2dd45e74286283f10dcc3cd9bee068556efd7113
[libav.git] / libavcodec / vaapi_h264.c
1 /*
2 * H.264 HW decode acceleration through VA API
3 *
4 * Copyright (C) 2008-2009 Splitted-Desktop Systems
5 *
6 * This file is part of Libav.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 #include "vaapi_internal.h"
24 #include "h264dec.h"
25 #include "h264_ps.h"
26 #include "mpegutils.h"
27
28 /**
29 * @file
30 * This file implements the glue code between Libav's and VA API's
31 * structures for H.264 decoding.
32 */
33
34 /**
35 * Initialize an empty VA API picture.
36 *
37 * VA API requires a fixed-size reference picture array.
38 */
39 static void init_vaapi_pic(VAPictureH264 *va_pic)
40 {
41 va_pic->picture_id = VA_INVALID_ID;
42 va_pic->flags = VA_PICTURE_H264_INVALID;
43 va_pic->TopFieldOrderCnt = 0;
44 va_pic->BottomFieldOrderCnt = 0;
45 }
46
47 /**
48 * Translate an Libav Picture into its VA API form.
49 *
50 * @param[out] va_pic A pointer to VA API's own picture struct
51 * @param[in] pic A pointer to the Libav picture struct to convert
52 * @param[in] pic_structure The picture field type (as defined in mpegvideo.h),
53 * supersedes pic's field type if nonzero.
54 */
55 static void fill_vaapi_pic(VAPictureH264 *va_pic,
56 const H264Picture *pic,
57 int pic_structure)
58 {
59 if (pic_structure == 0)
60 pic_structure = pic->reference;
61 pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
62
63 va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
64 va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
65
66 va_pic->flags = 0;
67 if (pic_structure != PICT_FRAME)
68 va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
69 if (pic->reference)
70 va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
71
72 va_pic->TopFieldOrderCnt = 0;
73 if (pic->field_poc[0] != INT_MAX)
74 va_pic->TopFieldOrderCnt = pic->field_poc[0];
75
76 va_pic->BottomFieldOrderCnt = 0;
77 if (pic->field_poc[1] != INT_MAX)
78 va_pic->BottomFieldOrderCnt = pic->field_poc[1];
79 }
80
81 /** Decoded Picture Buffer (DPB). */
82 typedef struct DPB {
83 int size; ///< Current number of reference frames in the DPB
84 int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
85 VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
86 } DPB;
87
88 /**
89 * Append picture to the decoded picture buffer, in a VA API form that
90 * merges the second field picture attributes with the first, if
91 * available. The decoded picture buffer's size must be large enough
92 * to receive the new VA API picture object.
93 */
94 static int dpb_add(DPB *dpb, const H264Picture *pic)
95 {
96 int i;
97
98 if (dpb->size >= dpb->max_size)
99 return -1;
100
101 for (i = 0; i < dpb->size; i++) {
102 VAPictureH264 * const va_pic = &dpb->va_pics[i];
103 if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
104 VAPictureH264 temp_va_pic;
105 fill_vaapi_pic(&temp_va_pic, pic, 0);
106
107 if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
108 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
109 /* Merge second field */
110 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
111 va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt;
112 } else {
113 va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
114 }
115 }
116 return 0;
117 }
118 }
119
120 fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
121 return 0;
122 }
123
124 /** Fill in VA API reference frames array. */
125 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
126 const H264Context *h)
127 {
128 DPB dpb;
129 int i;
130
131 dpb.size = 0;
132 dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
133 dpb.va_pics = pic_param->ReferenceFrames;
134 for (i = 0; i < dpb.max_size; i++)
135 init_vaapi_pic(&dpb.va_pics[i]);
136
137 for (i = 0; i < h->short_ref_count; i++) {
138 const H264Picture *pic = h->short_ref[i];
139 if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
140 return -1;
141 }
142
143 for (i = 0; i < 16; i++) {
144 const H264Picture *pic = h->long_ref[i];
145 if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
146 return -1;
147 }
148 return 0;
149 }
150
151 /**
152 * Fill in VA API reference picture lists from the Libav reference
153 * picture list.
154 *
155 * @param[out] RefPicList VA API internal reference picture list
156 * @param[in] ref_list A pointer to the Libav reference list
157 * @param[in] ref_count The number of reference pictures in ref_list
158 */
159 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
160 const H264Ref *ref_list,
161 unsigned int ref_count)
162 {
163 unsigned int i, n = 0;
164 for (i = 0; i < ref_count; i++)
165 if (ref_list[i].reference)
166 fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent, 0);
167
168 for (; n < 32; n++)
169 init_vaapi_pic(&RefPicList[n]);
170 }
171
172 /**
173 * Fill in prediction weight table.
