src/third_party/ffmpeg/libavcodec/idctdsp.c

   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/common.h"
  22 #include "avcodec.h"
  23 #include "dct.h"
  24 #include "faanidct.h"
  25 #include "idctdsp.h"
  26 #include "simple_idct.h"
  27 #include "xvididct.h"
  28
  29 av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
  30                                const uint8_t *src_scantable)
  31 {
  32     int i, end;
  33
  34     st->scantable = src_scantable;
  35
  36     for (i = 0; i < 64; i++) {
  37         int j = src_scantable[i];
  38         st->permutated[i] = permutation[j];
  39     }
  40
  41     end = -1;
  42     for (i = 0; i < 64; i++) {
  43         int j = st->permutated[i];
  44         if (j > end)
  45             end = j;
  46         st->raster_end[i] = end;
  47     }
  48 }
  49
  50 av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
  51                                            enum idct_permutation_type perm_type)
  52 {
  53     int i;
  54
  55     if (ARCH_X86)
  56         if (ff_init_scantable_permutation_x86(idct_permutation,
  57                                               perm_type))
  58             return;
  59
  60     switch (perm_type) {
  61     case FF_IDCT_PERM_NONE:
  62         for (i = 0; i < 64; i++)
  63             idct_permutation[i] = i;
  64         break;
  65     case FF_IDCT_PERM_LIBMPEG2:
  66         for (i = 0; i < 64; i++)
  67             idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
  68         break;
  69     case FF_IDCT_PERM_TRANSPOSE:
  70         for (i = 0; i < 64; i++)
  71             idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
  72         break;
  73     case FF_IDCT_PERM_PARTTRANS:
  74         for (i = 0; i < 64; i++)
  75             idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
  76         break;
  77     default:
  78         av_log(NULL, AV_LOG_ERROR,
  79                "Internal error, IDCT permutation not set\n");
  80     }
  81 }
  82
  83 static void put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
  84                                  int line_size)
  85 {
  86     int i;
  87
  88     /* read the pixels */
  89     for (i = 0; i < 8; i++) {
  90         pixels[0] = av_clip_uint8(block[0]);
  91         pixels[1] = av_clip_uint8(block[1]);
  92         pixels[2] = av_clip_uint8(block[2]);
  93         pixels[3] = av_clip_uint8(block[3]);
  94         pixels[4] = av_clip_uint8(block[4]);
  95         pixels[5] = av_clip_uint8(block[5]);
  96         pixels[6] = av_clip_uint8(block[6]);
  97         pixels[7] = av_clip_uint8(block[7]);
  98
  99         pixels += line_size;
 100         block  += 8;
 101     }
 102 }
 103
 104 static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 105                                  int line_size)
 106 {
 107     int i;
 108
 109     /* read the pixels */
 110     for(i=0;i<4;i++) {
 111         pixels[0] = av_clip_uint8(block[0]);
 112         pixels[1] = av_clip_uint8(block[1]);
 113         pixels[2] = av_clip_uint8(block[2]);
 114         pixels[3] = av_clip_uint8(block[3]);
 115
 116         pixels += line_size;
 117         block += 8;
 118     }
 119 }
 120
 121 static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 122                                  int line_size)
 123 {
 124     int i;
 125
 126     /* read the pixels */
 127     for(i=0;i<2;i++) {
 128         pixels[0] = av_clip_uint8(block[0]);
 129         pixels[1] = av_clip_uint8(block[1]);
 130
 131         pixels += line_size;
 132         block += 8;
 133     }
 134 }
 135
 136 static void put_signed_pixels_clamped_c(const int16_t *block,
 137                                         uint8_t *av_restrict pixels,
 138                                         int line_size)
 139 {
 140     int i, j;
 141
 142     for (i = 0; i < 8; i++) {
 143         for (j = 0; j < 8; j++) {
 144             if (*block < -128)
 145                 *pixels = 0;
 146             else if (*block > 127)
 147                 *pixels = 255;
 148             else
 149                 *pixels = (uint8_t) (*block + 128);
 150             block++;
 151             pixels++;
 152         }
 153         pixels += (line_size - 8);
 154     }
 155 }
 156
 157 static void add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
 158                                  int line_size)
 159 {
 160     int i;
 161
 162     /* read the pixels */
 163     for (i = 0; i < 8; i++) {
 164         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 165         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 166         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 167         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 168         pixels[4] = av_clip_uint8(pixels[4] + block[4]);
 169         pixels[5] = av_clip_uint8(pixels[5] + block[5]);
 170         pixels[6] = av_clip_uint8(pixels[6] + block[6]);
 171         pixels[7] = av_clip_uint8(pixels[7] + block[7]);
 172         pixels   += line_size;
 173         block    += 8;
 174     }
 175 }
 176
 177 static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 178                           int line_size)
 179 {
 180     int i;
 181
 182     /* read the pixels */
