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dxva2_h264.c
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1 /*
2  * DXVA2 H264 HW acceleration.
3  *
4  * copyright (c) 2009 Laurent Aimar
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "dxva2_internal.h"
24 #include "h264.h"
25 #include "h264data.h"
26 #include "mpegutils.h"
27 
29  DXVA_PicParams_H264 pp;
30  DXVA_Qmatrix_H264 qm;
31  unsigned slice_count;
32  DXVA_Slice_H264_Short slice_short[MAX_SLICES];
33  DXVA_Slice_H264_Long slice_long[MAX_SLICES];
35  unsigned bitstream_size;
36 };
37 
38 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
39  unsigned index, unsigned flag)
40 {
41  assert((index&0x7f) == index && (flag&0x01) == flag);
42  pic->bPicEntry = index | (flag << 7);
43 }
44 
45 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
46  DXVA_PicParams_H264 *pp)
47 {
48  const H264Picture *current_picture = h->cur_pic_ptr;
49  int i, j;
50 
51  memset(pp, 0, sizeof(*pp));
52  /* Configure current picture */
53  fill_picture_entry(&pp->CurrPic,
54  ff_dxva2_get_surface_index(ctx, &current_picture->f),
56  /* Configure the set of references */
57  pp->UsedForReferenceFlags = 0;
58  pp->NonExistingFrameFlags = 0;
59  for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
60  const H264Picture *r;
61  if (j < h->short_ref_count) {
62  r = h->short_ref[j++];
63  } else {
64  r = NULL;
65  while (!r && j < h->short_ref_count + 16)
66  r = h->long_ref[j++ - h->short_ref_count];
67  }
68  if (r) {
69  fill_picture_entry(&pp->RefFrameList[i],
70  ff_dxva2_get_surface_index(ctx, &r->f),
71  r->long_ref != 0);
72 
73  if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
74  pp->FieldOrderCntList[i][0] = r->field_poc[0];
75  if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
76  pp->FieldOrderCntList[i][1] = r->field_poc[1];
77 
78  pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
79  if (r->reference & PICT_TOP_FIELD)
80  pp->UsedForReferenceFlags |= 1 << (2*i + 0);
82  pp->UsedForReferenceFlags |= 1 << (2*i + 1);
83  } else {
84  pp->RefFrameList[i].bPicEntry = 0xff;
85  pp->FieldOrderCntList[i][0] = 0;
86  pp->FieldOrderCntList[i][1] = 0;
87  pp->FrameNumList[i] = 0;
88  }
89  }
90 
91  pp->wFrameWidthInMbsMinus1 = h->mb_width - 1;
92  pp->wFrameHeightInMbsMinus1 = h->mb_height - 1;
93  pp->num_ref_frames = h->sps.ref_frame_count;
94 
95  pp->wBitFields = ((h->picture_structure != PICT_FRAME) << 0) |
96  ((h->sps.mb_aff &&
97  (h->picture_structure == PICT_FRAME)) << 1) |
99  /* sp_for_switch_flag (not implemented by FFmpeg) */
100  (0 << 3) |
101  (h->sps.chroma_format_idc << 4) |
102  ((h->nal_ref_idc != 0) << 6) |
103  (h->pps.constrained_intra_pred << 7) |
104  (h->pps.weighted_pred << 8) |
105  (h->pps.weighted_bipred_idc << 9) |
106  /* MbsConsecutiveFlag */
107  (1 << 11) |
108  (h->sps.frame_mbs_only_flag << 12) |
109  (h->pps.transform_8x8_mode << 13) |
110  ((h->sps.level_idc >= 31) << 14) |
111  /* IntraPicFlag (Modified if we detect a non
112  * intra slice in dxva2_h264_decode_slice) */
113  (1 << 15);
114 
115  pp->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
116  pp->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
118  pp->Reserved16Bits = 0;
120  pp->Reserved16Bits = 0x34c;
121  else
122  pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
123  pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
124  pp->CurrFieldOrderCnt[0] = 0;
125  if ((h->picture_structure & PICT_TOP_FIELD) &&
126  current_picture->field_poc[0] != INT_MAX)
127  pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
128  pp->CurrFieldOrderCnt[1] = 0;
130  current_picture->field_poc[1] != INT_MAX)
131  pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
132  pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
133  pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
134  pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
135  pp->ContinuationFlag = 1;
136  pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
137  pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
138  pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
139  pp->Reserved8BitsA = 0;
140  pp->frame_num = h->frame_num;
141  pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
142  pp->pic_order_cnt_type = h->sps.poc_type;
143  if (h->sps.poc_type == 0)
144  pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
145  else if (h->sps.poc_type == 1)
146  pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
147  pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
148  pp->entropy_coding_mode_flag = h->pps.cabac;
149  pp->pic_order_present_flag = h->pps.pic_order_present;
150  pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
151  pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
152  pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
153  pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
154  pp->Reserved8BitsB = 0;
155  pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by FFmpeg */
