mirror of
https://git.ffmpeg.org/ffmpeg.git
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260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/*
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* Copyright (C) 2004 the ffmpeg project
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file vp3dsp.c
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* Standard C DSP-oriented functions cribbed from the original VP3
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* source code.
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*/
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "vp3data.h"
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#define IdctAdjustBeforeShift 8
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#define xC1S7 64277
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#define xC2S6 60547
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#define xC3S5 54491
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#define xC4S4 46341
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#define xC5S3 36410
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#define xC6S2 25080
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#define xC7S1 12785
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void vp3_dsp_init_c(void)
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{
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/* nop */
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}
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void vp3_idct_c(int16_t *input_data, int16_t *dequant_matrix,
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int coeff_count, int16_t *output_data)
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{
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int32_t dequantized_data[64];
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int32_t *ip = dequantized_data;
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int16_t *op = output_data;
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int32_t A_, B_, C_, D_, _Ad, _Bd, _Cd, _Dd, E_, F_, G_, H_;
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int32_t _Ed, _Gd, _Add, _Bdd, _Fd, _Hd;
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int32_t t1, t2;
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int i, j;
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/* de-zigzag and dequantize */
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for (i = 0; i < coeff_count; i++) {
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j = dezigzag_index[i];
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dequantized_data[j] = dequant_matrix[i] * input_data[i];
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}
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/* Inverse DCT on the rows now */
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for (i = 0; i < 8; i++) {
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/* Check for non-zero values */
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if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) {
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t1 = (int32_t)(xC1S7 * ip[1]);
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t2 = (int32_t)(xC7S1 * ip[7]);
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t1 >>= 16;
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t2 >>= 16;
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A_ = t1 + t2;
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t1 = (int32_t)(xC7S1 * ip[1]);
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t2 = (int32_t)(xC1S7 * ip[7]);
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t1 >>= 16;
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t2 >>= 16;
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B_ = t1 - t2;
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t1 = (int32_t)(xC3S5 * ip[3]);
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t2 = (int32_t)(xC5S3 * ip[5]);
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t1 >>= 16;
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t2 >>= 16;
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C_ = t1 + t2;
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t1 = (int32_t)(xC3S5 * ip[5]);
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t2 = (int32_t)(xC5S3 * ip[3]);
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t1 >>= 16;
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t2 >>= 16;
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D_ = t1 - t2;
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t1 = (int32_t)(xC4S4 * (A_ - C_));
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t1 >>= 16;
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_Ad = t1;
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t1 = (int32_t)(xC4S4 * (B_ - D_));
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t1 >>= 16;
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_Bd = t1;
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_Cd = A_ + C_;
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_Dd = B_ + D_;
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t1 = (int32_t)(xC4S4 * (ip[0] + ip[4]));
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t1 >>= 16;
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E_ = t1;
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t1 = (int32_t)(xC4S4 * (ip[0] - ip[4]));
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t1 >>= 16;
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F_ = t1;
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t1 = (int32_t)(xC2S6 * ip[2]);
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t2 = (int32_t)(xC6S2 * ip[6]);
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t1 >>= 16;
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t2 >>= 16;
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G_ = t1 + t2;
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t1 = (int32_t)(xC6S2 * ip[2]);
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t2 = (int32_t)(xC2S6 * ip[6]);
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t1 >>= 16;
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t2 >>= 16;
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H_ = t1 - t2;
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_Ed = E_ - G_;
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_Gd = E_ + G_;
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_Add = F_ + _Ad;
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_Bdd = _Bd - H_;
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_Fd = F_ - _Ad;
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_Hd = _Bd + H_;
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/* Final sequence of operations over-write original inputs. */
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ip[0] = (int16_t)((_Gd + _Cd ) >> 0);
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ip[7] = (int16_t)((_Gd - _Cd ) >> 0);
