2 * DXVA2 H264 HW acceleration.
4 * copyright (c) 2009 Laurent Aimar
6 * This file is part of Libav.
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.
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.
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
23 #include "dxva2_internal.h"
27 struct dxva2_picture_context {
28 DXVA_PicParams_H264 pp;
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;
37 static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
38 unsigned index, unsigned flag)
40 assert((index&0x7f) == index && (flag&0x01) == flag);
41 pic->bPicEntry = index | (flag << 7);
44 static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
45 DXVA_PicParams_H264 *pp)
47 const MpegEncContext *s = &h->s;
48 const Picture *current_picture = s->current_picture_ptr;
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++) {
61 if (j < h->short_ref_count) {
62 r = h->short_ref[j++];
65 while (!r && j < h->short_ref_count + 16)
66 r = h->long_ref[j++ - h->short_ref_count];
69 fill_picture_entry(&pp->RefFrameList[i],
70 ff_dxva2_get_surface_index(ctx, r),
73 if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
74 pp->FieldOrderCntList[i][0] = r->field_poc[0];
75 if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
76 pp->FieldOrderCntList[i][1] = r->field_poc[1];
78 pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
79 if (r->reference & PICT_TOP_FIELD)
80 pp->UsedForReferenceFlags |= 1 << (2*i + 0);
81 if (r->reference & PICT_BOTTOM_FIELD)
82 pp->UsedForReferenceFlags |= 1 << (2*i + 1);
84 pp->RefFrameList[i].bPicEntry = 0xff;
85 pp->FieldOrderCntList[i][0] = 0;
86 pp->FieldOrderCntList[i][1] = 0;
87 pp->FrameNumList[i] = 0;
91 pp->wFrameWidthInMbsMinus1 = s->mb_width - 1;
92 pp->wFrameHeightInMbsMinus1 = s->mb_height - 1;
93 pp->num_ref_frames = h->sps.ref_frame_count;
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 Libav) */
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 */
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) */
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 pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
117 pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
118 pp->CurrFieldOrderCnt[0] = 0;
119 if ((s->picture_structure & PICT_TOP_FIELD) &&
120 current_picture->field_poc[0] != INT_MAX)
121 pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
122 pp->CurrFieldOrderCnt[1] = 0;
123 if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
124 current_picture->field_poc[1] != INT_MAX)
125 pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
126 pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
127 pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
128 pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
129 pp->ContinuationFlag = 1;
130 pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
131 pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
132 pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
133 pp->Reserved8BitsA = 0;
134 pp->frame_num = h->frame_num;
135 pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
136 pp->pic_order_cnt_type = h->sps.poc_type;
137 if (h->sps.poc_type == 0)
138 pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
139 else if (h->sps.poc_type == 1)
140 pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
141 pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
142 pp->entropy_coding_mode_flag = h->pps.cabac;
143 pp->pic_order_present_flag = h->pps.pic_order_present;
144 pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
145 pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
146 pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
147 pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
148 pp->Reserved8BitsB = 0;
149 pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by Libav */
150 //pp->SliceGroupMap[810]; /* XXX not implemented by Libav */
153 static void fill_scaling_lists(const H264Context *h, DXVA_Qmatrix_H264 *qm)
156 memset(qm, 0, sizeof(*qm));
157 for (i = 0; i < 6; i++)
158 for (j = 0; j < 16; j++)
159 qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
161 for (i = 0; i < 2; i++)
162 for (j = 0; j < 64; j++)
