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- /*
- * Copyright (C) 2004 the ffmpeg project
- *
- * 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
- */
-
- /**
- * @file vp3dsp.c
- * Standard C DSP-oriented functions cribbed from the original VP3
- * source code.
- */
-
- #include "common.h"
- #include "avcodec.h"
- #include "dsputil.h"
-
- #define IdctAdjustBeforeShift 8
- #define xC1S7 64277
- #define xC2S6 60547
- #define xC3S5 54491
- #define xC4S4 46341
- #define xC5S3 36410
- #define xC6S2 25080
- #define xC7S1 12785
-
- #define M(a,b) (((a) * (b))>>16)
-
- static always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
- {
- int16_t *ip = input;
- uint8_t *cm = cropTbl + MAX_NEG_CROP;
-
- int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
- int Ed, Gd, Add, Bdd, Fd, Hd;
-
- int i;
-
- /* Inverse DCT on the rows now */
- for (i = 0; i < 8; i++) {
- /* Check for non-zero values */
- if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) {
- A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
- B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
- C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
- D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);
-
- Ad = M(xC4S4, (A - C));
- Bd = M(xC4S4, (B - D));
-
- Cd = A + C;
- Dd = B + D;
-
- E = M(xC4S4, (ip[0] + ip[4]));
- F = M(xC4S4, (ip[0] - ip[4]));
-
- G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
- H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);
-
- Ed = E - G;
- Gd = E + G;
-
- Add = F + Ad;
- Bdd = Bd - H;
-
- Fd = F - Ad;
- Hd = Bd + H;
-
- /* Final sequence of operations over-write original inputs. */
- ip[0] = Gd + Cd ;
- ip[7] = Gd - Cd ;
-
- ip[1] = Add + Hd;
- ip[2] = Add - Hd;
-
- ip[3] = Ed + Dd ;
- ip[4] = Ed - Dd ;
-
- ip[5] = Fd + Bdd;
- ip[6] = Fd - Bdd;
- }
-
- ip += 8; /* next row */
- }
-
- ip = input;
-
- for ( i = 0; i < 8; i++) {
- /* Check for non-zero values (bitwise or faster than ||) */
- if ( ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
- ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
-
- A = M(xC1S7, ip[1*8]) + M(xC7S1, ip[7*8]);
- B = M(xC7S1, ip[1*8]) - M(xC1S7, ip[7*8]);
- C = M(xC3S5, ip[3*8]) + M(xC5S3, ip[5*8]);
- D = M(xC3S5, ip[5*8]) - M(xC5S3, ip[3*8]);
-
- Ad = M(xC4S4, (A - C));
- Bd = M(xC4S4, (B - D));
-
- Cd = A + C;
- Dd = B + D;
-
- E = M(xC4S4, (ip[0*8] + ip[4*8])) + 8;
- F = M(xC4S4, (ip[0*8] - ip[4*8])) + 8;
-
- if(type==1){ //HACK
- E += 16*128;
- F += 16*128;
- }
-
- G = M(xC2S6, ip[2*8]) + M(xC6S2, ip[6*8]);
- H = M(xC6S2, ip[2*8]) - M(xC2S6, ip[6*8]);
-
- Ed = E - G;
- Gd = E + G;
-
- Add = F + Ad;
- Bdd = Bd - H;
-
- Fd = F - Ad;
- Hd = Bd + H;
-
- /* Final sequence of operations over-write original inputs. */
- if(type==0){
- ip[0*8] = (Gd + Cd ) >> 4;
- ip[7*8] = (Gd - Cd ) >> 4;
-
- ip[1*8] = (Add + Hd ) >> 4;
- ip[2*8] = (Add - Hd ) >> 4;
-
- ip[3*8] = (Ed + Dd ) >> 4;
- ip[4*8] = (Ed - Dd ) >> 4;
-
- ip[5*8] = (Fd + Bdd ) >> 4;
- ip[6*8] = (Fd - Bdd ) >> 4;
- }else if(type==1){
- dst[0*stride] = cm[(Gd + Cd ) >> 4];
- dst[7*stride] = cm[(Gd - Cd ) >> 4];
-
- dst[1*stride] = cm[(Add + Hd ) >> 4];
- dst[2*stride] = cm[(Add - Hd ) >> 4];
-
- dst[3*stride] = cm[(Ed + Dd ) >> 4];
- dst[4*stride] = cm[(Ed - Dd ) >> 4];
-
- dst[5*stride] = cm[(Fd + Bdd ) >> 4];
- dst[6*stride] = cm[(Fd - Bdd ) >> 4];
- }else{
- dst[0*stride] = cm[dst[0*stride] + ((Gd + Cd ) >> 4)];
- dst[7*stride] = cm[dst[7*stride] + ((Gd - Cd ) >> 4)];
-
- dst[1*stride] = cm[dst[1*stride] + ((Add + Hd ) >> 4)];
- dst[2*stride] = cm[dst[2*stride] + ((Add - Hd ) >> 4)];
-
- dst[3*stride] = cm[dst[3*stride] + ((Ed + Dd ) >> 4)];
- dst[4*stride] = cm[dst[4*stride] + ((Ed - Dd ) >> 4)];
-
- dst[5*stride] = cm[dst[5*stride] + ((Fd + Bdd ) >> 4)];
- dst[6*stride] = cm[dst[6*stride] + ((Fd - Bdd ) >> 4)];
- }
-
- } else {
- if(type==0){
- ip[0*8] =
- ip[1*8] =
- ip[2*8] =
- ip[3*8] =
- ip[4*8] =
- ip[5*8] =
- ip[6*8] =
- ip[7*8] = ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
- }else if(type==1){
- dst[0*stride]=
- dst[1*stride]=
- dst[2*stride]=
- dst[3*stride]=
- dst[4*stride]=
- dst[5*stride]=
- dst[6*stride]=
- dst[7*stride]= 128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
- }else{
- if(ip[0*8]){
- int v= ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
- dst[0*stride] = cm[dst[0*stride] + v];
- dst[1*stride] = cm[dst[1*stride] + v];
- dst[2*stride] = cm[dst[2*stride] + v];
- dst[3*stride] = cm[dst[3*stride] + v];
- dst[4*stride] = cm[dst[4*stride] + v];
- dst[5*stride] = cm[dst[5*stride] + v];
- dst[6*stride] = cm[dst[6*stride] + v];
- dst[7*stride] = cm[dst[7*stride] + v];
- }
- }
- }
-
- ip++; /* next column */
- dst++;
- }
- }
-
- void ff_vp3_idct_c(DCTELEM *block/* align 16*/){
- idct(NULL, 0, block, 0);
- }
-
- void ff_vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
- idct(dest, line_size, block, 1);
- }
-
- void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
- idct(dest, line_size, block, 2);
- }
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