From owner-freebsd-multimedia  Mon Nov  6 17:36:12 2000
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From: Andrew Gordon <arg@arg1.demon.co.uk>
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To: j mckitrick <jcm@FreeBSD-uk.eu.org>
Cc: stable@freebsd.org, multimedia@freebsd.org
Subject: Re: continuing sound problems with 4.2-beta
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On Sat, 4 Nov 2000, j mckitrick wrote:

> I continue to get 'invalid argument' when using 'play' to play a .wav file.
> Maybe I am doing something wrong, but I can't figure out what it is.
> 
> open("/dev/dsp",1,027757774234)                  = 4 (0x4)
> ioctl(4,SNDCTL_DSP_GETBLKSIZE,0xbfbff7d4)        = 0 (0x0)
> ioctl(4,SNDCTL_DSP_SETFMT,0x804bc80)             ERR#22 'Invalid argument'

I ran into this the other day; it appears that there has been a change in
the sound API recently such that you need to do SNDCTL_DSP_SPEED before
SNDCTL_DSP_SETFMT.  I haven't had time to dig into CVS to see when this
happened or why.

This code used to work in 3.x and in 4.x up until a week or two ago:

    audio_fd = open("/dev/audio", O_RDWR);
    if (audio_fd < 0)
    {
        perror("/dev/audio");
        exit(1);
    }
    i = AFMT_S16_LE;
    if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &i) == -1)
    {
        perror("Setting audio format");
        exit(1);
    }
    i = 1;
    if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &i) == -1)
    {
        perror("Setting stereo mode");
        exit(1);
    }
    i = SAMPLE_HZ;
    if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &i) == -1)
    {
        perror("Setting audio rate");
        exit(1);
    }
    if (i != SAMPLE_HZ)
    {
        fprintf(stderr, "Soundcard doesn't support %dHz (offers %d)\n",
            SAMPLE_HZ, i);
        exit(1);
    }


Now, it fails at the SNDCTL_DSP_SETFMT call (invalid argument), but if I
move the SNDCTL_DSP_SETSPEED immediately after the open, normal working is
restored.



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