- int i, j;
- /* compute mdct windows */
- for (i = 0; i < 36; i++) {
- for (j = 0; j < 4; j++) {
- double d;
-
- if (j == 2 && i % 3 != 1)
- continue;
-
- d = sin(M_PI * (i + 0.5) / 36.0);
- if (j == 1) {
- if (i >= 30) d = 0;
- else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0);
- else if (i >= 18) d = 1;
- } else if (j == 3) {
- if (i < 6) d = 0;
- else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0);
- else if (i < 18) d = 1;
- }
- //merge last stage of imdct into the window coefficients
- d *= 0.5 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72);
-
- if (j == 2)
- RENAME(ff_mdct_win)[j][i/3] = FIXHR((d / (1<<5)));
- else {
- int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18);
- RENAME(ff_mdct_win)[j][idx] = FIXHR((d / (1<<5)));
- }
- }
- }