FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
dxva2_h264.c
Go to the documentation of this file.
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 
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];
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 Picture *current_picture = h->cur_pic_ptr;
48  int i, j;
49 
50  memset(pp, 0, sizeof(*pp));
51  /* Configure current picture */
52  fill_picture_entry(&pp->CurrPic,
53  ff_dxva2_get_surface_index(ctx, current_picture),
55  /* Configure the set of references */
56  pp->UsedForReferenceFlags = 0;
57  pp->NonExistingFrameFlags = 0;
58  for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
59  const Picture *r;
60  if (j < h->short_ref_count) {
61  r = h->short_ref[j++];
62  } else {
63  r = NULL;
64  while (!r && j < h->short_ref_count + 16)
65  r = h->long_ref[j++ - h->short_ref_count];
66  }
67  if (r) {
68  fill_picture_entry(&pp->RefFrameList[i],
70  r->long_ref != 0);
71 
72  if ((r->f.reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
73  pp->FieldOrderCntList[i][0] = r->field_poc[0];
74  if ((r->f.reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
75  pp->FieldOrderCntList[i][1] = r->field_poc[1];
76 
77  pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
78  if (r->f.reference & PICT_TOP_FIELD)
79  pp->UsedForReferenceFlags |= 1 << (2*i + 0);
80  if (r->f.reference & PICT_BOTTOM_FIELD)
81  pp->UsedForReferenceFlags |= 1 << (2*i + 1);
82  } else {
83  pp->RefFrameList[i].bPicEntry = 0xff;
84  pp->FieldOrderCntList[i][0] = 0;
85  pp->FieldOrderCntList[i][1] = 0;
86  pp->FrameNumList[i] = 0;
87  }
88  }
89 
90  pp->wFrameWidthInMbsMinus1 = h->mb_width - 1;
91  pp->wFrameHeightInMbsMinus1 = h->mb_height - 1;
92  pp->num_ref_frames = h->sps.ref_frame_count;
93 
94  pp->wBitFields = ((h->picture_structure != PICT_FRAME) << 0) |
95  ((h->sps.mb_aff &&
96  (h->picture_structure == PICT_FRAME)) << 1) |
98  /* sp_for_switch_flag (not implemented by FFmpeg) */
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 dxva2_h264_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 ((h->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 FFmpeg */
153  //pp->SliceGroupMap[810]; /* XXX not implemented by FFmpeg */
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  unsigned list;
203 
204  memset(slice, 0, sizeof(*slice));
205  slice->BSNALunitDataLocation = position;
206  slice->SliceBytesInBuffer = size;
207  slice->wBadSliceChopping = 0;
208 
209  slice->first_mb_in_slice = (h->mb_y >> FIELD_OR_MBAFF_PICTURE) * h->mb_width + h->mb_x;
210  slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
211  slice->BitOffsetToSliceData = get_bits_count(&h->gb);
212  slice->slice_type = ff_h264_get_slice_type(h);
213  if (h->slice_type_fixed)
214  slice->slice_type += 5;
215  slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
216  slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
217  if (h->list_count > 0)
218  slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
219  if (h->list_count > 1)
220  slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
221  slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26;
222  slice->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26;
223  slice->Reserved8Bits = 0;
224 
225  for (list = 0; list < 2; list++) {
226  unsigned i;
227  for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
228  if (list < h->list_count && i < h->ref_count[list]) {
229  const Picture *r = &h->ref_list[list][i];
230  unsigned plane;
231  fill_picture_entry(&slice->RefPicList[list][i],
234  for (plane = 0; plane < 3; plane++) {
235  int w, o;
236  if (plane == 0 && h->luma_weight_flag[list]) {
237  w = h->luma_weight[i][list][0];
238  o = h->luma_weight[i][list][1];
239  } else if (plane >= 1 && h->chroma_weight_flag[list]) {
240  w = h->chroma_weight[i][list][plane-1][0];
241  o = h->chroma_weight[i][list][plane-1][1];
242  } else {
243  w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
245  o = 0;
246  }
247  slice->Weights[list][i][plane][0] = w;
248  slice->Weights[list][i][plane][1] = o;
249  }
250  } else {
251  unsigned plane;
252  slice->RefPicList[list][i].bPicEntry = 0xff;
253  for (plane = 0; plane < 3; plane++) {
254  slice->Weights[list][i][plane][0] = 0;
255  slice->Weights[list][i][plane][1] = 0;
256  }
257  }
258  }
259  }
260  slice->slice_qs_delta = 0; /* XXX not implemented by FFmpeg */
261  slice->slice_qp_delta = h->qscale - h->pps.init_qp;
262  slice->redundant_pic_cnt = h->redundant_pic_count;
263  if (h->slice_type == AV_PICTURE_TYPE_B)
264  slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
265  slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
266  if (h->deblocking_filter < 2)
267  slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
268  else
269  slice->disable_deblocking_filter_idc = h->deblocking_filter;
270  slice->slice_id = h->current_slice - 1;
271 }
272 
274  DXVA2_DecodeBufferDesc *bs,
275  DXVA2_DecodeBufferDesc *sc)
276 {
277  const H264Context *h = avctx->priv_data;
278  const unsigned mb_count = h->mb_width * h->mb_height;
279  struct dxva_context *ctx = avctx->hwaccel_context;
