FFmpeg
h264chroma_mmi.c
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1 /*
2  * Loongson SIMD optimized h264chroma
3  *
4  * Copyright (c) 2015 Loongson Technology Corporation Limited
5  * Copyright (c) 2015 Zhou Xiaoyong <zhouxiaoyong@loongson.cn>
6  * Zhang Shuangshuang <zhangshuangshuang@ict.ac.cn>
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "h264chroma_mips.h"
26 #include "constants.h"
27 #include "libavutil/mips/mmiutils.h"
28 
29 void ff_put_h264_chroma_mc8_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
30  int h, int x, int y)
31 {
32  int A = 64, B, C, D, E;
33  double ftmp[12];
34  uint64_t tmp[1];
35 
36  if (!(x || y)) {
37  /* x=0, y=0, A=64 */
38  __asm__ volatile (
39  "1: \n\t"
40  MMI_ULDC1(%[ftmp0], %[src], 0x00)
41  PTR_ADDU "%[src], %[src], %[stride] \n\t"
42  MMI_ULDC1(%[ftmp1], %[src], 0x00)
43  PTR_ADDU "%[src], %[src], %[stride] \n\t"
44  MMI_ULDC1(%[ftmp2], %[src], 0x00)
45  PTR_ADDU "%[src], %[src], %[stride] \n\t"
46  MMI_ULDC1(%[ftmp3], %[src], 0x00)
47  PTR_ADDU "%[src], %[src], %[stride] \n\t"
48 
49  "addi %[h], %[h], -0x04 \n\t"
50 
51  MMI_SDC1(%[ftmp0], %[dst], 0x00)
52  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
53  MMI_SDC1(%[ftmp1], %[dst], 0x00)
54  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
55  MMI_SDC1(%[ftmp2], %[dst], 0x00)
56  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
57  MMI_SDC1(%[ftmp3], %[dst], 0x00)
58  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
59  "bnez %[h], 1b \n\t"
60  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
61  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
62  [dst]"+&r"(dst), [src]"+&r"(src),
63  [h]"+&r"(h)
64  : [stride]"r"((mips_reg)stride)
65  : "memory"
66  );
67  } else if (x && y) {
68  /* x!=0, y!=0 */
69  D = x * y;
70  B = (x << 3) - D;
71  C = (y << 3) - D;
72  A = 64 - D - B - C;
73 
74  __asm__ volatile (
75  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
76  "dli %[tmp0], 0x06 \n\t"
77  "pshufh %[A], %[A], %[ftmp0] \n\t"
78  "pshufh %[B], %[B], %[ftmp0] \n\t"
79  "mtc1 %[tmp0], %[ftmp9] \n\t"
80  "pshufh %[C], %[C], %[ftmp0] \n\t"
81  "pshufh %[D], %[D], %[ftmp0] \n\t"
82 
83  "1: \n\t"
84  MMI_ULDC1(%[ftmp1], %[src], 0x00)
85  MMI_ULDC1(%[ftmp2], %[src], 0x01)
86  PTR_ADDU "%[src], %[src], %[stride] \n\t"
87  MMI_ULDC1(%[ftmp3], %[src], 0x00)
88  MMI_ULDC1(%[ftmp4], %[src], 0x01)
89  PTR_ADDU "%[src], %[src], %[stride] \n\t"
90  MMI_ULDC1(%[ftmp10], %[src], 0x00)
91  MMI_ULDC1(%[ftmp11], %[src], 0x01)
92  "addi %[h], %[h], -0x02 \n\t"
93 
94  "punpcklbh %[ftmp5], %[ftmp1], %[ftmp0] \n\t"
95  "punpckhbh %[ftmp6], %[ftmp1], %[ftmp0] \n\t"
96  "punpcklbh %[ftmp7], %[ftmp2], %[ftmp0] \n\t"
97  "punpckhbh %[ftmp8], %[ftmp2], %[ftmp0] \n\t"
98  "pmullh %[ftmp5], %[ftmp5], %[A] \n\t"
99  "pmullh %[ftmp7], %[ftmp7], %[B] \n\t"
100  "paddh %[ftmp1], %[ftmp5], %[ftmp7] \n\t"
101  "pmullh %[ftmp6], %[ftmp6], %[A] \n\t"
102  "pmullh %[ftmp8], %[ftmp8], %[B] \n\t"
103  "paddh %[ftmp2], %[ftmp6], %[ftmp8] \n\t"
104  "punpcklbh %[ftmp5], %[ftmp3], %[ftmp0] \n\t"
105  "punpckhbh %[ftmp6], %[ftmp3], %[ftmp0] \n\t"
106  "punpcklbh %[ftmp7], %[ftmp4], %[ftmp0] \n\t"
107  "punpckhbh %[ftmp8], %[ftmp4], %[ftmp0] \n\t"
108  "pmullh %[ftmp5], %[ftmp5], %[C] \n\t"
109  "pmullh %[ftmp7], %[ftmp7], %[D] \n\t"
110  "paddh %[ftmp5], %[ftmp5], %[ftmp7] \n\t"
111  "pmullh %[ftmp6], %[ftmp6], %[C] \n\t"
112  "pmullh %[ftmp8], %[ftmp8], %[D] \n\t"
113  "paddh %[ftmp6], %[ftmp6], %[ftmp8] \n\t"
114  "paddh %[ftmp1], %[ftmp1], %[ftmp5] \n\t"
115  "paddh %[ftmp2], %[ftmp2], %[ftmp6] \n\t"
116  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
