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 "vaapi_internal.h" 24#include "h264.h" 25#include "mpegutils.h" 26 27/** 28 * @file 29 * This file implements the glue code between FFmpeg's and VA API's 30 * structures for H.264 decoding. 31 */ 32 33/** 34 * Initialize an empty VA API picture. 35 * 36 * VA API requires a fixed-size reference picture array. 37 */ 38static void init_vaapi_pic(VAPictureH264 *va_pic) 39{ 40 va_pic->picture_id = VA_INVALID_ID; 41 va_pic->flags = VA_PICTURE_H264_INVALID; 42 va_pic->TopFieldOrderCnt = 0; 43 va_pic->BottomFieldOrderCnt = 0; 44} 45 46/** 47 * Translate an FFmpeg Picture into its VA API form. 48 * 49 * @param[out] va_pic A pointer to VA API's own picture struct 50 * @param[in] pic A pointer to the FFmpeg picture struct to convert 51 * @param[in] pic_structure The picture field type (as defined in mpegvideo.h), 52 * supersedes pic's field type if nonzero. 53 */ 54static void fill_vaapi_pic(VAPictureH264 *va_pic, 55 H264Picture *pic, 56 int pic_structure) 57{ 58 if (pic_structure == 0) 59 pic_structure = pic->reference; 60 pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */ 61 62 va_pic->picture_id = ff_vaapi_get_surface_id(&pic->f); 63 va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num; 64 65 va_pic->flags = 0; 66 if (pic_structure != PICT_FRAME) 67 va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD; 68 if (pic->reference) 69 va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE; 70 71 va_pic->TopFieldOrderCnt = 0; 72 if (pic->field_poc[0] != INT_MAX) 73 va_pic->TopFieldOrderCnt = pic->field_poc[0]; 74 75 va_pic->BottomFieldOrderCnt = 0; 76 if (pic->field_poc[1] != INT_MAX) 77 va_pic->BottomFieldOrderCnt = pic->field_poc[1]; 78} 79 80/** Decoded Picture Buffer (DPB). */ 81typedef struct DPB { 82 int size; ///< Current number of reference frames in the DPB 83 int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames) 84 VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array 85} DPB; 86 87/** 88 * Append picture to the decoded picture buffer, in a VA API form that 89 * merges the second field picture attributes with the first, if 90 * available. The decoded picture buffer's size must be large enough 91 * to receive the new VA API picture object. 92 */ 93static int dpb_add(DPB *dpb, H264Picture *pic) 94{ 95 int i; 96 97 if (dpb->size >= dpb->max_size) 98 return -1; 99 100 for (i = 0; i < dpb->size; i++) { 101 VAPictureH264 * const va_pic = &dpb->va_pics[i]; 102 if (va_pic->picture_id == ff_vaapi_get_surface_id(&pic->f)) { 103 VAPictureH264 temp_va_pic; 104 fill_vaapi_pic(&temp_va_pic, pic, 0); 105 106 if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) { 107 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD); 108 /* Merge second field */ 109 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) { 110 va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt; 111 } else { 112 va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt; 113 } 114 } 115 return 0; 116 } 117 } 118 119 fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0); 120 return 0; 121} 122 123/** Fill in VA API reference frames array. */ 124static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param, 125 H264Context *h) 126{ 127 DPB dpb; 128 int i; 129 130 dpb.size = 0; 131 dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames); 132 dpb.va_pics = pic_param->ReferenceFrames; 133 for (i = 0; i < dpb.max_size; i++) 134 init_vaapi_pic(&dpb.va_pics[i]); 135 136 for (i = 0; i < h->short_ref_count; i++) { 137 H264Picture * const pic = h->short_ref[i]; 138 if (pic && pic->reference && dpb_add(&dpb, pic) < 0) 139 return -1; 140 } 141 142 for (i = 0; i < 16; i++) { 143 H264Picture * const pic = h->long_ref[i]; 144 if (pic && pic->reference && dpb_add(&dpb, pic) < 0) 145 return -1; 146 } 147 return 0; 148} 149 150/** 151 * Fill in VA API reference picture lists from the FFmpeg reference 152 * picture list. 153 * 154 * @param[out] RefPicList VA API internal reference picture list 155 * @param[in] ref_list A pointer to the FFmpeg reference list 156 * @param[in] ref_count The number of reference pictures in ref_list 157 */ 158static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32], 159 H264Picture *ref_list, 160 unsigned int ref_count) 161{ 162 unsigned int i, n = 0; 163 for (i = 0; i < ref_count; i++) 164 if (ref_list[i].reference) 165 fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0); 166 167 for (; n < 32; n++) 168 init_vaapi_pic(&RefPicList[n]); 169} 170 171/** 172 * Fill in prediction weight table. 173 * 174 * VA API requires a plain prediction weight table as it does not infer 175 * any value. 176 * 177 * @param[in] h A pointer to the current H.264 context 178 * @param[in] list The reference frame list index to use 179 * @param[out] luma_weight_flag VA API plain luma weight flag 180 * @param[out] luma_weight VA API plain luma weight table 181 * @param[out] luma_offset VA API plain luma offset table 182 * @param[out] chroma_weight_flag VA API plain chroma weight flag 183 * @param[out] chroma_weight VA API plain chroma weight table 184 * @param[out] chroma_offset VA API plain chroma offset table 185 */ 186static void fill_vaapi_plain_pred_weight_table(H264Context *h, 187 int list, 188 unsigned char *luma_weight_flag, 189 short luma_weight[32], 190 short luma_offset[32], 191 unsigned char *chroma_weight_flag, 192 short chroma_weight[32][2], 193 short chroma_offset[32][2]) 194{ 195 unsigned int i, j; 196 197 *luma_weight_flag = h->luma_weight_flag[list]; 198 *chroma_weight_flag = h->chroma_weight_flag[list]; 199 200 for (i = 0; i < h->ref_count[list]; i++) { 201 /* VA API also wants the inferred (default) values, not 202 only what is available in the bitstream (7.4.3.2). */ 203 if (h->luma_weight_flag[list]) { 204 luma_weight[i] = h->luma_weight[i][list][0]; 205 luma_offset[i] = h->luma_weight[i][list][1]; 206 } else { 207 luma_weight[i] = 1 << h->luma_log2_weight_denom; 208 luma_offset[i] = 0; 209 } 210 for (j = 0; j < 2; j++) { 211 if (h->chroma_weight_flag[list]) { 212 chroma_weight[i][j] = h->chroma_weight[i][list][j][0]; 213 chroma_offset[i][j] = h->chroma_weight[i][list][j][1]; 214 } else { 215 chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom; 216 chroma_offset[i][j] = 0; 217 } 218 } 219 } 220} 221 222/** Initialize and start decoding a frame with VA API. */ 223static int vaapi_h264_start_frame(AVCodecContext *avctx, 224 av_unused const uint8_t *buffer, 225 av_unused uint32_t size) 226{ 227 H264Context * const h = avctx->priv_data; 228 struct vaapi_context * const vactx = avctx->hwaccel_context; 229 VAPictureParameterBufferH264 *pic_param; 230 VAIQMatrixBufferH264 *iq_matrix; 231 232 av_dlog(avctx, "vaapi_h264_start_frame()\n"); 233 234 vactx->slice_param_size = sizeof(VASliceParameterBufferH264); 235 236 /* Fill in VAPictureParameterBufferH264. */ 237 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264)); 238 if (!pic_param) 239 return -1; 240 fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure); 241 if (fill_vaapi_ReferenceFrames(pic_param, h) < 0) 242 return -1; 243 pic_param->picture_width_in_mbs_minus1 = h->mb_width - 1; 244 pic_param->picture_height_in_mbs_minus1 = h->mb_height - 1; 245 pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8; 246 pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8; 247 pic_param->num_ref_frames = h->sps.ref_frame_count; 248 pic_param->seq_fields.value = 0; /* reset all bits */ 249 pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc; 250 pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */ 251 pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag; 252 pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag; 253 pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff; 254 pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag; 255 pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */ 256 pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4; 257 pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type; 258 pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4; 259 pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag; 260 pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1; 261 pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type; 262 pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */ 263 pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26; 264 pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26; 265 pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0]; 266 pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1]; 267 pic_param->pic_fields.value = 0; /* reset all bits */ 268 pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac; 269 pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred; 270 pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc; 271 pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode; 272 pic_param->pic_fields.bits.field_pic_flag = h->picture_structure != PICT_FRAME; 273 pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred; 274 pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present; 275 pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present; 276 pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present; 277 pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0; 278 pic_param->frame_num = h->frame_num; 279 280 /* Fill in VAIQMatrixBufferH264. */ 281 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264)); 282 if (!iq_matrix) 283 return -1; 284 memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4)); 285 memcpy(iq_matrix->ScalingList8x8[0], h->pps.scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0])); 286 memcpy(iq_matrix->ScalingList8x8[1], h->pps.scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0])); 287 return 0; 288} 289 290/** End a hardware decoding based frame. */ 291static int vaapi_h264_end_frame(AVCodecContext *avctx) 292{ 293 struct vaapi_context * const vactx = avctx->hwaccel_context; 294 H264Context * const h = avctx->priv_data; 295 int ret; 296 297 av_dlog(avctx, "vaapi_h264_end_frame()\n"); 298 ret = ff_vaapi_commit_slices(vactx); 299 if (ret < 0) 300 goto finish; 301 302 ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(&h->cur_pic_ptr->f)); 303 if (ret < 0) 304 goto finish; 305 306 ff_h264_draw_horiz_band(h, 0, h->avctx->height); 307 308finish: 309 ff_vaapi_common_end_frame(avctx); 310 return ret; 311} 312 313/** Decode the given H.264 slice with VA API. */ 314static int vaapi_h264_decode_slice(AVCodecContext *avctx, 315 const uint8_t *buffer, 316 uint32_t size) 317{ 318 H264Context * const h = avctx->priv_data; 319 VASliceParameterBufferH264 *slice_param; 320 321 av_dlog(avctx, "vaapi_h264_decode_slice(): buffer %p, size %d\n", 322 buffer, size); 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(&h->gb) + 8; /* bit buffer started beyond nal_unit_type */ 329 slice_param->first_mb_in_slice = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x; 330 slice_param->slice_type = ff_h264_get_slice_type(h); 331 slice_param->direct_spatial_mv_pred_flag = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0; 332 slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0; 333 slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0; 334 slice_param->cabac_init_idc = h->cabac_init_idc; 335 slice_param->slice_qp_delta = h->qscale - h->pps.init_qp; 336 slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter; 337 slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2; 338 slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2; 339 slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom; 340 slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom; 341 342 fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0); 343 fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->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 354AVHWAccel 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_VLD, 359 .start_frame = vaapi_h264_start_frame, 360 .end_frame = vaapi_h264_end_frame, 361 .decode_slice = vaapi_h264_decode_slice, 362}; 363