视频播放的进化（一）

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视频播放的进化（一）

ю意思я · 2010-05-28 · via 博客园 - ю意思я

　　1、基于Windows meida player的视频播放，应用于最早的EXPO项目内的视频播放：

VideoWindow

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MvcNetwork;
using log4net;
using NetworkHelper;
using ExpoSignageShare;
using System.Configuration;
using Helper;
using WMPLib;
using PlayModel;
using System.IO;namespace PlayApplication.MediaPlayers {
    public partial class VideoWindow : MediaWindow {
        static readonly ILog logger = LogManager.GetLogger(typeof(VideoWindow));private Delay delay;
        private EventHandler handler;
        private System.Timers.Timer videoTimer = new System.Timers.Timer(15);
        private System.Timers.Timer liveTimer = new System.Timers.Timer(15);
        private MediaItem item;public VideoWindow() {
            InitializeComponent();

axWindowsMediaPlayer1.settings.setMode(

"loop", false);
            videoTimer.Elapsed += (o1, e1) => {
                videoTimer.Stop();
                this.UIInvoke(() => {
                    axWindowsMediaPlayer1.Size = this.Size;
                    axWindowsMediaPlayer1.URL = Path.GetFullPath(item.LocalPath);
                });
            };
            liveTimer.Elapsed += (o1, e1) => {
                liveTimer.Stop();
                this.UIInvoke(() => {
                    axWindowsMediaPlayer1.Size = this.Size;
                    axWindowsMediaPlayer1.URL = item.LocalPath;
                });
                try {
                    if (item.Duration == 0) {
                        item.Duration = 5;
                        logger.Warn("Live Duration is 0");
                    }
                    delay = Delay.DelayExecute(new Duration { Seconds = item.Duration }, () => {
                        if (handler != null) { handler(this, EventArgs.Empty); }
                    });
                    delay.Start();
                } catch (Exception ex) {
                    logger.Warn(ex);
                    if (handler != null) { handler(this, EventArgs.Empty); }
                }
            };
        }public VideoWindow(bool arg)
            : this() {
            if (arg) {
                axWindowsMediaPlayer1.settings.volume = 100;
            } else {
                axWindowsMediaPlayer1.settings.volume = 0;
            }
        }public override void Play(MediaItem item, EventHandler playHandler) {
            if (Debug) {
                base.Play(item, playHandler);
                return;
            }try {
                this.item = item;
                handler = playHandler;
                if (item.Type == MediaItemType.Video) {
                    bool bExists = File.Exists(item.LocalPath);
                    if (bExists == false) {
                        base.Play(item, playHandler);
                        return;
                    }

videoTimer.Start();
}

else {
                    liveTimer.Start();
                }
            } catch (Exception ex) { logger.Warn(ex); }
        }public override void Stop() {
            if (Debug) { base.Stop(); return; }try { videoTimer.Close(); } catch { }
            try { liveTimer.Close(); } catch { }
            try { delay.Cancel(); } catch { }
            try { axWindowsMediaPlayer1.close(); } catch { }
        }private void axWindowsMediaPlayer1_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e) {
            if (axWindowsMediaPlayer1.playState == WMPPlayState.wmppsMediaEnded) {
                if (handler != null) { handler(this, EventArgs.Empty); }
            }
        }
    }
}

