git.sesse.net Git - ffmpeg/blob - 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
  28 av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
  29                                const uint8_t *src_scantable)
  30 {
  31     int i, end;
  32
  33     st->scantable = src_scantable;
  34
  35     for (i = 0; i < 64; i++) {
  36         int j = src_scantable[i];
  37         st->permutated[i] = permutation[j];
  38     }
  39
  40     end = -1;
  41     for (i = 0; i < 64; i++) {
  42         int j = st->permutated[i];
  43         if (j > end)
  44             end = j;
  45         st->raster_end[i] = end;
  46     }
  47 }
  48
  49 av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
  50                                            int idct_permutation_type)
  51 {
  52     int i;
  53
  54     if (ARCH_X86)
  55         if (ff_init_scantable_permutation_x86(idct_permutation,
  56                                               idct_permutation_type))
  57             return;
  58
  59     switch (idct_permutation_type) {
  60     case FF_NO_IDCT_PERM:
  61         for (i = 0; i < 64; i++)
  62             idct_permutation[i] = i;
  63         break;
  64     case FF_LIBMPEG2_IDCT_PERM:
  65         for (i = 0; i < 64; i++)
  66             idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
  67         break;
  68     case FF_TRANSPOSE_IDCT_PERM:
  69         for (i = 0; i < 64; i++)
  70             idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
  71         break;
  72     case FF_PARTTRANS_IDCT_PERM:
  73         for (i = 0; i < 64; i++)
  74             idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
  75         break;
  76     default:
  77         av_log(NULL, AV_LOG_ERROR,
  78                "Internal error, IDCT permutation not set\n");
  79     }
  80 }
  81
  82 static void put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
  83                                  int line_size)
  84 {
  85     int i;
  86
  87     /* read the pixels */
  88     for (i = 0; i < 8; i++) {
  89         pixels[0] = av_clip_uint8(block[0]);
  90         pixels[1] = av_clip_uint8(block[1]);
  91         pixels[2] = av_clip_uint8(block[2]);
  92         pixels[3] = av_clip_uint8(block[3]);
  93         pixels[4] = av_clip_uint8(block[4]);
  94         pixels[5] = av_clip_uint8(block[5]);
  95         pixels[6] = av_clip_uint8(block[6]);
  96         pixels[7] = av_clip_uint8(block[7]);
  97
  98         pixels += line_size;
  99         block  += 8;
 100     }
 101 }
 102
 103 static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 104                                  int line_size)
 105 {
 106     int i;
 107
 108     /* read the pixels */
 109     for(i=0;i<4;i++) {
 110         pixels[0] = av_clip_uint8(block[0]);
 111         pixels[1] = av_clip_uint8(block[1]);
 112         pixels[2] = av_clip_uint8(block[2]);
 113         pixels[3] = av_clip_uint8(block[3]);
 114
 115         pixels += line_size;
 116         block += 8;
 117     }
 118 }
 119
 120 static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 121                                  int line_size)
 122 {
 123     int i;
 124
 125     /* read the pixels */
 126     for(i=0;i<2;i++) {
 127         pixels[0] = av_clip_uint8(block[0]);
 128         pixels[1] = av_clip_uint8(block[1]);
 129
 130         pixels += line_size;
 131         block += 8;
 132     }
 133 }
 134
 135 static void put_signed_pixels_clamped_c(const int16_t *block,
 136                                         uint8_t *av_restrict pixels,
 137                                         int line_size)
 138 {
 139     int i, j;
 140
 141     for (i = 0; i < 8; i++) {
 142         for (j = 0; j < 8; j++) {
 143             if (*block < -128)
 144                 *pixels = 0;
 145             else if (*block > 127)
 146                 *pixels = 255;
 147             else
 148                 *pixels = (uint8_t) (*block + 128);
 149             block++;
 150             pixels++;
 151         }
 152         pixels += (line_size - 8);
 153     }
 154 }
 155
 156 static void add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
 157                                  int line_size)
 158 {
 159     int i;
 160
 161     /* read the pixels */
 162     for (i = 0; i < 8; i++) {
 163         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 164         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 165         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 166         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 167         pixels[4] = av_clip_uint8(pixels[4] + block[4]);
 168         pixels[5] = av_clip_uint8(pixels[5] + block[5]);
 169         pixels[6] = av_clip_uint8(pixels[6] + block[6]);
 170         pixels[7] = av_clip_uint8(pixels[7] + block[7]);
 171         pixels   += line_size;
 172         block    += 8;
 173     }
 174 }
 175
 176 static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
 177                           int line_size)
 178 {
 179     int i;
 180
 181     /* read the pixels */
 182     for(i=0;i<4;i++) {
 183         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 184         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 185         pixels[2] = av_clip_uint8(pixels[2] + block[2]);
