FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/x86/mpegvideoenc_template.c
Date: 2025-07-12 22:17:06
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1 /*
2 * MPEG video MMX templates
3 *
4 * Copyright (c) 2002 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 #include <stdint.h>
24
25 #include "libavutil/internal.h"
26 #include "libavutil/mem_internal.h"
27 #include "libavutil/x86/asm.h"
28 #include "libavcodec/mathops.h"
29 #include "libavcodec/mpegutils.h"
30 #include "libavcodec/mpegvideoenc.h"
31 #include "fdct.h"
32
33 #undef SPREADW
34 #undef PMAXW
35 #undef PMAX
36 #undef SAVE_SIGN
37 #undef RESTORE_SIGN
38
39 #define SPREADW(a) \
40 "pshuflw $0, "a", "a" \n\t"\
41 "punpcklwd "a", "a" \n\t"
42 #define PMAX(a,b) \
43 "movhlps "a", "b" \n\t"\
44 "pmaxsw "b", "a" \n\t"\
45 "pshuflw $0x0E, "a", "b" \n\t"\
46 "pmaxsw "b", "a" \n\t"\
47 "pshuflw $0x01, "a", "b" \n\t"\
48 "pmaxsw "b", "a" \n\t"
49
50 #if COMPILE_TEMPLATE_SSSE3
51 #define SAVE_SIGN(a,b) \
52 "movdqa "b", "a" \n\t"\
53 "pabsw "b", "b" \n\t"
54 #define RESTORE_SIGN(a,b) \
55 "psignw "a", "b" \n\t"
56 #else
57 #define SAVE_SIGN(a,b) \
58 "pxor "a", "a" \n\t"\
59 "pcmpgtw "b", "a" \n\t" /* block[i] <= 0 ? 0xFF : 0x00 */\
60 "pxor "a", "b" \n\t"\
61 "psubw "a", "b" \n\t" /* ABS(block[i]) */
62 #define RESTORE_SIGN(a,b) \
63 "pxor "a", "b" \n\t"\
64 "psubw "a", "b" \n\t" // out=((ABS(block[i])*qmat[0] - bias[0]*qmat[0])>>16)*sign(block[i])
65 #endif
66
67 static int RENAME(dct_quantize)(MPVEncContext *const s,
68 int16_t *block, int n,
69 int qscale, int *overflow)
70 {
71 x86_reg last_non_zero_p1;
72 int level=0, q; //=0 is because gcc says uninitialized ...
73 const uint16_t *qmat, *bias;
74 LOCAL_ALIGNED_16(int16_t, temp_block, [64]);
75
76 //s->fdct (block);
77 ff_fdct_sse2(block); // cannot be anything else ...
78
79 if(s->dct_error_sum)
80 s->denoise_dct(s, block);
81
82 if (s->c.mb_intra) {
83 int dummy;
84 if (n < 4){
85 q = s->c.y_dc_scale;
86 bias = s->q_intra_matrix16[qscale][1];
87 qmat = s->q_intra_matrix16[qscale][0];
88 }else{
89 q = s->c.c_dc_scale;
90 bias = s->q_chroma_intra_matrix16[qscale][1];
91 qmat = s->q_chroma_intra_matrix16[qscale][0];
92 }
93 /* note: block[0] is assumed to be positive */
94 if (!s->c.h263_aic) {
95 __asm__ volatile (
96 "mul %%ecx \n\t"
97 : "=d" (level), "=a"(dummy)
98 : "a" ((block[0]>>2) + q), "c" (ff_inverse[q<<1])
99 );
100 } else
101 /* For AIC we skip quant/dequant of INTRADC */
102 level = (block[0] + 4)>>3;
103
104 block[0]=0; //avoid fake overflow
105 // temp_block[0] = (block[0] + (q >> 1)) / q;
106 last_non_zero_p1 = 1;
107 } else {
108 last_non_zero_p1 = 0;
109 bias = s->q_inter_matrix16[qscale][1];
110 qmat = s->q_inter_matrix16[qscale][0];
111 }
112
113 if ((s->c.out_format == FMT_H263 || s->c.out_format == FMT_H261) && !s->mpeg_quant) {
