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影像��理�pȝ��开发告一�D�落�Q�舒口气

攑ֱ�阿狗 — Tue, 27 Mar 2012 11:23:00 GMT

�׃��q?周时间去完成DVR��目的视频媄像管理系�l�。目标容�?00T�Q�利用廉价PC实现集群存储�Q�由于存储的是单个的视频�D�|��件且对于文�g容灾斚w��没有�Ҏ��的要求，允许单点存储损坏�?br />�pȝ��部��v一个stoMaster服务器做控制服务�Q�提供媄像系�l�的��d��调度分配、系�l�模块监控管理、系�l�媄像查询服务；若干个stoNodeServer作�ؓ单点存储服务器，每个节点服务器下挂蝲10�?T普通硬盘，单节�Ҏ��?0T定w��Q�由于采用PC架构�Q�大大节省成本且�q�能保证一定IO�q�发能力�Q�保�?00T定w��需�?0台PC做支撑�?br />开发涉及技�? python + ffmpeg + flex + openscales + swMapServer + Vs2008 + Qt + postgis + psycopg2 + comtypes
Links: http://sw2us.com/sites/default/files/dvr.demo.v0.1.0_2012.3.27.zip
�q�好有了python�q�个好帮�?不然要干��M��Q�python�Ҏ��来讲不是��单的当胶水辅助了�Q�通信框架、UI、数据库都采用python�Q�只有那些个点上用了高效点的c++�Q�例如：ffmpeg解码、文件存储等�{?br />演示视频:

http://sw2us.com/sites/default/files/flvshow/dvr.demo.html

�pȝ��q�行demo:

攑ֱ�阿狗 2012-03-27 19:23 发表评论

读vnc代码

攑ֱ�阿狗 — Wed, 01 Mar 2006 17:00:00 GMT

vnc可是好东西，对linux的支持可是非�怹�优秀�Q�比起在windows上要表现的好的多
vnc采用c/s架构�Q�其通信机制没有多少的复杂，但是对编写windows版本服务端代码的开发者对windows api��N��的能力倒是有点佩服
其实现技术：
win-hook + event-simulate + gdi-bitmap-capture(delay send) + libjpeg + socket
研究完了其工作机制之后我也写了一个类vnc的服务器和客��L��E�序�Q�运行之后发现在频率很高的bitmap捕获到libjpeg的压�~�的�q�程很耗cpu资源�Q�还有就是虽焉��用jpeg压羃(如在做视频监控时采用的mjpeg讑֤�一�?�q�是于码��太大，跟vnc比较了以下好像还是有一点的差距�Q�毕竟不是当作一个正式的咚咚��d��的，�{�有旉��之后或者某人倡议之下�l�箋完善它吧�Q?img src ="http://m.shnenglu.com/socketref/aggbug/3624.html" width = "1" height = "1" />

攑ֱ�阿狗 2006-03-02 01:00 发表评论

如何使用libjpeg(rgb2jpeg)

