NDK20b FFmpeg4.2.2 编译和集成

发布日期:2023-07-29

NDK20b FFmpeg4.2.2 编译和集成

  • 1 ffmpeg
  • 2 NDK20b
  • 3 build_android.sh
  • 4 FFmpeg 集成

1 ffmpeg

wget https://ffmpeg.org/releases/ffmpeg-4.2.2.tar.bz2 --no-check-certificate tar -jxvf ffmpeg-4.2.2.tar.bz2 

2 NDK20b

 wget https://dl.google.com/android/repository/android-ndk-r20b-linux-x86_64.zip  unizp android-ndk-r20b-linux-x86_64.zip 

3 build_android.sh

#!/bin/bash  export NDK=/root/workspace/android-ndk-r20b #这里先配置你的 NDK 路径 TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64   function build_android {  ./configure \ --prefix=$PREFIX \ --enable-neon  \ --enable-hwaccels  \ --enable-gpl   \ --disable-postproc \ --disable-debug \ --enable-small \ --enable-jni \ --enable-mediacodec \ --enable-decoder=h264_mediacodec \ --enable-static \ --enable-shared \ --disable-doc \ --enable-ffmpeg \ --disable-ffplay \ --disable-ffprobe \ --disable-avdevice \ --disable-doc \ --disable-symver \ --cross-prefix=$CROSS_PREFIX \ --target-os=android \ --arch=$ARCH \ --cpu=$CPU \ --cc=$CC \ --cxx=$CXX \ --enable-cross-compile \ --sysroot=$SYSROOT \ --extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \ --extra-ldflags="$ADDI_LDFLAGS"  make clean make -j16 make install  echo "============================ build android arm64-v8a success =========================="  }  #arm64-v8a ARCH=arm64 CPU=armv8-a API=21 CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang   SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-march=$CPU"  build_android  

./build_android.sh
编译成功后会有 android 静态库和动态库在目录下生成六个模块。

另外,如果要编译成 32 需要修改相应的编译脚本:

#armv7-a ARCH=arm CPU=armv7-a API=21 CC=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang CXX=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang   SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "  

4 FFmpeg 集成

基于上节编译 FFmpeg 我们在静态库 Android Studio 简单的集成测试。
在这里插入图片描述如上图所示,我们可以将它们放在一边 FFmpeg 将每个模块的静态库和头文件放置在指定目录下,以获取每个模块的版本信息 jni 。

#include  #include  #include "util/LogUtil.h" #include "jni.h"  //由于 FFmpeg 库是 C 语言实现,告诉编译按照 C 编译规则 extern "C" { #include  #include  #include  #include  #include  #include  #include  };  #ifdef __cplusplus extern "C" { #endif /*  * Class:     com_byteflow_learnffmpeg_media_FFMediaPlayer  * Method:    native_GetFFmpegVersion  * Signature: ()Ljava/lang/String;  */ JNIEXPORT jstring JNICALL Java_com_byteflow_learnffmpeg_media_FFMediaPlayer_native_1GetFFmpegVersion         (JNIEnv *env, jclass cls) {     char strBuffer[1024 * 4] = {0};     strcat(strBuffer, "libavcodec : ");     strcat(strBuffer, AV_STRINGIFY(LIBAVCODEC_VERSION));     strcat(strBuffer, "\nlibavformat : ");     strcat(strBuffer, AV_STRINGIFY(LIBAVFORMAT_VERSION));     strcat(strBuffer, "\nlibavutil : ");     strcat(strBuffer, AV_STRINGIFY(LIBAVUTIL_VERSION));     strcat(strBuffer, "\nlibavfilter : ");     strcat(strBuffer, AV_STRINGIFY(LIBAVFILTER_VERSION));     strcat(strBuffer, "\nlibswresample : ");     strcat(strBuffer, AV_STRINGIFY(LIBSWRESAMPLE_VERSION));     strcat(strBuffer, "\nlibswscale : ");     strcat(strBuffer, AV_STRINGIFY(LIBSWSCALE_VERSION));     strcat(strBuffer, "\navcodec_configure : \n");     strcat(strBuffer, avcodec_configuration());     strcat(strBuffer, "\navcodec_license : ");     strcat(strBuffer, avcodec_license());     LOGCATE("GetFFmpegVersion\n%s", strBuffer);     return env->NewStringUTF(strBuffer); }  #ifdef __cplusplus } #endif  

Java 层调用逻辑:

package com.byteflow.learnffmpeg.media;  public class FFMediaPlayer {     static {         System.loadLibrary("learn-ffmpeg");     }      public static String GetFFmpegVersion() {         return native_GetFFmpegVersion();     }      privae static native String native_GetFFmpegVersion();
}

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ((TextView)findViewById(R.id.text_view)).setText(FFMediaPlayer.GetFFmpegVersion());
    }
}

CMakeLists.txt 构建脚本:

# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")

set(jnilibs ${CMAKE_SOURCE_DIR}/../jniLibs)
set(libname learn-ffmpeg)

include_directories(
        include
        ${CMAKE_SOURCE_DIR}/util
)

link_directories(
        ${jnilibs}/${ANDROID_ABI})

file(GLOB src-files
        ${CMAKE_SOURCE_DIR}/*.cpp)

add_library( # Sets the name of the library.
             ${libname}

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             ${src-files}
        )

set(third-party-libs
        avformat
        avcodec
        avfilter
        swresample
        swscale
        avutil
        )

set(native-libs
        android
        EGL
        GLESv3
        OpenSLES
        log
        m
        z
        )

target_link_libraries( # Specifies the target library.
                       ${libname}

                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib}
                       ${third-party-libs}
                       ${native-libs}
                       )

编译完成后,运行 App 获取 FFmpeg 各个模块版本和编译配置信息。

https://blog.csdn.net/leixiaohua1020
https://juejin.im/post/5e1eace16fb9a02fec66474e

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