USER
--- 文件: PluginParameterViewModel.cs ---
using System.ComponentModel;
using SharedInterfaces;
namespace WpfMediaPlayer.ViewModels
{
public class PluginParameterViewModel : INotifyPropertyChanged
{
private double _value;
public string Name { get; set; }
public string DisplayName { get; set; }
public double Value
{
get => _value;
set
{
if (_value != value)
{
_value = value;
OnPropertyChanged(nameof(Value));
// 更新插件的参数
if (Plugin != null)
{
Plugin.Parameters[Name] = value;
}
}
}
}
public double Minimum { get; set; }
public double Maximum { get; set; }
public IPluginWithUI Plugin { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
--- 文件: PluginViewModel.cs ---
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using SharedInterfaces;
using System.Windows.Controls;
namespace WpfMediaPlayer.ViewModels
{
public class PluginViewModel : INotifyPropertyChanged
{
private bool _isEnabled;
public string PluginName => Plugin.PluginName;
public bool IsEnabled
{
get => _isEnabled;
set
{
if (_isEnabled != value)
{
_isEnabled = value;
Plugin.IsEnabled = value;
OnPropertyChanged(nameof(IsEnabled));
}
}
}
public ObservableCollection<PluginParameterViewModel> Parameters { get; set; } = new
ObservableCollection<PluginParameterViewModel>();
public IPluginBase Plugin { get; set; }
public UserControl Control
{
get
{
if (Plugin is IPluginWithUI pluginWithUI)
{
return pluginWithUI.GetControl();
}
return null;
}
}
public PluginViewModel(IPluginBase plugin)
{
Plugin = plugin;
IsEnabled = plugin.IsEnabled;
if (plugin is IPluginWithUI pluginWithUI)
{
foreach (var param in pluginWithUI.Parameters)
{
Parameters.Add(new PluginParameterViewModel
{
Name = param.Key,
DisplayName = param.Key, // 可以根据需要更改显示名称
Value = Convert.ToDouble(param.Value),
Minimum = 0, // 根据插件定义设置
Maximum = 2, // 根据插件定义设置
Plugin = pluginWithUI
});
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
--- 文件: MainWindow.xaml ---
<Window x:Class="WpfMediaPlayer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfMediaPlayer"
Title="WPF媒体播放器" Height="600" Width="800"
AllowDrop="True"
Drop="Window_Drop"
DragOver="Window_DragOver">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<!-- 主内容区，包含视频和处理后的视频 -->
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!-- 左侧视频显示区域 -->
<MediaElement Grid.Column="0" x:Name="mediaElement"
LoadedBehavior="Manual"
UnloadedBehavior="Stop"
Stretch="Uniform"
MediaOpened="MediaElement_MediaOpened"
MediaEnded="MediaElement_MediaEnded" />
<!-- 右侧处理后的视频显示区域，使用 Border 设置背景 -->
<Border Grid.Column="1" Background="LightGray">
<Image x:Name="imageDisplay" Stretch="Uniform" />
</Border>
</Grid>
<!-- 控制面板 -->
<Border Grid.Row="1" Background="Black" Padding="10">
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
<!-- 播放控制按钮 -->
<Button x:Name="playButton" Content="播放" Width="60" Click="PlayButton_Click"/>
<Button x:Name="pauseButton" Content="暂停" Width="60" Margin="5,0" Click="PauseButton_Click"/>
<Button x:Name="stopButton" Content="停止" Width="60" Margin="5,0" Click="StopButton_Click"/>
<Button x:Name="rewindButton" Content="<< 10秒" Width="90" Margin="5,0"
Click="RewindButton_Click"/>
<Button x:Name="forwardButton" Content="10秒 >>" Width="90" Margin="5,0"
Click="ForwardButton_Click"/>
<!-- 使用 ToggleButton 作为插件列表按钮 -->
<ToggleButton x:Name="pluginListButton" Content="插件列表" Width="80" Margin="5,0"/>
<!-- 视频进度条 -->
<Slider x:Name="progressSlider"
Minimum="0"
Value="0"
IsEnabled="False"
ValueChanged="ProgressSlider_ValueChanged"
PreviewMouseLeftButtonDown="ProgressSlider_PreviewMouseLeftButtonDown"
PreviewMouseLeftButtonUp="ProgressSlider_PreviewMouseLeftButtonUp"
Width="300"
Margin="10,0"/>
<!-- 音量控制 -->
<TextBlock Text="音量" Foreground="White" VerticalAlignment="Center" Margin="10,0,5,0"/>
<Slider x:Name="volumeSlider" Minimum="0" Maximum="1" Value="0.5" Width="100"
ValueChanged="VolumeSlider_ValueChanged"/>
<!-- 时间显示 -->
<TextBlock x:Name="timeDisplay" Foreground="White" Margin="10,0" VerticalAlignment="Center"/>
<!-- 插件加载按钮 -->
<Button x:Name="plugButton" Content="加载插件" Width="80" Margin="5,0" Click="PlugButton_Click"/>
</StackPanel>
</StackPanel>
</Border>
<!-- 插件列表弹出框 -->
<Popup x:Name="pluginListPopup"
Placement="Bottom"
PlacementTarget="{Binding ElementName=pluginListButton}"
StaysOpen="False"
AllowsTransparency="True"
PopupAnimation="Slide"
Width="300"
IsOpen="{Binding IsChecked, ElementName=pluginListButton, Mode=TwoWay}"
Focusable="False">
<Border Background="White" BorderBrush="Gray" BorderThickness="1" CornerRadius="5" Padding="10">
<StackPanel Width="280" Margin="0">
<TextBlock Text="已加载插件：" FontWeight="Bold" Margin="5"/>
<!-- 修改 ItemsSource 绑定到 PluginViewModels -->
<ItemsControl ItemsSource="{Binding PluginViewModels}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding PluginName}" IsExpanded="False" Margin="5">
<StackPanel>
