xvinfo的代码

/* $XFree86: xc/programs/xvinfo/xvinfo.c,v 1.8 2002/01/22 23:05:43 mvojkovi Exp $ */

#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xvlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

static void
PrintUsage(void)
{
   fprintf(stderr, "Usage:  xvinfo [-display host:dpy]/n");
   exit(0);
}

int main(int argc, char *argv[])
{
    Display *dpy;
    unsigned int ver, rev, eventB, reqB, errorB; 
    int i, j, k, n; 
    unsigned int nencode, nadaptors;
    int nscreens, nattr, numImages;
    XvAdaptorInfo *ainfo;
    XvAttribute *attributes;
    XvEncodingInfo *encodings;
    XvFormat *format;
    XvImageFormatValues *formats;
    char * disname = NULL;

    if((argc != 1) && (argc != 3))
       PrintUsage();

    if(argc != 1) {
       if(strcmp(argv[1], "-display"))
  PrintUsage();
disname = argv[2];
    }


    if(!(dpy = XOpenDisplay(disname))) 
    {
fprintf(stderr, "xvinfo:  Unable to open display %s/n",
                       (disname != NULL) ? disname : XDisplayName(NULL));
exit(-1);
    }

    if((Success != XvQueryExtension(dpy, &ver, &rev, &reqB, &eventB, &errorB))) 
    {
fprintf(stderr, "xvinfo: No X-Video Extension on %s/n",
                        (disname != NULL) ? disname : XDisplayName(NULL));
exit(0);
    } 
    else
    {
fprintf(stdout, "X-Video Extension version %i.%i/n", ver, rev);
    }

    nscreens = ScreenCount(dpy);

    for(i = 0; i < nscreens; i++) {
  fprintf(stdout, "screen #%i/n", i);
XvQueryAdaptors(dpy, RootWindow(dpy, i), &nadaptors, &ainfo);

if(!nadaptors) {
    fprintf(stdout, " no adaptors present/n");
    continue;
} 

for(j = 0; j < nadaptors; j++) {
    fprintf(stdout, "  Adaptor #%i: /"%s/"/n", j, ainfo[j].name);
    fprintf(stdout, "    number of ports: %li/n", ainfo[j].num_ports);
    fprintf(stdout, "    port base: %li/n", ainfo[j].base_id);
    fprintf(stdout, "    operations supported: ");
    switch(ainfo[j].type & (XvInputMask | XvOutputMask)) {
    case XvInputMask:
     if(ainfo[j].type & XvVideoMask) 
fprintf(stdout, "PutVideo ");
     if(ainfo[j].type & XvStillMask) 
fprintf(stdout, "PutStill ");
     if(ainfo[j].type & XvImageMask) 
fprintf(stdout, "PutImage ");
     break;
    case XvOutputMask:
     if(ainfo[j].type & XvVideoMask) 
fprintf(stdout, "GetVideo ");
     if(ainfo[j].type & XvStillMask) 
fprintf(stdout, "GetStill ");
     break;
    default:
fprintf(stdout, "none ");
break;
    }
    fprintf(stdout, "/n");

    format = ainfo[j].formats;

    fprintf(stdout, "    supported visuals:/n");
    for(k = 0; k < ainfo[j].num_formats; k++, format++) {
         fprintf(stdout, "      depth %i, visualID 0x%2lx/n",
 format->depth, format->visual_id);
    }

    attributes = XvQueryPortAttributes(dpy, ainfo[j].base_id, &nattr);

    if(attributes && nattr) {
fprintf(stdout, "    number of attributes: %i/n", nattr);

for(k = 0; k < nattr; k++) {
    fprintf(stdout, "      /"%s/" (range %i to %i)/n",
attributes[k].name, 
attributes[k].min_value,
attributes[k].max_value);

    if(attributes[k].flags & XvSettable)
    fprintf(stdout, "              client settable attribute/n");

    if(attributes[k].flags & XvGettable) {
Atom the_atom;
int value;

    fprintf(stdout, "              client gettable attribute");
the_atom = XInternAtom(dpy, attributes[k].name, True);

if(the_atom != None){
   if((Success == XvGetPortAttribute(dpy, 
ainfo[j].base_id, the_atom, &value)))
           fprintf(stdout, " (current value is %i)", value);
}
        fprintf(stdout, "/n");
    }

