FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vaapi_h264.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 0 173 0.0%
Branches: 0 84 0.0%

Line Branch Exec Source
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 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 "h264dec.h"
24 #include "h264_ps.h"
25 #include "hwconfig.h"
26 #include "vaapi_decode.h"
27
28 /**
29 * @file
30 * This file implements the glue code between FFmpeg'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 FFmpeg 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 FFmpeg 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 FFmpeg reference
153 * picture list.
154 *
155 * @param[out] RefPicList VA API internal reference picture list
156 * @param[in] ref_list A pointer to the FFmpeg 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,
167 ref_list[i].reference);
168
169 for (; n < 32; n++)
170 init_vaapi_pic(&RefPicList[n]);
171 }
172
173 /**
174 * Fill in prediction weight table.
175 *
176 * VA API requires a plain prediction weight table as it does not infer
177 * any value.
178 *
179 * @param[in] h A pointer to the current H.264 context
180 * @param[in] list The reference frame list index to use
181 * @param[out] luma_weight_flag VA API plain luma weight flag
182 * @param[out] luma_weight VA API plain luma weight table
183 * @param[out] luma_offset VA API plain luma offset table
184 * @param[out] chroma_weight_flag VA API plain chroma weight flag
185 * @param[out] chroma_weight VA API plain chroma weight table
186 * @param[out] chroma_offset VA API plain chroma offset table
187 */
188 static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
189 int list,
190 unsigned char *luma_weight_flag,
191 short luma_weight[32],
192 short luma_offset[32],
193 unsigned char *chroma_weight_flag,
194 short chroma_weight[32][2],
195 short chroma_offset[32][2])
196 {
197 const H264SliceContext *sl = &h->slice_ctx[0];
198 unsigned int i, j;
199
200 *luma_weight_flag = sl->pwt.luma_weight_flag[list];
201 *chroma_weight_flag = sl->pwt.chroma_weight_flag[list];
202
203 for (i = 0; i < sl->ref_count[list]; i++) {
204 /* VA API also wants the inferred (default) values, not
205 only what is available in the bitstream (7.4.3.2). */
206 if (sl->pwt.luma_weight_flag[list]) {
207 luma_weight[i] = sl->pwt.luma_weight[i][list][0];
208 luma_offset[i] = sl->pwt.luma_weight[i][list][1];
209 } else {
210 luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
211 luma_offset[i] = 0;
212 }
213 for (j = 0; j < 2; j++) {
214 if (sl->pwt.chroma_weight_flag[list]) {
215 chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
216 chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
217 } else {
218 chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
219 chroma_offset[i][j] = 0;
220 }
221 }
222 }
223 }
224
225 /** Initialize and start decoding a frame with VA API. */
226 static int vaapi_h264_start_frame(AVCodecContext *avctx,
227 av_unused const uint8_t *buffer,
228 av_unused uint32_t size)
229 {
230 const H264Context *h = avctx->priv_data;
231 VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
232 const PPS *pps = h->ps.pps;
233 const SPS *sps = h->ps.sps;
234 VAPictureParameterBufferH264 pic_param;
235 VAIQMatrixBufferH264 iq_matrix;
236 int err;
237
238 pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f);
239
240 pic_param = (VAPictureParameterBufferH264) {
241 .picture_width_in_mbs_minus1 = h->mb_width - 1,
242 .picture_height_in_mbs_minus1 = h->mb_height - 1,
243 .bit_depth_luma_minus8 = sps->bit_depth_luma - 8,
244 .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
245 .num_ref_frames = sps->ref_frame_count,
246 .seq_fields.bits = {
247 .chroma_format_idc = sps->chroma_format_idc,
248 .residual_colour_transform_flag = sps->residual_color_transform_flag,
249 .gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag,
250 .frame_mbs_only_flag = sps->frame_mbs_only_flag,
251 .mb_adaptive_frame_field_flag = sps->mb_aff,
252 .direct_8x8_inference_flag = sps->direct_8x8_inference_flag,
253 .MinLumaBiPredSize8x8 = sps->level_idc >= 31, /* A.3.3.2 */
254 .log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4,
255 .pic_order_cnt_type = sps->poc_type,
256 .log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4,
257 .delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag,
258 },
259 .pic_init_qp_minus26 = pps->init_qp - 26,
260 .pic_init_qs_minus26 = pps->init_qs - 26,
261 .chroma_qp_index_offset = pps->chroma_qp_index_offset[0],
262 .second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1],
263 .pic_fields.bits = {
264 .entropy_coding_mode_flag = pps->cabac,
265 .weighted_pred_flag = pps->weighted_pred,
