IT博客汇 | Android Studio编译FFmpeg

前言

编译FFmpeg的Android版本，并整合到Android Studio。

系统：macOS Sierra 10.12。

NDK版本：r12b。

FFmpeg版本：3.1.3

编译FFmpeg的步骤

下载 NDK 。
下载 ffmpeg源码，解压到NDK目录下的sources目录下。如图

WechatIMG9.jpeg

修改ffmpeg-3.1.3目录下的configure文件定位到3309行：如图：

WechatIMG11.jpeg

将

SLIBNAME_WITH_MAJOR='(SLIBNAME).(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='(RANLIB)"(LIBDIR)/(LIBNAME)"'
SLIB_INSTALL_NAME='(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='(SLIBNAME_WITH_MAJOR) (SLIBNAME)'

改成

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

目的是将生成.so名称规范化，用以满足android build。

在当前目录下新建一个build_android.sh文件，如图：

WechatIMG13.jpeg

内容为：

#!/bin/bash
NDK=/Users/maimingliang/Documents/NDK/android-ndk-r12b
SYSROOT=NDK/platforms/android-15/arch-arm/
TOOLCHAIN=NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
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

打开终端并且把路径切换到build_android 所在的目录，执行命令

./build_android.sh

完成编译以后，进入生成的android文件夹，在arm文件夹里面新建一个Android.mk文件，内容为：

LOCAL_PATH:= (call my-dir)

include (CLEAR_VARS)
LOCAL_MODULE:= libavcodec
LOCAL_SRC_FILES:= lib/libavcodec-57.so
LOCAL_EXPORT_C_INCLUDES := (LOCAL_PATH)/include
include (PREBUILT_SHARED_LIBRARY)

include (CLEAR_VARS)
LOCAL_MODULE:= libavformat
LOCAL_SRC_FILES:= lib/libavformat-57.so
LOCAL_EXPORT_C_INCLUDES := (LOCAL_PATH)/include
include (PREBUILT_SHARED_LIBRARY)

include (CLEAR_VARS)
LOCAL_MODULE:= libswscale
LOCAL_SRC_FILES:= lib/libswscale-4.so
LOCAL_EXPORT_C_INCLUDES := (LOCAL_PATH)/include
include (PREBUILT_SHARED_LIBRARY)

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

include (CLEAR_VARS)
LOCAL_MODULE:= libavfilter
LOCAL_SRC_FILES:= lib/libavfilter-6.so
LOCAL_EXPORT_C_INCLUDES := (LOCAL_PATH)/include
include (PREBUILT_SHARED_LIBRARY)

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

至此FFmpeg的编译完成，下面整合到Android Studio 中：