
222           
223           Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
224           So, say Y only if you are ready to be annoyed.
225 
226 config SND_PCM_XRUN_DEBUG
227         bool "Enable PCM ring buffer overrun/underrun debugging"
228         default n
229         depends on SND_DEBUG && SND_VERBOSE_PROCFS
230         help
231           Say Y to enable the PCM ring buffer overrun/underrun debugging.
232           It is usually not required, but if you have trouble with
233           sound clicking when system is loaded, it may help to determine
234           the process or driver which causes the scheduling gaps.
235 
236 config SND_VMASTER
237         bool
238 
239 config SND_DMA_SGBUF
240         def_bool y
241         depends on X86
242 
243 source "sound/core/seq/Kconfig"

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