<CheckBox Content="启用" IsChecked="{Binding IsEnabled, Mode=TwoWay}"
Margin="0,0,0,5"/>
<!-- 插件参数 UserControl -->
<ContentPresenter Content="{Binding Control}" />
</StackPanel>
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<!-- 插件加载提示 -->
<TextBlock Text="拖入 DLL 文件以加载插件"
Foreground="Gray"
FontStyle="Italic"
HorizontalAlignment="Center"
Margin="5,10,5,0"/>
</StackPanel>
</Border>
</Popup>
</Grid>
</Window>
--- 文件: MainWindow.xaml.cs ---
// WpfMediaPlayer/MainWindow.xaml.cs
using Microsoft.Win32;
using SharedInterfaces;
using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using WpfMediaPlayer.ViewModels;
namespace WpfMediaPlayer
{
public partial class MainWindow : Window
{
private readonly DispatcherTimer timer; // 用于更新进度条和时间显示
private bool isDraggingSlider = false; // 判断用户是否正在拖动进度条
private readonly PluginManager pluginManager; // 插件管理器
public MainWindow()
{
InitializeComponent();
// 初始化插件管理器
pluginManager = new PluginManager();
// 设置 Popup 的 DataContext 为插件管理器
pluginListPopup.DataContext = pluginManager;
// 初始化计时器
timer = new DispatcherTimer
{
Interval = TimeSpan.FromMilliseconds(33) // 大约每秒30帧
};
timer.Tick += Timer_Tick;
// 初始化音量
volumeSlider.Value = 0.5;
mediaElement.Volume = volumeSlider.Value;
// 自动加载 Plugins 文件夹中的所有插件
LoadAllPlugins();
// 添加全局点击事件
this.PreviewMouseDown += MainWindow_PreviewMouseDown;
}
#region 控件事件处理
// 播放按钮事件
private void PlayButton_Click(object sender, RoutedEventArgs e)
{
if (mediaElement.Source != null)
{
mediaElement.Play();
timer.Start();
}
else
{
OpenFileDialog openFileDialog = new OpenFileDialog
{
Filter = "媒体文件 (*.mpg;*.mp4;*.mp3;*.avi;*.mkv;*.flv)|*.mp4;*.mp3;*.avi;*.mkv;*.flv|所有文件
(*.*)|*.*"
};
if (openFileDialog.ShowDialog() == true)
{
LoadAndPlayMedia(openFileDialog.FileName);
}
}
}
// 暂停按钮事件
private void PauseButton_Click(object sender, RoutedEventArgs e)
{
mediaElement.Pause();
timer.Stop(); // 暂停计时器
}
// 停止按钮事件
private void StopButton_Click(object sender, RoutedEventArgs e)
{
mediaElement.Stop();
timer.Stop(); // 停止计时器
progressSlider.Value = 0;
if (mediaElement.NaturalDuration.HasTimeSpan)
{
timeDisplay.Text = $"00:00:00 / {mediaElement.NaturalDuration.TimeSpan:hh\\:mm\\:ss}";
}
else
{
timeDisplay.Text = "00:00:00 / 00:00:00";
}
// 清空插件显示内容
foreach (var plugin in pluginManager.IPlugins)
{
try
{
// 如果插件需要处理null帧（如重置状态），调用其ProcessFrame
plugin.ProcessFrame(null);
}
catch (Exception ex)
{
Console.WriteLine($"插件 {plugin.PluginName} 处理异常：{ex.Message}");
}
}
}
// 快退10秒按钮事件
private void RewindButton_Click(object sender, RoutedEventArgs e)
{
if (mediaElement.Position.TotalSeconds > 10)
{
mediaElement.Position -= TimeSpan.FromSeconds(10);
}
else
{
mediaElement.Position = TimeSpan.Zero;
}
}
// 快进10秒按钮事件
private void ForwardButton_Click(object sender, RoutedEventArgs e)
{
if (mediaElement.NaturalDuration.HasTimeSpan)
{
if (mediaElement.Position.TotalSeconds + 10 < mediaElement.NaturalDuration.TimeSpan.TotalSeconds)
{
mediaElement.Position += TimeSpan.FromSeconds(10);
}
else
{
mediaElement.Position = mediaElement.NaturalDuration.TimeSpan;
}
}
}
// 音量滑块事件
private void VolumeSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (mediaElement != null)
{
mediaElement.Volume = volumeSlider.Value;
}
}
// 进度条滑块开始拖动事件
private void ProgressSlider_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
isDraggingSlider = true;
timer.Stop();
}
// 进度条滑块拖动结束事件
private void ProgressSlider_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
isDraggingSlider = false;
UpdateMediaPosition();
timer.Start();
}
// 插件加载按钮点击事件，加载 IPluginBase 或 IPluginWithUI 类型的 DLL 并设置其处理逻辑
private void PlugButton_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog
{
Filter = "DLL文件 (*.dll)|*.dll"
};
if (openFileDialog.ShowDialog() == true)
{
try
{
// 加载插件
Assembly assembly = Assembly.LoadFile(openFileDialog.FileName);
// 获取实现了IPluginWithUI接口的类型
foreach (Type type in assembly.GetTypes())
{
if (typeof(IPluginWithUI).IsAssignableFrom(type) && !type.IsInterface && !type.IsAbstract)
{
IPluginWithUI pluginWithUI = (IPluginWithUI)Activator.CreateInstance(type);
pluginWithUI.Initialize();
pluginManager.AddIPluginWithUI(pluginWithUI);
MessageBox.Show($"插件 {pluginWithUI.PluginName} 加载成功，并设置为处理帧。");
}
else if (typeof(IPluginBase).IsAssignableFrom(type) && !type.IsInterface && !type.IsAbstract)
{
// 获取仅实现了IPluginBase接口的插件
IPluginBase pluginBase = (IPluginBase)Activator.CreateInstance(type);
pluginBase.Initialize();
pluginManager.AddIPlugin(pluginBase);
MessageBox.Show($"插件 {pluginBase.PluginName} 加载成功，并设置为处理帧。");
}
}
}
catch (Exception ex)
{
MessageBox.Show($"加载插件失败: {ex.Message}");
}
}
}
// 进度条滑块值变化事件
private void ProgressSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (mediaElement != null && mediaElement.NaturalDuration.HasTimeSpan && !isDraggingSlider)
{
mediaElement.Position = TimeSpan.FromSeconds(progressSlider.Value);
UpdateTimeDisplay();
}
