FFmepg编译及CMake 集成到 Android

FFmepg编译及集成到 Android

1. 编译文件修改
2. 打包so 执行
3. 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）

1. 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)' 
   

2. 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
       make -j4
       make install
   }
   
   #build arm64
   build armv7-a
   
   

3. 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

1. 创建 NDK 项目
2. 源码libs 目录下导入 so
   
3. 导入include文件
   
4. 修改 build.gradle 文件
   
5. 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})

6. 修改原来的 natice-lib.cpp 文件
   

#include 
#include 
#include 
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：

遇到的问题

1. ninja: error: xxxxxx missing and no known rule to make it
   因为你的 CMake文件错误，检查一下
2. 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 ：

1. 编译相关文章