163 qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][ff_zigzag_direct[j]];
166 static int is_slice_short(struct dxva_context *ctx)
168 assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
169 ctx->cfg->ConfigBitstreamRaw == 2);
170 return ctx->cfg->ConfigBitstreamRaw == 2;
173 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
174 unsigned position, unsigned size)
176 memset(slice, 0, sizeof(*slice));
177 slice->BSNALunitDataLocation = position;
178 slice->SliceBytesInBuffer = size;
179 slice->wBadSliceChopping = 0;
182 static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
183 unsigned position, unsigned size)
185 const H264Context *h = avctx->priv_data;
186 struct dxva_context *ctx = avctx->hwaccel_context;
187 const MpegEncContext *s = &h->s;
190 memset(slice, 0, sizeof(*slice));
191 slice->BSNALunitDataLocation = position;
192 slice->SliceBytesInBuffer = size;
193 slice->wBadSliceChopping = 0;
195 slice->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
196 slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
197 slice->BitOffsetToSliceData = get_bits_count(&s->gb);
198 slice->slice_type = ff_h264_get_slice_type(h);
199 if (h->slice_type_fixed)
200 slice->slice_type += 5;
201 slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
202 slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
203 if (h->list_count > 0)
204 slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
205 if (h->list_count > 1)
206 slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
207 slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26;
208 slice->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26;
209 slice->Reserved8Bits = 0;
211 for (list = 0; list < 2; list++) {
213 for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
214 if (list < h->list_count && i < h->ref_count[list]) {
215 const Picture *r = &h->ref_list[list][i];
217 fill_picture_entry(&slice->RefPicList[list][i],
218 ff_dxva2_get_surface_index(ctx, r),
219 r->reference == PICT_BOTTOM_FIELD);
220 for (plane = 0; plane < 3; plane++) {
222 if (plane == 0 && h->luma_weight_flag[list]) {
223 w = h->luma_weight[i][list][0];
224 o = h->luma_weight[i][list][1];
225 } else if (plane >= 1 && h->chroma_weight_flag[list]) {
226 w = h->chroma_weight[i][list][plane-1][0];
227 o = h->chroma_weight[i][list][plane-1][1];
229 w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
230 h->chroma_log2_weight_denom);
233 slice->Weights[list][i][plane][0] = w;
234 slice->Weights[list][i][plane][1] = o;
238 slice->RefPicList[list][i].bPicEntry = 0xff;
239 for (plane = 0; plane < 3; plane++) {
240 slice->Weights[list][i][plane][0] = 0;
241 slice->Weights[list][i][plane][1] = 0;
246 slice->slice_qs_delta = 0; /* XXX not implemented by Libav */
247 slice->slice_qp_delta = s->qscale - h->pps.init_qp;
248 slice->redundant_pic_cnt = h->redundant_pic_count;
249 if (h->slice_type == AV_PICTURE_TYPE_B)
250 slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
251 slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
252 if (h->deblocking_filter < 2)
253 slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
255 slice->disable_deblocking_filter_idc = h->deblocking_filter;
256 slice->slice_id = h->current_slice - 1;
259 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
260 DXVA2_DecodeBufferDesc *bs,
261 DXVA2_DecodeBufferDesc *sc)
263 const H264Context *h = avctx->priv_data;
264 const MpegEncContext *s = &h->s;
265 const unsigned mb_count = s->mb_width * s->mb_height;
266 struct dxva_context *ctx = avctx->hwaccel_context;
267 const Picture *current_picture = h->s.current_picture_ptr;
268 struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
269 DXVA_Slice_H264_Short *slice = NULL;
270 uint8_t *dxva_data, *current, *end;
277 /* Create an annex B bitstream buffer with only slice NAL and finalize slice */
278 if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
279 DXVA2_BitStreamDateBufferType,
280 &dxva_data, &dxva_size)))
283 end = dxva_data + dxva_size;
285 for (i = 0; i < ctx_pic->slice_count; i++) {
286 static const uint8_t start_code[] = { 0, 0, 1 };
287 static const unsigned start_code_size = sizeof(start_code);
