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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #include "config.h"
  20. #include "libavutil/attributes.h"
  21. #include "libavutil/cpu.h"
  22. #include "libavutil/x86/cpu.h"
  23. #include "libavcodec/avcodec.h"
  24. #include "libavcodec/idctdsp.h"
  25. #include "idctdsp.h"
  26. #include "simple_idct.h"
  27.  
  28. /* Input permutation for the simple_idct_mmx */
  29. static const uint8_t simple_mmx_permutation[64] = {
  30.     0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D,
  31.     0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D,
  32.     0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D,
  33.     0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F,
  34.     0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F,
  35.     0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D,
  36.     0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F,
  37.     0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,
  38. };
  39.  
  40. static const uint8_t idct_sse2_row_perm[8] = { 0, 4, 1, 5, 2, 6, 3, 7 };
  41.  
  42. av_cold int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
  43.                                               enum idct_permutation_type perm_type)
  44. {
  45.     int i;
  46.  
  47.     switch (perm_type) {
  48.     case FF_IDCT_PERM_SIMPLE:
  49.         for (i = 0; i < 64; i++)
  50.             idct_permutation[i] = simple_mmx_permutation[i];
  51.         return 1;
  52.     case FF_IDCT_PERM_SSE2:
  53.         for (i = 0; i < 64; i++)
  54.             idct_permutation[i] = (i & 0x38) | idct_sse2_row_perm[i & 7];
  55.         return 1;
  56.     }
  57.  
  58.     return 0;
  59. }
  60.  
  61. av_cold void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
  62.                                  unsigned high_bit_depth)
  63. {
  64.     int cpu_flags = av_get_cpu_flags();
  65.  
  66.     if (INLINE_MMX(cpu_flags)) {
  67.         if (!high_bit_depth &&
  68.             avctx->lowres == 0 &&
  69.             (avctx->idct_algo == FF_IDCT_AUTO ||
  70.              avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
  71.              avctx->idct_algo == FF_IDCT_SIMPLEMMX)) {
  72.                 c->idct_put  = ff_simple_idct_put_mmx;
  73.                 c->idct_add  = ff_simple_idct_add_mmx;
  74.                 c->idct      = ff_simple_idct_mmx;
  75.                 c->perm_type = FF_IDCT_PERM_SIMPLE;
  76.         }
  77.     }
  78.     if (EXTERNAL_MMX(cpu_flags)) {
  79.         c->put_signed_pixels_clamped = ff_put_signed_pixels_clamped_mmx;
  80.         c->put_pixels_clamped        = ff_put_pixels_clamped_mmx;
  81.         c->add_pixels_clamped        = ff_add_pixels_clamped_mmx;
  82.     }
  83.     if (EXTERNAL_SSE2(cpu_flags)) {
  84.         c->put_signed_pixels_clamped = ff_put_signed_pixels_clamped_sse2;
  85.         c->put_pixels_clamped        = ff_put_pixels_clamped_sse2;
  86.         c->add_pixels_clamped        = ff_add_pixels_clamped_sse2;
  87.     }
  88. }
  89.