}
#endregion
#region 媒体事件处理
// 当媒体文件加载完成后
private void MediaElement_MediaOpened(object sender, RoutedEventArgs e)
{
if (mediaElement.NaturalDuration.HasTimeSpan)
{
progressSlider.IsEnabled = true;
progressSlider.Minimum = 0;
progressSlider.Maximum = mediaElement.NaturalDuration.TimeSpan.TotalSeconds;
progressSlider.Value = mediaElement.Position.TotalSeconds;
// 设置时间显示
timeDisplay.Text = $"{mediaElement.Position:hh\\:mm\\:ss} / {mediaElement.NaturalDuration.TimeSpan:hh\
\:mm\\:ss}";
Console.WriteLine("媒体文件已打开。");
}
}
// 当媒体播放结束
private void MediaElement_MediaEnded(object sender, RoutedEventArgs e)
{
mediaElement.Stop();
timer.Stop();
progressSlider.Value = 0;
if (mediaElement.NaturalDuration.HasTimeSpan)
{
timeDisplay.Text = "00:00:00 / " + mediaElement.NaturalDuration.TimeSpan.ToString(@"hh\:mm\:ss");
}
else
{
timeDisplay.Text = "00:00:00 / 00:00:00";
}
// 清空插件显示内容
foreach (var plugin in pluginManager.IPlugins)
{
try
{
// 如果插件需要处理null帧（如重置状态），调用其ProcessFrame
plugin.ProcessFrame(null);
}
catch (Exception ex)
{
Console.WriteLine($"插件 {plugin.PluginName} 处理异常：{ex.Message}");
}
}
}
#endregion
#region 计时器和进度更新
// 计时器更新视频帧及进度条
private void Timer_Tick(object sender, EventArgs e)
{
if (mediaElement.NaturalDuration.HasTimeSpan && !isDraggingSlider)
{
progressSlider.Maximum = mediaElement.NaturalDuration.TimeSpan.TotalSeconds;
progressSlider.Value = mediaElement.Position.TotalSeconds;
// 更新时间显示
UpdateTimeDisplay();
// 捕获并处理当前帧
CaptureAndProcessFrame();
}
}
// 更新时间显示
private void UpdateTimeDisplay()
{
if (mediaElement.NaturalDuration.HasTimeSpan)
{
timeDisplay.Text = $"{mediaElement.Position:hh\\:mm\\:ss} / {mediaElement.NaturalDuration.TimeSpan:hh\
\:mm\\:ss}";
}
else
{
timeDisplay.Text = $"{mediaElement.Position:hh\\:mm\\:ss} / 00:00:00";
}
}
// 捕获当前视频帧并处理
private void CaptureAndProcessFrame()
{
BitmapSource frame = CaptureCurrentFrame();
if (frame != null)
{
Console.WriteLine("捕获到一帧视频。");
// 在 UI 线程上处理帧
Dispatcher.BeginInvoke(new Action(() =>
{
BitmapSource processedFrame = frame;
// 依次应用所有启用的 IPluginBase 插件
foreach (var plugin in pluginManager.IPlugins.Where(p => p.IsEnabled))
{
try
{
processedFrame = plugin.ProcessFrame(processedFrame);
Console.WriteLine($"插件 {plugin.PluginName} 处理完成。");
}
catch (Exception ex)
{
Console.WriteLine($"插件 {plugin.PluginName} 处理异常：{ex.Message}");
}
}
// 更新图像显示
imageDisplay.Source = processedFrame;
Console.WriteLine("更新 imageDisplay.Source 成功。");
}), DispatcherPriority.Background);
}
else
{
Console.WriteLine("帧捕获返回null。");
}
}
// 捕获当前视频帧的方法
private BitmapSource CaptureCurrentFrame()
{
double width = mediaElement.ActualWidth;
double height = mediaElement.ActualHeight;
if (width == 0 || height == 0)
return null;
try
{
RenderTargetBitmap rtb = new RenderTargetBitmap(
(int)width, (int)height,
96, 96,
PixelFormats.Pbgra32); // 确保正确的像素格式
DrawingVisual dv = new DrawingVisual();
using (DrawingContext dc = dv.RenderOpen())
{
dc.DrawRectangle(new VisualBrush(mediaElement), null, new Rect(new Point(), new Size(width,
height)));
}
rtb.Render(dv);
return rtb;
}
catch
{
return null;
}
}
#endregion
#region 插件管理
// 自动加载 Plugins 文件夹中的所有插件
private void LoadAllPlugins()
{
string pluginsPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Plugins");
if (Directory.Exists(pluginsPath))
{
pluginManager.LoadPlugins(pluginsPath);
}
else
{
// 如果 Plugins 文件夹不存在，创建一个
Directory.CreateDirectory(pluginsPath);
Console.WriteLine("Plugins 文件夹已创建。");
}
}
#endregion
#region 拖放处理
// 统一处理拖放事件
private void Window_DragOver(object sender, DragEventArgs e)
{
HandleDragOver(e, allowDll: false);
}
private void Window_Drop(object sender, DragEventArgs e)
{
HandleDrop(e, allowDll: false);
}
private void PluginListPopup_DragOver(object sender, DragEventArgs e)
{
HandleDragOver(e, allowDll: true);
}
private void PluginListPopup_Drop(object sender, DragEventArgs e)
{
HandleDrop(e, allowDll: true);
}
// 统一处理拖放事件的逻辑
private void HandleDragOver(DragEventArgs e, bool allowDll = false)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
bool hasValidFile = false;
foreach (var file in files)
{
string extension = Path.GetExtension(file).ToLower();
if (allowDll && extension == ".dll")
{
hasValidFile = true;
break;
}
else if (!allowDll && IsMediaFile(extension))
{
hasValidFile = true;
break;
}
}
e.Effects = hasValidFile ? DragDropEffects.Copy : DragDropEffects.None;
}
else
{
e.Effects = DragDropEffects.None;
}
e.Handled = true;
}
private void HandleDrop(DragEventArgs e, bool allowDll = false)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
foreach (string filePath in files)
{
string extension = Path.GetExtension(filePath).ToLower();
if (allowDll && extension == ".dll")
{
// 加载插件 DLL
try
{
Assembly assembly = Assembly.LoadFile(filePath);
foreach (Type type in assembly.GetTypes())
{
if (typeof(IPluginWithUI).IsAssignableFrom(type) && !type.IsInterface && !
