I wanted to work with FFMPEG libs on android ICS and found the excellent prior work by “roman10″ here and here. Note that roman’s source will be required from item 5 in the 2nd of the above links. Alot of associated forum traffic links to roman’s how-to with compile questions/errors or problems with specific cross toolchains. In order to distill the build process and to add a bit to the earlier work, heres my experience on Windows 64 platform where i added Vmware and Ubuntu (64 bit with additional i386 libs compatible with the 32 bit NDK ) specifically for work with ffmpeg on android. Im a veteran windows cygwin / MingW user but this time, rather than to use MingW and native windows I chose a vm based on what i learned from others in the forums. With some minor tweeks, the VM approach using following work OK:
- VMPlayer
- Ubuntu 12.04
- open java-jdk
- Ant
- android SDK
- android NDK
At the end of the build you will have an android apk including the libffmpeg.so and the so for the jni c-file of roman10.
I believe that libffmpeg.so has the following linked statically:
-o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a
I used the following steps:
INSTALL VMWare Player and link it to ISO with Ubuntu 12.04
Vmware player app is free and needs a separate Ubuntu ISO image. After install of the player on windows , you can install the ISO and will then have Linux version running in the VM.
Get the iso for Ubuntu 12.04 (64 bit) here
Get the VMPLAYER app. here
Install vmplayer. Start it up.
Find menu for “create new virtual machine” in the player app.
Select the ISO file, finish the dialog and you will have a new VM environment for Ubuntu.
UPDATE Ubuntu
RTFM on “apt-get” if needed. Docs on open JDK here.
start a terminal shell in Ubuntu by using the “Dash” icon at the top of the left-hand list of icons in the Ubuntu “unity” GUI.
- sudo apt-get update // this updates repo data used by the package manager
- sudo apt-get install curl // needed for downloads
- sudo apt-get install openjdk-6-jdk // installs the jdk needed by Ant and by Android SDK
- sudo apt-get -u install ant // Ant will be needed for building Android projects
- cd ~/ // this will get you to your home directory
- mkdir src // create a child in your home path for source code
- unix home dir will look like below:
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Desktop
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Documents
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Downloads
-rw-r--r-- 1 rob rob 8445 Jun 15 09:25 examples.desktop
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Music
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Pictures
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Public
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 src
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Templates
drwxr-xr-x 2 rob rob 4096 Jun 15 09:36 Videos
read about the “ialibs” here. Instead of the sledgehammer ialabs approach, install much smaller “i386″ libs in the list:
sudo apt-get install libgcc1:i386
sudo apt-get install zlib1g:i386
sudo apt-get install tzdata:i386
sudo apt-get install libstdc++6:i386
sudo apt-get install libncurses5-dev:i386
Your linux env should now have libs required for 32 bit cross toolchains.
Install SDK and NDK
$ curl -#LO http://dl.google.com/android/android-sdk_r18-linux.tgz //get sdk
$ cd src src$ tar -xzf ../android-sdk_r18-linux.tgz //unpack sdk in src dir
$ curl -#LO http://dl.google.com/android/ndk/android-ndk-r8-linux-x86.tar.bz2 // get NDK
$ cd src $ tar -xvf ../android-ndk-r8-linux-x86.tar.bz2 //unpack ndk in src dir
edit the file ~/.bashrc // adding following ENV
$export PATH=$PATH:/home/rob/src/android-sdk-linux/platform-tools // add the location of the SDK's tools to Path
$export PATH=$PATH:/home/rob/src/android-sdk-linux/tools //add the location of the SDK's tools to Path
$export JAVA_HOME=/usr/lib/jvm/java-6-openjdk-amd64 //add java to path if not there
$export NDK=/home/rob/src/android-ndk-r8 // add ndk to path
Read the docs in the $ndk/docs directory.
Run the script to make the standalone toolchain from the NDK .
