www.gusucode.com > 一个可以在局域网进行视频聊天的源代码 > 一个可以在局域网进行视频聊天的源代码/VoIP/VideoCapture.cpp
////////////////////////////////////////////////////////////////////////////
//
//
// Project : VideoNet version 1.1.
// Description : Peer to Peer Video Conferencing over the LAN.
// Author : Nagareshwar Y Talekar ( nsry2002@yahoo.co.in)
// Date : 15-6-2004.
//
//
// File description :
// Name : VideoCapture.cpp
// Details : Captures the frames from webcam.
//
//
/////////////////////////////////////////////////////////////////////////////
#include "Stdafx.h"
#include "VideoCapture.h"
#include <afxmt.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#pragma comment(lib,"vfw32")
#pragma comment(lib,"winmm")
// Global varialbes...
int count=0;
unsigned char cdata[10000];
int cbuffer_size=10000;
unsigned char rgbdata[80000];
int buffersize=80000;
// Callback function gets invoked during compression...
// It returns the compressed data byte by byte...
void OwnWriteFunction(int byte)
{
if(count<cbuffer_size)
cdata[count]=(unsigned char)byte;
count++;
}
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
VideoCapture::VideoCapture()
{
m_capwnd = NULL;
isOver = FALSE;
m_OnCaptureVideo = NULL;
log.Open("videocapture.log",CFile::modeCreate | CFile::modeWrite);
}
VideoCapture::~VideoCapture()
{
}
BOOL VideoCapture::Initialize()
{
char devname[100],devversion[100];
char str[200];
int index=0;
// 初始化压缩编码器
InitCompressor();
// 创建摄像头句柄
m_capwnd = capCreateCaptureWindow("Capture",WS_POPUP,0,0,1,1,0,0);
if(m_capwnd==NULL)
{
log.WriteString("\n Unable to create capture window");
return FALSE;
}
// 连接摄像头设备
capSetUserData( m_capwnd, this );
// 显示视频设置对话框，进行配置视频的大小、颜色位数等。
capDlgVideoFormat( m_capwnd );
// 取得视频图像数据头，后面压缩时需要用到
capGetVideoFormat( m_capwnd, &m_bmpinfo, sizeof(BITMAPINFO) );
// 设置回调函数
capSetCallbackOnVideoStream( m_capwnd, OnCaptureVideo );
capGetDriverDescription(index,devname,100,devversion,100);
sprintf(str,"\n Driver name = %s version = %s ",devname,devversion);
log.WriteString(str);
// Connect to webcam driver
if( ! capDriverConnect(m_capwnd,index) )
{
// Device may be open already or it may not have been
// closed properly last time.
AfxMessageBox("Unable to open Video Capture Device");
log.WriteString("\n Unable to connect driver to the window");
m_capwnd=NULL;
return FALSE;
}
// Set the capture parameters
if(SetCapturePara()==FALSE)
{
log.WriteString("\n Setting capture parameters failed");
capDriverDisconnect(m_capwnd);
return FALSE;
}
return TRUE;
}
/**
* Start capturing frames from webcam
*
*/
BOOL VideoCapture::StartCapture(HDC BackDC)
{
m_LocalScreenDC = BackDC;
// 初始化视频回放对象
m_hdib = ::DrawDibOpen();
if( m_hdib != NULL )
{
::DrawDibBegin(
m_hdib,
m_LocalScreenDC,
-1, // don't stretch
-1, // don't stretch
&m_bmpinfo.bmiHeader,
IMAGE_WIDTH, // width of image
IMAGE_HEIGHT, // height of image
0
);
}
// 开始视频采集
if(capCaptureSequenceNoFile(m_capwnd)==FALSE)
{
log.WriteString("\n Failed to capture Sequence ..");
return FALSE;
}
return TRUE;
}
/**
* Stop the capturing process
*
*/
BOOL VideoCapture::StopCapture()
{
capCaptureStop(m_capwnd);
capCaptureAbort(m_capwnd);
Sleep(500);
return TRUE;
}
/**
* Stop the catpure process and disconnect the driver
*
*/
void VideoCapture::Destroy()
{
if(m_capwnd==NULL) return;
// Stop the capturing process
capCaptureAbort(m_capwnd);
// Disable the callback function..
capSetCallbackOnVideoStream(m_capwnd, NULL);
Sleep(300); // This delay is important...