　　WMP最大的缺点是不稳定，有些功能不是很合理，而且对于重复播放的处理也比较扭曲；

　　基于Direct X开发的一个视频播放控件，控件代码如下：　　

ShgbitVideo

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.DirectX.AudioVideoPlayback;
using System.IO;
using System.Diagnostics;namespace ShgbitVideo {
    public partial class VideoBox : UserControl {
        public string FileName { get { return fileName; } }
        //public bool Loop { get { return loop; } set { loop = value; } }
        public int Volumn {
            get {
                int result = 0;
                if (IsVideo() && audio != null && !audio.Disposed) {
                    result = (audio.Volume + 10000) / 100;
                }
                return result;
            }
            set {
                if (IsVideo() && audio != null && !audio.Disposed) {
                    int arg = value;
                    if (arg > 100) {
                        arg = 100;
                    } else if (arg < 0) {
                        arg = 0;
                    }
                    audio.Volume = arg * 100 - 10000;
                }
            }
        }
        public double Duration {
            get {
                double result = 0.0f;
                if (IsVideo()) {
                    result = video.Duration;
                }
                return result;
            }
        }
        public double CurrentPosition {
            get {
                double result = 0.0f;
                if (IsVideo()) {
                    result = video.CurrentPosition;
                }
                return result;
            }
            set {
                if (IsVideo()) {
                    double arg = value;
                    if (arg < 0) {
                        arg = 0;
                    }
                    if (loop) {
                        try {
                            arg = arg % Duration;
                        } catch {
                            arg = 0;
                        }
                    } else {
                        if (arg > Duration) {
                            arg = Duration;
                        }
                    }
                    video.CurrentPosition = arg;
                }
            }
        }
        public Size DefaultSize {
            get {
                Size result = new Size(0, 0);
                if (IsVideo()) {
                    result = video.DefaultSize;
                }
                return result;
            }
        }
        public bool Playing {
            get {
                bool result = false;
                if (IsVideo()) {
                    result = video.Playing;
                }
                return result;
            }
        }
        public ShgbitPlayState PlayState {
            get {
                ShgbitPlayState result = ShgbitPlayState.Stopped;
                if (IsVideo()) {
                    result = (ShgbitPlayState)((int)video.State);
                }
                return result;
            }
        }
        public ShgbitMediaStyle MediaStyle {
            get {
                return GetMediaStyle(fileName);
            }
        }public VideoBox() {
            InitializeComponent();
        }private void VideoBox_Load(object sender, EventArgs e) {
            //
        }public void Open(string fileName) {
            Open(fileName, false);
        }public void Open(string fileName, bool autoRun) {
            Close();
            if (File.Exists(fileName)) {
                if (GetMediaStyle(fileName) == ShgbitMediaStyle.Video) {
                    this.fileName = fileName;
                    video = new Video(fileName, autoRun);
                    video.Owner = this;
                    video.Size = this.ClientSize;
                    try {
                        audio = video.Audio;
                    } catch (Exception ex) { }
                }
            } else {
                throw new FileNotFoundException(null, fileName);
            }
        }public void Play() {
            if (IsVideo() && PlayState != ShgbitPlayState.Running) {
                video.Play();
            }
        }public void Stop() {
            if (IsVideo() && PlayState != ShgbitPlayState.Stopped) {
                video.Stop();
            }
            fileName = string.Empty;
        }public void Close() {
            Stop();
            if (video != null && !video.Disposed) {
                if (audio != null && !audio.Disposed) {
                    audio.Dispose();
                    audio = null;
                }
                video.Dispose();
                video = null;
            }
        }private bool IsVideo() {
            bool result = false;if (video != null && !video.Disposed) {
                result = MediaStyle == ShgbitMediaStyle.Video;
            }return result;
        }public static ShgbitMediaStyle GetMediaStyle(string arg) {
            ShgbitMediaStyle result = ShgbitMediaStyle.Others;
            if (!string.IsNullOrEmpty(arg)) {
                switch (Path.GetExtension(arg).ToLower()) {
                    case ".wmv":
                    case ".avi":
                    case ".rm":
                    case ".rmvb":
                        result = ShgbitMediaStyle.Video;
                        break;
                    case ".jpg":
                    case ".jpeg":
                    case ".bmp":
                    case ".png":
                        result = ShgbitMediaStyle.Picture;
                        break;
                }
            } else {
                result = ShgbitMediaStyle.None;
            }
            return result;
        }private void VideoBox_Resize(object sender, EventArgs e) {
            if (video != null && !video.Disposed) {
                video.Size = this.ClientSize;
            }
        }private Video video;
        private Audio audio;
        private string fileName;
        private bool loop;
    }public enum ShgbitPlayState {
        Stopped = 0,
        Paused = 1,
        Running = 2,
    }public enum ShgbitMediaStyle {
        Others = 0,
        Video = 1,
        Picture = 2,
        None = 9
    }
}

　　基于此控件开发的视频播放窗口，应用在了NUOVA，Odin和Signage中：

VideoVS

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using OVNShare;
using System.IO;
using OVNShare.Helper;
using System.Threading;
using System.Diagnostics;
using log4net;
using WMPLib;namespace NuovaVSImpl {
    [VS(Name = "视频", Order = 2)]
    public partial class VideoVS : VisualSourceBase {
        static readonly ILog logger = LogManager.GetLogger(typeof(VideoVS));

[VSDescription(

"视频文件列表", "内容设置")]
public List<VideoFile> VideoFiles { get { return videoFiles; } set { videoFiles = value; } }

[VSDescription(

"基准时间", "内容设置")]
        public string StandardTime {
            get { return standardTime.ToString(); }
            set {
                try {
                    standardTime = Convert.ToDateTime(value);
                } catch {
                    standardTime = DateTime.Now;
                }
            }
        }private void VideoVS_Load(object sender, EventArgs e) {
            if (ScreenContext.ContainsKey("NeedLocate")) {
                try {
                    needLocate = Convert.ToBoolean(ScreenContext["NeedLocate"]);
                } catch { }
            }
            if (ScreenContext.ContainsKey("VideoVolumn")) {
                try {
                    videoVolumn = Convert.ToInt32(ScreenContext["VideoVolumn"]);
                } catch { }
            }
        }public VideoVS() {
            InitializeComponent();
        }public override void StartRender() {
            StopRender();
            base.StartRender();

