Thread: Save frame as jpeg

Hi there guys i'm playing playing around with artoolki t and i want to insert a function in here by pressing keyboard key C it save a frame from the simplelite example,
Can any one help me with this.

Code:

/*
 *  simpleLite.c
 *
 *  Some code to demonstrate use of gsub_lite's argl*() functions.
 *  Shows the correct GLUT usage to read a video frame (in the idle callback)
 *  and to draw it (in the display callback).
 *
 *  Press '?' while running for help on available key commands.
 *
 *  Copyright (c) 2001-2007 Philip Lamb (PRL) [email protected]. All rights reserved.
 *
 *    Rev        Date        Who        Changes
 *    1.0.0    20040302    PRL        Initial version, simple test animation using GLUT.
 *    1.0.1    20040721    PRL        Correctly sets window size; supports arVideoDispOption().
 *
 */
/*
 * 
 * This file is part of ARToolKit.
 * 
 * ARToolKit is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * ARToolKit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with ARToolKit; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 */




// ============================================================================
//    Includes
// ============================================================================


#include <stdio.h>
#include <stdlib.h>// malloc(), free()
#ifdef __APPLE__
#  include <GLUT/glut.h>
#else
#  include <GL/glut.h>
#endif
#include <AR/config.h>
#include <AR/video.h>
#include <AR/param.h>// arParamDisp()
#include <AR/ar.h>
#include <AR/gsub_lite.h>


// ============================================================================
//    Constants
// ============================================================================


#define VIEW_SCALEFACTOR        0.025// 1.0 ARToolKit unit becomes 0.025 of my OpenGL units.
#define VIEW_DISTANCE_MIN        0.1// Objects closer to the camera than this will not be displayed.
#define VIEW_DISTANCE_MAX        100.0// Objects further away from the camera than this will not be displayed.


// ============================================================================
//    Global variables
// ============================================================================


// Preferences.
static int prefWindowed = TRUE;
staticint prefWidth = 640;                    // Fullscreen mode width.
staticint prefHeight = 480;                // Fullscreen mode height.
staticint prefDepth = 32;                    // Fullscreen mode bit depth.
staticint prefRefresh = 0;                    // Fullscreen mode refresh rate. Set to 0 to use default rate.


// Image acquisition.
static ARUint8        *gARTImage = NULL;


// Marker detection.
static int            gARTThreshhold = 100;
static long            gCallCountMarkerDetect = 0;


// Transformation matrix retrieval.
staticdouble        gPatt_width     = 80.0;    // Per-marker, but we are using only 1 marker.
staticdouble        gPatt_centre[2] = {0.0, 0.0}; // Per-marker, but we are using only 1 marker.
staticdouble        gPatt_trans[3][4];        // Per-marker, but we are using only 1 marker.
staticint            gPatt_found = FALSE;    // Per-marker, but we are using only 1 marker.
staticint            gPatt_id;                // Per-marker, but we are using only 1 marker.


// Drawing.
static ARParam        gARTCparam;
static ARGL_CONTEXT_SETTINGS_REF gArglSettings = NULL;
static int gDrawRotate = FALSE;
static float gDrawRotateAngle = 0;            // For use in drawing.


// ============================================================================
//    Functions
// ============================================================================


// Something to look at, draw a rotating colour cube.
staticvoid DrawCube(void)
{
// Colour cube data.
    static GLuint polyList = 0;
    float fSize = 0.5f;
    long f, i;    
    const GLfloat cube_vertices [8][3] = {
    {1.0, 1.0, 1.0}, {1.0, -1.0, 1.0}, {-1.0, -1.0, 1.0}, {-1.0, 1.0, 1.0},
    {1.0, 1.0, -1.0}, {1.0, -1.0, -1.0}, {-1.0, -1.0, -1.0}, {-1.0, 1.0, -1.0} };
    const GLfloat cube_vertex_colors [8][3] = {
    {1.0, 1.0, 1.0}, {1.0, 1.0, 0.0}, {0.0, 1.0, 0.0}, {0.0, 1.0, 1.0},
    {1.0, 0.0, 1.0}, {1.0, 0.0, 0.0}, {0.0, 0.0, 0.0}, {0.0, 0.0, 1.0} };
    GLint cube_num_faces = 6;
    const short cube_faces [6][4] = {
    {3, 2, 1, 0}, {2, 3, 7, 6}, {0, 1, 5, 4}, {3, 0, 4, 7}, {1, 2, 6, 5}, {4, 5, 6, 7} };
    
