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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 
28  DXVA_PicParams_H264 pp;
29  DXVA_Qmatrix_H264 qm;
30  unsigned slice_count;
31  DXVA_Slice_H264_Short slice_short[MAX_SLICES];
32  DXVA_Slice_H264_Long slice_long[MAX_SLICES];
33  const uint8_t *bitstream;
34  unsigned bitstream_size;
35 };
36 
37 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
38  unsigned index, unsigned flag)
39 {
40  assert((index&0x7f) == index && (flag&0x01) == flag);
41  pic->bPicEntry = index | (flag << 7);
42 }
43 
44 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
45  DXVA_PicParams_H264 *pp)
46 {
47  const MpegEncContext *s = &h->s;
48  const Picture *current_picture = s->current_picture_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),
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 Picture *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],
71  r->long_ref != 0);
72 
73  if ((r->f.reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
74  pp->FieldOrderCntList[i][0] = r->field_poc[0];
75  if ((r->f.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->f.reference & PICT_TOP_FIELD)
80  pp->UsedForReferenceFlags |= 1 << (2*i + 0);
81  if (r->f.reference & PICT_BOTTOM_FIELD)
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 = s->mb_width - 1;
92  pp->wFrameHeightInMbsMinus1 = s->mb_height - 1;
93  pp->num_ref_frames = h->sps.ref_frame_count;
94 
95  pp->wBitFields = ((s->picture_structure != PICT_FRAME) << 0) |
96  (h->sps.mb_aff << 1) |
98  /* sp_for_switch_flag (not implemented by Libav) */
99  (0 << 3) |
100  (h->sps.chroma_format_idc << 4) |
101  ((h->nal_ref_idc != 0) << 6) |
102  (h->pps.constrained_intra_pred << 7) |
103  (h->pps.weighted_pred << 8) |
104  (h->pps.weighted_bipred_idc << 9) |
105  /* MbsConsecutiveFlag */
106  (1 << 11) |
107  (h->sps.frame_mbs_only_flag << 12) |
108  (h->pps.transform_8x8_mode << 13) |
109  ((h->sps.level_idc >= 31) << 14) |
110  /* IntraPicFlag (Modified if we detect a non
111  * intra slice in decode_slice) */
112  (1 << 15);
113 
114  pp->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
115  pp->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
117  pp->Reserved16Bits = 0;
118  else
119  pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
120  pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
121  pp->CurrFieldOrderCnt[0] = 0;
122  if ((s->picture_structure & PICT_TOP_FIELD) &&
123  current_picture->field_poc[0] != INT_MAX)
124  pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
125  pp->CurrFieldOrderCnt[1] = 0;
127  current_picture->field_poc[1] != INT_MAX)
128  pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
129  pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
130  pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
131  pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
132  pp->ContinuationFlag = 1;
133  pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
134  pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
135  pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
136  pp->Reserved8BitsA = 0;
137  pp->frame_num = h->frame_num;
138  pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
139  pp->pic_order_cnt_type = h->sps.poc_type;
140  if (h->sps.poc_type == 0)
141  pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
142  else if (h->sps.poc_type == 1)
143  pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
144  pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
145  pp->entropy_coding_mode_flag = h->pps.cabac;
146  pp->pic_order_present_flag = h->pps.pic_order_present;
147  pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
148  pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
149  pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
150  pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
151  pp->Reserved8BitsB = 0;
152  pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by Libav */
153  //pp->SliceGroupMap[810]; /* XXX not implemented by Libav */
154 }
155 
156 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
157 {
158  unsigned i, j;
159  memset(qm, 0, sizeof(*qm));
161  for (i = 0; i < 6; i++)
162  for (j = 0; j < 16; j++)
163  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
164 
165  for (i = 0; i < 64; i++) {
166  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
167  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
168  }
169  } else {
170  for (i = 0; i < 6; i++)
171  for (j = 0; j < 16; j++)