type.IsAbstract)
{
IPluginWithUI pluginWithUI = (IPluginWithUI)Activator.CreateInstance(type);
pluginWithUI.Initialize();
pluginManager.AddIPluginWithUI(pluginWithUI);
Console.WriteLine($"插件 {pluginWithUI.PluginName} 加载成功。");
}
else if (typeof(IPluginBase).IsAssignableFrom(type) && !type.IsInterface && !
type.IsAbstract)
{
// 获取仅实现了IPluginBase接口的插件
IPluginBase pluginBase = (IPluginBase)Activator.CreateInstance(type);
pluginBase.Initialize();
pluginManager.AddIPlugin(pluginBase);
Console.WriteLine($"插件 {pluginBase.PluginName} 加载成功，无UI控件。");
}
}
MessageBox.Show($"插件加载成功: {filePath}");
}
catch (Exception ex)
{
MessageBox.Show($"加载插件失败: {ex.Message}");
Console.WriteLine($"加载插件失败: {ex.Message}");
}
}
else if (!allowDll && IsMediaFile(extension))
{
// 加载并播放媒体文件
LoadAndPlayMedia(filePath);
}
}
}
}
// 判断是否为支持的媒体文件
private bool IsMediaFile(string extension)
{
string[] supportedExtensions = { ".mp4", ".mp3", ".avi", ".mkv", ".flv" };
return supportedExtensions.Contains(extension);
}
#endregion
#region 外部点击关闭 Popup
private void MainWindow_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (pluginListPopup.IsOpen)
{
// 获取点击的元素
DependencyObject clickedElement = e.OriginalSource as DependencyObject;
// 检查点击是否在 Popup 内部
if (!IsDescendant(pluginListPopup.Child, clickedElement))
{
pluginListPopup.IsOpen = false;
// 如果使用 ToggleButton，取消选中状态
pluginListButton.IsChecked = false;
}
}
}
// 递归检查是否为子孙元素
private bool IsDescendant(DependencyObject parent, DependencyObject child)
{
if (child == null) return false;
if (parent == child) return true;
DependencyObject current = child;
while (current != null)
{
if (current == parent)
return true;
current = VisualTreeHelper.GetParent(current);
}
return false;
}
#endregion
#region 媒体播放
// 加载并播放媒体文件
private void LoadAndPlayMedia(string filePath)
{
try
{
mediaElement.Source = new Uri(filePath);
mediaElement.Play();
timer.Start(); // 启动计时器以更新进度条
Console.WriteLine($"播放媒体文件: {filePath}");
}
catch (Exception ex)
{
MessageBox.Show($"无法播放文件: {ex.Message}", "播放错误", MessageBoxButton.OK, MessageBoxImage.Error);
Console.WriteLine($"无法播放文件: {ex.Message}");
}
}
// 更新视频播放位置
private void UpdateMediaPosition()
{
if (mediaElement != null && mediaElement.NaturalDuration.HasTimeSpan)
{
mediaElement.Position = TimeSpan.FromSeconds(progressSlider.Value);
}
}
#endregion
#region Expander Toggle
private void ExpanderToggle_Click(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
if (button != null)
{
Expander expander = button.Parent as Expander;
if (expander != null)
{
expander.IsExpanded = !expander.IsExpanded;
}
}
}
#endregion
}
}
--- 文件: PluginManager.cs ---
using SharedInterfaces;
using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows.Controls;
using WpfMediaPlayer.ViewModels;
namespace WpfMediaPlayer
{
public class PluginManager
{
public ObservableCollection<IPluginBase> IPlugins { get; private set; } = new ObservableCollection<IPluginBase>
();
public ObservableCollection<IPluginWithUI> IPluginsWithUI { get; private set; } = new
ObservableCollection<IPluginWithUI>();
public ObservableCollection<PluginViewModel> PluginViewModels { get; private set; } = new
ObservableCollection<PluginViewModel>();
/// <summary>
/// 加载指定路径中的所有插件DLL
/// </summary>
/// <param name="pluginsPath">插件文件夹路径</param>
public void LoadPlugins(string pluginsPath)
{
if (!Directory.Exists(pluginsPath))
return;
var dllFiles = Directory.GetFiles(pluginsPath, "*.dll");
foreach (var dll in dllFiles)
{
try
{
Assembly assembly = Assembly.LoadFrom(dll);
var types = assembly.GetTypes();
foreach (var type in types)
{
if (typeof(IPluginWithUI).IsAssignableFrom(type) && !type.IsInterface && !type.IsAbstract)
{
// 插件实现了IPluginWithUI
IPluginWithUI pluginWithUI = (IPluginWithUI)Activator.CreateInstance(type);
pluginWithUI.Initialize();
IPlugins.Add(pluginWithUI);
IPluginsWithUI.Add(pluginWithUI);
PluginViewModels.Add(new PluginViewModel(pluginWithUI));
Console.WriteLine($"Loaded IPluginWithUI: {pluginWithUI.PluginName}");
}
else if (typeof(IPluginBase).IsAssignableFrom(type) && !type.IsInterface && !type.IsAbstract)
{
// 插件仅实现了IPluginBase
IPluginBase pluginBase = (IPluginBase)Activator.CreateInstance(type);
pluginBase.Initialize();
IPlugins.Add(pluginBase);
PluginViewModels.Add(new PluginViewModel(pluginBase));
Console.WriteLine($"Loaded IPluginBase: {pluginBase.PluginName}");
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Failed to load plugin from {dll}: {ex.Message}");
}
}
}
/// <summary>
/// 卸载所有插件
/// </summary>
public void UnloadPlugins()
{
// 卸载IPluginWithUI插件
foreach (var pluginWithUI in IPluginsWithUI)
{
pluginWithUI.GetControl()?.Dispatcher.Invoke(() => pluginWithUI.GetControl().ClearValue
(UserControl.ContentProperty));
}
IPluginsWithUI.Clear();
// 卸载IPluginBase插件
IPlugins.Clear();
PluginViewModels.Clear();
}
/// <summary>
/// 添加一个IPluginBase插件
/// </summary>
/// <param name="plugin">插件实例</param>
public void AddIPlugin(IPluginBase plugin)
{
if (plugin != null)
{
plugin.Initialize();
IPlugins.Add(plugin);
PluginViewModels.Add(new PluginViewModel(plugin));
Console.WriteLine($"Loaded IPluginBase: {plugin.PluginName}");
}
}
/// <summary>
/// 添加一个IPluginWithUI插件
/// </summary>
/// <param name="plugin">插件实例</param>
public void AddIPluginWithUI(IPluginWithUI plugin)
{
if (plugin != null)
{
plugin.Initialize();
IPlugins.Add(plugin);
IPluginsWithUI.Add(plugin);
PluginViewModels.Add(new PluginViewModel(plugin));
Console.WriteLine($"Loaded IPluginWithUI: {plugin.PluginName}");
}
}
}
}
--- 文件: IPluginbase.cs ---
// SharedInterfaces/IPluginBase.cs
using System.Windows.Media.Imaging;
namespace SharedInterfaces
{
public interface IPluginBase
{
/// <summary>
/// 插件名称
/// </summary>
string PluginName { get; }
/// <summary>
/// 插件是否启用
/// </summary>
