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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 #include <X11/extensions/XvMC.h>
  24
  25 #include "avcodec.h"
  26 #include "mpegvideo.h"
  27
  28 #undef NDEBUG
  29 #include <assert.h>
  30
  31 #include "xvmc.h"
  32 #include "xvmc_internal.h"
  33 #include "version.h"
  34
  35 #if FF_API_XVMC
  36
  37 /**
  38  * Initialize the block field of the MpegEncContext pointer passed as
  39  * parameter after making sure that the data is not corrupted.
  40  * In order to implement something like direct rendering instead of decoding
  41  * coefficients in s->blocks and then copying them, copy them directly
  42  * into the data_blocks array provided by xvmc.
  43  */
  44 void ff_xvmc_init_block(MpegEncContext *s)
  45 {
  46     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
  47     assert(render && render->xvmc_id == AV_XVMC_ID);
  48
  49     s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
  50 }
  51
  52 /**
  53  * Fill individual block pointers, so there are no gaps in the data_block array
  54  * in case not all blocks in the macroblock are coded.
  55  */
  56 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
  57 {
  58     int i, j = 0;
  59     const int mb_block_count = 4 + (1 << s->chroma_format);
  60
  61     cbp <<= 12-mb_block_count;
  62     for (i = 0; i < mb_block_count; i++) {
  63         if (cbp & (1 << 11))
  64             s->pblocks[i] = &s->block[j++];
  65         else
  66             s->pblocks[i] = NULL;
  67         cbp += cbp;
  68     }
  69 }
  70
  71 /**
  72  * Find and store the surfaces that are used as reference frames.
  73  * This function should be called for every new field and/or frame.
  74  * It should be safe to call the function a few times for the same field.
  75  */
  76 int ff_xvmc_field_start(MpegEncContext *s, AVCodecContext *avctx)
  77 {
  78     struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
  79     const int mb_block_count = 4 + (1 << s->chroma_format);
  80
  81     assert(avctx);
  82     if (!render || render->xvmc_id != AV_XVMC_ID ||
  83         !render->data_blocks || !render->mv_blocks ||
  84         (unsigned int)render->allocated_mv_blocks   > INT_MAX/(64*6) ||
  85         (unsigned int)render->allocated_data_blocks > INT_MAX/64     ||
  86         !render->p_surface) {
  87         av_log(avctx, AV_LOG_ERROR,
  88                "Render token doesn't look as expected.\n");
  89         return -1; // make sure that this is a render packet
  90     }
  91
  92     if (render->filled_mv_blocks_num) {
  93         av_log(avctx, AV_LOG_ERROR,
  94                "Rendering surface contains %i unprocessed blocks.\n",
  95                render->filled_mv_blocks_num);
  96         return -1;
  97     }
  98     if (render->allocated_mv_blocks   < 1 ||
  99         render->allocated_data_blocks <  render->allocated_mv_blocks*mb_block_count ||
 100         render->start_mv_blocks_num   >= render->allocated_mv_blocks                ||
 101         render->next_free_data_block_num >
 102                         render->allocated_data_blocks -
 103                         mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
 104         av_log(avctx, AV_LOG_ERROR,
 105                "Rendering surface doesn't provide enough block structures to work with.\n");
 106         return -1;
 107     }
 108
 109     render->picture_structure = s->picture_structure;
 110     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
 111     render->p_future_surface  = NULL;
 112     render->p_past_surface    = NULL;
 113
 114     switch(s->pict_type) {
 115         case  AV_PICTURE_TYPE_I:
 116             return 0; // no prediction from other frames
 117         case  AV_PICTURE_TYPE_B:
 118             next = (struct xvmc_pix_fmt*)s->next_picture.f.data[2];
 119             if (!next)
 120                 return -1;
 121             if (next->xvmc_id != AV_XVMC_ID)
 122                 return -1;
 123             render->p_future_surface = next->p_surface;
 124             // no return here, going to set forward prediction
 125         case  AV_PICTURE_TYPE_P:
 126             last = (struct xvmc_pix_fmt*)s->last_picture.f.data[2];
 127             if (!last)
 128                 last = render; // predict second field from the first
 129             if (last->xvmc_id != AV_XVMC_ID)
 130                 return -1;
 131             render->p_past_surface = last->p_surface;
 132             return 0;
 133     }
 134
 135 return -1;
 136 }
 137
 138 /**
 139  * Complete frame/field rendering by passing any remaining blocks.
 140  * Normally ff_draw_horiz_band() is called for each slice, however,
 141  * some leftover blocks, for example from error_resilience(), may remain.
 142  * It should be safe to call the function a few times for the same field.
 143  */
 144 void ff_xvmc_field_end(MpegEncContext *s)
 145 {
 146     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
 147     assert(render);
 148
 149     if (render->filled_mv_blocks_num > 0)
 150         ff_mpeg_draw_horiz_band(s, 0, 0);
 151 }
 152
 153 /**
 154  * Synthesize the data needed by XvMC to render one macroblock of data.
 155  * Fill all relevant fields, if necessary do IDCT.
