git.sesse.net Git - vlc/blob - modules/codec/avcodec/copy.c

   1 /*****************************************************************************
   2  * copy.c: Fast YV12/NV12 copy
   3  *****************************************************************************
   4  * Copyright (C) 2010 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_common.h>
  29 #include <vlc_picture.h>
  30 #include <vlc_cpu.h>
  31 #include <assert.h>
  32
  33 #include "copy.h"
  34
  35 int CopyInitCache(copy_cache_t *cache, unsigned width)
  36 {
  37 #ifdef CAN_COMPILE_SSE2
  38     cache->size = __MAX((width + 0x0f) & ~ 0x0f, 4096);
  39     cache->buffer = vlc_memalign(16, cache->size);
  40     if (!cache->buffer)
  41         return VLC_EGENERIC;
  42 #else
  43     (void) cache; (void) width;
  44 #endif
  45     return VLC_SUCCESS;
  46 }
  47
  48 void CopyCleanCache(copy_cache_t *cache)
  49 {
  50 #ifdef CAN_COMPILE_SSE2
  51     vlc_free(cache->buffer);
  52     cache->buffer = NULL;
  53     cache->size   = 0;
  54 #else
  55     (void) cache;
  56 #endif
  57 }
  58
  59 #ifdef CAN_COMPILE_SSE2
  60 /* Copy 64 bytes from srcp to dstp loading data with the SSE>=2 instruction
  61  * load and storing data with the SSE>=2 instruction store.
  62  */
  63 #define COPY64(dstp, srcp, load, store) \
  64     asm volatile (                      \
  65         load "  0(%[src]), %%xmm1\n"    \
  66         load " 16(%[src]), %%xmm2\n"    \
  67         load " 32(%[src]), %%xmm3\n"    \
  68         load " 48(%[src]), %%xmm4\n"    \
  69         store " %%xmm1,    0(%[dst])\n" \
  70         store " %%xmm2,   16(%[dst])\n" \
  71         store " %%xmm3,   32(%[dst])\n" \
  72         store " %%xmm4,   48(%[dst])\n" \
  73         : : [dst]"r"(dstp), [src]"r"(srcp) : "memory", "xmm1", "xmm2", "xmm3", "xmm4")
  74
  75 #ifndef __SSE4_1__
  76 # undef vlc_CPU_SSE4_1
  77 # define vlc_CPU_SSE4_1() ((cpu & VLC_CPU_SSE4_1) != 0)
  78 #endif
  79
  80 #ifndef __SSSE3__
  81 # undef vlc_CPU_SSSE3
  82 # define vlc_CPU_SSSE3() ((cpu & VLC_CPU_SSSE3) != 0)
  83 #endif
  84
  85 #ifndef __SSE2__
  86 # undef vlc_CPU_SSE2
  87 # define vlc_CPU_SSE2() ((cpu & VLC_CPU_SSE2) != 0)
  88 #endif
  89
  90 /* Optimized copy from "Uncacheable Speculative Write Combining" memory
  91  * as used by some video surface.
  92  * XXX It is really efficient only when SSE4.1 is available.