172  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
173 
174  for (i = 0; i < 64; i++) {
175  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
176  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
177  }
178  }
179 }
180 
181 static int is_slice_short(struct dxva_context *ctx)
182 {
183  assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
184  ctx->cfg->ConfigBitstreamRaw == 2);
185  return ctx->cfg->ConfigBitstreamRaw == 2;
186 }
187 
188 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
189  unsigned position, unsigned size)
190 {
191  memset(slice, 0, sizeof(*slice));
192  slice->BSNALunitDataLocation = position;
193  slice->SliceBytesInBuffer = size;
194  slice->wBadSliceChopping = 0;
195 }
196 
197 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
198  unsigned position, unsigned size)
199 {
200  const H264Context *h = avctx->priv_data;
201  struct dxva_context *ctx = avctx->hwaccel_context;
202  const MpegEncContext *s = &h->s;
203  unsigned list;
204 
205  memset(slice, 0, sizeof(*slice));
206  slice->BSNALunitDataLocation = position;
207  slice->SliceBytesInBuffer = size;
208  slice->wBadSliceChopping = 0;
209 
210  slice->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
211  slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
212  slice->BitOffsetToSliceData = get_bits_count(&s->gb);
213  slice->slice_type = ff_h264_get_slice_type(h);
214  if (h->slice_type_fixed)
215  slice->slice_type += 5;
216  slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
217  slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
218  if (h->list_count > 0)
219  slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
220  if (h->list_count > 1)
221  slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
222  slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26;
223  slice->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26;
224  slice->Reserved8Bits = 0;
225 
226  for (list = 0; list < 2; list++) {
227  unsigned i;
228  for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
229  if (list < h->list_count && i < h->ref_count[list]) {
230  const Picture *r = &h->ref_list[list][i];
231  unsigned plane;
232  fill_picture_entry(&slice->RefPicList[list][i],
235  for (plane = 0; plane < 3; plane++) {
236  int w, o;
237  if (plane == 0 && h->luma_weight_flag[list]) {
238  w = h->luma_weight[i][list][0];
239  o = h->luma_weight[i][list][1];
240  } else if (plane >= 1 && h->chroma_weight_flag[list]) {
241  w = h->chroma_weight[i][list][plane-1][0];
242  o = h->chroma_weight[i][list][plane-1][1];
243  } else {
244  w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
246  o = 0;
247  }
248  slice->Weights[list][i][plane][0] = w;
249  slice->Weights[list][i][plane][1] = o;
250  }
251  } else {
252  unsigned plane;
253  slice->RefPicList[list][i].bPicEntry = 0xff;
254  for (plane = 0; plane < 3; plane++) {
255  slice->Weights[list][i][plane][0] = 0;
256  slice->Weights[list][i][plane][1] = 0;
257  }
258  }
259  }
260  }
261  slice->slice_qs_delta = 0; /* XXX not implemented by Libav */
262  slice->slice_qp_delta = s->qscale - h->pps.init_qp;
263  slice->redundant_pic_cnt = h->redundant_pic_count;
264  if (h->slice_type == AV_PICTURE_TYPE_B)
265  slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
266  slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
267  if (h->deblocking_filter < 2)
268  slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
269  else
270  slice->disable_deblocking_filter_idc = h->deblocking_filter;
271  slice->slice_id = h->current_slice - 1;
272 }
273 
275  DXVA2_DecodeBufferDesc *bs,
276  DXVA2_DecodeBufferDesc *sc)
277 {
278  const H264Context *h = avctx->priv_data;
279  const MpegEncContext *s = &h->s;
280  const unsigned mb_count = s->mb_width * s->mb_height;
281  struct dxva_context *ctx = avctx->hwaccel_context;
282  const Picture *current_picture = h->s.current_picture_ptr;
283  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
284  DXVA_Slice_H264_Short *slice = NULL;
285  uint8_t *dxva_data, *current, *end;
286  unsigned dxva_size;
287  void *slice_data;
288  unsigned slice_size;
289  unsigned padding;
290  unsigned i;
291 
292  /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
293  if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
294  DXVA2_BitStreamDateBufferType,
295  &dxva_data, &dxva_size)))
296  return -1;
297  current = dxva_data;
298  end = dxva_data + dxva_size;
299 
300  for (i = 0; i < ctx_pic->slice_count; i++) {
301  static const uint8_t start_code[] = { 0, 0, 1 };