117  "paddh %[ftmp2], %[ftmp2], %[ff_pw_32] \n\t"
118  "psrlh %[ftmp1], %[ftmp1], %[ftmp9] \n\t"
119  "psrlh %[ftmp2], %[ftmp2], %[ftmp9] \n\t"
120  "packushb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
121 
122  "punpcklbh %[ftmp5], %[ftmp3], %[ftmp0] \n\t"
123  "punpckhbh %[ftmp6], %[ftmp3], %[ftmp0] \n\t"
124  "punpcklbh %[ftmp7], %[ftmp4], %[ftmp0] \n\t"
125  "punpckhbh %[ftmp8], %[ftmp4], %[ftmp0] \n\t"
126  "pmullh %[ftmp5], %[ftmp5], %[A] \n\t"
127  "pmullh %[ftmp7], %[ftmp7], %[B] \n\t"
128  "paddh %[ftmp3], %[ftmp5], %[ftmp7] \n\t"
129  "pmullh %[ftmp6], %[ftmp6], %[A] \n\t"
130  "pmullh %[ftmp8], %[ftmp8], %[B] \n\t"
131  "paddh %[ftmp4], %[ftmp6], %[ftmp8] \n\t"
132  "punpcklbh %[ftmp5], %[ftmp10], %[ftmp0] \n\t"
133  "punpckhbh %[ftmp6], %[ftmp10], %[ftmp0] \n\t"
134  "punpcklbh %[ftmp7], %[ftmp11], %[ftmp0] \n\t"
135  "punpckhbh %[ftmp8], %[ftmp11], %[ftmp0] \n\t"
136  "pmullh %[ftmp5], %[ftmp5], %[C] \n\t"
137  "pmullh %[ftmp7], %[ftmp7], %[D] \n\t"
138  "paddh %[ftmp5], %[ftmp5], %[ftmp7] \n\t"
139  "pmullh %[ftmp6], %[ftmp6], %[C] \n\t"
140  "pmullh %[ftmp8], %[ftmp8], %[D] \n\t"
141  "paddh %[ftmp6], %[ftmp6], %[ftmp8] \n\t"
142  "paddh %[ftmp3], %[ftmp3], %[ftmp5] \n\t"
143  "paddh %[ftmp4], %[ftmp4], %[ftmp6] \n\t"
144  "paddh %[ftmp3], %[ftmp3], %[ff_pw_32] \n\t"
145  "paddh %[ftmp4], %[ftmp4], %[ff_pw_32] \n\t"
146  "psrlh %[ftmp3], %[ftmp3], %[ftmp9] \n\t"
147  "psrlh %[ftmp4], %[ftmp4], %[ftmp9] \n\t"
148  "packushb %[ftmp3], %[ftmp3], %[ftmp4] \n\t"
149 
150  MMI_SDC1(%[ftmp1], %[dst], 0x00)
151  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
152  MMI_SDC1(%[ftmp3], %[dst], 0x00)
153  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
154  "bnez %[h], 1b \n\t"
155  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
156  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
157  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
158  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
159  [ftmp8]"=&f"(ftmp[8]), [ftmp9]"=&f"(ftmp[9]),
160  [ftmp10]"=&f"(ftmp[10]), [ftmp11]"=&f"(ftmp[11]),
161  [tmp0]"=&r"(tmp[0]),
162  [dst]"+&r"(dst), [src]"+&r"(src),
163  [h]"+&r"(h)
164  : [stride]"r"((mips_reg)stride),[ff_pw_32]"f"(ff_pw_32),
165  [A]"f"(A), [B]"f"(B),
166  [C]"f"(C), [D]"f"(D)
167  : "memory"
168  );
169  } else if (x) {
170  /* x!=0, y==0 */
171  E = x << 3;
172  A = 64 - E;
173 
174  __asm__ volatile (
175  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
176  "dli %[tmp0], 0x06 \n\t"
177  "pshufh %[A], %[A], %[ftmp0] \n\t"
178  "pshufh %[E], %[E], %[ftmp0] \n\t"
179  "mtc1 %[tmp0], %[ftmp7] \n\t"
180 
181  "1: \n\t"
182  MMI_ULDC1(%[ftmp1], %[src], 0x00)
183  MMI_ULDC1(%[ftmp2], %[src], 0x01)
184  "addi %[h], %[h], -0x01 \n\t"
185  PTR_ADDU "%[src], %[src], %[stride] \n\t"
186 
187  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
188  "punpckhbh %[ftmp4], %[ftmp1], %[ftmp0] \n\t"
189  "punpcklbh %[ftmp5], %[ftmp2], %[ftmp0] \n\t"
190  "punpckhbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
191  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
192  "pmullh %[ftmp5], %[ftmp5], %[E] \n\t"
193  "paddh %[ftmp1], %[ftmp3], %[ftmp5] \n\t"
194  "pmullh %[ftmp4], %[ftmp4], %[A] \n\t"
195  "pmullh %[ftmp6], %[ftmp6], %[E] \n\t"
196  "paddh %[ftmp2], %[ftmp4], %[ftmp6] \n\t"
197 
198  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
199  "paddh %[ftmp2], %[ftmp2], %[ff_pw_32] \n\t"
200  "psrlh %[ftmp1], %[ftmp1], %[ftmp7] \n\t"
201  "psrlh %[ftmp2], %[ftmp2], %[ftmp7] \n\t"
202  "packushb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
203  MMI_SDC1(%[ftmp1], %[dst], 0x00)
204  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
