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 /**
  35  * Initializes the block field of the MpegEncContext pointer passed as
  36  * parameter after making sure that the data is not corrupted.
  37  */
  38 void ff_xvmc_init_block(MpegEncContext *s)
  39 {
  40     struct xvmc_pixfmt_render *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
  41     assert(render && render->magic_id == AV_XVMC_RENDER_MAGIC);
  42
  43     s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
  44 }
  45
  46 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
  47 {
  48     int i, j = 0;
  49     const int mb_block_count = 4 + (1 << s->chroma_format);
  50
  51     cbp <<= 12-mb_block_count;
  52     for (i = 0; i < mb_block_count; i++) {
  53         if (cbp & (1 << 11))
  54             s->pblocks[i] = (short *)(&s->block[j++]);
  55         else
  56             s->pblocks[i] = NULL;
  57         cbp+=cbp;
  58     }
  59 }
  60
  61 /**
  62  * This function should be called for every new field and/or frame.
  63  * It should be safe to call the function a few times for the same field.
  64  */
  65 int ff_xvmc_field_start(MpegEncContext*s, AVCodecContext *avctx)
  66 {
  67     struct xvmc_pixfmt_render *last, *next, *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
  68     const int mb_block_count = 4 + (1 << s->chroma_format);
  69
  70     assert(avctx);
  71     if (!render || render->magic_id != AV_XVMC_RENDER_MAGIC ||
  72         !render->data_blocks || !render->mv_blocks) {
  73         av_log(avctx, AV_LOG_ERROR,
  74                "Render token doesn't look as expected.\n");
  75         return -1; // make sure that this is a render packet
  76     }
  77
  78     if (render->filled_mv_blocks_num) {
  79         av_log(avctx, AV_LOG_ERROR,
  80                "Rendering surface contains %i unprocessed blocks.\n",
  81                render->filled_mv_blocks_num);
  82         return -1;
  83     }
  84     if (render->total_number_of_mv_blocks   < 1 ||
  85         render->total_number_of_data_blocks < mb_block_count) {
  86         av_log(avctx, AV_LOG_ERROR,
  87                "Rendering surface doesn't provide enough block structures to work with.\n");
  88         return -1;
  89     }
  90
  91     render->picture_structure = s->picture_structure;
  92     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
  93     render->p_future_surface  = NULL;
  94     render->p_past_surface    = NULL;
  95
  96     switch(s->pict_type) {
  97         case  FF_I_TYPE:
  98             return 0; // no prediction from other frames
  99         case  FF_B_TYPE:
 100             next = (struct xvmc_pixfmt_render*)s->next_picture.data[2];
 101             if (!next)
 102                 return -1;
 103             if (next->magic_id != AV_XVMC_RENDER_MAGIC)
 104                 return -1;
 105             render->p_future_surface = next->p_surface;
 106             // no return here, going to set forward prediction
 107         case  FF_P_TYPE:
 108             last = (struct xvmc_pixfmt_render*)s->last_picture.data[2];
 109             if (!last)
 110                 last = render; // predict second field from the first
 111             if (last->magic_id != AV_XVMC_RENDER_MAGIC)
 112                 return -1;
 113             render->p_past_surface = last->p_surface;
 114             return 0;
 115     }
 116
 117 return -1;
 118 }
 119
 120 /**
 121  * This function should be called for every new field and/or frame.
 122  * It should be safe to call the function a few times for the same field.
 123  */
 124 void ff_xvmc_field_end(MpegEncContext *s)
 125 {
 126     struct xvmc_pixfmt_render *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
 127     assert(render);
 128
 129     if (render->filled_mv_blocks_num > 0)
 130         ff_draw_horiz_band(s, 0, 0);
 131 }
 132
 133 void ff_xvmc_decode_mb(MpegEncContext *s)
 134 {
 135     XvMCMacroBlock *mv_block;
 136     struct xvmc_pixfmt_render *render;
 137     int i, cbp, blocks_per_mb;
 138
 139     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 140
 141
 142     if (s->encoding) {
 143         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 144         return;
 145     }
 146
 147     // from MPV_decode_mb(), update DC predictors for P macroblocks
 148     if (!s->mb_intra) {
 149         s->last_dc[0] =
 150         s->last_dc[1] =
 151         s->last_dc[2] =  128 << s->intra_dc_precision;
 152     }
 153
 154     // MC doesn't skip blocks
 155     s->mb_skipped = 0;
 156
 157
 158     // Do I need to export quant when I could not perform postprocessing?
 159     // Anyway, it doesn't hurt.
