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From: "Gyeongtaek Lee" <gt82.lee@samsung.com>
To: "'Takashi Iwai'" <tiwai@suse.de>
Cc: 'Pierre-Louis Bossart' <pierre-louis.bossart@linux.intel.com>,
	alsa-devel@alsa-project.org, khw0178.kim@samsung.com,
	kimty@samsung.com, tiwai@suse.com, lgirdwood@gmail.com,
	'Vinod Koul' <vkoul@kernel.org>,
	hmseo@samsung.com, s47.kang@samsung.com, pilsun.jang@samsung.com,
	tkjung@samsung.com
Subject: RE: [PATCH] ALSA: compress: allow pause and resume during draining
Date: Tue, 27 Oct 2020 10:56:19 +0900
Message-ID: <000401d6ac04$5cf67270$16e35750$@samsung.com> (raw)
In-Reply-To: <s5h5z6w53bm.wl-tiwai@suse.de>

On Mon, 26 Oct 2020 18:01:33 +0100, Takashi Iwai wrote:
>On Mon, 26 Oct 2020 10:18:38 +0100,
>Gyeongtaek Lee wrote:
>> 
>> With a stream with low bitrate, user can't pause or resume the stream
>> near the end of the stream because current ALSA doesn't allow it.
>> If the stream has very low bitrate enough to store whole stream into
>> the buffer, user can't do anything except stop the stream and then
>> restart it from the first because most of applications call draining
>> after sending last frame to the kernel.
>> If pause, resume are allowed during draining, user experience can be
>> enhanced.
>> To prevent malfunction in HW drivers which don't support pause
>> during draining, pause during draining will only work if HW driver
>> enable this feature explicitly by calling
>> snd_compr_use_pause_in_draining().
>> 
>> Signed-off-by: Gyeongtaek Lee <gt82.lee@samsung.com>
>> Cc: stable@vger.kernel.org
>
>Could you restart the new thread?  It's been hanging too deeply and
>hard to read through.
>
>Since it's the revised patch, please give the revision number (v2 or
>such) and show what's different from the previous patches.
>
Ok. I'll send the patch again with [PATCH v2] prefix.
>About the changes:
>
>> +/**
>> + * snd_compr_use_pause_in_draining - Allow pause and resume in draining state
>> + * @substream: compress substream to set
>> + *
>> + * Allow pause and resume in draining state.
>> + * Only HW driver supports this transition can call this API.
>> + */
>> +static inline void snd_compr_use_pause_in_draining(
>> +					struct snd_compr_stream *substream)
>> +{
>> +	substream->device->use_pause_in_draining = true;
>> +}
>
>How to set the flag is an open question.  A natural way would be to
>set it somehow at creating the component object, but currently there
>seems no way to pass any flags.
Could you explain more about what is your concerning?
For me, calling snd_compr_use_pause_in_draining() in open() callback of 
snd_compr_ops was good enough.
I've tested it and it worked well on linux 5.4.
>
>
>thanks,
>
>Takashi
>


  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
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 [this message]
     [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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