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/*
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 * Simple IDCT
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 *
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 * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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/**
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 * @file simple_idct.c
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 * simpleidct in C.
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 */
27

    
28
/*
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  based upon some outcommented c code from mpeg2dec (idct_mmx.c
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  written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
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 */
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#include "avcodec.h"
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#include "dsputil.h"
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#include "simple_idct.h"
35

    
36
#if 0
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#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
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#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
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#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
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#define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
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#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
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#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
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#define W7 565  /* 2048*sqrt (2)*cos (7*pi/16) */
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#define ROW_SHIFT 8
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#define COL_SHIFT 17
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#else
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#define W1  22725  //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W2  21407  //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W3  19266  //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W4  16383  //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W5  12873  //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W6  8867   //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W7  4520   //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define ROW_SHIFT 11
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#define COL_SHIFT 20 // 6
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#endif
57

    
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#if defined(ARCH_POWERPC_405)
59

    
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/* signed 16x16 -> 32 multiply add accumulate */
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#define MAC16(rt, ra, rb) \
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    __asm__ ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
63

    
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/* signed 16x16 -> 32 multiply */
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#define MUL16(rt, ra, rb) \
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    __asm__ ("mullhw %0, %1, %2" : "=r" (rt) : "r" (ra), "r" (rb));
67

    
68
#else
69

    
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/* signed 16x16 -> 32 multiply add accumulate */
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#define MAC16(rt, ra, rb) rt += (ra) * (rb)
72

    
73
/* signed 16x16 -> 32 multiply */
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#define MUL16(rt, ra, rb) rt = (ra) * (rb)
75

    
76
#endif
77

    
78
static inline void idctRowCondDC (DCTELEM * row)
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{
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        int a0, a1, a2, a3, b0, b1, b2, b3;
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#ifdef HAVE_FAST_64BIT
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        uint64_t temp;
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#else
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        uint32_t temp;
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#endif
86

    
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#ifdef HAVE_FAST_64BIT
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#ifdef WORDS_BIGENDIAN
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#define ROW0_MASK 0xffff000000000000LL
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#else
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#define ROW0_MASK 0xffffLL
92
#endif
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        if(sizeof(DCTELEM)==2){
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            if ( ((((uint64_t *)row)[0] & ~ROW0_MASK) |
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                  ((uint64_t *)row)[1]) == 0) {
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                temp = (row[0] << 3) & 0xffff;
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                temp += temp << 16;
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                temp += temp << 32;
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                ((uint64_t *)row)[0] = temp;
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                ((uint64_t *)row)[1] = temp;
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                return;
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            }
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        }else{
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            if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) {
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                row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3;
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                return;
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            }
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        }
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#else
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        if(sizeof(DCTELEM)==2){
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            if (!(((uint32_t*)row)[1] |
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                  ((uint32_t*)row)[2] |
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                  ((uint32_t*)row)[3] |
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                  row[1])) {
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                temp = (row[0] << 3) & 0xffff;
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                temp += temp << 16;
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                ((uint32_t*)row)[0]=((uint32_t*)row)[1] =
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                ((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp;
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                return;
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            }
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        }else{
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            if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) {
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                row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3;
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                return;
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            }
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        }
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#endif
128

    
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        a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1));
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        a1 = a0;
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        a2 = a0;
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        a3 = a0;
133

    
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        /* no need to optimize : gcc does it */
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        a0 += W2 * row[2];
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        a1 += W6 * row[2];
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        a2 -= W6 * row[2];
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        a3 -= W2 * row[2];
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        MUL16(b0, W1, row[1]);
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        MAC16(b0, W3, row[3]);
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        MUL16(b1, W3, row[1]);
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        MAC16(b1, -W7, row[3]);
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        MUL16(b2, W5, row[1]);
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        MAC16(b2, -W1, row[3]);
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        MUL16(b3, W7, row[1]);
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        MAC16(b3, -W5, row[3]);
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149
#ifdef HAVE_FAST_64BIT
150
        temp = ((uint64_t*)row)[1];
151
#else
152
        temp = ((uint32_t*)row)[2] | ((uint32_t*)row)[3];
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#endif
154
        if (temp != 0) {
155
            a0 += W4*row[4] + W6*row[6];
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            a1 += - W4*row[4] - W2*row[6];
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            a2 += - W4*row[4] + W2*row[6];
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            a3 += W4*row[4] - W6*row[6];
159