    if (!polyList) {
        polyList = glGenLists (1);
        glNewList(polyList, GL_COMPILE);
glBegin (GL_QUADS);
        for (f = 0; f < cube_num_faces; f++)
            for (i = 0; i < 4; i++) {
                glColor3f (cube_vertex_colors[cube_faces[f][i]][0], cube_vertex_colors[cube_faces[f][i]][1], cube_vertex_colors[cube_faces[f][i]][2]);
                glVertex3f(cube_vertices[cube_faces[f][i]][0] * fSize, cube_vertices[cube_faces[f][i]][1] * fSize, cube_vertices[cube_faces[f][i]][2] * fSize);
            }
        glEnd ();
        glColor3f (0.0, 0.0, 0.0);
        for (f = 0; f < cube_num_faces; f++) {
glBegin (GL_LINE_LOOP);
            for (i = 0; i < 4; i++)
                glVertex3f(cube_vertices[cube_faces[f][i]][0] * fSize, cube_vertices[cube_faces[f][i]][1] * fSize, cube_vertices[cube_faces[f][i]][2] * fSize);
            glEnd ();
        }
glEndList ();
    }
    
glPushMatrix(); // Save world coordinate system.
glTranslatef(0.0, 0.0, 0.5); // Place base of cube on marker surface.
glRotatef(gDrawRotateAngle, 0.0, 0.0, 1.0); // Rotate about z axis.
glDisable(GL_LIGHTING);    // Just use colours.
glCallList(polyList);    // Draw the cube.
glPopMatrix();    // Restore world coordinate system.
    
}


static void DrawCubeUpdate(float timeDelta)
{
if (gDrawRotate) {
gDrawRotateAngle += timeDelta * 45.0f; // Rotate cube at 45 degrees per second.
if (gDrawRotateAngle > 360.0f) gDrawRotateAngle -= 360.0f;
    }
}


staticint setupCamera(constchar *cparam_name, char *vconf, ARParam *cparam)
{    
    ARParam            wparam;
intxsize, ysize;


// Open the video path.
    if (arVideoOpen(vconf) < 0) {
fprintf(stderr, "setupCamera(): Unable to open connection to camera.\n");
return (FALSE);
    }
    
// Find the size of the window.
    if (arVideoInqSize(&xsize, &ysize) < 0) return (FALSE);
fprintf(stdout, "Camera image size (x,y) = (%d,%d)\n", xsize, ysize);
    
// Load the camera parameters, resize for the window and init.
    if (arParamLoad(cparam_name, 1, &wparam) < 0) {
fprintf(stderr, "setupCamera(): Error loading parameter file %s for camera.\n", cparam_name);
        return (FALSE);
    }
    arParamChangeSize(&wparam, xsize, ysize, cparam);
fprintf(stdout, "*** Camera Parameter ***\n");
arParamDisp(cparam);
    
arInitCparam(cparam);


if (arVideoCapStart() != 0) {
fprintf(stderr, "setupCamera(): Unable to begin camera data capture.\n");
return (FALSE);        
    }
    
return (TRUE);
}


static int setupMarker(const char *patt_name, int *patt_id)
{
// Loading only 1 pattern in this example.
    if ((*patt_id = arLoadPatt(patt_name)) < 0) {
fprintf(stderr, "setupMarker(): pattern load error !!\n");
return (FALSE);
    }


return (TRUE);
}


// Report state of ARToolKit global variables arFittingMode,
// arImageProcMode, arglDrawMode, arTemplateMatchingMode, arMatchingPCAMode.
static void debugReportMode(const ARGL_CONTEXT_SETTINGS_REF arglContextSettings)
{
if (arFittingMode == AR_FITTING_TO_INPUT) {
fprintf(stderr, "FittingMode (Z): INPUT IMAGE\n");
    } else {
fprintf(stderr, "FittingMode (Z): COMPENSATED IMAGE\n");
    }
    
if (arImageProcMode == AR_IMAGE_PROC_IN_FULL) {
fprintf(stderr, "ProcMode (X)   : FULL IMAGE\n");
    } else {
fprintf(stderr, "ProcMode (X)   : HALF IMAGE\n");
    }
    
