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 */ 39static 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 */ 55static 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). */ 82typedef 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 */ 94static 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. */ 125static 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 */ 159static 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 */ 188static 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. */ 226static 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 304fail: 305 ff_vaapi_decode_cancel(avctx, pic); 306 return err; 307} 308 309/** End a hardware decoding based frame. */ 310static 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 323finish: 324 return ret; 325} 326 327/** Decode the given H.264 slice with VA API. */ 328static 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 388const 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}; 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