1.用c#调用摄像头做录像功能
2.PJSIP源码探究 pjmedia-videodev模块
3.flv.js源码知识点（下） FLV格式解析
4.求一个控制摄像头小程序的源码源码，要求VC下编译运行
用c#调用摄像头做录像功能
前段时间刚做了个监控系统，源码有不明白+qq
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
using System;
namespace CamTest2
{
/// <summary>
/// 一个控制摄像头的源码类
/// </summary>
public class Pick
{
private const int WM_USER = 0x;
private const int WS_CHILD = 0x;
private const int WS_VISIBLE = 0x;
private const int WM_CAP_START = WM_USER;
private const int WM_CAP_STOP = WM_CAP_START + ;
private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + ;
private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + ;
private const int WM_CAP_SAVEDIB = WM_CAP_START + ;
private const int WM_CAP_GRAB_FRAME = WM_CAP_START + ;
private const int WM_CAP_SEQUENCE = WM_CAP_START + ;
private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + ;
private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + ;
private const int WM_CAP_SET_OVERLAY = WM_CAP_START + ;
private const int WM_CAP_SET_PREVIEW = WM_CAP_START + ;
private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
private const int WM_CAP_SET_SCALE = WM_CAP_START + ;
private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + ;
private const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + ;
private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + ;
private const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + ;
private const int WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + ;
private IntPtr hWndC;
private bool bStat = false;
private IntPtr mControlPtr;
private int mWidth;
private int mHeight;
private int mLeft;
private int mTop;
/// <summary>
/// 初始化摄像头
/// </summary>
/// <param name="handle">控件的句柄</param>
/// <param name="left">开始显示的左边距</param>
/// <param name="top">开始显示的上边距</param>
/// <param name="width">要显示的宽度</param>
/// <param name="height">要显示的长度</param>
public Pick(IntPtr handle, int left, int top, int width, int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
mLeft = left;
mTop = top;
}
[DllImport("avicap.dll")]
private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
[DllImport("avicap.dll")]
private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
[DllImport("User.dll")]
private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);
public void capDlgVideoFormat()
{
Boolean capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0);
}
public void capDlgVideoSource()
{
Boolean capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);
}
public void capDlgVideoDisplay()
{
Boolean capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0);
}
public void capDlgVideoCompression()
{
Boolean capDlgVideoCompression = SendMessage(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0);
}
/// <summary>
/// 开始显示图像
/// </summary>
public void Start()
{
if (bStat)
return;
bStat = true;
byte[] lpszName = new byte[];
hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
if (hWndC.ToInt() != 0)
{
