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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
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.

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200929084051epcas2p35fb2228ed1bdfce6a7ddf5b37c944823@epcas2p3.samsung.com>
2020-09-29  8:40 ` 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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