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132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*
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* HQX DSP routines
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "libavutil/common.h"
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#include "hqxdsp.h"
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static inline void idct_col(int16_t *blk, const uint8_t *quant)
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{
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int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF;
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int t10, t11, t12, t13;
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int s0, s1, s2, s3, s4, s5, s6, s7;
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s0 = (int) blk[0 * 8] * quant[0 * 8];
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s1 = (int) blk[1 * 8] * quant[1 * 8];
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s2 = (int) blk[2 * 8] * quant[2 * 8];
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s3 = (int) blk[3 * 8] * quant[3 * 8];
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s4 = (int) blk[4 * 8] * quant[4 * 8];
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s5 = (int) blk[5 * 8] * quant[5 * 8];
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s6 = (int) blk[6 * 8] * quant[6 * 8];
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s7 = (int) blk[7 * 8] * quant[7 * 8];
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t0 = (s3 * 19266 + s5 * 12873) >> 15;
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t1 = (s5 * 19266 - s3 * 12873) >> 15;
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t2 = ((s7 * 4520 + s1 * 22725) >> 15) - t0;
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t3 = ((s1 * 4520 - s7 * 22725) >> 15) - t1;
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t4 = t0 * 2 + t2;
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t5 = t1 * 2 + t3;
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t6 = t2 - t3;
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t7 = t3 * 2 + t6;
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t8 = (t6 * 11585) >> 14;
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t9 = (t7 * 11585) >> 14;
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tA = (s2 * 8867 - s6 * 21407) >> 14;
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tB = (s6 * 8867 + s2 * 21407) >> 14;
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tC = (s0 >> 1) - (s4 >> 1);
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tD = (s4 >> 1) * 2 + tC;
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tE = tC - (tA >> 1);
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tF = tD - (tB >> 1);
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t10 = tF - t5;
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t11 = tE - t8;
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t12 = tE + (tA >> 1) * 2 - t9;
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t13 = tF + (tB >> 1) * 2 - t4;
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blk[0 * 8] = t13 + t4 * 2;
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blk[1 * 8] = t12 + t9 * 2;
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blk[2 * 8] = t11 + t8 * 2;
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blk[3 * 8] = t10 + t5 * 2;
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blk[4 * 8] = t10;
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blk[5 * 8] = t11;
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blk[6 * 8] = t12;
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blk[7 * 8] = t13;
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}
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static inline void idct_row(int16_t *blk)
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{
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int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF;
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int t10, t11, t12, t13;
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t0 = (blk[3] * 19266 + blk[5] * 12873) >> 14;
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t1 = (blk[5] * 19266 - blk[3] * 12873) >> 14;
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t2 = ((blk[7] * 4520 + blk[1] * 22725) >> 14) - t0;
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t3 = ((blk[1] * 4520 - blk[7] * 22725) >> 14) - t1;
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t4 = t0 * 2 + t2;
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t5 = t1 * 2 + t3;
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t6 = t2 - t3;
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t7 = t3 * 2 + t6;
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t8 = (t6 * 11585) >> 14;
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t9 = (t7 * 11585) >> 14;
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tA = (blk[2] * 8867 - blk[6] * 21407) >> 14;
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tB = (blk[6] * 8867 + blk[2] * 21407) >> 14;
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tC = blk[0] - blk[4];
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tD = blk[4] * 2 + tC;
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tE = tC - tA;
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tF = tD - tB;
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t10 = tF - t5;
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t11 = tE - t8;
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t12 = tE + tA * 2 - t9;
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t13 = tF + tB * 2 - t4;
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blk[0] = (t13 + t4 * 2 + 4) >> 3;
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blk[1] = (t12 + t9 * 2 + 4) >> 3;
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blk[2] = (t11 + t8 * 2 + 4) >> 3;
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blk[3] = (t10 + t5 * 2 + 4) >> 3;
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blk[4] = (t10 + 4) >> 3;
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blk[5] = (t11 + 4) >> 3;
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blk[6] = (t12 + 4) >> 3;
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blk[7] = (t13 + 4) >> 3;
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}
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static void hqx_idct_put(uint16_t *dst, ptrdiff_t stride,
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int16_t *block, const uint8_t *quant)
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{
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int i, j;
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for (i = 0; i < 8; i++)
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idct_col(block + i, quant + i);
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for (i = 0; i < 8; i++)
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idct_row(block + i * 8);
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 8; j++) {
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int v = av_clip(block[j + i * 8] + 0x800, 0, 0xFFF);
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dst[j] = (v << 4) | (v >> 8);
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}
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dst += stride >> 1;
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}
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}
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av_cold void ff_hqxdsp_init(HQXDSPContext *c)
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{
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c->idct_put = hqx_idct_put;
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}
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