1# ALSA soundcard-configuration 2config SND_TIMER 3 tristate 4 5config SND_PCM 6 tristate 7 select SND_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_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 110config 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 122config 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 130config 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 146config 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 159config 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 169config 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 178config 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 185config 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 194config 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 203config 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 212config SND_DEBUG 213 bool "Debug" 214 help 215 Say Y here to enable ALSA debug code. 216 217config 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 226config 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 236config SND_VMASTER 237 bool 238 239config SND_DMA_SGBUF 240 def_bool y 241 depends on X86 242 243source "sound/core/seq/Kconfig" 244