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 #include <X11/extensions/XvMC.h>
  24
  25 #include "avcodec.h"
  26 #include "mpegutils.h"
  27 #include "mpegvideo.h"
  28
  29 #undef NDEBUG
  30 #include <assert.h>
  31
  32 #include "xvmc.h"
  33 #include "xvmc_internal.h"
  34 #include "version.h"
  35
  36 /**
  37  * Initialize the block field of the MpegEncContext pointer passed as
  38  * parameter after making sure that the data is not corrupted.
  39  * In order to implement something like direct rendering instead of decoding
  40  * coefficients in s->blocks and then copying them, copy them directly
  41  * into the data_blocks array provided by xvmc.
  42  */
  43 void ff_xvmc_init_block(MpegEncContext *s)
  44 {
  45     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
  46     assert(render && render->xvmc_id == AV_XVMC_ID);
  47
  48     s->block = (int16_t (*)[64])(render->data_blocks + render->next_free_data_block_num * 64);
  49 }
  50
  51 static void exchange_uv(MpegEncContext *s)
  52 {
  53     int16_t (*tmp)[64];
  54
  55     tmp           = s->pblocks[4];
  56     s->pblocks[4] = s->pblocks[5];
  57     s->pblocks[5] = tmp;
  58 }
  59
  60 /**
  61  * Fill individual block pointers, so there are no gaps in the data_block array
  62  * in case not all blocks in the macroblock are coded.
  63  */
  64 void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
  65 {
  66     int i, j = 0;
  67     const int mb_block_count = 4 + (1 << s->chroma_format);
  68
  69     cbp <<= 12-mb_block_count;
  70     for (i = 0; i < mb_block_count; i++) {
  71         if (cbp & (1 << 11))
  72             s->pblocks[i] = &s->block[j++];
  73         else
  74             s->pblocks[i] = NULL;
  75         cbp += cbp;
  76     }
  77     if (s->swap_uv) {
  78         exchange_uv(s);
  79     }
  80 }
  81
  82 /**
  83  * Find and store the surfaces that are used as reference frames.
  84  * This function should be called for every new field and/or frame.
  85  * It should be safe to call the function a few times for the same field.
  86  */
  87 static int ff_xvmc_field_start(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
  88 {
  89     struct MpegEncContext *s = avctx->priv_data;
  90     struct xvmc_pix_fmt *last, *next, *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
  91     const int mb_block_count = 4 + (1 << s->chroma_format);
  92
  93     assert(avctx);
  94     if (!render || render->xvmc_id != AV_XVMC_ID ||
  95         !render->data_blocks || !render->mv_blocks ||
  96         (unsigned int)render->allocated_mv_blocks   > INT_MAX/(64*6) ||
  97         (unsigned int)render->allocated_data_blocks > INT_MAX/64     ||
  98         !render->p_surface) {
  99         av_log(avctx, AV_LOG_ERROR,
 100                "Render token doesn't look as expected.\n");
 101         return -1; // make sure that this is a render packet
 102     }
 103
 104     if (render->filled_mv_blocks_num) {
 105         av_log(avctx, AV_LOG_ERROR,
 106                "Rendering surface contains %i unprocessed blocks.\n",
 107                render->filled_mv_blocks_num);
 108         return -1;
 109     }
 110     if (render->allocated_mv_blocks   < 1 ||
 111         render->allocated_data_blocks <  render->allocated_mv_blocks*mb_block_count ||
 112         render->start_mv_blocks_num   >= render->allocated_mv_blocks                ||
 113         render->next_free_data_block_num >
 114                         render->allocated_data_blocks -
 115                         mb_block_count*(render->allocated_mv_blocks-render->start_mv_blocks_num)) {
 116         av_log(avctx, AV_LOG_ERROR,
 117                "Rendering surface doesn't provide enough block structures to work with.\n");
 118         return -1;
 119     }
 120
 121     render->picture_structure = s->picture_structure;
 122     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
 123     render->p_future_surface  = NULL;
 124     render->p_past_surface    = NULL;
 125
 126     switch(s->pict_type) {
 127         case  AV_PICTURE_TYPE_I:
 128             return 0; // no prediction from other frames
 129         case  AV_PICTURE_TYPE_B:
 130             next = (struct xvmc_pix_fmt*)s->next_picture.f->data[2];
 131             if (!next)
 132                 return -1;
 133             if (next->xvmc_id != AV_XVMC_ID)
 134                 return -1;
 135             render->p_future_surface = next->p_surface;
 136             // no return here, going to set forward prediction
 137         case  AV_PICTURE_TYPE_P:
 138             last = (struct xvmc_pix_fmt*)s->last_picture.f->data[2];
 139             if (!last)
 140                 last = render; // predict second field from the first
 141             if (last->xvmc_id != AV_XVMC_ID)
 142                 return -1;
 143             render->p_past_surface = last->p_surface;
 144             return 0;
 145     }
 146
 147 return -1;
 148 }
 149
 150 /**
 151  * Complete frame/field rendering by passing any remaining blocks.