174 *
175 * VA API requires a plain prediction weight table as it does not infer
176 * any value.
177 *
178 * @param[in] h A pointer to the current H.264 context
179 * @param[in] list The reference frame list index to use
180 * @param[out] luma_weight_flag VA API plain luma weight flag
181 * @param[out] luma_weight VA API plain luma weight table
182 * @param[out] luma_offset VA API plain luma offset table
183 * @param[out] chroma_weight_flag VA API plain chroma weight flag
184 * @param[out] chroma_weight VA API plain chroma weight table
185 * @param[out] chroma_offset VA API plain chroma offset table
186 */
187 static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
188 int list,
189 unsigned char *luma_weight_flag,
190 short luma_weight[32],
191 short luma_offset[32],
192 unsigned char *chroma_weight_flag,
193 short chroma_weight[32][2],
194 short chroma_offset[32][2])
195 {
196 const H264SliceContext *sl = &h->slice_ctx[0];
197 unsigned int i, j;
198
199 *luma_weight_flag = sl->pwt.luma_weight_flag[list];
200 *chroma_weight_flag = sl->pwt.chroma_weight_flag[list];
201
202 for (i = 0; i < sl->ref_count[list]; i++) {
203 /* VA API also wants the inferred (default) values, not
204 only what is available in the bitstream (7.4.3.2). */
205 if (sl->pwt.luma_weight_flag[list]) {
206 luma_weight[i] = sl->pwt.luma_weight[i][list][0];
207 luma_offset[i] = sl->pwt.luma_weight[i][list][1];
208 } else {
209 luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
210 luma_offset[i] = 0;
211 }
212 for (j = 0; j < 2; j++) {
213 if (sl->pwt.chroma_weight_flag[list]) {
214 chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
215 chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
216 } else {
217 chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
218 chroma_offset[i][j] = 0;
219 }
220 }
221 }
222 }
223
224 /** Initialize and start decoding a frame with VA API. */
225 static int vaapi_h264_start_frame(AVCodecContext *avctx,
226 av_unused const uint8_t *buffer,
227 av_unused uint32_t size)
228 {
229 const H264Context *h = avctx->priv_data;
230 struct vaapi_context * const vactx = avctx->hwaccel_context;
231 const PPS *pps = h->ps.pps;
232 const SPS *sps = h->ps.sps;
233 VAPictureParameterBufferH264 *pic_param;
234 VAIQMatrixBufferH264 *iq_matrix;
235
236 vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
237
238 /* Fill in VAPictureParameterBufferH264. */
239 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
240 if (!pic_param)
241 return -1;
242 fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure);
243 if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
244 return -1;
245 pic_param->picture_width_in_mbs_minus1 = h->mb_width - 1;
246 pic_param->picture_height_in_mbs_minus1 = h->mb_height - 1;
247 pic_param->bit_depth_luma_minus8 = sps->bit_depth_luma - 8;
248 pic_param->bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8;
249 pic_param->num_ref_frames = sps->ref_frame_count;
250 pic_param->seq_fields.value = 0; /* reset all bits */
251 pic_param->seq_fields.bits.chroma_format_idc = sps->chroma_format_idc;
252 pic_param->seq_fields.bits.residual_colour_transform_flag = sps->residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
253 pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag;
254 pic_param->seq_fields.bits.frame_mbs_only_flag = sps->frame_mbs_only_flag;
255 pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = sps->mb_aff;
256 pic_param->seq_fields.bits.direct_8x8_inference_flag = sps->direct_8x8_inference_flag;
257 pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = sps->level_idc >= 31; /* A.3.3.2 */
258 pic_param->seq_fields.bits.log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4;
259 pic_param->seq_fields.bits.pic_order_cnt_type = sps->poc_type;
260 pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
261 pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
262 pic_param->num_slice_groups_minus1 = pps->slice_group_count - 1;
263 pic_param->slice_group_map_type = pps->mb_slice_group_map_type;
264 pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in Libav */
265 pic_param->pic_init_qp_minus26 = pps->init_qp - 26;
266 pic_param->pic_init_qs_minus26 = pps->init_qs - 26;
267 pic_param->chroma_qp_index_offset = pps->chroma_qp_index_offset[0];
268 pic_param->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];
