Linux下编译Android ffmpeg库（mediacodec 硬件解码）

NDK：android-ndk-r14b-linux-x86_64.zip NDK下载地址

Linux：Ubuntu

1.将下载好的NDK、ffmpeg解压，待用；

2.在ffmepg目录下，编辑configure文件，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)'

修改为

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

3.在ffmpeg源码目录下，编辑build.sh文件

#!/bin/bash
NDK=/home/share/ffandroid/android-ndk-r14b
SYSROOT=$NDK/platforms/android-21/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64

CPU=arm
PREFIX=/project/codec/jni
ADDI_CFLAGS="-marm"

function build_one
{
./configure \
--prefix=../outbin6 \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-doc \
--disable-symver \
--enable-small \
--enable-jni \
--enable-mediacodec \
--enable-decoder=h264_mediacodec \
--enable-hwaccel=h264_mediacodec \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=android \
--arch=arm \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
}

build_one

注意：--target-os的值是android，而不是Linux；

4.编译