From owner-freebsd-multimedia  Sun Aug  8 17:18:40 1999
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Date: Mon, 9 Aug 1999 01:16:56 +0100
Message-Id: <27264.199908090016@doyle.cogsci.ed.ac.uk>
From: Richard Tobin <richard@cogsci.ed.ac.uk>
Subject: Fxtv MPEG recording
To: multimedia@freebsd.org
Organization: just say no
Sender: owner-freebsd-multimedia@FreeBSD.ORG
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X-Loop: FreeBSD.org

I tried some MPEG recording from fxtv, and encountered a few minor
problems.  I was using fxtv-0.48 under FreeBSD 3.2-RELEASE.

(1) In tvaudio.c, after SNDCTL_DSP_SETFMT, the value is checked to see
    that it worked (parm != parm_new).  But the sound driver (snd/sound.c)
    has this code:

        /*
         * when some card (SB16) is opened RDONLY or WRONLY,
         * only one of the fields is set, the other becomes 0.
         * This makes it possible to select DMA channels at runtime.
         */

        if (d->play_fmt)
            d->play_fmt = *(int *)arg ;
        if (d->rec_fmt)
            d->rec_fmt = *(int *)arg ;
        splx(s);
        if (ask_init(d))
            *(int *)arg = d->play_fmt ;

    So when setting the record format, the returned value is the play
    format, which is zero (as suggested in the comment), so fxtv thinks
    the ioctl sample format is not supported.  The driver code looks
    bogus to me, but I just hacked fxtv to not check.

(2) The fxtv README says that mplex is not used by fxtv, but it is.

(3) The fxtv README mentions an envoronment variable MPEG_AUDIO for
    dist10, but it's really MPEGTABLES.

Apart from these problems, I was very impressed with how well it worked.

-- Richard



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