  93  */
  94 VLC_SSE
  95 static void CopyFromUswc(uint8_t *dst, size_t dst_pitch,
  96                          const uint8_t *src, size_t src_pitch,
  97                          unsigned width, unsigned height,
  98                          unsigned cpu)
  99 {
 100     assert(((intptr_t)dst & 0x0f) == 0 && (dst_pitch & 0x0f) == 0);
 101
 102     asm volatile ("mfence");
 103
 104     for (unsigned y = 0; y < height; y++) {
 105         const unsigned unaligned = (-(uintptr_t)src) & 0x0f;
 106         unsigned x = 0;
 107
 108         for (; x < unaligned; x++)
 109             dst[x] = src[x];
 110
 111 #ifdef CAN_COMPILE_SSE4_1
 112         if (vlc_CPU_SSE4_1()) {
 113             if (!unaligned) {
 114                 for (; x+63 < width; x += 64)
 115                     COPY64(&dst[x], &src[x], "movntdqa", "movdqa");
 116             } else {
 117                 for (; x+63 < width; x += 64)
 118                     COPY64(&dst[x], &src[x], "movntdqa", "movdqu");
 119             }
 120         } else
 121 #endif
 122         {
 123             if (!unaligned) {
 124                 for (; x+63 < width; x += 64)
 125                     COPY64(&dst[x], &src[x], "movdqa", "movdqa");
 126             } else {
 127                 for (; x+63 < width; x += 64)
 128                     COPY64(&dst[x], &src[x], "movdqa", "movdqu");
 129             }
 130         }
 131
 132         for (; x < width; x++)
 133             dst[x] = src[x];
 134
 135         src += src_pitch;
 136         dst += dst_pitch;
 137     }
 138 }
 139
 140 VLC_SSE
 141 static void Copy2d(uint8_t *dst, size_t dst_pitch,
 142                    const uint8_t *src, size_t src_pitch,
 143                    unsigned width, unsigned height)
 144 {
 145     assert(((intptr_t)src & 0x0f) == 0 && (src_pitch & 0x0f) == 0);
 146
 147     asm volatile ("mfence");
 148
 149     for (unsigned y = 0; y < height; y++) {
 150         unsigned x = 0;
 151
 152         bool unaligned = ((intptr_t)dst & 0x0f) != 0;
 153         if (!unaligned) {
 154             for (; x+63 < width; x += 64)
 155                 COPY64(&dst[x], &src[x], "movdqa", "movntdq");
 156         } else {
 157             for (; x+63 < width; x += 64)
 158                 COPY64(&dst[x], &src[x], "movdqa", "movdqu");
 159         }
 160
 161         for (; x < width; x++)
 162             dst[x] = src[x];
 163
 164         src += src_pitch;
 165         dst += dst_pitch;
 166     }
 167 }
 168
 169 VLC_SSE
 170 static void SSE_SplitUV(uint8_t *dstu, size_t dstu_pitch,
 171                         uint8_t *dstv, size_t dstv_pitch,
 172                         const uint8_t *src, size_t src_pitch,
 173                         unsigned width, unsigned height, unsigned cpu)
 174 {
 175     const uint8_t shuffle[] = { 0, 2, 4, 6, 8, 10, 12, 14,
 176                                 1, 3, 5, 7, 9, 11, 13, 15 };
 177     const uint8_t mask[] = { 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00,
 178                              0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00 };
 179
 180     assert(((intptr_t)src & 0x0f) == 0 && (src_pitch & 0x0f) == 0);
 181
 182     asm volatile ("mfence");
 183
 184     for (unsigned y = 0; y < height; y++) {
 185         unsigned x = 0;
 186
 187 #define LOAD64 \
 188     "movdqa  0(%[src]), %%xmm0\n" \
 189     "movdqa 16(%[src]), %%xmm1\n" \
 190     "movdqa 32(%[src]), %%xmm2\n" \
 191     "movdqa 48(%[src]), %%xmm3\n"
 192
 193 #define STORE2X32 \
 194     "movq   %%xmm0,   0(%[dst1])\n" \
 195     "movq   %%xmm1,   8(%[dst1])\n" \
 196     "movhpd %%xmm0,   0(%[dst2])\n" \
 197     "movhpd %%xmm1,   8(%[dst2])\n" \
 198     "movq   %%xmm2,  16(%[dst1])\n" \
 199     "movq   %%xmm3,  24(%[dst1])\n" \
 200     "movhpd %%xmm2,  16(%[dst2])\n" \
 201     "movhpd %%xmm3,  24(%[dst2])\n"
 202
 203 #ifdef CAN_COMPILE_SSSE3
 204         if (vlc_CPU_SSSE3())
 205         {
 206             for (x = 0; x < (width & ~31); x += 32) {
 207                 asm volatile (
 208                     "movdqu (%[shuffle]), %%xmm7\n"
 209                     LOAD64
