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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。 FFmp...

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

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

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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:

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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:

配置Android Studio

  • 在local.properties加入ndk的路径,我这里是:

ndk.dir=/Users/maimingliang/Documents/NDK/android-ndk-r12b

也可以在project structure 中添加。如图所示:

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  • 在build.gradle 文件中添加图中标红处的内容。

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  • 配置javah,ndk-build ,ndk-build clean 命令

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添加javah命令:

![Uploading WechatIMG17_232544.jpeg . . .]

program:$JDKPath$/bin/javah

paramers:-classpath $Classpath$ -v -jni $FileClass$

working diretory : $ModuleFileDir$/src/main/jni

添加 ndk-build

IMG_4113.JPG

program:/Users/maimingliang/Documents/NDK/android-ndk-r12b/build/ndk-build //这里要修改你的ndk路径 的ndk-build

paramers:

working diretory : $ModuleFileDir$/src/main/jni

添加 ndk-build clean

IMG_4114.JPG

program:/Users/maimingliang/Documents/NDK/android-ndk-r12b/build/ndk-build //这里要修改你的ndk路径的 ndk-build

paramers:clean

working diretory : $ProjectFileDir$/app/src/main

  • 编写 C文件
  • 编写Android.mk文件
  • 编写Application.mk文件。
  • 运行 javah,ndk-build ndk-build clean 命令

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来自:http://www.jianshu.com/p/42c82169bb7d