build: Make alsadatadir configurable

Pipewire has started shipping copies of PulseAudio's ALSA card profiles.

It would be useful if both projects could share the same profiles and
this patch is a step toward that.

configure.ac

@@ -1511,6 +1511,13 @@ AC_ARG_WITH(
 AC_SUBST(modlibexecdir)
 AX_DEFINE_DIR(PA_DLSEARCHPATH, modlibexecdir, [Modules dir])
 
+AC_ARG_WITH(
+        [alsa-data-dir],
+        AS_HELP_STRING([--with-alsa-data-dir],[Directory for ALSA card profiles (defaults to ${datadir}/pulseaudio/alsa-mixer)]),
+        [alsadatadir=$withval], [alsadatadir="${datadir}/pulseaudio/alsa-mixer"])
+
+AC_SUBST(alsadatadir)
+
 AC_ARG_WITH(
         [udev-rules-dir],
         AS_HELP_STRING([--with-udev-rules-dir],[Directory where to install udev rules to (defaults to /lib/udev/rules.d)]),
@@ -1656,6 +1663,7 @@ echo "
     sysconfdir:                    ${sysconfdir}
     localstatedir:                 ${localstatedir}
     modlibexecdir:                 ${modlibexecdir}
+    alsadatadir:                   ${alsadatadir}
     System Runtime Path:           ${PA_SYSTEM_RUNTIME_PATH}
     System State Path:             ${PA_SYSTEM_STATE_PATH}
     System Config Path:            ${PA_SYSTEM_CONFIG_PATH}

meson.build

@@ -66,7 +66,11 @@ localedir = join_paths(prefix, get_option('localedir'))
 localstatedir = join_paths(prefix, get_option('localstatedir'))
 sysconfdir = join_paths(prefix, get_option('sysconfdir'))
 privlibdir = join_paths(libdir, 'pulseaudio')
-alsadatadir = join_paths(datadir, 'pulseaudio', 'alsa-mixer')
+
+alsadatadir = get_option('alsadatadir')
+if alsadatadir == ''
+  alsadatadir = join_paths(datadir, 'pulseaudio', 'alsa-mixer')
+endif
 
 pkgconfigdir = join_paths(libdir, 'pkgconfig')
 pulselibexecdir = join_paths(libexecdir, 'pulse')
@@ -788,6 +792,7 @@ summary = [
   'sysconfdir:                    @0@'.format(sysconfdir),
   'localstatedir:                 @0@'.format(localstatedir),
   'modlibexecdir:                 @0@'.format(modlibexecdir),
+  'alsadatadir:                   @0@'.format(alsadatadir),
   'System Runtime Path:           @0@'.format(cdata.get_unquoted('PA_SYSTEM_RUNTIME_PATH')),
   'System State Path:             @0@'.format(cdata.get_unquoted('PA_SYSTEM_STATE_PATH')),
   'System Config Path:            @0@'.format(cdata.get_unquoted('PA_SYSTEM_CONFIG_PATH')),

meson_options.txt

@@ -51,6 +51,9 @@ option('pulsedsp-location',
 option('modlibexecdir',
        type : 'string',
        description : 'Specify location where modules will be installed')
+option('alsadatadir',
+       type : 'string',
+       description : 'Directory for ALSA card profiles (defaults to ${datadir}/pulseaudio/alsa-mixer)')
 option('systemduserunitdir',
        type : 'string',
        description : 'Directory for systemd user service files')

src/Makefile.am

@@ -28,8 +28,8 @@ if HAVE_X11
 xdgautostartdir=$(sysconfdir)/xdg/autostart
 endif
 if HAVE_ALSA
-alsaprofilesetsdir=$(datadir)/pulseaudio/alsa-mixer/profile-sets
-alsapathsdir=$(datadir)/pulseaudio/alsa-mixer/paths
+alsaprofilesetsdir=$(alsadatadir)/profile-sets
+alsapathsdir=$(alsadatadir)/paths
 endif
 if HAVE_DBUS
 dbuspolicydir=$(sysconfdir)/dbus-1/system.d