[build] Add Android build action to GitHub CI (#2149)

Also corrected the 'build-android.sh' script.

Co-authored-by: Sergei Ignatov <sergeiignatov@users.noreply.github.com>

.github/workflows/android.yaml

@@ -0,0 +1,26 @@
+name: Android
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: NDK-R23
+    runs-on: ubuntu-18.04
+
+    steps:
+    - name: Setup Android NDK R23
+      uses: nttld/setup-ndk@v1
+      id: setup-ndk
+      with:
+        ndk-version: r23
+        add-to-path: false
+    - uses: actions/checkout@v2
+    - name: build
+      run: |
+        cd ./scripts/build-android/
+        echo ${{ steps.setup-ndk.outputs.ndk-path }}
+        source ./build-android -n ${{ steps.setup-ndk.outputs.ndk-path }}

scripts/build-android/build-android

@@ -10,7 +10,6 @@ echo_help()
   echo "    -e    Encryption library to be used. Possible options: openssl (default) mbedtls"
   echo "    -o    OpenSSL version. E.g. 1.1.1l"
   echo "    -m    Mbed TLS version. E.g. v2.26.0"
-  echo "    -s    SRT version. E.g. v1.4.4"
   echo
   echo "Example: ./build-android -n /home/username/Android/Sdk/ndk/23.0.7599858 -a 28 -t \"arm64-v8a x86_64\""
   echo
@@ -21,7 +20,6 @@ NDK_ROOT=""
 API_LEVEL=28
 BUILD_TARGETS="armeabi-v7a arm64-v8a x86 x86_64"
 OPENSSL_VERSION=1.1.1l
-SRT_VERSION=""
 ENC_LIB=openssl
 MBEDTLS_VERSION=v2.26.0
 
@@ -56,10 +54,8 @@ SCRIPT_DIR=$(pwd)
 HOST_TAG='unknown'
 unamestr=$(uname -s)
 if [ "$unamestr" = 'Linux' ]; then
- SCRIPT_DIR=$(readlink -f $0 | xargs dirname)
  HOST_TAG='linux-x86_64'
 elif [ "$unamestr" = 'Darwin' ]; then
- SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
  if [ $(uname -p) = 'arm' ]; then
   echo "NDK does not currently support ARM64"
   exit 128
@@ -93,12 +89,8 @@ else
  exit 128
 fi
 
-if [ ! -d $BASE_DIR/srt ]; then
- git clone https://github.com/Haivision/srt srt
- if [ ! -z "$SRT_VERSION" ]; then
-  git -C $BASE_DIR/srt checkout $SRT_VERSION
- fi
-fi
+# Build working copy of srt repository
+REPO_DIR="../.."
 
 for build_target in $BUILD_TARGETS; do
  LIB_DIR=$BASE_DIR/$build_target/lib
@@ -113,7 +105,7 @@ for build_target in $BUILD_TARGETS; do
   cp $LIB_DIR/libmbedx509.so $JNI_DIR/libmbedx509.so
  fi
 
- git -C $BASE_DIR/srt clean -fd
- $SCRIPT_DIR/mksrt -n $NDK_ROOT -a $API_LEVEL -t $build_target -e $ENC_LIB -s $BASE_DIR/srt -i $BASE_DIR/$build_target
+ git -C $REPO_DIR clean -fd -e scripts
+ $SCRIPT_DIR/mksrt -n $NDK_ROOT -a $API_LEVEL -t $build_target -e $ENC_LIB -s $REPO_DIR -i $BASE_DIR/$build_target
  cp $LIB_DIR/libsrt.so $JNI_DIR/libsrt.so
 done