302  static const unsigned start_code_size = sizeof(start_code);
303  unsigned position, size;
304 
305  assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
306  offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
307  assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
308  offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
309 
310  if (is_slice_short(ctx))
311  slice = &ctx_pic->slice_short[i];
312  else
313  slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
314 
315  position = slice->BSNALunitDataLocation;
316  size = slice->SliceBytesInBuffer;
317  if (start_code_size + size > end - current) {
318  av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
319  break;
320  }
321 
322  slice->BSNALunitDataLocation = current - dxva_data;
323  slice->SliceBytesInBuffer = start_code_size + size;
324 
325  if (!is_slice_short(ctx)) {
326  DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
327  if (i < ctx_pic->slice_count - 1)
328  slice_long->NumMbsForSlice =
329  slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
330  else
331  slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
332  }
333 
334  memcpy(current, start_code, start_code_size);
335  current += start_code_size;
336 
337  memcpy(current, &ctx_pic->bitstream[position], size);
338  current += size;
339  }
340  padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
341  if (slice && padding > 0) {
342  memset(current, 0, padding);
343  current += padding;
344 
345  slice->SliceBytesInBuffer += padding;
346  }
347  if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
348  DXVA2_BitStreamDateBufferType)))
349  return -1;
350  if (i < ctx_pic->slice_count)
351  return -1;
352 
353  memset(bs, 0, sizeof(*bs));
354  bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
355  bs->DataSize = current - dxva_data;
356  bs->NumMBsInBuffer = mb_count;
357 
358  if (is_slice_short(ctx)) {
359  slice_data = ctx_pic->slice_short;
360  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
361  } else {
362  slice_data = ctx_pic->slice_long;
363  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
364  }
365  assert((bs->DataSize & 127) == 0);
366  return ff_dxva2_commit_buffer(avctx, ctx, sc,
367  DXVA2_SliceControlBufferType,
368  slice_data, slice_size, mb_count);
369 }
370 
371 
372 static int start_frame(AVCodecContext *avctx,
373  av_unused const uint8_t *buffer,
374  av_unused uint32_t size)
375 {
376  const H264Context *h = avctx->priv_data;
377  struct dxva_context *ctx = avctx->hwaccel_context;
379 
380  if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
381  return -1;
382  assert(ctx_pic);
383 
384  /* Fill up DXVA_PicParams_H264 */
385  fill_picture_parameters(ctx, h, &ctx_pic->pp);
386 
387  /* Fill up DXVA_Qmatrix_H264 */
388  fill_scaling_lists(ctx, h, &ctx_pic->qm);
389 
390  ctx_pic->slice_count = 0;
391  ctx_pic->bitstream_size = 0;
392  ctx_pic->bitstream = NULL;
393  return 0;
394 }
395 
396 static int decode_slice(AVCodecContext *avctx,
397  const uint8_t *buffer, uint32_t size)
398 {
399  const H264Context *h = avctx->priv_data;
400  struct dxva_context *ctx = avctx->hwaccel_context;
401  const Picture *current_picture = h->s.current_picture_ptr;
402  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
403  unsigned position;
404 
405  if (ctx_pic->slice_count >= MAX_SLICES)
406  return -1;
407 
408  if (!ctx_pic->bitstream)
409  ctx_pic->bitstream = buffer;
410  ctx_pic->bitstream_size += size;
411 
412  position = buffer - ctx_pic->bitstream;
413  if (is_slice_short(ctx))
414  fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
415  position, size);
416  else
417  fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
418  position, size);
419  ctx_pic->slice_count++;
420 
422  ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
423  return 0;
424 }
425 
426 static int end_frame(AVCodecContext *avctx)
427 {
428  H264Context *h = avctx->priv_data;
429  MpegEncContext *s = &h->s;
430  struct dxva2_picture_context *ctx_pic =
432 
433  if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
434  return -1;
435  return ff_dxva2_common_end_frame(avctx, s,
436  &ctx_pic->pp, sizeof(ctx_pic->pp),
437  &ctx_pic->qm, sizeof(ctx_pic->qm),
439 }
440 
442  .name = "h264_dxva2",
443  .type = AVMEDIA_TYPE_VIDEO,
444  .id = CODEC_ID_H264,
445  .pix_fmt = PIX_FMT_DXVA2_VLD,
446  .start_frame = start_frame,
447  .decode_slice = decode_slice,
448  .end_frame = end_frame,
449  .priv_data_size = sizeof(struct dxva2_picture_context),
450 };
451