114 __asm__ volatile(
115 "movd %%"FF_REG_a", %%xmm3 \n\t" // last_non_zero_p1
116 SPREADW("%%xmm3")
117 "pxor %%xmm7, %%xmm7 \n\t" // 0
118 "pxor %%xmm4, %%xmm4 \n\t" // 0
119 "movdqa (%2), %%xmm5 \n\t" // qmat[0]
120 "pxor %%xmm6, %%xmm6 \n\t"
121 "psubw (%3), %%xmm6 \n\t" // -bias[0]
122 "mov $-128, %%"FF_REG_a" \n\t"
123 ".p2align 4 \n\t"
124 "1: \n\t"
125 "movdqa (%1, %%"FF_REG_a"), %%xmm0 \n\t" // block[i]
126 SAVE_SIGN("%%xmm1", "%%xmm0") // ABS(block[i])
127 "psubusw %%xmm6, %%xmm0 \n\t" // ABS(block[i]) + bias[0]
128 "pmulhw %%xmm5, %%xmm0 \n\t" // (ABS(block[i])*qmat[0] - bias[0]*qmat[0])>>16
129 "por %%xmm0, %%xmm4 \n\t"
130 RESTORE_SIGN("%%xmm1", "%%xmm0") // out=((ABS(block[i])*qmat[0] - bias[0]*qmat[0])>>16)*sign(block[i])
131 "movdqa %%xmm0, (%5, %%"FF_REG_a") \n\t"
132 "pcmpeqw %%xmm7, %%xmm0 \n\t" // out==0 ? 0xFF : 0x00
133 "movdqa (%4, %%"FF_REG_a"), %%xmm1 \n\t"
134 "movdqa %%xmm7, (%1, %%"FF_REG_a") \n\t" // 0
135 "pandn %%xmm1, %%xmm0 \n\t"
136 "pmaxsw %%xmm0, %%xmm3 \n\t"
137 "add $16, %%"FF_REG_a" \n\t"
138 " js 1b \n\t"
139 PMAX("%%xmm3", "%%xmm0")
140 "movd %%xmm3, %%"FF_REG_a" \n\t"
141 "movzbl %%al, %%eax \n\t" // last_non_zero_p1
142 : "+a" (last_non_zero_p1)
143 : "r" (block+64), "r" (qmat), "r" (bias),
144 "r" (inv_zigzag_direct16 + 64), "r" (temp_block + 64)
145 XMM_CLOBBERS_ONLY("%xmm0", "%xmm1", "%xmm2", "%xmm3",
146 "%xmm4", "%xmm5", "%xmm6", "%xmm7")
147 );
148 }else{ // FMT_H263
149 __asm__ volatile(
150 "movd %%"FF_REG_a", %%xmm3 \n\t" // last_non_zero_p1
151 SPREADW("%%xmm3")
152 "pxor %%xmm7, %%xmm7 \n\t" // 0
153 "pxor %%xmm4, %%xmm4 \n\t" // 0
154 "mov $-128, %%"FF_REG_a" \n\t"
155 ".p2align 4 \n\t"
156 "1: \n\t"
157 "movdqa (%1, %%"FF_REG_a"), %%xmm0 \n\t" // block[i]
158 SAVE_SIGN("%%xmm1", "%%xmm0") // ABS(block[i])
159 "movdqa (%3, %%"FF_REG_a"), %%xmm6 \n\t" // bias[0]
160 "paddusw %%xmm6, %%xmm0 \n\t" // ABS(block[i]) + bias[0]
161 "movdqa (%2, %%"FF_REG_a"), %%xmm5 \n\t" // qmat[i]
162 "pmulhw %%xmm5, %%xmm0 \n\t" // (ABS(block[i])*qmat[0] + bias[0]*qmat[0])>>16
163 "por %%xmm0, %%xmm4 \n\t"
164 RESTORE_SIGN("%%xmm1", "%%xmm0") // out=((ABS(block[i])*qmat[0] - bias[0]*qmat[0])>>16)*sign(block[i])
165 "movdqa %%xmm0, (%5, %%"FF_REG_a") \n\t"
166 "pcmpeqw %%xmm7, %%xmm0 \n\t" // out==0 ? 0xFF : 0x00
167 "movdqa (%4, %%"FF_REG_a"), %%xmm1 \n\t"
168 "movdqa %%xmm7, (%1, %%"FF_REG_a") \n\t" // 0
169 "pandn %%xmm1, %%xmm0 \n\t"
170 "pmaxsw %%xmm0, %%xmm3 \n\t"
171 "add $16, %%"FF_REG_a" \n\t"
172 " js 1b \n\t"
173 PMAX("%%xmm3", "%%xmm0")
174 "movd %%xmm3, %%"FF_REG_a" \n\t"
175 "movzbl %%al, %%eax \n\t" // last_non_zero_p1
176 : "+a" (last_non_zero_p1)
177 : "r" (block+64), "r" (qmat+64), "r" (bias+64),
178 "r" (inv_zigzag_direct16 + 64), "r" (temp_block + 64)
179 XMM_CLOBBERS_ONLY("%xmm0", "%xmm1", "%xmm2", "%xmm3",