156  //pp->SliceGroupMap[810]; /* XXX not implemented by FFmpeg */
157 }
158 
159 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
160 {
161  unsigned i, j;
162  memset(qm, 0, sizeof(*qm));
164  for (i = 0; i < 6; i++)
165  for (j = 0; j < 16; j++)
166  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
167 
168  for (i = 0; i < 64; i++) {
169  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
170  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
171  }
172  } else {
173  for (i = 0; i < 6; i++)
174  for (j = 0; j < 16; j++)
175  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
176 
177  for (i = 0; i < 64; i++) {
178  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
179  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
180  }
181  }
182 }
183 
184 static int is_slice_short(struct dxva_context *ctx)
185 {
186  assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
187  ctx->cfg->ConfigBitstreamRaw == 2);
188  return ctx->cfg->ConfigBitstreamRaw == 2;
189 }
190 
191 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
192  unsigned position, unsigned size)
193 {
194  memset(slice, 0, sizeof(*slice));
195  slice->BSNALunitDataLocation = position;
196  slice->SliceBytesInBuffer = size;
197  slice->wBadSliceChopping = 0;
198 }
199 
200 static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
201 {
202  int i;
203  for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
204  if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
205  return i;
206  }
207  return 0x7f;
208 }
209 
210 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
211  const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
212 {
213  const H264Context *h = avctx->priv_data;
214  struct dxva_context *ctx = avctx->hwaccel_context;
215  unsigned list;
216 
217  memset(slice, 0, sizeof(*slice));
218  slice->BSNALunitDataLocation = position;
219  slice->SliceBytesInBuffer = size;
220  slice->wBadSliceChopping = 0;
221 
222  slice->first_mb_in_slice = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
223  slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
224  slice->BitOffsetToSliceData = get_bits_count(&h->gb);
225  slice->slice_type = ff_h264_get_slice_type(h);
226  if (h->slice_type_fixed)
227  slice->slice_type += 5;
228  slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
229  slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
230  if (h->list_count > 0)
231  slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
232  if (h->list_count > 1)
233  slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
234  slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2;
235  slice->slice_beta_offset_div2 = h->slice_beta_offset / 2;
236  slice->Reserved8Bits = 0;
237 
238  for (list = 0; list < 2; list++) {
239  unsigned i;
240  for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
241  if (list < h->list_count && i < h->ref_count[list]) {
242  const H264Picture *r = &h->ref_list[list][i];
243  unsigned plane;
244  unsigned index;
246  index = ff_dxva2_get_surface_index(ctx, &r->f);
247  else
248  index = get_refpic_index(pp, ff_dxva2_get_surface_index(ctx, &r->f));
249  fill_picture_entry(&slice->RefPicList[list][i], index,
251  for (plane = 0; plane < 3; plane++) {
252  int w, o;
253  if (plane == 0 && h->luma_weight_flag[list]) {
254  w = h->luma_weight[i][list][0];
255  o = h->luma_weight[i][list][1];
256  } else if (plane >= 1 && h->chroma_weight_flag[list]) {
257  w = h->chroma_weight[i][list][plane-1][0];
258  o = h->chroma_weight[i][list][plane-1][1];
259  } else {
260  w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
262  o = 0;
263  }
264  slice->Weights[list][i][plane][0] = w;
265  slice->Weights[list][i][plane][1] = o;
266  }
267  } else {
268  unsigned plane;
269  slice->RefPicList[list][i].bPicEntry = 0xff;
270  for (plane = 0; plane < 3; plane++) {
271  slice->Weights[list][i][plane][0] = 0;
272  slice->Weights[list][i][plane][1] = 0;
273  }
274  }
275  }
276  }
277  slice->slice_qs_delta = 0; /* XXX not implemented by FFmpeg */
278  slice->slice_qp_delta = h->qscale - h->pps.init_qp;
279  slice->redundant_pic_cnt = h->redundant_pic_count;
280  if (h->slice_type == AV_PICTURE_TYPE_B)
281  slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
282  slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
283  if (h->deblocking_filter < 2)
284  slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
285  else
286  slice->disable_deblocking_filter_idc = h->deblocking_filter;
287  slice->slice_id = h->current_slice - 1;
288 }
289 
291  DXVA2_DecodeBufferDesc *bs,
292  DXVA2_DecodeBufferDesc *sc)
293 {
294  const H264Context *h = avctx->priv_data;
295  const unsigned mb_count = h->mb_width * h->mb_height;
296  struct dxva_context *ctx = avctx->hwaccel_context;
297  const H264Picture *current_picture = h->cur_pic_ptr;
298  struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
299  DXVA_Slice_H264_Short *slice = NULL;
300  uint8_t *dxva_data, *current, *end;
