1/* 2 * HEVC video decoder 3 * 4 * Copyright (C) 2012 - 2013 Guillaume Martres 5 * Copyright (C) 2012 - 2013 Gildas Cocherel 6 * 7 * This file is part of FFmpeg. 8 * 9 * FFmpeg is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * FFmpeg is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with FFmpeg; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24#include "libavutil/pixdesc.h" 25 26#include "internal.h" 27#include "thread.h" 28#include "hevc.h" 29 30void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags) 31{ 32 /* frame->frame can be NULL if context init failed */ 33 if (!frame->frame || !frame->frame->buf[0]) 34 return; 35 36 frame->flags &= ~flags; 37 if (!frame->flags) { 38 ff_thread_release_buffer(s->avctx, &frame->tf); 39 40 av_buffer_unref(&frame->tab_mvf_buf); 41 frame->tab_mvf = NULL; 42 43 av_buffer_unref(&frame->rpl_buf); 44 av_buffer_unref(&frame->rpl_tab_buf); 45 frame->rpl_tab = NULL; 46 frame->refPicList = NULL; 47 48 frame->collocated_ref = NULL; 49 } 50} 51 52RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0) 53{ 54 if (x0 < 0 || y0 < 0) { 55 return s->ref->refPicList; 56 } else { 57 int x_cb = x0 >> s->sps->log2_ctb_size; 58 int y_cb = y0 >> s->sps->log2_ctb_size; 59 int pic_width_cb = (s->sps->width + (1 << s->sps->log2_ctb_size) - 1) >> 60 s->sps->log2_ctb_size; 61 int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb]; 62 return (RefPicList *)ref->rpl_tab[ctb_addr_ts]; 63 } 64} 65 66void ff_hevc_clear_refs(HEVCContext *s) 67{ 68 int i; 69 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) 70 ff_hevc_unref_frame(s, &s->DPB[i], 71 HEVC_FRAME_FLAG_SHORT_REF | 72 HEVC_FRAME_FLAG_LONG_REF); 73} 74 75void ff_hevc_flush_dpb(HEVCContext *s) 76{ 77 int i; 78 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) 79 ff_hevc_unref_frame(s, &s->DPB[i], ~0); 80} 81 82static HEVCFrame *alloc_frame(HEVCContext *s) 83{ 84 int i, j, ret; 85 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 86 HEVCFrame *frame = &s->DPB[i]; 87 if (frame->frame->buf[0]) 88 continue; 89 90 ret = ff_thread_get_buffer(s->avctx, &frame->tf, 91 AV_GET_BUFFER_FLAG_REF); 92 if (ret < 0) 93 return NULL; 94 95 frame->rpl_buf = av_buffer_allocz(s->nb_nals * sizeof(RefPicListTab)); 96 if (!frame->rpl_buf) 97 goto fail; 98 99 frame->tab_mvf_buf = av_buffer_pool_get(s->tab_mvf_pool); 100 if (!frame->tab_mvf_buf) 101 goto fail; 102 frame->tab_mvf = (MvField *)frame->tab_mvf_buf->data; 103 104 frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool); 105 if (!frame->rpl_tab_buf) 106 goto fail; 107 frame->rpl_tab = (RefPicListTab **)frame->rpl_tab_buf->data; 108 frame->ctb_count = s->sps->ctb_width * s->sps->ctb_height; 109 for (j = 0; j < frame->ctb_count; j++) 110 frame->rpl_tab[j] = (RefPicListTab *)frame->rpl_buf->data; 111 112 frame->frame->top_field_first = s->picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD; 113 frame->frame->interlaced_frame = (s->picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD) || (s->picture_struct == AV_PICTURE_STRUCTURE_BOTTOM_FIELD); 114 return frame; 115fail: 116 ff_hevc_unref_frame(s, frame, ~0); 117 return NULL; 118 } 119 av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n"); 120 return NULL; 121} 122 123int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc) 124{ 125 HEVCFrame *ref; 126 int i; 127 128 /* check that this POC doesn't already exist */ 129 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 130 