 210                     "pshufb  %%xmm7, %%xmm0\n"
 211                     "pshufb  %%xmm7, %%xmm1\n"
 212                     "pshufb  %%xmm7, %%xmm2\n"
 213                     "pshufb  %%xmm7, %%xmm3\n"
 214                     STORE2X32
 215                     : : [dst1]"r"(&dstu[x]), [dst2]"r"(&dstv[x]), [src]"r"(&src[2*x]), [shuffle]"r"(shuffle) : "memory", "xmm0", "xmm1", "xmm2", "xmm3", "xmm7");
 216             }
 217         } else
 218 #endif
 219         {
 220             for (x = 0; x < (width & ~31); x += 32) {
 221                 asm volatile (
 222                     "movdqu (%[mask]), %%xmm7\n"
 223                     LOAD64
 224                     "movdqa   %%xmm0, %%xmm4\n"
 225                     "movdqa   %%xmm1, %%xmm5\n"
 226                     "movdqa   %%xmm2, %%xmm6\n"
 227                     "psrlw    $8,     %%xmm0\n"
 228                     "psrlw    $8,     %%xmm1\n"
 229                     "pand     %%xmm7, %%xmm4\n"
 230                     "pand     %%xmm7, %%xmm5\n"
 231                     "pand     %%xmm7, %%xmm6\n"
 232                     "packuswb %%xmm4, %%xmm0\n"
 233                     "packuswb %%xmm5, %%xmm1\n"
 234                     "pand     %%xmm3, %%xmm7\n"
 235                     "psrlw    $8,     %%xmm2\n"
 236                     "psrlw    $8,     %%xmm3\n"
 237                     "packuswb %%xmm6, %%xmm2\n"
 238                     "packuswb %%xmm7, %%xmm3\n"
 239                     STORE2X32
 240                     : : [dst2]"r"(&dstu[x]), [dst1]"r"(&dstv[x]), [src]"r"(&src[2*x]), [mask]"r"(mask) : "memory", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7");
 241             }
 242         }
 243 #undef STORE2X32
 244 #undef LOAD64
 245
 246         for (; x < width; x++) {
 247             dstu[x] = src[2*x+0];
 248             dstv[x] = src[2*x+1];
 249         }
 250         src  += src_pitch;
 251         dstu += dstu_pitch;
 252         dstv += dstv_pitch;
 253     }
 254 }
 255
 256 static void SSE_CopyPlane(uint8_t *dst, size_t dst_pitch,
 257                           const uint8_t *src, size_t src_pitch,
 258                           uint8_t *cache, size_t cache_size,
 259                           unsigned width, unsigned height, unsigned cpu)
 260 {
 261     const unsigned w16 = (width+15) & ~15;
 262     const unsigned hstep = cache_size / w16;
 263     assert(hstep > 0);
 264
 265     for (unsigned y = 0; y < height; y += hstep) {
 266         const unsigned hblock =  __MIN(hstep, height - y);
 267
 268         /* Copy a bunch of line into our cache */
 269         CopyFromUswc(cache, w16,
 270                      src, src_pitch,
 271                      width, hblock, cpu);
 272
 273         /* Copy from our cache to the destination */
 274         Copy2d(dst, dst_pitch,
 275                cache, w16,
 276                width, hblock);
 277
 278         /* */
 279         src += src_pitch * hblock;
 280         dst += dst_pitch * hblock;
 281     }
 282     asm volatile ("mfence");
 283 }
 284
 285 static void SSE_SplitPlanes(uint8_t *dstu, size_t dstu_pitch,
 286                             uint8_t *dstv, size_t dstv_pitch,
 287                             const uint8_t *src, size_t src_pitch,
 288                             uint8_t *cache, size_t cache_size,
 289                             unsigned width, unsigned height, unsigned cpu)
 290 {
 291     const unsigned w2_16 = (2*width+15) & ~15;
 292     const unsigned hstep = cache_size / w2_16;
 293     assert(hstep > 0);
 294
 295     for (unsigned y = 0; y < height; y += hstep) {
 296         const unsigned hblock =  __MIN(hstep, height - y);
 297
 298         /* Copy a bunch of line into our cache */
 299         CopyFromUswc(cache, w2_16, src, src_pitch,
 300                      2*width, hblock, cpu);
 301
 302         /* Copy from our cache to the destination */
 303         SSE_SplitUV(dstu, dstu_pitch, dstv, dstv_pitch,
 304                     cache, w2_16, width, hblock, cpu);
 305
 306         /* */
 307         src  += src_pitch  * hblock;
 308         dstu += dstu_pitch * hblock;