    
160
            MAC16(b0, W5, row[5]);
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            MAC16(b0, W7, row[7]);
162

    
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            MAC16(b1, -W1, row[5]);
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            MAC16(b1, -W5, row[7]);
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            MAC16(b2, W7, row[5]);
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            MAC16(b2, W3, row[7]);
168

    
169
            MAC16(b3, W3, row[5]);
170
            MAC16(b3, -W1, row[7]);
171
        }
172

    
173
        row[0] = (a0 + b0) >> ROW_SHIFT;
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        row[7] = (a0 - b0) >> ROW_SHIFT;
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        row[1] = (a1 + b1) >> ROW_SHIFT;
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        row[6] = (a1 - b1) >> ROW_SHIFT;
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        row[2] = (a2 + b2) >> ROW_SHIFT;
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        row[5] = (a2 - b2) >> ROW_SHIFT;
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        row[3] = (a3 + b3) >> ROW_SHIFT;
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        row[4] = (a3 - b3) >> ROW_SHIFT;
181
}
182

    
183
static inline void idctSparseColPut (uint8_t *dest, int line_size,
184
                                     DCTELEM * col)
185
{
186
        int a0, a1, a2, a3, b0, b1, b2, b3;
187
        uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
188

    
189
        /* XXX: I did that only to give same values as previous code */
190
        a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
191
        a1 = a0;
192
        a2 = a0;
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        a3 = a0;
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195
        a0 +=  + W2*col[8*2];
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        a1 +=  + W6*col[8*2];
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        a2 +=  - W6*col[8*2];
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        a3 +=  - W2*col[8*2];
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200
        MUL16(b0, W1, col[8*1]);
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        MUL16(b1, W3, col[8*1]);
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        MUL16(b2, W5, col[8*1]);
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        MUL16(b3, W7, col[8*1]);
204

    
205
        MAC16(b0, + W3, col[8*3]);
206
        MAC16(b1, - W7, col[8*3]);
207
        MAC16(b2, - W1, col[8*3]);
208
        MAC16(b3, - W5, col[8*3]);
209

    
210
        if(col[8*4]){
211
            a0 += + W4*col[8*4];
212
            a1 += - W4*col[8*4];
213
            a2 += - W4*col[8*4];
214
            a3 += + W4*col[8*4];
215
        }
216

    
217
        if (col[8*5]) {
218
            MAC16(b0, + W5, col[8*5]);
219
            MAC16(b1, - W1, col[8*5]);
220
            MAC16(b2, + W7, col[8*5]);
221
            MAC16(b3, + W3, col[8*5]);
222
        }
223

    
224
        if(col[8*6]){
225
            a0 += + W6*col[8*6];
226
            a1 += - W2*col[8*6];
227
            a2 += + W2*col[8*6];
228
            a3 += - W6*col[8*6];
229
        }
230

    
231
        if (col[8*7]) {
232
            MAC16(b0, + W7, col[8*7]);
233
            MAC16(b1, - W5, col[8*7]);
234
            MAC16(b2, + W3, col[8*7]);
235
            MAC16(b3, - W1, col[8*7]);
236
        }
237

    
238
        dest[0] = cm[(a0 + b0) >> COL_SHIFT];
239
        dest += line_size;
240
        dest[0] = cm[(a1 + b1) >> COL_SHIFT];
241
        dest += line_size;
242
        dest[0] = cm[(a2 + b2) >> COL_SHIFT];
243
        dest += line_size;
244
        dest[0] = cm[(a3 + b3) >> COL_SHIFT];
245
        dest += line_size;
246
        dest[0] = cm[(a3 - b3) >> COL_SHIFT];
247
        dest += line_size;
248
        dest[0] = cm[(a2 - b2) >> COL_SHIFT];
249
        dest += line_size;
250
        dest[0] = cm[(a1 - b1) >> COL_SHIFT];
251
        dest += line_size;
252
        dest[0] = cm[(a0 - b0) >> COL_SHIFT];
253
}
254

    
255
static inline void idctSparseColAdd (uint8_t *dest, int line_size,
256
                                     DCTELEM * col)
257
{
258
        int a0, a1, a2, a3, b0, b1, b2, b3;
259
        uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
260

    
261
        /* XXX: I did that only to give same values as previous code */
262
        a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
263
        a1 = a0;
264
        a2 = a0;
265
        a3 = a0;
266

    
267
        a0 +=  + W2*col[8*2];
268
        a1 +=  + W6*col[8*2];
269
        a2 +=  - W6*col[8*2];
270
        a3 +=  - W2*col[8*2];
271