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, , 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
}
return;
}
/// <summary>
/// 停止显示
/// </summary>
public void Stop()
{
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
bStat = false;
}
/// <summary>
/// 抓图
/// </summary>
/// <param name="path">要保存bmp文件的路径</param>
public void GrabImage(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt());
}
/// <summary>
/// 录像
/// </summary>
/// <param name="path">要保存avi文件的路径</param>
public void Kinescope(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt());
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
}
/// <summary>
/// 停止录像
/// </summary>
public void StopKinescope()
{
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
}
/* public void cap()
{
CAPTUREPARMS s;
capCaptureGetSetup(m_caphwnd,&s,sizeof(CAPTUREPARMS));//取得采集参数
s.dwRequestMicroSecPerFrame = ;//采集一帧花费1/秒
s.fAbortLeftMouse = FALSE;//压下鼠标左键不终止采集
s.fAbortRightMouse = FALSE;//压下鼠标右键不终止采集
s.fCaptureAudio = TRUE;//c采集音频
s.fYield = TRUE;//使用一个独立的线程来采集视频，不使用View窗口线程
capCaptureSetSetup(m_caphwnd,源码&s,sizeof(CAPTUREPARMS));//设定采集参数
}*/
}
}
PJSIP源码探究 pjmedia-videodev模块
PJMEDIA-Videodev模块详解：在PJSIP中的视频捕获功能实现
PJSIP中，pjmedia-videodev模块扮演着关键角色，源码它负责视频捕获功能，源码售后记录源码让开发者能够在应用中集成自定义画面捕获设备。源码为了深入了解，源码首先需要理解pjsua2中的源码工作流程，包括Endpoint对象的源码使用和相关c++函数的调用，如pjsua_create、源码pjsua_start和pjsua_init等。源码
在pjsip的源码源码中，视频捕获设备的源码初始化过程始于pjsua_media_subsys_init，这个函数通过pjsua_media_config_default参数，源码初始化了媒体子系统，其中包括视频和音频子系统。网页源码资源其中，pjmedia_vid_subsys_init在pjmedia-videodev模块的pjmedia_vid.c中被调用，用于初始化视频捕获设备子系统。
在Android环境下，pjmedia_and_factory是关键，它会在编译时根据平台特性注册到视频子系统中。当需要视频捕获时，会通过这个工厂创建具体设备，dubbo面试源码如摄像头，并获取画面。pjmedia-videodev-factory在android_dev.c文件中实现，包含了设备查找、参数设置和流创建等功能，如and_factory_init、and_factory_create_stream等。
视频流的仿vue源码管理主要通过pjmedia_vid_dev_stream结构体和对应的stream_op函数，如and_stream_get_param、and_stream_set_cap等，它们控制摄像头的设置和画面捕获。在自定义捕获中，可以通过这些接口添加时间水印，创造出更为丰富的视频体验。
总之，pjmedia-videodev模块为PJSIP提供了灵活的精益源码视频捕获能力，开发者可以根据需求定制捕获设备和功能。理解并掌握这一模块的工作原理，将有助于在实际项目中实现个性化的视频通话体验。
flv.js源码知识点（下） FLV格式解析
在flv.js系列文章的最后篇章中，我们将深入探讨FLV格式解析。FLVDemuxer是flv.js中的关键组件，但理解它之前，必须先熟悉FLV文件的数据结构和JavaScript中处理二进制数据的方法。
FLV文件，Adobe的Flash Video格式，由固定的FLVHeader和可变的FLVBody构成。FLVHeader包括9字节的固定信息，如类型和大小，而FLVBody由多个Tag组成，每个Tag由Tag Header和Tag Data构成。理解这些结构对于解析至关重要。
要操作FLV数据，我们需要掌握如何使用JavaScript的ArrayBuffer和DataView。DataView类提供了读取不同字节类型的API，如getUint8和getUint，理解字节序（小字节序与大字节序）也很重要。此外，位操作技巧，如按位与、或、异或以及位移，能在处理多字节数据和特定位信息时派上用场。
总的来说，理解FLV格式的详细结构，熟练运用二进制数据读取技术，是解析flv.js源码的关键。接下来，就是根据FLV规范，逐个字段解析数据了。
求一个控制摄像头小程序的源码，要求VC下编译运行
VC-摄像头控制SDK源码
#include <windows.h>
#include <stdio.h>
#include <vfw.h>
#pragma comment(lib,"vfw.lib")
HWND ghWndCap ; //捕获窗的句柄
CAPDRIVERCAPS gCapDriverCaps ; //视频驱动器的能力
CAPSTATUS gCapStatus ; //捕获窗的状态
char szCaptureFile[] = "MYCAP.AVI";
char gachBuffer[];
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
LRESULT CALLBACK StatusCallbackProc(HWND hWnd,int nID,LPSTR lpStatusText)
{
if(!ghWndCap)return FALSE;//获得捕获窗的状态
