一、FFmpeg编译+集成

Learn from 大佬字节流动 👍 juejin.cn/post/684516…

本系列不是原創 为按照大佬教程实践出真知

//1. 下载 ffmpeg-4.2.2
wget https://ffmpeg.org/releases/ffmpeg-4.2.2.tar.bz2
//2. 解压 FFmpeg 
tar -jxvf ffmpeg-4.2.2.tar.bz2
//3. 配置项目
./configure --disable-x86asm

4. 创建 build_android_arm64-v8a_clang.sh 文件
    touch build_android_arm64-v8a_clang.sh

5. 编写脚本

 #!/bin/bash


export NDK=/home/chen/Downloads/android-ndk-r20b-linux-x86_64/android-ndk-r20b #这里配置先你的 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

 修改 build_android_arm64-v8a_clang.sh 可执行权限
chmod +x build_android_arm64-v8a_clang.sh
# 运行编译脚本
./build_android_arm64-v8a_clang.sh

Android项目集成

1. 在jniLibs 集成 静态库

2. 在cpp 中引入头文件

3. CmakeLists

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)

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

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

add_library(
        ${libname}
        SHARED
        ${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(
        ${libname}
        ${log-lib}
        ${third-party-libs}
        ${native-libs}
)

native-lib

#include <jni.h>
#include <string>
#include <cstdio>

//由于 FFmpeg 库是 C 语言实现的，告诉编译器按照 C 的规则进行编译
extern "C" {
#include <libavcodec/version.h>
#include <libavcodec/avcodec.h>
#include <libavformat/version.h>
#include <libavutil/version.h>
#include <libavfilter/version.h>
#include <libswresample/version.h>
#include <libswscale/version.h>
}


#ifdef __cplusplus
extern "C" {
#endif
JNIEXPORT jstring JNICALL Java_com_wardtn_ffmpegdemo_TestActivity_stringFromJNI
        (JNIEnv *env, jobject)
{
    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());
    return env->NewStringUTF(strBuffer);
}
#ifdef __cplusplus
}
#endif

over.