    
272
        MUL16(b0, W1, col[8*1]);
273
        MUL16(b1, W3, col[8*1]);
274
        MUL16(b2, W5, col[8*1]);
275
        MUL16(b3, W7, col[8*1]);
276

    
277
        MAC16(b0, + W3, col[8*3]);
278
        MAC16(b1, - W7, col[8*3]);
279
        MAC16(b2, - W1, col[8*3]);
280
        MAC16(b3, - W5, col[8*3]);
281

    
282
        if(col[8*4]){
283
            a0 += + W4*col[8*4];
284
            a1 += - W4*col[8*4];
285
            a2 += - W4*col[8*4];
286
            a3 += + W4*col[8*4];
287
        }
288

    
289
        if (col[8*5]) {
290
            MAC16(b0, + W5, col[8*5]);
291
            MAC16(b1, - W1, col[8*5]);
292
            MAC16(b2, + W7, col[8*5]);
293
            MAC16(b3, + W3, col[8*5]);
294
        }
295

    
296
        if(col[8*6]){
297
            a0 += + W6*col[8*6];
298
            a1 += - W2*col[8*6];
299
            a2 += + W2*col[8*6];
300
            a3 += - W6*col[8*6];
301
        }
302

    
303
        if (col[8*7]) {
304
            MAC16(b0, + W7, col[8*7]);
305
            MAC16(b1, - W5, col[8*7]);
306
            MAC16(b2, + W3, col[8*7]);
307
            MAC16(b3, - W1, col[8*7]);
308
        }
309

    
310
        dest[0] = cm[dest[0] + ((a0 + b0) >> COL_SHIFT)];
311
        dest += line_size;
312
        dest[0] = cm[dest[0] + ((a1 + b1) >> COL_SHIFT)];
313
        dest += line_size;
314
        dest[0] = cm[dest[0] + ((a2 + b2) >> COL_SHIFT)];
315
        dest += line_size;
316
        dest[0] = cm[dest[0] + ((a3 + b3) >> COL_SHIFT)];
317
        dest += line_size;
318
        dest[0] = cm[dest[0] + ((a3 - b3) >> COL_SHIFT)];
319
        dest += line_size;
320
        dest[0] = cm[dest[0] + ((a2 - b2) >> COL_SHIFT)];
321
        dest += line_size;
322
        dest[0] = cm[dest[0] + ((a1 - b1) >> COL_SHIFT)];
323
        dest += line_size;
324
        dest[0] = cm[dest[0] + ((a0 - b0) >> COL_SHIFT)];
325
}
326

    
327
static inline void idctSparseCol (DCTELEM * col)
328
{
329
        int a0, a1, a2, a3, b0, b1, b2, b3;
330

    
331
        /* XXX: I did that only to give same values as previous code */
332
        a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
333
        a1 = a0;
334
        a2 = a0;
335
        a3 = a0;
336

    
337
        a0 +=  + W2*col[8*2];
338
        a1 +=  + W6*col[8*2];
339
        a2 +=  - W6*col[8*2];
340
        a3 +=  - W2*col[8*2];
341

    
342
        MUL16(b0, W1, col[8*1]);
343
        MUL16(b1, W3, col[8*1]);
344
        MUL16(b2, W5, col[8*1]);
345
        MUL16(b3, W7, col[8*1]);
346

    
347
        MAC16(b0, + W3, col[8*3]);
348
        MAC16(b1, - W7, col[8*3]);
349
        MAC16(b2, - W1, col[8*3]);
350
        MAC16(b3, - W5, col[8*3]);
351

    
352
        if(col[8*4]){
353
            a0 += + W4*col[8*4];
354
            a1 += - W4*col[8*4];
355
            a2 += - W4*col[8*4];
356
            a3 += + W4*col[8*4];
357
        }
358

    
359
        if (col[8*5]) {
360
            MAC16(b0, + W5, col[8*5]);
361
            MAC16(b1, - W1, col[8*5]);
362
            MAC16(b2, + W7, col[8*5]);
363
            MAC16(b3, + W3, col[8*5]);
364
        }
365

    
366
        if(col[8*6]){
367
            a0 += + W6*col[8*6];
368
            a1 += - W2*col[8*6];
369
            a2 += + W2*col[8*6];
370
            a3 += - W6*col[8*6];
371
        }
372

