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- Legacy audio driver for YMF7xx PCI cards.
- FIRST OF ALL
- ============
- This code references YAMAHA's sample codes and data sheets.
- I respect and thank for all people they made open the information
- about YMF7xx cards.
- And this codes heavily based on Jeff Garzik <jgarzik@pobox.com>'s
- old VIA 82Cxxx driver (via82cxxx.c). I also respect him.
- DISCLIMER
- =========
- This driver is currently at early ALPHA stage. It may cause serious
- damage to your computer when used.
- PLEASE USE IT AT YOUR OWN RISK.
- ABOUT THIS DRIVER
- =================
- This code enables you to use your YMF724[A-F], YMF740[A-C], YMF744, YMF754
- cards. When enabled, your card acts as "SoundBlaster Pro" compatible card.
- It can only play 22.05kHz / 8bit / Stereo samples, control external MIDI
- port.
- If you want to use your card as recent "16-bit" card, you should use
- Alsa or OSS/Linux driver. Of course you can write native PCI driver for
- your cards :)
- USAGE
- =====
- # modprobe ymfsb (options)
- OPTIONS FOR MODULE
- ==================
- io : SB base address (0x220, 0x240, 0x260, 0x280)
- synth_io : OPL3 base address (0x388, 0x398, 0x3a0, 0x3a8)
- dma : DMA number (0,1,3)
- master_volume: AC'97 PCM out Vol (0-100)
- spdif_out : SPDIF-out flag (0:disable 1:enable)
- These options will change in future...
- FREQUENCY
- =========
- When playing sounds via this driver, you will hear its pitch is slightly
- lower than original sounds. Since this driver recognizes your card acts
- with 21.739kHz sample rates rather than 22.050kHz (I think it must be
- hardware restriction). So many players become tone deafness.
- To prevent this, you should express some options to your sound player
- that specify correct sample frequency. For example, to play your MP3 file
- correctly with mpg123, specify the frequency like following:
- % mpg123 -r 21739 foo.mp3
- SPDIF OUT
- =========
- With installing modules with option 'spdif_out=1', you can enjoy your
- sounds from SPDIF-out of your card (if it had).
- Its Fs is fixed to 48kHz (It never means the sample frequency become
- up to 48kHz. All sounds via SPDIF-out also 22kHz samples). So your
- digital-in capable components has to be able to handle 48kHz Fs.
- COPYING
- =======
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- TODO
- ====
- * support for multiple cards
- (set the different SB_IO,MPU_IO,OPL_IO for each cards)
- * support for OPL (dmfm) : There will be no requirements... :-<
- AUTHOR
- ======
- Daisuke Nagano <breeze.nagano@nifty.ne.jp>
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