301  unsigned dxva_size;
302  void *slice_data;
303  unsigned slice_size;
304  unsigned padding;
305  unsigned i;
306 
307  /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
308  if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
309  DXVA2_BitStreamDateBufferType,
310  (void **)&dxva_data, &dxva_size)))
311  return -1;
312  current = dxva_data;
313  end = dxva_data + dxva_size;
314 
315  for (i = 0; i < ctx_pic->slice_count; i++) {
316  static const uint8_t start_code[] = { 0, 0, 1 };
317  static const unsigned start_code_size = sizeof(start_code);
318  unsigned position, size;
319 
320  assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
321  offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
322  assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
323  offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
324 
325  if (is_slice_short(ctx))
326  slice = &ctx_pic->slice_short[i];
327  else
328  slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
329 
330  position = slice->BSNALunitDataLocation;
331  size = slice->SliceBytesInBuffer;
332  if (start_code_size + size > end - current) {
333  av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
334  break;
335  }
336 
337  slice->BSNALunitDataLocation = current - dxva_data;
338  slice->SliceBytesInBuffer = start_code_size + size;
339 
340  if (!is_slice_short(ctx)) {
341  DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
342  if (i < ctx_pic->slice_count - 1)
343  slice_long->NumMbsForSlice =
344  slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
345  else
346  slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
347  }
348 
349  memcpy(current, start_code, start_code_size);
350  current += start_code_size;
351 
352  memcpy(current, &ctx_pic->bitstream[position], size);
353  current += size;
354  }
355  padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
356  if (slice && padding > 0) {
357  memset(current, 0, padding);
358  current += padding;
359 
360  slice->SliceBytesInBuffer += padding;
361  }
362  if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
363  DXVA2_BitStreamDateBufferType)))
364  return -1;
365  if (i < ctx_pic->slice_count)
366  return -1;
367 
368  memset(bs, 0, sizeof(*bs));
369  bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
370  bs->DataSize = current - dxva_data;
371  bs->NumMBsInBuffer = mb_count;
372 
373  if (is_slice_short(ctx)) {
374  slice_data = ctx_pic->slice_short;
375  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
376  } else {
377  slice_data = ctx_pic->slice_long;
378  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
379  }
380  assert((bs->DataSize & 127) == 0);
381  return ff_dxva2_commit_buffer(avctx, ctx, sc,
382  DXVA2_SliceControlBufferType,
383  slice_data, slice_size, mb_count);
384 }
385 
386 
388  av_unused const uint8_t *buffer,
389  av_unused uint32_t size)
390 {
391  const H264Context *h = avctx->priv_data;
392  struct dxva_context *ctx = avctx->hwaccel_context;
394 
395  if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
396  return -1;
397  assert(ctx_pic);
398 
399  /* Fill up DXVA_PicParams_H264 */
400  fill_picture_parameters(ctx, h, &ctx_pic->pp);
401 
402  /* Fill up DXVA_Qmatrix_H264 */
403  fill_scaling_lists(ctx, h, &ctx_pic->qm);
404 
405  ctx_pic->slice_count = 0;
406  ctx_pic->bitstream_size = 0;
407  ctx_pic->bitstream = NULL;
408  return 0;
409 }
410 
412  const uint8_t *buffer,
413  uint32_t size)
414 {
415  const H264Context *h = avctx->priv_data;
416  struct dxva_context *ctx = avctx->hwaccel_context;
417  const H264Picture *current_picture = h->cur_pic_ptr;
418  struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
419  unsigned position;
420 
421  if (ctx_pic->slice_count >= MAX_SLICES)
422  return -1;
423 
424  if (!ctx_pic->bitstream)
425  ctx_pic->bitstream = buffer;
426  ctx_pic->bitstream_size += size;
427 
428  position = buffer - ctx_pic->bitstream;
429  if (is_slice_short(ctx))
430  fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
431  position, size);
432  else
433  fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
434  &ctx_pic->pp, position, size);
435  ctx_pic->slice_count++;
436 
438  ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
439  return 0;
440 }
441 
443 {
444  H264Context *h = avctx->priv_data;
445  struct dxva2_picture_context *ctx_pic =
447  int ret;
448 
449  if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
450  return -1;
451  ret = ff_dxva2_common_end_frame(avctx, &h->cur_pic_ptr->f,
452  &ctx_pic->pp, sizeof(ctx_pic->pp),
453  &ctx_pic->qm, sizeof(ctx_pic->qm),
455  if (!ret)
457  return ret;
458 }
459 
461  .name = "h264_dxva2",
462  .type = AVMEDIA_TYPE_VIDEO,
463  .id = AV_CODEC_ID_H264,
464  .pix_fmt = AV_PIX_FMT_DXVA2_VLD,
465  .start_frame = dxva2_h264_start_frame,
466  .decode_slice = dxva2_h264_decode_slice,
467  .end_frame = dxva2_h264_end_frame,
468  .frame_priv_data_size = sizeof(struct dxva2_picture_context),
469 };