#include "image.h"
#include <string.h>
#include <stdio.h>
+#include <pthread.h>
-CvCapture *capture;
-int captureID = -1;
+static CvCapture * g_capture = NULL;
+static int g_captureID = -1;
void Image_Handler(FCGIContext * context, char * params)
{
- int num = 0, width = 800, height = 600;
+ int num = 0, width = 1600, height = 1200; // Set Default values
FCGIValue val[] = {
{"num", &num, FCGI_INT_T},
{"width", &width, FCGI_INT_T},
{"height", &height, FCGI_INT_T}
};
- if (!FCGI_ParseRequest(context, params, val, 3))
+ if (!FCGI_ParseRequest(context, params, val, 3)) // Populate val
return;
- else if (num < 0 || num > 1) {
+ // Ensure the camera id is 0 or 1. Even though we plan to only have 1 camera attached at a time, this will allow 2. increase
+ else if (num < 0 || num > 1) {
FCGI_RejectJSON(context, "Invalid capture number");
return;
+ // Ensure valid widths
} else if (width <= 0 || height <= 0) {
FCGI_RejectJSON(context, "Invalid width/height");
return;
}
+
+ IplImage * src = NULL; // Source Image
+ CvMat * encoded = NULL; // Encoded Image
- if (captureID != num) {
- if (captureID >= 0) {
- cvReleaseCapture(&capture);
- }
- capture = cvCreateCameraCapture(num);
- captureID = num;
- }
+ Camera_GetImage( num, width, height ,&src);
- cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, width);
- cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, height);
+ Log(LOGDEBUG, "About to encode");
+ encoded = cvEncodeImage(".jpg",src,0);
+ Log(LOGDEBUG, "Encoded");
- static int p[] = {CV_IMWRITE_JPEG_QUALITY, 100, 0};
+ Log(LOGNOTE, "Sending image!");
+ FCGI_PrintRaw("Content-type: image/jpg\r\n");
+ FCGI_PrintRaw("Cache-Control: no-cache, no-store, must-revalidate\r\n\r\n");
+ //FCGI_PrintRaw("Content-Length: %d", g_encoded->rows*g_encoded->cols);
+ FCGI_WriteBinary(encoded->data.ptr,1,encoded->rows*encoded->cols);
+
+ cvReleaseMat(&encoded);
+ cvReleaseImageHeader(&src);
+}
+
+/**
+ * Attempts to get an image from a camera
+ * @param num - Camera id
+ * @param width - Width to force
+ * @param height - Height to force
+ * @param image - Pointer to CvMat* to set with result
+ * @returns true on success, false on error
+ */
+ bool Camera_GetImage(int num, int width, int height, IplImage ** frame)
+ {
+ Log(LOGDEBUG, "Called with arguments num=%d width=%d height=%d frame=%p", num,width,height, frame);
+ static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; // Need to use a mutex to ensure 2 captures are not open at once
+ pthread_mutex_lock(&mutex);
+ bool result = false;
- IplImage * frame = cvQueryFrame(capture);
- assert(frame != NULL);
+ if( g_capture == NULL)
+ {
+ g_capture = cvCreateCameraCapture(num);
+ g_captureID = num;
+ }
+ else if( num != g_captureID)
+ {
+ cvReleaseCapture(&g_capture);
+ g_capture = cvCreateCameraCapture(num);
+ g_captureID = num;
+ }
-// CvMat stub;
- // CvMat * background = cvGetMat(frame, &stub, 0, 0);
+ //cvSetCaptureProperty(g_capture, CV_CAP_PROP_FRAME_WIDTH, width);
+ //cvSetCaptureProperty(g_capture, CV_CAP_PROP_FRAME_HEIGHT, height);
-// CvMat *cv8u = cvCreateMat(frame->width, frame->height, CV_8U);
-// double min, max;
-// CvPoint a,b;
-// cvMinMaxLoc(background, &min, &max, &a, &b, 0);
-
-// double ccscale = 255.0/(max-min);
-// double ccshift = -min;
- //cvCvtScale(frame, cv8u, ccscale, ccshift);
- CvMat * jpg = cvEncodeImage(".jpg", frame, p);
+ *frame = cvQueryFrame(g_capture);
+ result = (*frame != NULL);
- // Will this work?
- Log(LOGNOTE, "Sending image!");
- FCGI_PrintRaw("Content-type: image/jpg\r\n");
- FCGI_PrintRaw("Cache-Control: no-cache, no-store, must-revalidate\r\n\r\n");
- //FCGI_PrintRaw("Content-Length: %d", jpg->rows*jpg->cols);
- FCGI_WriteBinary(jpg->data.ptr,1,jpg->rows*jpg->cols);
+ //cvShowImage("display", *image);
+ //cvWaitKey(0);
+ //cvSaveImage("test.jpg",*image,0);
+
+ Log(LOGDEBUG, "At end of mutex");
- cvReleaseMat(&jpg);
- cvReleaseImageHeader(&frame);
+ pthread_mutex_unlock(&mutex); //Close the mutex
+
+ //NOTE: Never have a "return" statement before the mutex is unlocked; it causes deadlocks!
+ return result;
}
+
+void Image_Cleanup()
+{
+ // Release the capture and IplImage pointers
+ //cvReleaseImageHeader(&g_frame);
+ cvReleaseCapture(&g_capture);
+}
+