FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
hevc_refs.c
Go to the documentation of this file.
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  int x_cb = x0 >> s->sps->log2_ctb_size;
55  int y_cb = y0 >> s->sps->log2_ctb_size;
56  int pic_width_cb = s->sps->ctb_width;
57  int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
58  return (RefPicList *)ref->rpl_tab[ctb_addr_ts];
59 }
60 
62 {
63  int i;
64  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
65  ff_hevc_unref_frame(s, &s->DPB[i],
68 }
69 
71 {
72  int i;
73  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
74  ff_hevc_unref_frame(s, &s->DPB[i], ~0);
75 }
76 
78 {
79  int i, j, ret;
80  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
81  HEVCFrame *frame = &s->DPB[i];
82  if (frame->frame->buf[0])
83  continue;
84 
85  ret = ff_thread_get_buffer(s->avctx, &frame->tf,
87  if (ret < 0)
88  return NULL;
89 
90  frame->rpl_buf = av_buffer_allocz(s->nb_nals * sizeof(RefPicListTab));
91  if (!frame->rpl_buf)
92  goto fail;
93 
95  if (!frame->tab_mvf_buf)
96  goto fail;
97  frame->tab_mvf = (MvField *)frame->tab_mvf_buf->data;
98 
100  if (!frame->rpl_tab_buf)
101  goto fail;
102  frame->rpl_tab = (RefPicListTab **)frame->rpl_tab_buf->data;
103  frame->ctb_count = s->sps->ctb_width * s->sps->ctb_height;
104  for (j = 0; j < frame->ctb_count; j++)
105  frame->rpl_tab[j] = (RefPicListTab *)frame->rpl_buf->data;
106 
109  return frame;
110 fail:
111  ff_hevc_unref_frame(s, frame, ~0);
112  return NULL;
113  }
114  av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
115  return NULL;
116 }
117 
119 {
120  HEVCFrame *ref;
121  int i;
122 
123  /* check that this POC doesn't already exist */
124  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
125  HEVCFrame *frame = &s->DPB[i];
126 
127  if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
128  frame->poc == poc) {
129  av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n",
130  poc);
131  return AVERROR_INVALIDDATA;
132  }
133  }
134 
135  ref = alloc_frame(s);
136  if (!ref)
137  return AVERROR(ENOMEM);
138 
139  *frame = ref->frame;
140  s->ref = ref;
141 
142  if (s->sh.pic_output_flag)
144  else
146 
147  ref->poc = poc;
148  ref->sequence = s->seq_decode;
149  ref->window = s->sps->output_window;
150 
151  return 0;
152 }
153 
155 {
156  do {
157  int nb_output = 0;
158  int min_poc = INT_MAX;
159  int i, min_idx, ret;
160 
161  if (s->sh.no_output_of_prior_pics_flag == 1) {
162  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
163  HEVCFrame *frame = &s->DPB[i];
164  if (!(frame->flags & HEVC_FRAME_FLAG_BUMPING) && frame->poc != s->poc &&
165  frame->sequence == s->seq_output) {
167  }
168  }
169  }
170 
171  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
172  HEVCFrame *frame = &s->DPB[i];
173  if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
174  frame->sequence == s->seq_output) {
175  nb_output++;
176  if (frame->poc < min_poc || nb_output == 1) {
177  min_poc = frame->poc;
178  min_idx = i;
179  }
180  }
181  }
182 
183  /* wait for more frames before output */
184  if (!flush && s->seq_output == s->seq_decode && s->sps &&
185  nb_output <= s->sps->temporal_layer[s->sps->max_sub_layers - 1].num_reorder_pics)
186  return 0;
187 
188  if (nb_output) {
189  HEVCFrame *frame = &s->DPB[min_idx];
190  AVFrame *dst = out;
191  AVFrame *src = frame->frame;
192  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
193  int pixel_shift = !!(desc->comp[0].depth_minus1 > 7);
194 
195  ret = av_frame_ref(out, src);
196  if (frame->flags & HEVC_FRAME_FLAG_BUMPING)
198  else
200  if (ret < 0)
201  return ret;
202 
203  for (i = 0; i < 3; i++) {
204  int hshift = (i > 0) ? desc->log2_chroma_w : 0;
205  int vshift = (i > 0) ? desc->log2_chroma_h : 0;
206  int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
207  (frame->window.top_offset >> vshift) * dst->linesize[i];
208  dst->data[i] += off;
209  }
211  "Output frame with POC %d.\n", frame->poc);
212  return 1;
213  }
214 
215  if (s->seq_output != s->seq_decode)
216  s->seq_output = (s->seq_output + 1) & 0xff;
217  else
218  break;
219  } while (1);
220 
221  return 0;
222 }
223 
225 {
