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C Source format, 3 years 1 month old, and 267 hits.

Paste Description for scale webcam linux

use for scaling webcam video on a linux machine (something I c.ouldn't find an app for)

scale webcam linux
Sunday, January 21st, 2007 at 7:12:41pm MST 

  1. /*
  2. * cam_hacks.c
  3. * does strange things to a video feed
  4. * GPL - based on Jaromil's hasciicam
  5. * Thank you Rasta Coder! You are the man!
  6. */
  7.  
  8.  
  9.  
  10. /*
  11.     NOTE
  12.     I removed the YtoRGB thinghhy because it was causing
  13.     some black pixels to become white. It was annoying!
  14.    
  15.     TODO
  16.     fix beating
  17.     fix 16-bit
  18. */
  19.  
  20. #include <math.h>
  21. #include <stdio.h>
  22. #include <stdlib.h>
  23. #include <string.h>
  24. #include <unistd.h>
  25. #include <getopt.h>
  26. #include <errno.h>
  27. #include <fcntl.h>
  28. #include <ctype.h>
  29. #include <sys/time.h>
  30. #include <sys/mman.h>
  31. #include <sys/ioctl.h>
  32. #include <sys/types.h>
  33. #include <sys/stat.h>
  34. #include <pwd.h>
  35. #include <signal.h>
  36.    
  37. #include <SDL/SDL.h>
  38.    
  39. #include <linux/soundcard.h>
  40. #include <linux/types.h>
  41. #include <linux/videodev.h>
  42.  
  43.    
  44.    
  45. #define IMAGE_WIDTH  300 //the clip is divided up into this number of segments
  46. #define IMAGE_HEIGHT 200 //this is the number of frequencies...
  47.    
  48. #define SCALE 4
  49.  
  50. #define SCREEN_WIDTH IMAGE_WIDTH*SCALE
  51. #define SCREEN_HEIGHT IMAGE_HEIGHT*SCALE
  52.    
  53.  
  54. char device[256];
  55.  
  56. int quiet = 0;
  57. int mode = 0;
  58. int useftp = 0;
  59. int input = 1;
  60. int daemon_mode = 0;
  61.  
  62. int TOGGLE_invert = 0;
  63. int TOGGLE_threshold = 0;
  64. unsigned char threshold_value = 128;
  65.  
  66. struct geometry {
  67.   int w, h, size;
  68.   int bright, contrast, gamma; };
  69.   struct geometry vid_geo;
  70.   /* if width&height have been manually changed */
  71.   int whchanged = 0;
  72.  
  73.   char device[256];
  74.   int have_tuner = 0;
  75.  
  76. /* v4l */
  77. unsigned char *grab_data;
  78. struct video_capability grab_cap;
  79. struct video_mbuf grab_map;
  80. struct video_mmap grab_buf[32];
  81. struct video_channel grab_chan;
  82. struct video_picture grab_pic;
  83. struct video_tuner grab_tuner;
  84. int minw, minh, maxw, maxh;
  85.  
  86. int dev = -1;
  87. int cur_frame, ok_frame;
  88. int palette;
  89.  
  90. /* rgb image is sampled */
  91. unsigned char *rgb_surface;
  92.  
  93.  
  94. void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
  95. {
  96.   Uint8 *ubuff8;
  97.   Uint16 *ubuff16;
  98.   Uint32 *ubuff32;
  99.   Uint32 color;
  100.   char c1, c2, c3;
  101.  
  102.   /* Lock the screen, if needed */
  103.   if(SDL_MUSTLOCK(screen)) {
  104.     if(SDL_LockSurface(screen) < 0)
  105.       return;
  106.   }
  107.  
  108.   /* Get the color */
  109.   color = SDL_MapRGB( screen->format, r, g, b );
  110.  
  111.   /* How we draw the pixel depends on the bitdepth */
  112.   switch(screen->format->BytesPerPixel)
  113.   {
  114.     case 1:
  115.       ubuff8 = (Uint8*) screen->pixels;
  116.       ubuff8 += (y * screen->pitch) + x;
  117.       *ubuff8 = (Uint8) color;
  118.       break;
  119.  
