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[Openvortex-dev] Re: Volume per voices [Feature Request]

From: Raymond
Subject: [Openvortex-dev] Re: Volume per voices [Feature Request]
Date: Fri, 05 Aug 2005 18:23:20 +0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.7.8) Gecko/20050603 Fedora/1.7.8-1.1.1.legacy

Takashi Iwai wrote:
At Mon, 01 Aug 2005 00:37:26 +0800,
Raymond wrote:

Jaroslav Kysela wrote:

On Thu, 28 Jul 2005, Raymond wrote:

In theory, and sound cards with hardware mixing can support this kind of
volume control.

Nope. Please, define the controls at the driver initialization phase and make them inactive when the stream is not open. See emu10k1 or trident driver for hints. You must also map the voice volume with substream number.

Beside volume control, Is it feasible to bind other controls (e.g.
Interaural Time Difference, Interaural Level Difference and SAMPLE RATE CONVERTOR - Doppler Effect ) to the substream ?

I think yes.  Whatever directly bound to a PCM substream should be
handled as IFACE_PCM with a certain subdevice number.

It's OK for au88x0 to use a sample rate different from that of PCM stream play the PCM stream to produce a different pitch.

Does the alsa-lib really allow using a kcontrol to change the sample rate while playing the PCM to produce the Doppler Effect ?

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