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Re: kern/54229: audio in firefox stops playing
The following reply was made to PR kern/54229; it has been noted by GNATS.
From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Cc: coypu%sdf.org@localhost, tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/54229: audio in firefox stops playing
Date: Sun, 2 Jun 2019 03:06:22 +0900
> > please don't remove this feature.
> > i've used it infrequently over the years and i'm fairly sure i have
> > at least one script that relies upon it (even though they could be
> > rewritten.)
> In the name of "backwards compatibility" we'll have to change every
> single program using OSS audio in pkgsrc not to use /dev/sound.
> If someone keeps using an old program they'll have unexpected behaviour.
> That is the opposite result from the intention of backwards
> compatibility: old code works without modification.
What behavior and/or which version's behavior are you trying to
According to analysis by isaki-san, the firefox problem also
happens on 8.99.37 and NetBSD 8.x (i.e. pre isaki-audio2 merge):
>> 1. boot any of
>> * NetBSD 8 or
>> * -current before merging isaki-audio2 (<8.99.39) or
>> * -current after merging isaki-audio2 (>=8.99.39).
>> (I think NetBSD7 is the same but I haven't confirmed)
>> 2. audioctl -d /dev/sound -w play.pause=1
>> 3. execute firefox and play something on youtube.
>> -> firefox cannot play video.
On "3.", firefox reopen /dev/sound, as a device for OSS.
Then the pause state (in AUDIO_SETINFO) set on "2." is
kept and valid at "3.", per defined behavior of /dev/sound
as mentioned in audio(4):
>> When /dev/sound is opened, it maintains the audio format
>> and pause/unpause state of the most recently opened track.
>> In all other respects /dev/audio and /dev/sound are identical.
That's what isaki-san pointed out:
>> Unless firefox expects that it stops by external operation, I think
>> that using /dev/sound in firefox is a bug, although I'm not sure
>> about pkgsrc/www/firefox history.
I guess the problem did not arise on NetBSD 7.x and prior
by chance because other program could not open /dev/sound
if firefox already opened it.
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