攑ֱ�阿狗 — Wed, 01 Mar 2006 16:47:00 GMT

  1 #include <stdio.h>
  2
  3 #include "jpeglib.h"
  4
  5 void
  6 JpegInitDestination(j_compress_ptr cinfo)
  7 {
  8 }
  9
10 static boolean
11 JpegEmptyOutputBuffer(j_compress_ptr cinfo)
12 {
13     return TRUE;
14 }
15
16 static void
17 JpegTermDestination(j_compress_ptr cinfo)
18 {
19 //    jpegDstDataLen = jpegDstBufferLen - jpegDstManager.free_in_buffer;
20 }
21
22 /**
23     Raw Rgb Data converted to Jpeg data
24 */
25 bool JpegCompress(int w,int h,const char * rgb_data,int rgb_size,
26                   char * jpeg_data,int *jpeg_size){
27     struct jpeg_compress_struct cinfo;
28     struct jpeg_error_mgr jerr;
29     struct jpeg_destination_mgr jpegDstManager;
30     int ret;
31     unsigned char *srcBuf = new unsigned char[w * 3];
32     JSAMPROW rowPointer[1];
33     rowPointer[0] = (JSAMPROW)srcBuf;
34     int left_size;
35     left_size = *jpeg_size;
36     cinfo.err = jpeg_std_error(&jerr);
37     jpeg_create_compress(&cinfo);
38
39     cinfo.image_width = w;
40     cinfo.image_height = h;
41     cinfo.input_components = 3;
42     cinfo.in_color_space = JCS_RGB;
43     cinfo.raw_data_in = true;
44     jpeg_set_defaults(&cinfo);
45
46
47     cinfo.dest = &jpegDstManager;
48
49     jpegDstManager.next_output_byte = (unsigned char*)jpeg_data;
50     jpegDstManager.free_in_buffer = left_size;
51     jpegDstManager.init_destination = JpegInitDestination;
52     jpegDstManager.empty_output_buffer = JpegEmptyOutputBuffer;
53     jpegDstManager.term_destination = JpegTermDestination;
54
55     //jpeg_set_quality(&cinfo, 20, TRUE);
56
57     jpeg_start_compress(&cinfo, TRUE);
58     for(int y=0;y< h;y++){
59         rowPointer[0] = (unsigned char*)(rgb_data + y*w*3);
60         ret = jpeg_write_scanlines(&cinfo, rowPointer, 1);
61     }
62     jpeg_finish_compress(&cinfo);
63     jpeg_destroy_compress(&cinfo);
64     *jpeg_size = left_size - jpegDstManager.free_in_buffer;
65     return true;
66 }
67
68 void
69 JpegInitSource(j_decompress_ptr cinfo)
70 {
71
72 }
73
74 boolean
75 JpegFillInputBuffer(j_decompress_ptr cinfo)
76 {
77     /*
78     jpegError = true;
79     jpegSrcManager.bytes_in_buffer = jpegBufferLen;
80     jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;    */
81     return TRUE;
82 }
83
84 void
85 JpegSkipInputData(j_decompress_ptr cinfo, long num_bytes)
86 {/*
87     if (num_bytes < 0 || (size_t)num_bytes > jpegSrcManager.bytes_in_buffer) {
88         jpegError = true;
89         jpegSrcManager.bytes_in_buffer = jpegBufferLen;
90         jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;
91     } else {
92         jpegSrcManager.next_input_byte += (size_t) num_bytes;
93         jpegSrcManager.bytes_in_buffer -= (size_t) num_bytes;
94     }*/
95 }
96
97 void
98 JpegTermSource(j_decompress_ptr cinfo)
99 {
100     /* No work necessary here. */
101 }
102
103 bool JpegUnCompress(const char * jpeg_data,int jpeg_size,
104                     char *rgb_data,int rgb_size,int w,int h){
105     struct jpeg_decompress_struct cinfo;
106     struct jpeg_error_mgr jerr;
107     struct jpeg_source_mgr jpegSrcManager;
108     int ret;
109     JSAMPROW rowPointer[1];
110     cinfo.err = jpeg_std_error(&jerr);
111     jpeg_create_decompress(&cinfo);
112
113     jpegSrcManager.init_source = JpegInitSource;
114     jpegSrcManager.fill_input_buffer = JpegFillInputBuffer;
115     jpegSrcManager.skip_input_data = JpegSkipInputData;
116     jpegSrcManager.resync_to_restart = jpeg_resync_to_restart;
117     jpegSrcManager.term_source = JpegTermSource;
118     jpegSrcManager.next_input_byte = (unsigned char*)jpeg_data;
119     jpegSrcManager.bytes_in_buffer = jpeg_size;
120     cinfo.src = &jpegSrcManager;
121
122     jpeg_read_header(&cinfo, TRUE);
123     cinfo.out_color_space = JCS_RGB;
124     jpeg_start_decompress(&cinfo);
125     if( cinfo.output_width != (unsigned int)w && cinfo.output_height != (unsigned int)h){
126         jpeg_destroy_decompress(&cinfo);
127         return false;
128     }
129     for (int dy = 0; cinfo.output_scanline < cinfo.output_height; dy++) {
130         rowPointer[0] = (unsigned char *)(rgb_data + w*dy*3);
131         ret = jpeg_read_scanlines(&cinfo, rowPointer, 1);
132     }
133     jpeg_finish_decompress(&cinfo);
134     jpeg_destroy_decompress(&cinfo);
135     return true;
136 }
137

攑ֱ�阿狗 2006-03-02 00:47 发表评论

攑ֱ�阿狗 — Wed, 01 Mar 2006 16:42:00 GMT

摘要: 1 // VideoDrawer.h: interface for the CVideoDrawer class. 2 // 3 //////////////////////////////////////////////////////////////////////&nbs... 阅读全文