 309         dstv += dstv_pitch * hblock;
 310     }
 311     asm volatile ("mfence");
 312 }
 313
 314 static void SSE_CopyFromNv12(picture_t *dst,
 315                              uint8_t *src[2], size_t src_pitch[2],
 316                              unsigned width, unsigned height,
 317                              copy_cache_t *cache, unsigned cpu)
 318 {
 319     SSE_CopyPlane(dst->p[0].p_pixels, dst->p[0].i_pitch,
 320                   src[0], src_pitch[0],
 321                   cache->buffer, cache->size,
 322                   width, height, cpu);
 323     SSE_SplitPlanes(dst->p[2].p_pixels, dst->p[2].i_pitch,
 324                     dst->p[1].p_pixels, dst->p[1].i_pitch,
 325                     src[1], src_pitch[1],
 326                     cache->buffer, cache->size,
 327                     width/2, height/2, cpu);
 328     asm volatile ("emms");
 329 }
 330
 331 static void SSE_CopyFromYv12(picture_t *dst,
 332                              uint8_t *src[3], size_t src_pitch[3],
 333                              unsigned width, unsigned height,
 334                              copy_cache_t *cache, unsigned cpu)
 335 {
 336     for (unsigned n = 0; n < 3; n++) {
 337         const unsigned d = n > 0 ? 2 : 1;
 338         SSE_CopyPlane(dst->p[n].p_pixels, dst->p[n].i_pitch,
 339                       src[n], src_pitch[n],
 340                       cache->buffer, cache->size,
 341                       width/d, height/d, cpu);
 342     }
 343     asm volatile ("emms");
 344 }
 345 #undef COPY64
 346 #endif /* CAN_COMPILE_SSE2 */
 347
 348 static void CopyPlane(uint8_t *dst, size_t dst_pitch,
 349                       const uint8_t *src, size_t src_pitch,
 350                       unsigned width, unsigned height)
 351 {
 352     for (unsigned y = 0; y < height; y++) {
 353         memcpy(dst, src, width);
 354         src += src_pitch;
 355         dst += dst_pitch;
 356     }
 357 }
 358
 359 static void SplitPlanes(uint8_t *dstu, size_t dstu_pitch,
 360                         uint8_t *dstv, size_t dstv_pitch,
 361                         const uint8_t *src, size_t src_pitch,
 362                         unsigned width, unsigned height)
 363 {
 364     for (unsigned y = 0; y < height; y++) {
 365         for (unsigned x = 0; x < width; x++) {
 366             dstu[x] = src[2*x+0];
 367             dstv[x] = src[2*x+1];
 368         }
 369         src  += src_pitch;
 370         dstu += dstu_pitch;
 371         dstv += dstv_pitch;
 372     }
 373 }
 374
 375 void CopyFromNv12(picture_t *dst, uint8_t *src[2], size_t src_pitch[2],
 376                   unsigned width, unsigned height,
 377                   copy_cache_t *cache)
 378 {
 379 #ifdef CAN_COMPILE_SSE2
 380     unsigned cpu = vlc_CPU();
 381     if (vlc_CPU_SSE2())
 382         return SSE_CopyFromNv12(dst, src, src_pitch, width, height,
 383                                 cache, cpu);
 384 #else
 385     (void) cache;
 386 #endif
 387
 388     CopyPlane(dst->p[0].p_pixels, dst->p[0].i_pitch,
 389               src[0], src_pitch[0],
 390               width, height);
 391     SplitPlanes(dst->p[2].p_pixels, dst->p[2].i_pitch,
 392                 dst->p[1].p_pixels, dst->p[1].i_pitch,
 393                 src[1], src_pitch[1],
 394                 width/2, height/2);
 395 }
 396
 397 void CopyFromYv12(picture_t *dst, uint8_t *src[3], size_t src_pitch[3],
 398                   unsigned width, unsigned height,
 399                   copy_cache_t *cache)
 400 {
 401 #ifdef CAN_COMPILE_SSE2
 402     unsigned cpu = vlc_CPU();
 403     if (vlc_CPU_SSE2())
 404         return SSE_CopyFromYv12(dst, src, src_pitch, width, height,
 405                                 cache, cpu);
 406 #else
 407     (void) cache;
 408 #endif
 409
 410      CopyPlane(dst->p[0].p_pixels, dst->p[0].i_pitch,
 411                src[0], src_pitch[0], width, height);
 412      CopyPlane(dst->p[1].p_pixels, dst->p[1].i_pitch,
 413                src[1], src_pitch[1], width / 2, height / 2);
 414      CopyPlane(dst->p[2].p_pixels, dst->p[2].i_pitch,
 415                src[1], src_pitch[2], width / 2, height / 2);
 416 }