Date: Mon, 17 Nov 1997 14:32:36 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: henrich@crh.cl.msu.edu (Charles Henrich) Cc: hasty@rah.star-gate.com, freebsd-multimedia@FreeBSD.ORG Subject: Re: ftp://rah.star-gate.com/pub/linux_ioctl-3.0-current.tar.gz Message-ID: <199711171332.OAA17030@labinfo.iet.unipi.it> In-Reply-To: <199711171404.JAA06681@crh.cl.msu.edu> from "Charles Henrich" at Nov 17, 97 09:04:29 am
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> >xquake and the linux real player 5.0 works over here with this version
> >of the linux layer.
>
> Any chance of a 2.2.5 version of these mods?
if you are only interested in raplayer, the fixes are quite trivial
(the relevant files are in /sys/i386/linux):
--- linux.h.orig Tue Dec 3 16:47:28 1996
+++ linux.h Mon Nov 17 00:05:29 1997
@@ -491,6 +491,9 @@
#define LINUX_SNDCTL_DSP_GETOSPACE 0x500C
#define LINUX_SNDCTL_DSP_GETISPACE 0x500D
#define LINUX_SNDCTL_DSP_NONBLOCK 0x500E
+#define LINUX_SNDCTL_DSP_GETCAPS 0x500F
+#define LINUX_SNDCTL_DSP_GETIPTR 0x5011
+#define LINUX_SNDCTL_DSP_GETOPTR 0x5012
#define LINUX_SOUND_MIXER_WRITE_VOLUME 0x4d00
#define LINUX_SOUND_MIXER_WRITE_BASS 0x4d01
#define LINUX_SOUND_MIXER_WRITE_TREBLE 0x4d02
--- linux_ioctl.c.orig Sat Nov 9 22:10:15 1996
+++ linux_ioctl.c Mon Nov 17 10:20:14 1997
@@ -691,6 +691,26 @@
args->cmd = SNDCTL_DSP_NONBLOCK;
return ioctl(p, (struct ioctl_args *)args, retval);
+ case LINUX_SNDCTL_DSP_GETCAPS:
+ args->cmd = SNDCTL_DSP_GETCAPS;
+ return ioctl(p, (struct ioctl_args *)args, retval);
+
+ case LINUX_SNDCTL_DSP_GETIPTR:
+ args->cmd = SNDCTL_DSP_GETIPTR;
+ return ioctl(p, (struct ioctl_args *)args, retval);
+
+ case LINUX_SNDCTL_DSP_GETOPTR:
+ args->cmd = SNDCTL_DSP_GETOPTR;
+ { int a= ioctl(p, (struct ioctl_args *)args, retval);
+ struct count_info *p = (struct count_info *)(args->arg);
+#if 0
+ p->bytes += 128 ; /* if the output sounds choppy... */
+ uprintf("GETOPTR bytes %d blk %d ptr %d\n",
+ p->bytes, p->blocks, p->ptr);
+#endif
+ return a;
+ }
+
case LINUX_SOUND_MIXER_WRITE_VOLUME:
args->cmd = SOUND_MIXER_WRITE_VOLUME;
return ioctl(p, (struct ioctl_args *)args, retval);
These changes more or less work with my audio driver (you need
support for a few more ioctl() which I have added just yesterday
and will make available later today).
I notice that rvplayer 5.0 with the sample file (welcome.rm) seems
to produce choppy audio output when the "synchronized" option is
set -- at least with my driver and my P5-133 at home (with a P6-200
things are much smoother). I am not sure if the same problem exists
with guspnp.
Unless I have misinterpreted the semantics of GETOPTR (which is
quite possible), i suspect the problem is that the application
(which seems to be using 128-byte buffers) leaves too little spare
data in the play buffer, which expires before rendering of the next
video frame has expired.
In case, the p->bytes += 128 is there to reduce the problem (it is a
dirty hack, i know...)
Cheers
Luigi
-----------------------------+--------------------------------------
Luigi Rizzo | Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it | Universita' di Pisa
tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/
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