  120.     case 2:
  121.       ubuff8 = (Uint8*) screen->pixels;
  122.       ubuff8 += (y * screen->pitch) + (x*2);
  123.       ubuff16 = (Uint16*) ubuff8;
  124.       *ubuff16 = (Uint16) color;
  125.       break; 
  126.  
  127.     case 3:
  128.       ubuff8 = (Uint8*) screen->pixels;
  129.       ubuff8 += (y * screen->pitch) + (x*3);
  130.      
  131.  
  132.       if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
  133.         c1 = (color & 0xFF0000) >> 16;
  134.         c2 = (color & 0x00FF00) >> 8;
  135.         c3 = (color & 0x0000FF);
  136.       } else {
  137.         c3 = (color & 0xFF0000) >> 16;
  138.         c2 = (color & 0x00FF00) >> 8;
  139.         c1 = (color & 0x0000FF);       
  140.       }
  141.  
  142.       ubuff8[0] = c3;
  143.       ubuff8[1] = c2;
  144.       ubuff8[2] = c1;
  145.       break;
  146.      
  147.     case 4:
  148.       ubuff8 = (Uint8*) screen->pixels;
  149.       ubuff8 += (y*screen->pitch) + (x*4);
  150.       ubuff32 = (Uint32*)ubuff8;
  151.       *ubuff32 = color;
  152.       break;
  153.      
  154.     default:
  155.       fprintf(stderr, "Error: Unknown bitdepth!\n");
  156.   }
  157.  
  158.   /* Unlock the screen if needed */
  159.   if(SDL_MUSTLOCK(screen)) {
  160.     SDL_UnlockSurface(screen);
  161.   }
  162. }
  163.  
  164.  
  165. int vid_detect(char *devfile) {
  166.   int counter, res;
  167.   char *capabilities[] = {
  168.     "VID_TYPE_CAPTURE          can capture to memory",
  169.     "VID_TYPE_TUNER            has a tuner of some form",
  170.     "VID_TYPE_TELETEXT         has teletext capability",
  171.     "VID_TYPE_OVERLAY          can overlay its image to video",
  172.     "VID_TYPE_CHROMAKEY        overlay is chromakeyed",
  173.     "VID_TYPE_CLIPPING         overlay clipping supported",
  174.     "VID_TYPE_FRAMERAM         overlay overwrites video memory",
  175.     "VID_TYPE_SCALES           supports image scaling",
  176.     "VID_TYPE_MONOCHROME       image capture is grey scale only",
  177.     "VID_TYPE_SUBCAPTURE       capture can be of only part of the image"
  178.   };
  179.  
  180.   if (-1 == (dev = open(devfile,O_RDWR|O_NONBLOCK))) {
  181.     perror("!! error in opening video capture device: ");
  182.     return -1;
  183.   } else {
  184.     close(dev);
  185.     dev = open(devfile,O_RDWR);
  186.   }
  187.  
  188.   res = ioctl(dev,VIDIOCGCAP,&grab_cap);
  189.   if(res<0) {
  190.     perror("E' QUESTOOO!!!!!! error in VIDIOCGCAP: ");
  191.     return -1;
  192.   }
  193.  
  194.   fprintf(stderr,"Device detected is %s\n",devfile);
  195.   fprintf(stderr,"%s\n",grab_cap.name);
  196.   fprintf(stderr,"%u channels detected\n",grab_cap.channels);
  197.   fprintf(stderr,"max size w[%u] h[%u] - min size w[%u] h[%u]\n",grab_cap.maxwidth,grab_cap.maxheight,grab_cap.minwidth,grab_cap.minheight);
  198.   fprintf(stderr,"Video capabilities:\n");
  199.   for (counter=0;counter<11;counter++)
  200.     if (grab_cap.type & (1 << counter)) fprintf(stderr,"%s\n",capabilities[counter]);
  201.  
  202.   if (-1 == ioctl(dev, VIDIOCGPICT, &grab_pic)) {
  203.     perror("!! ioctl VIDIOCGPICT: ");
  204.     exit(1);
  205.   }
  206.  
