Christian Hiris wrote:
AFAIK the define is named DSP_BUFFSIZE (in src/sys/dev/sound/pcm/sound.h. DSP_BUFFSIZE can be used to define the default buffersize for sound drivers, but most of the sound drivers use their own defines.
If you want to change the default buffersize for a sound driver you need to search for a define like xxx_BUFFSIZE, where xxx is the name of the sound driver (maybe some developers use other naming-conventions).
ie., if you want to change the default buffersize of the ESS driver you need to change the line "#define ESS_BUFFSIZE (4096)" in src/sys/dev/sound/isa/ess.c.
If you use the sbc driver, you need to do this changes in sb8.c or sb16.c, depending on the soundcard you are using. sbc.c is only the code for the corresponding bridge driver.
However, I'm not a guru, so I can't guess, if a driver works better with any other buffer size defined, than the original one.
Yes, This Worked!
stumbleine# pwd /usr/src/sys/dev/sound/isa
stumbleine# diff ess.c ess.bak 41c41 < #define ESS_BUFFSIZE (8192) --- > #define ESS_BUFFSIZE (4096)
stumbleine# diff sb16.c sb16.bak 41c41 < #define SB16_BUFFSIZE 8192 --- > #define SB16_BUFFSIZE 4096
Kernel Config file: options PNPBIOS device pcm # Generic Sound Support device sbc0 at isa? port 0x220 irq 10 drq 1
stumbleine# dmesg | grep ESS sbc0: <ESS 1688> at port 0x220-0x22f irq 10 drq 1 on isa0 pcm0: <ESS 18xx DSP> on sbc0
stumbleine# sysctl hw.snd hw.snd.targetirqrate: 32 hw.snd.report_soft_formats: 1 hw.snd.verbose: 1 hw.snd.maxautovchans: 0 hw.snd.pcm0.buffersize: 8192 hw.snd.pcm0.vchans: 0
stumbleine# uname -a
FreeBSD stumbleine.intranet 4.10-STABLE FreeBSD 4.10-STABLE #3: Tue Dec 14 23:40:48 CST 2004 [EMAIL PROTECTED]:/usr/src/sys/compile/STUMBLEINE i386
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