private static int checkBufYUV(byte[] buf, int size, int w, int h, int subsamp) throws Exception {
int row, col;
int hsf = TJ.getMCUWidth(subsamp) / 8, vsf = TJ.getMCUHeight(subsamp) / 8;
int pw = PAD(w, hsf), ph = PAD(h, vsf);
int cw = pw / hsf, ch = ph / vsf;
int ypitch = PAD(pw, 4), uvpitch = PAD(cw, 4);
int retval = 1;
int correctsize = ypitch * ph + (subsamp == TJ.SAMP_GRAY ? 0 : uvpitch * ch * 2);
int halfway = 16;
try {
if (size != correctsize)
throw new Exception("\nIncorrect size " + size + ". Should be " + correctsize);
for (row = 0; row < ph; row++) {
for (col = 0; col < pw; col++) {
byte y = buf[ypitch * row + col];
if (((row / 8) + (col / 8)) % 2 == 0) {
if (row < halfway) checkVal255(row, col, y, "Y");
else checkVal0(row, col, y, "Y");
} else {
if (row < halfway) checkVal(row, col, y, "Y", 76);
else checkVal(row, col, y, "Y", 226);
}
}
}
if (subsamp != TJ.SAMP_GRAY) {
halfway = 16 / vsf;
for (row = 0; row < ch; row++) {
for (col = 0; col < cw; col++) {
byte u = buf[ypitch * ph + (uvpitch * row + col)],
v = buf[ypitch * ph + uvpitch * ch + (uvpitch * row + col)];
if (((row * vsf / 8) + (col * hsf / 8)) % 2 == 0) {
checkVal(row, col, u, "U", 128);
checkVal(row, col, v, "V", 128);
} else {
if (row < halfway) {
checkVal(row, col, u, "U", 85);
checkVal255(row, col, v, "V");
} else {
checkVal0(row, col, u, "U");
checkVal(row, col, v, "V", 149);
}
}
}
}
}
} catch (Exception e) {
System.out.println(e);
retval = 0;
}
if (retval == 0) {
for (row = 0; row < ph; row++) {
for (col = 0; col < pw; col++) {
int y = buf[ypitch * row + col];
if (y < 0) y += 256;
System.out.format("%3d ", y);
}
System.out.print("\n");
}
System.out.print("\n");
for (row = 0; row < ch; row++) {
for (col = 0; col < cw; col++) {
int u = buf[ypitch * ph + (uvpitch * row + col)];
if (u < 0) u += 256;
System.out.format("%3d ", u);
}
System.out.print("\n");
}
System.out.print("\n");
for (row = 0; row < ch; row++) {
for (col = 0; col < cw; col++) {
int v = buf[ypitch * ph + uvpitch * ch + (uvpitch * row + col)];
if (v < 0) v += 256;
System.out.format("%3d ", v);
}
System.out.print("\n");
}
System.out.print("\n");
}
return retval;
}