    if (arglDrawModeGet(arglContextSettings) == AR_DRAW_BY_GL_DRAW_PIXELS) {
fprintf(stderr, "DrawMode (C)   : GL_DRAW_PIXELS\n");
    } else if (arglTexmapModeGet(arglContextSettings) == AR_DRAW_TEXTURE_FULL_IMAGE) {
fprintf(stderr, "DrawMode (C)   : TEXTURE MAPPING (FULL RESOLUTION)\n");
    } else {
fprintf(stderr, "DrawMode (C)   : TEXTURE MAPPING (HALF RESOLUTION)\n");
    }
        
if (arTemplateMatchingMode == AR_TEMPLATE_MATCHING_COLOR) {
fprintf(stderr, "TemplateMatchingMode (M)   : Color Template\n");
    } else {
fprintf(stderr, "TemplateMatchingMode (M)   : BW Template\n");
    }
    
if (arMatchingPCAMode == AR_MATCHING_WITHOUT_PCA) {
fprintf(stderr, "MatchingPCAMode (P)   : Without PCA\n");
    } else {
fprintf(stderr, "MatchingPCAMode (P)   : With PCA\n");
    }
}


staticvoid Quit(void)
{
arglCleanup(gArglSettings);
arVideoCapStop();
arVideoClose();
    exit(0);
}


staticvoid Keyboard(unsignedchar key, int x, int y)
{
intmode;
    switch (key) {
        case 0x1B:                        // Quit.
        case 'Q':
        case 'q':
            Quit();
break;
        case ' ':
gDrawRotate = !gDrawRotate;
break;
        case 'C':
        case 'c':
mode = arglDrawModeGet(gArglSettings);
if (mode == AR_DRAW_BY_GL_DRAW_PIXELS) {
arglDrawModeSet(gArglSettings, AR_DRAW_BY_TEXTURE_MAPPING);
arglTexmapModeSet(gArglSettings, AR_DRAW_TEXTURE_FULL_IMAGE);
            } else {
mode = arglTexmapModeGet(gArglSettings);
if (mode == AR_DRAW_TEXTURE_FULL_IMAGE)    arglTexmapModeSet(gArglSettings, AR_DRAW_TEXTURE_HALF_IMAGE);
elsearglDrawModeSet(gArglSettings, AR_DRAW_BY_GL_DRAW_PIXELS);
            }
fprintf(stderr, "*** Camera - %f (frame/sec)\n", (double)gCallCountMarkerDetect/arUtilTimer());
gCallCountMarkerDetect = 0;
arUtilTimerReset();
debugReportMode(gArglSettings);
break;
        case 'D':
        case 'd':
arDebug = !arDebug;
break;
        case '?':
        case '/':
printf("Keys:\n");
printf(" q or [esc]    Quit demo.\n");
printf(" c             Change arglDrawMode and arglTexmapMode.\n");
printf(" d             Activate / deactivate debug mode.\n");
printf(" ? or /        Show this help.\n");
printf("\nAdditionally, the ARVideo library supplied the following help text:\n");
arVideoDispOption();
break;
default:
break;
    }
}


staticvoid Idle(void)
{
    static int ms_prev;
    int ms;
    float s_elapsed;
ARUint8 *image;


ARMarkerInfo    *marker_info;                    // Pointer to array holding the details of detected markers.
int             marker_num;                        // Count of number of markers detected.
    int             j, k;
    
// Find out how long since Idle() last ran.
    ms = glutGet(GLUT_ELAPSED_TIME);
    s_elapsed = (float)(ms - ms_prev) * 0.001;
if (s_elapsed < 0.01f) return; // Don't update more often than 100 Hz.
    ms_prev = ms;
    
// Update drawing.
DrawCubeUpdate(s_elapsed);
/*ARUint8 *arVideoGetImage(void)
    {
        PUCHAR imag;
        FILE *fp;
        fp=fopen("hiro.jpg", "rb");
        fread(imag, 1, 230400, fp);
        fclose(fp);
        return imag;
    }*/
    
// Grab a video frame.
    if ((image = arVideoGetImage()) != NULL) {
gARTImage = image;    // Save the fetched image.
        
gCallCountMarkerDetect++; // Increment ARToolKit FPS counter.
        