bool IsEnabled { get; set; }
/// <summary>
/// 初始化插件
/// </summary>
void Initialize();
/// <summary>
/// 处理视频帧数据，并返回处理后的帧
/// </summary>
/// <param name="frame">当前视频帧</param>
/// <returns>处理后的 BitmapSource 视频帧</returns>
BitmapSource ProcessFrame(BitmapSource frame);
}
}
--- 文件: IPluginWithUI.cs ---
// SharedInterfaces/IPluginWithUI.cs
using System.Collections.Generic;
using System.Windows.Controls;
namespace SharedInterfaces
{
public interface IPluginWithUI : IPluginBase
{
/// <summary>
/// 获取插件的 UserControl 界面
/// </summary>
/// <returns>UserControl 用于显示</returns>
UserControl GetControl();
/// <summary>
/// 获取插件的参数字典
/// </summary>
IDictionary<string, object> Parameters { get; }
}
}
--- 文件: PluginParameter.cs ---
// SharedInterfaces/PluginParameter.cs
using System.ComponentModel;
namespace SharedInterfaces
{
public class PluginParameter : INotifyPropertyChanged
{
private string name;
private double value;
private double min;
private double max;
public string Name
{
get => name;
set { name = value; OnPropertyChanged(nameof(Name)); }
}
public double Value
{
get => value;
set { this.value = value; OnPropertyChanged(nameof(Value)); }
}
public double Min
{
get => min;
set { min = value; OnPropertyChanged(nameof(Min)); }
}
public double Max
{
get => max;
set { max = value; OnPropertyChanged(nameof(Max)); }
}
public PluginParameter(string name, double value, double min, double max)
{
Name = name;
Value = value;
Min = min;
Max = max;
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
--- 文件: IComponent.cs ---
// SharedInterfaces/IComponent.cs
using System.Windows.Controls;
namespace SharedInterfaces
{
public interface IComponent
{
/// <summary>
/// 组件的名称
/// </summary>
string ComponentName { get; }
/// <summary>
/// 初始化组件
/// </summary>
void Initialize();
/// <summary>
/// 获取组件的 UserControl 界面
/// </summary>
/// <returns>UserControl用于显示</returns>
UserControl GetControl();
/// <summary>
/// 释放组件资源
/// </summary>
void Unload();
}
}<Window x:Class="WpfMediaPlayer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfMediaPlayer"
Title="WPF媒体播放器" Height="600" Width="800"
AllowDrop="True"
Drop="Window_Drop"
DragOver="Window_DragOver">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<!-- 主内容区，包含原始视频和处理后的视频 -->
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!-- 左侧视频显示区域 -->
<MediaElement Grid.Column="0" x:Name="mediaElement"
LoadedBehavior="Manual"
UnloadedBehavior="Stop"
Stretch="Uniform"
MediaOpened="MediaElement_MediaOpened"
MediaEnded="MediaElement_MediaEnded" />
<!-- 右侧处理后的视频显示区域，使用 Border 设置背景 -->
<Border Grid.Column="1" Background="LightGray">
<Image x:Name="imageDisplay" Stretch="Uniform" />
</Border>
</Grid>
<!-- 控制面板 -->
<Border Grid.Row="1" Background="Black" Padding="10">
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
<!-- 播放控制按钮 -->
<Button x:Name="playButton" Content="播放" Width="60" Click="PlayButton_Click"/>
<Button x:Name="pauseButton" Content="暂停" Width="60" Margin="5,0" Click="PauseButton_Click"/>
<Button x:Name="stopButton" Content="停止" Width="60" Margin="5,0" Click="StopButton_Click"/>
<Button x:Name="rewindButton" Content="<< 10秒" Width="90" Margin="5,0" Click="RewindButton_Click"/>
<Button x:Name="forwardButton" Content="10秒 >>" Width="90" Margin="5,0" Click="ForwardButton_Click"/>
<!-- 使用 ToggleButton 作为插件列表按钮 -->
<ToggleButton x:Name="pluginListButton" Content="插件列表" Width="80" Margin="5,0"/>
<!-- 视频进度条 -->
<Slider x:Name="progressSlider"
Minimum="0"
Value="0"
IsEnabled="False"
ValueChanged="ProgressSlider_ValueChanged"
PreviewMouseLeftButtonDown="ProgressSlider_PreviewMouseLeftButtonDown"
PreviewMouseLeftButtonUp="ProgressSlider_PreviewMouseLeftButtonUp"
Width="300"
Margin="10,0"/>
<!-- 音量控制 -->
<TextBlock Text="音量" Foreground="White" VerticalAlignment="Center" Margin="10,0,5,0"/>
<Slider x:Name="volumeSlider" Minimum="0" Maximum="1" Value="0.5" Width="100" ValueChanged="VolumeSlider_ValueChanged"/>
<!-- 时间显示 -->
<TextBlock x:Name="timeDisplay" Foreground="White" Margin="10,0" VerticalAlignment="Center"/>
<!-- 插件加载按钮 -->
<Button x:Name="plugButton" Content="加载插件" Width="80" Margin="5,0" Click="PlugButton_Click"/>
</StackPanel>
</StackPanel>
</Border>
<!-- 插件列表弹出框 -->
<Popup x:Name="pluginListPopup"
Placement="Bottom"
PlacementTarget="{Binding ElementName=pluginListButton}"
StaysOpen="False"
AllowsTransparency="True"
PopupAnimation="Slide"
Width="300"
IsOpen="{Binding IsChecked, ElementName=pluginListButton, Mode=TwoWay}"
Focusable="False">
<Border Background="White" BorderBrush="Gray" BorderThickness="1" CornerRadius="5" Padding="10">
<StackPanel Width="280" Margin="0">
<TextBlock Text="已加载插件：" FontWeight="Bold" Margin="5"/>
<!-- 修改 ItemsSource 绑定到 PluginViewModels -->
<ItemsControl ItemsSource="{Binding PluginViewModels}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding PluginName}" IsExpanded="False" Margin="5">
<StackPanel>
<CheckBox Content="启用" IsChecked="{Binding IsEnabled, Mode=TwoWay}" Margin="0,0,0,5"/>
<!-- 插件参数 UserControl -->
<ContentPresenter Content="{Binding Control}" />
</StackPanel>
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<!-- 插件加载提示 -->
<TextBlock Text="拖入 DLL 文件以加载插件"
Foreground="Gray"
FontStyle="Italic"
HorizontalAlignment="Center"
Margin="5,10,5,0"/>
</StackPanel>
</Border>
</Popup>
</Grid>
</Window> 根据这个代码 写一个 DLL CS WPF的插件 并且启动Capture 与播放器的视频帧尺寸一样，然后通过RENDER 实现对视频 中间1/4部分行像素 往左边移动40像素位置 全部数据绑定 用来测试ASSISTANT
To create a DLL plugin for your WPF Media Player that shifts the central 1/4 of each video frame's pixels 40 pixels to the left, follow the steps below. This plugin will implement the `IPluginWithUI` interface, allowing it to integrate seamlessly with your existing application and provide a user interface for adjusting parameters if needed.