180 "%xmm4", "%xmm5", "%xmm6", "%xmm7")
181 );
182 }
183 __asm__ volatile(
184 "movd %1, %%xmm1 \n\t" // max_qcoeff
185 SPREADW("%%xmm1")
186 "psubusw %%xmm1, %%xmm4 \n\t"
187 "packuswb %%xmm4, %%xmm4 \n\t"
188 "packsswb %%xmm4, %%xmm4 \n\t"
189 "movd %%xmm4, %0 \n\t" // *overflow
190 : "=g" (*overflow)
191 : "g" (s->max_qcoeff)
192 );
193
194 block[0] = s->c.mb_intra ? level : temp_block[0];
195
196 av_assert2(ARCH_X86_32 || s->c.idsp.perm_type != FF_IDCT_PERM_SIMPLE);
197 if (ARCH_X86_32 && s->c.idsp.perm_type == FF_IDCT_PERM_SIMPLE) {
198 if(last_non_zero_p1 <= 1) goto end;
199 block[0x08] = temp_block[0x01]; block[0x10] = temp_block[0x08];
200 block[0x20] = temp_block[0x10];
201 if(last_non_zero_p1 <= 4) goto end;
202 block[0x18] = temp_block[0x09]; block[0x04] = temp_block[0x02];
203 block[0x09] = temp_block[0x03];
204 if(last_non_zero_p1 <= 7) goto end;
205 block[0x14] = temp_block[0x0A]; block[0x28] = temp_block[0x11];
206 block[0x12] = temp_block[0x18]; block[0x02] = temp_block[0x20];
207 if(last_non_zero_p1 <= 11) goto end;
208 block[0x1A] = temp_block[0x19]; block[0x24] = temp_block[0x12];
209 block[0x19] = temp_block[0x0B]; block[0x01] = temp_block[0x04];
210 block[0x0C] = temp_block[0x05];
211 if(last_non_zero_p1 <= 16) goto end;
212 block[0x11] = temp_block[0x0C]; block[0x29] = temp_block[0x13];
213 block[0x16] = temp_block[0x1A]; block[0x0A] = temp_block[0x21];
214 block[0x30] = temp_block[0x28]; block[0x22] = temp_block[0x30];
215 block[0x38] = temp_block[0x29]; block[0x06] = temp_block[0x22];
216 if(last_non_zero_p1 <= 24) goto end;
217 block[0x1B] = temp_block[0x1B]; block[0x21] = temp_block[0x14];
218 block[0x1C] = temp_block[0x0D]; block[0x05] = temp_block[0x06];
219 block[0x0D] = temp_block[0x07]; block[0x15] = temp_block[0x0E];
220 block[0x2C] = temp_block[0x15]; block[0x13] = temp_block[0x1C];
221 if(last_non_zero_p1 <= 32) goto end;
222 block[0x0B] = temp_block[0x23]; block[0x34] = temp_block[0x2A];
223 block[0x2A] = temp_block[0x31]; block[0x32] = temp_block[0x38];
224 block[0x3A] = temp_block[0x39]; block[0x26] = temp_block[0x32];
225 block[0x39] = temp_block[0x2B]; block[0x03] = temp_block[0x24];
226 if(last_non_zero_p1 <= 40) goto end;
227 block[0x1E] = temp_block[0x1D]; block[0x25] = temp_block[0x16];
228 block[0x1D] = temp_block[0x0F]; block[0x2D] = temp_block[0x17];
229 block[0x17] = temp_block[0x1E]; block[0x0E] = temp_block[0x25];
230 block[0x31] = temp_block[0x2C]; block[0x2B] = temp_block[0x33];
231 if(last_non_zero_p1 <= 48) goto end;
232 block[0x36] = temp_block[0x3A]; block[0x3B] = temp_block[0x3B];
233 block[0x23] = temp_block[0x34]; block[0x3C] = temp_block[0x2D];
234 block[0x07] = temp_block[0x26]; block[0x1F] = temp_block[0x1F];
235 block[0x0F] = temp_block[0x27]; block[0x35] = temp_block[0x2E];
236 if(last_non_zero_p1 <= 56) goto end;
