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 void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
  84 void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
  85
  86 static void put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
  87                                  ptrdiff_t line_size)
  88 {
  89     int i;
  90
  91     /* read the pixels */
  92     for (i = 0; i < 8; i++) {
  93         pixels[0] = av_clip_uint8(block[0]);
  94         pixels[1] = av_clip_uint8(block[1]);
  95         pixels[2] = av_clip_uint8(block[2]);
  96         pixels[3] = av_clip_uint8(block[3]);
  97         pixels[4] = av_clip_uint8(block[4]);
  98         pixels[5] = av_clip_uint8(block[5]);
  99         pixels[6] = av_clip_uint8(block[6]);
 100         pixels[7] = av_clip_uint8(block[7]);
 101
 102         pixels += line_size;
 103         block  += 8;
 104     }
 105 }
 106
 107 static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 108                                  int line_size)
 109 {
 110     int i;
 111
 112     /* read the pixels */
 113     for(i=0;i<4;i++) {
 114         pixels[0] = av_clip_uint8(block[0]);
 115         pixels[1] = av_clip_uint8(block[1]);
 116         pixels[2] = av_clip_uint8(block[2]);
 117         pixels[3] = av_clip_uint8(block[3]);
 118
 119         pixels += line_size;
 120         block += 8;
 121     }
 122 }
 123
 124 static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 125                                  int line_size)
 126 {
 127     int i;
 128
 129     /* read the pixels */
 130     for(i=0;i<2;i++) {
 131         pixels[0] = av_clip_uint8(block[0]);
 132         pixels[1] = av_clip_uint8(block[1]);
 133
 134         pixels += line_size;
 135         block += 8;
 136     }
 137 }
 138
 139 static void put_signed_pixels_clamped_c(const int16_t *block,
 140                                         uint8_t *av_restrict pixels,
 141                                         ptrdiff_t line_size)
 142 {
 143     int i, j;
 144
 145     for (i = 0; i < 8; i++) {
 146         for (j = 0; j < 8; j++) {
 147             if (*block < -128)
 148                 *pixels = 0;
 149             else if (*block > 127)
 150                 *pixels = 255;
 151             else
 152                 *pixels = (uint8_t) (*block + 128);
 153             block++;
 154             pixels++;
 155         }
 156         pixels += (line_size - 8);
 157     }
 158 }
 159
 160 static void add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
 161                                  ptrdiff_t line_size)
 162 {
 163     int i;
 164
 165     /* read the pixels */
 166     for (i = 0; i < 8; i++) {
 167         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 168         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 169         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 170         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 171         pixels[4] = av_clip_uint8(pixels[4] + block[4]);
 172         pixels[5] = av_clip_uint8(pixels[5] + block[5]);
 173         pixels[6] = av_clip_uint8(pixels[6] + block[6]);
 174         pixels[7] = av_clip_uint8(pixels[7] + block[7]);
 175         pixels   += line_size;
 176         block    += 8;
 177     }
 178 }
 179
 180 static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 181                           int line_size)
 182 {
 183     int i;
 184
 185     /* read the pixels */
 186     for(i=0;i<4;i++) {
 187         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 188         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 189         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 190         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 191         pixels += line_size;
 192         block += 8;
 193     }
 194 }
 195
 196 static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 197                           int line_size)
 198 {
 199     int i;
 200
 201     /* read the pixels */
 202     for(i=0;i<2;i++) {
 203         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 204         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 205         pixels += line_size;
 206         block += 8;
 207     }
 208 }
 209
 210 static void ff_jref_idct4_put(uint8_t *dest, int line_size, int16_t *block)
