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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_DMAENGINE_PCM
 10         tristate
 11 
 12 config SND_HWDEP
 13         tristate
 14 
 15 config SND_RAWMIDI
 16         tristate
 17 
 18 config SND_COMPRESS_OFFLOAD
 19         tristate
 20 
 21 # To be effective this also requires INPUT - users should say:
 22 #    select SND_JACK if INPUT=y || INPUT=SND
 23 # to avoid having to force INPUT on.
 24 config SND_JACK
 25         bool
 26 
 27 config SND_SEQUENCER
 28         tristate "Sequencer support"
 29         select SND_TIMER
 30         help
 31           Say Y or M to enable MIDI sequencer and router support.  This
 32           feature allows routing and enqueueing of MIDI events.  Events
 33           can be processed at a given time.
 34 
 35           Many programs require this feature, so you should enable it
 36           unless you know what you're doing.
 37 
 38 config SND_SEQ_DUMMY
 39         tristate "Sequencer dummy client"
 40         depends on SND_SEQUENCER
 41         help
 42           Say Y here to enable the dummy sequencer client.  This client
 43           is a simple MIDI-through client: all normal input events are
 44           redirected to the output port immediately.
 45 
 46           You don't need this unless you want to connect many MIDI
 47           devices or applications together.
 48 
 49           To compile this driver as a module, choose M here: the module
 50           will be called snd-seq-dummy.
 51 
 52 config SND_OSSEMUL
 53         select SOUND_OSS_CORE
 54         bool
 55 
 56 config SND_MIXER_OSS
 57         tristate "OSS Mixer API"
 58         select SND_OSSEMUL
 59         help
 60           To enable OSS mixer API emulation (/dev/mixer*), say Y here
 61           and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
 62 
 63           Many programs still use the OSS API, so say Y.
 64 
 65           To compile this driver as a module, choose M here: the module
 66           will be called snd-mixer-oss.
 67 
 68 config SND_PCM_OSS
 69         tristate "OSS PCM (digital audio) API"
 70         select SND_OSSEMUL
 71         select SND_PCM
 72         help
 73           To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
 74           here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
 75 
 76           Many programs still use the OSS API, so say Y.
 77 
 78           To compile this driver as a module, choose M here: the module
 79           will be called snd-pcm-oss.
 80 
 81 config SND_PCM_OSS_PLUGINS
 82         bool "OSS PCM (digital audio) API - Include plugin system"
 83         depends on SND_PCM_OSS
 84         default y
 85         help
 86           If you disable this option, the ALSA's OSS PCM API will not
 87           support conversion of channels, formats and rates. It will
 88           behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
 89 
 90 config SND_SEQUENCER_OSS
 91         bool "OSS Sequencer API"
 92         depends on SND_SEQUENCER
 93         select SND_OSSEMUL
 94         help
 95           Say Y here to enable OSS sequencer emulation (both
 96           /dev/sequencer and /dev/music interfaces).
 97 
 98           Many programs still use the OSS API, so say Y.
 99 
100           If you choose M in "Sequencer support" (SND_SEQUENCER),
101           this will be compiled as a module. The module will be called
102           snd-seq-oss.
103 
104 config SND_HRTIMER
105         tristate "HR-timer backend support"
106         depends on HIGH_RES_TIMERS
107         select SND_TIMER
108         help
109           Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
110           the hrtimer as a precise timing source. The ALSA sequencer code
111           also can use this timing source.
112 
113           To compile this driver as a module, choose M here: the module
114           will be called snd-hrtimer.
115 
116 config SND_SEQ_HRTIMER_DEFAULT
117         bool "Use HR-timer as default sequencer timer"
118         depends on SND_HRTIMER && SND_SEQUENCER
119         default y
120         help
121           Say Y here to use the HR-timer backend as the default sequencer
122           timer.
123 
124 config SND_RTCTIMER
125         tristate "RTC Timer support"
126         depends on RTC
127         select SND_TIMER
128         help
129           Say Y here to enable RTC timer support for ALSA.  ALSA uses
130           the RTC timer as a precise timing source and maps the RTC
131           timer to ALSA's timer interface.  The ALSA sequencer code also
132           can use this timing source.
133 
134           To compile this driver as a module, choose M here: the module
135           will be called snd-rtctimer.
136 
137           Note that this option is exclusive with the new RTC drivers
138           (CONFIG_RTC_CLASS) since this requires the old API.
139 
140 config SND_SEQ_RTCTIMER_DEFAULT
141         bool "Use RTC as default sequencer timer"
142         depends on SND_RTCTIMER && SND_SEQUENCER
143         depends on !SND_SEQ_HRTIMER_DEFAULT
144         default y
145         help
146           Say Y here to use the RTC timer as the default sequencer
147           timer.  This is strongly recommended because it ensures
148           precise MIDI timing even when the system timer runs at less
149           than 1000 Hz.
150 
151           If in doubt, say Y.
152 
153 config SND_DYNAMIC_MINORS
154         bool "Dynamic device file minor numbers"
155         help
156           If you say Y here, the minor numbers of ALSA device files in
157           /dev/snd/ are allocated dynamically.  This allows you to have
158           more than 8 sound cards, but requires a dynamic device file
159           system like udev.
160 
161           If you are unsure about this, say N here.
162 
163 config SND_MAX_CARDS
164         int "Max number of sound cards"
165         range 4 256
166         default 32
167         depends on SND_DYNAMIC_MINORS
168         help
169           Specify the max number of sound cards that can be assigned
170           on a single machine.
171 
172 config SND_SUPPORT_OLD_API
173         bool "Support old ALSA API"
174         default y
175         help
176           Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
177           or older).
178 
179 config SND_VERBOSE_PROCFS
180         bool "Verbose procfs contents"
181         depends on 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_KCTL_JACK
225         bool
226 
227 config SND_DMA_SGBUF
228         def_bool y
229         depends on X86
230 
231 source "sound/core/seq/Kconfig"

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