// Detect the markers in the video frame.
        if (arDetectMarker(gARTImage, gARTThreshhold, &marker_info, &marker_num) < 0) {
            exit(-1);
        }
        
// Check through the marker_info array for highest confidence
// visible marker matching our preferred pattern.
        k = -1;
        for (j = 0; j < marker_num; j++) {
            if (marker_info[j].id == gPatt_id) {
if (k == -1) k = j; // First marker detected.
                else if(marker_info[j].cf > marker_info[k].cf) k = j; // Higher confidence marker detected.
            }
        }
        
        if (k != -1) {
// Get the transformation between the marker and the real camera into gPatt_trans.
arGetTransMat(&(marker_info[k]), gPatt_centre, gPatt_width, gPatt_trans);
gPatt_found = TRUE;
        } else {
gPatt_found = FALSE;
        }
        
// Tell GLUT the display has changed.
glutPostRedisplay();
    }
}


//
//    This function is called on events when the visibility of the
//    GLUT window changes (including when it first becomes visible).
//
static void Visibility(int visible)
{
    if (visible == GLUT_VISIBLE) {
glutIdleFunc(Idle);
    } else {
glutIdleFunc(NULL);
    }
}


//
//    This function is called when the
//    GLUT window is resized.
//
static void Reshape(int w, int h)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
    
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();


// Call through to anyone else who needs to know about window sizing here.
}


//
// This function is called when the window needs redrawing.
//
staticvoid Display(void)
{
    GLdouble p[16];
GLdouble m[16];
    
// Select correct buffer for this context.
glDrawBuffer(GL_BACK);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the buffers for new frame.
    
arglDispImage(gARTImage, &gARTCparam, 1.0, gArglSettings);    // zoom = 1.0.
arVideoCapNext();
gARTImage = NULL; // Image data is no longer valid after calling arVideoCapNext().
                
// Projection transformation.
arglCameraFrustumRH(&gARTCparam, VIEW_DISTANCE_MIN, VIEW_DISTANCE_MAX, p);
glMatrixMode(GL_PROJECTION);
glLoadMatrixd(p);
glMatrixMode(GL_MODELVIEW);
        
// Viewing transformation.
glLoadIdentity();
// Lighting and geometry that moves with the camera should go here.
// (I.e. must be specified before viewing transformations.)
//none
    
if (gPatt_found) {
    
// Calculate the camera position relative to the marker.
// Replace VIEW_SCALEFACTOR with 1.0 to make one drawing unit equal to 1.0 ARToolKit units (usually millimeters).
arglCameraViewRH(gPatt_trans, m, VIEW_SCALEFACTOR);
glLoadMatrixd(m);


// All lighting and geometry to be drawn relative to the marker goes here.
DrawCube();
    
    } // gPatt_found
    
// Any 2D overlays go here.
//none
    
glutSwapBuffers();
}


int main(int argc, char** argv)
{
    char glutGamemode[32];
constchar *cparam_name = "Data/camera_para.dat";
//
// Camera configuration.
//
#ifdef _WIN32
char            *vconf = "Data\\WDM_camera_flipV.xml";
#else
    char            *vconf = "";
#endif
constchar *patt_name  = "Data/patt.hiro";
    
// ----------------------------------------------------------------------------
// Library inits.
//


    glutInit(&argc, argv);


// ----------------------------------------------------------------------------
// Hardware setup.
//


if (!setupCamera(cparam_name, vconf, &gARTCparam)) {
fprintf(stderr, "main(): Unable to set up AR camera.\n");
        exit(-1);
    }


// ----------------------------------------------------------------------------
// Library setup.
//


// Set up GL context(s) for OpenGL to draw into.
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
if (!prefWindowed) {
if (prefRefresh) sprintf(glutGamemode, "%ix%i:%i@%i", prefWidth, prefHeight, prefDepth, prefRefresh);
elsesprintf(glutGamemode, "%ix%i:%i", prefWidth, prefHeight, prefDepth);
glutGameModeString(glutGamemode);
glutEnterGameMode();
    } else {
glutInitWindowSize(prefWidth, prefHeight);
glutCreateWindow(argv[0]);
    }


// Setup argl library for current context.
if ((gArglSettings = arglSetupForCurrentContext()) == NULL) {
fprintf(stderr, "main(): arglSetupForCurrentContext() returned error.\n");
        exit(-1);
    }
debugReportMode(gArglSettings);
glEnable(GL_DEPTH_TEST);
arUtilTimerReset();
        
if (!setupMarker(patt_name, &gPatt_id)) {
fprintf(stderr, "main(): Unable to set up AR marker.\n");
        Quit();
    }
    
// Register GLUT event-handling callbacks.
// NB: Idle() is registered by Visibility.
glutDisplayFunc(Display);
glutReshapeFunc(Reshape);
glutVisibilityFunc(Visibility);
glutKeyboardFunc(Keyboard);
    
glutMainLoop();


return (0);
}