 186         pixels[3] = av_clip_uint8(pixels[3] + block[3]);
 187         pixels += line_size;
 188         block += 8;
 189     }
 190 }
 191
 192 static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
 193                           int line_size)
 194 {
 195     int i;
 196
 197     /* read the pixels */
 198     for(i=0;i<2;i++) {
 199         pixels[0] = av_clip_uint8(pixels[0] + block[0]);
 200         pixels[1] = av_clip_uint8(pixels[1] + block[1]);
 201         pixels += line_size;
 202         block += 8;
 203     }
 204 }
 205
 206 static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
 207 {
 208     ff_j_rev_dct(block);
 209     put_pixels_clamped_c(block, dest, line_size);
 210 }
 211
 212 static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
 213 {
 214     ff_j_rev_dct(block);
 215     add_pixels_clamped_c(block, dest, line_size);
 216 }
 217 static void ff_jref_idct4_put(uint8_t *dest, int line_size, int16_t *block)
 218 {
 219     ff_j_rev_dct4 (block);
 220     put_pixels_clamped4_c(block, dest, line_size);
 221 }
 222 static void ff_jref_idct4_add(uint8_t *dest, int line_size, int16_t *block)
 223 {
 224     ff_j_rev_dct4 (block);
 225     add_pixels_clamped4_c(block, dest, line_size);
 226 }
 227
 228 static void ff_jref_idct2_put(uint8_t *dest, int line_size, int16_t *block)
 229 {
 230     ff_j_rev_dct2 (block);
 231     put_pixels_clamped2_c(block, dest, line_size);
 232 }
 233 static void ff_jref_idct2_add(uint8_t *dest, int line_size, int16_t *block)
 234 {
 235     ff_j_rev_dct2 (block);
 236     add_pixels_clamped2_c(block, dest, line_size);
 237 }
 238
 239 static void ff_jref_idct1_put(uint8_t *dest, int line_size, int16_t *block)
 240 {
 241     dest[0] = av_clip_uint8((block[0] + 4)>>3);
 242 }
 243 static void ff_jref_idct1_add(uint8_t *dest, int line_size, int16_t *block)
 244 {
 245     dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
 246 }
 247
 248 av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
 249 {
 250     const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
 251
 252     if (avctx->lowres==1) {
 253         c->idct_put              = ff_jref_idct4_put;
 254         c->idct_add              = ff_jref_idct4_add;
 255         c->idct                  = ff_j_rev_dct4;
 256         c->idct_permutation_type = FF_NO_IDCT_PERM;
 257     } else if (avctx->lowres==2) {
 258         c->idct_put              =  ff_jref_idct2_put;
 259         c->idct_add              =  ff_jref_idct2_add;
 260         c->idct                  =  ff_j_rev_dct2;
 261         c->idct_permutation_type = FF_NO_IDCT_PERM;
 262     } else if (avctx->lowres==3) {
 263         c->idct_put              =  ff_jref_idct1_put;
 264         c->idct_add              =  ff_jref_idct1_add;
 265         c->idct                  =  ff_j_rev_dct1;
 266         c->idct_permutation_type = FF_NO_IDCT_PERM;
 267     } else {
 268         if (avctx->bits_per_raw_sample == 10) {
 269             c->idct_put              = ff_simple_idct_put_10;
 270             c->idct_add              = ff_simple_idct_add_10;
 271             c->idct                  = ff_simple_idct_10;
 272             c->idct_permutation_type = FF_NO_IDCT_PERM;
 273         } else if (avctx->bits_per_raw_sample == 12) {
 274             c->idct_put              = ff_simple_idct_put_12;
 275             c->idct_add              = ff_simple_idct_add_12;
 276             c->idct                  = ff_simple_idct_12;
 277             c->idct_permutation_type = FF_NO_IDCT_PERM;
 278         } else {
 279         if (avctx->idct_algo == FF_IDCT_INT) {
 280             c->idct_put              = jref_idct_put;
 281             c->idct_add              = jref_idct_add;
 282             c->idct                  = ff_j_rev_dct;
 283             c->idct_permutation_type = FF_LIBMPEG2_IDCT_PERM;
 284         } else if (avctx->idct_algo == FF_IDCT_FAAN) {
 285             c->idct_put              = ff_faanidct_put;
 286             c->idct_add              = ff_faanidct_add;
 287             c->idct                  = ff_faanidct;
 288             c->idct_permutation_type = FF_NO_IDCT_PERM;
 289         } else { // accurate/default
 290             c->idct_put              = ff_simple_idct_put_8;
 291             c->idct_add              = ff_simple_idct_add_8;
 292             c->idct                  = ff_simple_idct_8;
 293             c->idct_permutation_type = FF_NO_IDCT_PERM;
 294         }
 295         }
 296     }
 297
 298     c->put_pixels_clamped        = put_pixels_clamped_c;
 299     c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
 300     c->add_pixels_clamped        = add_pixels_clamped_c;
 301
 302     if (ARCH_ALPHA)
 303         ff_idctdsp_init_alpha(c, avctx, high_bit_depth);
 304     if (ARCH_ARM)
 305         ff_idctdsp_init_arm(c, avctx, high_bit_depth);
 306     if (ARCH_PPC)
 307         ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
 308     if (ARCH_X86)
 309         ff_idctdsp_init_x86(c, avctx, high_bit_depth);
 310
 311     ff_init_scantable_permutation(c->idct_permutation,
 312                                   c->idct_permutation_type);
 313 }