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318 lines
8.1 KiB
318 lines
8.1 KiB
/* |
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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 "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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static void vp3_idct_c(int32_t *dequantized_data, int16_t *output_data) |
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{ |
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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; |
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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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void vp3_idct_put_c(int16_t *input_data, int16_t *dequant_matrix, |
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int coeff_count, uint8_t *dest, int stride) |
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{ |
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int32_t dequantized_data[64]; |
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int16_t transformed_data[64]; |
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int16_t *op; |
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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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vp3_idct_c(dequantized_data, transformed_data); |
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/* place in final output */ |
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op = transformed_data; |
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for (i = 0; i < 8; i++) { |
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for (j = 0; j < 8; j++) { |
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if (*op < -128) |
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*dest = 0; |
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else if (*op > 127) |
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*dest = 255; |
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else |
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*dest = (uint8_t)(*op + 128); |
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op++; |
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dest++; |
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} |
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dest += (stride - 8); |
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} |
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} |
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void vp3_idct_add_c(int16_t *input_data, int16_t *dequant_matrix, |
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int coeff_count, uint8_t *dest, int stride) |
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{ |
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int32_t dequantized_data[64]; |
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int16_t transformed_data[64]; |
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int16_t *op; |
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int i, j; |
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int16_t sample; |
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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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vp3_idct_c(dequantized_data, transformed_data); |
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/* place in final output */ |
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op = transformed_data; |
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for (i = 0; i < 8; i++) { |
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for (j = 0; j < 8; j++) { |
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sample = *dest + *op; |
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if (sample < 0) |
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*dest = 0; |
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else if (sample > 255) |
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*dest = 255; |
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else |
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*dest = (uint8_t)(sample & 0xFF); |
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op++; |
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dest++; |
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} |
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dest += (stride - 8); |
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} |
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}
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