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hevc_refs.c
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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 
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 
41  frame->tab_mvf = NULL;
42 
43  av_buffer_unref(&frame->rpl_buf);
45  frame->rpl_tab = NULL;
46  frame->refPicList = NULL;
47 
48  frame->collocated_ref = NULL;
49  }
50 }
51 
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 
67 {
68  int i;
69  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
70  ff_hevc_unref_frame(s, &s->DPB[i],
73 }
74 
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 
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,
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 
100  if (!frame->tab_mvf_buf)
101  goto fail;
102  frame->tab_mvf = (MvField *)frame->tab_mvf_buf->data;
103 
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 
114  return frame;
115 fail:
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 
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)
149  else
151 
152  ref->poc = poc;
153  ref->sequence = s->seq_decode;
154  ref->window = s->sps->output_window;
155 
156  return 0;
157 }
158 
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);
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  }
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 
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 
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 
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 
336  "Could not find ref with POC %d\n", poc);
337  return NULL;
338 }
339 
340 static void mark_ref(HEVCFrame *frame, int flag)
341 {
343  frame->flags |= flag;
344 }
345 
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 */
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 
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 
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 ||
478  poc_msb = 0;
479 
480  return poc_msb + poc_lsb;
481 }
482 
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 }