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

Android Studio编译FFmpeg

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

Android Studio编译FFmpeg

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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：

Android Studio编译FFmpeg

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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：