HEVCFrame *frame = &s->DPB[i]; 131 132 if (frame->frame->buf[0] && frame->sequence == s->seq_decode && 133 frame->poc == poc) { 134 av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n", 135 poc); 136 return AVERROR_INVALIDDATA; 137 } 138 } 139 140 ref = alloc_frame(s); 141 if (!ref) 142 return AVERROR(ENOMEM); 143 144 *frame = ref->frame; 145 s->ref = ref; 146 147 if (s->sh.pic_output_flag) 148 ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF; 149 else 150 ref->flags = HEVC_FRAME_FLAG_SHORT_REF; 151 152 ref->poc = poc; 153 ref->sequence = s->seq_decode; 154 ref->window = s->sps->output_window; 155 156 return 0; 157} 158 159int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush) 160{ 161 do { 162 int nb_output = 0; 163 int min_poc = INT_MAX; 164 int i, min_idx, ret; 165 166 if (s->sh.no_output_of_prior_pics_flag == 1) { 167 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 168 HEVCFrame *frame = &s->DPB[i]; 169 if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) && frame->poc != s->poc && 170 frame->sequence == s->seq_output) { 171 frame->flags &= ~(HEVC_FRAME_FLAG_OUTPUT); 172 } 173 } 174 } 175 176 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 177 HEVCFrame *frame = &s->DPB[i]; 178 if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) && 179 frame->sequence == s->seq_output) { 180 nb_output++; 181 if (frame->poc < min_poc) { 182 min_poc = frame->poc; 183 min_idx = i; 184 } 185 } 186 } 187 188 /* wait for more frames before output */ 189 if (!flush && s->seq_output == s->seq_decode && s->sps && 190 nb_output <= s->sps->temporal_layer[s->sps->max_sub_layers - 1].num_reorder_pics) 191 return 0; 192 193 if (nb_output) { 194 HEVCFrame *frame = &s->DPB[min_idx]; 195 AVFrame *dst = out; 196 AVFrame *src = frame->frame; 197 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format); 198 int pixel_shift = !!(desc->comp[0].depth_minus1 > 7); 199 200 ret = av_frame_ref(out, src); 201 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT); 202 if (ret < 0) 203 return ret; 204 205 for (i = 0; i < 3; i++) { 206 int hshift = (i > 0) ? desc->log2_chroma_w : 0; 207 int vshift = (i > 0) ? desc->log2_chroma_h : 0; 208 int off = ((frame->window.left_offset >> hshift) << pixel_shift) + 209 (frame->window.top_offset >> vshift) * dst->linesize[i]; 210 dst->data[i] += off; 211 } 212 av_log(s->avctx, AV_LOG_DEBUG, 213 "Output frame with POC %d.\n", frame->poc); 214 return 1; 215 } 216 217 if (s->seq_output != s->seq_decode) 218 s->seq_output = (s->seq_output + 1) & 0xff; 219 else 220 break; 221 } while (1); 222 223 return 0; 224} 225 226static int init_slice_rpl(HEVCContext *s) 227{ 228 HEVCFrame *frame = s->ref; 229 int ctb_count = frame->ctb_count; 230 int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr]; 231 int i; 232 233 if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab)) 234 return AVERROR_INVALIDDATA; 235 236 for (i = ctb_addr_ts; i < ctb_count; i++) 237 frame->rpl_tab[i] = (RefPicListTab *)frame->rpl_buf->data + s->slice_idx; 238 239 frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts]; 240 241 return 0; 242} 243 244int ff_hevc_slice_rpl(HEVCContext *s) 245{ 246 SliceHeader *sh = &s->sh; 247 248 uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1; 249 uint8_t list_idx; 250 int i, j, ret; 251 252 ret = init_slice_rpl(s); 253 if (ret < 0) 254 return ret; 255 256 if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs + 257 s->rps[LT_CURR].nb_refs)) { 