mirror of
https://github.com/FFmpeg/FFmpeg.git
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22526c1f55
Based on work by Kostya Shishkov <kostya.shishkov@gmail.com>. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* Canopus HQ/HQA decoder
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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/attributes.h"
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#include "libavutil/common.h"
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#include "hq_hqadsp.h"
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#define FIX_1_082 17734
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#define FIX_1_847 30274
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#define FIX_1_414 23170
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#define FIX_2_613 21407 // divided by two to fit the range
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#define IDCTMUL(a, b) ((a) * (b) >> 16)
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static inline void idct_row(int16_t *blk)
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{
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int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8, tmp9, tmpA;
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int tmpB, tmpC, tmpD, tmpE, tmpF, tmp10, tmp11, tmp12, tmp13, tmp14;
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tmp0 = blk[5] - blk[3];
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tmp1 = blk[5] + blk[3];
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tmp2 = blk[1] - blk[7];
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tmp3 = blk[1] + blk[7];
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tmp4 = tmp3 - tmp1;
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tmp5 = IDCTMUL(tmp0 + tmp2, FIX_1_847);
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tmp6 = IDCTMUL(tmp2, FIX_1_082) - tmp5;
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tmp7 = tmp5 - IDCTMUL(tmp0, FIX_2_613) * 2;
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tmp8 = tmp3 + tmp1;
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tmp9 = tmp7 * 4 - tmp8;
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tmpA = IDCTMUL(tmp4, FIX_1_414) * 4 - tmp9;
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tmpB = tmp6 * 4 + tmpA;
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tmpC = blk[2] + blk[6];
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tmpD = blk[2] - blk[6];
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tmpE = blk[0] - blk[4];
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tmpF = blk[0] + blk[4];
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tmp10 = IDCTMUL(tmpD, FIX_1_414) * 4 - tmpC;
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tmp11 = tmpE - tmp10;
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tmp12 = tmpF - tmpC;
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tmp13 = tmpE + tmp10;
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tmp14 = tmpF + tmpC;
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blk[0] = tmp14 + tmp8;
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blk[1] = tmp13 + tmp9;
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blk[2] = tmp11 + tmpA;
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blk[3] = tmp12 - tmpB;
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blk[4] = tmp12 + tmpB;
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blk[5] = tmp11 - tmpA;
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blk[6] = tmp13 - tmp9;
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blk[7] = tmp14 - tmp8;
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}
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static inline void idct_col(int16_t *blk)
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{
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int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8, tmp9, tmpA;
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int tmpB, tmpC, tmpD, tmpE, tmpF, tmp10, tmp11, tmp12, tmp13, tmp14;
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tmp0 = blk[5 * 8] - blk[3 * 8];
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tmp1 = blk[5 * 8] + blk[3 * 8];
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tmp2 = blk[1 * 8] * 2 - (blk[7 * 8] >> 2);
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tmp3 = blk[1 * 8] * 2 + (blk[7 * 8] >> 2);
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tmp4 = tmp3 - tmp1;
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tmp5 = IDCTMUL(tmp0 + tmp2, FIX_1_847);
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tmp6 = IDCTMUL(tmp2, FIX_1_082) - tmp5;
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tmp7 = tmp5 - IDCTMUL(tmp0, FIX_2_613) * 2;
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tmp8 = (tmp3 + tmp1) >> 1;
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tmp9 = tmp7 * 2 - tmp8;
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tmpA = IDCTMUL(tmp4, FIX_1_414) * 2 - tmp9;
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tmpB = tmp6 * 2 + tmpA;
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tmpC = blk[2 * 8] + (blk[6 * 8] >> 1) >> 1;
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tmpD = blk[2 * 8] - (blk[6 * 8] >> 1);
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tmpE = (blk[0 * 8] >> 1) - (blk[4 * 8] >> 1) + 0x2020;
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tmpF = (blk[0 * 8] >> 1) + (blk[4 * 8] >> 1) + 0x2020;
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tmp10 = IDCTMUL(tmpD, FIX_1_414) * 2 - tmpC;
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tmp11 = tmpE - tmp10;
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tmp12 = tmpF - tmpC;
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tmp13 = tmpE + tmp10;
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tmp14 = tmpF + tmpC;
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blk[0 * 8] = (tmp14 + tmp8) >> 6;
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blk[1 * 8] = (tmp13 + tmp9) >> 6;
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blk[2 * 8] = (tmp11 + tmpA) >> 6;
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blk[3 * 8] = (tmp12 - tmpB) >> 6;
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blk[4 * 8] = (tmp12 + tmpB) >> 6;
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blk[5 * 8] = (tmp11 - tmpA) >> 6;
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blk[6 * 8] = (tmp13 - tmp9) >> 6;
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blk[7 * 8] = (tmp14 - tmp8) >> 6;
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}
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static void hq_idct_put(uint8_t *dst, int stride, int16_t *block)
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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_row(block + i * 8);
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for (i = 0; i < 8; i++)
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idct_col(block + i);
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 8; j++)
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dst[j] = av_clip_uint8(block[j + i * 8]);
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dst += stride;
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}
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}
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av_cold void ff_hqdsp_init(HQDSPContext *c)
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{
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c->idct_put = hq_idct_put;
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}
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