四、ffmpeg移植Android，并写一个demo，另附源码
作者：互联网
一、新建一个android项目
(1)、新建项目，选择native C++
二、配置android项目
(1)、将编译后的so文件和include文件放到lib目录下
如何编译ffmpeg for Android，青查看上一篇：三、Mac编译ffmpeg for Android
(2)、编辑CMakeLists.txt，代码放出如下
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# 定义变量
set(distribution_DIR ../../../../libs)
# 添加库——自己编写的库
# 库名称：native-lib
# 库类型：SHARED，表示动态库，后缀为.so（如果是STATIC，则表示静态库，后缀为.a）
# 库源码文件：src/main/cpp/native-lib.cpp
add_library( native-lib
SHARED
native-lib.cpp )
# 添加库——外部引入的库
# 库名称：avcodec（不需要包含前缀lib）
# 库类型：SHARED，表示动态库，后缀为.so（如果是STATIC，则表示静态库，后缀为.a）
# IMPORTED表明是外部引入的库
add_library( avcodec
SHARED
IMPORTED)
# 设置目标属性
# 设置avcodec目标库的IMPORTED_LOCATION属性，用于说明引入库的位置
# 还可以设置其他属性，格式：PROPERTIES key value
set_target_properties( avcodec
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libavcodec.so)
find_library(
log-lib
log)
add_library( avfilter
SHARED
IMPORTED)
set_target_properties( avfilter
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libavfilter.so)
add_library( avformat
SHARED
IMPORTED)
set_target_properties( avformat
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libavformat.so)
add_library( avutil
SHARED
IMPORTED)
set_target_properties( avutil
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libavutil.so)
add_library( swresample
SHARED
IMPORTED)
set_target_properties( swresample
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libswresample.so)
add_library( swscale
SHARED
IMPORTED)
set_target_properties( swscale
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libswscale.so)
# 引入头文件
include_directories(../../../libs/include)
# 告诉编译器生成native-lib库需要链接的库
# native-lib库需要依赖avcodec、avfilter等库
target_link_libraries( native-lib
avcodec
avfilter
avformat
avutil
swresample
swscale
-landroid
${log-lib} )说明：set(distribution_DIR ../../../../libs)目录为什么加./../../../，因为/ffmpegDemo/app/.externalNativeBuild/cmake/debug/armeabi-v7a为原始目录，如下图
include_directories(../../../libs/include)，以ffmpegDemo/app/src/main/cpp为原始目录，如下图
(3)、编辑build.gradle，代码放出如下
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.gui.ffmpegdemo"
minSdkVersion 19
targetSdkVersion 29
versionCode 1
versionName "1.0"
multiDexEnabled true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
// cppFlags ""
cppFlags "-frtti -fexceptions -Wno-deprecated-declarations"
// abiFilters 'armeabi'//, 'x86', 'armeabi-v7a', 'x86_64', 'arm64-v8a'
}
ndk{
abiFilters "armeabi-v7a"
}
}
sourceSets {
main {
jniLibs.srcDirs = ['libs']
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
// version "3.10.2"
// path "CMakeLists.txt"
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.tencent.bugly:crashreport:latest.release'
compile 'pub.devrel:easypermissions:0.2.1'
// implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
(4)、编辑native-lib.cpp，代码放出如下
#include <jni.h>
#include <string>
extern "C"
{
#include <android/native_window_jni.h>
#include <libavfilter/avfilter.h>
#include <libavcodec/avcodec.h>
//封装格式处理
#include <libavformat/avformat.h>
//像素处理
#include <libswscale/swscale.h>
#include <unistd.h>
JNIEXPORT void JNICALL
Java_com_gui_ffmpegdemo_FFVideoPlayer_render(JNIEnv *env, jobject instance, jstring url_,
jobject surface) {
const char *url = env->GetStringUTFChars(url_, 0);
// 注册。
av_register_all();
// 打开地址并且获取里面的内容 avFormatContext是内容的一个上下文
AVFormatContext *avFormatContext = avformat_alloc_context();
avformat_open_input(&avFormatContext, url, NULL, NULL);
avformat_find_stream_info(avFormatContext, NULL);
// 找出视频流
int video_index = -1;
for (int i = 0; i < avFormatContext->nb_streams; ++i) {
if (avFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
video_index = i;
}
}
// 解码 转换 绘制
// 获取解码器上下文
AVCodecContext *avCodecContext = avFormatContext->streams[video_index]->codec;
// 获取解码器
AVCodec *avCodec = avcodec_find_decoder(avCodecContext->codec_id);
