package/shairport-sync: add audio DSP convolution option

Already in version 3.1, shairport-sync added audio DSP convolution support. This
optional feature requires the sndfile library.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/shairport-sync/Config.in

@@ -20,6 +20,12 @@ config BR2_PACKAGE_SHAIRPORT_SYNC
 
 if BR2_PACKAGE_SHAIRPORT_SYNC
 
+config BR2_PACKAGE_SHAIRPORT_SYNC_CONVOLUTION
+	bool "convolution support"
+	select BR2_PACKAGE_LIBSNDFILE
+	help
+	  Enable audio DSP convolution support.
+
 config BR2_PACKAGE_SHAIRPORT_SYNC_LIBSOXR
 	bool "libsoxr support"
 	select BR2_PACKAGE_LIBSOXR

package/shairport-sync/shairport-sync.mk

@@ -51,6 +51,11 @@ SHAIRPORT_SYNC_CONF_LIBS += -lz
 endif
 endif
 
+ifeq ($(BR2_PACKAGE_SHAIRPORT_SYNC_CONVOLUTION),y)
+SHAIRPORT_SYNC_DEPENDENCIES += libsndfile
+SHAIRPORT_SYNC_CONF_OPTS += --with-convolution
+endif
+
 ifeq ($(BR2_PACKAGE_SHAIRPORT_SYNC_LIBSOXR),y)
 SHAIRPORT_SYNC_DEPENDENCIES += libsoxr
 SHAIRPORT_SYNC_CONF_OPTS += --with-soxr