237 block[0x2E] = temp_block[0x35]; block[0x33] = temp_block[0x3C];
238 block[0x3E] = temp_block[0x3D]; block[0x27] = temp_block[0x36];
239 block[0x3D] = temp_block[0x2F]; block[0x2F] = temp_block[0x37];
240 block[0x37] = temp_block[0x3E]; block[0x3F] = temp_block[0x3F];
241 } else if (s->c.idsp.perm_type == FF_IDCT_PERM_LIBMPEG2) {
242 if(last_non_zero_p1 <= 1) goto end;
243 block[0x04] = temp_block[0x01];
244 block[0x08] = temp_block[0x08]; block[0x10] = temp_block[0x10];
245 if(last_non_zero_p1 <= 4) goto end;
246 block[0x0C] = temp_block[0x09]; block[0x01] = temp_block[0x02];
247 block[0x05] = temp_block[0x03];
248 if(last_non_zero_p1 <= 7) goto end;
249 block[0x09] = temp_block[0x0A]; block[0x14] = temp_block[0x11];
250 block[0x18] = temp_block[0x18]; block[0x20] = temp_block[0x20];
251 if(last_non_zero_p1 <= 11) goto end;
252 block[0x1C] = temp_block[0x19];
253 block[0x11] = temp_block[0x12]; block[0x0D] = temp_block[0x0B];
254 block[0x02] = temp_block[0x04]; block[0x06] = temp_block[0x05];
255 if(last_non_zero_p1 <= 16) goto end;
256 block[0x0A] = temp_block[0x0C]; block[0x15] = temp_block[0x13];
257 block[0x19] = temp_block[0x1A]; block[0x24] = temp_block[0x21];
258 block[0x28] = temp_block[0x28]; block[0x30] = temp_block[0x30];
259 block[0x2C] = temp_block[0x29]; block[0x21] = temp_block[0x22];
260 if(last_non_zero_p1 <= 24) goto end;
261 block[0x1D] = temp_block[0x1B]; block[0x12] = temp_block[0x14];
262 block[0x0E] = temp_block[0x0D]; block[0x03] = temp_block[0x06];
263 block[0x07] = temp_block[0x07]; block[0x0B] = temp_block[0x0E];
264 block[0x16] = temp_block[0x15]; block[0x1A] = temp_block[0x1C];
265 if(last_non_zero_p1 <= 32) goto end;
266 block[0x25] = temp_block[0x23]; block[0x29] = temp_block[0x2A];
267 block[0x34] = temp_block[0x31]; block[0x38] = temp_block[0x38];
268 block[0x3C] = temp_block[0x39]; block[0x31] = temp_block[0x32];
269 block[0x2D] = temp_block[0x2B]; block[0x22] = temp_block[0x24];
270 if(last_non_zero_p1 <= 40) goto end;
271 block[0x1E] = temp_block[0x1D]; block[0x13] = temp_block[0x16];
272 block[0x0F] = temp_block[0x0F]; block[0x17] = temp_block[0x17];
273 block[0x1B] = temp_block[0x1E]; block[0x26] = temp_block[0x25];
274 block[0x2A] = temp_block[0x2C]; block[0x35] = temp_block[0x33];
275 if(last_non_zero_p1 <= 48) goto end;
276 block[0x39] = temp_block[0x3A]; block[0x3D] = temp_block[0x3B];
277 block[0x32] = temp_block[0x34]; block[0x2E] = temp_block[0x2D];
278 block[0x23] = temp_block[0x26]; block[0x1F] = temp_block[0x1F];
279 block[0x27] = temp_block[0x27]; block[0x2B] = temp_block[0x2E];
280 if(last_non_zero_p1 <= 56) goto end;
281 block[0x36] = temp_block[0x35]; block[0x3A] = temp_block[0x3C];
282 block[0x3E] = temp_block[0x3D]; block[0x33] = temp_block[0x36];
283 block[0x2F] = temp_block[0x2F]; block[0x37] = temp_block[0x37];
