@Test
public void sortedArrayEncodeDecodeTest() {
Random rand = new Random();
int size = 1000000;
int[] values = new int[size];
for (int i = 0; i < size; i++) {
values[i] = rand.nextInt() & 0x0fffffff;
}
values[5] = 175384; // force collision
values[8] = 175384;
values[15] = 275384; // force neighbours
values[18] = 275385;
Arrays.sort(values);
byte[] ab = new byte[3000000];
StatCoderContext ctx = new StatCoderContext(ab);
ctx.encodeSortedArray(values, 0, size, 0x08000000, 0);
ctx = new StatCoderContext(ab);
int[] decodedValues = new int[size];
ctx.decodeSortedArray(decodedValues, 0, size, 0x08000000, 0);
for (int i = 0; i < size; i++) {
if (values[i] != decodedValues[i]) {
Assert.fail("mismatch at i=" + i + " " + values[i] + "<>" + decodedValues[i]);
}
}
}
@Test
public void predictedValueEncodeDecodeTest() {
byte[] ab = new byte[80000];
StatCoderContext ctx = new StatCoderContext(ab);
for (int value = -100; value < 100; value += 5) {
for (int predictor = -200; predictor < 200; predictor += 7) {
ctx.encodePredictedValue(value, predictor);
}
}
ctx = new StatCoderContext(ab);
for (int value = -100; value < 100; value += 5) {
for (int predictor = -200; predictor < 200; predictor += 7) {
int decodedValue = ctx.decodePredictedValue(predictor);
if (value != decodedValue) {
Assert.fail(
"value mismatch: value="
+ value
+ " predictor="
+ predictor
+ " decodedValue="
+ decodedValue);
}
}
}
}
@Test
public void noisyVarBitsEncodeDecodeTest() {
byte[] ab = new byte[40000];
StatCoderContext ctx = new StatCoderContext(ab);
for (int noisybits = 0; noisybits < 12; noisybits++) {
for (int i = 0; i < 1000; i++) {
ctx.encodeNoisyNumber(i, noisybits);
}
}
ctx = new StatCoderContext(ab);
for (int noisybits = 0; noisybits < 12; noisybits++) {
for (int i = 0; i < 1000; i++) {
int value = ctx.decodeNoisyNumber(noisybits);
if (value != i) {
Assert.fail("value mismatch: noisybits=" + noisybits + " i=" + i + " value=" + value);
}
}
}
}