## Overview
1. **Plugin Functionality:**
- **Shift Area:** Central 1/4 of each video frame.
- **Shift Amount:** 40 pixels to the left.
- **Parameters:** Allows customization of the shift amount and the fraction of the frame to shift.
2. **Components:**
- **Plugin Class (`PixelShiftPlugin`):** Implements the `IPluginWithUI` interface.
- **User Control (`PixelShiftPluginControl`):** Provides a UI for adjusting plugin parameters.
- **Shared Interfaces:** Ensure the plugin adheres to the required interfaces (`IPluginBase` and `IPluginWithUI`).
3. **Data Binding:**
- Parameters are bound to UI controls, allowing real-time adjustments.
- Changes to parameters automatically update the plugin's behavior.
## Step-by-Step Implementation
### 1. Create a Class Library Project
1. **Open Visual Studio:**
- Create a new **Class Library (.NET Framework)** project. Name it `PixelShiftPlugin`.
2. **Add References:**
- Add references to `PresentationCore`, `PresentationFramework`, `WindowsBase`, and any other necessary assemblies.
- **Important:** Reference the `SharedInterfaces` project or assembly to access `IPluginBase` and `IPluginWithUI`.
### 2. Implement the Plugin Class
Create a class named `PixelShiftPlugin` that implements the `IPluginWithUI` interface and `INotifyPropertyChanged` for data binding.
**PixelShiftPlugin.cs**
```csharp
using SharedInterfaces;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace PixelShiftPluginNamespace
{
public class PixelShiftPlugin : IPluginWithUI, INotifyPropertyChanged
{
// Plugin Name
public string PluginName => "Pixel Shift Plugin";
private bool _isEnabled;
public bool IsEnabled
{
get => _isEnabled;
set
{
if(_isEnabled != value)
{
_isEnabled = value;
OnPropertyChanged(nameof(IsEnabled));
}
}
}
// Parameters Dictionary
public IDictionary<string, object> Parameters { get; private set; }
// User Control for UI
private UserControl control;
// Constructor
public PixelShiftPlugin()
{
Parameters = new Dictionary<string, object>
{
{ "ShiftAmount", 40 }, // Default shift amount in pixels
{ "ShiftRegionFraction", 0.25 } // Default central 1/4 region
};
}
// Initialize Plugin
public void Initialize()
{
// Initialization logic if needed
}
// Property for Shift Amount (pixels)
public int ShiftAmount
{
get => Parameters.ContainsKey("ShiftAmount") ? Convert.ToInt32(Parameters["ShiftAmount"]) : 40;
set
{
if (Parameters.ContainsKey("ShiftAmount"))
{
if ((int)Parameters["ShiftAmount"] != value)
{
Parameters["ShiftAmount"] = value;
OnPropertyChanged(nameof(ShiftAmount));
}
}
else
{
Parameters["ShiftAmount"] = value;
OnPropertyChanged(nameof(ShiftAmount));
}
}
}
// Property for Shift Region Fraction
public double ShiftRegionFraction
{
get => Parameters.ContainsKey("ShiftRegionFraction") ? Convert.ToDouble(Parameters["ShiftRegionFraction"]) : 0.25;
set
{
if (Parameters.ContainsKey("ShiftRegionFraction"))
{
if ((double)Parameters["ShiftRegionFraction"] != value)
{
Parameters["ShiftRegionFraction"] = value;
OnPropertyChanged(nameof(ShiftRegionFraction));
}
}
else
{
Parameters["ShiftRegionFraction"] = value;
OnPropertyChanged(nameof(ShiftRegionFraction));
}
}
}
// Process Video Frame
public BitmapSource ProcessFrame(BitmapSource frame)
{
if (!IsEnabled) // Check if plugin is enabled
return frame;
if (frame == null)
return null;
// Ensure the frame is in Bgra32 format
if (frame.Format != PixelFormats.Bgra32)
{
frame = new FormatConvertedBitmap(frame, PixelFormats.Bgra32, null, 0);
}
int width = frame.PixelWidth;
int height = frame.PixelHeight;
int bytesPerPixel = (frame.Format.BitsPerPixel + 7) / 8;
int stride = width * bytesPerPixel;
byte[] pixelData = new byte[height * stride];
frame.CopyPixels(pixelData, stride, 0);
// Retrieve parameters
int shiftAmount = ShiftAmount;
double shiftRegionFraction = ShiftRegionFraction;
// Calculate central region
int regionWidth = (int)(width * shiftRegionFraction);
int regionStartX = (width - regionWidth) / 2;
int regionEndX = regionStartX + regionWidth;
// Shift pixels in the central region
for (int y = 0; y < height; y++)
{
for (int x = regionStartX; x < regionEndX; x++)
{
int sourceIndex = y * stride + x * bytesPerPixel;
int targetX = x - shiftAmount;
if (targetX < regionStartX)
continue; // Skip if target position is out of bounds
int targetIndex = y * stride + targetX * bytesPerPixel;
// Shift pixel data to the left
pixelData[targetIndex] = pixelData[sourceIndex]; // B
pixelData[targetIndex + 1] = pixelData[sourceIndex + 1]; // G
pixelData[targetIndex + 2] = pixelData[sourceIndex + 2]; // R
pixelData[targetIndex + 3] = pixelData[sourceIndex + 3]; // A
// Optionally, clear the original pixel to visualize the shift
pixelData[sourceIndex] = 0;
pixelData[sourceIndex + 1] = 0;
pixelData[sourceIndex + 2] = 0;
pixelData[sourceIndex + 3] = 255; // Fully opaque
}
}
// Create a new BitmapSource from the modified pixel data
var modifiedFrame = BitmapSource.Create(width, height, frame.DpiX, frame.DpiY,
PixelFormats.Bgra32, null, pixelData, stride);
return modifiedFrame;
}
// Get the User Control for the plugin's UI
public UserControl GetControl()
{
if (control == null)
{
control = new PixelShiftPluginControl(this);
}
return control;
}
// INotifyPropertyChanged Implementation
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
```
### 3. Create the User Control for the Plugin's UI
This control allows users to adjust the shift amount and the fraction of the frame to shift.