    
373
        if (col[8*7]) {
374
            MAC16(b0, + W7, col[8*7]);
375
            MAC16(b1, - W5, col[8*7]);
376
            MAC16(b2, + W3, col[8*7]);
377
            MAC16(b3, - W1, col[8*7]);
378
        }
379

    
380
        col[0 ] = ((a0 + b0) >> COL_SHIFT);
381
        col[8 ] = ((a1 + b1) >> COL_SHIFT);
382
        col[16] = ((a2 + b2) >> COL_SHIFT);
383
        col[24] = ((a3 + b3) >> COL_SHIFT);
384
        col[32] = ((a3 - b3) >> COL_SHIFT);
385
        col[40] = ((a2 - b2) >> COL_SHIFT);
386
        col[48] = ((a1 - b1) >> COL_SHIFT);
387
        col[56] = ((a0 - b0) >> COL_SHIFT);
388
}
389

    
390
void ff_simple_idct_put(uint8_t *dest, int line_size, DCTELEM *block)
391
{
392
    int i;
393
    for(i=0; i<8; i++)
394
        idctRowCondDC(block + i*8);
395

    
396
    for(i=0; i<8; i++)
397
        idctSparseColPut(dest + i, line_size, block + i);
398
}
399

    
400
void ff_simple_idct_add(uint8_t *dest, int line_size, DCTELEM *block)
401
{
402
    int i;
403
    for(i=0; i<8; i++)
404
        idctRowCondDC(block + i*8);
405

    
406
    for(i=0; i<8; i++)
407
        idctSparseColAdd(dest + i, line_size, block + i);
408
}
409

    
410
void ff_simple_idct(DCTELEM *block)
411
{
412
    int i;
413
    for(i=0; i<8; i++)
414
        idctRowCondDC(block + i*8);
415

    
416
    for(i=0; i<8; i++)
417
        idctSparseCol(block + i);
418
}
419

    
420
/* 2x4x8 idct */
421

    
422
#define CN_SHIFT 12
423
#define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5))
424
#define C1 C_FIX(0.6532814824)
425
#define C2 C_FIX(0.2705980501)
426

    
427
/* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
428
   and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
429
#define C_SHIFT (4+1+12)
430

    
431
static inline void idct4col_put(uint8_t *dest, int line_size, const DCTELEM *col)
432
{
433
    int c0, c1, c2, c3, a0, a1, a2, a3;
434
    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
435

    
436
    a0 = col[8*0];
437
    a1 = col[8*2];
438
    a2 = col[8*4];
439
    a3 = col[8*6];
440
    c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
441
    c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
442
    c1 = a1 * C1 + a3 * C2;
443
    c3 = a1 * C2 - a3 * C1;
444
    dest[0] = cm[(c0 + c1) >> C_SHIFT];
445
    dest += line_size;
446
    dest[0] = cm[(c2 + c3) >> C_SHIFT];
447
    dest += line_size;
448
    dest[0] = cm[(c2 - c3) >> C_SHIFT];
449
    dest += line_size;
450
    dest[0] = cm[(c0 - c1) >> C_SHIFT];
451
}
452

    
453
#define BF(k) \
454
{\
455
    int a0, a1;\
456
    a0 = ptr[k];\
457
    a1 = ptr[8 + k];\
458
    ptr[k] = a0 + a1;\
459
    ptr[8 + k] = a0 - a1;\
460
}
461

    
462
/* only used by DV codec. The input must be interlaced. 128 is added
463
   to the pixels before clamping to avoid systematic error
464
   (1024*sqrt(2)) offset would be needed otherwise. */
465
/* XXX: I think a 1.0/sqrt(2) normalization should be needed to
466
   compensate the extra butterfly stage - I don't have the full DV
467
   specification */
468
void ff_simple_idct248_put(uint8_t *dest, int line_size, DCTELEM *block)
469
{
470
    int i;
471
    DCTELEM *ptr;
472

    
473
    /* butterfly */
474
    ptr = block;
475
    for(i=0;i<4;i++) {
476
        BF(0);
477
        BF(1);
478
        BF(2);
479
        BF(3);
480
        BF(4);
481
        BF(5);
482
        BF(6);
483
        BF(7);
484
        ptr += 2 * 8;
485
    }
486

    
487
    /* IDCT8 on each line */
488
    for(i=0; i<8; i++) {
489
        idctRowCondDC(block + i*8);
490
    }
491

