How to build multiple static libraries of ffmpeg to a dynamic library ffmpeg.so

原创于 2018-09-03 09:51:49 发布 · 765 阅读

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本文介绍如何使用Android NDK构建FFmpeg的静态库，并通过编写shell脚本将这些静态库进一步整合为动态链接库（.so文件）。文章详细说明了构建过程中的配置选项以及所用到的命令行工具。

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How to build ffmpeg is here, but you mast --enable-static because Multiple static libraries can generate a dynamic library. However, multiple dynamic libraries can not generate a dynamic library.

When you generate static libraries. you can use follow scrip generate ffmpeg.so

#!/bin/bash  
NDK=~/android-ndk-r14b/
SYSROOT=$NDK/platforms/android-14/arch-arm/  
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64  
CPU=armv7-a
PREFIX=$(pwd)/$CPU  
$TOOLCHAIN/bin/arm-linux-androideabi-ld \
	-rpath-link=$SYSROOT/usr/lib \
	-L$SYSROOT/usr/lib \
	-L$PREFIX/lib \
	-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o \
	$PREFIX/libffmpeg.so \
	$PREFIX/lib/libavutil.a \
	$PREFIX/lib/libavformat.a \
	$PREFIX/lib/libavcodec.a \
	$PREFIX/lib/libavfilter.a \
	$PREFIX/lib/libswresample.a \
	$PREFIX/lib/libpostproc.a \
	$PREFIX/lib/libswscale.a \
	-lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker \
	$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a \

Yes, is Linux “ld” command.