 152  * Normally ff_draw_horiz_band() is called for each slice, however,
 153  * some leftover blocks, for example from error_resilience(), may remain.
 154  * It should be safe to call the function a few times for the same field.
 155  */
 156 static int ff_xvmc_field_end(AVCodecContext *avctx)
 157 {
 158     struct MpegEncContext *s = avctx->priv_data;
 159     struct xvmc_pix_fmt *render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
 160     assert(render);
 161
 162     if (render->filled_mv_blocks_num > 0)
 163         ff_mpeg_draw_horiz_band(s, 0, 0);
 164     return 0;
 165 }
 166
 167 /**
 168  * Synthesize the data needed by XvMC to render one macroblock of data.
 169  * Fill all relevant fields, if necessary do IDCT.
 170  */
 171 static void ff_xvmc_decode_mb(struct MpegEncContext *s)
 172 {
 173     XvMCMacroBlock *mv_block;
 174     struct xvmc_pix_fmt *render;
 175     int i, cbp, blocks_per_mb;
 176
 177     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 178
 179
 180     if (s->encoding) {
 181         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 182         return;
 183     }
 184
 185     // from ff_mpv_reconstruct_mb(), update DC predictors for P macroblocks
 186     if (!s->mb_intra) {
 187         s->last_dc[0] =
 188         s->last_dc[1] =
 189         s->last_dc[2] =  128 << s->intra_dc_precision;
 190     }
 191
 192     // MC doesn't skip blocks
 193     s->mb_skipped = 0;
 194
 195
 196     // Do I need to export quant when I could not perform postprocessing?
 197     // Anyway, it doesn't hurt.
 198     s->current_picture.qscale_table[mb_xy] = s->qscale;
 199
 200     // start of XVMC-specific code
 201     render = (struct xvmc_pix_fmt*)s->current_picture.f->data[2];
 202     assert(render);
 203     assert(render->xvmc_id == AV_XVMC_ID);
 204     assert(render->mv_blocks);
 205
 206     // take the next free macroblock
 207     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 208                                   render->filled_mv_blocks_num];
 209
 210     mv_block->x        = s->mb_x;
 211     mv_block->y        = s->mb_y;
 212     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 213     if (s->mb_intra) {
 214         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 215     } else {
 216         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 217
 218         if (s->mv_dir & MV_DIR_FORWARD) {
 219             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 220             // PMV[n][dir][xy] = mv[dir][n][xy]
 221             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 222             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 223             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 224             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 225         }
 226         if (s->mv_dir & MV_DIR_BACKWARD) {
 227             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 228             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 229             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 230             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 231             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 232         }
 233
 234         switch(s->mv_type) {
 235             case  MV_TYPE_16X16:
 236                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 237                 break;
 238             case  MV_TYPE_16X8:
 239                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 240                 break;
 241             case  MV_TYPE_FIELD:
 242                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 243                 if (s->picture_structure == PICT_FRAME) {
 244                     mv_block->PMV[0][0][1] <<= 1;
 245                     mv_block->PMV[1][0][1] <<= 1;
 246                     mv_block->PMV[0][1][1] <<= 1;
 247                     mv_block->PMV[1][1][1] <<= 1;
 248                 }
 249                 break;
 250             case  MV_TYPE_DMV:
 251                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 252                 if (s->picture_structure == PICT_FRAME) {
 253
 254                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 255                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 256
 257                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 258                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 259
 260                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 261                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 262
