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  */
  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     render->picture_structure = s->picture_structure;
  79     render->flags             = s->first_field ? 0 : XVMC_SECOND_FIELD;
  80
  81     if (render->filled_mv_blocks_num) {
  82         av_log(avctx, AV_LOG_ERROR,
  83                "Rendering surface contains %i unprocessed blocks.\n",
  84                render->filled_mv_blocks_num);
  85         return -1;
  86     }
  87     if (render->total_number_of_mv_blocks   < 1 ||
  88         render->total_number_of_data_blocks < mb_block_count) {
  89         av_log(avctx, AV_LOG_ERROR,
  90                "Rendering surface doesn't provide enough block structures to work with.\n");
  91         return -1;
  92     }
  93     if (render->total_number_of_mv_blocks   < 1 ||
  94         render->total_number_of_data_blocks < mb_block_count) {
  95         av_log(avctx, AV_LOG_ERROR,
  96                "Rendering surface doesn't provide enough block structures to work with.\n");
  97         return -1;
  98     }
  99
 100     render->p_future_surface = NULL;
 101     render->p_past_surface   = NULL;
 102
 103     switch(s->pict_type) {
 104         case  FF_I_TYPE:
 105             return 0; // no prediction from other frames
 106         case  FF_B_TYPE:
 107             next = (struct xvmc_pixfmt_render*)s->next_picture.data[2];
 108             if (!next)
 109                 return -1;
 110             if (next->magic_id != AV_XVMC_RENDER_MAGIC)
 111                 return -1;
 112             render->p_future_surface = next->p_surface;
 113             // no return here, going to set forward prediction
 114         case  FF_P_TYPE:
 115             last = (struct xvmc_pixfmt_render*)s->last_picture.data[2];
 116             if (!last)
 117                 last = render; // predict second field from the first
 118             if (last->magic_id != AV_XVMC_RENDER_MAGIC)
 119                 return -1;
 120             render->p_past_surface = last->p_surface;
 121             return 0;
 122     }
 123
 124 return -1;
 125 }
 126
 127 /**
 128  * This function should be called for every new field and/or frame.
 129  * It should be safe to call the function a few times for the same field.
 130  */
 131 void ff_xvmc_field_end(MpegEncContext *s)
 132 {
 133     struct xvmc_pixfmt_render *render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
 134     assert(render);
 135
 136     if (render->filled_mv_blocks_num > 0)
 137         ff_draw_horiz_band(s, 0, 0);
 138 }
 139
 140 void ff_xvmc_decode_mb(MpegEncContext *s)
 141 {
 142     XvMCMacroBlock *mv_block;
 143     struct xvmc_pixfmt_render *render;
 144     int i, cbp, blocks_per_mb;
 145
 146     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 147
 148
 149     if (s->encoding) {
 150         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
 151         return;
 152     }
 153
 154     // from MPV_decode_mb(), update DC predictors for P macroblocks
 155     if (!s->mb_intra) {
 156         s->last_dc[0] =
 157         s->last_dc[1] =
 158         s->last_dc[2] =  128 << s->intra_dc_precision;
 159     }
 160
 161     // MC doesn't skip blocks
 162     s->mb_skipped = 0;
 163
 164
 165     // Do I need to export quant when I could not perform postprocessing?
 166     // Anyway, it doesn't hurt.
 167     s->current_picture.qscale_table[mb_xy] = s->qscale;
 168
 169     // start of XVMC-specific code
 170     render = (struct xvmc_pixfmt_render*)s->current_picture.data[2];
 171     assert(render);
 172     assert(render->magic_id == AV_XVMC_RENDER_MAGIC);
 173     assert(render->mv_blocks);
 174
 175     // take the next free macroblock
 176     mv_block = &render->mv_blocks[render->start_mv_blocks_num +
 177                                   render->filled_mv_blocks_num];
 178
 179     mv_block->x        = s->mb_x;
 180     mv_block->y        = s->mb_y;
 181     mv_block->dct_type = s->interlaced_dct; // XVMC_DCT_TYPE_FRAME/FIELD;
 182     if (s->mb_intra) {
 183         mv_block->macroblock_type = XVMC_MB_TYPE_INTRA; // no MC, all done
 184     } else {
 185         mv_block->macroblock_type = XVMC_MB_TYPE_PATTERN;
 186
 187         if (s->mv_dir & MV_DIR_FORWARD) {
 188             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_FORWARD;
 189             // PMV[n][dir][xy] = mv[dir][n][xy]
 190             mv_block->PMV[0][0][0] = s->mv[0][0][0];
 191             mv_block->PMV[0][0][1] = s->mv[0][0][1];
 192             mv_block->PMV[1][0][0] = s->mv[0][1][0];
 193             mv_block->PMV[1][0][1] = s->mv[0][1][1];
 194         }
 195         if (s->mv_dir & MV_DIR_BACKWARD) {
 196             mv_block->macroblock_type |= XVMC_MB_TYPE_MOTION_BACKWARD;
 197             mv_block->PMV[0][1][0] = s->mv[1][0][0];
 198             mv_block->PMV[0][1][1] = s->mv[1][0][1];
 199             mv_block->PMV[1][1][0] = s->mv[1][1][0];
 200             mv_block->PMV[1][1][1] = s->mv[1][1][1];
 201         }
 202
 203         switch(s->mv_type) {
 204             case  MV_TYPE_16X16:
 205                 mv_block->motion_type = XVMC_PREDICTION_FRAME;
