forked from pool/alsa-utils
80 lines
2.3 KiB
Diff
80 lines
2.3 KiB
Diff
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From 8824d0824d780d0fa503f9c9fbae46e45bbb18e7 Mon Sep 17 00:00:00 2001
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From: Takashi Iwai <tiwai@suse.de>
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Date: Mon, 19 Mar 2012 16:03:33 +0100
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Subject: [PATCH 08/13] amixer, alsamixer: Add description of volume-mapping
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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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---
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alsamixer/alsamixer.1 | 13 +++++++++++++
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amixer/amixer.1 | 17 +++++++++++++++++
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2 files changed, 30 insertions(+)
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diff --git a/alsamixer/alsamixer.1 b/alsamixer/alsamixer.1
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index cd88404..8d34680 100644
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--- a/alsamixer/alsamixer.1
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+++ b/alsamixer/alsamixer.1
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@@ -157,6 +157,19 @@ Quit the program with \fIALT Q\fP, or by hitting \fIESC\fP.
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Please note that you might need to hit \fIESC\fP twice on some terminals
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since it's regarded as a prefix key.
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+.SH VOLUME MAPPING
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+In \fBalsamixer\fP, the volume is mapped to a value that is more natural
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+for a human ear. The mapping is designed so that the position in the
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+interval is proportional to the volume as a human ear would perceive
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+it, i.e. the position is the cubic root of the linear sample
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+multiplication factor. For controls with a small range (24 dB or
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+less), the mapping is linear in the dB values so that each step has
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+the same size visually.
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+
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+Only for controls without dB information, a linear mapping of the
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+hardware volume register values is used (this is the same algorithm as
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+used in the old \fBalsamixer\fP).
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+
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.SH SEE ALSO
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\fB
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amixer(1),
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diff --git a/amixer/amixer.1 b/amixer/amixer.1
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index b1ac323..3ed20a9 100644
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--- a/amixer/amixer.1
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+++ b/amixer/amixer.1
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@@ -104,10 +104,21 @@ The commands to unmatched ids are ignored without errors too.
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.TP
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\fI\-h\fP
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Help: show syntax.
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+
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.TP
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\fI\-q\fP
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Quiet mode. Do not show results of changes.
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+.TP
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+\fI\-R\fP
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+Use the raw value for evaluating the percentage representation.
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+This is the default mode.
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+
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+.TP
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+\fI\-M\fP
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+Use the mapped volume for evaluating the percentage representation
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+like \fBalsamixer\fR, to be more natural for human ear.
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+
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.SH EXAMPLES
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.TP
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@@ -134,8 +145,14 @@ will set the third soundcard's second line playback volume(s) to 40%
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\fBamixer \-c 2 cset numid=34 40%\fR
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will set the 34th soundcard element to 40%
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+.SH SEE ALSO
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+\fB
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+alsamixer(1)
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+\fP
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+
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.SH BUGS
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None known.
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+
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.SH AUTHOR
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\fBamixer\fP is by Jaroslav Kysela <perex@perex.cz>.
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This document is by Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>.
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--
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1.7.9.2
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