  207.   if (grab_pic.palette & VIDEO_PALETTE_RGB32)
  208.     fprintf(stderr,"VIDEO_PALETTE_GREY        device is able to grab 32-bit RGB\n");
  209.  
  210.  
  211.   if(grab_cap.type & VID_TYPE_TUNER)
  212.     /* if the device does'nt has any tuner, so we avoid some ioctl
  213.     this should be a fix for many webcams, thanks to Ben Wilson */
  214.     have_tuner = 1;
  215.  
  216.  
  217.   /* set and check the minwidth and minheight */
  218.   minw = grab_cap.minwidth;
  219.   minh = grab_cap.minheight;
  220.   maxw = grab_cap.maxwidth;
  221.   maxh = grab_cap.maxheight;
  222.  
  223.  
  224.   if (ioctl (dev, VIDIOCGMBUF, &grab_map) == -1) {
  225.     perror("!! error in ioctl VIDIOCGMBUF: ");
  226.     return -1;
  227.   }
  228.   /* print memory info */
  229.   fprintf(stderr,"memory map of %i frames: %i bytes\n",grab_map.frames,grab_map.size);
  230.   for(counter=0;counter<grab_map.frames;counter++)
  231.     fprintf(stderr,"Offset of frame %i: %i\n",counter,grab_map.offsets[counter]);
  232.   return dev;
  233. }
  234.  
  235.  
  236. int vid_init() {
  237.  
  238.   int linespace = 5;
  239.   int i;
  240.  
  241.   /* set image source and TV norm */
  242.   grab_chan.channel = input = (grab_cap.channels>1) ? 1 : 0;
  243.  
  244.  
  245.   if(have_tuner) { /* does this only if the device has a tuner */
  246.     //   _band = 5; /* default band is europe west */
  247.     //   _freq = 0;
  248.     /* resets CHAN */
  249.     if (-1 == ioctl(dev,VIDIOCGCHAN,&grab_chan))
  250.       fprintf(stderr,"!! error in ioctl VIDIOCGCHAN: %s",strerror(errno));
  251.  
  252.     if (-1 == ioctl(dev,VIDIOCSCHAN,&grab_chan))
  253.       fprintf(stderr,"error in ioctl VIDIOCSCHAN: %s",strerror(errno));
  254.    
  255.     /* get/set TUNER settings */
  256.     if (-1 == ioctl(dev,VIDIOCGTUNER,&grab_tuner))
  257.       fprintf(stderr,"error in ioctl VIDIOCGTUNER: %s",strerror(errno));
  258.   }
  259.  
  260.   /* init video size from ascii size
  261.   1 ascii pixel = 4 video pixel
  262.   so video h&w are each double than ascii */
  263.   vid_geo.h = IMAGE_HEIGHT;
  264.   vid_geo.w = IMAGE_WIDTH;
  265.   vid_geo.size = vid_geo.w*vid_geo.h;
  266.   palette =VIDEO_PALETTE_RGB24;
  267.  
  268.   rgb_surface = (unsigned char *) malloc (vid_geo.size*3); //we need space for all three channels (3*8 = 24bit)
  269.  
  270.  
  271.   //#############CONTROLL PALETTE##################
  272.   /*VIDEO_PALETTE_RGB24;/*VIDEO_PALETTE_YUV420P;VIDEO_PALETTE_RGB32;/V4L2_PIX_FMT_SBGGR8;V4L2_PIX_FMT_SN9C10X; VIDEO_PALETTE_YUV422;*/
  273.   for(i=0; i<grab_map.frames; i++) {
  274.     grab_buf[i].format = palette; //RGB24;
  275.     grab_buf[i].frame  = i;
  276.     grab_buf[i].height = vid_geo.h;
  277.     grab_buf[i].width = vid_geo.w;
  278.   }
  279.  
  280.  
  281.   if (-1 == ioctl(dev,VIDIOCMCAPTURE,&grab_buf[0])) {
  282.    