// 打开解码器
if (avcodec_open2(avCodecContext, avCodec, NULL) < 0) {
// 打开失败。
return;
}
// 申请AVPacket和AVFrame，
// 其中AVPacket的作用是：保存解码之前的数据和一些附加信息，如显示时间戳（pts）、解码时间戳（dts）、数据时长，所在媒体流的索引等；
// AVFrame的作用是：存放解码过后的数据。
AVPacket *avPacket = (AVPacket *) av_malloc(sizeof(AVPacket));
av_init_packet(avPacket);
// 分配一个AVFrame结构体,AVFrame结构体一般用于存储原始数据，指向解码后的原始帧
AVFrame *avFrame = av_frame_alloc();
//分配一个AVFrame结构体，指向存放转换成rgb后的帧
AVFrame *rgb_frame = av_frame_alloc();
// rgb_frame是一个缓存区域，所以需要设置。
// 缓存区
uint8_t *out_buffer = (uint8_t *) av_malloc(
avpicture_get_size(AV_PIX_FMT_RGBA, avCodecContext->width, avCodecContext->height));
// 与缓存区相关联，设置rgb_frame缓存区
avpicture_fill((AVPicture *) rgb_frame, out_buffer, AV_PIX_FMT_RGBA, avCodecContext->width,
avCodecContext->height);
// 原生绘制，需要ANativeWindow
ANativeWindow *pANativeWindow = ANativeWindow_fromSurface(env, surface);
if (pANativeWindow == 0) {
// 获取native window 失败
return;
}
SwsContext *swsContext = sws_getContext(
avCodecContext->width,
avCodecContext->height,
avCodecContext->pix_fmt,
avCodecContext->width,
avCodecContext->height,
AV_PIX_FMT_RGBA,
SWS_BICUBIC,
NULL,
NULL,
NULL);
// 视频缓冲区
ANativeWindow_Buffer native_outBuffer;
// 开始解码了。
int frameCount;
while (av_read_frame(avFormatContext, avPacket) >= 0) {
if (avPacket->stream_index == video_index) {
avcodec_decode_video2(avCodecContext, avFrame, &frameCount, avPacket);
// 当解码一帧成功过后，我们转换成rgb格式并且绘制。
if (frameCount) {
ANativeWindow_setBuffersGeometry(pANativeWindow, avCodecContext->width,
avCodecContext->height, WINDOW_FORMAT_RGBA_8888);
// 上锁
ANativeWindow_lock(pANativeWindow, &native_outBuffer, NULL);
// 转换为rgb格式
sws_scale(swsContext, (const uint8_t *const *) avFrame->data, avFrame->linesize, 0,
avFrame->height, rgb_frame->data, rgb_frame->linesize);
uint8_t *dst = (uint8_t *) native_outBuffer.bits;
int destStride = native_outBuffer.stride * 4;
uint8_t *src = rgb_frame->data[0];
int srcStride = rgb_frame->linesize[0];
for (int i = 0; i < avCodecContext->height; ++i) {
memcpy(dst + i * destStride, src + i * srcStride, srcStride);
}
ANativeWindow_unlockAndPost(pANativeWindow);
// usleep(1000 * 16);
}
}
av_free_packet(avPacket);
}
ANativeWindow_release(pANativeWindow);
av_frame_free(&avFrame);
av_frame_free(&rgb_frame);
avcodec_close(avCodecContext);
avformat_free_context(avFormatContext);
env->ReleaseStringUTFChars(url_, url);
}
JNIEXPORT jstring JNICALL
Java_com_gui_ffmpegdemo_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
JNIEXPORT jstring JNICALL
Java_com_gui_ffmpegdemo_MainActivity_urlprotocolinfo(JNIEnv *env, jobject instance) {
char info[40000] = {0};
av_register_all();
struct URLProtocol *pup = NULL;
struct URLProtocol **p_temp = &pup;
avio_enum_protocols((void **) p_temp, 0);
while ((*p_temp) != NULL) {
sprintf(info, "%sInput: %s\n", info, avio_enum_protocols((void **) p_temp, 0));
}
pup = NULL;
avio_enum_protocols((void **) p_temp, 1);
while ((*p_temp) != NULL) {
sprintf(info, "%sInput: %s\n", info, avio_enum_protocols((void **) p_temp, 1));
}
return env->NewStringUTF(info);
}
JNIEXPORT jstring JNICALL
Java_com_gui_ffmpegdemo_MainActivity_avformatinfo(JNIEnv *env, jobject instance) {
char info[40000] = {0};
av_register_all();
AVInputFormat *if_temp = av_iformat_next(NULL);
AVOutputFormat *of_temp = av_oformat_next(NULL);
while (if_temp != NULL) {
sprintf(info, "%sInput: %s\n", info, if_temp->name);
if_temp = if_temp->next;
}
while (of_temp != NULL) {
sprintf(info, "%sOutput: %s\n", info, of_temp->name);
of_temp = of_temp->next;
}
return env->NewStringUTF(info);
}
JNIEXPORT jstring JNICALL
Java_com_gui_ffmpegdemo_MainActivity_avcodecinfo(JNIEnv *env, jobject instance) {
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, "%sdecode:", info);
} else {
sprintf(info, "%sencode:", 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;
