[Pkg-alsa-devel] [PATCH] amixer and special 'front...' channels

[David Decotigny]

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Hi,

Imagine you have this kind of control:

Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line'
  Item0: 'Mic'

... and you want to set it to 'Front Mic':

shell> amixer sset 'Input Source' 'Front Mic'
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line'
  Item0: 'Mic'

This does not work ! Because amixer will think that 'Front' is a
modifier for 'Mic'.

Attached is a patch against alsa-utils-1.0.13-1ubuntu5 that solves this.
With this patch, one can bypass the modifier parsing: one simply escapes
the parameter with one or more backslash(es), and that's all:

shell> amixer sset 'Input Source' '\Front Mic'
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line'
  Item0: 'Front Mic'

What this patch also does, is that it adds correct identification of
items. With the original version, given the following enumeration:
  foo foobar
Then the parameter 'foobar' will be identified as 'foo', not 'foobar'.
The patch should solve this potential problem (not tested though).

Bye,
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