snowboy: add recipe

KittAI's snowboy Wakeword Engine is required to detect
wake word "Alexa" to trigger further speach communication
towards Alexa Voice Service. The recipe is taken from the
following source and modified.

https://github.com/alexa/aac-sdk/blob/1.5/builder/meta-aac/recipes-wakeword/snowboy/

Signed-off-by: Tariq Ansari <tansari@luxoft.com>

recipes-alexa/snowboy/snowboy_1.3.0.bb

@@ -0,0 +1,47 @@
+#
+#   Copyright (c) 2019 Amazon.com, Inc.
+#   Copyright (c) 2019 Luxoft Sweden AB
+#
+#   SPDX-License-Identifier: Apache-2.0
+#
+
+SUMMARY = "Snowboy Hotword Detection by KITT.AI"
+HOMEPAGE = "https://snowboy.kitt.ai/"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=8d385adc93db3f7e5d092b82fb2c9353"
+
+SRC_URI = "https://github.com/Kitt-AI/snowboy/archive/v${PV}.tar.gz"
+SRC_URI[md5sum] = "e16e117914f76f4a35facb16b0fcd61b"
+SRC_URI[sha256sum] = "93658cc5d4d83dd7a6e954d0dc1e18d1c70b1dd8623181850c4804d3aca19e96"
+
+COMPATIBLE_MACHINE = "(machine-native|android|intel-corei7-64|raspberrypi3)"
+
+INSANE_SKIP_${PN} += "already-stripped"
+
+def get_snowboy_arch(d):
+    machine = d.getVar('MACHINE')
+    if machine == "androidarm":
+        return "android/armv7a"
+    elif machine == "androidarm64":
+        return "android/armv8-aarch64"
+    elif machine == "intel-corei7-64":
+        return "ubuntu64"
+    elif machine == "raspberrypi3":
+        return "rpi"
+    else:
+        return "ubuntu64"
+
+SNOWBOY_ARCH ?= "${@get_snowboy_arch(d)}"
+
+do_install() {
+    mkdir -p ${D}${libdir}
+    cp ${S}/lib/${SNOWBOY_ARCH}/libsnowboy-detect.a ${D}${libdir}
+    mkdir -p ${D}${includedir}
+    cp ${S}/include/snowboy-detect.h ${D}${includedir}
+
+    install -d ${D}${datadir}/snowboy
+    install -m 0755 ${S}/resources/common.res ${D}${datadir}/snowboy/
+    install -m 0755 ${S}/resources/alexa/alexa-avs-sample-app/alexa.umdl ${D}${datadir}/snowboy/
+}
+
+FILES_${PN} = "${datadir}/snowboy/alexa.umdl ${datadir}/snowboy/common.res"