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 26/** @file 27 * This file implements the glue code between FFmpeg's and VA API's 28 * structures for H.264 decoding. 29 */ 30 31/** 32 * Initializes an empty VA API picture. 33 * 34 * VA API requires a fixed-size reference picture array. 35 */ 36static void init_vaapi_pic(VAPictureH264 *va_pic) 37{ 38 va_pic->picture_id = VA_INVALID_ID; 39 va_pic->flags = VA_PICTURE_H264_INVALID; 40 va_pic->TopFieldOrderCnt = 0; 41 va_pic->BottomFieldOrderCnt = 0; 42} 43 44/** 45 * Translates an FFmpeg Picture into its VA API form. 46 * 47 * @param[out] va_pic A pointer to VA API's own picture struct 48 * @param[in] pic A pointer to the FFmpeg picture struct to convert 49 * @param[in] pic_structure The picture field type (as defined in mpegvideo.h), 50 * supersedes pic's field type if nonzero. 51 */ 52static void fill_vaapi_pic(VAPictureH264 *va_pic, 53 Picture *pic, 54 int pic_structure) 55{ 56 if (pic_structure == 0) 57 pic_structure = pic->reference; 58 59 va_pic->picture_id = ff_vaapi_get_surface_id(pic); 60 va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num; 61 62 va_pic->flags = 0; 63 if (pic_structure != PICT_FRAME) 64 va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD; 65 if (pic->reference) 66 va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE; 67 68 va_pic->TopFieldOrderCnt = 0; 69 if (pic->field_poc[0] != INT_MAX) 70 va_pic->TopFieldOrderCnt = pic->field_poc[0]; 71 72 va_pic->BottomFieldOrderCnt = 0; 73 if (pic->field_poc[1] != INT_MAX) 74 va_pic->BottomFieldOrderCnt = pic->field_poc[1]; 75} 76 77/** Decoded Picture Buffer (DPB). */ 78typedef struct DPB { 79 int size; ///< Current number of reference frames in the DPB 80 int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames) 81 VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array 82} DPB; 83 84/** 85 * Appends picture to the decoded picture buffer, in a VA API form that 86 * merges the second field picture attributes with the first, if 87 * available. The decoded picture buffer's size must be large enough 88 * to receive the new VA API picture object. 89 */ 90static int dpb_add(DPB *dpb, Picture *pic) 91{ 92 int i; 93 94 if (dpb->size >= dpb->max_size) 95 return -1; 96 97 for (i = 0; i < dpb->size; i++) { 98 VAPictureH264 * const va_pic = &dpb->va_pics[i]; 99 if (va_pic->picture_id == ff_vaapi_get_surface_id(pic)) { 100 VAPictureH264 temp_va_pic; 101 fill_vaapi_pic(&temp_va_pic, pic, 0); 102 103 if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) { 104 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD); 105 /* Merge second field */ 106 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) { 107 va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt; 108 } else { 109 va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt; 110 } 111 } 112 return 0; 113 } 114 } 115 116 fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0); 117 return 0; 118} 119 120/** Fills in VA API reference frames array. */ 121static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param, 122 H264Context *h) 123{ 124 DPB dpb; 125 int i; 126 127 dpb.size = 0; 128 dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames); 129 dpb.va_pics = pic_param->ReferenceFrames; 130 for (i = 0; i < dpb.max_size; i++) 131 init_vaapi_pic(&dpb.va_pics[i]); 132 133 for (i = 0; i < h->short_ref_count; i++) { 134 Picture * const pic = h->short_ref[i]; 135 if (pic && pic->reference && dpb_add(&dpb, pic) < 0) 136 return -1; 137 } 138 139 for (i = 0; i < 16; i++) { 140 Picture * const pic = h->long_ref[i]; 141 if (pic && pic->reference && dpb_add(&dpb, pic) < 0) 142 return -1; 143 } 144 return 0; 145} 146 147/** 148 * Fills in VA API reference picture lists from the FFmpeg reference 149 * picture list. 150 * 151 * @param[out] RefPicList VA API internal reference picture list 152 * @param[in] ref_list A pointer to the FFmpeg reference list 153 * @param[in] ref_count The number of reference pictures in ref_list 154 */ 155static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32], 156 Picture *ref_list, 157 unsigned int ref_count) 158{ 159 unsigned int i, n = 0; 160 for (i = 0; i < ref_count; i++) 161 if (ref_list[i].reference) 162 fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0); 163 164 for (; n < 32; n++) 165 init_vaapi_pic(&RefPicList[n]); 166} 167 168/** 169 * Fills in prediction weight table. 170 * 171 * VA API requires a plain prediction weight table as it does not infer 172 * any value. 173 * 174 * @param[in] h A pointer to the current H.264 context 175 * @param[in] list The reference frame list index to use 176 * @param[out] luma_weight_flag VA API plain luma weight flag 177 * @param[out] luma_weight VA API plain luma weight table 178 * @param[out] luma_offset VA API plain luma offset table 179 * @param[out] chroma_weight_flag VA API plain chroma weight flag 180 * @param[out] chroma_weight VA API plain chroma weight table 181 * @param[out] chroma_offset VA API plain chroma offset table 182 */ 183static void fill_vaapi_plain_pred_weight_table(H264Context *h, 184 int list, 185 unsigned char *luma_weight_flag, 186 short luma_weight[32], 187 short luma_offset[32], 188 unsigned char *chroma_weight_flag, 189 short chroma_weight[32][2], 190 short chroma_offset[32][2]) 191{ 192 unsigned int i, j; 193 194 *luma_weight_flag = h->luma_weight_flag[list]; 195 *chroma_weight_flag = h->chroma_weight_flag[list]; 196 197 for (i = 0; i < h->ref_count[list]; i++) { 198 /* VA API also wants the inferred (default) values, not 199 only what is available in the bitstream (7.4.3.2). */ 200 if (h->luma_weight_flag[list]) { 201 luma_weight[i] = h->luma_weight[i][list][0]; 202 luma_offset[i] = h->luma_weight[i][list][1]; 203 } else { 204 luma_weight[i] = 1 << h->luma_log2_weight_denom; 205 luma_offset[i] = 0; 206 } 207 for (j = 0; j < 2; j++) { 208 if (h->chroma_weight_flag[list]) { 209 chroma_weight[i][j] = h->chroma_weight[i][list][j][0]; 210 chroma_offset[i][j] = h->chroma_weight[i][list][j][1]; 211 } else { 212 chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom; 213 chroma_offset[i][j] = 0; 214 } 215 } 216 } 217} 218 219/** Initializes and starts decoding a frame with VA API. */ 220static int start_frame(AVCodecContext *avctx, 221 av_unused const uint8_t *buffer, 222 av_unused uint32_t size) 223{ 224 H264Context * const h = avctx->priv_data; 225 MpegEncContext * const s = &h->s; 226 struct vaapi_context * const vactx = avctx->hwaccel_context; 227 VAPictureParameterBufferH264 *pic_param; 228 VAIQMatrixBufferH264 *iq_matrix; 229 230 dprintf(avctx, "start_frame()\n"); 231 232 vactx->slice_param_size = sizeof(VASliceParameterBufferH264); 233 234 /* Fill in VAPictureParameterBufferH264. */ 235 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264)); 236 if (!pic_param) 237 return -1; 238 fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure); 239 if (fill_vaapi_ReferenceFrames(pic_param, h) < 0) 240 return -1; 241 pic_param->picture_width_in_mbs_minus1 = s->mb_width - 1; 242 pic_param->picture_height_in_mbs_minus1 = s->mb_height - 1; 243 pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8; 244 pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8; 245 pic_param->num_ref_frames = h->sps.ref_frame_count; 246 pic_param->seq_fields.value = 0; /* reset all bits */ 247 pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc; 248 pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */ 249 pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag; 250 pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag; 251 pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff; 252 pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag; 253 pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */ 254 pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4; 255 pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type; 256 pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4; 257 pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag; 258 pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1; 259 pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type; 260 pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */ 261 pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26; 262 pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26; 263 pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0]; 264 pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1]; 265 pic_param->pic_fields.value = 0; /* reset all bits */ 266 pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac; 267 pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred; 268 pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc; 269 pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode; 270 pic_param->pic_fields.bits.field_pic_flag = s->picture_structure != PICT_FRAME; 271 pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred; 272 pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present; 273 pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present; 274 pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present; 275 pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0; 276 pic_param->frame_num = h->frame_num; 277 278 /* Fill in VAIQMatrixBufferH264. */ 279 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264)); 280 if (!iq_matrix) 281 return -1; 282 memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4)); 283 memcpy(iq_matrix->ScalingList8x8, h->pps.scaling_matrix8, sizeof(iq_matrix->ScalingList8x8)); 284 return 0; 285} 286 287/** Ends a hardware decoding based frame. */ 288static int end_frame(AVCodecContext *avctx) 289{ 290 H264Context * const h = avctx->priv_data; 291 292 dprintf(avctx, "end_frame()\n"); 293 return ff_vaapi_common_end_frame(&h->s); 294} 295 296/** Decodes the given H.264 slice with VA API. */ 297static int decode_slice(AVCodecContext *avctx, 298 const uint8_t *buffer, 299 uint32_t size) 300{ 301 H264Context * const h = avctx->priv_data; 302 MpegEncContext * const s = &h->s; 303 VASliceParameterBufferH264 *slice_param; 304 305 dprintf(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size); 306 307 /* Fill in VASliceParameterBufferH264. */ 308 slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); 309 if (!slice_param) 310 return -1; 311 slice_param->slice_data_bit_offset = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */ 312 slice_param->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x; 313 slice_param->slice_type = ff_h264_get_slice_type(h); 314 slice_param->direct_spatial_mv_pred_flag = h->slice_type == FF_B_TYPE ? h->direct_spatial_mv_pred : 0; 315 slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0; 316 slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0; 317 slice_param->cabac_init_idc = h->cabac_init_idc; 318 slice_param->slice_qp_delta = s->qscale - h->pps.init_qp; 319 slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter; 320 slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26; 321 slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26; 322 slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom; 323 slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom; 324 325 fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0); 326 fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->ref_count[1] : 0); 327 328 fill_vaapi_plain_pred_weight_table(h, 0, 329 &slice_param->luma_weight_l0_flag, slice_param->luma_weight_l0, slice_param->luma_offset_l0, 330 &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0); 331 fill_vaapi_plain_pred_weight_table(h, 1, 332 &slice_param->luma_weight_l1_flag, slice_param->luma_weight_l1, slice_param->luma_offset_l1, 333 &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1); 334 return 0; 335} 336 337AVHWAccel h264_vaapi_hwaccel = { 338 .name = "h264_vaapi", 339 .type = AVMEDIA_TYPE_VIDEO, 340 .id = CODEC_ID_H264, 341 .pix_fmt = PIX_FMT_VAAPI_VLD, 342 .capabilities = 0, 343 .start_frame = start_frame, 344 .end_frame = end_frame, 345 .decode_slice = decode_slice, 346 .priv_data_size = 0, 347}; 348