开始在特定时间停止的MediaElement [英] Start and stop MediaElement at specific times
本文介绍了开始在特定时间停止的MediaElement的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在改变应用WPF中，它扮演的音频和视频和图片都基于定时事件。我用串MciCommand =的String.Format（播放从帧{0} {1} {2} 之前。
I am change an app over to WPF, it plays audio and video and pictures all based on timed events .. I used "string MciCommand = string.Format("play frames FROM {0} to {1} {2}"" , before.
我一直在寻找，并试图在WPF C＃现在来解决这个问题。
I have been searching and trying to fix this problem now in WPF c#
- 我有一个视频（WMV），我有需要被一起玩。
例如.. SECTION1启动（200毫秒），停止（250毫秒）第2节开始（5000毫秒），停止（15000ms）多个节 - 终于我需要它停留在AA静态画面。 使用
我曾尝试一个定时器和一个空while循环，它不寻求正确。
我很茫然媒体元素似乎不支持这种类型的使用。我想到了wpfmediakit和直接显示是很难包住我的新手WPF周围的技能。
I have tried using a timer, and a empty while loop and it doesn't seek properly. I am at a loss media element doesn't seem to support this type of use. I thought about wpfmediakit and direct show is very hard to wrap my novice wpf skills around.
任何帮助将不胜感激...
any help would be greatly appreciated...
推荐答案
这是我怎么会解决我的问题..我用属性的列表，并用它就像一个剧本，我遍历。并且如果在比结束时间大的位置。它触发定时器并进入到下一个项目列表中的..还有一些事情可以作出多一点精致..像textbox4更改事件也触发NEXT_ITEM但它可以完成工作...现在...
我希望这可以帮助别人有同样的问题...
this was how I ended up solving my problem .. I used a list of properties and used it like a script that I loop through . and if the position in larger than the end time. it trigger the timer and goes to the next item in the list .. there is still some things that could be made a bit more refined .. like the textbox4 changed event also triggers next_item but it gets the job done .. for now .. Hopefully this helps someone with the same issue ...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.ComponentModel;
using System.Threading;
namespace WpfApplication6
{
public partial class MainWindow : Window
{
BackgroundWorker position = new BackgroundWorker();
BackgroundWorker test_position = new BackgroundWorker();
public List<video_script> script_list = new List<video_script>();
int scrip_index;
public class video_script
{
public string action { get; set; }
public TimeSpan start_time { get; set; }
public TimeSpan endtime { get; set; }
public string filename { get; set; }
}
private void position_DoWork(object sender, DoWorkEventArgs e)
{
Thread.Sleep(100);
}
private void position_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (mediaElement1.Position > TimeSpan.FromMilliseconds(Convert.ToInt32(tb_endtime.Text)))
{
next_item();
}
else position.RunWorkerAsync();
textBox4.Text = "Play";
textBox3.Text = mediaElement1.Position.ToString();
}
public MainWindow()
{
InitializeComponent();
position.DoWork += new DoWorkEventHandler(position_DoWork);
position.RunWorkerCompleted += new RunWorkerCompletedEventHandler(position_RunWorkerCompleted);
position.WorkerSupportsCancellation = true;
test_position.DoWork += new DoWorkEventHandler(test_position_DoWork);
test_position.RunWorkerCompleted += new RunWorkerCompletedEventHandler(test_position_RunWorkerCompleted);
test_position.WorkerSupportsCancellation = true;
}
private void Mediasource_Click(object sender, RoutedEventArgs e)
{
if (!position.IsBusy) position.RunWorkerAsync();
mediaElement1.Source = new Uri(tb_filename.Text);
mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.ScrubbingEnabled = true;
mediaElement1.Play();
}
private void stopbutton_Click(object sender, RoutedEventArgs e)
{
mediaElement1.Stop();
}
private void Playbutton_Click(object sender, RoutedEventArgs e)
{
scrip_index = 0;