205  "bnez %[h], 1b \n\t"
206  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
207  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
208  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
209  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
210  [tmp0]"=&r"(tmp[0]),
211  [dst]"+&r"(dst), [src]"+&r"(src),
212  [h]"+&r"(h)
213  : [stride]"r"((mips_reg)stride),
214  [ff_pw_32]"f"(ff_pw_32),
215  [A]"f"(A), [E]"f"(E)
216  : "memory"
217  );
218  } else {
219  /* x==0, y!=0 */
220  E = y << 3;
221  A = 64 - E;
222 
223  __asm__ volatile (
224  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
225  "dli %[tmp0], 0x06 \n\t"
226  "pshufh %[A], %[A], %[ftmp0] \n\t"
227  "pshufh %[E], %[E], %[ftmp0] \n\t"
228  "mtc1 %[tmp0], %[ftmp7] \n\t"
229 
230  "1: \n\t"
231  MMI_ULDC1(%[ftmp1], %[src], 0x00)
232  PTR_ADDU "%[src], %[src], %[stride] \n\t"
233  MMI_ULDC1(%[ftmp2], %[src], 0x00)
234  PTR_ADDU "%[src], %[src], %[stride] \n\t"
235  MMI_ULDC1(%[ftmp8], %[src], 0x00)
236  "addi %[h], %[h], -0x02 \n\t"
237 
238  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
239  "punpckhbh %[ftmp4], %[ftmp1], %[ftmp0] \n\t"
240  "punpcklbh %[ftmp5], %[ftmp2], %[ftmp0] \n\t"
241  "punpckhbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
242  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
243  "pmullh %[ftmp5], %[ftmp5], %[E] \n\t"
244  "paddh %[ftmp3], %[ftmp3], %[ftmp5] \n\t"
245  "pmullh %[ftmp4], %[ftmp4], %[A] \n\t"
246  "pmullh %[ftmp6], %[ftmp6], %[E] \n\t"
247  "paddh %[ftmp4], %[ftmp4], %[ftmp6] \n\t"
248  "paddh %[ftmp3], %[ftmp3], %[ff_pw_32] \n\t"
249  "paddh %[ftmp4], %[ftmp4], %[ff_pw_32] \n\t"
250  "psrlh %[ftmp3], %[ftmp3], %[ftmp7] \n\t"
251  "psrlh %[ftmp4], %[ftmp4], %[ftmp7] \n\t"
252  "packushb %[ftmp1], %[ftmp3], %[ftmp4] \n\t"
253 
254  "punpcklbh %[ftmp3], %[ftmp2], %[ftmp0] \n\t"
255  "punpckhbh %[ftmp4], %[ftmp2], %[ftmp0] \n\t"
256  "punpcklbh %[ftmp5], %[ftmp8], %[ftmp0] \n\t"
257  "punpckhbh %[ftmp6], %[ftmp8], %[ftmp0] \n\t"
258  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
259  "pmullh %[ftmp5], %[ftmp5], %[E] \n\t"
260  "paddh %[ftmp3], %[ftmp3], %[ftmp5] \n\t"
261  "pmullh %[ftmp4], %[ftmp4], %[A] \n\t"
262  "pmullh %[ftmp6], %[ftmp6], %[E] \n\t"
263  "paddh %[ftmp4], %[ftmp4], %[ftmp6] \n\t"
264  "paddh %[ftmp3], %[ftmp3], %[ff_pw_32] \n\t"
265  "paddh %[ftmp4], %[ftmp4], %[ff_pw_32] \n\t"
266  "psrlh %[ftmp3], %[ftmp3], %[ftmp7] \n\t"
267  "psrlh %[ftmp4], %[ftmp4], %[ftmp7] \n\t"
268  "packushb %[ftmp2], %[ftmp3], %[ftmp4] \n\t"
269 
270  MMI_SDC1(%[ftmp1], %[dst], 0x00)
271  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
272  MMI_SDC1(%[ftmp2], %[dst], 0x00)
273  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
274  "bnez %[h], 1b \n\t"
275  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
276  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
277  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
278  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
279  [ftmp8]"=&f"(ftmp[8]), [tmp0]"=&r"(tmp[0]),
280  [dst]"+&r"(dst), [src]"+&r"(src),
281  [h]"+&r"(h)
282  : [stride]"r"((mips_reg)stride),
283  [ff_pw_32]"f"(ff_pw_32),
284  [A]"f"(A), [E]"f"(E)
285  : "memory"
286  );
287  }
288 }
289 
290 void ff_avg_h264_chroma_mc8_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
291  int h, int x, int y)
292 {
293  int A = 64, B, C, D, E;
294  double ftmp[10];
295  uint64_t tmp[1];
296 
297  if(!(x || y)){
298  /* x=0, y=0, A=64 */
299  __asm__ volatile (
300  "1: \n\t"
301  MMI_ULDC1(%[ftmp0], %[src], 0x00)
302  PTR_ADDU "%[src], %[src], %[stride] \n\t"
303  MMI_ULDC1(%[ftmp1], %[src], 0x00)
304  PTR_ADDU "%[src], %[src], %[stride] \n\t"
