有没有办法在程序中伪造DirectShow过滤器?
本文关键字：伪造 DirectShow 过滤器 程序 有没有 | 更新日期: 2023-09-27 18:05:03
我有一个IP摄像机，它通过网络接收包含图像的字符缓冲区。我不能访问它，直到我设置连接到它在一个程序。我试图剖析windows源过滤器代码，我不是走得很快，所以我想我会问是否有可能只是采取这样的缓冲，并将其转换为可以连接一个引脚到AVISplitter或诸如Directshow/.net的东西
(video buffer from IP Cam) -> (???) -> (AVI Splitter) -> (Profit)
我有我的程序在一个命名空间中捕获视频，我有这个代码从GSSF在它自己的命名空间。我将带有图像的ptr从cam名称空间传递到GSSF名称空间。这只发生一次，但是图形从这一张图像中流，而摄像机从网络中流。是否有一种方法可以不断地将缓冲区从cam传递到GSSF，或者我应该以某种方式组合名称空间?我尝试将主摄像机指针发送到GSSF，但它崩溃了，因为它正在访问指针并正在写入。也许如果我抓取一个图像，传递指针，等待抓取一个新的?
* 更新*
我缩小了我的代码，我不相信我做的命名空间是正确的，现在我看它。
namespace Cam_Controller
{
static byte[] mainbyte = new byte[1280*720*2];
static IntPtr main_ptr = new IntPtr();
//(this function is threaded)
static void Trial(NPvBuffer mBuffer, NPvDisplayWnd mDisplayWnd, VideoCompression compressor)
{
Functions function = new Functions();
Defines define = new Defines();
NPvResult operationalResult = new NPvResult();
VideoCompression mcompressor = new VideoCompression();
int framecount = 0;
while (!Stopping && AcquiringImages)
{
Mutex lock_video = new Mutex();
NPvResult result = mDevice.RetrieveNextBuffer(mBuffer, operationalResult);
if(result.isOK())
{
framecount++;
wer = (int)mDisplayWnd.Display(mBuffer, wer);
main_ptr = (IntPtr)mBuffer.GetMarshalledBuffer();
Marshal.Copy(main_ptr, mainbyte, 0, 720 * 2560);
}
}
}
private void button7_Click(object sender, EventArgs e)
{
IntPtr dd = (IntPtr)mBuffer.GetMarshalledBuffer();
Marshal.Copy(dd, main_byte1, 0, 720 * 2560);
play = new VisiCam_Controller.DxPlay.DxPlay("", panel9, main_byte1);
play.Start();
}
namespace DxPlay
{
public class DxPlay
{
public DxPlay(string sPath, Control hWin, byte[] color)
{
try
{
// pick one of our image providers
//m_ImageHandler = new ImageFromFiles(sPath, 24);
m_ImageHandler = new ImageFromPixels(20, color);
//m_ImageHandler = new ImageFromMpg(@"c:'c1.mpg");
//m_ImageHandler = new ImageFromMpg(sPath);
//m_ImageHandler = new ImageFromMP3(@"c:'vss'media'track3.mp3");
// Set up the graph
SetupGraph(hWin);
}
catch
{
Dispose();
throw;
}
}
}
abstract internal class imagehandler
internal class imagefrompixels
{
private int[] mainint = new int[720 * 1280];
unsafe public ImageFromPixels(long FPS, byte[] x)
{
long fff = 720 * 1280 * 3;
mainptr = new IntPtr(fff);
for (int p = 0; p < 720 * 640; p++)
{
U = (x[ p * 4 + 0]);
Y = (x[p * 4 + 1]);
V = (x[p * 4 + 2]);
Y2 = (x[p * 4 + 3]);
int one = V << 16 | Y << 8 | U;
int two = V << 16 | Y2 << 8 | U;
mainint[p * 2 + 0] = one;
mainint[p * 2 + 1] = two;
}
m_FPS = UNIT / FPS;
m_b = 211;
m_g = 197;
}
}
}
}
也有GetImage，但这是相对相同的，复制缓冲区到指针。发生的是我抓取图像的缓冲区并将其发送到DxPlay类。它能够处理它，并把它放在directshow线没有问题;但它从不更新也不被更新，因为它只有一个缓冲区。如果我向DxPlay发送包含图像缓冲区地址的IntPtr，则代码在访问内存时崩溃，因为我假设ImageFromPixels代码(现在不在那里)(change
)(x[p * 4 + #])
(IntPtr)((x-passed as an IntPtr).toInt64()+p*4 + #)
)在Cam_Controller类编辑指针时访问指针的内存。我制作并传递IntPtrs和新IntPtrs的副本，但它们在转换中途失败。
如果你想在。net中这样做，需要以下步骤:
-
使用DirectShow。. NET通用样本源过滤器(GSSF. ax)从样本包内的Misc/GSSF目录。源过滤器总是一个COM模块，所以你需要使用"RegSvr32 GSSF.ax"来注册它。
-
在。net中实现位图提供程序
-
设置一个图形，并将GSSF的引脚连接到位图提供程序的实现。
-
祈祷。
我在一个项目中使用以下代码，并使其可重用以供将来使用。
代码(不是最好的，没有完成，但一个工作的开始)(这需要一个IVideoSource，下面):
public class VideoSourceToVideo : IDisposable
{
object locker = new object();
public event EventHandler<EventArgs> Starting;
public event EventHandler<EventArgs> Stopping;