    
492
    /* IDCT4 and store */
493
    for(i=0;i<8;i++) {
494
        idct4col_put(dest + i, 2 * line_size, block + i);
495
        idct4col_put(dest + line_size + i, 2 * line_size, block + 8 + i);
496
    }
497
}
498

    
499
/* 8x4 & 4x8 WMV2 IDCT */
500
#undef CN_SHIFT
501
#undef C_SHIFT
502
#undef C_FIX
503
#undef C1
504
#undef C2
505
#define CN_SHIFT 12
506
#define C_FIX(x) ((int)((x) * 1.414213562 * (1 << CN_SHIFT) + 0.5))
507
#define C1 C_FIX(0.6532814824)
508
#define C2 C_FIX(0.2705980501)
509
#define C3 C_FIX(0.5)
510
#define C_SHIFT (4+1+12)
511
static inline void idct4col_add(uint8_t *dest, int line_size, const DCTELEM *col)
512
{
513
    int c0, c1, c2, c3, a0, a1, a2, a3;
514
    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
515

    
516
    a0 = col[8*0];
517
    a1 = col[8*1];
518
    a2 = col[8*2];
519
    a3 = col[8*3];
520
    c0 = (a0 + a2)*C3 + (1 << (C_SHIFT - 1));
521
    c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1));
522
    c1 = a1 * C1 + a3 * C2;
523
    c3 = a1 * C2 - a3 * C1;
524
    dest[0] = cm[dest[0] + ((c0 + c1) >> C_SHIFT)];
525
    dest += line_size;
526
    dest[0] = cm[dest[0] + ((c2 + c3) >> C_SHIFT)];
527
    dest += line_size;
528
    dest[0] = cm[dest[0] + ((c2 - c3) >> C_SHIFT)];
529
    dest += line_size;
530
    dest[0] = cm[dest[0] + ((c0 - c1) >> C_SHIFT)];
531
}
532

    
533
#define RN_SHIFT 15
534
#define R_FIX(x) ((int)((x) * 1.414213562 * (1 << RN_SHIFT) + 0.5))
535
#define R1 R_FIX(0.6532814824)
536
#define R2 R_FIX(0.2705980501)
537
#define R3 R_FIX(0.5)
538
#define R_SHIFT 11
539
static inline void idct4row(DCTELEM *row)
540
{
541
    int c0, c1, c2, c3, a0, a1, a2, a3;
542
    //const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
543

    
544
    a0 = row[0];
545
    a1 = row[1];
546
    a2 = row[2];
547
    a3 = row[3];
548
    c0 = (a0 + a2)*R3 + (1 << (R_SHIFT - 1));
549
    c2 = (a0 - a2)*R3 + (1 << (R_SHIFT - 1));
550
    c1 = a1 * R1 + a3 * R2;
551
    c3 = a1 * R2 - a3 * R1;
552
    row[0]= (c0 + c1) >> R_SHIFT;
553
    row[1]= (c2 + c3) >> R_SHIFT;
554
    row[2]= (c2 - c3) >> R_SHIFT;
555
    row[3]= (c0 - c1) >> R_SHIFT;
556
}
557

    
558
void ff_simple_idct84_add(uint8_t *dest, int line_size, DCTELEM *block)
559
{
560
    int i;
561

    
562
    /* IDCT8 on each line */
563
    for(i=0; i<4; i++) {
564
        idctRowCondDC(block + i*8);
565
    }
566

    
567
    /* IDCT4 and store */
568
    for(i=0;i<8;i++) {
569
        idct4col_add(dest + i, line_size, block + i);
570
    }
571
}
572

    
573
void ff_simple_idct48_add(uint8_t *dest, int line_size, DCTELEM *block)
574
{
575
    int i;
576

    
577
    /* IDCT4 on each line */
578
    for(i=0; i<8; i++) {
579
        idct4row(block + i*8);
580
    }
581

    
582
    /* IDCT8 and store */
583
    for(i=0; i<4; i++){
584
        idctSparseColAdd(dest + i, line_size, block + i);
585
    }
586
}
587

    
588
void ff_simple_idct44_add(uint8_t *dest, int line_size, DCTELEM *block)
589
{
590
    int i;
591

    
592
    /* IDCT4 on each line */
593
    for(i=0; i<4; i++) {
594
        idct4row(block + i*8);
595
    }
596

    
597
    /* IDCT4 and store */
598
    for(i=0; i<4; i++){
599
        idct4col_add(dest + i, line_size, block + i);
600
    }
601
}