305  MMI_LDC1(%[ftmp2], %[dst], 0x00)
306  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
307  MMI_LDC1(%[ftmp3], %[dst], 0x00)
308  PTR_SUBU "%[dst], %[dst], %[stride] \n\t"
309  "pavgb %[ftmp0], %[ftmp0], %[ftmp2] \n\t"
310  "pavgb %[ftmp1], %[ftmp1], %[ftmp3] \n\t"
311  MMI_SDC1(%[ftmp0], %[dst], 0x00)
312  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
313  MMI_SDC1(%[ftmp1], %[dst], 0x00)
314  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
315  "addi %[h], %[h], -0x02 \n\t"
316  "bnez %[h], 1b \n\t"
317  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
318  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
319  [dst]"+&r"(dst), [src]"+&r"(src),
320  [h]"+&r"(h)
321  : [stride]"r"((mips_reg)stride)
322  : "memory"
323  );
324  } else if (x && y) {
325  /* x!=0, y!=0 */
326  D = x * y;
327  B = (x << 3) - D;
328  C = (y << 3) - D;
329  A = 64 - D - B - C;
330  __asm__ volatile (
331  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
332  "dli %[tmp0], 0x06 \n\t"
333  "pshufh %[A], %[A], %[ftmp0] \n\t"
334  "pshufh %[B], %[B], %[ftmp0] \n\t"
335  "mtc1 %[tmp0], %[ftmp9] \n\t"
336  "pshufh %[C], %[C], %[ftmp0] \n\t"
337  "pshufh %[D], %[D], %[ftmp0] \n\t"
338 
339  "1: \n\t"
340  MMI_ULDC1(%[ftmp1], %[src], 0x00)
341  MMI_ULDC1(%[ftmp2], %[src], 0x01)
342  PTR_ADDU "%[src], %[src], %[stride] \n\t"
343  MMI_ULDC1(%[ftmp3], %[src], 0x00)
344  MMI_ULDC1(%[ftmp4], %[src], 0x01)
345  "addi %[h], %[h], -0x01 \n\t"
346 
347  "punpcklbh %[ftmp5], %[ftmp1], %[ftmp0] \n\t"
348  "punpckhbh %[ftmp6], %[ftmp1], %[ftmp0] \n\t"
349  "punpcklbh %[ftmp7], %[ftmp2], %[ftmp0] \n\t"
350  "punpckhbh %[ftmp8], %[ftmp2], %[ftmp0] \n\t"
351  "pmullh %[ftmp5], %[ftmp5], %[A] \n\t"
352  "pmullh %[ftmp7], %[ftmp7], %[B] \n\t"
353  "paddh %[ftmp1], %[ftmp5], %[ftmp7] \n\t"
354  "pmullh %[ftmp6], %[ftmp6], %[A] \n\t"
355  "pmullh %[ftmp8], %[ftmp8], %[B] \n\t"
356  "paddh %[ftmp2], %[ftmp6], %[ftmp8] \n\t"
357 
358  "punpcklbh %[ftmp5], %[ftmp3], %[ftmp0] \n\t"
359  "punpckhbh %[ftmp6], %[ftmp3], %[ftmp0] \n\t"
360  "punpcklbh %[ftmp7], %[ftmp4], %[ftmp0] \n\t"
361  "punpckhbh %[ftmp8], %[ftmp4], %[ftmp0] \n\t"
362  "pmullh %[ftmp5], %[ftmp5], %[C] \n\t"
363  "pmullh %[ftmp7], %[ftmp7], %[D] \n\t"
364  "paddh %[ftmp3], %[ftmp5], %[ftmp7] \n\t"
365  "pmullh %[ftmp6], %[ftmp6], %[C] \n\t"
366  "pmullh %[ftmp8], %[ftmp8], %[D] \n\t"
367  "paddh %[ftmp4], %[ftmp6], %[ftmp8] \n\t"
368 
369  "paddh %[ftmp1], %[ftmp1], %[ftmp3] \n\t"
370  "paddh %[ftmp2], %[ftmp2], %[ftmp4] \n\t"
371  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
372  "paddh %[ftmp2], %[ftmp2], %[ff_pw_32] \n\t"
373  "psrlh %[ftmp1], %[ftmp1], %[ftmp9] \n\t"
374  "psrlh %[ftmp2], %[ftmp2], %[ftmp9] \n\t"
375  "packushb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
376  MMI_LDC1(%[ftmp2], %[dst], 0x00)
377  "pavgb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
378  MMI_SDC1(%[ftmp1], %[dst], 0x00)
379  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
380  "bnez %[h], 1b \n\t"
381  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
382  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
383  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
384  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
385  [ftmp8]"=&f"(ftmp[8]), [ftmp9]"=&f"(ftmp[9]),
386  [tmp0]"=&r"(tmp[0]),
387  [dst]"+&r"(dst), [src]"+&r"(src),
388  [h]"+&r"(h)
389  : [stride]"r"((mips_reg)stride),[ff_pw_32]"f"(ff_pw_32),
390  [A]"f"(A), [B]"f"(B),
391  [C]"f"(C), [D]"f"(D)
392  : "memory"
393  );
394  } else if (x) {
395  /* x!=0, y==0 */
396  E = x << 3;
397  A = 64 - E;
398  __asm__ volatile (