public event EventHandler<EventArgs> Completed;
/// <summary> graph builder interface. </summary>
private DirectShowLib.ICaptureGraphBuilder2 captureGraphBuilder = null;
DirectShowLib.IMediaControl mediaCtrl = null;
IMediaEvent mediaEvent = null;
bool stopMediaEventLoop = false;
Thread mediaEventThread;
/// <summary> Dimensions of the image, calculated once in constructor. </summary>
private readonly VideoInfoHeader videoInfoHeader;
IVideoSource source;
public VideoSourceToVideo(IVideoSource source, string destFilename, string encoderName)
{
try
{
this.source = source;
// Set up the capture graph
SetupGraph(destFilename, encoderName);
}
catch
{
Dispose();
throw;
}
}
/// <summary> release everything. </summary>
public void Dispose()
{
StopMediaEventLoop();
CloseInterfaces();
}
/// <summary> build the capture graph for grabber. </summary>
private void SetupGraph(string destFilename, string encoderName)
{
int hr;
// Get the graphbuilder object
captureGraphBuilder = new DirectShowLib.CaptureGraphBuilder2() as DirectShowLib.ICaptureGraphBuilder2;
IFilterGraph2 filterGraph = new DirectShowLib.FilterGraph() as DirectShowLib.IFilterGraph2;
mediaCtrl = filterGraph as DirectShowLib.IMediaControl;
IMediaFilter mediaFilt = filterGraph as IMediaFilter;
mediaEvent = filterGraph as IMediaEvent;
captureGraphBuilder.SetFiltergraph(filterGraph);
IBaseFilter aviMux;
IFileSinkFilter fileSink = null;
hr = captureGraphBuilder.SetOutputFileName(MediaSubType.Avi, destFilename, out aviMux, out fileSink);
DsError.ThrowExceptionForHR(hr);
DirectShowLib.IBaseFilter compressor = DirectShowUtils.GetVideoCompressor(encoderName);
if (compressor == null)
{
throw new InvalidCodecException(encoderName);
}
hr = filterGraph.AddFilter(compressor, "compressor");
DsError.ThrowExceptionForHR(hr);
// Our data source
IBaseFilter source = (IBaseFilter)new GenericSampleSourceFilter();
// Get the pin from the filter so we can configure it
IPin ipin = DsFindPin.ByDirection(source, PinDirection.Output, 0);
try
{
// Configure the pin using the provided BitmapInfo
ConfigurePusher((IGenericSampleConfig)ipin);
}
finally
{
Marshal.ReleaseComObject(ipin);
}
// Add the filter to the graph
hr = filterGraph.AddFilter(source, "GenericSampleSourceFilter");
Marshal.ThrowExceptionForHR(hr);
hr = filterGraph.AddFilter(source, "source");
DsError.ThrowExceptionForHR(hr);
hr = captureGraphBuilder.RenderStream(null, null, source, compressor, aviMux);
DsError.ThrowExceptionForHR(hr);
IMediaPosition mediaPos = filterGraph as IMediaPosition;
hr = mediaCtrl.Run();
DsError.ThrowExceptionForHR(hr);
}
private void ConfigurePusher(IGenericSampleConfig ips)
{
int hr;
source.SetMediaType(ips);
// Specify the callback routine to call with each sample
hr = ips.SetBitmapCB(source);
DsError.ThrowExceptionForHR(hr);
}
private void StartMediaEventLoop()
{
mediaEventThread = new Thread(MediaEventLoop)
{
Name = "Offscreen Vid Player Medialoop",
IsBackground = false
};
mediaEventThread.Start();
}
private void StopMediaEventLoop()
{
stopMediaEventLoop = true;
if (mediaEventThread != null)
{
mediaEventThread.Join();
}
}
public void MediaEventLoop()
{
MediaEventLoop(x => PercentageCompleted = x);
}
public double PercentageCompleted
{
get;
private set;
}
// FIXME this needs some work, to be completely in-tune with needs.
