前言

一、导入AVpro插件

AVpro插件是一款很强大的视频播放插件，配合Unity使用有意想不到的效果，他的各项功能网上都有，我就不进行展开讨论了。
该插件的获取方式为AssetStore中购买下载，该插件有一个免费版本可供使用，付费版本的功能强大一点。
有需要的也可以私信我，我分享给你，你只能用于学习，不可用于商用。
在这里插入图片描述

将下载好的AVpro导入Unity。

二、插件对应的UI界面

在这里插入图片描述
图中显示视频的GUI主要是导入AVPro之后创建的，右键UI/AVproVideouGUI

在这里插入图片描述
在该GUI的Inspector窗口有一个Display uGui的组件，该组件中有一个MediaPlayer的选项，该选项是一个播放器，右键添加该播放器并且拉入到该位置。

三、创建ChangeVideo脚本

/****************************************************
    文件：ChangeVideo.cs
	作者：Mark
    日期：#CreateTime#
	功能：替换视频
*****************************************************/

using RenderHeads.Media.AVProVideo;
using System.Collections;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
public class ChangeVideo : MonoBehaviour 
{
    public Button changeVideoBtn;  //替换视频的按钮
    public MediaPlayer mediaPlayer;//AVpro的播放器
    public DisplayUGUI displayUGUI;//AVpro的UGUI
    private string savePath = Application.streamingAssetsPath + "/1.mp4";//视频加载后的保存位置
    private void Start()
    {
        changeVideoBtn.onClick.AddListener(onRead);//监听按钮是否点击，如果点击就执行打开窗口
    }
    private void onRead()
    {
        OpenFileName ofn = new OpenFileName();

        ofn.structSize = Marshal.SizeOf(ofn);

        ofn.filter = "视频文件(*.mp4*.mov)\0*.mp4;*.mov";

        ofn.file = new string(new char[256]);

        ofn.maxFile = ofn.file.Length;

        ofn.fileTitle = new string(new char[64]);

        ofn.maxFileTitle = ofn.fileTitle.Length;
        string path = Application.streamingAssetsPath;
        path = path.Replace('/', '\\');
        //默认路径
        ofn.initialDir = path;

        ofn.title = "选择需要替换的视频";

        ofn.defExt = "mp4";//显示文件的类型
                           //注意 一下项目不一定要全选 但是0x00000008项不要缺少
        ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR

        if (WindowDll.GetOpenFileName(ofn))
        {
            StartCoroutine(Download(ofn.file));
        }

    }
    IEnumerator Download(string url)
    {
        mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.RelativeToStreamingAssetsFolder, null, false);
        UnityWebRequest request = UnityWebRequest.Get(url);
        request.SendWebRequest();
        if (request.isHttpError || request.isNetworkError)
        {
            //print("当前的下载发生错误" + request.error);
            yield break;
        }
        while (!request.isDone)
        {
            //获取视频读取进度，有需要可以加入
            //print("当前的下载进度为：" + request.downloadProgress);
            //downloadProgress.text = (request.downloadProgress * 100).ToString() + "%";
            yield return 0;
        }
        if (request.isDone)
        {
            //downloadProgress.text = "100%";
            using (FileStream fs = new FileStream(savePath, FileMode.Create))
            {
                byte[] results = request.downloadHandler.data;
                fs.Write(results, 0, results.Length);
                fs.Flush();
                fs.Close();
            }
        }
        mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.RelativeToStreamingAssetsFolder, savePath, false);
        //加载成功后打开并且播放
        mediaPlayer.m_AutoOpen = true;
        mediaPlayer.Play();
    }

}

四、创建OpenFileName类用于打开窗口

/****************************************************
    文件：OpenFileName.cs
	作者：Mark
    日期：#CreateTime#
	功能：打开文件夹
*****************************************************/

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenFileName
{
    public int structSize = 0;
    public IntPtr dlgOwner = IntPtr.Zero;
    public IntPtr instance = IntPtr.Zero;
    public String filter = null;
    public String customFilter = null;
    public int maxCustFilter = 0;
    public int filterIndex = 0;
    public String file = null;
    public int maxFile = 0;
    public String fileTitle = null;
    public int maxFileTitle = 0;
    public String initialDir = null;
    public String title = null;
    public int flags = 0;
    public short fileOffset = 0;
    public short fileExtension = 0;
    public String defExt = null;
    public IntPtr custData = IntPtr.Zero;
    public IntPtr hook = IntPtr.Zero;
    public String templateName = null;
    public IntPtr reservedPtr = IntPtr.Zero;
    public int reservedInt = 0;
    public int flagsEx = 0;
}

public class WindowDll
{
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
    public static bool GetOpenFileName1([In, Out] OpenFileName ofn)
    {
        return GetOpenFileName(ofn);
    }
}