399  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
400  "dli %[tmp0], 0x06 \n\t"
401  "pshufh %[A], %[A], %[ftmp0] \n\t"
402  "pshufh %[E], %[E], %[ftmp0] \n\t"
403  "mtc1 %[tmp0], %[ftmp7] \n\t"
404 
405  "1: \n\t"
406  MMI_ULDC1(%[ftmp1], %[src], 0x00)
407  MMI_ULDC1(%[ftmp2], %[src], 0x01)
408  PTR_ADDU "%[src], %[src], %[stride] \n\t"
409  "addi %[h], %[h], -0x01 \n\t"
410 
411  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
412  "punpckhbh %[ftmp4], %[ftmp1], %[ftmp0] \n\t"
413  "punpcklbh %[ftmp5], %[ftmp2], %[ftmp0] \n\t"
414  "punpckhbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
415  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
416  "pmullh %[ftmp5], %[ftmp5], %[E] \n\t"
417  "paddh %[ftmp1], %[ftmp3], %[ftmp5] \n\t"
418  "pmullh %[ftmp4], %[ftmp4], %[A] \n\t"
419  "pmullh %[ftmp6], %[ftmp6], %[E] \n\t"
420  "paddh %[ftmp2], %[ftmp4], %[ftmp6] \n\t"
421 
422  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
423  "paddh %[ftmp2], %[ftmp2], %[ff_pw_32] \n\t"
424  "psrlh %[ftmp1], %[ftmp1], %[ftmp7] \n\t"
425  "psrlh %[ftmp2], %[ftmp2], %[ftmp7] \n\t"
426  "packushb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
427  MMI_LDC1(%[ftmp2], %[dst], 0x00)
428  "pavgb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
429  MMI_SDC1(%[ftmp1], %[dst], 0x00)
430  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
431  "bnez %[h], 1b \n\t"
432  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
433  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
434  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
435  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
436  [tmp0]"=&r"(tmp[0]),
437  [dst]"+&r"(dst), [src]"+&r"(src),
438  [h]"+&r"(h)
439  : [stride]"r"((mips_reg)stride),
440  [ff_pw_32]"f"(ff_pw_32),
441  [A]"f"(A), [E]"f"(E)
442  : "memory"
443  );
444  } else {
445  /* x==0, y!=0 */
446  E = y << 3;
447  A = 64 - E;
448  __asm__ volatile (
449  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
450  "dli %[tmp0], 0x06 \n\t"
451  "pshufh %[A], %[A], %[ftmp0] \n\t"
452  "pshufh %[E], %[E], %[ftmp0] \n\t"
453  "mtc1 %[tmp0], %[ftmp7] \n\t"
454 
455  "1: \n\t"
456  MMI_ULDC1(%[ftmp1], %[src], 0x00)
457  PTR_ADDU "%[src], %[src], %[stride] \n\t"
458  MMI_ULDC1(%[ftmp2], %[src], 0x00)
459  "addi %[h], %[h], -0x01 \n\t"
460 
461  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
462  "punpckhbh %[ftmp4], %[ftmp1], %[ftmp0] \n\t"
463  "punpcklbh %[ftmp5], %[ftmp2], %[ftmp0] \n\t"
464  "punpckhbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
465  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
466  "pmullh %[ftmp5], %[ftmp5], %[E] \n\t"
467  "paddh %[ftmp1], %[ftmp3], %[ftmp5] \n\t"
468  "pmullh %[ftmp4], %[ftmp4], %[A] \n\t"
469  "pmullh %[ftmp6], %[ftmp6], %[E] \n\t"
470  "paddh %[ftmp2], %[ftmp4], %[ftmp6] \n\t"
471 
472  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
473  "paddh %[ftmp2], %[ftmp2], %[ff_pw_32] \n\t"
474  "psrlh %[ftmp1], %[ftmp1], %[ftmp7] \n\t"
475  "psrlh %[ftmp2], %[ftmp2], %[ftmp7] \n\t"
476  "packushb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
477  MMI_LDC1(%[ftmp2], %[dst], 0x00)
478  "pavgb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
479  MMI_SDC1(%[ftmp1], %[dst], 0x00)
480  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
481  "bnez %[h], 1b \n\t"
482  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
483  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
484  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
485  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
486  [tmp0]"=&r"(tmp[0]),
487  [dst]"+&r"(dst), [src]"+&r"(src),
488  [h]"+&r"(h)
489  : [stride]"r"((mips_reg)stride),
