Date: Fri, 29 Jan 1999 19:03:33 -0500 (EST) From: Luoqi Chen <luoqi@chen.ml.org> To: luoqi@chen.ml.org, tristan@mpegtv.com Cc: multimedia@FreeBSD.ORG Subject: Re: MpegTV volume control problem Message-ID: <199901300003.TAA01467@chen.ml.org> In-Reply-To: <36B20C6D.2B04BDC1@mpegtv.com>
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> > Luoqi Chen wrote: > > > > I'm having trouble adjusting volume while mtv is playing. No matter what > > value I set the volume to (either using mtv's volume control or using > > /usr/sbin/mixer), mtv immediately sets it back to 5:0. I had to remove > > the mixer node from /dev in order to hear the audio. I tried both Luigi's > > pcm driver and the old driver, same result. Did anybody else have the same > > experience? Is this a mpegtv bug or a problem with our system (either > > the sound driver or the linux emulation layer)? > > > > -lq > > it is not an mpegtv bug: volume control works well with all > the native linux versions > (linux-x86-libc5, linux-x86-glibc, linux-alpha...). > > note that after setting the volume, the player > asks (every second or so) the current > volume settings to the mixer with the OSS > ioctl call MIXER_READ(SOUND_MIXER_VOLUME) > or MIXER_READ(SOUND_MIXER_PCM). > > the player does that in order to reflect the current > volume setting, in case they are changed by some other source. > > If those ioctl do not work properly, mtv would behave > exactly has you describe. > > -t > It's a bug in our linux emulation layer, the direction bits of the ioctl word are ignored, so the read ioctls behaved exactly like the writes. I have included the fix in my read-raw-cd-data patch on http://www.freebsd.org/~luoqi. Tristan, you may add FreeBSD as another OS supported by mtv to play VCDs :) I intend to commit this patch as soon as it is reviewed. -lq To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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