266 .weighted_bipred_idc = pps->weighted_bipred_idc,
267 .transform_8x8_mode_flag = pps->transform_8x8_mode,
268 .field_pic_flag = h->picture_structure != PICT_FRAME,
269 .constrained_intra_pred_flag = pps->constrained_intra_pred,
270 .pic_order_present_flag = pps->pic_order_present,
271 .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
272 .redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present,
273 .reference_pic_flag = h->nal_ref_idc != 0,
274 },
275 .frame_num = h->poc.frame_num,
276 };
277
278 fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure);
279 err = fill_vaapi_ReferenceFrames(&pic_param, h);
280 if (err < 0)
281 goto fail;
282
283 err = ff_vaapi_decode_make_param_buffer(avctx, pic,
284 VAPictureParameterBufferType,
285 &pic_param, sizeof(pic_param));
286 if (err < 0)
287 goto fail;
288
289 memcpy(iq_matrix.ScalingList4x4,
290 pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4));
291 memcpy(iq_matrix.ScalingList8x8[0],
292 pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0]));
293 memcpy(iq_matrix.ScalingList8x8[1],
294 pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0]));
295
296 err = ff_vaapi_decode_make_param_buffer(avctx, pic,
297 VAIQMatrixBufferType,
298 &iq_matrix, sizeof(iq_matrix));
299 if (err < 0)
300 goto fail;
301
302 return 0;
303
304 fail:
305 ff_vaapi_decode_cancel(avctx, pic);
306 return err;
307 }
308
309 /** End a hardware decoding based frame. */
310 static int vaapi_h264_end_frame(AVCodecContext *avctx)
311 {
312 const H264Context *h = avctx->priv_data;
313 VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
314 H264SliceContext *sl = &h->slice_ctx[0];
315 int ret;
316
317 ret = ff_vaapi_decode_issue(avctx, pic);
318 if (ret < 0)
319 goto finish;
320
321 ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
322
323 finish:
324 return ret;
325 }
326
327 /** Decode the given H.264 slice with VA API. */
328 static int vaapi_h264_decode_slice(AVCodecContext *avctx,
329 const uint8_t *buffer,
330 uint32_t size)
331 {
332 const H264Context *h = avctx->priv_data;
333 VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
334 const H264SliceContext *sl = &h->slice_ctx[0];
335 VASliceParameterBufferH264 slice_param;
336 int err;
337
338 slice_param = (VASliceParameterBufferH264) {
339 .slice_data_size = size,
340 .slice_data_offset = 0,
341 .slice_data_flag = VA_SLICE_DATA_FLAG_ALL,
342 .slice_data_bit_offset = get_bits_count(&sl->gb),
343 .first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x,
344 .slice_type = ff_h264_get_slice_type(sl),
345 .direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0,
346 .num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
347 .num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
348 .cabac_init_idc = sl->cabac_init_idc,
349 .slice_qp_delta = sl->qscale - h->ps.pps->init_qp,
350 .disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
351 .slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2,
352 .slice_beta_offset_div2 = sl->slice_beta_offset / 2,
353 .luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom,
354 .chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom,
355 };
356
357 fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0],
358 sl->list_count > 0 ? sl->ref_count[0] : 0);
359 fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1],
360 sl->list_count > 1 ? sl->ref_count[1] : 0);
361
362 fill_vaapi_plain_pred_weight_table(h, 0,
363 &slice_param.luma_weight_l0_flag,
364 slice_param.luma_weight_l0,
365 slice_param.luma_offset_l0,
366 &slice_param.chroma_weight_l0_flag,
367 slice_param.chroma_weight_l0,
368 slice_param.chroma_offset_l0);
369 fill_vaapi_plain_pred_weight_table(h, 1,
370 &slice_param.luma_weight_l1_flag,
371 slice_param.luma_weight_l1,
372 slice_param.luma_offset_l1,
373 &slice_param.chroma_weight_l1_flag,
374 slice_param.chroma_weight_l1,
375 slice_param.chroma_offset_l1);
376
377 err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
378 &slice_param, sizeof(slice_param),
379 buffer, size);
380 if (err) {
381 ff_vaapi_decode_cancel(avctx, pic);
382 return err;
383 }
384
385 return 0;
386 }
387
388 const AVHWAccel ff_h264_vaapi_hwaccel = {
389 .name = "h264_vaapi",
390 .type = AVMEDIA_TYPE_VIDEO,
391 .id = AV_CODEC_ID_H264,
392 .pix_fmt = AV_PIX_FMT_VAAPI,
393 .start_frame = &vaapi_h264_start_frame,
394 .end_frame = &vaapi_h264_end_frame,
395 .decode_slice = &vaapi_h264_decode_slice,
396 .frame_priv_data_size = sizeof(VAAPIDecodePicture),
397 .init = &ff_vaapi_decode_init,
398 .uninit = &ff_vaapi_decode_uninit,
399 .frame_params = &ff_vaapi_common_frame_params,
400 .priv_data_size = sizeof(VAAPIDecodeContext),
401 .caps_internal = HWACCEL_CAP_ASYNC_SAFE,
402 };
403