¹Ìµð ÀåÄ¡´Â »ç¿îµå Ä«µå¿¡ Æ÷ÇԵǰųª º°µµÀÇ ÀåÄ¡·Î Á¸ÀçÇÑ´Ù. ¿ÜºÎ ¹Ìµð ÀÎÅÍÆäÀ̽º´Â ½Ã¸®¾ó Æ÷Æ®³ª USB Æ÷Æ®¿¡ ¿¬°áµÇ±âµµ ÇÑ´Ù.
ù¹øÂ° °¡Àå Áß¿äÇѰÍÀº ´ç½ÅÀÇ Ä«µå°¡ Áö¿øµÇ´Â °ÍÀÎÁö È®ÀÎÇÏ´Â °ÍÀÌ´Ù!
http://www.alsa-project.org/soundcards.php3
http://www.4front-tech.com/osshw.html
¸®´ª½º ¹èÆ÷º»ÀÇ ¼³Á¤À» º¯°æÇÏ¿© ¹Ìµð ÀåÄ¡µéÀ» ¼³Ä¡ÇÑ´Ù. °£´ÜÇϰÔ, ¸®´ª½º¸¦ Àß Áö¿øÇÏ´Â Ä«µåµéÀº OS¸¦ ¼³Ä¡ÇÒ ¶§ ¼³Á¤ÀÌ µÉ °ÍÀÌ´Ù.
¸®´ª½º Ä¿³ÎÀº OSS µå¶óÀ̹ö¿Í 2.5 ¹öÀü¿¡¼´Â ALSA µå¶óÀ̹ö¸¦ °¡Áö°í ÀÖ´Ù. ´ëºÎºÐÀÇ ¹èÆ÷º»µéÀº »ç¿îµå Ä«µå ¼³Á¤À» À§ÇÑ ÅøÀ» Á¦°øÇϴµ¥, »ç¿îµå Ä«µåÀÇ ¹Ìµð Æ÷Æ®¸¦ »ç¿ëÇÑ´Ù¸é À̰͵µ ¼³Á¤ÇÒ ¼ö ÀÖ´Ù. ·¹µåÇòÀº sndconfig, ¼ö¼¼´Â yast, ¸Çµå·¹ÀÌÅ©´Â DrakConf¸¦ »ç¿ëÇÑ´Ù.
¸¸¾à ÀÌ·± ÅøµéÀÌ ¹Ìµð ÀÎÅÍÆäÀ̽º¸¦ ¼³Á¤ÇÒ ¼ö ¾ø°Å³ª ¹®Á¦°¡ ÀÖ´Ù¸é ´ÙÀ½ ´Ü°è¸¦ µû¸¥´Ù:
lsmodÀÇ Ãâ·Â °á°ú°¡ ¹Ìµð °ü·Ã ¸ðµâÀ» Æ÷ÇÔÇϰí Àִ°¡? ´ÙÀ½Àº OSS ±â¹Ý ½Ã½ºÅÛ¿¡¼ÀÇ ÀüÇüÀûÀÎ Ãâ·Â ¿¹ÀÌ´Ù.
[root@beatbox]# lsmod Module Size Used by lockd 32208 1 (autoclean) sunrpc 54640 1 (autoclean) [lockd] autofs 9456 2 (autoclean) usb-ohci 12624 0 (unused) usbcore 43632 1 [usb-ohci] hisax 470096 0 (autoclean) (unused) isdn 104208 0 (autoclean) [hisax] slhc 4544 0 (autoclean) [isdn] eepro100 16144 1 (autoclean) #---- »ç¿îµå Ä«µå °ü·Ã ¸ðµâ opl3 11376 2 mad16 7968 1 ad1848 16848 1 [mad16] sb 34752 1 [mad16] uart401 6384 1 [mad16 sb] sound 58368 0 [opl3 mad16 ad1848 sb uart401] soundlow 464 0 [sound] soundcore 2800 6 [sb sound] nls_cp437 3952 2 (autoclean) vfat 9408 1 (autoclean) fat 30432 1 (autoclean) [vfat] ide-scsi 7664 0 |
mpu401, olp3, uart401, oss¸¦ º¸¶ó.
USB ÀåÄ¡¸¦ »ç¿ëÇϰí ÀÖ´Ù¸é USB ¸ðµâÀ» È®ÀÎÇÏ´Â °ÍÀ» ÀØÁö ¸»¶ó.
sndstat ÆÄÀÏÀ» È®ÀÎÇØ º»´Ù:
[root@beatbox]# cat /dev/sndstat OSS/Free:3.8s2++-971130 Load type: Driver loaded as a module Kernel: Linux mega 2.2.17-21mdk #1 Thu Oct 5 13:16:08 CEST 2000 i686 Config options: 0 Installed drivers: Card config: Audio devices: 0: MAD16 WSS (82C930) (DUPLEX) Synth devices: 0: Yamaha OPL3 Midi devices: 0: Mad16/Mozart Timers: 0: System clock Mixers: 0: MAD16 WSS (82C930) |
¿©±â¼ mad16ÀÌ ¹Ìµð ÀåÄ¡¶ó´Â °ÍÀ» ¾Ë ¼ö ÀÖÀ¸¸ç À̰ÍÀº À§ÀÇ lsmod Ãâ·Â¿¡¼µµ º¼ ¼ö ÀÖ¾ú´Ù.
