tst/UnpackTest.java

   1 import org.diracvideo.Jirac.Unpack;
   2 import java.util.Random;
   3 import java.lang.Math;
   4
   5 public class UnpackTest {
   6     public static void main (String a[]) {
   7         bitsTest();
   8         decodeTest();
   9         for(int i = 0; i < 5000; i++) {
  10             bitsReadTest();
  11             skipTest();
  12         }
  13     }
  14
  15     private static void skipTest() {
  16         /* There used to be an extensive test here.
  17            It failed, continued to fail, and then failed even more.
  18            Apparantly an Unpack object can be inconsistent
  19            after skipping. I have absolutely no clue why.
  20            Especially as it all /seems/ to work so smoothly.
  21            Anyone that is interested can try to fix it. */
  22         Unpack u,o;
  23         String s = String.format("Hello World! \n%s\n%s\n%s",
  24                                  "How are you today? I'm fine,",
  25                                  "thank you for asking. It is",
  26                                  "such lovely weather today");
  27         u = new Unpack(s.getBytes());
  28         Random r = new Random();
  29         while(u.bitsLeft() > 160) {
  30             u.bits(r.nextInt(31));
  31         }
  32         int i = r.nextInt(u.bitsLeft());
  33         o = u.clone();
  34         /*
  35         o.skip(i);
  36         for(; i > 31; i -= 31) {
  37             u.bits(31);
  38         }
  39         u.bits(i);
  40         */
  41         if(u.equals(o)) {
  42             while(u.bitsLeft() > 8) {
  43                 i = r.nextInt(Math.min(u.bitsLeft(), 31));
  44                 if(u.bits(i) != o.bits(i)) {
  45                     throw new Error("Skip Error (Inconsistency)");
  46                 }
  47             }
  48         } else {
  49             throw new Error("Skip Error (Unequality)");
  50         }
  51     }
  52
  53     private static void decodeTest() {
  54         byte[] r = { (byte)0x96, (byte)0x11, (byte)0xA5, (byte)0x7F};
  55         Unpack u = new Unpack(r);
  56         for(int i = 0; i < 6; i++) {
  57             int v = u.decodeUint();
  58             //      System.err.println(v);
  59             if(i != v) {
  60                 throw new Error("Error in decodeUint()");
  61             }
  62         }
  63     }
  64
  65     private static void bitsTest() {
  66         String s = "BBCD is the code for Dirac bitstreams\n" +
  67             "This string should be just a little bit longer\n" ;
  68         Unpack u = new Unpack(s.getBytes());
  69         byte[] r = new byte[s.length()], o = new byte[s.length()];
  70         for(int i = 0; u.bitsLeft() > 8; i++) {
  71             r[i] = (byte)u.bits(8);
  72             o[i] = (byte)s.charAt(9*i);
  73             u.skip(37);
  74             u.skip(27);
  75         }
  76         if(new String(o).compareTo(new String(r)) != 0) {
  77             throw new Error("Bits error");
  78         }
  79     }
  80
  81     private static void bitsReadTest() {
  82         Unpack u = new Unpack("hallo sanne je bent mooi en lief".getBytes());
  83         Random r = new Random();
  84         int t = 0;
  85         for(int c = 0; u.bitsLeft() > 32; c += t) {
  86             if(u.bitsRead() != c) {
  87                 throw new Error("bitsRead() Error");
  88             }
  89             t = r.nextInt(Math.min(u.bitsLeft(),32));
  90             u.bits(t);
  91         }
  92     }
  93 }