git.sesse.net Git - ffmpeg/blob - libavcodec/mpegvideo_xvmc.c

   1 /*
   2  * XVideo Motion Compensation
   3  * Copyright (c) 2003 Ivan Kalvachev
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <limits.h>
  23
  24 #include "avcodec.h"
  25 #include "dsputil.h"
  26 #include "mpegvideo.h"
  27
  28 #undef NDEBUG
  29 #include <assert.h>
  30
  31 #include "xvmc.h"
  32 #include "xvmc_internal.h"
  33
  34 //set s->block
  35 void ff_xvmc_init_block(MpegEncContext *s)
  36 {
  37     struct xvmc_render_state *render;
  38     render = (struct xvmc_render_state*)s->current_picture.data[2];
  39     assert(render);
  40     if (!render || render->magic != AV_XVMC_RENDER_MAGIC) {
  41         assert(0);
  42         return; // make sure that this is a render packet
  43     }
  44     s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
  45 }
  46
  47 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
  48 {
  49     int i, j;
  50     const int mb_block_count = 4 + (1 << s->chroma_format);
  51
  52     j = 0;
  53     cbp <<= 12-mb_block_count;
  54     for (i = 0; i < mb_block_count; i++) {
  55         if (cbp & (1 << 11))
  56             s->pblocks[i] = (short *)(&s->block[j++]);
  57         else
  58             s->pblocks[i] = NULL;
  59         cbp+=cbp;
  60     }
  61 }
  62
  63 // These functions should be called on every new field and/or frame.
  64 // They should be safe if they are called a few times for the same field!
  65 int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
  66 {
  67     struct xvmc_render_state *render, *last, *next;
  68
  69     assert(avctx);
  70
  71     render = (struct xvmc_render_state*)s->current_picture.data[2];
  72     assert(render);
  73     if (!render || render->magic != AV_XVMC_RENDER_MAGIC)
  74         return -1; // make sure that this is a render packet
  75
  76     render->picture_structure = s->picture_structure;
  77     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
  78
  79     if (render->filled_mv_blocks_num) {
  80         av_log(avctx, AV_LOG_ERROR,
  81                "Rendering surface contains %i unprocessed blocks\n",
  82                render->filled_mv_blocks_num);
  83         return -1;
  84     }
  85
  86     render->p_future_surface = NULL;
  87     render->p_past_surface   = NULL;
  88
  89     switch(s->pict_type) {
  90         case  FF_I_TYPE:
  91             return 0; // no prediction from other frames
  92         case  FF_B_TYPE:
  93             next = (struct xvmc_render_state*)s->next_picture.data[2];
  94             assert(next);
  95             if (!next)
  96                 return -1;
  97             if (next->magic != AV_XVMC_RENDER_MAGIC)
  98                 return -1;
  99             render->p_future_surface = next->p_surface;
 100             // no return here, going to set forward prediction
 101         case  FF_P_TYPE:
 102             last = (struct xvmc_render_state*)s->last_picture.data[2];
 103             if (!last)
 104                 last = render; // predict second field from the first
 105             if (last->magic != AV_XVMC_RENDER_MAGIC)
 106                 return -1;
 107             render->p_past_surface = last->p_surface;
 108             return 0;
 109     }
 110
 111 return -1;
 112 }
 113
 114 void ff_xvmc_field_end(MpegEncContext *s)
 115 {
 116     struct xvmc_render_state *render;
 117     render = (struct xvmc_render_state*)s->current_picture.data[2];
 118     assert(render);
 119
 120     if (render->filled_mv_blocks_num > 0)
 121         ff_draw_horiz_band(s, 0, 0);
 122 }
 123
 124 void ff_xvmc_decode_mb(MpegEncContext *s)
 125 {
 126     XvMCMacroBlock *mv_block;
 127     struct xvmc_render_state *render;
 128     int i, cbp, blocks_per_mb;
 129
 130     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 131
 132
 133     if (s->encoding) {
 134         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 135         return;
 136     }
 137
 138     // from MPV_decode_mb(), update DC predictors for P macroblocks
 139     if (!s->mb_intra) {
 140         s->last_dc[0] =
 141         s->last_dc[1] =
 142         s->last_dc[2] =  128 << s->intra_dc_precision;
 143     }
 144
 145     // MC doesn't skip blocks
 146     s->mb_skipped = 0;
 147
 148
 149     // Do I need to export quant when I could not perform postprocessing?
 150     // Anyway, it doesn't hurt.