269 pic_param->pic_fields.value = 0; /* reset all bits */
270 pic_param->pic_fields.bits.entropy_coding_mode_flag = pps->cabac;
271 pic_param->pic_fields.bits.weighted_pred_flag = pps->weighted_pred;
272 pic_param->pic_fields.bits.weighted_bipred_idc = pps->weighted_bipred_idc;
273 pic_param->pic_fields.bits.transform_8x8_mode_flag = pps->transform_8x8_mode;
274 pic_param->pic_fields.bits.field_pic_flag = h->picture_structure != PICT_FRAME;
275 pic_param->pic_fields.bits.constrained_intra_pred_flag = pps->constrained_intra_pred;
276 pic_param->pic_fields.bits.pic_order_present_flag = pps->pic_order_present;
277 pic_param->pic_fields.bits.deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
278 pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present;
279 pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0;
280 pic_param->frame_num = h->poc.frame_num;
281
282 /* Fill in VAIQMatrixBufferH264. */
283 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
284 if (!iq_matrix)
285 return -1;
286 memcpy(iq_matrix->ScalingList4x4, pps->scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
287 memcpy(iq_matrix->ScalingList8x8[0], pps->scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
288 memcpy(iq_matrix->ScalingList8x8[1], pps->scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
289 return 0;
290 }
291
292 /** End a hardware decoding based frame. */
293 static int vaapi_h264_end_frame(AVCodecContext *avctx)
294 {
295 struct vaapi_context * const vactx = avctx->hwaccel_context;
296 const H264Context *h = avctx->priv_data;
297 H264SliceContext *sl = &h->slice_ctx[0];
298 int ret;
299
300 ret = ff_vaapi_commit_slices(vactx);
301 if (ret < 0)
302 goto finish;
303
304 ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->cur_pic_ptr->f));
305 if (ret < 0)
306 goto finish;
307
308 ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
309
310 finish:
311 ff_vaapi_common_end_frame(avctx);
312 return ret;
313 }
314
315 /** Decode the given H.264 slice with VA API. */
316 static int vaapi_h264_decode_slice(AVCodecContext *avctx,
317 const uint8_t *buffer,
318 uint32_t size)
319 {
320 const H264Context *h = avctx->priv_data;
321 const H264SliceContext *sl = &h->slice_ctx[0];
322 VASliceParameterBufferH264 *slice_param;
323
324 /* Fill in VASliceParameterBufferH264. */
325 slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
326 if (!slice_param)
327 return -1;
328 slice_param->slice_data_bit_offset = get_bits_count(&sl->gb);
329 slice_param->first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
330 slice_param->slice_type = ff_h264_get_slice_type(sl);
331 slice_param->direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0;
332 slice_param->num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0;
333 slice_param->num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0;
334 slice_param->cabac_init_idc = sl->cabac_init_idc;
335 slice_param->slice_qp_delta = sl->qscale - h->ps.pps->init_qp;
336 slice_param->disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter;
337 slice_param->slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2;
338 slice_param->slice_beta_offset_div2 = sl->slice_beta_offset / 2;
339 slice_param->luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom;
340 slice_param->chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom;
341
342 fill_vaapi_RefPicList(slice_param->RefPicList0, sl->ref_list[0], sl->list_count > 0 ? sl->ref_count[0] : 0);
343 fill_vaapi_RefPicList(slice_param->RefPicList1, sl->ref_list[1], sl->list_count > 1 ? sl->ref_count[1] : 0);
344
345 fill_vaapi_plain_pred_weight_table(h, 0,
346 &slice_param->luma_weight_l0_flag, slice_param->luma_weight_l0, slice_param->luma_offset_l0,
347 &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0);
348 fill_vaapi_plain_pred_weight_table(h, 1,
349 &slice_param->luma_weight_l1_flag, slice_param->luma_weight_l1, slice_param->luma_offset_l1,
350 &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
351 return 0;
352 }
353
354 AVHWAccel ff_h264_vaapi_hwaccel = {
355 .name = "h264_vaapi",
356 .type = AVMEDIA_TYPE_VIDEO,
357 .id = AV_CODEC_ID_H264,
358 .pix_fmt = AV_PIX_FMT_VAAPI,
359 .start_frame = vaapi_h264_start_frame,
360 .end_frame = vaapi_h264_end_frame,
361 .decode_slice = vaapi_h264_decode_slice,
362 };