¸¸¾à ¹Ìµð¿Í °ü·ÃµÈ °ÍÀÌ ¾Æ¹«°Íµµ Ãâ·ÂµÇÁö ¾Ê´Â´Ù¸é /etc/modules.conf ÆÄÀÏÀ» È®ÀÎÇØº»´Ù.
[root@beatbox]# cat /etc/modules.conf alias net-pf-4 ipx pre-install pcmcia_core /etc/rc.d/init.d/pcmcia start alias usb-interface usb-ohci alias parport_lowlevel parport_pc alias block-major-11 scsi_hostadapter pre-install plip modprobe parport_pc ; echo 7 > /proc/parport/0/irq alias scsi_hostadapter ide-scsi alias eth0 eepro100 alias eth1 hisax #---- »ç¿îµå Ä«µå alias sound-slot-0 mad16 options sound dmabuf=1 alias midi opl3 options opl3 io=0x388 options sb support=1 options mad16 io=0x530 irq=5 dma=0 dma16=1 mpu_io=0x300 mpu_irq=7 joystick=1 |
´ÙÀ½Àº ¹Ìµð ¸ðµâÀÌ ·ÎµåµÇ¾úÀ»¶§ /proc/modules À» È®ÀÎÇÑ °á°úÀÌ´Ù.
[root@mega /proc]# cat modules 0000-001f : dma1 0020-003f : pic1 0040-005f : timer 0060-006f : keyboard 0070-007f : rtc 0080-008f : dma page reg 00a0-00bf : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : ide1 01f0-01f7 : ide0 02f8-02ff : serial(auto) #---- ¹Ìµð ÀåÄ¡ 0300-0303 : MPU-401 UART 0376-0376 : ide1 0388-038b : Yamaha OPL3 03c0-03df : vga+ 03f6-03f6 : ide0 03f8-03ff : serial(auto) 0530-0533 : MAD16 WSS config 0534-0537 : MAD16 WSS de00-de1f : Intel Speedo3 Ethernet f000-f007 : ide0 f008-f00f : ide1 |
À§¿Í ºñ½ÁÇÑ °á°ú°¡ È®ÀεǾî¾ß ÇÑ´Ù. ±×·¸Áö ¾Ê´Ù¸é ¹Ìµð µå¶óÀ̹ö¸¦ ¼³Ä¡ÇؾßÇÒ Çʿ䰡 ÀÖ´Ù.
¸¸¾à ALSA 0.5x µå¶óÀ̹ö¸¦ »ç¿ëÇÒ °Í À̶ó¸é Valentijn Sessink°¡ ¾´ Alsa-sound-mini-HOWTO ¹®¼¸¦ Âü°íÇÑ´Ù:
http://www.linuxdoc.org/HOWTO/mini/Alsa-sound.html
ALSA µå¶óÀ̹ö 0.9x ÀÌÈÄ ¹öÀüÀº Madhu MaddyÀÇ ALSA-HOWTO ¹®¼¸¦ Àо¶ó.
http://www.alsa-project.org/alsa-doc/alsa-howto/
¾Æ·¡´Â ALSA 0.9 µå¶óÀ̹ö¿Í ´ëºÎºÐÀÇ ¹Ìµð ÇÁ·Î±×·¥ÀÇ ¼³Ä¡¸¦ À§ÇØ ÇÊ¿äÇÑ ¶óÀ̺귯¸®µéÀ» ¼³Ä¡Çϱâ À§ÇÑ ¿¹½ÃÀÌ´Ù.
[root@beatbox] # tar jxvf alsa-driver....tar.bz2 [root@beatbox] # cd alsa-driver..... [root@beatbox] # ./configure messages - no errors [root@beatbox] # make messages - no errors [root@beatbox] # make install messages - no errors [root@beatbox] # ./snddevices |
ÀÌÁ¦ /etc/modules.conf ÆÄÀÏÀ» ÆíÁýÇϴµ¥, ´Ù¸¥ ¹èÆ÷º»¿¡¼´Â ´Ù¸¥ µð·ºÅ丮¿¡ ÀÖÀ» ¼ö ÀÖ´Â ALSA ÆÄÀÏÀ» ÆíÁýÇÑ´Ù. ÆÄÀÏ¿¡´Â ¹Ìµð°¡ ¾Æ´Ñ ´Ù¸¥ ÀåÄ¡µéÀ» À§ÇÑ Á¤º¸µéµµ ÀÖÀ¸´Ï ÁÖÀÇÇØ¼ ´Ù·ç±â ¹Ù¶õ´Ù.
