This isn't Ubuntu/Debian specific and should be applied upstream? On Sat, 07 Jul 2007 the mental interface of David Decotigny told: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > 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, > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.6 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iD8DBQFGj/X0ld7vhusVrCERAjIZAJ9w9GLD+QBwDCaTs32hpW6i9nVMfgCfdS5w > jhipZ2jm87fq4zx4f5Q9Vsc= > =M2KP > -----END PGP SIGNATURE----- > diff -ru alsa-utils-1.0.13/amixer/amixer.1 alsa-utils-1.0.13-mine/amixer/amixer.1 > --- alsa-utils-1.0.13/amixer/amixer.1 2006-09-29 04:53:26.000000000 -0700 > +++ alsa-utils-1.0.13-mine/amixer/amixer.1 2007-07-07 13:09:04.000000000 -0700 > @@ -44,11 +44,14 @@ > The parameters \fIcap, nocap, mute, unmute, toggle\fP are used to > change capture (recording) and muting for the group specified. > > -The optional modifiers can be put as extra parameters to specify > -the stream direction or channels to apply. > -The modifiers \fIplayback\fP and \fIcapture\fP specify the stream, > -and the modifiers \fIfront, rear, center, woofer\fP are used to specify > -channels to be changed. > +The optional modifiers can be put as extra parameters to specify the > +stream direction or channels to apply. The modifiers \fIplayback\fP > +and \fIcapture\fP specify the stream, and the modifiers \fIfront, > +rear, center, woofer\fP are used to specify channels to be changed. If > +there is a confusion between the parameter and these modifiers, then > +any character in the parameter may be escaped with a backslash to > +disambiguate: '\\Front Mic' will be understood as "parameter 'Front > +Mic'", and not as "modifier 'Front' applied to 'Mic' parameter". > > A simple mixer control must be specified. Only one device can be controlled > at a time. > diff -ru alsa-utils-1.0.13/amixer/amixer.c alsa-utils-1.0.13-mine/amixer/amixer.c > --- alsa-utils-1.0.13/amixer/amixer.c 2007-07-07 13:03:39.000000000 -0700 > +++ alsa-utils-1.0.13-mine/amixer/amixer.c 2007-07-07 12:59:19.000000000 -0700 > @@ -1333,6 +1333,16 @@ > return def; > } > > +/** Transform '\a\b c \de' into 'ab c de' */ > +static void unescape(char * arg) > +{ > + char * c; > + for (c = arg ; arg && *arg ; arg ++) > + if (*arg != '\\') > + *(c++) = *arg; > + *c = '\0'; > +} > + > static int get_enum_item_index(snd_mixer_elem_t *elem, char **ptrp) > { > char *ptr = *ptrp; > @@ -1347,7 +1357,7 @@ > if (snd_mixer_selem_get_enum_item_name(elem, i, sizeof(name)-1, name) < 0) > continue; > len = strlen(name); > - if (! strncmp(name, ptr, len)) { > + if (!strncmp(name, ptr, len) && (ptr[len] == '\0')) { > if (! ptr[len] || ptr[len] == ',' || ptr[len] == '\n') { > ptr += len; > *ptrp = ptr; > @@ -1428,6 +1438,7 @@ > dir = dir_mask(&ptr, dir); > if (*ptr == '\0') > continue; > + unescape(ptr); > multi = (strchr(ptr, ',') != NULL); > optr = ptr; > for (chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++) { > _______________________________________________ > Pkg-alsa-devel mailing list > Pkg-alsa-devel@xxxxxxxxxxxxxxxxxxxxxxx > http://lists.alioth.debian.org/mailman/listinfo/pkg-alsa-devel -- "Talking much about oneself can also be a means to conceal oneself." -Friedrich Nietzsche
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