 206                 break;
 207             case  MV_TYPE_16X8:
 208                 mv_block->motion_type = XVMC_PREDICTION_16x8;
 209                 break;
 210             case  MV_TYPE_FIELD:
 211                 mv_block->motion_type = XVMC_PREDICTION_FIELD;
 212                 if (s->picture_structure == PICT_FRAME) {
 213                     mv_block->PMV[0][0][1] <<= 1;
 214                     mv_block->PMV[1][0][1] <<= 1;
 215                     mv_block->PMV[0][1][1] <<= 1;
 216                     mv_block->PMV[1][1][1] <<= 1;
 217                 }
 218                 break;
 219             case  MV_TYPE_DMV:
 220                 mv_block->motion_type = XVMC_PREDICTION_DUAL_PRIME;
 221                 if (s->picture_structure == PICT_FRAME) {
 222
 223                     mv_block->PMV[0][0][0] = s->mv[0][0][0];      // top from top
 224                     mv_block->PMV[0][0][1] = s->mv[0][0][1] << 1;
 225
 226                     mv_block->PMV[0][1][0] = s->mv[0][0][0];      // bottom from bottom
 227                     mv_block->PMV[0][1][1] = s->mv[0][0][1] << 1;
 228
 229                     mv_block->PMV[1][0][0] = s->mv[0][2][0];      // dmv00, top from bottom
 230                     mv_block->PMV[1][0][1] = s->mv[0][2][1] << 1; // dmv01
 231
 232                     mv_block->PMV[1][1][0] = s->mv[0][3][0];      // dmv10, bottom from top
 233                     mv_block->PMV[1][1][1] = s->mv[0][3][1] << 1; // dmv11
 234
 235                 } else {
 236                     mv_block->PMV[0][1][0] = s->mv[0][2][0];      // dmv00
 237                     mv_block->PMV[0][1][1] = s->mv[0][2][1];      // dmv01
 238                 }
 239                 break;
 240             default:
 241                 assert(0);
 242         }
 243
 244         mv_block->motion_vertical_field_select = 0;
 245
 246         // set correct field references
 247         if (s->mv_type == MV_TYPE_FIELD || s->mv_type == MV_TYPE_16X8) {
 248             mv_block->motion_vertical_field_select |= s->field_select[0][0];
 249             mv_block->motion_vertical_field_select |= s->field_select[1][0] << 1;
 250             mv_block->motion_vertical_field_select |= s->field_select[0][1] << 2;
 251             mv_block->motion_vertical_field_select |= s->field_select[1][1] << 3;
 252         }
 253     } // !intra
 254     // time to handle data blocks
 255     mv_block->index = render->next_free_data_block_num;
 256
 257     blocks_per_mb = 6;
 258     if (s->chroma_format >= 2) {
 259         blocks_per_mb = 4 + (1 << s->chroma_format);
 260     }
 261
 262     // calculate cbp
 263     cbp = 0;
 264     for (i = 0; i < blocks_per_mb; i++) {
 265         cbp += cbp;
 266         if (s->block_last_index[i] >= 0)
 267             cbp++;
 268     }
 269
 270     if (s->flags & CODEC_FLAG_GRAY) {
 271         if (s->mb_intra) {                                   // intra frames are always full chroma blocks
 272             for (i = 4; i < blocks_per_mb; i++) {
 273                 memset(s->pblocks[i], 0, sizeof(short)*64);  // so we need to clear them
 274                 if (!render->unsigned_intra)
 275                     s->pblocks[i][0] = 1 << 10;
 276             }
 277         } else {
 278             cbp &= 0xf << (blocks_per_mb - 4);
 279             blocks_per_mb = 4;                               // luminance blocks only
 280         }
 281     }
 282     mv_block->coded_block_pattern = cbp;
 283     if (cbp == 0)
 284         mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;
 285
 286     for (i = 0; i < blocks_per_mb; i++) {
 287         if (s->block_last_index[i] >= 0) {
 288             // I do not have unsigned_intra MOCO to test, hope it is OK.
 289             if (s->mb_intra && (render->idct || (!render->idct && !render->unsigned_intra)))
 290                 s->pblocks[i][0] -= 1 << 10;
 291             if (!render->idct) {
 292                 s->dsp.idct(s->pblocks[i]);
 293                 /* It is unclear if MC hardware requires pixel diff values to be
 294                  * in the range [-255;255]. TODO: Clipping if such hardware is
 295                  * ever found. As of now it would only be an unnecessary
 296                  * slowdown. */
 297             }
 298             // copy blocks only if the codec doesn't support pblocks reordering
 299             if (s->avctx->xvmc_acceleration == 1) {
 300                 memcpy(&render->data_blocks[render->next_free_data_block_num*64],
 301                        s->pblocks[i], sizeof(short)*64);
 302             }
 303             render->next_free_data_block_num++;
 304         }
 305     }
 306     render->filled_mv_blocks_num++;
 307
 308     assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
 309     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
 310     /* The above conditions should not be able to fail as long as this function
 311      * is used and the following 'if ()' automatically calls a callback to free
 312      * blocks. */
 313
 314
 315     if (render->filled_mv_blocks_num == render->total_number_of_mv_blocks)
 316         ff_draw_horiz_band(s, 0, 0);
 317 }