roundtime

= videoFiles.Sum(p => p.Duration);
            double offset = 0;
            videoFiles.ForEach(p => {
                timeTable.Add(offset, p);
                p.Offset = offset;
                offset += p.Duration;
            });
            if (!VSDesignMode) {
                IDownloader.AddList(videoFiles.Where(p => !File.Exists(Path.Combine(MediaDir, p.FileName))).Select(p => Path.Combine(MediaDir, p.FileName)).ToList());
            }
            playThread = new Thread(new ThreadStart(Play));
            playThread.Start();
        }public override void StopRender() {
            base.StopRender();if (playThread != null && playThread.ThreadState == System.Threading.ThreadState.Running) {
                arEvent.Set();
                playThread.Join(2000);
            }
            timeTable.Clear();
            try {
                this.videoBox.Close();
            } catch (Exception ex) {
                logger.Warn(ex);
            }
            loadControl.Visible = false;
        }public override void Uninstall(Control parent) {
            if (videoBox != null) {
                videoBox.Dispose();
            }
            base.Uninstall(parent);
        }private void Play() {
            if (videoFiles.Count == 0) {
                this.UIInvoke(() => {
                    loadControl.Visible = false;
                });
                return;
            }while (Rendering && this.Created) {
                try {
                    double offset = (DateTime.Now - standardTime).TotalMilliseconds / 1000.0f % roundtime;
                    VideoFile vf = GetVideoFile(offset);
                    this.UIBeginInvoke(() => {
                        if (Rendering) {
                            try {
                                string filePath = Path.Combine(MediaDir, vf.FileName);
                                if (File.Exists(filePath)) {
                                    loadControl.Visible = false;
                                    bool isNew = false;
                                    if (filePath != videoBox.FileName) {
                                        videoBox.Open(filePath);
                                        videoBox.Volumn = videoVolumn;
                                        videoBox.Play();
                                        isNew = true;
                                    }double ruler = 0.2f;
                                    if (!needLocate && !isNew) {
                                        ruler = vf.Duration / 5;
                                    }
                                    if (ruler < 0.2f) {
                                        ruler = 0.2f;
                                    }
                                    if (Math.Abs(videoBox.CurrentPosition - (offset - vf.Offset)) > ruler) {
                                        Console.WriteLine("校正: {0}", videoBox.CurrentPosition - (offset - vf.Offset));
                                        videoBox.CurrentPosition = offset - vf.Offset;
                                    }
                                } else {
                                    if (!VSDesignMode) {
                                        IDownloader.AddList(new List<string> { filePath });
                                        loadControl.Visible = true;
                                        int percent = IDownloader.QueryProgress(vf.FileName);
                                        loadControl.UpdateProgress(percent);
                                    }
                                    videoBox.Close();
                                }
                            } catch (Exception ex) {
                                logger.Warn(ex.ToString());
                            }
                            arEvent.Set();
                        }
                    });
                    arEvent.WaitOne();
                    if (Rendering) {
                        Thread.Sleep(2000);
                    }
                } catch (Exception ex) {
                    logger.Warn(ex.ToString());
                }
            }
        }private VideoFile GetVideoFile(double offset) {
            VideoFile result = null;if (videoFiles.Count == 0) {
                result = null;
            } else if (videoFiles.Count == 1) {
                result = timeTable[0];
            } else {
                try {
                    List<double> seq = new List<double>(timeTable.Keys);
                    for (int i = 0; i < timeTable.Count; ++i) {
                        double x = seq[i];if (i + 1 < seq.Count) {
                            double y = seq[i + 1];
                            if (offset > x && offset < y) {
                                result = timeTable[seq[i]];
                                break;
                            }
                        } else {
                            result = timeTable[seq[seq.Count - 1]];
                        }
                    }
                } catch (Exception ex) {
                    logger.Warn(ex.ToString());
                }
            }return result;
        }public override void Update(VisualSourcePrototype arg) {
            StopRender();
            VideoFiles = arg.Data["VideoFiles"] as List<VideoFile>;
            StandardTime = (string)arg.Data["StandardTime"];
            StartRender();
        }private void VideoVS_Resize(object sender, EventArgs e) {
            loadControl.Location = new Point((this.ClientSize.Width - loadControl.Width) / 2, (this.ClientSize.Height - loadControl.Height) / 2);
        }private List<VideoFile> videoFiles = new List<VideoFile>();
        private Dictionary<double, VideoFile> timeTable = new Dictionary<double, VideoFile>();
        private double roundtime;
        private DateTime standardTime;
        private Thread playThread;
        private AutoResetEvent arEvent = new AutoResetEvent(false);
        private bool needLocate;
        private int videoVolumn;
    }
}

　　其优点在于稳定，并且在循环播放等的处理上要优于WMP控件，缺点在于因为是基于.NET3.5开发的WinForm控件，因此在显示特效的处理上平淡无奇，无法做出绚丽的效果，已经无法满足高要求用户的需求；

　　3、基于.NET4.0和WPF技术的视频播放：

　　基于WPF和MediaElement来实现视频播放，不但稳定，而且能够显示华丽的特效处理，这在WPF初体验里已经有所展示；但那只是一个特效的展示，而我下一步要做的，则是通过WPF来封装一个稳定并且绚丽的视频播放控件……

此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。原文来自 — 版权归原作者所有。

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