1# ALSA soundcard-configuration 2config SND_TIMER 3 tristate 4 5config SND_PCM 6 tristate 7 select SND_TIMER if SND_PCM_TIMER 8 9config SND_PCM_ELD 10 bool 11 12config SND_PCM_IEC958 13 bool 14 15config SND_DMAENGINE_PCM 16 tristate 17 18config SND_HWDEP 19 tristate 20 21config SND_RAWMIDI 22 tristate 23 24config 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. 30config SND_JACK 31 bool 32 33config 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 44config 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 58config SND_OSSEMUL 59 select SOUND_OSS_CORE 60 bool 61 62config 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 74config 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 87config 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 96config 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 107config 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 121config 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 133config 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 141config 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 157config 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 170config 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 180config 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 189config 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 196config 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 205config 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 214config 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 223config SND_DEBUG 224 bool "Debug" 225 help 226 Say Y here to enable ALSA debug code. 227 228config 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 237config 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 247config SND_VMASTER 248 bool 249 250config SND_DMA_SGBUF 251 def_bool y 252 depends on X86 253 254source "sound/core/seq/Kconfig" 255