}
return env->NewStringUTF(info);
}
JNIEXPORT jstring JNICALL
Java_com_gui_ffmpegdemo_MainActivity_avfilterinfo(JNIEnv *env, jobject instance) {
char info[40000] = {0};
avfilter_register_all();
AVFilter *f_temp = (AVFilter *) avfilter_next(NULL);
while (f_temp != NULL) {
sprintf(info, "%s%s\n", info, f_temp->name);
f_temp = f_temp->next;
}
return env->NewStringUTF(info);
}
}三、实现视频播放
package com.gui.ffmpegdemo;
import android.Manifest;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.view.View;
import java.util.List;
import pub.devrel.easypermissions.EasyPermissions;
public class MainActivity extends Activity implements View.OnClickListener , EasyPermissions.PermissionCallbacks{
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
}
TextView tvInfo;
private FFVideoPlayer mPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btn_protocol).setOnClickListener(this);
findViewById(R.id.btn_codec).setOnClickListener(this);
findViewById(R.id.btn_filter).setOnClickListener(this);
findViewById(R.id.btn_format).setOnClickListener(this);
findViewById(R.id.btn_player).setOnClickListener(this);
mPlayer = findViewById(R.id.ffVideoPlayer);
tvInfo = findViewById(R.id.tv_info);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_protocol:
tvInfo.setText(urlprotocolinfo());
break;
case R.id.btn_format:
tvInfo.setText(avformatinfo());
break;
case R.id.btn_codec:
tvInfo.setText(avcodecinfo());
break;
case R.id.btn_filter:
tvInfo.setText(avfilterinfo());
break;
case R.id.btn_player:
mPlayer.play("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
break;
default:
break;
}
}
public native String stringFromJNI();
public native String urlprotocolinfo();
public native String avformatinfo();
public native String avcodecinfo();
public native String avfilterinfo();
private void initEasypermissions() {
String[] permissions = {
Manifest.permission.SYSTEM_ALERT_WINDOW,
Manifest.permission.CAMERA,
Manifest.permission.WRITE_SETTINGS,
Manifest.permission.READ_PHONE_STATE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.VIBRATE,
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.ACCESS_WIFI_STATE,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION
};
if (!EasyPermissions.hasPermissions(this, permissions)) {
Log.e("Lyz", "..........requestPermissions................");
EasyPermissions.requestPermissions(this, "点击确定应用需要获取的权限", 101, permissions);
}
}
//成功
@Override
public void onPermissionsGranted(int requestCode, List<String> perms) {
if (perms != null && perms.size() > 0) {
for (int i = 0; i < perms.size(); i++) {
Log.e("Lyz", "...ok...perms......." + i + "....." + perms.get(i));
}
Log.e("Lyz", "..........onPermissionsGranted................");
if (EasyPermissions.hasPermissions(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)) {
}
}
}
//失败
@Override
public void onPermissionsDenied(int requestCode, List<String> perms) {
if (perms != null && perms.size() > 0) {
for (int i = 0; i < perms.size(); i++) {
Log.e("Lyz", "..faild....perms......." + i + "....." + perms.get(i));
}
Log.e("Lyz", "..........onPermissionsDenied................");
}
}
}
四、优秀项目推荐
FFmpeg In Android
贴几个比较好的Github项目
This project is a continued fork of FFmpeg Android Java by WritingMinds. This fork fixes the CANNOT LINK EXECUTABLE ffmpeg: has text relocations issue on x86 devices along with some other bugfixes, new features and the newest FFmpeg builds.
android端基于FFmpeg实现音频剪切、拼接、转码、混音、编解码；视频剪切、水印、截图、转码、编解码、转Gif动图、画面拼接、视频倒播；音视频合成与分离；音视频解码、同步与播放；FFmpeg本地推流、H264与RTMP实时推流直播；OpenGL+GPUImage实时滤镜；FFmpeg滤镜：素描、色彩平衡、hue、lut、模糊、九宫格等；基于IjkPlayer修改支持RTSP超低延时直播(局域网1080P延时130ms)、暂停、静音，多路投屏直播
android 读取摄像头和麦克风,使用rtmp推流
如果您在编译过程中遇到问题，欢迎添加QQ群：937088785 进行交流！
标签：info,avCodecContext,ffmpeg,temp,demo,..,源码,NULL,native 来源： https://blog.csdn.net/huangpeigui/article/details/113106855