capGetStatus(ghWndCap,&gCapStatus,sizeof(CAPSTATUS));//更新捕获窗的大小
SetWindowPos(ghWndCap,NULL,0,0,gCapStatus.uiImageWidth,gCapStatus.uiImageHeight,SWP_NOZORDER|SWP_NOMOVE);
if(nID==0){ //清除旧的状态信息
SetWindowText(ghWndCap,(LPSTR)"hello");
return (LRESULT)TRUE;
}//显示状态ID和状态文本
wsprintf(gachBuffer,"Status# %d: %s",nID,lpStatusText);
SetWindowText(ghWndCap,(LPSTR)gachBuffer);
return (LRESULT)TRUE;
}
LRESULT CALLBACK ErrorCallbackProc(HWND hWnd,int nErrID,LPSTR lpErrorText)
{
if(!ghWndCap)return FALSE;
if(nErrID==0)return TRUE;//清除旧的错误
wsprintf(gachBuffer,"Error# %d",nErrID);//显示错误标识和文本
MessageBox(hWnd, lpErrorText, gachBuffer,MB_OK | MB_ICONEXCLAMATION);
return (LRESULT) TRUE;
}
LRESULT CALLBACK FrameCallbackProc(HWND hWnd,LPVIDEOHDR lpVHdr)
{
FILE *fp;
fp=fopen("caram.dat","w");
if(!ghWndCap)return FALSE;//假设fp为一打开的.dat文件指针
fwrite(lpVHdr->lpData,1,lpVHdr->dwBufferLength,fp);
return (LRESULT)TRUE;
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
static TCHAR szAppName[]=TEXT("HelloWin");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style=CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hInstance=hInstance;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=szAppName;
if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("This program requires WindowsNT!"),szAppName,MB_ICONERROR);
return 0;
}
hwnd=CreateWindow(szAppName,TEXT("The Hello Program"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch(message)
{
case WM_CREATE:
{
ghWndCap=capCreateCaptureWindow((LPSTR)"Capture Window",WS_CHILD|WS_VISIBLE,0,0,,,(HWND)hwnd,(int)0);
capSetCallbackOnError(ghWndCap,(FARPROC)ErrorCallbackProc);
capSetCallbackOnStatus(ghWndCap,(FARPROC)StatusCallbackProc);
capSetCallbackOnFrame(ghWndCap,(FARPROC)FrameCallbackProc);
capDriverConnect(ghWndCap,0); // 将捕获窗同驱动器连接
//获得驱动器的能力,相关的信息放在结构变量gCapDriverCaps中
capDriverGetCaps(ghWndCap,&gCapDriverCaps,sizeof(CAPDRIVERCAPS));
capPreviewRate(ghWndCap, ); // 设置Preview模式的显示速率
capPreview(ghWndCap, TRUE); //启动Preview模式
if(gCapDriverCaps.fHasOverlay) //检查驱动器是否有叠加能力
capOverlay(ghWndCap,TRUE); //启动Overlay模式
if(gCapDriverCaps.fHasDlgVideoSource)capDlgVideoSource(ghWndCap); //Video source 对话框
if(gCapDriverCaps.fHasDlgVideoFormat)capDlgVideoFormat(ghWndCap); // Video format 对话框
if(gCapDriverCaps.fHasDlgVideoDisplay)capDlgVideoDisplay(ghWndCap); // Video display 对话框
capFileSetCaptureFile( ghWndCap, szCaptureFile); //指定捕获文件名
capFileAlloc(ghWndCap, (L * L * 5)); //为捕获文件分配存储空间
capCaptureSequence(ghWndCap); //开始捕获视频序列
capGrabFrame(ghWndCap); //捕获单帧图像
}
return 0;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
GetClientRect(hwnd,&rect);
DrawText(hdc,TEXT("Hello,Windows!"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
{
capSetCallbackOnStatus(ghWndCap,NULL);
capSetCallbackOnError(ghWndCap,NULL);
capSetCallbackOnFrame(ghWndCap,NULL);
capCaptureAbort(ghWndCap);//停止捕获
capDriverDisconnect(ghWndCap); //将捕获窗同驱动器断开
PostQuitMessage(0);
}
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}
