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FFmepg编译及CMake 集成到 Android

2019-07-02 15:49:11 作者：互联网

FFmepg编译及集成到 Android

编译文件修改
打包so 执行
集成到Android

准备编译

采用ubuntu系统编译, 系统版本不影响

	 apt-get update
     apt-get install yasm
     apt-get install pkg-config

安装 NDK 本文采用
ndk r15c 或 ndk r19
经测试，NDK版本影响不大，只要不是太低就好
ndk r15下载
 ndk 最新版
下载FFmpeg 版本本文采用 ffmpeg3.4.5
曾采用4.1.3版本，但是脚本文件有些问题，网上查阅的并不好用，文章末尾提供4.1.3版本sh（不一定好用，需要修改）

修改 configure

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)'

x264脚本如果不需要，你需要将下方 ffmepg 脚本用的x264的地方加 # 下载 x264

#!/bin/bash
NDK=/home/oblvion/Desktop/ffmpeg/android-ndk-r15c

configure()
{
    CPU=$1
    PREFIX=$(pwd)/android/$CPU
    HOST=""
    CROSS_PREFIX=""
    SYSROOT=""
    if [ "$CPU" == "armv7-a" ]
    then
        HOST=arm-linux
        SYSROOT=$NDK/platforms/android-21/arch-arm/
        CROSS_PREFIX=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
    else
        HOST=aarch64-linux
        SYSROOT=$NDK/platforms/android-21/arch-arm64/
        CROSS_PREFIX=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-
    fi
    ./configure \
    --prefix=$PREFIX \
    --host=$HOST \
    --enable-pic \
    --enable-static \
    --enalbe-neon \
    --extra-cflags="-fPIE -pie" \
    --extra-ldflags="-fPIE -pie" \
    --cross-prefix=$CROSS_PREFIX \
    --sysroot=$SYSROOT
}

build()
{
    make clean
    cpu=$1
    echo "build $cpu"

    configure $cpu
    #-j<CPU核心数>
    make -j4
    make install
}

#build arm64
build armv7-a

ffmpeg 脚本

#!/bin/bash
NDK=/home/oblvion/Desktop/ffmpeg/android-ndk-r15c

ADDI_CFLAGS="-fPIE -pie"
ADDI_LDFLAGS="-fPIE -pie"

configure()
{
    CPU=$1
    PREFIX=$(pwd)/android/$CPU
    x264=$(pwd)/x264/android/$CPU
    HOST=""
    CROSS_PREFIX=""
    SYSROOT=""
    ARCH=""
    if [ "$CPU" == "armv7-a" ]
    then
        ARCH="arm"
        HOST=arm-linux
        SYSROOT=$NDK/platforms/android-21/arch-arm/ 
        CROSS_PREFIX=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
    else
        ARCH="aarch64"
        HOST=aarch64-linux
        SYSROOT=$NDK/platforms/android-21/arch-arm64/
        CROSS_PREFIX=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-
    fi
    ./configure \
    --prefix=$PREFIX \
    --disable-encoders \
    --disable-decoders \
    --disable-avdevice \
    --disable-static \
    --disable-doc \
    --disable-ffplay \
    --disable-network \
    --disable-doc \
    --disable-symver \
    --enable-neon \
    --enable-shared \
    --enable-libx264 \
    --enable-gpl \
    --enable-pic \
    --enable-jni \
    --enable-pthreads \
    --enable-mediacodec \
    --enable-encoder=aac \
    --enable-encoder=gif \
    --enable-encoder=libopenjpeg \
    --enable-encoder=libmp3lame \
    --enable-encoder=libwavpack \
    --enable-encoder=libx264 \
    --enable-encoder=mpeg4 \
    --enable-encoder=pcm_s16le \
    --enable-encoder=png \
    --enable-encoder=srt \
    --enable-encoder=subrip \
    --enable-encoder=yuv4 \
    --enable-encoder=text \
    --enable-decoder=aac \
    --enable-decoder=aac_latm \
    --enable-decoder=libopenjpeg \
    --enable-decoder=mp3 \
    --enable-decoder=mpeg4_mediacodec \
    --enable-decoder=pcm_s16le \
    --enable-decoder=flac \
    --enable-decoder=flv \
    --enable-decoder=gif \
    --enable-decoder=png \
    --enable-decoder=srt \
    --enable-decoder=xsub \
    --enable-decoder=yuv4 \
    --enable-decoder=vp8_mediacodec \
    --enable-decoder=h264_mediacodec \
    --enable-decoder=hevc_mediacodec \
    --enable-hwaccel=h264_mediacodec \
    --enable-hwaccel=mpeg4_mediacodec \
    --enable-ffmpeg \
    --enable-bsf=aac_adtstoasc \
    --enable-bsf=h264_mp4toannexb \
    --enable-bsf=hevc_mp4toannexb \
    --enable-bsf=mpeg4_unpack_bframes \
    --enable-cross-compile \
    --cross-prefix=$CROSS_PREFIX \
    --target-os=android \
    --arch=$ARCH \
    --sysroot=$SYSROOT \
    --extra-cflags="-I$x264/include $ADDI_CFLAGS" \
    --extra-ldflags="-L$x264/lib"
}