mediaElement1.Play();
mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.ScrubbingEnabled = true;
}
private void pausebutton_Click(object sender, RoutedEventArgs e)
{
if (mediaElement1.CanPause)
{
mediaElement1.Pause();
}
}
private void AddToListbutton_Click(object sender, RoutedEventArgs e)
{
video_script temp_item = new video_script();
temp_item.filename = tb_filename.Text;
temp_item.start_time = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_starttime.Text));
temp_item.endtime = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_endtime.Text));
temp_item.action = tb_action.Text;
script_list.Add(temp_item);
listBox1.Items.Add(temp_item.filename + " | " + tb_starttime.Text + " | " + tb_endtime.Text + " | " + tb_action.Text);
}
private void positionbox_TextChanged(object sender, TextChangedEventArgs e)
{
if (script_list.Count != 0)
{
if (script_list[scrip_index].endtime < mediaElement1.Position) next_item();
}
}
#region test button area
private void next_item()
{
if (scrip_index < script_list.Count() - 1)
{
scrip_index++;
switch (script_list[scrip_index].action)
{
case "Load":
mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
if (mediaElement1.Source != new Uri(script_list[scrip_index].filename)) mediaElement1.Source = new Uri(script_list[scrip_index].filename);
mediaElement1.ScrubbingEnabled = true;
playing = false;
next_item();
break;
case "Play":
mediaElement1.Play();
playing = true;
if(!test_position.IsBusy) test_position.RunWorkerAsync();
break;
case "Pause":
mediaElement1.Pause();
playing = false;
break;
case "Seek":
mediaElement1.Position = script_list[scrip_index].start_time;
playing = true;
break;
case "Stop":
mediaElement1.Stop();
playing = false;
break;
}
}
}
private void test_position_DoWork(object sender, DoWorkEventArgs e)
{
Thread.Sleep(100);
}
private void test_position_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (mediaElement1.Position > script_list[scrip_index].endtime )
{
next_item();
}
else test_position.RunWorkerAsync();
textBox4.Text = "Play";
textBox3.Text = mediaElement1.Position.ToString();
if (playing && !test_position.IsBusy) test_position.RunWorkerAsync();
}
private void testbutton_Click(object sender, RoutedEventArgs e)
{
if (mediaElement1.Source != new Uri(tb_filename.Text)) mediaElement1.Source = new Uri(tb_filename.Text);
mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
mediaElement1.Play();
mediaElement1.ScrubbingEnabled = true;
mediaElement1.Position = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_starttime.Text));
if (test_position.IsBusy) test_position.CancelAsync();
if (!test_position.IsBusy) test_position.RunWorkerAsync();
}
bool playing;
#endregion
#region slider region
private void slider1_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (slider1.Value > slider2.Value) slider2.Value = slider1.Value - 1;
}
private void slidermax_values_TextChanged(object sender, TextChangedEventArgs e)
{
slider1.Maximum = Convert.ToInt32(tb_slider_maxvalue.Text);
slider2.Maximum = Convert.ToInt32(tb_slider_maxvalue.Text);
}
private void slider2_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
if (slider2.Value < slider1.Value) slider1.Value = slider2.Value - 1;
}
#endregion
private void start_script_Click(object sender, RoutedEventArgs e)
{
scrip_index = -1;
next_item();
}
private void mediaElement1_MediaOpened(object sender, RoutedEventArgs e)
{
}
}
}
这里是XAML中，我用于测试的形式....
here is the Xaml for the form that I used for testing....