攑ֱ�阿狗 2006-03-02 00:42 发表评论

pc camera视频捕捉

攑ֱ�阿狗 — Wed, 01 Mar 2006 16:36:00 GMT

利用windows capture Api捕获的视频流是RGB数据

1
2 /*
3
4     capture.h
5     caputre用户捕获pc camera�?nbsp;RGB视频�?BR> 6     做到capture,encoder,mgr 独立�Q�不会有依赖性，以便之后的复�?BR> 7 */
8
9 #ifndef _DESKCAM_CAPTURE_H
10 #define _DESKCAM_CAPTURE_H
11
12
13 #include <windows.h>
14 #include "vfw.h"
15 #pragma comment(lib, "winmm.lib")
16 #pragma comment(lib, "vfw32.lib")
17 #include <nv.h>
18
19
20 struct CaptureInfo{
21     NVString        sid;
22     unsigned int    index;    //
23     unsigned int    type;    //�c�d��
24     unsigned short    width;
25     unsigned short  height;
26     void (*after_capture)(void * data,unsigned int size,void * user);
27     void * user;
28 };
29
30 class  PCDeskCamera:public NVObject{
31 public:
32     PCDeskCamera(){ _bmpInfo = NULL;}
33     ~PCDeskCamera(){    if(_bmpInfo)    {delete _bmpInfo;_bmpInfo=NULL;} }
34
35     bool                Open();
36     void                Close();
37     CaptureInfo&        GetCaptureInfo(){    return _ctx;}
38 private:
39     static LRESULT    CALLBACK    StreamCapture(HWND hwnd,LPVIDEOHDR hdr);
40     bool                GetBitmapInfo(HWND cap);
41     HWND                _hwnd;
42     CaptureInfo            _ctx;
43     HWND                _capture_wnd;
44     LPBITMAPINFO        _bmpInfo;
45 };
46 #endif
47

1
2 #include "capture.h"
3
4 /*
5 视频捕获�Q�必��L��供消息处理机�?
6 while(GetMessage()){
7     TranslateMessage();
8     DispatchMessage();
9 }
10 而且回调函数必须声明�?nbsp;static LRESULT    CALLBACK,否则产生异常
11 */
12
13 LRESULT PCDeskCamera::StreamCapture(HWND hwnd,LPVIDEOHDR hdr){
14     PCDeskCamera * cam;
15     //int i;
16     //i=100;
17 //    MessageBeep(100);
18 //    return 0;
19
20     cam = (PCDeskCamera*)GetWindowLong(hwnd,GWL_USERDATA);
21     if( cam== NULL){
22         return 0;
23     }
24     //--
25     cam->GetCaptureInfo().after_capture(hdr->lpData,hdr->dwBytesUsed,
26         cam->GetCaptureInfo().user);
27     return 1;
28 }
29
30
31 bool PCDeskCamera::GetBitmapInfo(HWND cap){
32     int vfs=capGetVideoFormatSize(cap);
33     if(!vfs)        return false;
34     if(_bmpInfo)    {delete _bmpInfo;_bmpInfo=NULL;}
35     _bmpInfo =(BITMAPINFO*)( new char[vfs]);
36     LPBITMAPINFOHEADER bmpIH=( LPBITMAPINFOHEADER )_bmpInfo;
37     bmpIH->biSize= sizeof(BITMAPINFOHEADER);
38     BOOL ret=capGetVideoFormat(cap, _bmpInfo, (WORD)vfs);
39     _ctx.width = bmpIH->biWidth;
40     _ctx.height = bmpIH->biHeight;
41     return true;
42 }
43
44 bool PCDeskCamera::Open(){
45     int ret;
46     CAPTUREPARMS cpp;
47     _capture_wnd = capCreateCaptureWindow("AviCap_Basic1", WS_CHILD|WS_VISIBLE,
48         0, 0, 200,200,
49         GetDesktopWindow(),
50         0xff00);
51     if(_capture_wnd == NULL){
52         return false;
53     }
54     SetWindowLong(_capture_wnd,GWL_USERDATA,(LONG)this);
55     capPreviewRate(_capture_wnd,50);
56     ret =capDriverConnect(_capture_wnd, _ctx.index);
57     if( ret == FALSE){
58         return false;
59     }
60
61     if(!GetBitmapInfo(_capture_wnd))    {
62         return false;
63     }
64     ret = capSetCallbackOnVideoStream(_capture_wnd,PCDeskCamera::StreamCapture);
65     capCaptureGetSetup(_capture_wnd, &cpp, sizeof(CAPTUREPARMS));
66        cpp.fYield = true ;
67     cpp.fAbortLeftMouse = false;
68     cpp.fAbortRightMouse = false;
69     cpp.fCaptureAudio = false;
70     ret = capCaptureSetSetup (_capture_wnd, &cpp, sizeof(CAPTUREPARMS));
71     capCaptureSequenceNoFile(_capture_wnd);
72     //capCaptureSequence(_capture_wnd);
73     ShowWindow(_capture_wnd,SW_HIDE);
74
75
76     return true;
77 }
78
79 void PCDeskCamera::Close(){
80 //    capCaptureAbort(_capture_wnd);
81     capSetCallbackOnVideoStream(0 ,NULL);
82     capDriverDisconnect(_capture_wnd);
83     capCaptureStop(_capture_wnd);
84     SetWindowLong(_capture_wnd,GWL_USERDATA,(LONG)NULL);
85     ::CloseWindow(_capture_wnd);
86     DestroyWindow(_capture_wnd);
87 }
88
89
90