$NDK/build/tools/make-standalone-toolchain.sh --arch=arm --ndk-dir=$NDK --platform=android-14 --install-dir=/tmp/my-android-toolchain
Auto-config: --toolchain=arm-linux-androideabi-4.4.3
Copying prebuilt binaries...
Copying sysroot headers and libraries...
Copying libstdc++ headers and libraries...
Copying files to: /tmp/my-android-toolchain
Install Roman10 source for Android FFmpeg
$ curl -#LO http://www.roman10.net/src/ffmpegtest.tar.gz //get ffmpeg
$ cd src src
$ tar -xzf ../ffmpegtest.tar.gz //unpack sdk in src dir ~/src/FFmpegTest is home of roman10 project
Integrate Ant with the Android project FFmpegTest
Update the android project with ant wrapper files:
$ cd ~/src
$ android create project -n FFmpegTest -t 1 -p FFmpegTest -k roman10.ffmpegTest -a FFmpegView
add a required ant xml file described below:
<?xml version=”1.0″ encoding=”UTF-8″?>
<project name=”FFmpegTest”>
<target name=”-pre-build”>
<exec executable=”${ndk.dir}/ndk-build” failonerror=”true”/>
</target>
<target name=”clean” depends=”android_rules.clean”>
<exec executable=”${ndk.dir}/ndk-build” failonerror=”true”>
<arg value=”clean”/>
</exec>
</target>
</project>
Put the xml above into file ./FFMpegTest/custom_rules.xml where it will get picked up by the ant build. Note that eclipse is not being used in this example ( not necessary).
Update ./FFmpegTest/jni/ffmpeg-0.8/build_android.sh
Note that i already set the ENV for $NDK and that i want armv7-a without neon , so the following changes in build_android.sh are necessary.
#NDK=~/Desktop/android/android-ndk-r5b
PLATFORM=$NDK/platforms/android-14/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
...
#arm v7n
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -marm -march=$CPU -mtune=cortex-a8"
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
build_one
Build the Project
run the build_android.sh
you should have the following in ./jni/ffmpeg-0.8:
rob@ubuntu:ffmpeg-0.8$ ls -l android/armv7-a/
total 5684
drwxrwxr-x 2 rob rob 4096 Jun 16 11:37 bin
drwxrwxr-x 6 rob rob 4096 Jun 16 11:11 include
drwxrwxr-x 3 rob rob 4096 Jun 16 11:37 lib
-rwxrwxr-x 1 rob rob 5800015 Jun 16 11:37 libffmpeg.so
drwxrwxr-x 3 rob rob 4096 Jun 16 11:11 share
run ant in the project root where the build.xml file is.
ant -Dndk.dir=/home/rob/src/android-ndk-r8 -verbose -logfile ./build.log debug
content bin dir should be below:
rob@ubuntu:FFmpegTest$ ls -l bin
total 1692
-rw-rw-r-- 1 rob rob 179 Jun 16 11:50 build.prop
drwxrwxr-x 4 rob rob 4096 Jun 16 11:50 classes
-rw-rw-r-- 1 rob rob 27560 Jun 16 11:50 classes.dex
-rw-rw-r-- 1 rob rob 2626 Jun 16 11:50 classes.dex.d
-rw-rw-r-- 1 rob rob 41452 Jun 16 11:50 FFmpegTest.ap_
-rw-rw-r-- 1 rob rob 2012 Jun 16 11:50 FFmpegTest.ap_.d
-rw-rw-r-- 1 rob rob 812849 Jun 16 11:50 FFmpegTest-debug.apk
-rw-rw-r-- 1 rob rob 812828 Jun 16 11:50 FFmpegTest-debug-unaligned.apk
-rw-rw-r-- 1 rob rob 340 Jun 16 11:50 FFmpegTest-debug-unaligned.apk.d
-rw-rw-r-- 1 rob rob 119 Jun 16 11:50 jarlist.cache