// Finally disconnect the driver
capDriverDisconnect(m_capwnd);
}
/**
*
* Set various capture parameters...
*
*/
BOOL VideoCapture::SetCapturePara()
{
CAPTUREPARMS CapParms={0};
capCaptureGetSetup(m_capwnd,&CapParms,sizeof(CapParms));
CapParms.fAbortLeftMouse = FALSE;
CapParms.fAbortRightMouse = FALSE;
CapParms.fYield = TRUE;
CapParms.fCaptureAudio = FALSE;
CapParms.wPercentDropForError = 50;
CapParms.dwRequestMicroSecPerFrame = (DWORD) ( 1.0e6 / 15.0 );
if(capCaptureSetSetup(m_capwnd,&CapParms,sizeof(CapParms))==FALSE)
{
log.WriteString("\n Failed to set the capture parameters ");
return FALSE;
}
// Set Video Format
capGetVideoFormat(m_capwnd,&m_bmpinfo,sizeof(m_bmpinfo));
m_bmpinfo.bmiHeader.biWidth=IMAGE_WIDTH;
m_bmpinfo.bmiHeader.biHeight=IMAGE_HEIGHT;
BOOL ret=capSetVideoFormat(m_capwnd,&m_bmpinfo,sizeof(m_bmpinfo));
if(ret==TRUE)
log.WriteString("\n Video parameters set properly");
return TRUE;
}
/**
*
* Allocate Memory for DIB image buffer
*
*/
int VideoCapture::AllocateMemory(PBITMAPINFO &bmpinfo)
{
int size1,size2,size;
BITMAPINFO tbmp;
char str[200];
capGetVideoFormat(m_capwnd,&tbmp,sizeof(tbmp));
size1 = getFormatSize ( tbmp );
size2 = getImageSize ( tbmp );
size = size1 + size2;
sprintf(str,"\n Formatsize = %d imagesize = %d , fun_size = %d ",
size1,size2, capGetVideoFormatSize(m_capwnd));
log.WriteString(str);
bmpinfo=(BITMAPINFO *) new BYTE[size];
if(bmpinfo==NULL)
{
AfxMessageBox("Unable to allocate memory");
return -1;
}
memset(bmpinfo,0,sizeof(*bmpinfo));
capGetVideoFormat(m_capwnd,bmpinfo,sizeof(*bmpinfo));
return size1;
}
/**
*
* Calculates the Format Size for DIB image
*
*/
int VideoCapture::getFormatSize(BITMAPINFO bmp)
{
int size;
size=(bmp.bmiHeader.biSize!=0)?bmp.bmiHeader.biSize :sizeof(BITMAPINFOHEADER);
//return (size+ bmp.bmiHeader.biClrUsed *sizeof(RGBQUAD));
return size; //RGBQUAD is absent for 24 bit bmp image.