  283.     /*palette=VIDEO_PALETTE_YUV420P;
  284.     for(i=0; i<grab_map.frames; i++) {
  285.       grab_buf[i].format = palette; //RGB24;
  286.     }
  287.     if (-1 == ioctl(dev,VIDIOCMCAPTURE,&grab_buf[0])) {
  288.       fprintf(stderr,"error in ioctl VIDIOCMCAPTURE: %s",strerror(errno));
  289.     }*/
  290.     fprintf(stderr,"error: VIDEO_PALETTE_RGB24 doesn't seem to work");
  291.   }
  292.  
  293.  
  294.   grab_data = mmap (0, grab_map.size, PROT_READ | PROT_WRITE, MAP_SHARED, dev, 0);
  295.   if (MAP_FAILED == grab_data) {
  296.     perror ("Cannot allocate video4linux grabber buffer ");
  297.     exit (1); }
  298.  
  299.     /* feed up the mmapped frames */
  300.     if (-1 == ioctl(dev,VIDIOCMCAPTURE,&grab_buf[0])) {
  301.       fprintf(stderr,"error in ioctl VIDIOCMCAPTURE: %s",strerror(errno));
  302.     }   
  303.        
  304.     cur_frame = ok_frame = 0;
  305.  
  306.     return dev;
  307. }
  308.  
  309.  
  310. unsigned char *grab_one () {
  311.   int c = 0, cc=0;
  312.   /* we use just one frame
  313.   no matters about the capability of the cam
  314.   this makes grabbing much faster on my webcam
  315.   i hope also on yours
  316.   ok_frame = cur_frame;
  317.   cur_frame = (cur_frame>=grab_map.frames) ? 0 : cur_frame+1;
  318.   */
  319.  
  320.   ok_frame = 0; cur_frame = 0;
  321.  
  322.   grab_buf[ok_frame].format = palette;
  323.   if (-1 == ioctl(dev,VIDIOCSYNC,&grab_buf[ok_frame])) {
  324.     perror("error in ioctl VIDIOCSYNC: ");
  325.     return NULL;
  326.   }
  327.  
  328.   grab_buf[cur_frame].format = palette;
  329.   if (-1 == ioctl(dev,VIDIOCMCAPTURE,&grab_buf[cur_frame])) {
  330.     perror("error in ioctl VIDIOCMCAPTURE: ");
  331.     return NULL;
  332.   }
  333.  
  334.   for (c=0,cc=0;c<vid_geo.size;c++,cc+=3)
  335.   {
  336.     rgb_surface[c*3] = grab_data[grab_map.offsets[ok_frame] + cc + 2];    //red // was 2
  337.     rgb_surface[c*3+1] = grab_data[grab_map.offsets[ok_frame] + cc + 1];  //blue // 1
  338.     rgb_surface[c*3+2] = grab_data[grab_map.offsets[ok_frame] + cc + 0];  //green
  339.    
  340.   }
  341.  
  342.   return rgb_surface;
  343.  
  344. }
  345.  
  346.  
  347. unsigned char get_red(int x, int y)
  348. {
  349.   return rgb_surface[(x+y*IMAGE_WIDTH)*3];
  350. }
  351.  
  352. unsigned char get_blue(int x, int y)
  353. {
  354.   return rgb_surface[(x+y*IMAGE_WIDTH)*3+2];
  355. }
  356.  
  357. unsigned char get_green(int x, int y)
  358. {
  359.   return rgb_surface[(x+y*IMAGE_WIDTH)*3+1];
  360. }
  361.  
  362. unsigned char get_rd(int x, int y)
  363. {
  364.   unsigned char r, g, b;
  365.        r = get_red(x,y);
  366.        b = get_blue(x,y);
  367.        g = get_green(x,y);
  368.        return 255 * r / (b + g + r + 1);
  369. }
  370.  
  371. unsigned char thresh(unsigned char i)
  372. {
  373.   if (i >= threshold_value) i = 255; else i = 0;
  374.   return i;
  375. }
  376.  
  377. int main()
  378. {
  379.   int fd;       /* sound device file descriptor */
  380.   int arg;      /* argument for ioctl calls */
  381.   int status;   /* return status of system calls */
  382.  
  383.   int row, column;
  384.  
  385.   unsigned char r,g,b,grey,ahh;
  386.  
  387.   float power;
  388.  
  389.   float pointer_x=0, pointer_y=0;
  390.  
