From: Tanu Kaskinen <tanuk@iki.fi>
To: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: [RFC] Channel mapping API (take 2)
Date: Wed, 05 Sep 2012 09:00:12 +0300 [thread overview]
Message-ID: <1346824812.3629.29.camel@laptop> (raw)
In-Reply-To: <s5hhard23jb.wl%tiwai@suse.de>
On Tue, 2012-09-04 at 17:47 +0200, Takashi Iwai wrote:
> The rest aren't so much changed. Only slight bug fixes.
I have a couple of comments about "the rest". I haven't been following
the development of the channel map API very closely, so I'm relying on
the pcm.h file only.
/** channel map list type */
enum snd_pcm_chmap_type {
SND_CHMAP_NONE = 0, /** unspecified channel position */
SND_CHMAP_FIXED, /** fixed channel position */
SND_CHMAP_VAR, /** freely swappable channel position */
SND_CHMAP_PAIRED, /** pair-wise swappable channel position */
};
It's not clear to me what the VAR and PAIRED types actually mean. It
would be nice to explain in more detail the concepts in the header.
The snd_pcm_chmap_position enum doesn't contain an entry for mono. I
think it would be a useful channel to have. Up/downmixing decisions may
be different with mono than, for example, a single channel declared as
front left.
--
Tanu
next prev parent reply other threads:[~2012-09-05 6:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 15:47 [RFC] Channel mapping API (take 2) Takashi Iwai
2012-09-05 6:00 ` Tanu Kaskinen [this message]
2012-09-05 6:17 ` Takashi Iwai
2012-09-05 6:38 ` Tanu Kaskinen
2012-09-05 6:49 ` David Henningsson
2012-09-05 6:59 ` Takashi Iwai
2012-09-05 8:32 ` David Henningsson
2012-09-05 10:34 ` Takashi Iwai
2012-09-06 11:47 ` Raymond Yau
2012-09-06 11:56 ` Takashi Iwai
2012-09-07 9:16 ` Tanu Kaskinen
2012-09-07 9:43 ` Takashi Iwai
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