linux-kernel - Re: [PATCH 2/3] ALSA: compress: document the compress gapless audio state machine

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Message-ID: <20200622053441.GE2324254@vkoul-mobl>
Date:   Mon, 22 Jun 2020 11:04:41 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ALSA: compress: document the compress gapless audio
 state machine

On 19-06-20, 09:27, Pierre-Louis Bossart wrote:
> 
> > +For Gapless, we move from running state to partial drain and back, along
> > +with setting of meta_data and signalling for next track ::
> > +
> > +
> > +                                        +----------+
> > +                compr_drain_notify()    |          |
> > +              +------------------------>|  RUNNING |
> > +              |                         |          |
> > +              |                         +----------+
> > +              |                              |
> > +              |                              |
> > +              |                              | compr_next_track()
> > +              |                              |
> > +              |                              V
> > +              |                         +----------+
> > +              |                         |          |
> > +              |                         |NEXT_TRACK|
> > +              |                         |          |
> > +              |                         +----------+
> > +              |                              |
> > +              |                              |
> > +              |                              | compr_partial_drain()
> > +              |                              |
> > +              |                              V
> > +              |                         +----------+
> > +              |                         |          |
> > +              +------------------------ | PARTIAL_ |
> > +                                        |  DRAIN   |
> > +                                        +----------+
> 
> May I suggest having a single state machine, not a big one and an additional
> partial one. It would help explain why in one case compr_drain_notify()
> triggers a transition to RUNNING while in the other one it goes to SETUP.
> 
> I realize it's more complicated to edit but it'd be easier on
> reviewers/users.

Ell adding stop and transitions would really make it complicated and
gapless is a bit different handling and it looks cleaner this way IMO,
so lets stick to this. Feel free to create one if you are up for it.

-- 
~Vinod