/* * HQX DSP routines * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/common.h" #include "hqxdsp.h" static inline void idct_col(int16_t *blk, const uint8_t *quant) { int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF; int t10, t11, t12, t13; int s0, s1, s2, s3, s4, s5, s6, s7; s0 = (int) blk[0 * 8] * quant[0 * 8]; s1 = (int) blk[1 * 8] * quant[1 * 8]; s2 = (int) blk[2 * 8] * quant[2 * 8]; s3 = (int) blk[3 * 8] * quant[3 * 8]; s4 = (int) blk[4 * 8] * quant[4 * 8]; s5 = (int) blk[5 * 8] * quant[5 * 8]; s6 = (int) blk[6 * 8] * quant[6 * 8]; s7 = (int) blk[7 * 8] * quant[7 * 8]; t0 = (int)(s3 * 19266U + s5 * 12873U) >> 15; t1 = (int)(s5 * 19266U - s3 * 12873U) >> 15; t2 = ((int)(s7 * 4520U + s1 * 22725U) >> 15) - t0; t3 = ((int)(s1 * 4520U - s7 * 22725U) >> 15) - t1; t4 = t0 * 2 + t2; t5 = t1 * 2 + t3; t6 = t2 - t3; t7 = t3 * 2 + t6; t8 = (int)(t6 * 11585U) >> 14; t9 = (int)(t7 * 11585U) >> 14; tA = (int)(s2 * 8867U - s6 * 21407U) >> 14; tB = (int)(s6 * 8867U + s2 * 21407U) >> 14; tC = (s0 >> 1) - (s4 >> 1); tD = (s4 >> 1) * 2 + tC; tE = tC - (tA >> 1); tF = tD - (tB >> 1); t10 = tF - t5; t11 = tE - t8; t12 = tE + (tA >> 1) * 2 - t9; t13 = tF + (tB >> 1) * 2 - t4; blk[0 * 8] = t13 + t4 * 2; blk[1 * 8] = t12 + t9 * 2; blk[2 * 8] = t11 + t8 * 2; blk[3 * 8] = t10 + t5 * 2; blk[4 * 8] = t10; blk[5 * 8] = t11; blk[6 * 8] = t12; blk[7 * 8] = t13; } static inline void idct_row(int16_t *blk) { int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF; int t10, t11, t12, t13; t0 = (blk[3] * 19266 + blk[5] * 12873) >> 14; t1 = (blk[5] * 19266 - blk[3] * 12873) >> 14; t2 = ((blk[7] * 4520 + blk[1] * 22725) >> 14) - t0; t3 = ((blk[1] * 4520 - blk[7] * 22725) >> 14) - t1; t4 = t0 * 2 + t2; t5 = t1 * 2 + t3; t6 = t2 - t3; t7 = t3 * 2 + t6; t8 = (t6 * 11585) >> 14; t9 = (t7 * 11585) >> 14; tA = (blk[2] * 8867 - blk[6] * 21407) >> 14; tB = (blk[6] * 8867 + blk[2] * 21407) >> 14; tC = blk[0] - blk[4]; tD = blk[4] * 2 + tC; tE = tC - tA; tF = tD - tB; t10 = tF - t5; t11 = tE - t8; t12 = tE + tA * 2 - t9; t13 = tF + tB * 2 - t4; blk[0] = (t13 + t4 * 2 + 4) >> 3; blk[1] = (t12 + t9 * 2 + 4) >> 3; blk[2] = (t11 + t8 * 2 + 4) >> 3; blk[3] = (t10 + t5 * 2 + 4) >> 3; blk[4] = (t10 + 4) >> 3; blk[5] = (t11 + 4) >> 3; blk[6] = (t12 + 4) >> 3; blk[7] = (t13 + 4) >> 3; } static void hqx_idct_put(uint16_t *dst, ptrdiff_t stride, int16_t *block, const uint8_t *quant) { int i, j; for (i = 0; i < 8; i++) idct_col(block + i, quant + i); for (i = 0; i < 8; i++) idct_row(block + i * 8); for (i = 0; i < 8; i++) { for (j = 0; j < 8; j++) { int v = av_clip_uintp2(block[j + i * 8] + 0x800, 12); dst[j] = (v << 4) | (v >> 8); } dst += stride >> 1; } } av_cold void ff_hqxdsp_init(HQXDSPContext *c) { c->idct_put = hqx_idct_put; }