编译环境
- Mac OS X Capitan 10.11.3
- NDK-r10e (64-bit)
- FFmpeg 3.0
简介
在看完了第一篇Android最简单的基于FFmpeg的例子(一)—编译FFmpeg类库的基础上再看这一篇,在前一文中,
编译FFmpeg生成了六个SO文件,如图:
由于数目繁多，直接使用这些类库还是比较麻烦的. 因此可以将它们合并为一个类库 libffmpeg.so .
操作步骤
与前文记录的脚本不同，这个脚本不再需要修改Configure的内容（生成的是.a而不是.so，并没有涉及到版本号问题)
前文记录的脚本里面Configure的时候是“–enable-shared –disable-static”，这个脚本里面Configure的时候设置的是“–enable-static –disable-shared”。
- 编译完成后生成的是：
- libavcodec.a
- libavfilter.a
- libswresample.a
- libavformat.a
- libavutil.a
- libswscale.a
该脚本运行完后，会把上述的*.a文件打包为一个so文件：
- libffmpeg.so
合并后的类库使用起来和合并前的类库使用方法没有区别。
修改后的脚本文件为:
build_android.sh
#!/bin/bash
export TMPDIR=/Users/hubin/Desktop/ffmpeg-3.0/ffmpegtemp #这句很重要，不然会报错 unable to create temporary file in
# NDK的路径，根据自己的安装位置进行设置
NDK=~/Applications/android-sdk/ndk-bundle
# 编译针对的平台，可以根据自己的需求进行设置
# 这里选择最低支持android-14, arm架构，生成的so库是放在
# libs/armeabi文件夹下的，若针对x86架构，要选择arch-x86
PLATFORM=$NDK/platforms/android-14/arch-arm
# 工具链的路径，根据编译的平台不同而不同
# arm-linux-androideabi-4.9与上面设置的PLATFORM对应，4.9为工具的版本号，
# 根据自己安装的NDK版本来确定，一般使用最新的版本
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
function build_one
{
./configure \
--prefix=$PREFIX \
--target-os=linux \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--arch=arm \
--sysroot=$PLATFORM \
--extra-cflags="-I$PLATFORM/usr/include" \
--cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc \
--nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm \
--disable-shared \
--enable-runtime-cpudetect \
--enable-gpl \
--enable-small \
--enable-cross-compile \
--disable-debug \
--enable-static \
--disable-doc \
--disable-asm \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-postproc \
--disable-avdevice \
--disable-symver \
--disable-stripping \
$ADDITIONAL_CONFIGURE_FLAG
sed -i '' 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.h
sed -i '' 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.h
sed -i '' 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.h
sed -i '' 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.h
sed -i '' 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.h
sed -i '' 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.h
sed -i '' 's/HAVE_CBRT 0/HAVE_CBRT 1/g' config.h
sed -i '' 's/HAVE_RINT 0/HAVE_RINT 1/g' config.h
make clean
make -j4
make install
$TOOLCHAIN/bin/arm-linux-androideabi-ld \
-rpath-link=$PLATFORM/usr/lib \
-L$PLATFORM/usr/lib \
-L$PREFIX/lib \
-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o \
$PREFIX/libffmpeg.so \
libavcodec/libavcodec.a \
libavfilter/libavfilter.a \
libswresample/libswresample.a \
libavformat/libavformat.a \
libavutil/libavutil.a \
libswscale/libswscale.a \
-lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker \
$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a \
}
# arm v7vfp
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
PREFIX=./android/$CPU-vfp
ADDITIONAL_CONFIGURE_FLAG=
build_one
# CPU=armv
# PREFIX=$(pwd)/android/$CPU
# ADDI_CFLAGS="-marm"
# build_one
#arm v6
#CPU=armv6
#OPTIMIZE_CFLAGS="-marm -march=$CPU"
#PREFIX=./android/$CPU
#ADDITIONAL_CONFIGURE_FLAG=
#build_one
#arm v7vfpv3
# CPU=armv7-a
# OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
# PREFIX=./android/$CPU
# ADDITIONAL_CONFIGURE_FLAG=
# build_one
#arm v7n
#CPU=armv7-a
#OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
#PREFIX=./android/$CPU
#ADDITIONAL_CONFIGURE_FLAG=--enable-neon
#build_one
#arm v6+vfp
#CPU=armv6
#OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
#PREFIX=./android/${CPU}_vfp
#ADDITIONAL_CONFIGURE_FLAG=
#build_one
执行build_android.sh：
| 1 | $ chmod +x build_android.sh |
| 1 | $ ./build_android.sh |
等待一会,编译成功以后就可以看到单个库版的FFmpeg了.
在 ffmpeg-3.0/android 目录下就能找到编译好的文件：
测试单个库版的FFmpeg
在Android最简单的基于FFmpeg的例子(二)—测试编译好的SO库的基础上,稍加修改就可以.
替换src/main/jni目录中的SO文件
替换前:
替换后:
修改Android.mk文件
修改前:
LOCAL_PATH := $(call my-dir) # FFmpeg library include $(CLEAR_VARS) LOCAL_MODULE := avcodec LOCAL_SRC_FILES := libavcodec-57.so include $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := avfilter LOCAL_SRC_FILES := libavfilter-6.so include $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := avformat LOCAL_SRC_FILES := libavformat-57.so include $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := avutil LOCAL_SRC_FILES := libavutil-55.so include $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := swresample LOCAL_SRC_FILES := libswresample-2.so include $(PREBUILT_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := swscale LOCAL_SRC_FILES := libswscale-4.so include $(PREBUILT_SHARED_LIBRARY) # Program include $(CLEAR_VARS) LOCAL_MODULE := ffmpegdemo LOCAL_SRC_FILES := ffmpegdemo.c LOCAL_C_INCLUDES += $(LOCAL_PATH)/include LOCAL_LDLIBS := -llog -lz LOCAL_SHARED_LIBRARIES := avcodec avfilter avformat avutil swresample swscale include $(BUILD_SHARED_LIBRARY)
修改后:
LOCAL_PATH := $(call my-dir) # FFmpeg library include $(CLEAR_VARS) LOCAL_MODULE := ffmpeg LOCAL_SRC_FILES := libffmpeg.so include $(PREBUILT_SHARED_LIBRARY) # Program include $(CLEAR_VARS) LOCAL_MODULE := ffmpegdemo LOCAL_SRC_FILES := ffmpegdemo.c LOCAL_C_INCLUDES += $(LOCAL_PATH)/include LOCAL_LDLIBS := -llog -lz LOCAL_SHARED_LIBRARIES := ffmpeg include $(BUILD_SHARED_LIBRARY)
修改MainActivity.java 加载SO库的代码
修改前:
static {
System.loadLibrary("avcodec-57");
System.loadLibrary("avfilter-6");
System.loadLibrary("avformat-57");
System.loadLibrary("avutil-55");
System.loadLibrary("swresample-2");
System.loadLibrary("swscale-4");
System.loadLibrary("ffmpegdemo");
}
修改后:
static {
System.loadLibrary("ffmpeg");
System.loadLibrary("ffmpegdemo");
}
Module:FFmpeg-Single-SO
Demo APK下载地址:https://www.pgyer.com/FFmpegSingleSO
参考：
标签：FFmpeg,--,arm,编译,SO,android,include,LOCAL,CPU From： https://www.cnblogs.com/kn-zheng/p/17004966.html