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dxva2_mpeg2.c
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1 /*
2  * MPEG-2 HW acceleration.
3  *
4  * copyright (c) 2010 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 "libavutil/log.h"
24 #include "dxva2_internal.h"
25 #include "mpegutils.h"
26 
27 #define MAX_SLICES 1024
28 struct dxva2_picture_context {
29  DXVA_PictureParameters pp;
30  DXVA_QmatrixData qm;
31  unsigned slice_count;
32  DXVA_SliceInfo slice[MAX_SLICES];
33 
34  const uint8_t *bitstream;
35  unsigned bitstream_size;
36 };
37 
39  struct dxva_context *ctx,
40  const struct MpegEncContext *s,
41  DXVA_PictureParameters *pp)
42 {
43  const Picture *current_picture = s->current_picture_ptr;
44  int is_field = s->picture_structure != PICT_FRAME;
45 
46  memset(pp, 0, sizeof(*pp));
47  pp->wDecodedPictureIndex = ff_dxva2_get_surface_index(ctx, current_picture->f);
48  pp->wDeblockedPictureIndex = 0;
49  if (s->pict_type != AV_PICTURE_TYPE_I)
50  pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, s->last_picture.f);
51  else
52  pp->wForwardRefPictureIndex = 0xffff;
53  if (s->pict_type == AV_PICTURE_TYPE_B)
54  pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, s->next_picture.f);
55  else
56  pp->wBackwardRefPictureIndex = 0xffff;
57  pp->wPicWidthInMBminus1 = s->mb_width - 1;
58  pp->wPicHeightInMBminus1 = (s->mb_height >> is_field) - 1;
59  pp->bMacroblockWidthMinus1 = 15;
60  pp->bMacroblockHeightMinus1 = 15;
61  pp->bBlockWidthMinus1 = 7;
62  pp->bBlockHeightMinus1 = 7;
63  pp->bBPPminus1 = 7;
64  pp->bPicStructure = s->picture_structure;
65  pp->bSecondField = is_field && !s->first_field;
66  pp->bPicIntra = s->pict_type == AV_PICTURE_TYPE_I;
67  pp->bPicBackwardPrediction = s->pict_type == AV_PICTURE_TYPE_B;
68  pp->bBidirectionalAveragingMode = 0;
69  pp->bMVprecisionAndChromaRelation= 0; /* FIXME */
70  pp->bChromaFormat = s->chroma_format;
71  pp->bPicScanFixed = 1;
72  pp->bPicScanMethod = s->alternate_scan ? 1 : 0;
73  pp->bPicReadbackRequests = 0;
74  pp->bRcontrol = 0;
75  pp->bPicSpatialResid8 = 0;
76  pp->bPicOverflowBlocks = 0;
77  pp->bPicExtrapolation = 0;
78  pp->bPicDeblocked = 0;
79  pp->bPicDeblockConfined = 0;
80  pp->bPic4MVallowed = 0;
81  pp->bPicOBMC = 0;
82  pp->bPicBinPB = 0;
83  pp->bMV_RPS = 0;
84  pp->bReservedBits = 0;
85  pp->wBitstreamFcodes = (s->mpeg_f_code[0][0] << 12) |
86  (s->mpeg_f_code[0][1] << 8) |
87  (s->mpeg_f_code[1][0] << 4) |
88  (s->mpeg_f_code[1][1] );
89  pp->wBitstreamPCEelements = (s->intra_dc_precision << 14) |
90  (s->picture_structure << 12) |
91  (s->top_field_first << 11) |
92  (s->frame_pred_frame_dct << 10) |
93  (s->concealment_motion_vectors << 9) |
94  (s->q_scale_type << 8) |
95  (s->intra_vlc_format << 7) |
96  (s->alternate_scan << 6) |
97  (s->repeat_first_field << 5) |
98  (s->chroma_420_type << 4) |
99  (s->progressive_frame << 3);
100  pp->bBitstreamConcealmentNeed = 0;
101  pp->bBitstreamConcealmentMethod = 0;
102 }
103 
105  struct dxva_context *ctx,
106  const struct MpegEncContext *s,
107  DXVA_QmatrixData *qm)
108 {
109  int i;
110  for (i = 0; i < 4; i++)
111  qm->bNewQmatrix[i] = 1;
112  for (i = 0; i < 64; i++) {
114  qm->Qmatrix[0][i] = s->intra_matrix[n];
115  qm->Qmatrix[1][i] = s->inter_matrix[n];
116  qm->Qmatrix[2][i] = s->chroma_intra_matrix[n];
117  qm->Qmatrix[3][i] = s->chroma_inter_matrix[n];
118  }
119 }
120 
121 static void fill_slice(AVCodecContext *avctx,
122  const struct MpegEncContext *s,
123  DXVA_SliceInfo *slice,
124  unsigned position,
125  const uint8_t *buffer, unsigned size)
126 {
127  int is_field = s->picture_structure != PICT_FRAME;
128  GetBitContext gb;
129 
130  memset(slice, 0, sizeof(*slice));
131  slice->wHorizontalPosition = s->mb_x;
132  slice->wVerticalPosition = s->mb_y >> is_field;
133  slice->dwSliceBitsInBuffer = 8 * size;
134  slice->dwSliceDataLocation = position;
135  slice->bStartCodeBitOffset = 0;
136  slice->bReservedBits = 0;
137  /* XXX We store the index of the first MB and it will be fixed later */
