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 /**
  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 the macroblock 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 <  render->allocated_mv_blocks*mb_block_count ||
  94         render->start_mv_blocks_num   >= render->allocated_mv_blocks                ||
  95         render->next_free_data_block_num >
  96                         render->allocated_data_blocks -
  97                         mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
  98         av_log(avctx, AV_LOG_ERROR,
  99                "Rendering surface doesn't provide enough block structures to work with.\n");
 100         return -1;
 101     }
 102
 103     render->picture_structure = s->picture_structure;
 104     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
 105     render->p_future_surface  = NULL;
 106     render->p_past_surface    = NULL;
 107
 108     switch(s->pict_type) {
 109         case  FF_I_TYPE:
 110             return 0; // no prediction from other frames
 111         case  FF_B_TYPE:
 112             next = (struct xvmc_pix_fmt*)s->next_picture.data[2];
 113             if (!next)
 114                 return -1;
 115             if (next->xvmc_id != AV_XVMC_ID)
 116                 return -1;
 117             render->p_future_surface = next->p_surface;
 118             // no return here, going to set forward prediction
 119         case  FF_P_TYPE:
 120             last = (struct xvmc_pix_fmt*)s->last_picture.data[2];
 121             if (!last)
 122                 last = render; // predict second field from the first
 123             if (last->xvmc_id != AV_XVMC_ID)
 124                 return -1;
 125             render->p_past_surface = last->p_surface;
 126             return 0;
 127     }
 128
 129 return -1;
 130 }
 131
 132 /**
 133  * Complete frame/field rendering by passing any remaining blocks.
 134  * Normally ff_draw_horiz_band() is called for each slice, however,
 135  * some leftover blocks, for example from error_resilience(), may remain.
 136  * It should be safe to call the function a few times for the same field.
 137  */
 138 void ff_xvmc_field_end(MpegEncContext *s)
 139 {
 140     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
 141     assert(render);
 142
 143     if (render->filled_mv_blocks_num > 0)
 144         ff_draw_horiz_band(s, 0, 0);
 145 }
 146
 147 /**
 148  * Synthesize the data needed by XvMC to render one macroblock of data.
 149  * Fill all relevant fields, if necessary do IDCT.
 150  */
 151 void ff_xvmc_decode_mb(MpegEncContext *s)
 152 {
 153     XvMCMacroBlock *mv_block;
 154     struct xvmc_pix_fmt *render;
 155     int i, cbp, blocks_per_mb;
 156
 157     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 158
 159
 160     if (s->encoding) {
 161         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 162         return;
 163     }
 164
 165     // from MPV_decode_mb(), update DC predictors for P macroblocks
 166     if (!s->mb_intra) {
 167         s->last_dc[0] =
 168         s->last_dc[1] =
 169         s->last_dc[2] =  128 << s->intra_dc_precision;
 170     }
 171
 172     // MC doesn't skip blocks
 173     s->mb_skipped = 0;
 174
 175
 176     // Do I need to export quant when I could not perform postprocessing?
 177     // Anyway, it doesn't hurt.
 178     s->current_picture.qscale_table[mb_xy] = s->qscale;
 179
 180     // start of XVMC-specific code
 181     render = (struct xvmc_pix_fmt*)s->current_picture.data[2];
 182     assert(render);
 183     assert(render->xvmc_id == AV_XVMC_ID);
 184     assert(render->mv_blocks);
 185
 186     // take the next free macroblock
 187     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 188                                   render->filled_mv_blocks_num];
 189
 190     mv_block->x        = s->mb_x;
 191     mv_block->y        = s->mb_y;
 192     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 193     if (s->mb_intra) {
 194         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 195     } else {
 196         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 197
 198         if (s->mv_dir & MV_DIR_FORWARD) {
 199             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 200             // PMV[n][dir][xy] = mv[dir][n][xy]
 201             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 202             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 203             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 204             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 205         }
 206         if (s->mv_dir & MV_DIR_BACKWARD) {
 207             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 208             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 209             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 210             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 211             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 212         }
 213
 214         switch(s->mv_type) {
 215             case  MV_TYPE_16X16:
 216                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 217                 break;
 218             case  MV_TYPE_16X8:
 219                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 220                 break;
 221             case  MV_TYPE_FIELD:
 222                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 223                 if (s->picture_structure == PICT_FRAME) {
 224                     mv_block->PMV[0][0][1] <<= 1;
 225                     mv_block->PMV[1][0][1] <<= 1;
 226                     mv_block->PMV[0][1][1] <<= 1;
 227                     mv_block->PMV[1][1][1] <<= 1;
 228                 }
 229                 break;
 230             case  MV_TYPE_DMV:
 231                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 232                 if (s->picture_structure == PICT_FRAME) {
 233
 234                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 235                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 236
 237                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 238                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 239
 240                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 241                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 242
 243                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 244                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 245
 246                 } else {
 247                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 248                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 249                 }
 250                 break;
 251             default:
 252                 assert(0);
 253         }
 254
 255         mv_block->motion_vertical_field_select = 0;
 256
 257         // set correct field references
 258         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 259             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 260             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 261             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 262             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 263         }
 264     } // !intra
 265     // time to handle data blocks
 266     mv_block->index = render->next_free_data_block_num;
 267
 268     blocks_per_mb = 6;
 269     if (s->chroma_format >= 2) {
 270         blocks_per_mb = 4 + (1 << s->chroma_format);
 271     }
 272
 273     // calculate cbp
 274     cbp = 0;
 275     for (i = 0; i < blocks_per_mb; i++) {
 276         cbp += cbp;
 277         if (s->block_last_index[i] >= 0)
 278             cbp++;
 279     }
 280
 281     if (s->flags & CODEC_FLAG_GRAY) {
 282         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 283             for (i = 4; i < blocks_per_mb; i++) {
 284                 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i])*64);  // so we need to clear them
 285                 if (!render->unsigned_intra)
 286                     s->pblocks[i][0] = 1 << 10;
 287             }
 288         } else {
 289             cbp &= 0xf << (blocks_per_mb - 4);
 290             blocks_per_mb = 4;                               // luminance blocks only
 291         }
 292     }
 293     mv_block->coded_block_pattern = cbp;
 294     if (cbp == 0)
 295         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 296
 297     for (i = 0; i < blocks_per_mb; i++) {
 298         if (s->block_last_index[i] >= 0) {
 299             // I do not have unsigned_intra MOCO to test, hope it is OK.
 300             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
 301                 s->pblocks[i][0] -= 1 << 10;
 302             if (!render->idct) {
 303                 s->dsp.idct(s->pblocks[i]);
 304                 /* It is unclear if MC hardware requires pixel diff values to be
 305                  * in the range [-255;255]. TODO: Clipping if such hardware is
 306                  * ever found. As of now it would only be an unnecessary
 307                  * slowdown. */
 308             }
 309             // copy blocks only if the codec doesn't support pblocks reordering
 310             if (s->avctx->xvmc_acceleration == 1) {
 311                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 312                        s->pblocks[i], sizeof(*s->pblocks[i])*64);
 313             }
 314             render->next_free_data_block_num++;
 315         }
 316     }
 317     render->filled_mv_blocks_num++;
 318
 319     assert(render->filled_mv_blocks_num     <= render->allocated_mv_blocks);
 320     assert(render->next_free_data_block_num <= render->allocated_data_blocks);
 321     /* The above conditions should not be able to fail as long as this function
 322      * is used and the following 'if ()' automatically calls a callback to free
 323      * blocks. */
 324
 325
 326     if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
 327         ff_draw_horiz_band(s, 0, 0);
 328 }