284 block[0x3B] = temp_block[0x3E]; block[0x3F] = temp_block[0x3F];
285 } else if (s->c.idsp.perm_type == FF_IDCT_PERM_NONE) {
286 if(last_non_zero_p1 <= 1) goto end;
287 block[0x01] = temp_block[0x01];
288 block[0x08] = temp_block[0x08]; block[0x10] = temp_block[0x10];
289 if(last_non_zero_p1 <= 4) goto end;
290 block[0x09] = temp_block[0x09]; block[0x02] = temp_block[0x02];
291 block[0x03] = temp_block[0x03];
292 if(last_non_zero_p1 <= 7) goto end;
293 block[0x0A] = temp_block[0x0A]; block[0x11] = temp_block[0x11];
294 block[0x18] = temp_block[0x18]; block[0x20] = temp_block[0x20];
295 if(last_non_zero_p1 <= 11) goto end;
296 block[0x19] = temp_block[0x19];
297 block[0x12] = temp_block[0x12]; block[0x0B] = temp_block[0x0B];
298 block[0x04] = temp_block[0x04]; block[0x05] = temp_block[0x05];
299 if(last_non_zero_p1 <= 16) goto end;
300 block[0x0C] = temp_block[0x0C]; block[0x13] = temp_block[0x13];
301 block[0x1A] = temp_block[0x1A]; block[0x21] = temp_block[0x21];
302 block[0x28] = temp_block[0x28]; block[0x30] = temp_block[0x30];
303 block[0x29] = temp_block[0x29]; block[0x22] = temp_block[0x22];
304 if(last_non_zero_p1 <= 24) goto end;
305 block[0x1B] = temp_block[0x1B]; block[0x14] = temp_block[0x14];
306 block[0x0D] = temp_block[0x0D]; block[0x06] = temp_block[0x06];
307 block[0x07] = temp_block[0x07]; block[0x0E] = temp_block[0x0E];
308 block[0x15] = temp_block[0x15]; block[0x1C] = temp_block[0x1C];
309 if(last_non_zero_p1 <= 32) goto end;
310 block[0x23] = temp_block[0x23]; block[0x2A] = temp_block[0x2A];
311 block[0x31] = temp_block[0x31]; block[0x38] = temp_block[0x38];
312 block[0x39] = temp_block[0x39]; block[0x32] = temp_block[0x32];
313 block[0x2B] = temp_block[0x2B]; block[0x24] = temp_block[0x24];
314 if(last_non_zero_p1 <= 40) goto end;
315 block[0x1D] = temp_block[0x1D]; block[0x16] = temp_block[0x16];
316 block[0x0F] = temp_block[0x0F]; block[0x17] = temp_block[0x17];
317 block[0x1E] = temp_block[0x1E]; block[0x25] = temp_block[0x25];
318 block[0x2C] = temp_block[0x2C]; block[0x33] = temp_block[0x33];
319 if(last_non_zero_p1 <= 48) goto end;
320 block[0x3A] = temp_block[0x3A]; block[0x3B] = temp_block[0x3B];
321 block[0x34] = temp_block[0x34]; block[0x2D] = temp_block[0x2D];
322 block[0x26] = temp_block[0x26]; block[0x1F] = temp_block[0x1F];
323 block[0x27] = temp_block[0x27]; block[0x2E] = temp_block[0x2E];
324 if(last_non_zero_p1 <= 56) goto end;
325 block[0x35] = temp_block[0x35]; block[0x3C] = temp_block[0x3C];
326 block[0x3D] = temp_block[0x3D]; block[0x36] = temp_block[0x36];
327 block[0x2F] = temp_block[0x2F]; block[0x37] = temp_block[0x37];
328 block[0x3E] = temp_block[0x3E]; block[0x3F] = temp_block[0x3F];
329 } else if (s->c.idsp.perm_type == FF_IDCT_PERM_TRANSPOSE) {
330 if(last_non_zero_p1 <= 1) goto end;
331 block[0x08] = temp_block[0x01];
