From: Takashi Iwai <tiwai@suse.de>
To: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: [PATCH 2/2] ALSA: pcm: auto-fill buffer with silence when draining playback
Date: Wed, 12 Apr 2023 12:37:56 +0200 [thread overview]
Message-ID: <87wn2ho06z.wl-tiwai@suse.de> (raw)
In-Reply-To: <ZDZmDyOMYMD4Uu5g@ugly>
On Wed, 12 Apr 2023 10:04:31 +0200,
Oswald Buddenhagen wrote:
>
> On Wed, Apr 12, 2023 at 09:54:54AM +0200, Takashi Iwai wrote:
> > I'm thinking whether we need to change anything in the kernel side for
> > this at all. Can't it be changed rather in alsa-lib side instead?
> >
> it could, but it would be a lot uglier. user space would have to do a
> "man-in-the-middle attack" on the data, while in the kernel we can
> just slightly modify the consumer. this would be particularly obvious
> in the case of write() access.
But basically it'd be like fiddling sw_params temporarily for
draining, I suppose? And the "attack" here can be taken too
seriously; the whole PCM operation can be somehow interfered if a
process may have the access to the PCM device, and changing sw_params
itself must not introduce too much trouble.
thanks,
Takashi
next prev parent reply other threads:[~2023-04-12 10:39 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-05 20:12 [PATCH 1/2] ALSA: pcm: rewrite snd_pcm_playback_silence() Oswald Buddenhagen
2023-04-05 20:12 ` [PATCH 2/2] ALSA: pcm: auto-fill buffer with silence when draining playback Oswald Buddenhagen
2023-04-07 23:58 ` Jaroslav Kysela
2023-04-08 5:55 ` Takashi Iwai
2023-04-08 7:24 ` Oswald Buddenhagen
2023-04-11 11:09 ` Jaroslav Kysela
2023-04-11 13:57 ` Oswald Buddenhagen
2023-04-11 14:48 ` Jaroslav Kysela
2023-04-11 16:50 ` Oswald Buddenhagen
2023-04-11 17:23 ` Jaroslav Kysela
2023-04-12 7:54 ` Takashi Iwai
2023-04-12 8:04 ` Oswald Buddenhagen
2023-04-12 10:37 ` Takashi Iwai [this message]
2023-04-12 11:38 ` Oswald Buddenhagen
2023-04-12 19:59 ` Jaroslav Kysela
2023-04-13 5:42 ` Takashi Iwai
2023-04-13 10:16 ` Oswald Buddenhagen
2023-04-13 10:28 ` Takashi Iwai
2023-04-13 11:10 ` Oswald Buddenhagen
2023-04-13 12:06 ` Takashi Iwai
2023-04-13 14:59 ` Oswald Buddenhagen
2023-04-14 8:26 ` Takashi Iwai
2023-04-14 8:56 ` Oswald Buddenhagen
2023-04-14 9:28 ` Takashi Iwai
2023-04-06 14:53 ` [PATCH 1/2] ALSA: pcm: rewrite snd_pcm_playback_silence() Takashi Iwai
2023-04-11 10:47 ` Jaroslav Kysela
2023-04-12 10:33 ` Oswald Buddenhagen
2023-04-12 19:23 ` Jaroslav Kysela
2023-04-13 9:44 ` Oswald Buddenhagen
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