  391.   int frame_count = 0;
  392.  
  393.   int found_pointer = 0;
  394.  
  395.  
  396.   int s_cap = 50;
  397.  
  398.  
  399.   //BALL
  400.   float bx = 10, by = 10, bxs = 3, bys = 0;
  401.   float f, dist;
  402.  
  403.   /* Declare SDL Variables */
  404.   SDL_Surface *screen;
  405.   SDL_Event event;
  406.    
  407.   SDL_Rect temp_rect;
  408.  
  409.   /* Initialize SDL, exit if there is an error. */
  410.   if( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
  411.     fprintf(stderr, "Could not initialize SDL: %s\n",
  412.             SDL_GetError());
  413.     return -1;
  414.   }
  415.  
  416.   /* When the program is through executing, call SDL_Quit */
  417.   atexit(SDL_Quit);
  418.  
  419.   /* Grab a surface on the screen */
  420.   screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 32, SDL_SWSURFACE|SDL_ANYFORMAT);
  421.   if( !screen ) {
  422.     fprintf(stderr, "Couldn't create a surface: %s\n",
  423.             SDL_GetError());
  424.     return -1;
  425.   }
  426.  
  427.  
  428.   struct stat st;
  429.   if( stat("/dev/video",&st) <0)
  430.     strcpy(device,"/dev/video0");
  431.   else
  432.     strcpy(device,"/dev/video");
  433.  
  434.  
  435.   //***Attempt detection of capture device***
  436.   if( vid_detect(device) > 0 ) {
  437.     vid_init();
  438.   } else
  439.     exit(-1);
  440.  
  441.  
  442.   while (1) { /* loop until Control-C */
  443.    
  444.     //capture a frame from the webcam and store it in a rgb_surfacescale bitmap
  445.     grab_one();
  446.  
  447.     found_pointer = 0;
  448.    
  449.    
  450.     //display the image
  451.     for (row = 0; row < IMAGE_HEIGHT; row++)
  452.     {
  453.       for (column = 0; column < IMAGE_WIDTH; column++)
  454.       {
  455.        temp_rect.x = column*SCALE;
  456.        temp_rect.y = row*SCALE;
  457.        temp_rect.w = SCALE;
  458.        temp_rect.h = SCALE;
  459.        
  460.        ahh = 0;
  461.        
  462.        
  463.        power =
  464.              thresh(get_rd(column+1,row-1))
  465.            + thresh(get_rd(column+1,row))
  466.            + thresh(get_rd(column+1,row+1))
  467.            + thresh(get_rd(column,row-1))
  468.            + thresh(get_rd(column,row))
  469.            + thresh(get_rd(column,row+1))
  470.            + thresh(get_rd(column-1,row-1))
  471.            + thresh(get_rd(column-1,row))
  472.            + thresh(get_rd(column-1,row+1));
  473.        
  474.        power = power / 9;
  475.      
  476.        
  477.        /*
  478.        power =
  479.        get_rd(column+1,row-1)
  480.        + get_rd(column+1,row)
  481.        + get_rd(column+1,row+1)
  482.        + get_rd(column,row-1)
  483.        + get_rd(column,row)
  484.        + get_rd(column,row+1)
  485.        + get_rd(column-1,row-1)
  486.        + get_rd(column-1,row)
  487.        + get_rd(column-1,row+1);
  488.        
  489.        power = power / 9;
  490.        
  491.        
  492.        
  493.        power =
  494.        get_rd(column+1,row-1)
  495.        * get_rd(column+1,row)
  496.        * get_rd(column+1,row+1)
  497.        * get_rd(column,row-1)
  498.        * get_rd(column,row)
  499.        * get_rd(column,row+1)
  500.        * get_rd(column-1,row-1)
  501.        * get_rd(column-1,row)
  502.        * get_rd(column-1,row+1);
  503.        
  504.        power = pow(power, 1/9);
  505.        */
  506.        
  507.        if (power > 130)
  508.        {
  509.          grey = 255;
  510.          
  511.          if (found_pointer == 0)
  512.          {
  513.           found_pointer = 1;
  514.           pointer_x = (pointer_x+column*SCALE)/2;
  515.           pointer_y = (pointer_y+row*SCALE)/2;
  516.           ahh = 255;
  517.          }
  518.        