226  int dpb = 0;
227  int min_poc = INT_MAX;
228  int i;
229 
230  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
231  HEVCFrame *frame = &s->DPB[i];
232  if ((frame->flags) &&
233  frame->sequence == s->seq_output &&
234  frame->poc != s->poc) {
235  dpb++;
236  }
237  }
238 
239  if (s->sps && dpb >= s->sps->temporal_layer[s->sps->max_sub_layers - 1].max_dec_pic_buffering) {
240  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
241  HEVCFrame *frame = &s->DPB[i];
242  if ((frame->flags) &&
243  frame->sequence == s->seq_output &&
244  frame->poc != s->poc) {
245  if (frame->flags == HEVC_FRAME_FLAG_OUTPUT && frame->poc < min_poc) {
246  min_poc = frame->poc;
247  }
248  }
249  }
250 
251  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
252  HEVCFrame *frame = &s->DPB[i];
253  if (frame->flags & HEVC_FRAME_FLAG_OUTPUT &&
254  frame->sequence == s->seq_output &&
255  frame->poc <= min_poc) {
256  frame->flags |= HEVC_FRAME_FLAG_BUMPING;
257  }
258  }
259 
260  dpb--;
261  }
262 }
263 
265 {
266  HEVCFrame *frame = s->ref;
267  int ctb_count = frame->ctb_count;
268  int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
269  int i;
270 
271  if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
272  return AVERROR_INVALIDDATA;
273 
274  for (i = ctb_addr_ts; i < ctb_count; i++)
275  frame->rpl_tab[i] = (RefPicListTab *)frame->rpl_buf->data + s->slice_idx;
276 
277  frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts];
278 
279  return 0;
280 }
281 
283 {
284  SliceHeader *sh = &s->sh;
285 
286  uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;
287  uint8_t list_idx;
288  int i, j, ret;
289 
290  ret = init_slice_rpl(s);
291  if (ret < 0)
292  return ret;
293 
294  if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
295  s->rps[LT_CURR].nb_refs)) {
296  av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
297  return AVERROR_INVALIDDATA;
298  }
299 
300  for (list_idx = 0; list_idx < nb_list; list_idx++) {
301  RefPicList rpl_tmp = { { 0 } };
302  RefPicList *rpl = &s->ref->refPicList[list_idx];
303 
304  /* The order of the elements is
305  * ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
306  * ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1 */
307  int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
308  list_idx ? ST_CURR_BEF : ST_CURR_AFT,
309  LT_CURR };
310 
311  /* concatenate the candidate lists for the current frame */
312  while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
313  for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
314  RefPicList *rps = &s->rps[cand_lists[i]];
315  for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < MAX_REFS; j++) {
316  rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
317  rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
318  rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = i == 2;
319  rpl_tmp.nb_refs++;
320  }
321  }
322  }
323 
324  /* reorder the references if necessary */
325  if (sh->rpl_modification_flag[list_idx]) {
326  for (i = 0; i < sh->nb_refs[list_idx]; i++) {
327  int idx = sh->list_entry_lx[list_idx][i];
328 
329  if (idx >= rpl_tmp.nb_refs) {
330  av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
331  return AVERROR_INVALIDDATA;
332  }
333 
334  rpl->list[i] = rpl_tmp.list[idx];
335  rpl->ref[i] = rpl_tmp.ref[idx];
336  rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
337  rpl->nb_refs++;
338  }
339  } else {
340  memcpy(rpl, &rpl_tmp, sizeof(*rpl));
341  rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
342  }
343 
344  if (sh->collocated_list == list_idx &&
345  sh->collocated_ref_idx < rpl->nb_refs)
346  s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
347  }
348 
349  return 0;
350 }
351 
353 {
354  int i;
355  int LtMask = (1 << s->sps->log2_max_poc_lsb) - 1;
356 
357  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
358  HEVCFrame *ref = &s->DPB[i];
359  if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
360  if ((ref->poc & LtMask) == poc)
361  return ref;
362  }
363  }
364 
365  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
366  HEVCFrame *ref = &s->DPB[i];
367  if (ref->frame->buf[0] && ref->sequence == s->seq_decode) {
