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screen record example
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‎android/examples/screenrecord/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.4.1 FATAL_ERROR)
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set(NAME screenrecord)
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set(SRC_DIR ../../../examples/${NAME})
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set(BASE_DIR ../../../base)
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set(EXTERNAL_DIR ../../../external)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -DVK_USE_PLATFORM_ANDROID_KHR -DVK_NO_PROTOTYPES")
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file(GLOB EXAMPLE_SRC "${SRC_DIR}/*.cpp")
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add_library(native-lib SHARED ${EXAMPLE_SRC})
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add_library(native-app-glue STATIC ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
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add_subdirectory(../base ${CMAKE_SOURCE_DIR}/../base)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -u ANativeActivity_onCreate")
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include_directories(${BASE_DIR})
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include_directories(${EXTERNAL_DIR})
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include_directories(${EXTERNAL_DIR}/glm)
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include_directories(${EXTERNAL_DIR}/imgui)
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include_directories(${EXTERNAL_DIR}/tinygltf)
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include_directories(${ANDROID_NDK}/sources/android/native_app_glue)
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target_link_libraries(
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native-lib
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native-app-glue
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libbase
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android
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log
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z
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mediandk
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)

‎android/examples/screenrecord/README.md‎

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This example demonstrates video screen recording on Android by using AMediaCodec API
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0 Create codec surface AMediaCodec_createInputSurface
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1 Create Vulkan surface from codec surface
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2 Blit images from display surface to codec surface
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# How to retrieve and play the encoded file?
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```shell
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adb shell run-as de.saschawillems.vulkanScreenRecord cat video.h264 >video.h264
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ffplay video.h264
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```

‎android/examples/screenrecord/build.gradle‎

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apply plugin: 'com.android.application'
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apply from: '../gradle/outputfilename.gradle'
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android {
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compileSdkVersion rootProject.ext.compileSdkVersion
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defaultConfig {
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applicationId "de.saschawillems.vulkanScreenRecord"
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minSdkVersion 26 //AMediaCodec_createInputSurface was introduced in API 26
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targetSdkVersion rootProject.ext.targetSdkVersion
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versionCode 1
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versionName "1.0"
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ndk {
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abiFilters rootProject.ext.abiFilters
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}
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externalNativeBuild {
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cmake {
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cppFlags "-std=c++14"
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arguments "-DANDROID_STL=c++_shared", '-DANDROID_TOOLCHAIN=clang'
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}
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}
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}
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sourceSets {
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main.assets.srcDirs = ['assets']
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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externalNativeBuild {
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cmake {
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path "CMakeLists.txt"
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}
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}
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}
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task copyTask {
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copy {
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from '../../common/res/drawable'
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into "src/main/res/drawable"
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include 'icon.png'
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}
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copy {
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from rootProject.ext.shaderPath + 'glsl/base'
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into 'assets/shaders/glsl/base'
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include '*.spv'
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}
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copy {
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from rootProject.ext.shaderPath + 'glsl/screenshot'
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into 'assets/shaders/glsl/screenshot'
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include '*.*'
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}
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copy {
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from rootProject.ext.assetPath + 'models'
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into 'assets/models'
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include 'chinesedragon.gltf'
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}
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}
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preBuild.dependsOn copyTask

‎android/examples/screenrecord/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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<application
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android:label="Vulkan Video Screen Recorder"
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android:icon="@drawable/icon"
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android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
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<activity android:name="de.saschawillems.vulkanSample.VulkanActivity"
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android:screenOrientation="portrait"
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android:configChanges="orientation|keyboardHidden"
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android:exported="true">
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<meta-data android:name="android.app.lib_name"
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android:value="native-lib" />
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
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<uses-feature android:name="android.hardware.gamepad" android:required="false" />
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</manifest>

‎android/examples/screenrecord/src/main/java/de/saschawillems/vulkanSample/VulkanActivity.java‎

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/*
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* Copyright (C) 2018 by Sascha Willems - www.saschawillems.de
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*
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* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
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*/
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package de.saschawillems.vulkanSample;
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import android.app.AlertDialog;
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import android.app.NativeActivity;
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import android.content.DialogInterface;
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import android.content.pm.ApplicationInfo;
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import android.os.Bundle;
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import java.util.concurrent.Semaphore;
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public class VulkanActivity extends NativeActivity {
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static {
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// Load native library
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System.loadLibrary("native-lib");
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}
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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}
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// Use a semaphore to create a modal dialog
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private final Semaphore semaphore = new Semaphore(0, true);
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public void showAlert(final String message)
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{
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final VulkanActivity activity = this;
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ApplicationInfo applicationInfo = activity.getApplicationInfo();
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final String applicationName = applicationInfo.nonLocalizedLabel.toString();
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this.runOnUiThread(new Runnable() {
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public void run() {
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AlertDialog.Builder builder = new AlertDialog.Builder(activity, android.R.style.Theme_Material_Dialog_Alert);
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builder.setTitle(applicationName);
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builder.setMessage(message);
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builder.setPositiveButton("Close", new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog, int id) {
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semaphore.release();
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}
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});
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builder.setCancelable(false);
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AlertDialog dialog = builder.create();
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dialog.show();
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}
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});
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try {
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semaphore.acquire();
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}
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catch (InterruptedException e) { }
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}
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}