  519.          
  520.        } else grey = 0;
  521.        
  522.        //if (grey > threshold_value) grey = 255; else grey + 0;
  523.        
  524.        r = get_red(column,row);
  525.        b = get_blue(column,row);
  526.        g = get_green(column,row);
  527.        
  528.        //SDL_FillRect( screen, &temp_rect, SDL_MapRGB(screen->format,r*power/255,g*power/255,b*power/255));
  529.        SDL_FillRect( screen, &temp_rect, SDL_MapRGB(screen->format,r,g,b));
  530.       }
  531.    
  532.     }
  533.    
  534.     //draw pointer
  535.     temp_rect.x = pointer_x-5;
  536.     temp_rect.y = pointer_y-5;
  537.     temp_rect.w = 10;
  538.     temp_rect.h = 10;
  539.     SDL_FillRect( screen, &temp_rect, SDL_MapRGB(screen->format,0,0,255));
  540.    
  541.     //deal with the ball
  542.     bx += bxs; by += bys; //move the ball
  543.     bys += 2; //planitary gravity
  544.     bxs *= .97; bys *= .97; //dampen motion
  545.     if (by > SCREEN_HEIGHT) bys = -bys; //bounce!
  546.     if (bx < 0) {bxs = abs(bxs) + .1; bx = 1;}
  547.     if (bx > SCREEN_WIDTH) {bxs = -abs(bxs) - .1; by = SCREEN_WIDTH-1;}
  548.     //display the "ball"
  549.     temp_rect.x = bx-5;
  550.     temp_rect.y = by-5;
  551.     temp_rect.w = 10;
  552.     temp_rect.h = 10;
  553.     SDL_FillRect( screen, &temp_rect, SDL_MapRGB(screen->format,0,255,0));
  554.     //repel from pointer
  555.     dist = sqrt(pow((pointer_x - bx),2) + pow((pointer_y-by),2)); /* Calculate distance */
  556.     if (dist < 30) f = -30 / pow(dist,2); //calculate force
  557.     bxs += f*(pointer_x-bx); /* Influence object in correct direction */
  558.     bys += f*(pointer_y-by);
  559.     if (bxs > s_cap) bxs = s_cap;
  560.     if (bxs < -s_cap) bxs = -s_cap;
  561.     if (bys > s_cap) bys = s_cap;
  562.     if (bys < -s_cap) bys = -s_cap;
  563.    
  564.     //make the changes to the screen visable
  565.     SDL_Flip(screen);
  566.    
  567.               //clear screen
  568.     SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format,0,0,0) );
  569.    
  570.     //test for events
  571.     {
  572.       SDL_PumpEvents();
  573.       SDL_Event event;
  574.       while ( SDL_PollEvent(&event) ) {
  575.         switch (event.type) {
  576.           case SDL_KEYDOWN:
  577.             switch (event.key.keysym.sym) {
  578.               case SDLK_i:
  579.                 TOGGLE_invert = (TOGGLE_invert + 1) % 2;
  580.                 printf("invert filter = %d\n",TOGGLE_invert);
  581.                 break;
  582.                 case SDLK_t: //toggle sonification on/off
  583.                   TOGGLE_threshold = (TOGGLE_threshold + 1) % 2;
  584.                   printf("threshold filter = %d\n",TOGGLE_threshold);
  585.                   break;
  586.               case SDLK_MINUS:
  587.                 if ((int) threshold_value - 8 >= 0) threshold_value-=8;
  588.                 printf("threshold value = %d\n", threshold_value);
  589.                 break;
  590.                 case SDLK_EQUALS: //plus key
  591.                   if ((int) threshold_value + 8 <= 255) threshold_value+=8;
  592.                   printf("threshold value = %d\n", threshold_value);
  593.                   break;
  594.             }
  595.             break;
  596.           case SDL_QUIT:
  597.             exit(0);
  598.         }
  599.       }
  600.     } //END EVENT CODE
  601.    
  602.    
  603.    
  604.    
  605.   }
  606. }

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