 160     s->current_picture.qscale_table[mb_xy] = s->qscale;
 161
 162     // start of XVMC-specific code
 163     render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
 164     assert(render);
 165     assert(render->magic_id == AV_XVMC_RENDER_MAGIC);
 166     assert(render->mv_blocks);
 167
 168     // take the next free macroblock
 169     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 170                                   render->filled_mv_blocks_num];
 171
 172     mv_block->x        = s->mb_x;
 173     mv_block->y        = s->mb_y;
 174     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 175     if (s->mb_intra) {
 176         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 177     } else {
 178         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 179
 180         if (s->mv_dir & MV_DIR_FORWARD) {
 181             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 182             // PMV[n][dir][xy] = mv[dir][n][xy]
 183             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 184             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 185             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 186             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 187         }
 188         if (s->mv_dir & MV_DIR_BACKWARD) {
 189             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 190             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 191             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 192             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 193             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 194         }
 195
 196         switch(s->mv_type) {
 197             case  MV_TYPE_16X16:
 198                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 199                 break;
 200             case  MV_TYPE_16X8:
 201                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 202                 break;
 203             case  MV_TYPE_FIELD:
 204                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 205                 if (s->picture_structure == PICT_FRAME) {
 206                     mv_block->PMV[0][0][1] <<= 1;
 207                     mv_block->PMV[1][0][1] <<= 1;
 208                     mv_block->PMV[0][1][1] <<= 1;
 209                     mv_block->PMV[1][1][1] <<= 1;
 210                 }
 211                 break;
 212             case  MV_TYPE_DMV:
 213                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 214                 if (s->picture_structure == PICT_FRAME) {
 215
 216                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 217                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 218
 219                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 220                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 221
 222                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 223                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 224
 225                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 226                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 227
 228                 } else {
 229                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 230                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 231                 }
 232                 break;
 233             default:
 234                 assert(0);
 235         }
 236
 237         mv_block->motion_vertical_field_select = 0;
 238
 239         // set correct field references
 240         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 241             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 242             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 243             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 244             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 245         }
 246     } // !intra
 247     // time to handle data blocks
 248     mv_block->index = render->next_free_data_block_num;
 249
 250     blocks_per_mb = 6;
 251     if (s->chroma_format >= 2) {
 252         blocks_per_mb = 4 + (1 << s->chroma_format);
 253     }
 254
 255     // calculate cbp
 256     cbp = 0;
 257     for (i = 0; i < blocks_per_mb; i++) {
 258         cbp += cbp;
 259         if (s->block_last_index[i] >= 0)
 260             cbp++;
 261     }
 262
 263     if (s->flags & CODEC_FLAG_GRAY) {
 264         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 265             for (i = 4; i < blocks_per_mb; i++) {
 266                 memset(s->pblocks[i], 0, sizeof(short)*64);  // so we need to clear them
 267                 if (!render->unsigned_intra)
 268                     s->pblocks[i][0] = 1 << 10;
 269             }
 270         } else {
 271             cbp &= 0xf << (blocks_per_mb - 4);
 272             blocks_per_mb = 4;                               // luminance blocks only
 273         }
 274     }
 275     mv_block->coded_block_pattern = cbp;
 276     if (cbp == 0)
 277         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 278
 279     for (i = 0; i < blocks_per_mb; i++) {
 280         if (s->block_last_index[i] >= 0) {
 281             // I do not have unsigned_intra MOCO to test, hope it is OK.
 282             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
 283                 s->pblocks[i][0] -= 1 << 10;
 284             if (!render->idct) {
 285                 s->dsp.idct(s->pblocks[i]);
 286                 /* It is unclear if MC hardware requires pixel diff values to be
 287                  * in the range [-255;255]. TODO: Clipping if such hardware is
 288                  * ever found. As of now it would only be an unnecessary
 289                  * slowdown. */
 290             }
 291             // copy blocks only if the codec doesn't support pblocks reordering
 292             if (s->avctx->xvmc_acceleration == 1) {
 293                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 294                        s->pblocks[i], sizeof(short)*64);
 295             }
 296             render->next_free_data_block_num++;
 297         }
 298     }
 299     render->filled_mv_blocks_num++;
 300
 301     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
 302     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
 303     /* The above conditions should not be able to fail as long as this function
 304      * is used and the following 'if ()' automatically calls a callback to free
 305      * blocks. */
 306
 307
 308     if (render->filled_mv_blocks_num == render->total_number_of_mv_blocks)
 309         ff_draw_horiz_band(s, 0, 0);
 310 }