From: Clemens Ladisch <clemens@ladisch.de>
To: "Harsha, Priya" <priya.harsha@intel.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
Lee Revell <rlrevell@joe-job.com>
Subject: Re: question on hardware mixing
Date: Tue, 09 Dec 2008 09:52:51 +0100 [thread overview]
Message-ID: <493E31E3.2080504@ladisch.de> (raw)
In-Reply-To: <98769532B4BB14429434178695419EAE268614A1@bgsmsx501.gar.corp.intel.com>
Harsha, Priya wrote:
> In the trigger function - I see that from substream->runtime->private_data,
> voice specific parameters are extracted. How and can somehow user space
> fill in some private data to the driver so that driver can process voice
> in a different way and music in a different way?
On the Emu10k1 chip, the hardware voices are used for both PCM playback
and wavetable (MIDI) playback. Voice-specific parameters are set for
MIDI data; the parameters come from the soundfont that was loaded to
specify how the instruments sound. (Here, the term "voice" has no
relation to the sound of a human voice.)
As far as PCM playback is concerned, ALSA does not have any predefined
mechanism to differentiate between voice and music audio streams. It
would be possible to define mixer controls to switch between these
settings for each substream.
HTH
Clemens
next prev parent reply other threads:[~2008-12-09 8:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-05 16:53 [PATCH 0/2] ASoC updates Mark Brown
2008-12-05 16:54 ` [PATCH 1/2] ASoC: Add support for OMAP3 Pandora Mark Brown
2008-12-05 16:54 ` [PATCH 2/2] ASoC: tlv320aic3x: control additions and cleanups Mark Brown
2008-12-05 17:03 ` question on hardware mixing Harsha, Priya
2008-12-05 17:12 ` Vedran Miletić
2008-12-05 17:26 ` Harsha, Priya
2008-12-06 4:58 ` Lee Revell
2008-12-06 6:56 ` Harsha, Priya
2008-12-09 3:15 ` Lee Revell
2008-12-09 3:24 ` Harsha, Priya
2008-12-09 3:26 ` Harsha, Priya
2008-12-09 8:52 ` Clemens Ladisch [this message]
2008-12-09 8:55 ` Harsha, Priya
2008-12-09 12:44 ` David Dillow
2009-04-09 7:36 ` question on hardware Harsha, Priya
2009-04-09 7:56 ` Harsha, Priya
2009-04-17 13:36 ` Takashi Iwai
2008-12-09 14:06 ` question on hardware mixing Clemens Ladisch
2008-12-09 17:04 ` Harsha, Priya
2009-05-07 14:35 ` Harsha, Priya
2008-12-05 17:09 ` [PATCH 0/2] ASoC updates Takashi Iwai
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