DirectShow虚拟摄像头源码， flash qq 可用

//------------------------------------------------------------------------------ // File: PushSourceDesktop.cpp // // Desc: DirectShow sample code - In-memory push mode source filter // Provides an image of the user's desktop as a continuously updating stream. // // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ #include <streams.h> #include "PushSourceDesktop.h" #include "DibHelper.h" /********************************************** * * CPushPinDesktop Class * * **********************************************/ CPushPinDesktop::CPushPinDesktop(HRESULT *phr, CSource *pFilter) : CSourceStream(NAME("Push Source Desktop"), phr, pFilter, L"Out"), m_FramesWritten(0), m_bZeroMemory(0), m_iFrameNumber(0), m_rtFrameLength(FPS_5), // Capture and display desktop 5 times per second m_nCurrentBitDepth(32) { m_pParent = (CPushSourceDesktop*)pFilter; m_hCursor = LoadCursor(0, MAKEINTRESOURCE(IDC_ARROW)); // The main point of this sample is to demonstrate how to take a DIB // in host memory and insert it into a video stream. // To keep this sample as simple as possible, we just read the desktop image // from a file and copy it into every frame that we send downstream. // // In the filter graph, we connect this filter to the AVI Mux, which creates // the AVI file with the video frames we pass to it. In this case, // the end result is a screen capture video (GDI images only, with no // support for overlay surfaces). // Get the device context of the main display HDC hDC; hDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL); // Get the dimensions of the main desktop window m_rScreen.left = m_rScreen.top = 0; m_rScreen.right = GetDeviceCaps(hDC, HORZRES); m_rScreen.bottom = GetDeviceCaps(hDC, VERTRES); // Save dimensions for later use in FillBuffer() m_iImageWidth = m_rScreen.right - m_rScreen.left; m_iImageHeight = m_rScreen.bottom - m_rScreen.top; // Release the device context DeleteDC(hDC); } CPushPinDesktop::~CPushPinDesktop() { DbgLog((LOG_TRACE, 3, TEXT("Frames written %d"), m_iFrameNumber)); } // // GetMediaType // // Prefer 5 formats - 8, 16 (*2), 24 or 32 bits per pixel // // Prefered types should be ordered by quality, with zero as highest quality. // Therefore, iPosition = // 0 Return a 32bit mediatype // 1 Return a 24bit mediatype // 2 Return 16bit RGB565 // 3 Return a 16bit mediatype (rgb555) // 4 Return 8 bit palettised format // >4 Invalid // HRESULT CPushPinDesktop::GetMediaType(int iPosition, CMediaType *pmt) { CheckPointer(pmt,E_POINTER); CAutoLock cAutoLock(m_pFilter->pStateLock()); if(iPosition < 0) return E_INVALIDARG; // Have we run off the end of types? if(iPosition > 4) return VFW_S_NO_MORE_ITEMS; VIDEOINFO *pvi = (VIDEOINFO *) pmt->AllocFormatBuffer(sizeof(VIDEOINFO)); if(NULL == pvi) return(E_OUTOFMEMORY); // Initialize the VideoInfo structure before configuring its members ZeroMemory(pvi, sizeof(VIDEOINFO)); switch(iPosition) { case 0: { // Return our highest quality 32bit format // Since we use RGB888 (the default for 32 bit), there is // no reason to use BI_BITFIELDS to specify the RGB // masks. Also, not everything supports BI_BITFIELDS pvi->bmiHeader.biCompression = BI_RGB; pvi->bmiHeader.biBitCount = 32; break; } case 1: { // Return our 24bit format pvi->bmiHeader.biCompression = BI_RGB; pvi->bmiHeader.biBitCount = 24; break; } case 2: { // 16 bit per pixel RGB565 // Place the RGB masks as the first 3 doublewords in the palette area for(int i = 0; i < 3; i++) pvi->TrueColorInfo.dwBitMasks[i] = bits565[i]; pvi->bmiHeader.biCompression = BI_BITFIELDS; pvi->bmiHeader.biBitCount = 16; break; } case 3: { // 16 bits per pixel RGB555 // Place the RGB masks as the first 3 doublewords in the palette area for(int i = 0; i < 3; i++) pvi->TrueColorInfo.dwBitMasks[i] = bits555[i]; pvi->bmiHeader.biCompression = BI_BITFIELDS; pvi->bmiHeader.biBitCount = 16; break; } case 4: { // 8 bit palettised pvi->bmiHeader.biCompression = BI_RGB; pvi->bmiHeader.biBitCount = 8; pvi->bmiHeader.biClrUsed = iPALETTE_COLORS; break; } } // Adjust the parameters common to all formats pvi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); pvi->bmiHeader.biWidth = m_iImageWidth; pvi->bmiHeader.biHeight = m_iImageHeight; pvi->bmiHeader.biPlanes = 1; pvi->bmiHeader.biSizeImage = GetBitmapSize(&pvi->bmiHeader); pvi->bmiHeader.biClrImportant = 0; pvi->AvgTimePerFrame = 10000000 / 24; SetRectEmpty(&(pvi->rcSource)); // we want the whole image area rendered. SetRectEmpty(&(pvi->rcTarget)); // no particular destination rectangle pmt->SetType(&MEDIATYPE_Video); pmt->SetFormatType(&FORMAT_VideoInfo); pmt->SetTemporalCompression(FALSE); // Work out the GUID for the subtype from the header info. const GUID SubTypeGUID = GetBitmapSubtype(&pvi->bmiHeader); pmt->SetSubtype(&SubTypeGUID); pmt->SetSampleSize(pvi->bmiHeader.biSizeImage); return NOERROR; } // GetMediaType // // CheckMediaType // // We will accept 8, 16, 24 or 32 bit video formats, in any // image size that gives room to bounce. // Returns E_INVALIDARG if the mediatype is not acceptable // HRESULT CPushPinDesktop::CheckMediaType(const CMediaType *pMediaType) { CheckPointer(pMediaType,E_POINTER); if((*(pMediaType->Type()) != MEDIATYPE_Video) || // we only output video !(pMediaType->IsFixedSize())) // in fixed size samples { return E_INVALIDARG; } // Check for the subtypes we support const GUID *SubType = pMediaType->Subtype(); if (SubType == NULL) return E_INVALIDARG; if( (*SubType != MEDIASUBTYPE_RGB8) && (*SubType != MEDIASUBTYPE_RGB565) && (*SubType != MEDIASUBTYPE_RGB555) && (*SubType != MEDIASUBTYPE_RGB24) && (*SubType != MEDIASUBTYPE_RGB32)) { return E_INVALIDARG; } // Get the format area of the media type VIDEOINFO *pvi = (VIDEOINFO *) pMediaType->Format(); if(pvi == NULL) return E_INVALIDARG; // Check if the image width & height have changed if( pvi->bmiHeader.biWidth != m_iImageWidth || abs(pvi->bmiHeader.biHeight) != m_iImageHeight) { // If the image width/height is changed, fail CheckMediaType() to force // the renderer to resize the image. return E_INVALIDARG; } // Don't accept formats with negative height, which would cause the desktop // image to be displayed upside down. if (pvi->bmiHeader.biHeight < 0) return E_INVALIDARG; return S_OK; // This format is acceptable. } // CheckMediaType // // DecideBufferSize // // This will always be called after the format has been sucessfully // negotiated. So we have a look at m_mt to see what size image we agreed. // Then we can ask for buffers of the correct size to contain them. // HRESULT CPushPinDesktop::De