332 block[0x01] = temp_block[0x08]; block[0x02] = temp_block[0x10];
333 if(last_non_zero_p1 <= 4) goto end;
334 block[0x09] = temp_block[0x09]; block[0x10] = temp_block[0x02];
335 block[0x18] = temp_block[0x03];
336 if(last_non_zero_p1 <= 7) goto end;
337 block[0x11] = temp_block[0x0A]; block[0x0A] = temp_block[0x11];
338 block[0x03] = temp_block[0x18]; block[0x04] = temp_block[0x20];
339 if(last_non_zero_p1 <= 11) goto end;
340 block[0x0B] = temp_block[0x19];
341 block[0x12] = temp_block[0x12]; block[0x19] = temp_block[0x0B];
342 block[0x20] = temp_block[0x04]; block[0x28] = temp_block[0x05];
343 if(last_non_zero_p1 <= 16) goto end;
344 block[0x21] = temp_block[0x0C]; block[0x1A] = temp_block[0x13];
345 block[0x13] = temp_block[0x1A]; block[0x0C] = temp_block[0x21];
346 block[0x05] = temp_block[0x28]; block[0x06] = temp_block[0x30];
347 block[0x0D] = temp_block[0x29]; block[0x14] = temp_block[0x22];
348 if(last_non_zero_p1 <= 24) goto end;
349 block[0x1B] = temp_block[0x1B]; block[0x22] = temp_block[0x14];
350 block[0x29] = temp_block[0x0D]; block[0x30] = temp_block[0x06];
351 block[0x38] = temp_block[0x07]; block[0x31] = temp_block[0x0E];
352 block[0x2A] = temp_block[0x15]; block[0x23] = temp_block[0x1C];
353 if(last_non_zero_p1 <= 32) goto end;
354 block[0x1C] = temp_block[0x23]; block[0x15] = temp_block[0x2A];
355 block[0x0E] = temp_block[0x31]; block[0x07] = temp_block[0x38];
356 block[0x0F] = temp_block[0x39]; block[0x16] = temp_block[0x32];
357 block[0x1D] = temp_block[0x2B]; block[0x24] = temp_block[0x24];
358 if(last_non_zero_p1 <= 40) goto end;
359 block[0x2B] = temp_block[0x1D]; block[0x32] = temp_block[0x16];
360 block[0x39] = temp_block[0x0F]; block[0x3A] = temp_block[0x17];
361 block[0x33] = temp_block[0x1E]; block[0x2C] = temp_block[0x25];
362 block[0x25] = temp_block[0x2C]; block[0x1E] = temp_block[0x33];
363 if(last_non_zero_p1 <= 48) goto end;
364 block[0x17] = temp_block[0x3A]; block[0x1F] = temp_block[0x3B];
365 block[0x26] = temp_block[0x34]; block[0x2D] = temp_block[0x2D];
366 block[0x34] = temp_block[0x26]; block[0x3B] = temp_block[0x1F];
367 block[0x3C] = temp_block[0x27]; block[0x35] = temp_block[0x2E];
368 if(last_non_zero_p1 <= 56) goto end;
369 block[0x2E] = temp_block[0x35]; block[0x27] = temp_block[0x3C];
370 block[0x2F] = temp_block[0x3D]; block[0x36] = temp_block[0x36];
371 block[0x3D] = temp_block[0x2F]; block[0x3E] = temp_block[0x37];
372 block[0x37] = temp_block[0x3E]; block[0x3F] = temp_block[0x3F];
373 } else {
374 av_log(s->c.avctx, AV_LOG_DEBUG, "s->c.idsp.perm_type: %d\n",
375 (int)s->c.idsp.perm_type);
376 av_assert0(s->c.idsp.perm_type == FF_IDCT_PERM_NONE ||
377 s->c.idsp.perm_type == FF_IDCT_PERM_LIBMPEG2 ||
378 s->c.idsp.perm_type == FF_IDCT_PERM_SIMPLE ||
379 s->c.idsp.perm_type == FF_IDCT_PERM_TRANSPOSE);
380 }
381 end:
382 return last_non_zero_p1 - 1;
383 }
384