490  [ff_pw_32]"f"(ff_pw_32),
491  [A]"f"(A), [E]"f"(E)
492  : "memory"
493  );
494  }
495 }
496 
497 void ff_put_h264_chroma_mc4_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
498  int h, int x, int y)
499 {
500  const int A = (8 - x) * (8 - y);
501  const int B = x * (8 - y);
502  const int C = (8 - x) * y;
503  const int D = x * y;
504  const int E = B + C;
505  double ftmp[8];
506  uint64_t tmp[1];
507  mips_reg addr[1];
508  DECLARE_VAR_LOW32;
509 
510  if (D) {
511  __asm__ volatile (
512  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
513  "dli %[tmp0], 0x06 \n\t"
514  "pshufh %[A], %[A], %[ftmp0] \n\t"
515  "pshufh %[B], %[B], %[ftmp0] \n\t"
516  "mtc1 %[tmp0], %[ftmp7] \n\t"
517  "pshufh %[C], %[C], %[ftmp0] \n\t"
518  "pshufh %[D], %[D], %[ftmp0] \n\t"
519 
520  "1: \n\t"
521  MMI_ULWC1(%[ftmp1], %[src], 0x00)
522  MMI_ULWC1(%[ftmp2], %[src], 0x01)
523  PTR_ADDU "%[src], %[src], %[stride] \n\t"
524  MMI_ULWC1(%[ftmp3], %[src], 0x00)
525  MMI_ULWC1(%[ftmp4], %[src], 0x01)
526 
527  "punpcklbh %[ftmp5], %[ftmp1], %[ftmp0] \n\t"
528  "punpcklbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
529  "pmullh %[ftmp5], %[ftmp5], %[A] \n\t"
530  "pmullh %[ftmp6], %[ftmp6], %[B] \n\t"
531  "paddh %[ftmp1], %[ftmp5], %[ftmp6] \n\t"
532  "punpcklbh %[ftmp5], %[ftmp3], %[ftmp0] \n\t"
533  "punpcklbh %[ftmp6], %[ftmp4], %[ftmp0] \n\t"
534  "pmullh %[ftmp5], %[ftmp5], %[C] \n\t"
535  "pmullh %[ftmp6], %[ftmp6], %[D] \n\t"
536  "paddh %[ftmp2], %[ftmp5], %[ftmp6] \n\t"
537  "paddh %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
538  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
539  "psrlh %[ftmp1], %[ftmp1], %[ftmp7] \n\t"
540  "packushb %[ftmp1], %[ftmp1], %[ftmp0] \n\t"
541 
542  "addi %[h], %[h], -0x01 \n\t"
543  MMI_SWC1(%[ftmp1], %[dst], 0x00)
544  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
545  "bnez %[h], 1b \n\t"
546  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
547  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
548  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
549  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
550  [tmp0]"=&r"(tmp[0]),
551  RESTRICT_ASM_LOW32
552  [dst]"+&r"(dst), [src]"+&r"(src),
553  [h]"+&r"(h)
554  : [stride]"r"((mips_reg)stride),[ff_pw_32]"f"(ff_pw_32),
555  [A]"f"(A), [B]"f"(B),
556  [C]"f"(C), [D]"f"(D)
557  : "memory"
558  );
559  } else if (E) {
560  const int step = C ? stride : 1;
561  __asm__ volatile (
562  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
563  "dli %[tmp0], 0x06 \n\t"
564  "pshufh %[A], %[A], %[ftmp0] \n\t"
565  "pshufh %[E], %[E], %[ftmp0] \n\t"
566  "mtc1 %[tmp0], %[ftmp5] \n\t"
567 
568  "1: \n\t"
569  MMI_ULWC1(%[ftmp1], %[src], 0x00)
570  PTR_ADDU "%[addr0], %[src], %[step] \n\t"
571  MMI_ULWC1(%[ftmp2], %[addr0], 0x00)
572  PTR_ADDU "%[src], %[src], %[stride] \n\t"
573  "addi %[h], %[h], -0x01 \n\t"
574  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
575  "punpcklbh %[ftmp4], %[ftmp2], %[ftmp0] \n\t"
576  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
577  "pmullh %[ftmp4], %[ftmp4], %[E] \n\t"
578  "paddh %[ftmp1], %[ftmp3], %[ftmp4] \n\t"
579  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
580  "psrlh %[ftmp1], %[ftmp1], %[ftmp5] \n\t"
581  "packushb %[ftmp1], %[ftmp1], %[ftmp0] \n\t"
582  MMI_SWC1(%[ftmp1], %[dst], 0x00)
583  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
584  "bnez %[h], 1b \n\t"
585  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
586  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
587  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
588  [tmp0]"=&r"(tmp[0]),
589  RESTRICT_ASM_LOW32