258 av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n"); 259 return AVERROR_INVALIDDATA; 260 } 261 262 for (list_idx = 0; list_idx < nb_list; list_idx++) { 263 RefPicList rpl_tmp = { { 0 } }; 264 RefPicList *rpl = &s->ref->refPicList[list_idx]; 265 266 /* The order of the elements is 267 * ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and 268 * ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1 */ 269 int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF, 270 list_idx ? ST_CURR_BEF : ST_CURR_AFT, 271 LT_CURR }; 272 273 /* concatenate the candidate lists for the current frame */ 274 while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) { 275 for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) { 276 RefPicList *rps = &s->rps[cand_lists[i]]; 277 for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < MAX_REFS; j++) { 278 rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j]; 279 rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j]; 280 rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = i == 2; 281 rpl_tmp.nb_refs++; 282 } 283 } 284 } 285 286 /* reorder the references if necessary */ 287 if (sh->rpl_modification_flag[list_idx]) { 288 for (i = 0; i < sh->nb_refs[list_idx]; i++) { 289 int idx = sh->list_entry_lx[list_idx][i]; 290 291 if (idx >= rpl_tmp.nb_refs) { 292 av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n"); 293 return AVERROR_INVALIDDATA; 294 } 295 296 rpl->list[i] = rpl_tmp.list[idx]; 297 rpl->ref[i] = rpl_tmp.ref[idx]; 298 rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx]; 299 rpl->nb_refs++; 300 } 301 } else { 302 memcpy(rpl, &rpl_tmp, sizeof(*rpl)); 303 rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]); 304 } 305 306 if (sh->collocated_list == list_idx && 307 sh->collocated_ref_idx < rpl->nb_refs) 308 s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx]; 309 } 310 311 return 0; 312} 313 314static HEVCFrame *find_ref_idx(HEVCContext *s, int poc) 315{ 316 int i; 317 int LtMask = (1 << s->sps->log2_max_poc_lsb) - 1; 318 319 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 320 HEVCFrame *ref = &s->DPB[i]; 321 if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) { 322 if ((ref->poc & LtMask) == poc) 323 return ref; 324 } 325 } 326 327 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 328 HEVCFrame *ref = &s->DPB[i]; 329 if (ref->frame->buf[0] && ref->sequence == s->seq_decode) { 330 if (ref->poc == poc || (ref->poc & LtMask) == poc) 331 return ref; 332 } 333 } 334 335 av_log(s->avctx, AV_LOG_ERROR, 336 "Could not find ref with POC %d\n", poc); 337 return NULL; 338} 339 340static void mark_ref(HEVCFrame *frame, int flag) 341{ 342 frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF); 343 frame->flags |= flag; 344} 345 346static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc) 347{ 348 HEVCFrame *frame; 349 int i, x, y; 350 351 frame = alloc_frame(s); 352 if (!frame) 353 return NULL; 354 355 if (!s->sps->pixel_shift) { 356 for (i = 0; frame->frame->buf[i]; i++) 357 memset(frame->frame->buf[i]->data, 1 << (s->sps->bit_depth - 1), 358 frame->frame->buf[i]->size); 359 } else { 360 for (i = 0; frame->frame->data[i]; i++) 361 for (y = 0; y < (s->sps->height >> s->sps->vshift[i]); y++) 362 for (x = 0; x < (s->sps->width >> s->sps->hshift[i]); x++) { 363 AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x, 364 1 << (s->sps->bit_depth - 1)); 365 } 366 } 367 368 frame->poc = poc; 369 