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Date:      Fri, 4 Oct 2024 22:57:17 +0200
From:      Alfonso Sabato Siciliano <alfix86@gmail.com>
To:        multimedia@freebsd.org
Subject:   New meaning oss_sysinfo.nummixers
Message-ID:  <CAPJrGM0-ptpwZg8nB1MMJhbUr2tMuTG=Tnagce8UXQJjp2nDyw@mail.gmail.com>
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[-- Attachment #1 --]
Hi guys!

I was inactive for months, one week ago I reinstalled CURRENT on my main
laptop (and others). The meaning of "struct oss_sysinfo.nummixers"
changed. Let's say:

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

int main()
{
        int fd;
        struct oss_sysinfo si;
const char *mixer="/dev/mixer0"; //or your mixer

        if ((fd = open(mixer, O_RDWR)) == -1) {
                printf("Error open()\n");
                return (-1);
        }

        if (ioctl(fd, SNDCTL_SYSINFO, &si) == -1) {
                printf("Error SNDCTL_SYSINFO\n");
                return (-1);
        }

        close(fd);
        printf("nummixers: %d\n", si.nummixers);
        return (0);
}

Output "nummixers: 7", But

% sysctl dev.pcm
... prints 6 devices dev.pcm.[0-5].*

% ls /dev/mixer*
/dev/mixer0 /dev/mixer1 /dev/mixer2 /dev/mixer3 /dev/mixer4 /dev/mixer5

6 mixers from 0 to 5. But now oss_sysinfo.nummixers is 7, it was 6 until
some months ago.

I thought the new value could be the max index, in the case some mixers
are closed, example /dev/mixer0 /dev/mixer2 /dev/mixer5. But in this
case 'nummixers' should be 5 not 7.

Maybe the hidden /dev/mixer is in the count (6 + 1 = 7).

Same situation on 3 laptops. So, what is the new meaning for
oss_sysinfo.nummixers?

Thank you in advance for any reply (now I am working/busy on another
subsystem, I hope to look at audio(4) again in the future).

Best regards,
Alfonso

[-- Attachment #2 --]
<div dir="ltr">Hi guys!<br><br>I was inactive for months, one week ago I reinstalled CURRENT on my main<br>laptop (and others). The meaning of &quot;struct oss_sysinfo.nummixers&quot;<br>changed. Let&#39;s say:<br><br>#include &lt;sys/soundcard.h&gt;<br>#include &lt;fcntl.h&gt;<br>#include &lt;stdio.h&gt;<br>#include &lt;unistd.h&gt;<br><br>int main()<br>{<br>        int fd;<br>        struct oss_sysinfo si;<br>	const char *mixer=&quot;/dev/mixer0&quot;; //or your mixer<br><br>        if ((fd = open(mixer, O_RDWR)) == -1) {<br>                printf(&quot;Error open()\n&quot;);<br>                return (-1);<br>        }<br><br>        if (ioctl(fd, SNDCTL_SYSINFO, &amp;si) == -1) {<br>                printf(&quot;Error SNDCTL_SYSINFO\n&quot;);<br>                return (-1);<br>        }<br><br>        close(fd);<br>        printf(&quot;nummixers: %d\n&quot;, si.nummixers);<br>        return (0);<br>}<br><br>Output &quot;nummixers: 7&quot;, But<br><br>% sysctl dev.pcm<br>... prints 6 devices dev.pcm.[0-5].*<br><br>% ls /dev/mixer*<br>/dev/mixer0 /dev/mixer1 /dev/mixer2 /dev/mixer3 /dev/mixer4 /dev/mixer5<br><br>6 mixers from 0 to 5. But now oss_sysinfo.nummixers is 7, it was 6 until<br>some months ago.<br><br><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">I thought </span></span></span>the new value could be the max index, in the case some mixers<br>are closed, example /dev/mixer0 /dev/mixer2 /dev/mixer5. But in this<br>case &#39;nummixers&#39; should be 5 not 7.<br><br>Maybe the hidden /dev/mixer is in the count (6 + 1 = 7).<br><br>Same situation on 3 laptops. So, what is the new meaning for<br>oss_sysinfo.nummixers?<br><br>Thank you in advance for any reply (now I am working/busy on another <br>subsystem, I hope to look at audio(4) again in the future).<br><br>Best regards,<br>Alfonso<br></div>
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