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  * In order to implement something like direct rendering instead of decoding
  38  * coefficients in s->blocks and then copying them, copy them directly
  39  * into the data_blocks array provided by xvmc.
  40  */
  41 void ff_xvmc_init_block(MpegEncContext *s)
  42 {
  43     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
  44     assert(render && render->xvmc_id == AV_XVMC_ID);
  45
  46     s->block = (DCTELEM *)(render->data_blocks + render->next_free_data_block_num * 64);
  47 }
  48
  49 /**
  50  * Fill individual block pointers, so there are no gaps in the data_block array
  51  * in case not all blocks in MB are coded.
  52  */
  53 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
  54 {
  55     int i, j = 0;
  56     const int mb_block_count = 4 + (1 << s->chroma_format);
  57
  58     cbp <<= 12-mb_block_count;
  59     for (i = 0; i < mb_block_count; i++) {
  60         if (cbp & (1 << 11))
  61             s->pblocks[i] = (short *)(&s->block[j++]);
  62         else
  63             s->pblocks[i] = NULL;
  64         cbp+=cbp;
  65     }
  66 }
  67
  68 /**
  69  * Find and store the surfaces that are used as reference frames.
  70  * This function should be called for every new field and/or frame.
  71  * It should be safe to call the function a few times for the same field.
  72  */
  73 int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
  74 {
  75     struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
  76     const int mb_block_count = 4 + (1 << s->chroma_format);
  77
  78     assert(avctx);
  79     if (!render || render->xvmc_id != AV_XVMC_ID ||
  80         !render->data_blocks || !render->mv_blocks) {
  81         av_log(avctx, AV_LOG_ERROR,
  82                "Render token doesn't look as expected.\n");
  83         return -1; // make sure that this is a render packet
  84     }
  85
  86     if (render->filled_mv_blocks_num) {
  87         av_log(avctx, AV_LOG_ERROR,
  88                "Rendering surface contains %i unprocessed blocks.\n",
  89                render->filled_mv_blocks_num);
  90         return -1;
  91     }
  92     if (render->allocated_mv_blocks   < 1 ||
  93         render->allocated_data_blocks < mb_block_count) {
  94         av_log(avctx, AV_LOG_ERROR,
  95                "Rendering surface doesn't provide enough block structures to work with.\n");
  96         return -1;
  97     }
  98
  99     render->picture_structure = s->picture_structure;
 100     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
 101     render->p_future_surface  = NULL;
 102     render->p_past_surface    = NULL;
 103
 104     switch(s->pict_type) {
 105         case  FF_I_TYPE:
 106             return 0; // no prediction from other frames
 107         case  FF_B_TYPE:
 108             next = (struct xvmc_pix_fmt*)s->next_picture.data[2];
 109             if (!next)
 110                 return -1;
 111             if (next->xvmc_id != AV_XVMC_ID)
 112                 return -1;
 113             render->p_future_surface = next->p_surface;
 114             // no return here, going to set forward prediction
 115         case  FF_P_TYPE:
 116             last = (struct xvmc_pix_fmt*)s->last_picture.data[2];
 117             if (!last)
 118                 last = render; // predict second field from the first
 119             if (last->xvmc_id != AV_XVMC_ID)
 120                 return -1;
 121             render->p_past_surface = last->p_surface;
 122             return 0;
 123     }
 124
 125 return -1;
 126 }
 127
 128 /**
 129  * Complete frame/field rendering by passing any remaining blocks.
 130  * Normally ff_draw_horiz_band() is called for each slice, however,
 131  * some leftover blocks, for example from error_resilience(), may remain.
 132  * It should be safe to call the function a few times for the same field.
 133  */
 134 void ff_xvmc_field_end(MpegEncContext *s)
 135 {
 136     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
 137     assert(render);
 138
 139     if (render->filled_mv_blocks_num > 0)
 140         ff_draw_horiz_band(s, 0, 0);
 141 }
 142
 143 /**
 144  * Synthesize the data needed by XvMC to render one macroblock of data.
 145  * Fill all relevant fields, if necessary do IDCT.
 146  */
 147 void ff_xvmc_decode_mb(MpegEncContext *s)
 148 {
 149     XvMCMacroBlock *mv_block;
 150     struct xvmc_pix_fmt *render;
 151     int i, cbp, blocks_per_mb;
 152
 153     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 154
 155
 156     if (s->encoding) {
 157         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 158         return;
 159     }
 160
 161     // from MPV_decode_mb(), update DC predictors for P macroblocks
 162     if (!s->mb_intra) {
 163         s->last_dc[0] =
 164         s->last_dc[1] =
 165         s->last_dc[2] =  128 << s->intra_dc_precision;
 166     }
 167
 168     // MC doesn't skip blocks
 169     s->mb_skipped = 0;
 170
 171
 172     // Do I need to export quant when I could not perform postprocessing?