public void MediaEventLoop(Action<double> UpdateProgress)
{
mediaEvent.CancelDefaultHandling(EventCode.StateChange);
//mediaEvent.CancelDefaultHandling(EventCode.Starvation);
while (stopMediaEventLoop == false)
{
try
{
EventCode ev;
IntPtr p1, p2;
if (mediaEvent.GetEvent(out ev, out p1, out p2, 0) == 0)
{
switch (ev)
{
case EventCode.Complete:
Stopping.Fire(this, null);
if (UpdateProgress != null)
{
UpdateProgress(source.PercentageCompleted);
}
return;
case EventCode.StateChange:
FilterState state = (FilterState)p1.ToInt32();
if (state == FilterState.Stopped || state == FilterState.Paused)
{
Stopping.Fire(this, null);
}
else if (state == FilterState.Running)
{
Starting.Fire(this, null);
}
break;
// FIXME add abort and stuff, and propagate this.
}
// Trace.WriteLine(ev.ToString() + " " + p1.ToInt32());
mediaEvent.FreeEventParams(ev, p1, p2);
}
else
{
if (UpdateProgress != null)
{
UpdateProgress(source.PercentageCompleted);
}
// FiXME use AutoResetEvent
Thread.Sleep(100);
}
}
catch (Exception e)
{
Trace.WriteLine("MediaEventLoop: " + e);
}
}
}
/// <summary> Shut down capture </summary>
private void CloseInterfaces()
{
int hr;
try
{
if (mediaCtrl != null)
{
// Stop the graph
hr = mediaCtrl.Stop();
mediaCtrl = null;
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
if (captureGraphBuilder != null)
{
Marshal.ReleaseComObject(captureGraphBuilder);
captureGraphBuilder = null;
}
GC.Collect();
}
public void Start()
{
StartMediaEventLoop();
}
}
IVideoSource:
public interface IVideoSource : IGenericSampleCB
{
double PercentageCompleted { get; }
int GetImage(int iFrameNumber, IntPtr ip, int iSize, out int iRead);
void SetMediaType(global::IPerform.Video.Conversion.Interops.IGenericSampleConfig psc);
int SetTimeStamps(global::DirectShowLib.IMediaSample pSample, int iFrameNumber);
}
ImageVideoSource(主要取自DirectShow。净的例子):
// A generic class to support easily changing between my different sources of data.
// Note: You DON'T have to use this class, or anything like it. The key is the SampleCallback
// routine. How/where you get your bitmaps is ENTIRELY up to you. Having SampleCallback call
// members of this class was just the approach I used to isolate the data handling.
public abstract class ImageVideoSource : IDisposable, IVideoSource
{
#region Definitions
/// <summary>
/// 100 ns - used by a number of DS methods
/// </summary>
private const long UNIT = 10000000;
#endregion
/// <summary>
/// Number of callbacks that returned a positive result
/// </summary>
private int m_iFrameNumber = 0;
virtual public void Dispose()
{
}
public abstract double PercentageCompleted { get; protected set; }
abstract public void SetMediaType(IGenericSampleConfig psc);
abstract public int GetImage(int iFrameNumber, IntPtr ip, int iSize, out int iRead);
virtual public int SetTimeStamps(IMediaSample pSample, int iFrameNumber)
{
return 0;
}
/// <summary>
/// Called by the GenericSampleSourceFilter. This routine populates the MediaSample.
