您好!您的问题是关于如何使用C#从WMV文件中获取帧。
首先,WMV(Windows Media Video)是微软公司开发的一种视频格式,它可以在Windows Media Player中播放。要从WMV文件中获取帧,您可以使用Windows Media Foundation(WMF)库或DirectShow库。
以下是使用Windows Media Foundation库从WMV文件中获取帧的示例代码:
using System;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using Microsoft.WindowsMediaFoundation;
namespace WMVPlayer
{
public partial class Form1 : Form
{
private const int MF_SOURCE_READER_FIRST_VIDEO_STREAM = 0xFFFFFFFE;
private const int MF_SOURCE_READER_ALL_STREAMS = 0xFFFFFFFF;
private IMFSourceReader sourceReader;
private IMFMediaType mediaType;
private IMFSample sample;
private Bitmap bitmap;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "WMV files (*.wmv)|*.wmv";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
textBox1.Text = openFileDialog.FileName;
InitializePlayer(openFileDialog.FileName);
}
}
private void InitializePlayer(string fileName)
{
// Create the source reader
sourceReader = (IMFSourceReader)new MFSourceReader();
// Create the media type
mediaType = (IMFMediaType)new MFVideoMediaType();
// Set the video format
mediaType.SetGUID(MFAttributesClsid.MF_MT_MAJOR_TYPE, MFMediaType.MFMediaType_Video);
mediaType.SetGUID(MFAttributesClsid.MF_MT_SUBTYPE, MFMediaType.MFVideoFormat_RGB32);
// Create the sample
sample = (IMFSample)new MFSample();
// Create the bitmap
bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height, PixelFormat.Format32bppArgb);
// Initialize the source reader
sourceReader.SetStreamSelection(MF_SOURCE_READER_ALL_STREAMS, false);
sourceReader.SetStreamSelection(MF_SOURCE_READER_FIRST_VIDEO_STREAM, true);
sourceReader.SetCurrentMediaType(MF_SOURCE_READER_FIRST_VIDEO_STREAM, IntPtr.Zero, mediaType);
// Read the first frame
ReadFrame();
}
private void ReadFrame()
{
int hr = sourceReader.ReadSample(MF_SOURCE_READER_FIRST_VIDEO_STREAM, 0, IntPtr.Zero, 0, IntPtr.Zero, IntPtr.Zero);
if (hr == 0)
{
// Get the sample from the source reader
sourceReader.GetSample(MF_SOURCE_READER_FIRST_VIDEO_STREAM, sample);
// Get the buffer from the sample
IMFMediaBuffer mediaBuffer = (IMFMediaBuffer)sample;
// Lock the buffer
mediaBuffer.Lock(out IntPtr buffer, out int maxLength, out int currentLength);
// Copy the buffer to the bitmap
Marshal.Copy(buffer, bitmap.Scan0, 0, currentLength);
// Unlock the buffer
mediaBuffer.Unlock();
// Draw the bitmap
pictureBox1.Image = bitmap;
}
}
private void timer1_Tick(object sender, EventArgs e)
{
ReadFrame();
}
}
}
这个示例代码将打开一个WMV文件,并在窗口中显示每一帧。您可以使用Windows Media Foundation库或DirectShow库来实现更高级的功能,例如音频处理、视频编辑、视频渲染等。
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