}
XFree(attributes);
    } else {
fprintf(stdout, "    no port attributes defined/n");
    }

    XvQueryEncodings(dpy, ainfo[j].base_id,
&nencode, &encodings);

    if(encodings && nencode) {
int ImageEncodings = 0;

for(n = 0; n < nencode; n++) {
    if(!strcmp(encodings[n].name, "XV_IMAGE"))
ImageEncodings++;
}

if(nencode - ImageEncodings) {
    fprintf(stdout, "    number of encodings: %i/n", 
nencode - ImageEncodings);

    for(n = 0; n < nencode; n++) {
    if(strcmp(encodings[n].name, "XV_IMAGE")) {
    fprintf(stdout, "      encoding ID #%li: /"%s/"/n",
encodings[n].encoding_id,
encodings[n].name);
    fprintf(stdout, "        size: %li x %li/n",
encodings[n].width,
encodings[n].height);
    fprintf(stdout, "        rate: %f/n",
(float)encodings[n].rate.numerator/
(float)encodings[n].rate.denominator);
}
    }
}

if(ImageEncodings && (ainfo[j].type & XvImageMask)) {
   char imageName[5] = {0, 0, 0, 0, 0};

   for(n = 0; n < nencode; n++) {
      if(!strcmp(encodings[n].name, "XV_IMAGE")) {
fprintf(stdout, 
"    maximum XvImage size: %li x %li/n",
encodings[n].width, encodings[n].height);
break;
      }
   }

                   formats = XvListImageFormats(
dpy, ainfo[j].base_id, &numImages);

   fprintf(stdout, "    Number of image formats: %i/n",
numImages);

   for(n = 0; n < numImages; n++) {
memcpy(imageName, &(formats[n].id), 4);
fprintf(stdout, "      id: 0x%x", formats[n].id);
if(isprint(imageName[0]) && isprint(imageName[1]) &&
  isprint(imageName[2]) && isprint(imageName[3])) 
{
  fprintf(stdout, " (%s)/n", imageName);
} else {
  fprintf(stdout, "/n");
}
fprintf(stdout, "        guid: ");
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[0]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[1]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[2]);
fprintf(stdout, "%02x-", (unsigned char) 
formats[n].guid[3]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[4]);
fprintf(stdout, "%02x-", (unsigned char) 
formats[n].guid[5]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[6]);
fprintf(stdout, "%02x-", (unsigned char) 
formats[n].guid[7]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[8]);
fprintf(stdout, "%02x-", (unsigned char) 
formats[n].guid[9]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[10]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[11]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[12]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[13]);
fprintf(stdout, "%02x", (unsigned char) 
formats[n].guid[14]);
fprintf(stdout, "%02x/n", (unsigned char) 
formats[n].guid[15]);

fprintf(stdout, "        bits per pixel: %i/n",
formats[n].bits_per_pixel);
fprintf(stdout, "        number of planes: %i/n",
formats[n].num_planes);
fprintf(stdout, "        type: %s (%s)/n", 
 (formats[n].type == XvRGB) ? "RGB" : "YUV",
 (formats[n].format == XvPacked) ? "packed" : "planar");

if(formats[n].type == XvRGB) {
    fprintf(stdout, "        depth: %i/n", 
                                        formats[n].depth);

    fprintf(stdout, "        red, green, blue masks: " 
"0x%x, 0x%x, 0x%x/n", 
formats[n].red_mask,
formats[n].green_mask,
formats[n].blue_mask);
} else {

}


   }
   if(formats) XFree(formats);
}

XvFreeEncodingInfo(encodings);
    }
    
}

XvFreeAdaptorInfo(ainfo);
    }
    return 1;
}