/* * Canopus HQ/HQA decoder * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/attributes.h" #include "libavutil/common.h" #include "hq_hqadsp.h" #define FIX_1_082 17734 #define FIX_1_847 30274 #define FIX_1_414 23170 #define FIX_2_613 21407 // divided by two to fit the range #define IDCTMUL(a, b) ((a) * (b) >> 16) static inline void idct_row(int16_t *blk) { int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8, tmp9, tmpA; int tmpB, tmpC, tmpD, tmpE, tmpF, tmp10, tmp11, tmp12, tmp13, tmp14; tmp0 = blk[5] - blk[3]; tmp1 = blk[5] + blk[3]; tmp2 = blk[1] - blk[7]; tmp3 = blk[1] + blk[7]; tmp4 = tmp3 - tmp1; tmp5 = IDCTMUL(tmp0 + tmp2, FIX_1_847); tmp6 = IDCTMUL(tmp2, FIX_1_082) - tmp5; tmp7 = tmp5 - IDCTMUL(tmp0, FIX_2_613) * 2; tmp8 = tmp3 + tmp1; tmp9 = tmp7 * 4 - tmp8; tmpA = IDCTMUL(tmp4, FIX_1_414) * 4 - tmp9; tmpB = tmp6 * 4 + tmpA; tmpC = blk[2] + blk[6]; tmpD = blk[2] - blk[6]; tmpE = blk[0] - blk[4]; tmpF = blk[0] + blk[4]; tmp10 = IDCTMUL(tmpD, FIX_1_414) * 4 - tmpC; tmp11 = tmpE - tmp10; tmp12 = tmpF - tmpC; tmp13 = tmpE + tmp10; tmp14 = tmpF + tmpC; blk[0] = tmp14 + tmp8; blk[1] = tmp13 + tmp9; blk[2] = tmp11 + tmpA; blk[3] = tmp12 - tmpB; blk[4] = tmp12 + tmpB; blk[5] = tmp11 - tmpA; blk[6] = tmp13 - tmp9; blk[7] = tmp14 - tmp8; } static inline void idct_col(int16_t *blk) { int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8, tmp9, tmpA; int tmpB, tmpC, tmpD, tmpE, tmpF, tmp10, tmp11, tmp12, tmp13, tmp14; tmp0 = blk[5 * 8] - blk[3 * 8]; tmp1 = blk[5 * 8] + blk[3 * 8]; tmp2 = blk[1 * 8] * 2 - (blk[7 * 8] >> 2); tmp3 = blk[1 * 8] * 2 + (blk[7 * 8] >> 2); tmp4 = tmp3 - tmp1; tmp5 = IDCTMUL(tmp0 + tmp2, FIX_1_847); tmp6 = IDCTMUL(tmp2, FIX_1_082) - tmp5; tmp7 = tmp5 - IDCTMUL(tmp0, FIX_2_613) * 2; tmp8 = (tmp3 + tmp1) >> 1; tmp9 = tmp7 * 2 - tmp8; tmpA = IDCTMUL(tmp4, FIX_1_414) * 2 - tmp9; tmpB = tmp6 * 2 + tmpA; tmpC = blk[2 * 8] + (blk[6 * 8] >> 1) >> 1; tmpD = blk[2 * 8] - (blk[6 * 8] >> 1); tmpE = (blk[0 * 8] >> 1) - (blk[4 * 8] >> 1) + 0x2020; tmpF = (blk[0 * 8] >> 1) + (blk[4 * 8] >> 1) + 0x2020; tmp10 = IDCTMUL(tmpD, FIX_1_414) * 2 - tmpC; tmp11 = tmpE - tmp10; tmp12 = tmpF - tmpC; tmp13 = tmpE + tmp10; tmp14 = tmpF + tmpC; blk[0 * 8] = (tmp14 + tmp8) >> 6; blk[1 * 8] = (tmp13 + tmp9) >> 6; blk[2 * 8] = (tmp11 + tmpA) >> 6; blk[3 * 8] = (tmp12 - tmpB) >> 6; blk[4 * 8] = (tmp12 + tmpB) >> 6; blk[5 * 8] = (tmp11 - tmpA) >> 6; blk[6 * 8] = (tmp13 - tmp9) >> 6; blk[7 * 8] = (tmp14 - tmp8) >> 6; } static void hq_idct_put(uint8_t *dst, int stride, int16_t *block) { int i, j; for (i = 0; i < 8; i++) idct_row(block + i * 8); for (i = 0; i < 8; i++) idct_col(block + i); for (i = 0; i < 8; i++) { for (j = 0; j < 8; j++) dst[j] = av_clip_uint8(block[j + i * 8]); dst += stride; } } av_cold void ff_hqdsp_init(HQDSPContext *c) { c->idct_put = hq_idct_put; }