280  const Picture *current_picture = h->cur_pic_ptr;
281  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
282  DXVA_Slice_H264_Short *slice = NULL;
283  uint8_t *dxva_data, *current, *end;
284  unsigned dxva_size;
285  void *slice_data;
286  unsigned slice_size;
287  unsigned padding;
288  unsigned i;
289 
290  /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
291  if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
292  DXVA2_BitStreamDateBufferType,
293  (void **)&dxva_data, &dxva_size)))
294  return -1;
295  current = dxva_data;
296  end = dxva_data + dxva_size;
297 
298  for (i = 0; i < ctx_pic->slice_count; i++) {
299  static const uint8_t start_code[] = { 0, 0, 1 };
300  static const unsigned start_code_size = sizeof(start_code);
301  unsigned position, size;
302 
303  assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
304  offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
305  assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
306  offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
307 
308  if (is_slice_short(ctx))
309  slice = &ctx_pic->slice_short[i];
310  else
311  slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
312 
313  position = slice->BSNALunitDataLocation;
314  size = slice->SliceBytesInBuffer;
315  if (start_code_size + size > end - current) {
316  av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
317  break;
318  }
319 
320  slice->BSNALunitDataLocation = current - dxva_data;
321  slice->SliceBytesInBuffer = start_code_size + size;
322 
323  if (!is_slice_short(ctx)) {
324  DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
325  if (i < ctx_pic->slice_count - 1)
326  slice_long->NumMbsForSlice =
327  slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
328  else
329  slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
330  }
331 
332  memcpy(current, start_code, start_code_size);
333  current += start_code_size;
334 
335  memcpy(current, &ctx_pic->bitstream[position], size);
336  current += size;
337  }
338  padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
339  if (slice && padding > 0) {
340  memset(current, 0, padding);
341  current += padding;
342 
343  slice->SliceBytesInBuffer += padding;
344  }
345  if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
346  DXVA2_BitStreamDateBufferType)))
347  return -1;
348  if (i < ctx_pic->slice_count)
349  return -1;
350 
351  memset(bs, 0, sizeof(*bs));
352  bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
353  bs->DataSize = current - dxva_data;
354  bs->NumMBsInBuffer = mb_count;
355 
356  if (is_slice_short(ctx)) {
357  slice_data = ctx_pic->slice_short;
358  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
359  } else {
360  slice_data = ctx_pic->slice_long;
361  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
362  }
363  assert((bs->DataSize & 127) == 0);
364  return ff_dxva2_commit_buffer(avctx, ctx, sc,
365  DXVA2_SliceControlBufferType,
366  slice_data, slice_size, mb_count);
367 }
368 
369 
371  av_unused const uint8_t *buffer,
372  av_unused uint32_t size)
373 {
374  const H264Context *h = avctx->priv_data;
375  struct dxva_context *ctx = avctx->hwaccel_context;
377 
378  if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
379  return -1;
380  assert(ctx_pic);
381 
382  /* Fill up DXVA_PicParams_H264 */
383  fill_picture_parameters(ctx, h, &ctx_pic->pp);
384 
385  /* Fill up DXVA_Qmatrix_H264 */
386  fill_scaling_lists(ctx, h, &ctx_pic->qm);
387 
388  ctx_pic->slice_count = 0;
389  ctx_pic->bitstream_size = 0;
390  ctx_pic->bitstream = NULL;
391  return 0;
392 }
393 
395  const uint8_t *buffer,
396  uint32_t size)
397 {
398  const H264Context *h = avctx->priv_data;
399  struct dxva_context *ctx = avctx->hwaccel_context;
400  const Picture *current_picture = h->cur_pic_ptr;
401  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
402  unsigned position;
403 
404  if (ctx_pic->slice_count >= MAX_SLICES)
405  return -1;
406 
407  if (!ctx_pic->bitstream)
408  ctx_pic->bitstream = buffer;
409  ctx_pic->bitstream_size += size;
410 
411  position = buffer - ctx_pic->bitstream;
412  if (is_slice_short(ctx))
413  fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
414  position, size);
415  else
416  fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
417  position, size);
418  ctx_pic->slice_count++;
419 
421  ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
422  return 0;
423 }
424 
426 {
427  H264Context *h = avctx->priv_data;
428  struct dxva2_picture_context *ctx_pic =
430  int ret;
431 
432  if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
433  return -1;
434  ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr,
435  &ctx_pic->pp, sizeof(ctx_pic->pp),
436  &ctx_pic->qm, sizeof(ctx_pic->qm),
438  if (!ret)
440  return ret;
441 }
442 
444  .name = "h264_dxva2",
445  .type = AVMEDIA_TYPE_VIDEO,
446  .id = AV_CODEC_ID_H264,
447  .pix_fmt = AV_PIX_FMT_DXVA2_VLD,
448  .start_frame = dxva2_h264_start_frame,
449  .decode_slice = dxva2_h264_decode_slice,
450  .end_frame = dxva2_h264_end_frame,
451  .priv_data_size = sizeof(struct dxva2_picture_context),
452 };