This example uses the combined libffmpeg library. Please refer to the previous practice The practice of compiling ffmpeg into a single library on android platform

Catalog

• Configuration environment
• New hello project

Configuration environment

Operating system: ubuntu 16.05

Note: the compilation of ffmpeg library uses android-ndk-r10e version, which will result in errors

In Android studio project, the version used with cmake is android-ndk-r16b

New project ffmpeg single hello

• Configure build.gradle as follows

android {
    ......
    defaultConfig {
        ......
        externalNativeBuild {
            cmake {
                cppFlags ""
            }
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
        sourceSets {
            main {
                //Library address
                jniLibs.srcDirs = ['libs']
            }
        }
    }
    ......
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

• Create a new CMakeLists.txt file with the following configuration

cmake_minimum_required(VERSION 3.4.1)

add_library(ffmpeg-hello
           SHARED
           src/main/cpp/ffmpeg_hello.c)

find_library(log-lib
            log)

#Get the path of the parent directory
get_filename_component(PARENT_DIR ${CMAKE_SOURCE_DIR} PATH)
set(LIBRARY_DIR ${PARENT_DIR}/ffmpeg-single)

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

add_library(ffmpeg-single
           SHARED
           IMPORTED)

set_target_properties(ffmpeg-single
                    PROPERTIES IMPORTED_LOCATION
                    ${LIBRARY_DIR}/libs/${ANDROID_ABI}/libffmpeg.so
                    )

#Include header file
include_directories(${LIBRARY_DIR}/libs/${ANDROID_ABI}/include)

target_link_libraries(ffmpeg-hello ffmpeg-single ${log-lib})

• New class ffmpeg hello.java

package com.onzhou.ffmpeg.hello;

public class FFmpegHello {

    static {
        System.loadLibrary("ffmpeg");
        System.loadLibrary("ffmpeg-hello");
    }

    public native String urlprotocolinfo();

    public native String avformatinfo();

    public native String avcodecinfo();

    public native String avfilterinfo();

    public native String configurationinfo();

}

• Create a new source file ffmpeg? Hello. C in src/main/cpp directory

#include <jni.h>
#include <stdio.h>
#include <time.h>
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavfilter/avfilter.h"
#include "libavutil/log.h"

#ifdef ANDROID
#include <android/log.h>
#define LOG_TAG    "FFmpegHello"
#define LOGE(format， ...)  __android_log_print(ANDROID_LOG_ERROR， LOG_TAG， format， ##__VA_ARGS__)
#define LOGI(format， ...)  __android_log_print(ANDROID_LOG_INFO，  LOG_TAG， format， ##__VA_ARGS__)
#else
#define LOGE(format， ...)  printf(LOG_TAG format "\n"， ##__VA_ARGS__)
#define LOGI(format， ...)  printf(LOG_TAG format "\n"， ##__VA_ARGS__)
#endif

JNIEXPORT jstring JNICALL Java_com_onzhou_ffmpeg_hello_FFmpegHello_urlprotocolinfo
  (JNIEnv * env， jobject obj){

    char info[40000]={0};
	av_register_all();

	struct URLProtocol *pup = NULL;
	//input
	struct URLProtocol **p_temp = &pup;
	avio_enum_protocols((void **)p_temp， 0);
	while ((*p_temp) != NULL){
		sprintf(info， "%s[in ][%10s]\n"， info， avio_enum_protocols((void **)p_temp， 0));
	}
	pup = NULL;
	//output
	avio_enum_protocols((void **)p_temp， 1);
	while ((*p_temp) != NULL){
		sprintf(info， "%s[out][%10s]\n"， info， avio_enum_protocols((void **)p_temp， 1));
	}
	LOGE("%s"， info);
	return (*env)->NewStringUTF(env， info);
}


JNIEXPORT jstring JNICALL Java_com_onzhou_ffmpeg_hello_FFmpegHello_avformatinfo
  (JNIEnv * env， jobject obj){

    char info[40000] = { 0 };

	av_register_all();

	AVInputFormat *if_temp = av_iformat_next(NULL);
	AVOutputFormat *of_temp = av_oformat_next(NULL);
	//input
	while(if_temp!=NULL){
		sprintf(info， "%s[in ][%10s]\n"， info， if_temp->name);
		if_temp=if_temp->next;
	}
	//output
	while (of_temp != NULL){
		sprintf(info， "%s[out][%10s]\n"， info， of_temp->name);
		of_temp = of_temp->next;
	}
	LOGE("%s"， info);
	return (*env)->NewStringUTF(env， info);
}


JNIEXPORT jstring JNICALL Java_com_onzhou_ffmpeg_hello_FFmpegHello_avcodecinfo
  (JNIEnv * env， jobject obj){

    char info[40000] = { 0 };

	av_register_all();

	AVCodec *c_temp = av_codec_next(NULL);

	while(c_temp!=NULL){
		if (c_temp->decode!=NULL){
			sprintf(info， "%s[dec]"， info);
		}
		else{
			sprintf(info， "%s[enc]"， info);
		}
		switch (c_temp->type){
		case AVMEDIA_TYPE_VIDEO:
			sprintf(info， "%s[video]"， info);
			break;
		case AVMEDIA_TYPE_AUDIO:
			sprintf(info， "%s[audio]"， info);
			break;
		default:
			sprintf(info， "%s[other]"， info);
			break;
		}
		sprintf(info， "%s[%10s]\n"， info， c_temp->name);

		c_temp=c_temp->next;
	}
	LOGE("%s"， info);
	return (*env)->NewStringUTF(env， info);
}

JNIEXPORT jstring JNICALL Java_com_onzhou_ffmpeg_hello_FFmpegHello_avfilterinfo
  (JNIEnv * env， jobject obj){

    char info[40000] = { 0 };

	avfilter_register_all();

	AVFilter *f_temp = (AVFilter *)avfilter_next(NULL);
	while (f_temp != NULL){
		sprintf(info， "%s[%10s]\n"， info， f_temp->name);
	}
	LOGE("%s"， info);
	return (*env)->NewStringUTF(env， info);
}


JNIEXPORT jstring JNICALL Java_com_onzhou_ffmpeg_hello_FFmpegHello_configurationinfo
  (JNIEnv * env， jobject obj){

    char info[10000] = { 0 };
	av_register_all();

	sprintf(info， "%s\n"， avcodec_configuration());

	LOGE("%s"， info);
	return (*env)->NewStringUTF(env， info);
}

• Compile, package and run, and output the following information:

Project address:
https://github.com/byhook/ffmpeg4android

Reference resources:
https://blog.csdn.net/leixiaohua1020/article/details/47008825