diff options
Diffstat (limited to 'kopete/protocols/msn/webcam/libmimic/fdct_quant.c')
| -rw-r--r-- | kopete/protocols/msn/webcam/libmimic/fdct_quant.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/kopete/protocols/msn/webcam/libmimic/fdct_quant.c b/kopete/protocols/msn/webcam/libmimic/fdct_quant.c deleted file mode 100644 index f32adc80..00000000 --- a/kopete/protocols/msn/webcam/libmimic/fdct_quant.c +++ /dev/null @@ -1,181 +0,0 @@ -/* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "mimic-private.h" - -extern guchar _col_zag[64]; - -void _fdct_quant_block(MimCtx *ctx, gint *block, const guchar *src, - gint stride, gboolean is_chrom, gint num_coeffs) -{ - gint sum1, sum2, sum3, sum4; - gint diff1, diff2, diff3, diff4; - gint ex1, ex2, ex3, ex4, ex5; - gint i, j; - const guchar *p1; - gint *iptr; - - /* - * Forward DCT, first pass (horizontal). - */ - p1 = src; - iptr = block; - - for (i = 0; i < 8; i++) { - sum1 = p1[0] + p1[7]; - sum2 = p1[1] + p1[6]; - sum3 = p1[2] + p1[5]; - sum4 = p1[3] + p1[4]; - - diff1 = p1[0] - p1[7]; - diff2 = p1[1] - p1[6]; - diff3 = p1[2] - p1[5]; - diff4 = p1[3] - p1[4]; - - ex1 = ((diff1 + diff4) * 851) - (diff1 * 282); - ex2 = ((diff2 + diff3) * 1004) - (diff2 * 804); - ex3 = ((diff2 + diff3) * 1004) - (diff3 * 1204); - ex4 = ((diff1 + diff4) * 851) - (diff4 * 1420); - - iptr[0] = sum1 + sum2 + sum3 + sum4; - iptr[2] = (((sum1 - sum4) * 1337) + ((sum2 - sum3) * 554)) >> 10; - iptr[4] = sum1 - sum2 - sum3 + sum4; - - iptr[1] = (ex1 + ex2 + ex3 + ex4) >> 10; - iptr[3] = ((ex4 - ex2) * 181) >> 17; - iptr[5] = ((ex1 - ex3) * 181) >> 17; - - p1 += stride; - iptr += 8; - } - - p1 = src; - iptr = block; - - /* - * Forward DCT, first pass (vertical). - * - * This is only known to be correct for i == 0, though it seems to be ... - */ - for (i = 0; i < 6; i++) { - sum1 = iptr[ 0 + i] + iptr[56 + i]; - sum2 = iptr[ 8 + i] + iptr[48 + i]; - sum3 = iptr[16 + i] + iptr[40 + i]; - sum4 = iptr[24 + i] + iptr[32 + i]; - - diff1 = iptr[ 0 + i] - iptr[56 + i]; - diff2 = iptr[ 8 + i] - iptr[48 + i]; - diff3 = iptr[16 + i] - iptr[40 + i]; - diff4 = iptr[24 + i] - iptr[32 + i]; - - ex1 = ((diff1 + diff4) * 851) - (diff1 * 282); - ex2 = ((diff2 + diff3) * 1004) - (diff2 * 804); - ex3 = ((diff2 + diff3) * 1004) - (diff3 * 1204); - ex4 = ((diff1 + diff4) * 851) - (diff4 * 1420); - - ex5 = (sum1 + sum2 - sum3 - sum4) * 554; - - for (j = 0; j < 7 - i; j++) { - switch (j) { - - case 0: - iptr[ 0 + i] = (16 + sum1 + sum2 + sum3 + sum4) >> 5; - break; - - case 1: - iptr[ 8 + i] = (16384 + ex1 + ex2 + ex3 + ex4) >> 15; - break; - - case 2: - iptr[16 + i] = (16384 + ((sum1 - sum4) * 783) + ex5) >> 15; - break; - - case 3: - iptr[24 + i] = (8192 + (((ex4 - ex2) >> 8) * 181)) >> 14; - break; - - case 4: - iptr[32 + i] = (16 + sum1 - sum2 - sum3 + sum4) >> 5; - break; - - case 5: - iptr[40 + i] = (8192 + (((ex1 - ex3) >> 8) * 181)) >> 14; - break; - - case 6: - iptr[48 + i] = (16384 - ((sum2 - sum3) * 1891) + ex5) >> 15; - break; - } - } - } - - /* - * Quantize. - */ - block[0] /= 2; - block[8] /= 4; - block[1] /= 4; - block[6] = 0; - - if (num_coeffs > 3) { - - gdouble s = (10000 - ctx->quality) * 10.0 * (gfloat) 9.9999997e-5; - - if (s > 10.0) - s = 10.0; - else if (is_chrom != 0 && s < 1.0) - s = 1.0; - else if (s < 2.0) - s = 2.0; - - s = 1.0 / s; - - for (i = 3; i < num_coeffs; i++) { - - gdouble coeff, r; - - coeff = block[_col_zag[i]] * s; - r = coeff - (gint) coeff; - - if (r >= 0.6) - block[_col_zag[i]] = (gint) (coeff + 1.0); - else if (r <= -0.6) - block[_col_zag[i]] = (gint) (coeff - 1.0); - else - block[_col_zag[i]] = (gint) coeff; - - if (block[_col_zag[i]] > 120) - block[_col_zag[i]] = 120; - else if (block[_col_zag[i]] < -120) - block[_col_zag[i]] = -120; - } - } - - if (block[8] > 120) - block[8] = 120; - else if (block[8] < -120) - block[8] = -120; - - if (block[1] > 120) - block[1] = 120; - else if (block[1] < -120) - block[1] = -120; - - for (i = num_coeffs; i < 64; i++) - block[_col_zag[i]] = 0; -} - |