1 Legacy audio driver for YMF7xx PCI cards.
2
3
4 FIRST OF ALL
5 ============
6
7 This code references YAMAHA's sample codes and data sheets.
8 I respect and thank for all people they made open the informations
9 about YMF7xx cards.
10
11 And this codes heavily based on Jeff Garzik <jgarzik@pobox.com>'s
12 old VIA 82Cxxx driver (via82cxxx.c). I also respect him.
13
14
15 DISCLIMER
16 =========
17
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.
21
22
23 ABOUT THIS DRIVER
24 =================
25
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
29 port.
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
32 your cards :)
33
34
35 USAGE
36 =====
37
38 # modprobe ymfsb (options)
39
40
41 OPTIONS FOR MODULE
42 ==================
43
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)
49
50 These options will change in future...
51
52
53 FREQUENCY
54 =========
55
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:
63
64 % mpg123 -r 21739 foo.mp3
65
66
67 SPDIF OUT
68 =========
69
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.
75
76
77 COPYING
78 =======
79
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)
83 any later version.
84
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.
89
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.
93
94
95 TODO
96 ====
97 * support for multiple cards
98 (set the different SB_IO,MPU_IO,OPL_IO for each cards)
99
100 * support for OPL (dmfm) : There will be no requirements... :-<
101
102
103 AUTHOR
104 ======
105
106 Daisuke Nagano <breeze.nagano@nifty.ne.jp>
107
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