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SubjectSound recording problems
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Date
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!
// 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);
}
}
}
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