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 
27 struct dxva2_picture_context {
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),
55  s->picture_structure == PICT_BOTTOM_FIELD);
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],
70  ff_dxva2_get_surface_index(ctx, r),
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 &&
97  (s->picture_structure == PICT_FRAME)) << 1) |
98  (h->sps.residual_color_transform_flag << 2) |
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 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;
117  if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
118  pp->Reserved16Bits = 0;
119  else
120  pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
121  pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
122  pp->CurrFieldOrderCnt[0] = 0;
123  if ((s->picture_structure & PICT_TOP_FIELD) &&
124  current_picture->field_poc[0] != INT_MAX)
125  pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
126  pp->CurrFieldOrderCnt[1] = 0;
127  if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
128  current_picture->field_poc[1] != INT_MAX)
129  pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
130  pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
131  pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
132  pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
133  pp->ContinuationFlag = 1;
134  pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
135  pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
136  pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
137  pp->Reserved8BitsA = 0;
138  pp->frame_num = h->frame_num;
139  pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
140  pp->pic_order_cnt_type = h->sps.poc_type;
141  if (h->sps.poc_type == 0)
142  pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
143  else if (h->sps.poc_type == 1)
144  pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
145  pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
146  pp->entropy_coding_mode_flag = h->pps.cabac;
147  pp->pic_order_present_flag = h->pps.pic_order_present;
148  pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
149  pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
150  pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
151  pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
152  pp->Reserved8BitsB = 0;
153  pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by FFmpeg */
154  //pp->SliceGroupMap[810]; /* XXX not implemented by FFmpeg */
155 }
156 
157 static void fill_scaling_lists(struct dxva_context *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
158 {
159  unsigned i, j;
160  memset(qm, 0, sizeof(*qm));
161  if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
162  for (i = 0; i < 6; i++)
163  for (j = 0; j < 16; j++)
164  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
165 
166  for (i = 0; i < 64; i++) {
167  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
168  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
169  }
170  } else {
171  for (i = 0; i < 6; i++)
172  for (j = 0; j < 16; j++)
173  qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
174 
175  for (i = 0; i < 64; i++) {
176  qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
177  qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
178  }
179  }
180 }
181 
182 static int is_slice_short(struct dxva_context *ctx)
183 {
184  assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
185  ctx->cfg->ConfigBitstreamRaw == 2);
186  return ctx->cfg->ConfigBitstreamRaw == 2;
187 }
188 
189 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
190  unsigned position, unsigned size)
191 {
192  memset(slice, 0, sizeof(*slice));
193  slice->BSNALunitDataLocation = position;
194  slice->SliceBytesInBuffer = size;
195  slice->wBadSliceChopping = 0;
196 }
197 
198 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
199  unsigned position, unsigned size)
200 {
201  const H264Context *h = avctx->priv_data;
202  struct dxva_context *ctx = avctx->hwaccel_context;
203  const MpegEncContext *s = &h->s;
204  unsigned list;
205 
206  memset(slice, 0, sizeof(*slice));
207  slice->BSNALunitDataLocation = position;
208  slice->SliceBytesInBuffer = size;
209  slice->wBadSliceChopping = 0;
210 
211  slice->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
212  slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
213  slice->BitOffsetToSliceData = get_bits_count(&s->gb);
214  slice->slice_type = ff_h264_get_slice_type(h);
215  if (h->slice_type_fixed)
216  slice->slice_type += 5;
217  slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
218  slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
219  if (h->list_count > 0)
220  slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
221  if (h->list_count > 1)
222  slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
223  slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26;
224  slice->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26;
225  slice->Reserved8Bits = 0;
226 
227  for (list = 0; list < 2; list++) {
228  unsigned i;
229  for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
230  if (list < h->list_count && i < h->ref_count[list]) {
231  const Picture *r = &h->ref_list[list][i];
232  unsigned plane;
233  fill_picture_entry(&slice->RefPicList[list][i],
234  ff_dxva2_get_surface_index(ctx, r),
235  r->f.reference == PICT_BOTTOM_FIELD);
236  for (plane = 0; plane < 3; plane++) {
237  int w, o;
238  if (plane == 0 && h->luma_weight_flag[list]) {
239  w = h->luma_weight[i][list][0];
240  o = h->luma_weight[i][list][1];
241  } else if (plane >= 1 && h->chroma_weight_flag[list]) {
242  w = h->chroma_weight[i][list][plane-1][0];
243  o = h->chroma_weight[i][list][plane-1][1];
244  } else {
245  w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
246  h->chroma_log2_weight_denom);
247  o = 0;
248  }
249  slice->Weights[list][i][plane][0] = w;
250  slice->Weights[list][i][plane][1] = o;
251  }
252  } else {
253  unsigned plane;
254  slice->RefPicList[list][i].bPicEntry = 0xff;
255  for (plane = 0; plane < 3; plane++) {
256  slice->Weights[list][i][plane][0] = 0;
257  slice->Weights[list][i][plane][1] = 0;
258  }
259  }
260  }
261  }
262  slice->slice_qs_delta = 0; /* XXX not implemented by FFmpeg */
263  slice->slice_qp_delta = s->qscale - h->pps.init_qp;
