Unity录屏实现（一）

几天前下载到一个安卓工程，可以把图片合成视频，突然想开坑做一个Unity录屏功能，然后就开始了。

Android代码：

package cn.net.xuefei.unityrec;import static com.googlecode.javacv.cpp.opencv_highgui.cvLoadImage;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;import com.googlecode.javacv.FFmpegFrameRecorder;
import com.googlecode.javacv.FrameRecorder.Exception;
import com.googlecode.javacv.cpp.opencv_core;
import com.unity3d.player.UnityPlayer;
import com.unity3d.player.UnityPlayerActivity;import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;public class MainActivity extends UnityPlayerActivity {private static MainActivity ma;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);ma = this;}public static void StartFusionVideo(final String videoName, final String frameCount, final String vidoeLength) {ma.runOnUiThread(new Runnable() {public void run() { //if (!isStarted()) {int fc = Integer.parseInt(frameCount);long vl = Long.parseLong(vidoeLength);start(videoName, fc, vl);}}});}public static void PauseFusionVideo() {pause();}public static void StopFusionVideo() {stop();}private static int switcher = 0;// 录像键private static boolean isPaused = false;// 暂停键private static String filename = null;public static int INDEX_MAX = 21;private static String filePathRoot = Environment.getExternalStorageDirectory()+ "/Android/data/cn.net.xuefei.unityrec/files/";private static Bitmap frame;private static Bitmap testBitmap;public static void start(final String videoName, final int frameCount, final long vidoeLength) {Log.e("start参数：", "videoName:" + videoName + " frameCount:" + frameCount + " vidoeLength:" + vidoeLength);INDEX_MAX = frameCount - 1;frame = Bitmap.createBitmap(1080, 1920, Bitmap.Config.RGB_565);testBitmap = Bitmap.createBitmap(1080, 1920, Bitmap.Config.RGB_565);switcher = 1;new Thread() {public void run() {OutputStream os = null;filename = videoName + ".mp4";testBitmap = getFrameBitmap(filePathRoot + "0.jpg");FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(filePathRoot + filename, 1080, 1920);recorder.setFormat("mp4");// recorder.setFrameRate(30f);//录像帧率Log.e("录像帧率 ", (frameCount / (vidoeLength / 1000)) + "");Log.e("录像时长 ", vidoeLength + "");Log.e("frameCount", frameCount + "");recorder.setFrameRate(frameCount / (vidoeLength / 1000));// 录像帧率// recorder.setTimestamp(vidoeLength);try {recorder.start();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}int index = 0;while (switcher != 0) {if (!isPaused) {File file = new File(filePathRoot + "video.jpg");if (!file.exists()) {file.getParentFile().mkdirs();try {file.createNewFile();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} else {file = new File(filePathRoot + "video.jpg");}try {os = new FileOutputStream(file);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}frame = getFrameBitmap(filePathRoot + index + ".jpg");frame.compress(Bitmap.CompressFormat.JPEG, 100, os);try {os.flush();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {os.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}// frame.recycle();// frame = null;opencv_core.IplImage image = cvLoadImage(filePathRoot + "video.jpg");try {recorder.record(image);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (index + 1 > INDEX_MAX) {// index = 1;try {recorder.stop();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}UnityPlayer.UnitySendMessage("UnityREC", "FusionOver", videoName);} else {index++;}try {recorder.stop();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}UnityPlayer.UnitySendMessage("UnityREC", "FusionOver", videoName);}}}.start();}public static void stop() {switcher = 0;isPaused = false;}public static void pause() {if (switcher == 1) {isPaused = true;}}public static void restart() {if (switcher == 1) {isPaused = false;}}public static boolean isStarted() {if (switcher == 1) {return true;} else {return false;}}public static boolean isPaused() {return isPaused;}static Bitmap image = null;private static Bitmap getFrameBitmap(String filename) {image = BitmapFactory.decodeFile(filename);return image;}
}

Unity代码：

using UnityEngine;
using System.Collections;
using System.IO;
using System;
using System.Diagnostics;
using System.Collections.Generic;public class UnityREC : MonoBehaviour
{Texture2D tex;int width;int height;Queue<byte[]> imageBytes = new Queue<byte[]>();bool isREC = false;int index = 0;private Rect CutRect = new Rect(0, 0, 1, 1);private RenderTexture rt;// Use this for initializationvoid Start(){width = Screen.width;height = Screen.height;tex = new Texture2D(width, height, TextureFormat.RGB24, false);rt = new RenderTexture(width, height, 2, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Default);Camera.main.pixelRect = new Rect(0, 0, width, height);Camera.main.targetTexture = rt;//StartCoroutine(StartREC());}// Update is called once per framevoid Update(){if (isREC && Time.time > nextFire){//StartCoroutine(StartREC());StartRec();}}float startTime = 0;float videoLength = 0;void OnGUI(){if (GUI.Button(new Rect(0, 0, 300, 300), "开始截屏")){if (isREC){isREC = false;videoLength = Time.time - startTime;return;}else{isREC = true;startTime = Time.time;index = 0;return;}}if (GUI.Button(new Rect(0, 300, 300, 300), "合成视频")){
#if UNITY_ANDROIDAndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");jo.CallStatic("StartFusionVideo", new object[] { DateTime.Now.ToFileTime().ToString(), index + "", Convert.ToInt32(videoLength * 1000).ToString() });
#elif  UNITY_IPHONE#endif}}void FixedUpdate(){if (imageBytes.Count > 0){File.WriteAllBytes(Application.persistentDataPath + "/" + index + ".jpg", imageBytes.Dequeue());index++;}}byte[] imagebytes;float fireRate = 0.02F;float nextFire = 0.0F;IEnumerator StartREC(){nextFire = Time.time + fireRate;yield return new WaitForEndOfFrame();tex.ReadPixels(new Rect(0, 0, width, height), 0, 0, false);//tex.Compress(false);//对屏幕缓存进行压缩 imagebytes = tex.EncodeToJPG(50);//转化为jpg图  //float t = Time.time;//Stopwatch sw = new Stopwatch();//sw.Start();//UnityEngine.Debug.Log(string.Format("total: {0} ms", Time.time - t));imageBytes.Enqueue(imagebytes);// sw.Stop();//UnityEngine.Debug.Log(string.Format("total: {0} ms", sw.ElapsedMilliseconds)); }void StartRec(){nextFire = Time.time + fireRate;float t = Time.time;Stopwatch sw = new Stopwatch();sw.Start();UnityEngine.Debug.Log(string.Format("total: {0} ms", Time.time - t));Camera.main.Render();RenderTexture.active = rt;tex.ReadPixels(new Rect(width * CutRect.x, width * CutRect.y, width * CutRect.width, height * CutRect.height), 0, 0);Camera.main.targetTexture = null;RenderTexture.active = null;imagebytes = tex.EncodeToJPG();imageBytes.Enqueue(imagebytes);sw.Stop();UnityEngine.Debug.Log(string.Format("total: {0} ms", sw.ElapsedMilliseconds));}public void FusionOver(string videoName){UnityEngine.Debug.Log("videoName:" + videoName);}}

现在的结果是，截图实现了，但是很卡……

卡到截取一帧耗时300多毫秒……

合成视频调用失败：

不知道万能的博友有什么建议……

点击这里下载工程

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