From: "Clemens Ladisch" <cladisch@fastmail.net>
To: Takashi Iwai <tiwai@suse.de>, Lennart Poettering <mznyfn@0pointer.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: Channel mapping
Date: Wed, 21 Nov 2007 16:17:41 +0100 [thread overview]
Message-ID: <1195658261.9272.1222564051@webmail.messagingengine.com> (raw)
In-Reply-To: <s5hr6ijhljj.wl%tiwai@suse.de>
Takashi Iwai wrote:
> Yes, querying channel mapping is another missing piece with popular
> demand.
>
> The implementation would be easy, I guess. But we have to define the
> way to inform this from kernel to user space: whether create a new
> ioctl or extend the existing ones (if possible)...
It's just metadata that describes a PCM device, so I think we should use
TLV for this.
The existing struct snd_ctl_tlv uses a single integer to identify
control elements. We could restrict control numid's to 31 bits and
use the upper bit to signal that this value includes device type and
device number in the lower bits, if we want to reuse the same TLV
ioctls.
Regards,
Clemens
next prev parent reply other threads:[~2007-11-21 15:17 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-20 0:51 [lennart@poettering.net: Status of ALSA "simple" mixer interface] Lennart Poettering
2007-11-21 11:09 ` Takashi Iwai
2007-11-21 11:11 ` Takashi Iwai
2007-11-21 15:23 ` Clemens Ladisch
2007-11-25 19:56 ` The sense or non-sense of the device listing API (was: Status of ALSA "simple" mixer interface]) Lennart Poettering
2007-11-25 20:38 ` Jaroslav Kysela
2007-11-21 11:14 ` Mono device definition Takashi Iwai
2007-11-21 11:20 ` Analog-SPDIF dup Takashi Iwai
2007-11-21 11:22 ` Softvol controls Takashi Iwai
2007-11-29 23:28 ` Lennart Poettering
2007-11-29 23:46 ` John Utz
2007-11-30 0:08 ` Lennart Poettering
2007-11-30 0:34 ` John Utz
2007-11-30 8:59 ` Takashi Iwai
2007-12-04 15:42 ` Jaroslav Kysela
2007-12-13 10:39 ` Takashi Iwai
2007-12-22 22:54 ` Lennart Poettering
2007-12-23 10:21 ` Jaroslav Kysela
2007-12-22 22:48 ` Lennart Poettering
2007-11-21 11:40 ` Disable conversions Takashi Iwai
2007-11-21 14:29 ` Takashi Iwai
2007-11-21 15:16 ` Jaroslav Kysela
2007-11-21 14:51 ` Takashi Iwai
2007-11-25 20:41 ` Lennart Poettering
2007-11-26 15:55 ` Jaroslav Kysela
2007-12-22 22:37 ` Lennart Poettering
2007-11-21 11:42 ` Channel mapping Takashi Iwai
2007-11-21 15:17 ` Clemens Ladisch [this message]
2007-11-21 14:57 ` Takashi Iwai
2007-11-21 15:27 ` Jaroslav Kysela
2007-11-21 15:04 ` Takashi Iwai
2007-11-27 16:54 ` Takashi Iwai
2007-11-21 15:52 ` Clemens Ladisch
2007-11-21 15:36 ` Takashi Iwai
2007-11-21 18:37 ` Jaroslav Kysela
2007-11-22 9:17 ` Clemens Ladisch
2007-11-22 8:55 ` Clemens Ladisch
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