diff --git a/scripts/common-functions.sh b/scripts/common-functions.sh
new file mode 100755
index 0000000..82062c2
--- /dev/null
+++ b/scripts/common-functions.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# Function that downloads an archive with the source code by the given url,
+# extracts its files and exports a variable SOURCES_DIR_lib${LIBRARY_NAME}
+function downloadArchive() {
+  LIBRARY_NAME=$1
+  LIBRARY_VERSION=$2
+  DOWNLOAD_URL=$3
+
+  echo "Ensuring sources of $LIBRARY_NAME $LIBRARY_VERSION"
+  LIBRARY_SOURCES=${LIBRARY_NAME}-${LIBRARY_VERSION}
+
+  if [[ ! -d "$LIBRARY_SOURCES" ]]; then
+    curl -O ${DOWNLOAD_URL}
+
+    ARCHIVE_NAME=${DOWNLOAD_URL##*/}
+    tar xf ${ARCHIVE_NAME} -C .
+    rm ${ARCHIVE_NAME}
+  fi
+
+  export SOURCES_DIR_lib${LIBRARY_NAME}=$(pwd)/${LIBRARY_SOURCES}
+}
diff --git a/scripts/libdav1d/download.sh b/scripts/libdav1d/download.sh
index ec0a7c5..acd83a8 100755
--- a/scripts/libdav1d/download.sh
+++ b/scripts/libdav1d/download.sh
@@ -1,19 +1,10 @@
 #!/usr/bin/env bash
 
-# Script to download Dav1d's source code
-
-# Exports SOURCES_DIR_libdav1d - path where actual sources are stored
+source ${SCRIPTS_DIR}/common-functions.sh
 
 DAV1D_VERSION=0.6.0
-echo "Using libdav1d $DAV1D_VERSION"
-DAV1D_SOURCES=dav1d-${DAV1D_VERSION}
-
-if [[ ! -d "$DAV1D_SOURCES" ]]; then
-  TARGET_FILE_NAME=dav1d-${DAV1D_VERSION}.tar.gz
-
-  curl https://code.videolan.org/videolan/dav1d/-/archive/${DAV1D_VERSION}/dav1d-${DAV1D_VERSION}.tar.gz --output ${TARGET_FILE_NAME}
-  tar xf ${TARGET_FILE_NAME} -C .
-  rm ${TARGET_FILE_NAME}
-fi
 
-export SOURCES_DIR_libdav1d=$(pwd)/${DAV1D_SOURCES}
+downloadArchive \
+  "dav1d" \
+  ${DAV1D_VERSION} \
+  "https://code.videolan.org/videolan/dav1d/-/archive/${DAV1D_VERSION}/dav1d-${DAV1D_VERSION}.tar.gz"