frame->sequence = s->seq_decode; 370 frame->flags = 0; 371 372 if (s->threads_type == FF_THREAD_FRAME) 373 ff_thread_report_progress(&frame->tf, INT_MAX, 0); 374 375 return frame; 376} 377 378/* add a reference with the given poc to the list and mark it as used in DPB */ 379static int add_candidate_ref(HEVCContext *s, RefPicList *list, 380 int poc, int ref_flag) 381{ 382 HEVCFrame *ref = find_ref_idx(s, poc); 383 384 if (ref == s->ref) 385 return AVERROR_INVALIDDATA; 386 387 if (!ref) { 388 ref = generate_missing_ref(s, poc); 389 if (!ref) 390 return AVERROR(ENOMEM); 391 } 392 393 list->list[list->nb_refs] = ref->poc; 394 list->ref[list->nb_refs] = ref; 395 list->nb_refs++; 396 397 mark_ref(ref, ref_flag); 398 return 0; 399} 400 401int ff_hevc_frame_rps(HEVCContext *s) 402{ 403 const ShortTermRPS *short_rps = s->sh.short_term_rps; 404 const LongTermRPS *long_rps = &s->sh.long_term_rps; 405 RefPicList *rps = s->rps; 406 int i, ret; 407 408 if (!short_rps) { 409 rps[0].nb_refs = rps[1].nb_refs = 0; 410 return 0; 411 } 412 413 /* clear the reference flags on all frames except the current one */ 414 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) { 415 HEVCFrame *frame = &s->DPB[i]; 416 417 if (frame == s->ref) 418 continue; 419 420 mark_ref(frame, 0); 421 } 422 423 for (i = 0; i < NB_RPS_TYPE; i++) 424 rps[i].nb_refs = 0; 425 426 /* add the short refs */ 427 for (i = 0; i < short_rps->num_delta_pocs; i++) { 428 int poc = s->poc + short_rps->delta_poc[i]; 429 int list; 430 431 if (!short_rps->used[i]) 432 list = ST_FOLL; 433 else if (i < short_rps->num_negative_pics) 434 list = ST_CURR_BEF; 435 else 436 list = ST_CURR_AFT; 437 438 ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF); 439 if (ret < 0) 440 return ret; 441 } 442 443 /* add the long refs */ 444 for (i = 0; i < long_rps->nb_refs; i++) { 445 int poc = long_rps->poc[i]; 446 int list = long_rps->used[i] ? LT_CURR : LT_FOLL; 447 448 ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF); 449 if (ret < 0) 450 return ret; 451 } 452 453 /* release any frames that are now unused */ 454 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) 455 ff_hevc_unref_frame(s, &s->DPB[i], 0); 456 457 return 0; 458} 459 460int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb) 461{ 462 int max_poc_lsb = 1 << s->sps->log2_max_poc_lsb; 463 int prev_poc_lsb = s->pocTid0 % max_poc_lsb; 464 int prev_poc_msb = s->pocTid0 - prev_poc_lsb; 465 int poc_msb; 466 467 if (poc_lsb < prev_poc_lsb && prev_poc_lsb - poc_lsb >= max_poc_lsb / 2) 468 poc_msb = prev_poc_msb + max_poc_lsb; 469 else if (poc_lsb > prev_poc_lsb && poc_lsb - prev_poc_lsb > max_poc_lsb / 2) 470 poc_msb = prev_poc_msb - max_poc_lsb; 471 else 472 poc_msb = prev_poc_msb; 473 474 // For BLA picture types, POCmsb is set to 0. 475 if (s->nal_unit_type == NAL_BLA_W_LP || 476 s->nal_unit_type == NAL_BLA_W_RADL || 477 s->nal_unit_type == NAL_BLA_N_LP) 478 poc_msb = 0; 479 480 return poc_msb + poc_lsb; 481} 482 483int ff_hevc_frame_nb_refs(HEVCContext *s) 484{ 485 int ret = 0; 486 int i; 487 const ShortTermRPS *rps = s->sh.short_term_rps; 488 LongTermRPS *long_rps = &s->sh.long_term_rps; 489 490 if (rps) { 491 for (i = 0; i < rps->num_negative_pics; i++) 492 ret += !!rps->used[i]; 493 for (; i < rps->num_delta_pocs; i++) 494 ret += !!rps->used[i]; 495 } 496 497 if (long_rps) { 498 for (i = 0; i < long_rps->nb_refs; i++) 499 ret += !!long_rps->used[i]; 500 } 501 return ret; 502} 503