 173     // Anyway, it doesn't hurt.
 174     s->current_picture.qscale_table[mb_xy] = s->qscale;
 175
 176     // start of XVMC-specific code
 177     render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
 178     assert(render);
 179     assert(render->xvmc_id == AV_XVMC_ID);
 180     assert(render->mv_blocks);
 181
 182     // take the next free macroblock
 183     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 184                                   render->filled_mv_blocks_num];
 185
 186     mv_block->x        = s->mb_x;
 187     mv_block->y        = s->mb_y;
 188     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 189     if (s->mb_intra) {
 190         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 191     } else {
 192         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 193
 194         if (s->mv_dir & MV_DIR_FORWARD) {
 195             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 196             // PMV[n][dir][xy] = mv[dir][n][xy]
 197             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 198             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 199             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 200             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 201         }
 202         if (s->mv_dir & MV_DIR_BACKWARD) {
 203             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 204             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 205             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 206             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 207             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 208         }
 209
 210         switch(s->mv_type) {
 211             case  MV_TYPE_16X16:
 212                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 213                 break;
 214             case  MV_TYPE_16X8:
 215                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 216                 break;
 217             case  MV_TYPE_FIELD:
 218                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 219                 if (s->picture_structure == PICT_FRAME) {
 220                     mv_block->PMV[0][0][1] <<= 1;
 221                     mv_block->PMV[1][0][1] <<= 1;
 222                     mv_block->PMV[0][1][1] <<= 1;
 223                     mv_block->PMV[1][1][1] <<= 1;
 224                 }
 225                 break;
 226             case  MV_TYPE_DMV:
 227                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 228                 if (s->picture_structure == PICT_FRAME) {
 229
 230                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 231                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 232
 233                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 234                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 235
 236                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 237                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 238
 239                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 240                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 241
 242                 } else {
 243                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 244                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 245                 }
 246                 break;
 247             default:
 248                 assert(0);
 249         }
 250
 251         mv_block->motion_vertical_field_select = 0;
 252
 253         // set correct field references
 254         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 255             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 256             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 257             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 258             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 259         }
 260     } // !intra
 261     // time to handle data blocks
 262     mv_block->index = render->next_free_data_block_num;
 263
 264     blocks_per_mb = 6;
 265     if (s->chroma_format >= 2) {
 266         blocks_per_mb = 4 + (1 << s->chroma_format);
 267     }
 268
 269     // calculate cbp
 270     cbp = 0;
 271     for (i = 0; i < blocks_per_mb; i++) {
 272         cbp += cbp;
 273         if (s->block_last_index[i] >= 0)
 274             cbp++;
 275     }
 276
 277     if (s->flags & CODEC_FLAG_GRAY) {
 278         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 279             for (i = 4; i < blocks_per_mb; i++) {
 280                 memset(s->pblocks[i], 0, sizeof(short)*64);  // so we need to clear them
 281                 if (!render->unsigned_intra)
 282                     s->pblocks[i][0] = 1 << 10;
 283             }
 284         } else {
 285             cbp &= 0xf << (blocks_per_mb - 4);
 286             blocks_per_mb = 4;                               // luminance blocks only
 287         }
 288     }
 289     mv_block->coded_block_pattern = cbp;
 290     if (cbp == 0)
 291         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 292
 293     for (i = 0; i < blocks_per_mb; i++) {
 294         if (s->block_last_index[i] >= 0) {
 295             // I do not have unsigned_intra MOCO to test, hope it is OK.
 296             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
 297                 s->pblocks[i][0] -= 1 << 10;
 298             if (!render->idct) {
 299                 s->dsp.idct(s->pblocks[i]);
 300                 /* It is unclear if MC hardware requires pixel diff values to be
 301                  * in the range [-255;255]. TODO: Clipping if such hardware is
 302                  * ever found. As of now it would only be an unnecessary
 303                  * slowdown. */
 304             }
 305             // copy blocks only if the codec doesn't support pblocks reordering
 306             if (s->avctx->xvmc_acceleration == 1) {
 307                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 308                        s->pblocks[i], sizeof(short)*64);
 309             }
 310             render->next_free_data_block_num++;
 311         }
 312     }
 313     render->filled_mv_blocks_num++;
 314
 315
 316     if (render->filled_mv_blocks_num > render->allocated_mv_blocks)
 317         av_log(s->avctx, AV_LOG_ERROR,
 318                "Not enough space to store mv blocks allocated.\n");
 319
 320     if (render->next_free_data_block_num > render->allocated_data_blocks)
 321         av_log(s->avctx, AV_LOG_ERROR,
 322                "Offset to next data block exceeds number of allocated data blocks.\n");
 323
 324
 325     if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
 326         ff_draw_horiz_band(s, 0, 0);
 327 }