攑ֱ�阿狗 2006-03-02 00:36 发表评论

攑ֱ�阿狗 — Wed, 01 Mar 2006 16:33:00 GMT

摘要: 1 #include 2 3 long int crv_tab[256]; 4 long int cbu_tab[256]; 5 lo... 阅读全文

攑ֱ�阿狗 2006-03-02 00:33 发表评论

攑ֱ�阿狗 — Wed, 01 Mar 2006 16:28:00 GMT

摘要: �׃��视频开发的需求，��装xvid c调用接口�Q��之优雅易用我已经对pc camera视频��?RGB)�q�行��试�Q�编码之后传输到�q�程��L��q�行解码回放�Q�效果不错具体的xvid的参数可以进一步优化，�q�里只是提供��单的范例1. xvid 解码 1 2 /* 3 encode.cpp 4... 阅读全文

攑ֱ�阿狗 2006-03-02 00:28 发表评论

tinyRpc ��Z��tcp/xml的rpc服务�?[dev...]

攑ֱ�阿狗 — Sun, 01 Jan 2006 16:52:00 GMT

      参阅 www.xmlrpc.org 的xmlrpc规范�Q�发现其规格比较��单，�|�站list top50中xmlrpc的不同语�a�的实玎ͼ�研究了xmlrpc-c,sexyRcp,phpRpc�{�代码，发现光��实现比较复杂�Q�有些只是提供了xmlrpc的语�a�规格实现�Q�但没有实现�|�络传输的功能�?BR>      �׃��xmlrpc规范的网�l�传输采用http�Q�一个请求必��d��Z��ơtcp的交互，��D��性能上得不到提高�Q�而且只是单向调用�{�限�Ӟ��我考虑重新�~�写xmlrpc的实玎ͼ�提供xmlrpc-server,��化其操作接口,支持在客��h��和服务器之间保持一个tcp�q�接�Q�持�l�的�q�行xmlrpc双向调用.
      支持语言:      C++ / Python
      计划旉��:   2005.12.31    ~ 2006.1.3

2006.1.4    完成rpcServer c++版本

攑ֱ�阿狗 2006-01-02 00:52 发表评论

短小的日志类

攑ֱ�阿狗 — Sun, 11 Dec 2005 12:31:00 GMT

摘要: 本�h一直��用的日志�c�，支持3�U�输出方�?windows�H�体�Q�udp�Q�常规文�?,�q�格式化输出�Q? 1 2/**//* 3 nvlog.h 4 ---------------- 5 &nb... 阅读全文

攑ֱ�阿狗 2005-12-11 20:31 发表评论

��?.1版本�q�有一点点

攑ֱ�阿狗 — Sun, 11 Dec 2005 12:20:00 GMT

      �pȝ��在闲暇之余慢慢进行，没有写�Q何设计文档，所有的设计都在脑子里面�Q�对于结构非常清晎ͼ�没有合适的合作伙伴�Q�只能慢慢做
      fas,eserver,febean,code_bean,mplayer基本完成�q�进行了��单测试，css完成大部分编码，与alice的rpc完成通信�Q�已�l�能够通过http讉K��基本的系�l�功能，通过操作��览器可以访问前端媒体设备。前端设备只是接入了一个deskCam,用xvid�~�解码，不过没有关系
      今天写到了css与alice的xmlrpc通信部分�Q�对于资料查询，录像启动�Q�停止等操作卛_��加入
可是接下来公司要�z�N��出差�Q�可能又要耽误�?IMG height=20 src="http://m.shnenglu.com/Emoticons/hitwall.gif" width=25 border=0>

�q�期计划:
2005.12.12~2005.12.30:
  1.完成css录像和存储的剩余�~�码和调�?提供web接口启动录像,查询录像资料和录像的回放
  2.修改mplayer控�g,增加本地录像,抓拍,回放工功�?�q�进一步调试稳�?BR>  3.提供��单的web�pȝ��,可以�q�行��览,控制,回放(不提供其他管�?诸如用户,讑֤��理)
  2006.01.01~2006.01.30
  1.整体联测完成
  2.增加接入另外一�ƾ设�?比如acti或者smartsight
  3.所有系�l�模块入cvs
4.推出0.1版本

攑ֱ�阿狗 2005-12-11 20:20 发表评论