Merge remote-tracking branch 'qatar/master'
[ffmpeg.git] / libavcodec / dxva2_h264.c
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                        <<  1) |
97                                         (h->sps.residual_color_transform_flag <<  2) |
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 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;
116     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
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;
126     if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
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));
160     if (ctx->workaround & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
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 < 2; i++)
166             for (j = 0; j < 64; j++)
167                 qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][j];
168     } else {
169         for (i = 0; i < 6; i++)
170             for (j = 0; j < 16; j++)
171                 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
172
173         for (i = 0; i < 2; i++)
174             for (j = 0; j < 64; j++)
175                 qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][ff_zigzag_direct[j]];
176     }
177 }
178
179 static int is_slice_short(struct dxva_context *ctx)
180 {
181     assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
182            ctx->cfg->ConfigBitstreamRaw == 2);
183     return ctx->cfg->ConfigBitstreamRaw == 2;
184 }
185
186 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
187                              unsigned position, unsigned size)
188 {
189     memset(slice, 0, sizeof(*slice));
190     slice->BSNALunitDataLocation = position;
191     slice->SliceBytesInBuffer    = size;
192     slice->wBadSliceChopping     = 0;
193 }
194
195 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
196                             unsigned position, unsigned size)
197 {
198     const H264Context *h = avctx->priv_data;
199     struct dxva_context *ctx = avctx->hwaccel_context;
200     const MpegEncContext *s = &h->s;
201     unsigned list;
202
203     memset(slice, 0, sizeof(*slice));
204     slice->BSNALunitDataLocation = position;
205     slice->SliceBytesInBuffer    = size;
206     slice->wBadSliceChopping     = 0;
207
208     slice->first_mb_in_slice     = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
209     slice->NumMbsForSlice        = 0; /* XXX it is set once we have all slices */
210     slice->BitOffsetToSliceData  = get_bits_count(&s->gb);
211     slice->slice_type            = ff_h264_get_slice_type(h);
212     if (h->slice_type_fixed)
213         slice->slice_type += 5;
214     slice->luma_log2_weight_denom       = h->luma_log2_weight_denom;
215     slice->chroma_log2_weight_denom     = h->chroma_log2_weight_denom;
216     if (h->list_count > 0)
217         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
218     if (h->list_count > 1)
219         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
220     slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
221     slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
222     slice->Reserved8Bits                = 0;
223
224     for (list = 0; list < 2; list++) {
225         unsigned i;
226         for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
227             if (list < h->list_count && i < h->ref_count[list]) {
228                 const Picture *r = &h->ref_list[list][i];
229                 unsigned plane;
230                 fill_picture_entry(&slice->RefPicList[list][i],
231                                    ff_dxva2_get_surface_index(ctx, r),
232                                    r->f.reference == PICT_BOTTOM_FIELD);
233                 for (plane = 0; plane < 3; plane++) {
234                     int w, o;
235                     if (plane == 0 && h->luma_weight_flag[list]) {
236                         w = h->luma_weight[i][list][0];
237                         o = h->luma_weight[i][list][1];
238                     } else if (plane >= 1 && h->chroma_weight_flag[list]) {
239                         w = h->chroma_weight[i][list][plane-1][0];
240                         o = h->chroma_weight[i][list][plane-1][1];
241                     } else {
242                         w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
243                                                h->chroma_log2_weight_denom);
244                         o = 0;
245                     }
246                     slice->Weights[list][i][plane][0] = w;
247                     slice->Weights[list][i][plane][1] = o;
248                 }
249             } else {
250                 unsigned plane;
251                 slice->RefPicList[list][i].bPicEntry = 0xff;
252                 for (plane = 0; plane < 3; plane++) {
253                     slice->Weights[list][i][plane][0] = 0;
254                     slice->Weights[list][i][plane][1] = 0;
255                 }
256             }
257         }
258     }
259     slice->slice_qs_delta    = 0; /* XXX not implemented by FFmpeg */
260     slice->slice_qp_delta    = s->qscale - h->pps.init_qp;
261     slice->redundant_pic_cnt = h->redundant_pic_count;
262     if (h->slice_type == AV_PICTURE_TYPE_B)
263         slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
264     slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
265     if (h->deblocking_filter < 2)
266         slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
267     else
268         slice->disable_deblocking_filter_idc = h->deblocking_filter;
269     slice->slice_id = h->current_slice - 1;
270 }
271
272 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
273                                              DXVA2_DecodeBufferDesc *bs,
274                                              DXVA2_DecodeBufferDesc *sc)
275 {
276     const H264Context *h = avctx->priv_data;
277     const MpegEncContext *s = &h->s;
278     const unsigned mb_count = s->mb_width * s->mb_height;
279     struct dxva_context *ctx = avctx->hwaccel_context;
280     const Picture *current_picture = h->s.current_picture_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                                                &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
370 static int start_frame(AVCodecContext *avctx,
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;
376     struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->f.hwaccel_picture_private;
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
394 static int decode_slice(AVCodecContext *avctx,
395                         const uint8_t *buffer, uint32_t size)
396 {
397     const H264Context *h = avctx->priv_data;
398     struct dxva_context *ctx = avctx->hwaccel_context;
399     const Picture *current_picture = h->s.current_picture_ptr;
400     struct dxva2_picture_context *ctx_pic = current_picture->f.hwaccel_picture_private;
401     unsigned position;
402
403     if (ctx_pic->slice_count >= MAX_SLICES)
404         return -1;
405
406     if (!ctx_pic->bitstream)
407         ctx_pic->bitstream = buffer;
408     ctx_pic->bitstream_size += size;
409
410     position = buffer - ctx_pic->bitstream;
411     if (is_slice_short(ctx))
412         fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
413                          position, size);
414     else
415         fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
416                         position, size);
417     ctx_pic->slice_count++;
418
419     if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
420         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
421     return 0;
422 }
423
424 static int end_frame(AVCodecContext *avctx)
425 {
426     H264Context *h = avctx->priv_data;
427     MpegEncContext *s = &h->s;
428     struct dxva2_picture_context *ctx_pic =
429         h->s.current_picture_ptr->f.hwaccel_picture_private;
430
431     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
432         return -1;
433     return ff_dxva2_common_end_frame(avctx, s,
434                                      &ctx_pic->pp, sizeof(ctx_pic->pp),
435                                      &ctx_pic->qm, sizeof(ctx_pic->qm),
436                                      commit_bitstream_and_slice_buffer);
437 }
438
439 AVHWAccel ff_h264_dxva2_hwaccel = {
440     .name           = "h264_dxva2",
441     .type           = AVMEDIA_TYPE_VIDEO,
442     .id             = CODEC_ID_H264,
443     .pix_fmt        = PIX_FMT_DXVA2_VLD,
444     .capabilities   = 0,
445     .start_frame    = start_frame,
446     .decode_slice   = decode_slice,
447     .end_frame      = end_frame,
448     .priv_data_size = sizeof(struct dxva2_picture_context),
449 };
450