From: liljeber@hydra.Helsinki.FI (Mika Liljeberg) Subject: Re: ANNOUNCE: Sound for Linux 0.99 (Sound driver v 0.4) Date: 17 Dec 1992 22:10:16 GMT
In article <kenc.724299040@sol> kenc@sol.acs.unt.edu (Ken Corey - Operator) wrote:
> hsavolai@cs.Helsinki.FI (Hannu Savolainen) writes:
>>The version 0.4 of the Sound Card Driver is available at nic.funet.fi
>>(pub/OS/Linux/xtra/snd-kit/snd-driv-0.4.tar.Z)
>
> Pardon me if my stupidity is hanging out here...but what exactly can a Sound
> Blaster Pro be used for when running linux? Are there programs to let us
> play SunOS sounds (Whatever the format they're in is called)?
Sure, just pluck in the following patch. :-) I took a few moments to
write it, since the capability was still missing from 0.4 (/dev/audio
is there, mind you, just the conversion code was absent).
I have a weird (latency?) problem with my modem, though. DTR and RTS
go down almost immediately, when I copy something to /dev/audio (only
with my patch). I'd like to hear, if everyone has this problem. I
don't understand this behaviour at all. Oh, consider this a WARNING!
Don't try to play Sun audio files, while using the modem :-)
The patch should also support digitizing Sun-style samples. I haven't
been able to test this, though.
Have fun,
Mika
==============================================================================
--- audio.c.org Tue Dec 15 00:02:00 1992
+++ audio.c Tue Dec 15 03:11:02 1992
@@ -23,6 +23,8 @@
#ifdef CONFIGURE_SOUNDCARD
+#include "ulaw.h"
+
#define OUTB outb
#define DEB(WHAT) /* (WHAT) */
#define DEB1(WHAT) /* (WHAT) */
@@ -68,6 +70,16 @@
DMAbuf_release (dev, mode);
}
+extern inline void translate_bytes(const void *table, void *buff, unsigned long n)
+{
+ __asm__("cld\n"
+ "1:\tlodsb\n\t"
+ "xlatb\n\t"
+ "stosb\n\t"
+ "loop 1b\n\t"
+ ::"b" ((long)table), "c" (n), "D" ((long)buff), "S" ((long)buff)
+ :"bx","cx","di","si");
+}
int
audio_write (struct inode *inode, struct file *file, char *buf, int count)
@@ -107,7 +119,8 @@
memcpy_fromfs (&wr_dma_buf[wr_buff_ptr], &buf[p], l);
- /* Insert local processing here */
+ /* Insert local processing here */
+ translate_bytes(ulaw_dsp, &wr_dma_buf[wr_buff_ptr], l);
c -= l;
p += l;
@@ -148,6 +161,7 @@
l = c;
/* Insert any local processing here. */
+ translate_bytes(dsp_ulaw, dmabuf, l);
memcpy_tofs (buf, dmabuf, l);
--- /dev/null Fri Aug 7 22:53:49 1992
+++ ulaw.h Tue Dec 15 01:51:44 1992
@@ -0,0 +1,69 @@
+static unsigned char ulaw_dsp[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 2,
+ 5, 9, 13, 17, 21, 25, 29, 33,
+ 37, 41, 45, 49, 53, 57, 61, 65,
+ 68, 70, 72, 74, 76, 78, 80, 82,
+ 84, 86, 88, 90, 92, 94, 96, 98,
+ 100, 101, 102, 103, 104, 105, 106, 107,
+ 108, 109, 110, 111, 112, 113, 114, 115,
+ 115, 116, 116, 117, 117, 118, 118, 119,
+ 119, 120, 120, 121, 121, 122, 122, 123,
+ 123, 123, 124, 124, 124, 124, 125, 125,
+ 125, 125, 126, 126, 126, 126, 127, 127,
+ 127, 127, 127, 127, 128, 128, 128, 128,
+ 128, 128, 128, 128, 128, 128, 128, 128,
+ 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 255,
+ 252, 248, 244, 240, 236, 232, 228, 224,
+ 220, 216, 212, 208, 204, 200, 196, 192,
+ 189, 187, 185, 183, 181, 179, 177, 175,
+ 173, 171, 169, 167, 165, 163, 161, 159,
+ 157, 156, 155, 154, 153, 152, 151, 150,
+ 149, 148, 147, 146, 145, 144, 143, 142,
+ 142, 141, 141, 140, 140, 139, 139, 138,
+ 138, 137, 137, 136, 136, 135, 135, 134,
+ 134, 134, 133, 133, 133, 133, 132, 132,
+ 132, 132, 131, 131, 131, 131, 130, 130,
+ 130, 130, 130, 130, 129, 129, 129, 129,
+ 129, 129, 129, 129, 128, 128, 128, 128,
+};
+
+static unsigned char dsp_ulaw[] = {
+ 31, 31, 31, 32, 32, 32, 32, 33,
+ 33, 33, 33, 34, 34, 34, 34, 35,
+ 35, 35, 35, 36, 36, 36, 36, 37,
+ 37, 37, 37, 38, 38, 38, 38, 39,
+ 39, 39, 39, 40, 40, 40, 40, 41,
+ 41, 41, 41, 42, 42, 42, 42, 43,
+ 43, 43, 43, 44, 44, 44, 44, 45,
+ 45, 45, 45, 46, 46, 46, 46, 47,
+ 47, 47, 47, 48, 48, 49, 49, 50,
+ 50, 51, 51, 52, 52, 53, 53, 54,
+ 54, 55, 55, 56, 56, 57, 57, 58,
+ 58, 59, 59, 60, 60, 61, 61, 62,
+ 62, 63, 63, 64, 65, 66, 67, 68,
+ 69, 70, 71, 72, 73, 74, 75, 76,
+ 77, 78, 79, 81, 83, 85, 87, 89,
+ 91, 93, 95, 99, 103, 107, 111, 119,
+ 255, 247, 239, 235, 231, 227, 223, 221,
+ 219, 217, 215, 213, 211, 209, 207, 206,
+ 205, 204, 203, 202, 201, 200, 199, 198,
+ 197, 196, 195, 194, 193, 192, 191, 191,
+ 190, 190, 189, 189, 188, 188, 187, 187,
+ 186, 186, 185, 185, 184, 184, 183, 183,
+ 182, 182, 181, 181, 180, 180, 179, 179,
+ 178, 178, 177, 177, 176, 176, 175, 175,
+ 175, 175, 174, 174, 174, 174, 173, 173,
+ 173, 173, 172, 172, 172, 172, 171, 171,
+ 171, 171, 170, 170, 170, 170, 169, 169,
+ 169, 169, 168, 168, 168, 168, 167, 167,
+ 167, 167, 166, 166, 166, 166, 165, 165,
+ 165, 165, 164, 164, 164, 164, 163, 163,
+ 163, 163, 162, 162, 162, 162, 161, 161,
+ 161, 161, 160, 160, 160, 160, 159, 159,
+};