 183     for(i=0;i<4;i++) {
 184         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 185         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 186         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 187         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 188         pixels += line_size;
 189         block += 8;
 190     }
 191 }
 192
 193 static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 194                           int line_size)
 195 {
 196     int i;
 197
 198     /* read the pixels */
 199     for(i=0;i<2;i++) {
 200         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 201         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 202         pixels += line_size;
 203         block += 8;
 204     }
 205 }
 206
 207 static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
 208 {
 209     ff_j_rev_dct(block);
 210     put_pixels_clamped_c(block, dest, line_size);
 211 }
 212
 213 static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
 214 {
 215     ff_j_rev_dct(block);
 216     add_pixels_clamped_c(block, dest, line_size);
 217 }
 218 static void ff_jref_idct4_put(uint8_t *dest, int line_size, int16_t *block)
 219 {
 220     ff_j_rev_dct4 (block);
 221     put_pixels_clamped4_c(block, dest, line_size);
 222 }
 223 static void ff_jref_idct4_add(uint8_t *dest, int line_size, int16_t *block)
 224 {
 225     ff_j_rev_dct4 (block);
 226     add_pixels_clamped4_c(block, dest, line_size);
 227 }
 228
 229 static void ff_jref_idct2_put(uint8_t *dest, int line_size, int16_t *block)
 230 {
 231     ff_j_rev_dct2 (block);
 232     put_pixels_clamped2_c(block, dest, line_size);
 233 }
 234 static void ff_jref_idct2_add(uint8_t *dest, int line_size, int16_t *block)
 235 {
 236     ff_j_rev_dct2 (block);
 237     add_pixels_clamped2_c(block, dest, line_size);
 238 }
 239
 240 static void ff_jref_idct1_put(uint8_t *dest, int line_size, int16_t *block)
 241 {
 242     dest[0] = av_clip_uint8((block[0] + 4)>>3);
 243 }
 244 static void ff_jref_idct1_add(uint8_t *dest, int line_size, int16_t *block)
 245 {
 246     dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
 247 }
 248
 249 av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
 250 {
 251     const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
 252
 253     if (avctx->lowres==1) {
 254         c->idct_put  = ff_jref_idct4_put;
 255         c->idct_add  = ff_jref_idct4_add;
 256         c->idct      = ff_j_rev_dct4;
 257         c->perm_type = FF_IDCT_PERM_NONE;
 258     } else if (avctx->lowres==2) {
 259         c->idct_put  = ff_jref_idct2_put;
 260         c->idct_add  = ff_jref_idct2_add;
 261         c->idct      = ff_j_rev_dct2;
 262         c->perm_type = FF_IDCT_PERM_NONE;
 263     } else if (avctx->lowres==3) {
 264         c->idct_put  = ff_jref_idct1_put;
 265         c->idct_add  = ff_jref_idct1_add;
 266         c->idct      = ff_j_rev_dct1;
 267         c->perm_type = FF_IDCT_PERM_NONE;
 268     } else {
 269         if (avctx->bits_per_raw_sample == 10) {
 270             c->idct_put              = ff_simple_idct_put_10;
 271             c->idct_add              = ff_simple_idct_add_10;
 272             c->idct                  = ff_simple_idct_10;
 273             c->perm_type             = FF_IDCT_PERM_NONE;
 274         } else if (avctx->bits_per_raw_sample == 12) {
 275             c->idct_put              = ff_simple_idct_put_12;
 276             c->idct_add              = ff_simple_idct_add_12;
 277             c->idct                  = ff_simple_idct_12;
 278             c->perm_type             = FF_IDCT_PERM_NONE;
 279         } else {
 280         if (avctx->idct_algo == FF_IDCT_INT) {
 281             c->idct_put  = jref_idct_put;
 282             c->idct_add  = jref_idct_add;
 283             c->idct      = ff_j_rev_dct;
 284             c->perm_type = FF_IDCT_PERM_LIBMPEG2;
 285         } else if (avctx->idct_algo == FF_IDCT_FAAN) {
 286             c->idct_put  = ff_faanidct_put;
 287             c->idct_add  = ff_faanidct_add;
 288             c->idct      = ff_faanidct;
 289             c->perm_type = FF_IDCT_PERM_NONE;
 290         } else { // accurate/default
 291             c->idct_put  = ff_simple_idct_put_8;
 292             c->idct_add  = ff_simple_idct_add_8;
 293             c->idct      = ff_simple_idct_8;
 294             c->perm_type = FF_IDCT_PERM_NONE;
 295         }
 296         }
 297     }
 298
 299     c->put_pixels_clamped        = put_pixels_clamped_c;
 300     c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
 301     c->add_pixels_clamped        = add_pixels_clamped_c;
 302
 303     if (CONFIG_MPEG4_DECODER && avctx->idct_algo == FF_IDCT_XVIDMMX)
 304         ff_xvididct_init(c, avctx);
 305
 306     if (ARCH_ALPHA)
 307         ff_idctdsp_init_alpha(c, avctx, high_bit_depth);
 308     if (ARCH_ARM)
 309         ff_idctdsp_init_arm(c, avctx, high_bit_depth);
 310     if (ARCH_PPC)
 311         ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
 312     if (ARCH_X86)
 313         ff_idctdsp_init_x86(c, avctx, high_bit_depth);
 314
 315     ff_init_scantable_permutation(c->idct_permutation,
 316                                   c->perm_type);
 317 }