368  if (ref->poc == poc || (ref->poc & LtMask) == poc)
369  return ref;
370  }
371  }
372 
374  "Could not find ref with POC %d\n", poc);
375  return NULL;
376 }
377 
378 static void mark_ref(HEVCFrame *frame, int flag)
379 {
381  frame->flags |= flag;
382 }
383 
385 {
386  HEVCFrame *frame;
387  int i, x, y;
388 
389  frame = alloc_frame(s);
390  if (!frame)
391  return NULL;
392 
393  if (!s->sps->pixel_shift) {
394  for (i = 0; frame->frame->buf[i]; i++)
395  memset(frame->frame->buf[i]->data, 1 << (s->sps->bit_depth - 1),
396  frame->frame->buf[i]->size);
397  } else {
398  for (i = 0; frame->frame->data[i]; i++)
399  for (y = 0; y < (s->sps->height >> s->sps->vshift[i]); y++)
400  for (x = 0; x < (s->sps->width >> s->sps->hshift[i]); x++) {
401  AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
402  1 << (s->sps->bit_depth - 1));
403  }
404  }
405 
406  frame->poc = poc;
407  frame->sequence = s->seq_decode;
408  frame->flags = 0;
409 
410  if (s->threads_type == FF_THREAD_FRAME)
411  ff_thread_report_progress(&frame->tf, INT_MAX, 0);
412 
413  return frame;
414 }
415 
416 /* add a reference with the given poc to the list and mark it as used in DPB */
418  int poc, int ref_flag)
419 {
420  HEVCFrame *ref = find_ref_idx(s, poc);
421 
422  if (ref == s->ref)
423  return AVERROR_INVALIDDATA;
424 
425  if (!ref) {
426  ref = generate_missing_ref(s, poc);
427  if (!ref)
428  return AVERROR(ENOMEM);
429  }
430 
431  list->list[list->nb_refs] = ref->poc;
432  list->ref[list->nb_refs] = ref;
433  list->nb_refs++;
434 
435  mark_ref(ref, ref_flag);
436  return 0;
437 }
438 
440 {
441  const ShortTermRPS *short_rps = s->sh.short_term_rps;
442  const LongTermRPS *long_rps = &s->sh.long_term_rps;
443  RefPicList *rps = s->rps;
444  int i, ret;
445 
446  if (!short_rps) {
447  rps[0].nb_refs = rps[1].nb_refs = 0;
448  return 0;
449  }
450 
451  /* clear the reference flags on all frames except the current one */
452  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
453  HEVCFrame *frame = &s->DPB[i];
454 
455  if (frame == s->ref)
456  continue;
457 
458  mark_ref(frame, 0);
459  }
460 
461  for (i = 0; i < NB_RPS_TYPE; i++)
462  rps[i].nb_refs = 0;
463 
464  /* add the short refs */
465  for (i = 0; i < short_rps->num_delta_pocs; i++) {
466  int poc = s->poc + short_rps->delta_poc[i];
467  int list;
468 
469  if (!short_rps->used[i])
470  list = ST_FOLL;
471  else if (i < short_rps->num_negative_pics)
472  list = ST_CURR_BEF;
473  else
474  list = ST_CURR_AFT;
475 
476  ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
477  if (ret < 0)
478  return ret;
479  }
480 
481  /* add the long refs */
482  for (i = 0; i < long_rps->nb_refs; i++) {
483  int poc = long_rps->poc[i];
484  int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
485 
486  ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
487  if (ret < 0)
488  return ret;
489  }
490 
491  /* release any frames that are now unused */
492  for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
493  ff_hevc_unref_frame(s, &s->DPB[i], 0);
494 
495  return 0;
496 }
497 
499 {
500  int max_poc_lsb = 1 << s->sps->log2_max_poc_lsb;
501  int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
502  int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
503  int poc_msb;
504 
505  if (poc_lsb < prev_poc_lsb && prev_poc_lsb - poc_lsb >= max_poc_lsb / 2)
506  poc_msb = prev_poc_msb + max_poc_lsb;
507  else if (poc_lsb > prev_poc_lsb && poc_lsb - prev_poc_lsb > max_poc_lsb / 2)
508  poc_msb = prev_poc_msb - max_poc_lsb;
509  else
510  poc_msb = prev_poc_msb;
511 
512  // For BLA picture types, POCmsb is set to 0.
513  if (s->nal_unit_type == NAL_BLA_W_LP ||
516  poc_msb = 0;
517 
518  return poc_msb + poc_lsb;
519 }
520 
522 {
523  int ret = 0;
524  int i;
525  const ShortTermRPS *rps = s->sh.short_term_rps;
526  LongTermRPS *long_rps = &s->sh.long_term_rps;
527 
528  if (rps) {
529  for (i = 0; i < rps->num_negative_pics; i++)
530  ret += !!rps->used[i];
531  for (; i < rps->num_delta_pocs; i++)
532  ret += !!rps->used[i];
533  }
534 
535  if (long_rps) {
536  for (i = 0; i < long_rps->nb_refs; i++)
537  ret += !!long_rps->used[i];
538  }
539  return ret;
540 }