590  [addr0]"=&r"(addr[0]),
591  [dst]"+&r"(dst), [src]"+&r"(src),
592  [h]"+&r"(h)
593  : [stride]"r"((mips_reg)stride),[step]"r"((mips_reg)step),
594  [ff_pw_32]"f"(ff_pw_32),
595  [A]"f"(A), [E]"f"(E)
596  : "memory"
597  );
598  } else {
599  __asm__ volatile (
600  "1: \n\t"
601  MMI_ULWC1(%[ftmp0], %[src], 0x00)
602  PTR_ADDU "%[src], %[src], %[stride] \n\t"
603  MMI_ULWC1(%[ftmp1], %[src], 0x00)
604  PTR_ADDU "%[src], %[src], %[stride] \n\t"
605  "addi %[h], %[h], -0x02 \n\t"
606  MMI_SWC1(%[ftmp0], %[dst], 0x00)
607  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
608  MMI_SWC1(%[ftmp1], %[dst], 0x00)
609  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
610  "bnez %[h], 1b \n\t"
611  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
612  [dst]"+&r"(dst), [src]"+&r"(src),
613  RESTRICT_ASM_LOW32
614  [h]"+&r"(h)
615  : [stride]"r"((mips_reg)stride)
616  : "memory"
617  );
618  }
619 }
620 
621 void ff_avg_h264_chroma_mc4_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
622  int h, int x, int y)
623 {
624  const int A = (8 - x) *(8 - y);
625  const int B = x * (8 - y);
626  const int C = (8 - x) * y;
627  const int D = x * y;
628  const int E = B + C;
629  double ftmp[8];
630  uint64_t tmp[1];
631  mips_reg addr[1];
632  DECLARE_VAR_LOW32;
633 
634  if (D) {
635  __asm__ volatile (
636  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
637  "dli %[tmp0], 0x06 \n\t"
638  "pshufh %[A], %[A], %[ftmp0] \n\t"
639  "pshufh %[B], %[B], %[ftmp0] \n\t"
640  "mtc1 %[tmp0], %[ftmp7] \n\t"
641  "pshufh %[C], %[C], %[ftmp0] \n\t"
642  "pshufh %[D], %[D], %[ftmp0] \n\t"
643 
644  "1: \n\t"
645  MMI_ULWC1(%[ftmp1], %[src], 0x00)
646  MMI_ULWC1(%[ftmp2], %[src], 0x01)
647  PTR_ADDU "%[src], %[src], %[stride] \n\t"
648  MMI_ULWC1(%[ftmp3], %[src], 0x00)
649  MMI_ULWC1(%[ftmp4], %[src], 0x01)
650 
651  "punpcklbh %[ftmp5], %[ftmp1], %[ftmp0] \n\t"
652  "punpcklbh %[ftmp6], %[ftmp2], %[ftmp0] \n\t"
653  "pmullh %[ftmp5], %[ftmp5], %[A] \n\t"
654  "pmullh %[ftmp6], %[ftmp6], %[B] \n\t"
655  "paddh %[ftmp1], %[ftmp5], %[ftmp6] \n\t"
656  "punpcklbh %[ftmp5], %[ftmp3], %[ftmp0] \n\t"
657  "punpcklbh %[ftmp6], %[ftmp4], %[ftmp0] \n\t"
658  "pmullh %[ftmp5], %[ftmp5], %[C] \n\t"
659  "pmullh %[ftmp6], %[ftmp6], %[D] \n\t"
660  "paddh %[ftmp2], %[ftmp5], %[ftmp6] \n\t"
661  "paddh %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
662  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
663  "psrlh %[ftmp1], %[ftmp1], %[ftmp7] \n\t"
664  "packushb %[ftmp1], %[ftmp1], %[ftmp0] \n\t"
665  MMI_LWC1(%[ftmp2], %[dst], 0x00)
666  "pavgb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
667 
668  "addi %[h], %[h], -0x01 \n\t"
669  MMI_SWC1(%[ftmp1], %[dst], 0x00)
670  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
671  "bnez %[h], 1b \n\t"
672  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
673  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
674  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
675  [ftmp6]"=&f"(ftmp[6]), [ftmp7]"=&f"(ftmp[7]),
676  [tmp0]"=&r"(tmp[0]),
677  RESTRICT_ASM_LOW32
678  [dst]"+&r"(dst), [src]"+&r"(src),
679  [h]"+&r"(h)
680  : [stride]"r"((mips_reg)stride),[ff_pw_32]"f"(ff_pw_32),
681  [A]"f"(A), [B]"f"(B),
682  [C]"f"(C), [D]"f"(D)
683  : "memory"
684  );
685  } else if (E) {
686  const int step = C ? stride : 1;
687  __asm__ volatile (
688  "xor %[ftmp0], %[ftmp0], %[ftmp0] \n\t"
689  "dli %[tmp0], 0x06 \n\t"
690  "pshufh %[A], %[A], %[ftmp0] \n\t"
691  "pshufh %[E], %[E], %[ftmp0] \n\t"
692  "mtc1 %[tmp0], %[ftmp5] \n\t"
693 
694  "1: \n\t"
695  MMI_ULWC1(%[ftmp1], %[src], 0x00)
696  PTR_ADDU "%[addr0], %[src], %[step] \n\t"