<Window x:Class="WpfApplication6.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="402" Width="922" WindowStyle="ThreeDBorderWindow">
<Grid>
<Button Content="mediasource load" Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="Mediasource_Click" />
<Button Content="play" Height="23" HorizontalAlignment="Left" Margin="10,43,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="Playbutton_Click" />
<Button Content="stop" Height="23" HorizontalAlignment="Left" Margin="10,142,0,0" Name="button5" VerticalAlignment="Top" Width="75" Click="stopbutton_Click" />
<Button Content="Pause" Height="23" HorizontalAlignment="Left" Margin="12,171,0,0" Name="button6" VerticalAlignment="Top" Width="75" Click="pausebutton_Click" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="165,296,0,0" Name="tb_starttime" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=slider1, Path=Value, Mode=TwoWay}" />
<TextBox Height="23" HorizontalAlignment="Right" Margin="0,296,426,0" Name="tb_endtime" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=slider2, Path=Value, Mode=TwoWay}" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="630,281,0,0" Name="textBox3" VerticalAlignment="Top" Width="120" TextChanged="positionbox_TextChanged" IsReadOnly="False" Text="{Binding ElementName=mediaElement1, Path=Position.Milliseconds, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="490,281,0,0" Name="textBox4" VerticalAlignment="Top" Width="134" />
<Label Content="filename" Height="28" HorizontalAlignment="Left" Margin="104,325,0,0" Name="label1" VerticalAlignment="Top" />
<ListBox Height="215" HorizontalAlignment="Left" Margin="469,10,0,0" Name="listBox1" VerticalAlignment="Top" Width="431" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="165,325,0,0" Name="tb_filename" VerticalAlignment="Top" Width="213" Text="C:\Data\001femod1\vid\dat1.avi" AcceptsTab="False" />
<Label Content="end time" Height="28" HorizontalAlignment="Left" Margin="291,294,0,0" Name="label2" VerticalAlignment="Top" />
<Label Content="start time" Height="28" HorizontalAlignment="Left" Margin="104,296,0,0" Name="label3" VerticalAlignment="Top" />
<Button Content="add to list" Height="23" HorizontalAlignment="Left" Margin="11,315,0,0" Name="button7" VerticalAlignment="Top" Width="75" Click="AddToListbutton_Click" />
<Label Content="Action" Height="28" HorizontalAlignment="Left" Margin="384,325,0,0" Name="label4" VerticalAlignment="Top" />
<ComboBox Height="23" HorizontalAlignment="Left" Margin="434,326,0,0" Name="tb_action" VerticalAlignment="Top" Width="120">
<ComboBoxItem Content="Play" />
<ComboBoxItem Content="Load" />
<ComboBoxItem Content="Stop" />
<ComboBoxItem Content="Pause" />
<ComboBoxItem Content="Seek" />
</ComboBox>
<Button Content="test times" Height="23" HorizontalAlignment="Left" Margin="50,246,0,0" Name="tb_test" VerticalAlignment="Top" Width="75" Click="testbutton_Click" />
<Slider Height="23" Margin="147,231,170,0" Name="slider1" VerticalAlignment="Top" SmallChange="1" LargeChange="10" IsSelectionRangeEnabled="False" IsMoveToPointEnabled="True" IsSnapToTickEnabled="True" ValueChanged="slider1_ValueChanged" />
<Slider Height="23" HorizontalAlignment="Left" Margin="147,260,0,0" Name="slider2" VerticalAlignment="Top" Width="583" SmallChange="1" IsSnapToTickEnabled="True" ValueChanged="slider2_ValueChanged" />
<Label Content="max value" Height="28" HorizontalAlignment="Left" Margin="736,226,0,0" Name="label5" VerticalAlignment="Top" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="736,247,0,0" Name="tb_slider_maxvalue" VerticalAlignment="Top" Width="120" Text="74000" TextChanged="slidermax_values_TextChanged" />
<Button Content="start script" Height="23" HorizontalAlignment="Left" Margin="10,281,0,0" Name="button3" VerticalAlignment="Top" Width="75" Click="start_script_Click" />
<MediaElement Height="215" HorizontalAlignment="Left" Margin="91,10,0,0" Name="mediaElement1" VerticalAlignment="Top" Width="372" MediaOpened="mediaElement1_MediaOpened" />
</Grid>
</Window>
这篇关于开始在特定时间停止的MediaElement的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
