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[deb_ffmpeg.git] / ffmpeg / libavcodec / simple_idct_template.c
1 /*
2 * Simple IDCT
3 *
4 * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * simpleidct in C.
26 */
27
28 /*
29 based upon some outcommented c code from mpeg2dec (idct_mmx.c
30 written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
31 */
32
33 #include "simple_idct.h"
34
35 #include "bit_depth_template.c"
36
37 #undef W1
38 #undef W2
39 #undef W3
40 #undef W4
41 #undef W5
42 #undef W6
43 #undef W7
44 #undef ROW_SHIFT
45 #undef COL_SHIFT
46 #undef DC_SHIFT
47 #undef MUL
48 #undef MAC
49
50 #if BIT_DEPTH == 8
51
52 #define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
53 #define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
54 #define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
55 #define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
56 #define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
57 #define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
58 #define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
59
60 #define ROW_SHIFT 11
61 #define COL_SHIFT 20
62 #define DC_SHIFT 3
63
64 #define MUL(a, b) MUL16(a, b)
65 #define MAC(a, b, c) MAC16(a, b, c)
66
67 #elif BIT_DEPTH == 10 || BIT_DEPTH == 12
68
69 #if BIT_DEPTH == 10
70 #define W1 (22725*4) // 90901
71 #define W2 (21407*4) // 85627
72 #define W3 (19265*4) // 77062
73 #define W4 (16384*4) // 65535
74 #define W5 (12873*4) // 51491
75 #define W6 ( 8867*4) // 35468
76 #define W7 ( 4520*4) // 18081
77
78 #define ROW_SHIFT 15
79 #define COL_SHIFT 20
80 #define DC_SHIFT 1
81 #else
82 #define W1 45451
83 #define W2 42813
84 #define W3 38531
85 #define W4 32767
86 #define W5 25746
87 #define W6 17734
88 #define W7 9041
89
90 #define ROW_SHIFT 16
91 #define COL_SHIFT 17
92 #define DC_SHIFT -1
93 #endif
94
95 #define MUL(a, b) ((a) * (b))
96 #define MAC(a, b, c) ((a) += (b) * (c))
97
98 #else
99
100 #error "Unsupported bitdepth"
101
102 #endif
103
104 static inline void FUNC(idctRowCondDC)(int16_t *row, int extra_shift)
105 {
106 int a0, a1, a2, a3, b0, b1, b2, b3;
107
108 #if HAVE_FAST_64BIT
109 #define ROW0_MASK (0xffffLL << 48 * HAVE_BIGENDIAN)
110 if (((((uint64_t *)row)[0] & ~ROW0_MASK) | ((uint64_t *)row)[1]) == 0) {
111 uint64_t temp;
112 if (DC_SHIFT - extra_shift >= 0) {
113 temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
114 } else {
115 temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
116 }
117 temp += temp * (1 << 16);
118 temp += temp * ((uint64_t) 1 << 32);
119 ((uint64_t *)row)[0] = temp;
120 ((uint64_t *)row)[1] = temp;
121 return;
122 }
123 #else
124 if (!(((uint32_t*)row)[1] |
125 ((uint32_t*)row)[2] |
126 ((uint32_t*)row)[3] |
127 row[1])) {
128 uint32_t temp;
129 if (DC_SHIFT - extra_shift >= 0) {
130 temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
131 } else {
132 temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
133 }
134 temp += temp * (1 << 16);
135 ((uint32_t*)row)[0]=((uint32_t*)row)[1] =
136 ((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp;
137 return;
138 }
139 #endif
140
141 a0 = (W4 * row[0]) + (1 << (ROW_SHIFT + extra_shift - 1));
142 a1 = a0;
143 a2 = a0;
144 a3 = a0;
145
146 a0 += W2 * row[2];
147 a1 += W6 * row[2];
148 a2 -= W6 * row[2];
149 a3 -= W2 * row[2];
150
151 b0 = MUL(W1, row[1]);
152 MAC(b0, W3, row[3]);
153 b1 = MUL(W3, row[1]);
154 MAC(b1, -W7, row[3]);
155 b2 = MUL(W5, row[1]);
156 MAC(b2, -W1, row[3]);
157 b3 = MUL(W7, row[1]);
158 MAC(b3, -W5, row[3]);
159
160 if (AV_RN64A(row + 4)) {
161 a0 += W4*row[4] + W6*row[6];
162 a1 += - W4*row[4] - W2*row[6];
163 a2 += - W4*row[4] + W2*row[6];
164 a3 += W4*row[4] - W6*row[6];
165
166 MAC(b0, W5, row[5]);
167 MAC(b0, W7, row[7]);
168
169 MAC(b1, -W1, row[5]);
170 MAC(b1, -W5, row[7]);
171
172 MAC(b2, W7, row[5]);
173 MAC(b2, W3, row[7]);
174
175 MAC(b3, W3, row[5]);
176 MAC(b3, -W1, row[7]);
177 }
178
179 row[0] = (a0 + b0) >> (ROW_SHIFT + extra_shift);
180 row[7] = (a0 - b0) >> (ROW_SHIFT + extra_shift);
181 row[1] = (a1 + b1) >> (ROW_SHIFT + extra_shift);