697  MMI_ULWC1(%[ftmp2], %[addr0], 0x00)
698  PTR_ADDU "%[src], %[src], %[stride] \n\t"
699  "addi %[h], %[h], -0x01 \n\t"
700  "punpcklbh %[ftmp3], %[ftmp1], %[ftmp0] \n\t"
701  "punpcklbh %[ftmp4], %[ftmp2], %[ftmp0] \n\t"
702  "pmullh %[ftmp3], %[ftmp3], %[A] \n\t"
703  "pmullh %[ftmp4], %[ftmp4], %[E] \n\t"
704  "paddh %[ftmp1], %[ftmp3], %[ftmp4] \n\t"
705  "paddh %[ftmp1], %[ftmp1], %[ff_pw_32] \n\t"
706  "psrlh %[ftmp1], %[ftmp1], %[ftmp5] \n\t"
707  "packushb %[ftmp1], %[ftmp1], %[ftmp0] \n\t"
708  MMI_LWC1(%[ftmp2], %[dst], 0x00)
709  "pavgb %[ftmp1], %[ftmp1], %[ftmp2] \n\t"
710  MMI_SWC1(%[ftmp1], %[dst], 0x00)
711  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
712  "bnez %[h], 1b \n\t"
713  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
714  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
715  [ftmp4]"=&f"(ftmp[4]), [ftmp5]"=&f"(ftmp[5]),
716  [tmp0]"=&r"(tmp[0]),
717  RESTRICT_ASM_LOW32
718  [addr0]"=&r"(addr[0]),
719  [dst]"+&r"(dst), [src]"+&r"(src),
720  [h]"+&r"(h)
721  : [stride]"r"((mips_reg)stride),[step]"r"((mips_reg)step),
722  [ff_pw_32]"f"(ff_pw_32),
723  [A]"f"(A), [E]"f"(E)
724  : "memory"
725  );
726  } else {
727  __asm__ volatile (
728  "1: \n\t"
729  MMI_ULWC1(%[ftmp0], %[src], 0x00)
730  PTR_ADDU "%[src], %[src], %[stride] \n\t"
731  MMI_ULWC1(%[ftmp1], %[src], 0x00)
732  PTR_ADDU "%[src], %[src], %[stride] \n\t"
733  "addi %[h], %[h], -0x02 \n\t"
734  MMI_LWC1(%[ftmp2], %[dst], 0x00)
735  "pavgb %[ftmp0], %[ftmp0], %[ftmp2] \n\t"
736  MMI_SWC1(%[ftmp0], %[dst], 0x00)
737  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
738  MMI_LWC1(%[ftmp3], %[dst], 0x00)
739  "pavgb %[ftmp1], %[ftmp1], %[ftmp3] \n\t"
740  MMI_SWC1(%[ftmp1], %[dst], 0x00)
741  PTR_ADDU "%[dst], %[dst], %[stride] \n\t"
742  "bnez %[h], 1b \n\t"
743  : [ftmp0]"=&f"(ftmp[0]), [ftmp1]"=&f"(ftmp[1]),
744  [ftmp2]"=&f"(ftmp[2]), [ftmp3]"=&f"(ftmp[3]),
745  [dst]"+&r"(dst), [src]"+&r"(src),
746  RESTRICT_ASM_LOW32
747  [h]"+&r"(h)
748  : [stride]"r"((mips_reg)stride)
749  : "memory"
750  );
751  }
752 }
mips_reg
#define mips_reg
Definition: asmdefs.h:44
ff_put_h264_chroma_mc4_mmi
void ff_put_h264_chroma_mc4_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride, int h, int x, int y)
Definition: h264chroma_mmi.c:497
h
h
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const uint64_t ff_pw_32
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#define A(x)
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#define B
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#define E
Definition: avdct.c:32
ff_avg_h264_chroma_mc4_mmi
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Definition: h264chroma_mmi.c:621
C
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
Definition: writing_filters.txt:20
h264chroma_mips.h
ff_avg_h264_chroma_mc8_mmi
void ff_avg_h264_chroma_mc8_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride, int h, int x, int y)
Definition: h264chroma_mmi.c:290
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GLint GLenum GLboolean GLsizei stride
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D
D(D(float, sse)
Definition: rematrix_init.c:28
PTR_ADDU
#define PTR_ADDU
Definition: asmdefs.h:47
ff_put_h264_chroma_mc8_mmi
void ff_put_h264_chroma_mc8_mmi(uint8_t *dst, uint8_t *src, ptrdiff_t stride, int h, int x, int y)
Definition: h264chroma_mmi.c:29
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#define stride
step
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
Definition: rate_distortion.txt:12
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static uint8_t tmp[11]
Definition: aes_ctr.c:26
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