From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Vinod Koul <vkoul@kernel.org>, Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org, khw0178.kim@samsung.com,
kimty@samsung.com, s47.kang@samsung.com, lgirdwood@gmail.com,
tiwai@suse.com, hmseo@samsung.com,
Gyeongtaek Lee <gt82.lee@samsung.com>,
pilsun.jang@samsung.com, tkjung@samsung.com
Subject: Re: [PATCH] ALSA: compress: allow pause and resume during draining
Date: Thu, 1 Oct 2020 10:28:15 -0500 [thread overview]
Message-ID: <2bf52360-bd11-b4cd-b255-8a5610b4aa5f@linux.intel.com> (raw)
In-Reply-To: <20201001102938.GU2968@vkoul-mobl>
>>>> Hrm, this resulted in rather more complex changes than the original
>>>> patch. It shows that introducing yet another state is no good idea
>>>> for this particular case.
>>>>
>>>> Since the possible application's behavior after this pause is as same
>>>> as the normal pause (i.e. either resuming pause or dropping), I find
>>>> it OK to take the original approach.
>>> Thank you for the review.
>>> I think that I should resend the original patch.
>>
>> Let's wait a bit for other opinions. We may add rather a new flag
>> instead of introducing a new state, too, for example.
>
> I was out for a week, back now ;-)
>
> So bigger question is if kernel should handle this change or we ask
> userspace to handle this. Userland knows that bit rate is less so small
> buffer can be for longer duration so instead of sending dumb X bytes,
> should it not scale the buffer based on bit rate?
what about variable bit-rate? or cases where you have a 'bit reservoir'
in previous frames?
You really cannot in general translate bytes to time with compressed
data, which is the reason we introduced the API in the first place...
Userspace *may* know the duration for specific formats or based on
metadata, but in some cases the only way to know is actually to decode
the data.
I suggest we keep the compressed API based on bytes and non-periodic
events when the bytes were consumed/generated.
next prev parent reply other threads:[~2020-10-01 16:26 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200929084051epcas2p35fb2228ed1bdfce6a7ddf5b37c944823@epcas2p3.samsung.com>
2020-09-29 8:40 ` [PATCH] ALSA: compress: allow pause and resume during draining Gyeongtaek Lee
2020-09-29 8:54 ` Takashi Iwai
2020-09-29 9:17 ` Gyeongtaek Lee
2020-09-29 14:00 ` Pierre-Louis Bossart
2020-10-01 10:29 ` Vinod Koul
2020-10-01 15:28 ` Pierre-Louis Bossart [this message]
2020-10-06 6:21 ` Vinod Koul
2020-10-06 14:57 ` Pierre-Louis Bossart
2020-10-08 9:49 ` Gyeongtaek Lee
2020-10-09 15:13 ` Takashi Iwai
2020-10-09 17:43 ` Jaroslav Kysela
2020-10-10 9:08 ` Takashi Iwai
2020-10-12 5:25 ` Vinod Koul
2020-10-12 7:01 ` Takashi Iwai
2020-10-12 12:24 ` Vinod Koul
2020-10-12 13:29 ` Jaroslav Kysela
2020-10-12 13:55 ` Vinod Koul
2020-10-12 14:10 ` Jaroslav Kysela
2020-10-12 14:21 ` Takashi Iwai
2020-10-12 14:46 ` Jaroslav Kysela
2020-10-12 14:59 ` Takashi Iwai
2020-10-15 10:47 ` Gyeongtaek Lee
2020-10-20 5:23 ` Gyeongtaek Lee
2020-10-26 9:18 ` Gyeongtaek Lee
2020-10-26 17:01 ` Takashi Iwai
2020-10-27 1:56 ` Gyeongtaek Lee
[not found] <CGME20200928105009epcas2p4a65d50d9d09800281395a490d1844ef3@epcas2p4.samsung.com>
2020-09-28 10:50 ` Gyeongtaek Lee
2020-09-28 11:13 ` Jaroslav Kysela
2020-09-28 14:34 ` Pierre-Louis Bossart
2020-09-29 1:51 ` Gyeongtaek Lee
2020-09-29 7:12 ` Takashi Iwai
2020-09-29 17:27 ` Jaroslav Kysela
2020-09-30 9:35 ` Takashi Iwai
2020-09-30 9:57 ` Jaroslav Kysela
2020-09-30 10:33 ` Takashi Iwai
2020-09-30 11:23 ` Jaroslav Kysela
2020-10-01 10:35 ` Vinod Koul
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