‎examples/screenrecord/codecutils.cpp‎

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#include "codecutils.h"
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const char *amErrorString(media_status_t status) {
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/** The requested media operation completed successfully. */
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switch (status) {
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case AMEDIA_OK:
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return "AMEDIA_OK";
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case AMEDIACODEC_ERROR_INSUFFICIENT_RESOURCE:
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return "AMEDIACODEC_ERROR_INSUFFICIENT_RESOURCE";
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case AMEDIACODEC_ERROR_RECLAIMED:
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return "AMEDIACODEC_ERROR_RECLAIMED";
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case AMEDIA_ERROR_UNKNOWN:
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return "AMEDIA_ERROR_UNKNOWN";
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case AMEDIA_ERROR_MALFORMED:
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return "AMEDIA_ERROR_MALFORMED";
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case AMEDIA_ERROR_UNSUPPORTED:
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return "AMEDIA_ERROR_UNSUPPORTED";
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case AMEDIA_ERROR_INVALID_OBJECT:
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return "AMEDIA_ERROR_INVALID_OBJECT";
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case AMEDIA_ERROR_INVALID_PARAMETER:
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return "AMEDIA_ERROR_INVALID_PARAMETER";
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case AMEDIA_ERROR_INVALID_OPERATION:
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return "AMEDIA_ERROR_INVALID_OPERATION";
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case AMEDIA_ERROR_END_OF_STREAM:
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return "AMEDIA_ERROR_END_OF_STREAM";
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case AMEDIA_ERROR_IO:
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return "AMEDIA_ERROR_IO";
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case AMEDIA_ERROR_WOULD_BLOCK:
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return "AMEDIA_ERROR_WOULD_BLOCK";
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case AMEDIA_DRM_ERROR_BASE:
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return "AMEDIA_DRM_ERROR_BASE";
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case AMEDIA_DRM_NOT_PROVISIONED:
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return "AMEDIA_DRM_NOT_PROVISIONED";
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case AMEDIA_DRM_RESOURCE_BUSY:
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return "AMEDIA_DRM_RESOURCE_BUSY";
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case AMEDIA_DRM_DEVICE_REVOKED:
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return "AMEDIA_DRM_DEVICE_REVOKED";
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case AMEDIA_DRM_SHORT_BUFFER:
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return "AMEDIA_DRM_SHORT_BUFFER";
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case AMEDIA_DRM_SESSION_NOT_OPENED:
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return "AMEDIA_DRM_SESSION_NOT_OPENED";
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case AMEDIA_DRM_TAMPER_DETECTED:
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return "AMEDIA_DRM_TAMPER_DETECTED";
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case AMEDIA_DRM_VERIFY_FAILED:
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return "AMEDIA_DRM_VERIFY_FAILED";
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case AMEDIA_DRM_NEED_KEY:
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return "AMEDIA_DRM_NEED_KEY";
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case AMEDIA_DRM_LICENSE_EXPIRED:
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return "AMEDIA_DRM_LICENSE_EXPIRED";
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case AMEDIA_IMGREADER_ERROR_BASE:
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return "AMEDIA_IMGREADER_ERROR_BASE";
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case AMEDIA_IMGREADER_NO_BUFFER_AVAILABLE:
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return "AMEDIA_IMGREADER_NO_BUFFER_AVAILABLE";
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case AMEDIA_IMGREADER_MAX_IMAGES_ACQUIRED:
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return "AMEDIA_IMGREADER_MAX_IMAGES_ACQUIRED";
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case AMEDIA_IMGREADER_CANNOT_LOCK_IMAGE:
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return "AMEDIA_IMGREADER_CANNOT_LOCK_IMAGE";
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case AMEDIA_IMGREADER_CANNOT_UNLOCK_IMAGE:
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return "AMEDIA_IMGREADER_CANNOT_UNLOCK_IMAGE";
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case AMEDIA_IMGREADER_IMAGE_NOT_LOCKED:
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return "AMEDIA_IMGREADER_IMAGE_NOT_LOCKED";
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}
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return "UNKNOWN";
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}

‎examples/screenrecord/codecutils.h‎

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#ifndef ANDROID_CODECUTILS_H
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#define ANDROID_CODECUTILS_H
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#include "VulkanAndroid.h"
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#include <media/NdkMediaCodec.h>
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static constexpr int COLOR_FormatSurface = 0x7F000789;
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const char *amErrorString(media_status_t status);
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#define AM_CHECK_RESULT(ctx, f) \
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{ \
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media_status_t res = (f); \
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if (res != AMEDIA_OK) \
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{ \
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LOGE("Fatal : %s \"%s\" in %s at line %d", ctx, amErrorString(res), __FILE__, __LINE__);\
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} else { \
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LOGI("OK : %s \"%s\" in %s at line %d", ctx, amErrorString(res), __FILE__, __LINE__); \
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} \
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}
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#define AM_CHECK_RESULT_ERR(ctx, f) \
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{ \
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media_status_t res = (f); \
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if (res != AMEDIA_OK) \
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{ \
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LOGE("Fatal : %s \"%s\" in %s at line %d", ctx, amErrorString(res), __FILE__, __LINE__);\
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} \
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}
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#endif //ANDROID_CODECUTILS_H

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