1 Legacy audio driver for YMF7xx PCI cards.
7 This code references YAMAHA's sample codes and data sheets.
8 I respect and thank for all people they made open the informations
11 And this codes heavily based on Jeff Garzik <jgarzik@pobox.com>'s
12 old VIA 82Cxxx driver (via82cxxx.c). I also respect him.
18 This driver is currently at early ALPHA stage. It may cause serious
19 damage to your computer when used.
20 PLEASE USE IT AT YOUR OWN RISK.
26 This code enables you to use your YMF724[A-F], YMF740[A-C], YMF744, YMF754
27 cards. When enabled, your card acts as "SoundBlaster Pro" compatible card.
28 It can only play 22.05kHz / 8bit / Stereo samples, control external MIDI
30 If you want to use your card as recent "16-bit" card, you should use
31 Alsa or OSS/Linux driver. Of course you can write native PCI driver for
38 # modprobe ymfsb (options)
44 io : SB base address (0x220, 0x240, 0x260, 0x280)
45 synth_io : OPL3 base address (0x388, 0x398, 0x3a0, 0x3a8)
46 dma : DMA number (0,1,3)
47 master_volume: AC'97 PCM out Vol (0-100)
48 spdif_out : SPDIF-out flag (0:disable 1:enable)
50 These options will change in future...
56 When playing sounds via this driver, you will hear its pitch is slightly
57 lower than original sounds. Since this driver recognizes your card acts
58 with 21.739kHz sample rates rather than 22.050kHz (I think it must be
59 hardware restriction). So many players become tone deafness.
60 To prevent this, you should express some options to your sound player
61 that specify correct sample frequency. For example, to play your MP3 file
62 correctly with mpg123, specify the frequency like following:
64 % mpg123 -r 21739 foo.mp3
70 With installing modules with option 'spdif_out=1', you can enjoy your
71 sounds from SPDIF-out of your card (if it had).
72 Its Fs is fixed to 48kHz (It never means the sample frequency become
73 up to 48kHz. All sounds via SPDIF-out also 22kHz samples). So your
74 digital-in capable components has to be able to handle 48kHz Fs.
80 This program is free software; you can redistribute it and/or modify
81 it under the terms of the GNU General Public License as published by
82 the Free Software Foundation; either version 2, or (at your option)
85 This program is distributed in the hope that it will be useful, but
86 WITHOUT ANY WARRANTY; without even the implied warranty of
87 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
88 General Public License for more details.
90 You should have received a copy of the GNU General Public License
91 along with this program; if not, write to the Free Software
92 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
97 * support for multiple cards
98 (set the different SB_IO,MPU_IO,OPL_IO for each cards)
100 * support for OPL (dmfm) : There will be no requirements... :-<
106 Daisuke Nagano <breeze.nagano@nifty.ne.jp>