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ip[1] = (int16_t)((_Add + _Hd ) >> 0);
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ip[2] = (int16_t)((_Add - _Hd ) >> 0);
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ip[3] = (int16_t)((_Ed + _Dd ) >> 0);
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ip[4] = (int16_t)((_Ed - _Dd ) >> 0);
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ip[5] = (int16_t)((_Fd + _Bdd ) >> 0);
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ip[6] = (int16_t)((_Fd - _Bdd ) >> 0);
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}
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ip += 8; /* next row */
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}
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ip = dequantized_data;
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for ( i = 0; i < 8; i++) {
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/* Check for non-zero values (bitwise or faster than ||) */
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if ( ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
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ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
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t1 = (int32_t)(xC1S7 * ip[1*8]);
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t2 = (int32_t)(xC7S1 * ip[7*8]);
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t1 >>= 16;
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t2 >>= 16;
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A_ = t1 + t2;
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t1 = (int32_t)(xC7S1 * ip[1*8]);
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t2 = (int32_t)(xC1S7 * ip[7*8]);
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t1 >>= 16;
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t2 >>= 16;
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B_ = t1 - t2;
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t1 = (int32_t)(xC3S5 * ip[3*8]);
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t2 = (int32_t)(xC5S3 * ip[5*8]);
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t1 >>= 16;
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t2 >>= 16;
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C_ = t1 + t2;
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t1 = (int32_t)(xC3S5 * ip[5*8]);
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t2 = (int32_t)(xC5S3 * ip[3*8]);
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t1 >>= 16;
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t2 >>= 16;
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D_ = t1 - t2;
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t1 = (int32_t)(xC4S4 * (A_ - C_));
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t1 >>= 16;
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_Ad = t1;
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t1 = (int32_t)(xC4S4 * (B_ - D_));
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t1 >>= 16;
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_Bd = t1;
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_Cd = A_ + C_;
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_Dd = B_ + D_;
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t1 = (int32_t)(xC4S4 * (ip[0*8] + ip[4*8]));
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t1 >>= 16;
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E_ = t1;
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t1 = (int32_t)(xC4S4 * (ip[0*8] - ip[4*8]));
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t1 >>= 16;
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F_ = t1;
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t1 = (int32_t)(xC2S6 * ip[2*8]);
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t2 = (int32_t)(xC6S2 * ip[6*8]);
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t1 >>= 16;
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t2 >>= 16;
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G_ = t1 + t2;
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t1 = (int32_t)(xC6S2 * ip[2*8]);
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t2 = (int32_t)(xC2S6 * ip[6*8]);
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t1 >>= 16;
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t2 >>= 16;
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H_ = t1 - t2;
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_Ed = E_ - G_;
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_Gd = E_ + G_;
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_Add = F_ + _Ad;
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_Bdd = _Bd - H_;
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_Fd = F_ - _Ad;
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_Hd = _Bd + H_;
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_Gd += IdctAdjustBeforeShift;
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_Add += IdctAdjustBeforeShift;
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_Ed += IdctAdjustBeforeShift;
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_Fd += IdctAdjustBeforeShift;
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/* Final sequence of operations over-write original inputs. */
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op[0*8] = (int16_t)((_Gd + _Cd ) >> 4);
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op[7*8] = (int16_t)((_Gd - _Cd ) >> 4);
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op[1*8] = (int16_t)((_Add + _Hd ) >> 4);
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op[2*8] = (int16_t)((_Add - _Hd ) >> 4);
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op[3*8] = (int16_t)((_Ed + _Dd ) >> 4);
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op[4*8] = (int16_t)((_Ed - _Dd ) >> 4);
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op[5*8] = (int16_t)((_Fd + _Bdd ) >> 4);
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op[6*8] = (int16_t)((_Fd - _Bdd ) >> 4);
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} else {
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op[0*8] = 0;
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op[7*8] = 0;
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op[1*8] = 0;
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op[2*8] = 0;
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op[3*8] = 0;
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op[4*8] = 0;
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op[5*8] = 0;
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op[6*8] = 0;
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}
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ip++; /* next column */
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op++;
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}
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}
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