 211 {
 212     ff_j_rev_dct4 (block);
 213     put_pixels_clamped4_c(block, dest, line_size);
 214 }
 215 static void ff_jref_idct4_add(uint8_t *dest, int line_size, int16_t *block)
 216 {
 217     ff_j_rev_dct4 (block);
 218     add_pixels_clamped4_c(block, dest, line_size);
 219 }
 220
 221 static void ff_jref_idct2_put(uint8_t *dest, int line_size, int16_t *block)
 222 {
 223     ff_j_rev_dct2 (block);
 224     put_pixels_clamped2_c(block, dest, line_size);
 225 }
 226 static void ff_jref_idct2_add(uint8_t *dest, int line_size, int16_t *block)
 227 {
 228     ff_j_rev_dct2 (block);
 229     add_pixels_clamped2_c(block, dest, line_size);
 230 }
 231
 232 static void ff_jref_idct1_put(uint8_t *dest, int line_size, int16_t *block)
 233 {
 234     dest[0] = av_clip_uint8((block[0] + 4)>>3);
 235 }
 236 static void ff_jref_idct1_add(uint8_t *dest, int line_size, int16_t *block)
 237 {
 238     dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
 239 }
 240
 241 av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
 242 {
 243     const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
 244
 245     if (avctx->lowres==1) {
 246         c->idct_put  = ff_jref_idct4_put;
 247         c->idct_add  = ff_jref_idct4_add;
 248         c->idct      = ff_j_rev_dct4;
 249         c->perm_type = FF_IDCT_PERM_NONE;
 250     } else if (avctx->lowres==2) {
 251         c->idct_put  = ff_jref_idct2_put;
 252         c->idct_add  = ff_jref_idct2_add;
 253         c->idct      = ff_j_rev_dct2;
 254         c->perm_type = FF_IDCT_PERM_NONE;
 255     } else if (avctx->lowres==3) {
 256         c->idct_put  = ff_jref_idct1_put;
 257         c->idct_add  = ff_jref_idct1_add;
 258         c->idct      = ff_j_rev_dct1;
 259         c->perm_type = FF_IDCT_PERM_NONE;
 260     } else {
 261         if (avctx->bits_per_raw_sample == 10) {
 262             c->idct_put              = ff_simple_idct_put_10;
 263             c->idct_add              = ff_simple_idct_add_10;
 264             c->idct                  = ff_simple_idct_10;
 265             c->perm_type             = FF_IDCT_PERM_NONE;
 266         } else if (avctx->bits_per_raw_sample == 12) {
 267             c->idct_put              = ff_simple_idct_put_12;
 268             c->idct_add              = ff_simple_idct_add_12;
 269             c->idct                  = ff_simple_idct_12;
 270             c->perm_type             = FF_IDCT_PERM_NONE;
 271         } else {
 272             if (avctx->idct_algo == FF_IDCT_INT) {
 273                 c->idct_put  = ff_jref_idct_put;
 274                 c->idct_add  = ff_jref_idct_add;
 275                 c->idct      = ff_j_rev_dct;
 276                 c->perm_type = FF_IDCT_PERM_LIBMPEG2;
 277 #if CONFIG_FAANIDCT
 278             } else if (avctx->idct_algo == FF_IDCT_FAAN) {
 279                 c->idct_put  = ff_faanidct_put;
 280                 c->idct_add  = ff_faanidct_add;
 281                 c->idct      = ff_faanidct;
 282                 c->perm_type = FF_IDCT_PERM_NONE;
 283 #endif /* CONFIG_FAANIDCT */
 284             } else { // accurate/default
 285                 c->idct_put  = ff_simple_idct_put_8;
 286                 c->idct_add  = ff_simple_idct_add_8;
 287                 c->idct      = ff_simple_idct_8;
 288                 c->perm_type = FF_IDCT_PERM_NONE;
 289             }
 290         }
 291     }
 292
 293     c->put_pixels_clamped        = put_pixels_clamped_c;
 294     c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
 295     c->add_pixels_clamped        = add_pixels_clamped_c;
 296
 297     if (CONFIG_MPEG4_DECODER && avctx->idct_algo == FF_IDCT_XVID)
 298         ff_xvid_idct_init(c, avctx);
 299
 300     if (ARCH_ALPHA)
 301         ff_idctdsp_init_alpha(c, avctx, high_bit_depth);
 302     if (ARCH_ARM)
 303         ff_idctdsp_init_arm(c, avctx, high_bit_depth);
 304     if (ARCH_PPC)
 305         ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
 306     if (ARCH_X86)
 307         ff_idctdsp_init_x86(c, avctx, high_bit_depth);
 308
 309     ff_put_pixels_clamped = c->put_pixels_clamped;
 310     ff_add_pixels_clamped = c->add_pixels_clamped;
 311
 312     ff_init_scantable_permutation(c->idct_permutation,
 313                                   c->perm_type);
 314 }