**PixelShiftPluginControl.xaml**
```xml
<UserControl x:Class="PixelShiftPluginNamespace.PixelShiftPluginControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="150" Width="250">
<StackPanel>
<TextBlock Text="Pixel Shift Plugin" FontWeight="Bold" Margin="0,0,0,10" />
<!-- Shift Amount Control -->
<StackPanel Orientation="Horizontal" Margin="0,0,0,5">
<TextBlock Text="Shift Amount:" Width="100" VerticalAlignment="Center" />
<Slider Minimum="0" Maximum="200" Width="120"
Value="{Binding ShiftAmount, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding ShiftAmount}" Width="30" VerticalAlignment="Center" />
</StackPanel>
<!-- Shift Region Fraction Control -->
<StackPanel Orientation="Horizontal">
<TextBlock Text="Region Fraction:" Width="100" VerticalAlignment="Center" />
<Slider Minimum="0.1" Maximum="0.5" Width="120"
Value="{Binding ShiftRegionFraction, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding ShiftRegionFraction, StringFormat={}{0:P0}}" Width="50" VerticalAlignment="Center" />
</StackPanel>
</StackPanel>
</UserControl>
```
**PixelShiftPluginControl.xaml.cs**
```csharp
using SharedInterfaces;
using System.ComponentModel;
using System.Windows.Controls;
namespace PixelShiftPluginNamespace
{
public partial class PixelShiftPluginControl : UserControl
{
public PixelShiftPlugin Plugin { get; private set; }
public PixelShiftPluginControl(PixelShiftPlugin plugin)
{
InitializeComponent();
Plugin = plugin;
this.DataContext = Plugin;
Plugin.PropertyChanged += Plugin_PropertyChanged;
}
private void Plugin_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
// Handle property changes if needed
}
}
}
```
### 4. Compile the Plugin
1. **Build the Project:**
- Ensure there are no compilation errors.
- The output will be a `PixelShiftPlugin.dll` file.
2. **Deploy the Plugin:**
- Copy the `PixelShiftPlugin.dll` to the `Plugins` folder of your WPF Media Player application.
- If the `Plugins` folder does not exist, create it in the application's base directory.
### 5. Testing the Plugin
1. **Launch the WPF Media Player:**
- The application should automatically load all plugins in the `Plugins` folder, including the newly added `PixelShiftPlugin`.
2. **Load a Media File:**
- Drag and drop a supported media file (e.g., `.mp4`, `.avi`) onto the media player or use the "播放" button to browse and select a file.
3. **Enable the Plugin:**
- Click on the "插件列表" (Plugin List) toggle button to open the plugins popup.
- Find the "Pixel Shift Plugin" in the list and ensure the "启用" (Enable) checkbox is checked.
4. **Adjust Plugin Parameters:**
- Expand the "Pixel Shift Plugin" expander to reveal the user control.
- Use the sliders to adjust the shift amount and the fraction of the frame to shift.
- Observe the changes in real-time as the video plays.
5. **Verify Functionality:**
- The central 1/4 of each video frame should have its pixels shifted 40 pixels to the left.
- Adjusting the parameters should dynamically change the shift behavior.
### 6. Additional Notes
- **Performance Considerations:**
- Pixel manipulation in real-time can be performance-intensive. Ensure your system can handle the processing without significant lag.
- **Error Handling:**
- The plugin includes basic error handling. For production use, consider adding more robust error management.
- **Extensibility:**
- This plugin can serve as a foundation for more complex image processing tasks. You can extend its functionality by adding more parameters or implementing different effects.
- **Compatibility:**
- Ensure that the plugin targets the same .NET Framework version as your WPF Media Player to avoid compatibility issues.
## Complete Plugin Code
Below is the complete code for the `PixelShiftPlugin` including all necessary files.