/// </summary>
/// <param name="pSample">Pointer to a sample</param>
/// <returns>0 = success, 1 = end of stream, negative values for errors</returns>
virtual public int SampleCallback(IMediaSample pSample)
{
int hr;
IntPtr pData;
try
{
// Get the buffer into which we will copy the data
hr = pSample.GetPointer(out pData);
if (hr >= 0)
{
// Set TRUE on every sample for uncompressed frames
hr = pSample.SetSyncPoint(true);
if (hr >= 0)
{
// Find out the amount of space in the buffer
int cbData = pSample.GetSize();
hr = SetTimeStamps(pSample, m_iFrameNumber);
if (hr >= 0)
{
int iRead;
// Get copy the data into the sample
hr = GetImage(m_iFrameNumber, pData, cbData, out iRead);
if (hr == 0) // 1 == End of stream
{
pSample.SetActualDataLength(iRead);
// increment the frame number for next time
m_iFrameNumber++;
}
}
}
}
}
finally
{
// Release our pointer the the media sample. THIS IS ESSENTIAL! If
// you don't do this, the graph will stop after about 2 samples.
Marshal.ReleaseComObject(pSample);
}
return hr;
}
}
RawVideoSource (DirectShow管道的一个具体托管源生成器的例子):
internal class RawVideoSource : ImageVideoSource
{
private byte[] buffer;
private byte[] demosaicBuffer;
private RawVideoReader reader;
public override double PercentageCompleted
{
get;
protected set;
}
public RawVideoSource(string sourceFile)
{
reader = new RawVideoReader(sourceFile);
}
override public void SetMediaType(IGenericSampleConfig psc)
{
BitmapInfoHeader bmi = new BitmapInfoHeader();
bmi.Size = Marshal.SizeOf(typeof(BitmapInfoHeader));
bmi.Width = reader.Header.VideoSize.Width;
bmi.Height = reader.Header.VideoSize.Height;
bmi.Planes = 1;
bmi.BitCount = 24;
bmi.Compression = 0;
bmi.ImageSize = (bmi.BitCount / 8) * bmi.Width * bmi.Height;
bmi.XPelsPerMeter = 0;
bmi.YPelsPerMeter = 0;
bmi.ClrUsed = 0;
bmi.ClrImportant = 0;
int hr = psc.SetMediaTypeFromBitmap(bmi, 0);
buffer = new byte[reader.Header.FrameSize];
demosaicBuffer = new byte[reader.Header.FrameSize * 3];
DsError.ThrowExceptionForHR(hr);
}
long startFrameTime;
long endFrameTime;
unsafe override public int GetImage(int iFrameNumber, IntPtr ip, int iSize, out int iRead)
{
int hr = 0;
if (iFrameNumber < reader.Header.NumberOfFrames)
{
reader.ReadFrame(buffer, iFrameNumber, out startFrameTime, out endFrameTime);
Demosaic.DemosaicGBGR24Bilinear(buffer, demosaicBuffer, reader.Header.VideoSize);
Marshal.Copy(demosaicBuffer, 0, ip, reader.Header.FrameSize * 3);
PercentageCompleted = ((double)iFrameNumber / reader.Header.NumberOfFrames) * 100.0;
}
else
{
PercentageCompleted = 100;
hr = 1; // End of stream
}
iRead = iSize;
return hr;
}
override public int SetTimeStamps(IMediaSample pSample, int iFrameNumber)
{
reader.ReadTimeStamps(iFrameNumber, out startFrameTime, out endFrameTime);
DsLong rtStart = new DsLong(startFrameTime);
DsLong rtStop = new DsLong(endFrameTime);
int hr = pSample.SetTime(rtStart, rtStop);
return hr;
}
}
和GSSF的互操作。AX COM:
namespace IPerform.Video.Conversion.Interops
{
[ComImport, Guid("6F7BCF72-D0C2-4449-BE0E-B12F580D056D")]
public class GenericSampleSourceFilter
{
}
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("33B9EE57-1067-45fa-B12D-C37517F09FC0")]
public interface IGenericSampleCB
{
[PreserveSig]
int SampleCallback(IMediaSample pSample);
}
[Guid("CE50FFF9-1BA8-4788-8131-BDE7D4FFC27F"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IGenericSampleConfig
{
[PreserveSig]
int SetMediaTypeFromBitmap(BitmapInfoHeader bmi, long lFPS);
[PreserveSig]
int SetMediaType([MarshalAs(UnmanagedType.LPStruct)] AMMediaType amt);
[PreserveSig]
int SetMediaTypeEx([MarshalAs(UnmanagedType.LPStruct)] AMMediaType amt, int lBufferSize);
[PreserveSig]
int SetBitmapCB(IGenericSampleCB pfn);
}
}
祝你好运，试着用这个让它工作。或者提出进一步的问题，以便我们解决其他问题。