288 unsigned position, size;
290 assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
291 offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
292 assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
293 offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
295 if (is_slice_short(ctx))
296 slice = &ctx_pic->slice_short[i];
298 slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
300 position = slice->BSNALunitDataLocation;
301 size = slice->SliceBytesInBuffer;
302 if (start_code_size + size > end - current) {
303 av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
307 slice->BSNALunitDataLocation = current - dxva_data;
308 slice->SliceBytesInBuffer = start_code_size + size;
310 if (!is_slice_short(ctx)) {
311 DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
312 if (i < ctx_pic->slice_count - 1)
313 slice_long->NumMbsForSlice =
314 slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
316 slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
319 memcpy(current, start_code, start_code_size);
320 current += start_code_size;
322 memcpy(current, &ctx_pic->bitstream[position], size);
325 padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
326 if (slice && padding > 0) {
327 memset(current, 0, padding);
330 slice->SliceBytesInBuffer += padding;
332 if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
333 DXVA2_BitStreamDateBufferType)))
335 if (i < ctx_pic->slice_count)
338 memset(bs, 0, sizeof(*bs));
339 bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
340 bs->DataSize = current - dxva_data;
341 bs->NumMBsInBuffer = mb_count;
343 if (is_slice_short(ctx)) {
344 slice_data = ctx_pic->slice_short;
345 slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
347 slice_data = ctx_pic->slice_long;
348 slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
350 assert((bs->DataSize & 127) == 0);
351 return ff_dxva2_commit_buffer(avctx, ctx, sc,
352 DXVA2_SliceControlBufferType,
353 slice_data, slice_size, mb_count);
357 static int start_frame(AVCodecContext *avctx,
358 av_unused const uint8_t *buffer,
359 av_unused uint32_t size)
361 const H264Context *h = avctx->priv_data;
362 struct dxva_context *ctx = avctx->hwaccel_context;
363 struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->hwaccel_picture_private;
365 if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
369 /* Fill up DXVA_PicParams_H264 */
370 fill_picture_parameters(ctx, h, &ctx_pic->pp);
372 /* Fill up DXVA_Qmatrix_H264 */
373 fill_scaling_lists(h, &ctx_pic->qm);
375 ctx_pic->slice_count = 0;
376 ctx_pic->bitstream_size = 0;
377 ctx_pic->bitstream = NULL;
381 static int decode_slice(AVCodecContext *avctx,
382 const uint8_t *buffer, uint32_t size)
384 const H264Context *h = avctx->priv_data;
385 struct dxva_context *ctx = avctx->hwaccel_context;
386 const Picture *current_picture = h->s.current_picture_ptr;
387 struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
390 if (ctx_pic->slice_count >= MAX_SLICES)
393 if (!ctx_pic->bitstream)
394 ctx_pic->bitstream = buffer;
395 ctx_pic->bitstream_size += size;
397 position = buffer - ctx_pic->bitstream;
398 if (is_slice_short(ctx))
399 fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
402 fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
404 ctx_pic->slice_count++;
406 if (h->slice_type != AV_PICTURE_TYPE_I && h->slice_type != AV_PICTURE_TYPE_SI)
407 ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
411 static int end_frame(AVCodecContext *avctx)
413 H264Context *h = avctx->priv_data;
414 MpegEncContext *s = &h->s;
415 struct dxva2_picture_context *ctx_pic =
416 h->s.current_picture_ptr->hwaccel_picture_private;
418 if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
420 return ff_dxva2_common_end_frame(avctx, s,
421 &ctx_pic->pp, sizeof(ctx_pic->pp),
422 &ctx_pic->qm, sizeof(ctx_pic->qm),
423 commit_bitstream_and_slice_buffer);
426 AVHWAccel ff_h264_dxva2_hwaccel = {
427 .name = "h264_dxva2",
428 .type = AVMEDIA_TYPE_VIDEO,
430 .pix_fmt = PIX_FMT_DXVA2_VLD,
432 .start_frame = start_frame,
433 .decode_slice = decode_slice,
434 .end_frame = end_frame,
435 .priv_data_size = sizeof(struct dxva2_picture_context),