}
/**
* Calculates the Size of Image
*
*/
int VideoCapture::getImageSize(BITMAPINFO bmp)
{
int size;
BITMAPINFOHEADER head=bmp.bmiHeader;
if( head.biSizeImage==0 )
{
size=( head.biWidth * head.biHeight * head.biBitCount)/8;
}
else
size = head.biSizeImage;
return size;
}
//////////////////////////////////////////////////////////////////////////
//
// 设置采集数据回调接口
//
void VideoCapture::SetOnCaptureVideoCallback(CALLBACKFUNC OnCaptureVideo, void* pParam)
{
m_OnCaptureVideo = OnCaptureVideo;
m_pParam = pParam;
}
/**
* Invoked when the video frame is captured by the driver
*
*
*/
LRESULT CALLBACK OnCaptureVideo(HWND mwnd,LPVIDEOHDR lphdr)
{
VideoCapture *vidcap=(VideoCapture *)capGetUserData(mwnd);
if( vidcap!=NULL )
{
vidcap->DrawLocalScreen( lphdr );
vidcap->CompressFrame( lphdr );
// if ( vidcap->m_OnCaptureVideo != NULL )
// {
// (*vidcap->m_OnCaptureVideo)( mwnd, lphdr );
// vidcap->DrawLocalScreen( lphdr );
// vidcap->CompressFrame( lphdr );
// }
}
return TRUE;
}
void VideoCapture::CompressFrame(LPVIDEOHDR lphdr)
{
// BOOL bKeyFrame;
// DWORD OutActSize;
// BYTE* Buf;
//
// OutActSize = m_bmpinfo.bmiHeader.biSizeImage;
// bKeyFrame = 0;
//
// Buf = (BYTE*)ICSeqCompressFrame( &m_CV,0,lphdr->lpData,&bKeyFrame,(long*)&OutActSize);
Bits bits; // Various count about compression
//Convert the data from rgb format to YUV format
ConvertRGB2YUV( IMAGE_WIDTH,IMAGE_HEIGHT, lphdr->lpData, yuv );
// Reset the counter
count=0;
// 压缩数据
cparams.format=CPARAM_QCIF;
cparams.inter = CPARAM_INTRA;
cparams.Q_intra = 8;
cparams.data=yuv; // Data in YUV format...
::CompressFrame(&cparams, &bits);
// 传送数据
m_pCommClient->SendPacket( (char*)cdata, count, PACKET_VIDEO );
}
void VideoCapture::InitCompressor()
{
// memset( &m_CV,0,sizeof(COMPVARS) );
// m_CV.cbSize = sizeof( m_CV );
// ICCompressorChoose( m_capwnd, 0, NULL, NULL, &m_CV, "Choose a Compressor" );
// Initialize table for RGB to YUV conversion
InitLookupTable();
// Initialize the compressor
cparams.format = CPARAM_QCIF;
InitH263Encoder(&cparams);
// Set up the callback function
WriteByteFunction = OwnWriteFunction;
// Initialize decompressor
InitH263Decoder();
return;
}
//////////////////////////////////////////////////////////////////////////
//
// 回放本地视频
//
void VideoCapture::DrawLocalScreen(LPVIDEOHDR lphdr)
{
::DrawDibDraw(
m_hdib,
m_LocalScreenDC,
0, // dest : left pos
0, // dest : top pos
-1, // don't zoom x
-1, // don't zoom y
&m_bmpinfo.bmiHeader, // bmp header info
lphdr->lpData, // bmp data
0, // src :left
0, // src :top
IMAGE_WIDTH, // src : width
IMAGE_HEIGHT, // src : height
DDF_SAME_DRAW // use prev params....
);
}
//////////////////////////////////////////////////////////////////////////
//
// 设置通信接口
//
void VideoCapture::SetCommClient(CCommClient *pClient)
{
m_pCommClient = pClient;
}
//////////////////////////////////////////////////////////////////////////
//
// 回放远程视频
//
void VideoCapture::DrawRemoteScreen(char *data, UINT size, HDC hScreenDC)
{
int iErrorCode;
int iDataSize;
u_char* upData;
iDataSize = size;
upData = (u_char*)data;
iErrorCode = DecompressFrame( upData, iDataSize, rgbdata, buffersize );
if ( iErrorCode == 0 ) return;
::DrawDibDraw(
m_hdib,
hScreenDC,
0, // dest : left pos
0, // dest : top pos
-1, // don't zoom x
-1, // don't zoom y
&m_bmpinfo.bmiHeader, // bmp header info
rgbdata, // bmp data
0, // src :left
0, // src :top
IMAGE_WIDTH, // src : width
IMAGE_HEIGHT, // src : height
DDF_SAME_DRAW // use prev params....
);
}