138  slice->wNumberMBsInSlice = (s->mb_y >> is_field) * s->mb_width + s->mb_x;
139  slice->wBadSliceChopping = 0;
140 
141  init_get_bits(&gb, &buffer[4], 8 * (size - 4));
142 
143  slice->wQuantizerScaleCode = get_bits(&gb, 5);
145 
146  slice->wMBbitOffset = 4 * 8 + get_bits_count(&gb);
147 }
149  DXVA2_DecodeBufferDesc *bs,
150  DXVA2_DecodeBufferDesc *sc)
151 {
152  const struct MpegEncContext *s = avctx->priv_data;
153  struct dxva_context *ctx = avctx->hwaccel_context;
154  struct dxva2_picture_context *ctx_pic =
156  const int is_field = s->picture_structure != PICT_FRAME;
157  const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
158  uint8_t *dxva_data, *current, *end;
159  unsigned dxva_size;
160  unsigned i;
161 
162  if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
163  DXVA2_BitStreamDateBufferType,
164  (void **)&dxva_data, &dxva_size)))
165  return -1;
166  current = dxva_data;
167  end = dxva_data + dxva_size;
168 
169  for (i = 0; i < ctx_pic->slice_count; i++) {
170  DXVA_SliceInfo *slice = &ctx_pic->slice[i];
171  unsigned position = slice->dwSliceDataLocation;
172  unsigned size = slice->dwSliceBitsInBuffer / 8;
173  if (size > end - current) {
174  av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
175  break;
176  }
177  slice->dwSliceDataLocation = current - dxva_data;
178 
179  if (i < ctx_pic->slice_count - 1)
180  slice->wNumberMBsInSlice =
181  slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
182  else
183  slice->wNumberMBsInSlice =
184  mb_count - slice[0].wNumberMBsInSlice;
185 
186  memcpy(current, &ctx_pic->bitstream[position], size);
187  current += size;
188  }
189  if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
190  DXVA2_BitStreamDateBufferType)))
191  return -1;
192  if (i < ctx_pic->slice_count)
193  return -1;
194 
195  memset(bs, 0, sizeof(*bs));
196  bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
197  bs->DataSize = current - dxva_data;
198  bs->NumMBsInBuffer = mb_count;
199 
200  return ff_dxva2_commit_buffer(avctx, ctx, sc,
201  DXVA2_SliceControlBufferType,
202  ctx_pic->slice,
203  ctx_pic->slice_count * sizeof(*ctx_pic->slice),
204  mb_count);
205 }
206 
208  av_unused const uint8_t *buffer,
209  av_unused uint32_t size)
210 {
211  const struct MpegEncContext *s = avctx->priv_data;
212  struct dxva_context *ctx = avctx->hwaccel_context;
213  struct dxva2_picture_context *ctx_pic =
215 
216  if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
217  return -1;
218  assert(ctx_pic);
219 
220  fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
221  fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
222 
223  ctx_pic->slice_count = 0;
224  ctx_pic->bitstream_size = 0;
225  ctx_pic->bitstream = NULL;
226  return 0;
227 }
228 
230  const uint8_t *buffer, uint32_t size)
231 {
232  const struct MpegEncContext *s = avctx->priv_data;
233  struct dxva2_picture_context *ctx_pic =
235  unsigned position;
236 
237  if (ctx_pic->slice_count >= MAX_SLICES) {
238  avpriv_request_sample(avctx, "%d slices in dxva2",
239  ctx_pic->slice_count);
240  return -1;
241  }
242  if (!ctx_pic->bitstream)
243  ctx_pic->bitstream = buffer;
244  ctx_pic->bitstream_size += size;
245 
246  position = buffer - ctx_pic->bitstream;
247  fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
248  buffer, size);
249  return 0;
250 }
251 
253 {
254  struct MpegEncContext *s = avctx->priv_data;
255  struct dxva2_picture_context *ctx_pic =
257  int ret;
258 
259  if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
260  return -1;
262  &ctx_pic->pp, sizeof(ctx_pic->pp),
263  &ctx_pic->qm, sizeof(ctx_pic->qm),
265  if (!ret)
266  ff_mpeg_draw_horiz_band(s, 0, avctx->height);
267  return ret;
268 }
269 
271  .name = "mpeg2_dxva2",
272  .type = AVMEDIA_TYPE_VIDEO,
274  .pix_fmt = AV_PIX_FMT_DXVA2_VLD,
275  .start_frame = dxva2_mpeg2_start_frame,
276  .decode_slice = dxva2_mpeg2_decode_slice,
277  .end_frame = dxva2_mpeg2_end_frame,
278  .frame_priv_data_size = sizeof(struct dxva2_picture_context),
279 };