simplifying the libopus download.sh

scripts/libopus/download.sh

@@ -1,19 +1,9 @@
 #!/usr/bin/env bash
 
-# Script to download Opus's source code
-
-# Exports SOURCES_DIR_libopus - path where actual sources are stored
+source ${SCRIPTS_DIR}/common-functions.sh
 
 OPUS_VERSION=1.3.1
-echo "Using libopus $OPUS_VERSION"
-OPUS_SOURCES=opus-${OPUS_VERSION}
-
-if [[ ! -d "$OPUS_SOURCES" ]]; then
-  TARGET_FILE_NAME=opus-${OPUS_VERSION}.tar.gz
-
-  curl https://archive.mozilla.org/pub/opus/${TARGET_FILE_NAME} --output ${TARGET_FILE_NAME}
-  tar xf ${TARGET_FILE_NAME} -C .
-  rm ${TARGET_FILE_NAME}
-fi
 
-export SOURCES_DIR_libopus=$(pwd)/${OPUS_SOURCES}
+downloadTarArchive \
+  "libopus" \
+  "https://archive.mozilla.org/pub/opus/opus-${OPUS_VERSION}.tar.gz"