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