 151     s->current_picture.qscale_table[mb_xy] = s->qscale;
 152
 153     // start of XVMC-specific code
 154     render = (struct xvmc_render_state*)s->current_picture.data[2];
 155     assert(render);
 156     assert(render->magic == AV_XVMC_RENDER_MAGIC);
 157     assert(render->mv_blocks);
 158
 159     // take the next free macroblock
 160     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 161                                   render->filled_mv_blocks_num ];
 162
 163     mv_block->x        = s->mb_x;
 164     mv_block->y        = s->mb_y;
 165     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 166     if (s->mb_intra) {
 167         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 168     } else {
 169         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 170
 171         if (s->mv_dir & MV_DIR_FORWARD) {
 172             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 173             // PMV[n][dir][xy] = mv[dir][n][xy]
 174             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 175             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 176             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 177             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 178         }
 179         if (s->mv_dir & MV_DIR_BACKWARD) {
 180             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 181             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 182             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 183             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 184             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 185         }
 186
 187         switch(s->mv_type) {
 188             case  MV_TYPE_16X16:
 189                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 190                 break;
 191             case  MV_TYPE_16X8:
 192                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 193                 break;
 194             case  MV_TYPE_FIELD:
 195                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 196                 if (s->picture_structure == PICT_FRAME) {
 197                     mv_block->PMV[0][0][1] <<= 1;
 198                     mv_block->PMV[1][0][1] <<= 1;
 199                     mv_block->PMV[0][1][1] <<= 1;
 200                     mv_block->PMV[1][1][1] <<= 1;
 201                 }
 202                 break;
 203             case  MV_TYPE_DMV:
 204                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 205                 if (s->picture_structure == PICT_FRAME) {
 206
 207                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 208                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 209
 210                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 211                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 212
 213                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 214                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 215
 216                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 217                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 218
 219                 } else {
 220                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 221                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 222                 }
 223                 break;
 224             default:
 225                 assert(0);
 226         }
 227
 228         mv_block->motion_vertical_field_select = 0;
 229
 230         // set correct field references
 231         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 232             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 233             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 234             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 235             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 236         }
 237     } // !intra
 238     // time to handle data blocks
 239     mv_block->index = render->next_free_data_block_num;
 240
 241     blocks_per_mb = 6;
 242     if (s->chroma_format >= 2) {
 243         blocks_per_mb = 4 + (1 << s->chroma_format);
 244     }
 245
 246     // calculate cbp
 247     cbp = 0;
 248     for (i = 0; i < blocks_per_mb; i++) {
 249         cbp += cbp;
 250         if (s->block_last_index[i] >= 0)
 251             cbp++;
 252     }
 253
 254     if (s->flags & CODEC_FLAG_GRAY) {
 255         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 256             for (i = 4; i < blocks_per_mb; i++) {
 257                 memset(s->pblocks[i], 0, sizeof(short)*64);  // so we need to clear them
 258                 if (!render->unsigned_intra)
 259                     s->pblocks[i][0] = 1 << 10;
 260             }
 261         } else {
 262             cbp &= 0xf << (blocks_per_mb - 4);
 263             blocks_per_mb = 4;                               // luminance blocks only
 264         }
 265     }
 266     mv_block->coded_block_pattern = cbp;
 267     if (cbp == 0)
 268         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 269
 270     for (i = 0; i < blocks_per_mb; i++) {
 271         if (s->block_last_index[i] >= 0) {
 272             // I do not have unsigned_intra MOCO to test, hope it is OK.
 273             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
 274                 s->pblocks[i][0] -= 1 << 10;
 275             if (!render->idct) {
 276                 s->dsp.idct(s->pblocks[i]);
 277                 /* It is unclear if MC hardware requires pixel diff values to be
 278                  * in the range [-255;255]. TODO: Clipping if such hardware is
 279                  * ever found. As of now it would only be an unnecessary
 280                  * slowdown. */
 281             }
 282             // copy blocks only if the codec doesn't support pblocks reordering
 283             if (s->avctx->xvmc_acceleration == 1) {
 284                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 285                        s->pblocks[i], sizeof(short)*64);
 286             }
 287             render->next_free_data_block_num++;
 288         }
 289     }
 290     render->filled_mv_blocks_num++;
 291
 292     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
 293     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
 294     /* The above conditions should not be able to fail as long as this function
 295      * is used and the following 'if ()' automatically calls a callback to free
 296      * blocks. */
 297
 298
 299     if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
 300         ff_draw_horiz_band(s, 0, 0);
 301 }