 263                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 264                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 265
 266                 } else {
 267                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 268                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 269                 }
 270                 break;
 271             default:
 272                 assert(0);
 273         }
 274
 275         mv_block->motion_vertical_field_select = 0;
 276
 277         // set correct field references
 278         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 279             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 280             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 281             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 282             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 283         }
 284     } // !intra
 285     // time to handle data blocks
 286     mv_block->index = render->next_free_data_block_num;
 287
 288     blocks_per_mb = 6;
 289     if (s->chroma_format >= 2) {
 290         blocks_per_mb = 4 + (1 << s->chroma_format);
 291     }
 292
 293     // calculate cbp
 294     cbp = 0;
 295     for (i = 0; i < blocks_per_mb; i++) {
 296         cbp += cbp;
 297         if (s->block_last_index[i] >= 0)
 298             cbp++;
 299     }
 300
 301     if (s->avctx->flags & AV_CODEC_FLAG_GRAY) {
 302         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 303             for (i = 4; i < blocks_per_mb; i++) {
 304                 memset(s->pblocks[i], 0, sizeof(*s->pblocks[i]));  // so we need to clear them
 305                 if (!render->unsigned_intra)
 306                     *s->pblocks[i][0] = 1 << 10;
 307             }
 308         } else {
 309             cbp &= 0xf << (blocks_per_mb - 4);
 310             blocks_per_mb = 4;                               // luminance blocks only
 311         }
 312     }
 313     mv_block->coded_block_pattern = cbp;
 314     if (cbp == 0)
 315         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 316
 317     for (i = 0; i < blocks_per_mb; i++) {
 318         if (s->block_last_index[i] >= 0) {
 319             // I do not have unsigned_intra MOCO to test, hope it is OK.
 320             if (s->mb_intra && (render->idct || !render->unsigned_intra))
 321                 *s->pblocks[i][0] -= 1 << 10;
 322             if (!render->idct) {
 323                 s->idsp.idct(*s->pblocks[i]);
 324                 /* It is unclear if MC hardware requires pixel diff values to be
 325                  * in the range [-255;255]. TODO: Clipping if such hardware is
 326                  * ever found. As of now it would only be an unnecessary
 327                  * slowdown. */
 328             }
 329             // copy blocks only if the codec doesn't support pblocks reordering
 330             if (!s->pack_pblocks) {
 331                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 332                        s->pblocks[i], sizeof(*s->pblocks[i]));
 333             }
 334             render->next_free_data_block_num++;
 335         }
 336     }
 337     render->filled_mv_blocks_num++;
 338
 339     assert(render->filled_mv_blocks_num     <= render->allocated_mv_blocks);
 340     assert(render->next_free_data_block_num <= render->allocated_data_blocks);
 341     /* The above conditions should not be able to fail as long as this function
 342      * is used and the following 'if ()' automatically calls a callback to free
 343      * blocks. */
 344
 345
 346     if (render->filled_mv_blocks_num == render->allocated_mv_blocks)
 347         ff_mpeg_draw_horiz_band(s, 0, 0);
 348 }
 349
 350 #if CONFIG_MPEG1_XVMC_HWACCEL
 351 AVHWAccel ff_mpeg1_xvmc_hwaccel = {
 352     .name           = "mpeg1_xvmc",
 353     .type           = AVMEDIA_TYPE_VIDEO,
 354     .id             = AV_CODEC_ID_MPEG1VIDEO,
 355     .pix_fmt        = AV_PIX_FMT_XVMC,
 356     .start_frame    = ff_xvmc_field_start,
 357     .end_frame      = ff_xvmc_field_end,
 358     .decode_slice   = NULL,
 359     .decode_mb      = ff_xvmc_decode_mb,
 360     .priv_data_size = 0,
 361 };
 362 #endif
 363
 364 #if CONFIG_MPEG2_XVMC_HWACCEL
 365 AVHWAccel ff_mpeg2_xvmc_hwaccel = {
 366     .name           = "mpeg2_xvmc",
 367     .type           = AVMEDIA_TYPE_VIDEO,
 368     .id             = AV_CODEC_ID_MPEG2VIDEO,
 369     .pix_fmt        = AV_PIX_FMT_XVMC,
 370     .start_frame    = ff_xvmc_field_start,
 371     .end_frame      = ff_xvmc_field_end,
 372     .decode_slice   = NULL,
 373     .decode_mb      = ff_xvmc_decode_mb,
 374     .priv_data_size = 0,
 375 };
 376 #endif