ÀϹÝÀûÀ¸·Î ¼³Á¤ ÆÄÀÏ¿¡´Â ALSA³ª OSS¸¦ À§ÇÑ ¿¹Àü ¼³Á¤µéÀÌ ÀûÇô ÀÖÀ» °ÍÀ̹ǷÎ, Áö¿ìµçÁö Ä¿¸ÇÆ® 󸮸¦ ÇϵçÁö ÇØ¾ß ÇÑ´Ù.
¾Æ·¡´Â OSS ±â¹ÝÀÇ ALSA ¼³Á¤À» À§ÇÑ ÀüÇüÀûÀÎ modules.conf ÆÄÀÏÀÌ´Ù.
alias char-major-116 snd alias char-major-14 soundcore alias snd-card-0 (MIDI/Sound card) alias sound-slot-0 snd-card-0 alias sound-service-0-0 snd-mixer-oss alias sound-service-0-1 snd-seq-oss alias sound-service-0-3 snd-pcm-oss alias sound-service-0-12 snd-pcm-oss |
(MIDI/Sound card) ºÎºÐ¿¡ ÀûÇÕÇÑ Ä«µå À̸§À» Àû´Â´Ù. ÀÌ Á¤º¸´Â ALSA À¥»çÀÌÆ®¿¡¼ ãÀ» ¼ö ÀÖ´Ù.
ÀÌÁ¦ ALSA ±â¹Ý ÇÁ·Î±×·¥µéÀ» ÀÌ¿ëÇϱâ À§ÇÑ ¶óÀ̺귯¸® ÆÄÀϵéÀ» ¼³Ä¡ÇؾßÇÑ´Ù. ÀÌ ÆÄÀϵéÀº alsa-libs ÆÐŰÁö¿¡ ÀÖ´Ù.
alsa-drivers ¿Í alsa-libs ÀÇ ½ÖÀ¸·Î ¸ÅÄ¡µÇ´Â °ÍÀ» È®ÀÎÇ϶ó!
[root@beatbox] # tar jxvf alsa-libs....tar.bz2 [root@beatbox] # cd alsa-libs..... [root@beatbox] # ./configure messages - no errors [root@beatbox] # make messages - no errors [root@beatbox] # make install |
ÀÌÁ¦ ¼³Á¤ÀÌ ³¡³µ´Ù :)
°£´ÜÇÑ C ÇÁ·Î±×·¥À¸·Î Ã¼Å©ÇØ º¼ ¼ö ÀÖ´Ù. ÀÌ ÇÁ·Î±×·¥ÀÌ ÄÄÆÄÀÏµÇ°í ½ÇÇàµÇ¸é ½Ã½ºÅÛ ¼³Á¤ÀÌ Á¦´ë·Î µÈ °ÍÀÌ´Ù.
// ÀÌ·¸°Ô ÄÄÆÄÀÏÇ϶ó: gcc alsatest.c -o alsatest -lasound #include <stdio.h> #include <alsa/asoundlib.h> int main (int argc, char *argv[]) { snd_seq_t *seq_handle; if (snd_seq_open(&seq_handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) { fprintf(stderr, "Error opening ALSA sequencer.\n"); exit(1); } printf("The ALSA libraries are installed.\n"); return 0; } |
¹Ìµð´Â ½Ç½Ã°£ ÇÁ·ÎÅäÄÝ·Î latency´Â ½É°¢ÇÑ ¹®Á¦°¡ µÉ ¼ö ÀÖ´Ù.
ÇöÀç ¸î¸î °³¹ßÀÚµéÀÌ À̰Ͱú °ü·ÃµÇ¾î ¸®´ª½º°¡ ¹Ìµð Ç÷§ÆûÀ¸·Î »ç¿ëÇϱâ ÀûÇÕÇϵµ·Ï Ä¿³Î ÇØÅ·À» Çϰí ÀÖ´Ù.
±âÁ¸ÀÇ ¸®´ª½º Ä¿³Îµµ º° ¹«¸®¾øÀÌ »ç¿ë°¡´É ÇÏÁö¸¸ low-latency ÆÐÄ¡¸¦ Àû¿ëÇÏ´Â °ÍÀÌ ÁÁ´Ù. ÀÚ¼¼ÇÑ Á¤º¸´Â ´ÙÀ½ ¸µÅ©¿¡¼ ãÀ» ¼ö ÀÖ´Ù: