From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Alexander E. Patrakov" <patrakov@gmail.com>
Subject: Re: Master Plan on rewinding
Date: Sat, 13 Sep 2014 16:43:26 +0600
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To: Raymond Yau <superquad.vortex2@gmail.com>
Cc: Takashi Iwai <tiwai@suse.de>, ALSA Development Mailing List <alsa-devel@alsa-project.org>, David Henningsson <david.henningsson@canonical.com>, Takashi Sakamoto <o-takashi@sakamocchi.jp>
List-Id: alsa-devel@alsa-project.org

13.09.2014 14:57, Raymond Yau wrote:
>
>  >>
>  >>  >
>  >>  > On my desktop PC, on snd-hda-intel with analog outputs for S16LE
>  >> stereo, the granularity is 32 bytes (= 8 samples), and I get the pointer
>  >> granularity of 64 bytes (=16 samples) over HDMI. The minimum period size
>  >> is 32 samples in both cases.
>  >>
>  >> Do you mean hda-Intel does not support arbritray period size when you
>  >> say the granularity is 32 bytes ?
>  >>
>  >> However the granularity of the emulated hda sound card inside any VM
>  >> depend on the vm and the backend audio system and sound card
>  >
>  >
>  > The precise meaning is defined here:
>  >
>  > http://mailman.alsa-project.org/pipermail/alsa-devel/2014-May/076475.html
>
> Do you mean the different hda controllers may have different granularity ?

Yes. My two hda controllers have different granularity.

> Do your two hda controllers have different Fifo size ?

If you mean the result of snd_pcm_hw_params_get_fifo_size(), then both 
cards return 0. I call this function after snd_pcm_hw_params(), as 
recommended by the documentation.

-- 
Alexander E. Patrakov