264  slice->redundant_pic_cnt = h->redundant_pic_count;
265  if (h->slice_type == AV_PICTURE_TYPE_B)
266  slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
267  slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
268  if (h->deblocking_filter < 2)
269  slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
270  else
271  slice->disable_deblocking_filter_idc = h->deblocking_filter;
272  slice->slice_id = h->current_slice - 1;
273 }
274 
275 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
276  DXVA2_DecodeBufferDesc *bs,
277  DXVA2_DecodeBufferDesc *sc)
278 {
279  const H264Context *h = avctx->priv_data;
280  const MpegEncContext *s = &h->s;
281  const unsigned mb_count = s->mb_width * s->mb_height;
282  struct dxva_context *ctx = avctx->hwaccel_context;
283  const Picture *current_picture = h->s.current_picture_ptr;
284  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
285  DXVA_Slice_H264_Short *slice = NULL;
286  uint8_t *dxva_data, *current, *end;
287  unsigned dxva_size;
288  void *slice_data;
289  unsigned slice_size;
290  unsigned padding;
291  unsigned i;
292 
293  /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
294  if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
295  DXVA2_BitStreamDateBufferType,
296  (void **)&dxva_data, &dxva_size)))
297  return -1;
298  current = dxva_data;
299  end = dxva_data + dxva_size;
300 
301  for (i = 0; i < ctx_pic->slice_count; i++) {
302  static const uint8_t start_code[] = { 0, 0, 1 };
303  static const unsigned start_code_size = sizeof(start_code);
304  unsigned position, size;
305 
306  assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
307  offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
308  assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
309  offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
310 
311  if (is_slice_short(ctx))
312  slice = &ctx_pic->slice_short[i];
313  else
314  slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
315 
316  position = slice->BSNALunitDataLocation;
317  size = slice->SliceBytesInBuffer;
318  if (start_code_size + size > end - current) {
319  av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
320  break;
321  }
322 
323  slice->BSNALunitDataLocation = current - dxva_data;
324  slice->SliceBytesInBuffer = start_code_size + size;
325 
326  if (!is_slice_short(ctx)) {
327  DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
328  if (i < ctx_pic->slice_count - 1)
329  slice_long->NumMbsForSlice =
330  slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
331  else
332  slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
333  }
334 
335  memcpy(current, start_code, start_code_size);
336  current += start_code_size;
337 
338  memcpy(current, &ctx_pic->bitstream[position], size);
339  current += size;
340  }
341  padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
342  if (slice && padding > 0) {
343  memset(current, 0, padding);
344  current += padding;
345 
346  slice->SliceBytesInBuffer += padding;
347  }
348  if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
349  DXVA2_BitStreamDateBufferType)))
350  return -1;
351  if (i < ctx_pic->slice_count)
352  return -1;
353 
354  memset(bs, 0, sizeof(*bs));
355  bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
356  bs->DataSize = current - dxva_data;
357  bs->NumMBsInBuffer = mb_count;
358 
359  if (is_slice_short(ctx)) {
360  slice_data = ctx_pic->slice_short;
361  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
362  } else {
363  slice_data = ctx_pic->slice_long;
364  slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
365  }
366  assert((bs->DataSize & 127) == 0);
367  return ff_dxva2_commit_buffer(avctx, ctx, sc,
368  DXVA2_SliceControlBufferType,
369  slice_data, slice_size, mb_count);
370 }
371 
372 
373 static int start_frame(AVCodecContext *avctx,
374  av_unused const uint8_t *buffer,
375  av_unused uint32_t size)
376 {
377  const H264Context *h = avctx->priv_data;
378  struct dxva_context *ctx = avctx->hwaccel_context;
379  struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->f.hwaccel_picture_private;
380 
381  if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
382  return -1;
383  assert(ctx_pic);
384 
385  /* Fill up DXVA_PicParams_H264 */
386  fill_picture_parameters(ctx, h, &ctx_pic->pp);
387 
388  /* Fill up DXVA_Qmatrix_H264 */
389  fill_scaling_lists(ctx, h, &ctx_pic->qm);
390 
391  ctx_pic->slice_count = 0;
392  ctx_pic->bitstream_size = 0;
393  ctx_pic->bitstream = NULL;
394  return 0;
395 }
396 
397 static int decode_slice(AVCodecContext *avctx,
398  const uint8_t *buffer, uint32_t size)
399 {
400  const H264Context *h = avctx->priv_data;
401  struct dxva_context *ctx = avctx->hwaccel_context;
402  const Picture *current_picture = h->s.current_picture_ptr;
403  struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
404  unsigned position;
405 
406  if (ctx_pic->slice_count >= MAX_SLICES)
407  return -1;
408 
409  if (!ctx_pic->bitstream)
410  ctx_pic->bitstream = buffer;
411  ctx_pic->bitstream_size += size;
412 
413  position = buffer - ctx_pic->bitstream;
414  if (is_slice_short(ctx))
415  fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
416  position, size);
417  else
418  fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
419  position, size);
420  ctx_pic->slice_count++;
421 
422  if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
423  ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
424  return 0;
425 }
426 
427 static int end_frame(AVCodecContext *avctx)
428 {
429  H264Context *h = avctx->priv_data;
430  MpegEncContext *s = &h->s;
431  struct dxva2_picture_context *ctx_pic =
432  h->s.current_picture_ptr->f.hwaccel_picture_private;
433 
434  if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
435  return -1;
436  return ff_dxva2_common_end_frame(avctx, s,
437  &ctx_pic->pp, sizeof(ctx_pic->pp),
438  &ctx_pic->qm, sizeof(ctx_pic->qm),
439  commit_bitstream_and_slice_buffer);
440 }
441 
442 AVHWAccel ff_h264_dxva2_hwaccel = {
443  .name = "h264_dxva2",
444  .type = AVMEDIA_TYPE_VIDEO,
445  .id = AV_CODEC_ID_H264,
446  .pix_fmt = AV_PIX_FMT_DXVA2_VLD,
447  .start_frame = start_frame,
448  .decode_slice = decode_slice,
449  .end_frame = end_frame,
450  .priv_data_size = sizeof(struct dxva2_picture_context),
451 };
Generated on Sat May 25 2013 03:58:33 for FFmpeg by   doxygen 1.8.2