Grab a 24-bit image off the StarterVideo

Demo/sgi/video/svgrab24.c

@@ -0,0 +1,97 @@
+/*
+ * svgrab24 - Grab the current video input image into an rgb file.
+ *
+ * Jack Jansen, CWI, May 93.
+ *
+ * Adapted from grabone.c
+ */
+
+#ident "$Revision$"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <svideo.h>
+#include <gl/gl.h>
+#include <gl/device.h>
+#include <getopt.h>
+#include <image.h>
+
+main(int argc, char *argv[])
+{
+    SVhandle V;
+    svCaptureInfo ci;
+    boolean debug;
+    int ch, errflg;
+    int bufferSize;
+    long *buffer;
+    IMAGE *imgfile;
+    short *r, *g, *b;
+    int x, y;
+    char *ProgName = argv[0];
+
+    debug = FALSE;
+    ci.format = SV_RGB32_FRAMES;
+    ci.width = 0;
+    ci.height = 0;
+    ci.size = 1;
+
+    argv++; argc--;
+    if ( argc > 2 && strcmp(argv[0], "-w") == 0) {
+	ci.width = atoi(argv[1]);
+	argc -= 2;
+	argv += 2;
+    }
+    if ( argc != 1 ) {
+	fprintf(stderr, "Usage: %s [-w width] rgbfilename\n", ProgName);
+	exit(1);
+    }
+
+    /* Open video device */
+    if ((V = svOpenVideo()) == NULL) {
+	svPerror("open");
+	exit(1);
+    }
+
+    if (svQueryCaptureBufferSize(V, &ci, &bufferSize) < 0) {
+        svPerror("svQueryCaptureBufferSize");
+        exit(1);
+    }
+    buffer = malloc(bufferSize);
+
+    if (svCaptureOneFrame(V, ci.format, &ci.width, &ci.height, buffer) < 0) {
+        svPerror("svCaptureOneFrame");
+        exit(1);
+    }
+    if (debug) {
+        printf("captured size: %d by %d\n", ci.width, ci.height);
+    }
+
+    if ( (imgfile=iopen(argv[0], "w", RLE(1), 3, ci.width, ci.height, 3)) == 0) {
+	perror(argv[1]);
+	exit(1);
+    }
+    r = (short *)malloc(ci.width*sizeof(short));
+    g = (short *)malloc(ci.width*sizeof(short));
+    b = (short *)malloc(ci.width*sizeof(short));
+    if ( !r || !g || !b ) {
+	fprintf(stderr, "%s: malloc failed\n", ProgName);
+	exit(1);
+    }
+    for(y=0; y<ci.height; y++) {
+	for(x=0; x<ci.width; x++) {
+	    unsigned long data = *buffer++;
+
+	    r[x] = data & 0xff;
+	    g[x] = (data>>8) & 0xff;
+	    b[x] = (data>>16) & 0xff;
+	}
+	if ( putrow(imgfile, r, y, 0) == 0 ||
+	     putrow(imgfile, g, y, 1) == 0 ||
+	     putrow(imgfile, b, y, 2) == 0) {
+	       fprintf(stderr, "%s: putrow failed\n", ProgName);
+	       exit(1);
+	}
+    }
+    iclose(imgfile);
+    exit(0);
+}