Libav
mpegvideo_xvmc.c
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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 
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 
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 
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 
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 
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 
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 */