182 row[6] = (a1 - b1) >> (ROW_SHIFT + extra_shift);
183 row[2] = (a2 + b2) >> (ROW_SHIFT + extra_shift);
184 row[5] = (a2 - b2) >> (ROW_SHIFT + extra_shift);
185 row[3] = (a3 + b3) >> (ROW_SHIFT + extra_shift);
186 row[4] = (a3 - b3) >> (ROW_SHIFT + extra_shift);
187 }
188
189 #define IDCT_COLS do { \
190 a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); \
191 a1 = a0; \
192 a2 = a0; \
193 a3 = a0; \
194 \
195 a0 += W2*col[8*2]; \
196 a1 += W6*col[8*2]; \
197 a2 += -W6*col[8*2]; \
198 a3 += -W2*col[8*2]; \
199 \
200 b0 = MUL(W1, col[8*1]); \
201 b1 = MUL(W3, col[8*1]); \
202 b2 = MUL(W5, col[8*1]); \
203 b3 = MUL(W7, col[8*1]); \
204 \
205 MAC(b0, W3, col[8*3]); \
206 MAC(b1, -W7, col[8*3]); \
207 MAC(b2, -W1, col[8*3]); \
208 MAC(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 MAC(b0, W5, col[8*5]); \
219 MAC(b1, -W1, col[8*5]); \
220 MAC(b2, W7, col[8*5]); \
221 MAC(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 MAC(b0, W7, col[8*7]); \
233 MAC(b1, -W5, col[8*7]); \
234 MAC(b2, W3, col[8*7]); \
235 MAC(b3, -W1, col[8*7]); \
236 } \
237 } while (0)
238
239 static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size,
240 int16_t *col)
241 {
242 int a0, a1, a2, a3, b0, b1, b2, b3;
243
244 IDCT_COLS;
245
246 dest[0] = av_clip_pixel((a0 + b0) >> COL_SHIFT);
247 dest += line_size;
248 dest[0] = av_clip_pixel((a1 + b1) >> COL_SHIFT);
249 dest += line_size;
250 dest[0] = av_clip_pixel((a2 + b2) >> COL_SHIFT);
251 dest += line_size;
252 dest[0] = av_clip_pixel((a3 + b3) >> COL_SHIFT);
253 dest += line_size;
254 dest[0] = av_clip_pixel((a3 - b3) >> COL_SHIFT);
255 dest += line_size;
256 dest[0] = av_clip_pixel((a2 - b2) >> COL_SHIFT);
257 dest += line_size;
258 dest[0] = av_clip_pixel((a1 - b1) >> COL_SHIFT);
259 dest += line_size;
260 dest[0] = av_clip_pixel((a0 - b0) >> COL_SHIFT);
261 }
262
263 static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size,
264 int16_t *col)
265 {
266 int a0, a1, a2, a3, b0, b1, b2, b3;
267
268 IDCT_COLS;
269
270 dest[0] = av_clip_pixel(dest[0] + ((a0 + b0) >> COL_SHIFT));
271 dest += line_size;
272 dest[0] = av_clip_pixel(dest[0] + ((a1 + b1) >> COL_SHIFT));
273 dest += line_size;
274 dest[0] = av_clip_pixel(dest[0] + ((a2 + b2) >> COL_SHIFT));
275 dest += line_size;
276 dest[0] = av_clip_pixel(dest[0] + ((a3 + b3) >> COL_SHIFT));
277 dest += line_size;
278 dest[0] = av_clip_pixel(dest[0] + ((a3 - b3) >> COL_SHIFT));
279 dest += line_size;
280 dest[0] = av_clip_pixel(dest[0] + ((a2 - b2) >> COL_SHIFT));
281 dest += line_size;
282 dest[0] = av_clip_pixel(dest[0] + ((a1 - b1) >> COL_SHIFT));
283 dest += line_size;
284 dest[0] = av_clip_pixel(dest[0] + ((a0 - b0) >> COL_SHIFT));
285 }
286
287 static inline void FUNC(idctSparseCol)(int16_t *col)
288 {
289 int a0, a1, a2, a3, b0, b1, b2, b3;
290
291 IDCT_COLS;
292
293 col[0 ] = ((a0 + b0) >> COL_SHIFT);
294 col[8 ] = ((a1 + b1) >> COL_SHIFT);
295 col[16] = ((a2 + b2) >> COL_SHIFT);
296 col[24] = ((a3 + b3) >> COL_SHIFT);
297 col[32] = ((a3 - b3) >> COL_SHIFT);
298 col[40] = ((a2 - b2) >> COL_SHIFT);
299 col[48] = ((a1 - b1) >> COL_SHIFT);
300 col[56] = ((a0 - b0) >> COL_SHIFT);
301 }
302
303 void FUNC(ff_simple_idct_put)(uint8_t *dest_, int line_size, int16_t *block)
304 {
305 pixel *dest = (pixel *)dest_;
306 int i;
307
308 line_size /= sizeof(pixel);
309
310 for (i = 0; i < 8; i++)
311 FUNC(idctRowCondDC)(block + i*8, 0);
312
313 for (i = 0; i < 8; i++)
314 FUNC(idctSparseColPut)(dest + i, line_size, block + i);
315 }
316
317 void FUNC(ff_simple_idct_add)(uint8_t *dest_, int line_size, int16_t *block)
318 {
319 pixel *dest = (pixel *)dest_;
320 int i;
321
322 line_size /= sizeof(pixel);
323
324 for (i = 0; i < 8; i++)
325 FUNC(idctRowCondDC)(block + i*8, 0);
326
327 for (i = 0; i < 8; i++)
328 FUNC(idctSparseColAdd)(dest + i, line_size, block + i);
329 }
330
331 void FUNC(ff_simple_idct)(int16_t *block)
332 {
333 int i;
334
335 for (i = 0; i < 8; i++)
336 FUNC(idctRowCondDC)(block + i*8, 0);
337
338 for (i = 0; i < 8; i++)
339 FUNC(idctSparseCol)(block + i);
340 }
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