From owner-freebsd-current  Thu Feb 17  2:12:37 2000
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From: "Thimble Smith" <tim@mysql.com>
Date: Thu, 17 Feb 2000 05:11:51 -0500
To: current@freebsd.org
Subject: ViBRA16X and /dev/dsp
Message-ID: <20000217051151.T2611@threads.polyesthetic.msg>
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Hi.  I'm still trying to figure out why /dev/dsp isn't working with
my ViBRA16X card.  I wrote a little program to test the device.  The
trouble is, I don't know what I'm doing and have not found much in
the way of documentation.  I'm hoping someone can give me a hint, so
I can figure out what's going wrong.

If I'm way off topic and just annoying everyone, please let me know
and I'll just shut up until either I learn more or someone else deals
with it.  :)

Being optimistic, here's my program:


#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define BUFSZ 1024

int
main()
{
    int audio_fd;
    unsigned char audio_buf[BUFSZ];
    int format = AFMT_U8;
    int speed = 8000;
    ssize_t written;

    if ((audio_fd = open("/dev/dsp", O_WRONLY, 0)) == -1) {
        perror("/dev/dsp");
        exit(EXIT_FAILURE);
    }

    if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format) == -1) {
        perror("SETFMT");
        exit(EXIT_FAILURE);
    }

    if (format != AFMT_U8) {
        fprintf(stderr, "AFMT_U8 is unsupported (try 0x%02x)\n", format);
        exit(EXIT_FAILURE);
    }

    if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &speed) == -1) {
        perror("SPEED");
        exit(EXIT_FAILURE);
    }

    if (speed != 8000)
        fprintf(stderr, "warning: speed == %d\n", speed);

    /* let's give this a shot! */
    /* OK, so this doesn't seem to be doing what I want - I'm trying to
       just play some tone - anything - to test if the thing is working
       or not.  I was hoping this simple thing might be close enough to
       a sound file that it would play something.  But obviously I'm
       being naive.

       What should I put into the buffer to get it to play?  Do I need
       to write the buffer many times to the device in order to hear
       anything? */

    memset(audio_buf, 0xaa, BUFSZ);

    fprintf(stderr, "getting ready to write to the device\n");

    written = write(audio_fd, audio_buf, BUFSZ);
    if (written != BUFSZ)
        fprintf(stderr, "only wrote %d of %d bytes\n", written, BUFSZ);

    fprintf(stderr, "getting ready to close the device\n");

    close(audio_fd);

    fprintf(stderr, "Done.\n");

    return EXIT_SUCCESS;
}

When I run the program, I hear a pop; just as if I'd done
$ echo "foo" > /dev/dsp; but I hear nothing that sounds like a tone.
There are no warnings printed, though.

Thanks for any help,

Tim


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