---
### PixelShiftPlugin.cs
```csharp
using SharedInterfaces;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace PixelShiftPluginNamespace
{
public class PixelShiftPlugin : IPluginWithUI, INotifyPropertyChanged
{
// Plugin Name
public string PluginName => "Pixel Shift Plugin";
private bool _isEnabled;
public bool IsEnabled
{
get => _isEnabled;
set
{
if(_isEnabled != value)
{
_isEnabled = value;
OnPropertyChanged(nameof(IsEnabled));
}
}
}
// Parameters Dictionary
public IDictionary<string, object> Parameters { get; private set; }
// User Control for UI
private UserControl control;
// Constructor
public PixelShiftPlugin()
{
Parameters = new Dictionary<string, object>
{
{ "ShiftAmount", 40 }, // Default shift amount in pixels
{ "ShiftRegionFraction", 0.25 } // Default central 1/4 region
};
}
// Initialize Plugin
public void Initialize()
{
// Initialization logic if needed
}
// Property for Shift Amount (pixels)
public int ShiftAmount
{
get => Parameters.ContainsKey("ShiftAmount") ? Convert.ToInt32(Parameters["ShiftAmount"]) : 40;
set
{
if (Parameters.ContainsKey("ShiftAmount"))
{
if ((int)Parameters["ShiftAmount"] != value)
{
Parameters["ShiftAmount"] = value;
OnPropertyChanged(nameof(ShiftAmount));
}
}
else
{
Parameters["ShiftAmount"] = value;
OnPropertyChanged(nameof(ShiftAmount));
}
}
}
// Property for Shift Region Fraction
public double ShiftRegionFraction
{
get => Parameters.ContainsKey("ShiftRegionFraction") ? Convert.ToDouble(Parameters["ShiftRegionFraction"]) : 0.25;
set
{
if (Parameters.ContainsKey("ShiftRegionFraction"))
{
if ((double)Parameters["ShiftRegionFraction"] != value)
{
Parameters["ShiftRegionFraction"] = value;
OnPropertyChanged(nameof(ShiftRegionFraction));
}
}
else
{
Parameters["ShiftRegionFraction"] = value;
OnPropertyChanged(nameof(ShiftRegionFraction));
}
}
}
// Process Video Frame
public BitmapSource ProcessFrame(BitmapSource frame)
{
if (!IsEnabled) // Check if plugin is enabled
return frame;
if (frame == null)
return null;
// Ensure the frame is in Bgra32 format
if (frame.Format != PixelFormats.Bgra32)
{
frame = new FormatConvertedBitmap(frame, PixelFormats.Bgra32, null, 0);
}
int width = frame.PixelWidth;
int height = frame.PixelHeight;
int bytesPerPixel = (frame.Format.BitsPerPixel + 7) / 8;
int stride = width * bytesPerPixel;
byte[] pixelData = new byte[height * stride];
frame.CopyPixels(pixelData, stride, 0);
// Retrieve parameters
int shiftAmount = ShiftAmount;
double shiftRegionFraction = ShiftRegionFraction;
// Calculate central region
int regionWidth = (int)(width * shiftRegionFraction);
int regionStartX = (width - regionWidth) / 2;
int regionEndX = regionStartX + regionWidth;
// Shift pixels in the central region
for (int y = 0; y < height; y++)
{
for (int x = regionStartX; x < regionEndX; x++)
{
int sourceIndex = y * stride + x * bytesPerPixel;
int targetX = x - shiftAmount;
if (targetX < regionStartX)
continue; // Skip if target position is out of bounds
int targetIndex = y * stride + targetX * bytesPerPixel;
// Shift pixel data to the left
pixelData[targetIndex] = pixelData[sourceIndex]; // B
pixelData[targetIndex + 1] = pixelData[sourceIndex + 1]; // G
pixelData[targetIndex + 2] = pixelData[sourceIndex + 2]; // R
pixelData[targetIndex + 3] = pixelData[sourceIndex + 3]; // A
// Optionally, clear the original pixel to visualize the shift
pixelData[sourceIndex] = 0;
pixelData[sourceIndex + 1] = 0;
pixelData[sourceIndex + 2] = 0;
pixelData[sourceIndex + 3] = 255; // Fully opaque
}
}
// Create a new BitmapSource from the modified pixel data
var modifiedFrame = BitmapSource.Create(width, height, frame.DpiX, frame.DpiY,
PixelFormats.Bgra32, null, pixelData, stride);
return modifiedFrame;
}
// Get the User Control for the plugin's UI
public UserControl GetControl()
{
if (control == null)
{
control = new PixelShiftPluginControl(this);
}
return control;
}
// INotifyPropertyChanged Implementation
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
```
---
### PixelShiftPluginControl.xaml
```xml
<UserControl x:Class="PixelShiftPluginNamespace.PixelShiftPluginControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="150" Width="250">
<StackPanel>
<TextBlock Text="Pixel Shift Plugin" FontWeight="Bold" Margin="0,0,0,10" />
<!-- Shift Amount Control -->
<StackPanel Orientation="Horizontal" Margin="0,0,0,5">
<TextBlock Text="Shift Amount:" Width="100" VerticalAlignment="Center" />
<Slider Minimum="0" Maximum="200" Width="120"
Value="{Binding ShiftAmount, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding ShiftAmount}" Width="30" VerticalAlignment="Center" />
</StackPanel>
<!-- Shift Region Fraction Control -->
<StackPanel Orientation="Horizontal">
<TextBlock Text="Region Fraction:" Width="100" VerticalAlignment="Center" />
<Slider Minimum="0.1" Maximum="0.5" Width="120"
Value="{Binding ShiftRegionFraction, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding ShiftRegionFraction, StringFormat={}{0:P0}}" Width="50" VerticalAlignment="Center" />
</StackPanel>
</StackPanel>
</UserControl>
```
---
### PixelShiftPluginControl.xaml.cs
```csharp
using SharedInterfaces;
using System.ComponentModel;
using System.Windows.Controls;
namespace PixelShiftPluginNamespace
{
public partial class PixelShiftPluginControl : UserControl
{
public PixelShiftPlugin Plugin { get; private set; }
public PixelShiftPluginControl(PixelShiftPlugin plugin)
{
InitializeComponent();
Plugin = plugin;
this.DataContext = Plugin;
Plugin.PropertyChanged += Plugin_PropertyChanged;
}
private void Plugin_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
// Handle property changes if needed
}
}
}
```
---
## Final Notes
- **Data Binding:** The plugin uses data binding to connect slider controls to its parameters (`ShiftAmount` and `ShiftRegionFraction`). Adjusting these sliders will update the parameters in real-time, allowing dynamic changes to the video processing behavior.
- **Performance:** While this plugin performs per-pixel operations, it is optimized for simplicity. For more intensive processing or higher performance, consider leveraging parallel processing or GPU acceleration.
- **Extensibility:** This plugin serves as a template. You can extend its functionality by adding more parameters, implementing additional effects, or enhancing the user interface.
- **Error Handling:** Ensure robust error handling in production environments to handle unexpected scenarios gracefully.
By following the steps above and integrating the provided code, you can successfully create and test a DLL plugin for your WPF Media Player that performs pixel shifting on video frames.