 156  */
 157 void ff_xvmc_decode_mb(MpegEncContext *s)
 158 {
 159     XvMCMacroBlock *mv_block;
 160     struct xvmc_pix_fmt *render;
 161     int i, cbp, blocks_per_mb;
 162
 163     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 164
 165
 166     if (s->encoding) {
 167         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 168         return;
 169     }
 170
 171     // from MPV_decode_mb(), update DC predictors for P macroblocks
 172     if (!s->mb_intra) {
 173         s->last_dc[0] =
 174         s->last_dc[1] =
 175         s->last_dc[2] =  128 << s->intra_dc_precision;
 176     }
 177
 178     // MC doesn't skip blocks
 179     s->mb_skipped = 0;
 180
 181
 182     // Do I need to export quant when I could not perform postprocessing?
 183     // Anyway, it doesn't hurt.
 184     s->current_picture.qscale_table[mb_xy] = s->qscale;
 185
 186     // start of XVMC-specific code
 187     render = (struct xvmc_pix_fmt*)s->current_picture.f.data[2];
 188     assert(render);
 189     assert(render->xvmc_id == AV_XVMC_ID);
 190     assert(render->mv_blocks);
 191
 192     // take the next free macroblock
 193     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 194                                   render->filled_mv_blocks_num];
 195
 196     mv_block->x        = s->mb_x;
 197     mv_block->y        = s->mb_y;
 198     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 199     if (s->mb_intra) {
 200         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 201     } else {
 202         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 203
 204         if (s->mv_dir & MV_DIR_FORWARD) {
 205             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 206             // PMV[n][dir][xy] = mv[dir][n][xy]
 207             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 208             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 209             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 210             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 211         }
 212         if (s->mv_dir & MV_DIR_BACKWARD) {
 213             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 214             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 215             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 216             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 217             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 218         }
 219
 220         switch(s->mv_type) {
 221             case  MV_TYPE_16X16:
 222                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 223                 break;
 224             case  MV_TYPE_16X8:
 225                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 226                 break;
 227             case  MV_TYPE_FIELD:
 228                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 229                 if (s->picture_structure == PICT_FRAME) {
 230                     mv_block->PMV[0][0][1] <<= 1;
 231                     mv_block->PMV[1][0][1] <<= 1;
 232                     mv_block->PMV[0][1][1] <<= 1;
 233                     mv_block->PMV[1][1][1] <<= 1;
 234                 }
 235                 break;
 236             case  MV_TYPE_DMV:
 237                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 238                 if (s->picture_structure == PICT_FRAME) {
 239
 240                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 241                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 242
 243                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 244                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 245
 246                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 247                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 248
 249                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 250                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 251
 252                 } else {
 253                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 254                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 255                 }
 256                 break;
 257             default:
 258                 assert(0);
 259         }
 260
 261         mv_block->motion_vertical_field_select = 0;
 262
 263         // set correct field references
 264         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 265             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 266             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 267             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 268             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 269         }
 270     } // !intra
 271     // time to handle data blocks
 272     mv_block->index = render->next_free_data_block_num;
 273
 274     blocks_per_mb = 6;
 275     if (s->chroma_format >= 2) {
 276         blocks_per_mb = 4 + (1 << s->chroma_format);
 277     }
 278
 279     // calculate cbp
 280     cbp = 0;
 281     for (i = 0; i < blocks_per_mb; i++) {
 282         cbp += cbp;
 283         if (s->block_last_index[i] >= 0)
 284             cbp++;
 285     }
 286
 287     if (s->flags & CODEC_FLAG_GRAY) {
 288         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 289             for (i = 4; i < blocks_per_mb; i++) {
 290                 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i]));  // so we need to clear them
 291                 if (!render->unsigned_intra)
 292                     *s->pblocks[i][0] = 1 << 10;
 293             }
 294         } else {
 295             cbp &= 0xf << (blocks_per_mb - 4);
 296             blocks_per_mb = 4;                               // luminance blocks only
 297         }
 298     }
 299     mv_block->coded_block_pattern = cbp;
 300     if (cbp == 0)
 301         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 302
 303     for (i = 0; i < blocks_per_mb; i++) {
 304         if (s->block_last_index[i] >= 0) {
 305             // I do not have unsigned_intra MOCO to test, hope it is OK.
 306             if (s->mb_intra && (render->idct || !render->unsigned_intra))
 307                 *s->pblocks[i][0] -= 1 << 10;
 308             if (!render->idct) {
 309                 s->dsp.idct(*s->pblocks[i]);
 310                 /* It is unclear if MC hardware requires pixel diff values to be
 311                  * in the range [-255;255]. TODO: Clipping if such hardware is
 312                  * ever found. As of now it would only be an unnecessary
 313                  * slowdown. */
 314             }
 315             // copy blocks only if the codec doesn't support pblocks reordering
 316             if (s->avctx->xvmc_acceleration == 1) {
 317                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 318                        s->pblocks[i], sizeof(*s->pblocks[i]));
 319             }
 320             render->next_free_data_block_num++;
 321         }
 322     }
 323     render->filled_mv_blocks_num++;
 324
 325     assert(render->filled_mv_blocks_num     <= render->allocated_mv_blocks);
 326     assert(render->next_free_data_block_num <= render->allocated_data_blocks);
 327     /* The above conditions should not be able to fail as long as this function
 328      * is used and the following 'if ()' automatically calls a callback to free
 329      * blocks. */
 330
 331
 332     if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
 333         ff_mpeg_draw_horiz_band(s, 0, 0);
 334 }
 335
 336 #endif /* FF_API_XVMC */