Android porting – FFMPEG with NDK (1)

FFMPEG is a fantastic & great library for video application development. It has many functions for modification, capturing, streaming, etc. For the first step, We have to compile FFMPEG library for Android. Google supply NDK(Native Development Kit) for using native C/C++ code.

Reference by How to Build ffmpeg with NDK r9 – Roman

Cygwin or MinGW Installation

As you know, Cygwin is a virtual Linux machine on Windows OS and MinGW is gcc compiler set . Download from Cygwin Installation website or MinGW
In my case, I use Windows 8 and Cygwin has some permission control problem (test compile error when ./configure). I installed MinGW (Installed package : mingw-developer-toolkit, mingw32-base, mingw32-gcc-g++, msys-base )

NDK Install & FFMPEG Compile

1) Download NDK latest version from Android NDK website. At the timing of blogging, the latest version is NDK-r10 (Decompress at c:\android-ndk-r10)

2) Download FFMPEG from ffmpeg website. The latest stable release is 2.3. Download the source code and decompress it to c:\android-ndk-r10\sources folder. (c:\android-ndk-r10\sources\ffmpeg-2.3)

3) Open ffmpeg-2.3/configure file with a text editor and change: (CAUTION: When you make files by Windows Editor, You have to save UNIX file format because carriage return code is different : \n vs \n\r)

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'TEMP
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

make directory in ffmpeg-2.3/ffmpegtemp folder and change mode +x. change temporary file directory as below. This directory is temporary directory for compiler testing

# set temporary file name
TEMPDIR="c:/ffmpegtmp"
TMP="c:/ffmpegtmp"
: ${TMPDIR:=$TEMPDIR}
: ${TMPDIR:=$TMP}
: ${TMPDIR:="c:/ffmpegtmp"}

4) Make script file for compile : a.sh

#!/bin/bash
NDK=c:/android-ndk-r10
SYSROOT=$NDK/platforms/android-9/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows
function build_one
{
./configure \
--prefix=$PREFIX \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=linux \
--arch=arm \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one

5) Change the a.sh file permission  ‘-x’. I always use chmod 777 ^^;; and then execute script

./a.sh

Compile time is so long….. Go to cafe and drink something with your friend. If you don’t have friends, Visit FFMPEG ORG 🙂

If you finished. You can see the folder  c:\android-ndk-r10\sources\ffmpeg-2.3\android\arm\include & c:\android-ndk-r10\sources\ffmpeg-2.3\android\arm\lib

 

Import MPEG library in Android Project

1) We compiled ffmpeg libraries and we can use them. We stored ffmepg files under /samples/ffmpeg-2.3 directory because external modules have to be use NDK build. For external use of ffmepg library, we have to make a ‘Android.mk’ file in c:\android-ndk-r10\sources\ffmpeg-2.3\android\arm\ directory as below

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavcodec
LOCAL_SRC_FILES:= lib/libavcodec-55.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavformat
LOCAL_SRC_FILES:= lib/libavformat-55.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libswscale
LOCAL_SRC_FILES:= lib/libswscale-2.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavutil
LOCAL_SRC_FILES:= lib/libavutil-52.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libavfilter
LOCAL_SRC_FILES:= lib/libavfilter-3.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE:= libwsresample
LOCAL_SRC_FILES:= lib/libswresample-0.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)

2) Make Android Application

Using Eclipse, Make New Android project in samples directory

Project name: FFTest
Build Target: Android 4.0
Application name: FFTest
Package name: com.example.FFTest
Create Activity: FFTest
Min SDK Version: API 8