From: Pablo Baena <pbaena@uol.com.ar>
To: linux-kernel@vger.kernel.org
Subject: Sound recording problems
Date: 25 Jul 2003 18:48:19 +0000 [thread overview]
Message-ID: <1059158899.1116.29.camel@hal> (raw)
[-- Attachment #1: Type: text/plain, Size: 987 bytes --]
Hi! I tried the linux-sound list without luck, so I try this list. I'm
having recording troubles with my computer. I say my computer, because
I've already tried 3 different sound cards, and 2 kernels, with strange
results.
I'll focus on my actual configuration, so I can debug the problem. I
have a SB16 Awe ISA, and I tried the OSS drivers with 2.6.0-test1.
I have a VIAC686 motherboard, with a K7 650Mhz processor.
The sample program I attach, do record the sound. Please notice the
commented snip that doesn't work, it is stopping a lot of programs from
working.
Also, if I try doing a
cat /dev/dsp > bla.raw
the result file is full of 7F's (doesn't hear anything).
This is just a sample of the problems I have with lots of other
recording programs.
Can you help me debug this? What should I do? What information should I
reunite?
Please reply to my own address, since I'm not subscribed to the list.
TIA!!
--
Whip it, baby. Whip it right. Whip it, baby. Whip it all night!
[-- Attachment #2: nrec.c --]
[-- Type: text/x-c, Size: 2426 bytes --]
// Stolen from nuvrec: http://mars.tuwien.ac.at/~roman/nuppelvideo/
#include <sys/soundcard.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <signal.h>
int ostr=0;
long audio_buffer_size=0;
static void sighandler(int i)
{
if (ostr) {
close(ostr);
}
printf ("\n");
exit(0);
}
int main (int argc, char** argv) {
int afmt, afd, frag, channels, rate, blocksize, trigger, lastread;
char audiodevice[] = "/dev/dsp";
unsigned char* buffer;
ostr=open(argv[1],O_WRONLY|O_CREAT, 0644);
if (ostr==-1) return(-1);
if (-1 == (afd = open(audiodevice, O_RDONLY))) {
fprintf(stderr, "\n%s\n", "Cannot open DSP, exiting");
exit(1);
}
signal(SIGINT, sighandler); // install sighaendler
ioctl(afd, SNDCTL_DSP_RESET, 0);
frag=(8<<16)|(10);//8 buffers, 1024 bytes each
ioctl(afd, SNDCTL_DSP_SETFRAGMENT, &frag);
afmt = AFMT_S16_LE;
ioctl(afd, SNDCTL_DSP_SETFMT, &afmt);
if (afmt != AFMT_S16_LE) {
fprintf(stderr, "\n%s\n", "Can't get 16 bit DSP, exiting");
exit;
}
channels = 2;
ioctl(afd, SNDCTL_DSP_CHANNELS, &channels);
// sample rate
rate = 44100;
ioctl(afd, SNDCTL_DSP_SPEED, &rate);
if (-1 == ioctl(afd, SNDCTL_DSP_GETBLKSIZE, &blocksize)) {
fprintf(stderr, "\n%s\n", "Can't get DSP blocksize, exiting");
exit;
}
blocksize*=4; // allways read 4*blocksize
audio_buffer_size = blocksize;
// This doesn't work!! Throws: Resource temporarily unavailable!
// when reading.
// trigger record
trigger = ~PCM_ENABLE_INPUT;
ioctl(afd,SNDCTL_DSP_SETTRIGGER,&trigger);
trigger = PCM_ENABLE_INPUT;
ioctl(afd,SNDCTL_DSP_SETTRIGGER,&trigger);
//
buffer = (char *)malloc(audio_buffer_size);
while(1) {
if (audio_buffer_size != (lastread = read(afd,buffer,audio_buffer_size)))
{
fprintf(stderr, "only read %d from %ld bytes from '%s'\n", lastread, audio_buffer_size,
audiodevice);
perror("read /dev*audiodevice");
if (lastread == -1)
exit (1);
}
else {
fprintf(stderr, ".");
write(ostr, buffer, audio_buffer_size);
}
}
}
next reply other threads:[~2003-07-25 21:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-25 18:48 Pablo Baena [this message]
2003-07-25 23:43 ` Sound recording problems Alan Cox
2003-07-26 14:42 ` Pablo Baena
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1059158899.1116.29.camel@hal \
--to=pbaena@uol.com.ar \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).