Initial import

.gitignore

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+build
+output
+sources

README.md

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+# ffmpeg-android-maker
+
+Here is a script that downloads the source code of FFmpeg library and assembles it for Android. The script produces shared libraries as well as header files. The output structure looks like this:
+![Markdown Here logo](images/output_structure.png)
+The actual content of all this directories depends on how the FFmpeg was configured before assembling. For my purpose I enabled only *libavcodec*, *libavformat* and *libavutil*, but you can set your own configuration to make the FFmpeg you need.
+The version of FFmpeg here is **4.1.1**. And the script expects to use Android NDK **r19**. Starting with this versions of FFmpeg and NDK the whole process became much simpler.
+
+## Supported architectures
+
+* armeabi-v7a
+* arm64-v8a
+* x86
+* x86_64
+
+## Prerequisites
+
+You have to define an environment variable `ANDROID_NDK_HOME` and set the correct path to your Android NDK.
+
+## How to use
+
+Well, just execute the script :) Examine the `output` directory after.
+
+## Known issues:
+
+The x86 binary doesn't have assembler optimizations, since they bring text relocations. So it may encounter certain performance issues. The x86_64 doesn't have this problem though. 
+
+## TODO:
+
+Upload the sample project where the compiled library is actually used. 

ffmpeg-android-maker.sh

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+#!/usr/bin/env bash
+
+FFMPEG_VERSION=4.1.1
+
+# Directories used by the script
+BASE_DIR="$( cd "$( dirname "$0" )" && pwd )"
+SOURCES_DIR=${BASE_DIR}/sources
+FFMPEG_SOURCES=${SOURCES_DIR}/ffmpeg-${FFMPEG_VERSION}
+OUTPUT_DIR=${BASE_DIR}/output
+BUILD_DIR=${BASE_DIR}/build
+
+# No incremental compilation here. Just drop what was built previously
+rm -rf ${BUILD_DIR}
+rm -rf ${OUTPUT_DIR}
+mkdir -p ${OUTPUT_DIR}
+
+# Test if sources of the FFMpeg exist. If not - download them
+function ensureSources() {
+  if [[ ! -d "$FFMPEG_SOURCES" ]]; then
+    TARGET_FILE_NAME=ffmpeg-${FFMPEG_VERSION}.tar.bz2
+    TARGET_FILE_PATH=${SOURCES_DIR}/${TARGET_FILE_NAME}
+
+    mkdir -p ${SOURCES_DIR}
+    curl https://www.ffmpeg.org/releases/${TARGET_FILE_NAME} --output ${TARGET_FILE_PATH}
+    tar xvjf ${TARGET_FILE_PATH} -C ${SOURCES_DIR}
+    rm ${TARGET_FILE_PATH}
+  fi
+}
+
+# Actual magic of configuring and compiling of FFMpeg for a certain architecture.
+# Supported architectures are: armeabi-v7a, arm64-v8a, x86 and x86_64
+function assemble() {
+  cd ${FFMPEG_SOURCES}
+
+  ARCH=$1
+  API_LEVEL=$2
+
+  TOOLCHAIN_PATH=${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/darwin-x86_64
+  SYSROOT=${TOOLCHAIN_PATH}/sysroot
+
+  CC_ANDROID_POSTFIX=
+  EXTRA_CFLAGS=
+  EXTRA_CONFIGURE_FLAGS=
+
+  case $ARCH in
+  	armeabi-v7a)
+      FFMPEG_ARCH_FLAG=arm
+      CROSS_PREFIX=arm-linux-androideabi-
+      CC_PREFIX=armv7a
+      CC_ANDROID_POSTFIX=eabi
+  		;;
+  	arm64-v8a)
+      FFMPEG_ARCH_FLAG=aarch64
+      CROSS_PREFIX=aarch64-linux-android-
+      CC_PREFIX=aarch64
+  		;;
+    x86)
+      FFMPEG_ARCH_FLAG=x86
+      CROSS_PREFIX=i686-linux-android-
+      CC_PREFIX=i686
+      EXTRA_CFLAGS=-mno-stackrealign
+      EXTRA_CONFIGURE_FLAGS=--disable-asm
+  		;;
+    x86_64)
+      FFMPEG_ARCH_FLAG=x86_64
+      CROSS_PREFIX=x86_64-linux-android-
+      CC_PREFIX=x86_64
+  		;;
+  esac
+
+  CC=${TOOLCHAIN_PATH}/bin/${CC_PREFIX}-linux-android${CC_ANDROID_POSTFIX}${API_LEVEL}-clang
+
+  ./configure \
+    --prefix=${BUILD_DIR}/${ARCH} \
+    --disable-doc \
+    --enable-cross-compile \
+    --cross-prefix=${TOOLCHAIN_PATH}/bin/${CROSS_PREFIX} \
+    --target-os=android \
+    --cc=${CC} \
+    --arch=${FFMPEG_ARCH_FLAG} \
+    --extra-cflags="-O3 -fPIC $EXTRA_CFLAGS" \
+    --sysroot=${SYSROOT} \
+    --enable-shared \
+    --disable-static \
+    --disable-debug \
+    --enable-small \
+    --disable-runtime-cpudetect \
+    --disable-programs \
+    --disable-muxers \
+    --disable-encoders \
+    --disable-bsfs \
+    --disable-pthreads \
+    --disable-avdevice \
+    --disable-swscale \
+    --disable-network \
+    --disable-postproc \
+    --disable-swresample \
+    --disable-avfilter \
+    ${EXTRA_CONFIGURE_FLAGS}
+
+    make clean
+    make -j8
+    make install
+
+    cd ${BASE_DIR}
+}
+
+# Placing build *.so files into the /bin directory
+function installLibs() {
+  BUILD_SUBDIR=$1
+
+  OUTPUT_SUBDIR=${OUTPUT_DIR}/lib/${BUILD_SUBDIR}
+  CP_DIR=${BUILD_DIR}/${BUILD_SUBDIR}
+
+  mkdir -p ${OUTPUT_SUBDIR}
+  cp ${CP_DIR}/lib/*.so ${OUTPUT_SUBDIR}
+}
+
+function build() {
+  ARCH=$1
+  ANDROID_API=$2
+
+  assemble ${ARCH} ${ANDROID_API}
+  installLibs ${ARCH}
+}
+
+# Placing build header files into the /bin directory
+# Note, there is a only one such a folder since this headers are the same for all architectures
+# May not be true for different configurations though
+function installHeaders() {
+  cd ${BUILD_DIR}
+  cd "$(ls -1 | head -n1)"
+  cp -r include ${OUTPUT_DIR}
+  cd ${BASE_DIR}
+}
+
+# Actual work
+
+ensureSources
+
+build armeabi-v7a 16
+build arm64-v8a 21
+build x86 16
+build x86_64 21
+
+installHeaders