build()
{
    make clean
    cpu=$1
    echo "build $cpu"
    
    configure $cpu
    make -j4
    make install
}

#build arm64
build armv7-a

注意脚本需要 chmod +x build.sh ，然后 sudo ./脚本执行

这个时候你执行完脚本，如果幸运，能拿到 so文件了

准备集成到 ndk android 源码中

创建 NDK 项目
源码libs 目录下导入 so
导入include文件
修改 build.gradle 文件
编辑CMake文件

cmake_minimum_required(VERSION 3.4.1)

set(lib_src_DIR ${CMAKE_SOURCE_DIR}/../../../libs/${ANDROID_ABI})

add_library(
        native-lib
        SHARED
        native-lib.cpp)

add_library(
        avcodec
        SHARED
        IMPORTED)

set_target_properties(
        avcodec
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libavcodec.so)

add_library(
        avfilter
        SHARED
        IMPORTED)

set_target_properties(
        avfilter
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libavfilter.so)

add_library(
        avformat
        SHARED
        IMPORTED)

set_target_properties(
        avformat
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libavformat.so)

add_library(
        avutil
        SHARED
        IMPORTED)
set_target_properties(
        avutil
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libavutil.so)

add_library(
        postproc
        SHARED
        IMPORTED)

set_target_properties(
        postproc
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libpostproc.so)

add_library(
        swresample
        SHARED
        IMPORTED)

set_target_properties(
        swresample
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libswresample.so)

add_library(
        swscale
        SHARED
        IMPORTED)

set_target_properties(
        swscale
        PROPERTIES IMPORTED_LOCATION
        ${lib_src_DIR}/libswscale.so)

find_library(
        log-lib
        log)

include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include)

target_link_libraries(
        native-lib
        avcodec
        avfilter
        avformat
        avutil
        postproc
        swresample
        swscale
        ${log-lib})

修改原来的 natice-lib.cpp 文件

#include <jni.h>
#include <string>
#include <android/log.h>
extern "C" {
#include "include/libavcodec/avcodec.h"
#include "include/libavfilter/avfilter.h"
#include "include/libavformat/avformat.h"
#include "include/libavutil/imgutils.h"
#include "include/libswresample/swresample.h"
#include "include/libswscale/swscale.h"
#include "include/libx264/x264.h"
}
extern "C"
JNIEXPORT jstring JNICALL
Java_com_wmtc_ndktest_MainActivity_stringFromFFmpeg(
        JNIEnv *env,
        jobject /* this */) {
    char info[10000] = {0};
    sprintf(info, "%s\n", avcodec_configuration());
    return env->NewStringUTF(info);
}

OK。调用，执行，不出意外看到如下：
在这里插入图片描述

遇到的问题

ninja: error: xxxxxx missing and no known rule to make it
因为你的 CMake文件错误，检查一下

undefined reference to 'avcodec_configuration()'
看看是否 extern "C"是这样导入的源码文件

extern "C" {
   #include "include/libavcodec/avcodec.h"
   #include "include/libavfilter/avfilter.h"
   #include "include/libavformat/avformat.h"
   #include "include/libavutil/imgutils.h"
   #include "include/libswresample/swresample.h"
   #include "include/libswscale/swscale.h"
   #include "include/libx264/x264.h"
   }

感谢一下文章提供的帮助：

编译相关文章

标签：enable,CMake,lib,FFmepg,decoder,linux,Android,include,android
来源： https://blog.csdn.net/qq_16666847/article/details/94443134