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/avassert.h"
25 #include "libavutil/pixdesc.h"
26
27 #include "internal.h"
28 #include "thread.h"
29 #include "hevc.h"
30 #include "hevcdec.h"
31
ff_hevc_unref_frame(HEVCContext * s,HEVCFrame * frame,int flags)32 void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
33 {
34 /* frame->frame can be NULL if context init failed */
35 if (!frame->frame || !frame->frame->buf[0])
36 return;
37
38 frame->flags &= ~flags;
39 if (!frame->flags) {
40 ff_thread_release_buffer(s->avctx, &frame->tf);
41
42 av_buffer_unref(&frame->tab_mvf_buf);
43 frame->tab_mvf = NULL;
44
45 av_buffer_unref(&frame->rpl_buf);
46 av_buffer_unref(&frame->rpl_tab_buf);
47 frame->rpl_tab = NULL;
48 frame->refPicList = NULL;
49
50 frame->collocated_ref = NULL;
51
52 av_buffer_unref(&frame->hwaccel_priv_buf);
53 frame->hwaccel_picture_private = NULL;
54 }
55 }
56
ff_hevc_get_ref_list(HEVCContext * s,HEVCFrame * ref,int x0,int y0)57 RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
58 {
59 int x_cb = x0 >> s->ps.sps->log2_ctb_size;
60 int y_cb = y0 >> s->ps.sps->log2_ctb_size;
61 int pic_width_cb = s->ps.sps->ctb_width;
62 int ctb_addr_ts = s->ps.pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
63 return (RefPicList *)ref->rpl_tab[ctb_addr_ts];
64 }
65
ff_hevc_clear_refs(HEVCContext * s)66 void 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
ff_hevc_flush_dpb(HEVCContext * s)75 void 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
alloc_frame(HEVCContext * s)82 static 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->pkt.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->ps.sps->ctb_width * s->ps.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->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD;
113 frame->frame->interlaced_frame = (s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD) || (s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_BOTTOM_FIELD);
114
115 if (s->avctx->hwaccel) {
116 const AVHWAccel *hwaccel = s->avctx->hwaccel;
117 av_assert0(!frame->hwaccel_picture_private);
118 if (hwaccel->frame_priv_data_size) {
119 frame->hwaccel_priv_buf = av_buffer_allocz(hwaccel->frame_priv_data_size);
120 if (!frame->hwaccel_priv_buf)
121 goto fail;
122 frame->hwaccel_picture_private = frame->hwaccel_priv_buf->data;
123 }
124 }
125
126 return frame;
127 fail:
128 ff_hevc_unref_frame(s, frame, ~0);
129 return NULL;
130 }
131 av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
132 return NULL;
133 }
134
ff_hevc_set_new_ref(HEVCContext * s,AVFrame ** frame,int poc)135 int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
136 {
137 HEVCFrame *ref;
138 int i;
139
140 /* check that this POC doesn't already exist */
141 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
142 HEVCFrame *frame = &s->DPB[i];
143
144 if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
145 frame->poc == poc) {
146 av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n",
147 poc);
148 return AVERROR_INVALIDDATA;
149 }
150 }
151
152 ref = alloc_frame(s);
153 if (!ref)
154 return AVERROR(ENOMEM);
155
156 *frame = ref->frame;
157 s->ref = ref;
158
159 if (s->sh.pic_output_flag)
160 ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
161 else
162 ref->flags = HEVC_FRAME_FLAG_SHORT_REF;
163
164 ref->poc = poc;
165 ref->sequence = s->seq_decode;
166 ref->frame->crop_left = s->ps.sps->output_window.left_offset;
167 ref->frame->crop_right = s->ps.sps->output_window.right_offset;
168 ref->frame->crop_top = s->ps.sps->output_window.top_offset;
169 ref->frame->crop_bottom = s->ps.sps->output_window.bottom_offset;
170
171 return 0;
172 }
173
ff_hevc_output_frame(HEVCContext * s,AVFrame * out,int flush)174 int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
175 {
176 do {
177 int nb_output = 0;
178 int min_poc = INT_MAX;
179 int i, min_idx, ret;
180
181 if (s->sh.no_output_of_prior_pics_flag == 1 && s->no_rasl_output_flag == 1) {
182 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
183 HEVCFrame *frame = &s->DPB[i];
184 if (!(frame->flags & HEVC_FRAME_FLAG_BUMPING) && frame->poc != s->poc &&
185 frame->sequence == s->seq_output) {
186 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
187 }
188 }
189 }
190
191 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
192 HEVCFrame *frame = &s->DPB[i];
193 if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
194 frame->sequence == s->seq_output) {
195 nb_output++;
196 if (frame->poc < min_poc || nb_output == 1) {
197 min_poc = frame->poc;
198 min_idx = i;
199 }
200 }
201 }
202
203 /* wait for more frames before output */
204 if (!flush && s->seq_output == s->seq_decode && s->ps.sps &&
205 nb_output <= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].num_reorder_pics)
206 return 0;
207
208 if (nb_output) {
209 HEVCFrame *frame = &s->DPB[min_idx];
210
211 ret = av_frame_ref(out, frame->frame);
212 if (frame->flags & HEVC_FRAME_FLAG_BUMPING)
213 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_BUMPING);
214 else
215 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
216 if (ret < 0)
217 return ret;
218
219 av_log(s->avctx, AV_LOG_DEBUG,
220 "Output frame with POC %d.\n", frame->poc);
221 return 1;
222 }
223
224 if (s->seq_output != s->seq_decode)
225 s->seq_output = (s->seq_output + 1) & 0xff;
226 else
227 break;
228 } while (1);
229
230 return 0;
231 }
232
ff_hevc_bump_frame(HEVCContext * s)233 void ff_hevc_bump_frame(HEVCContext *s)
234 {
235 int dpb = 0;
236 int min_poc = INT_MAX;
237 int i;
238
239 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
240 HEVCFrame *frame = &s->DPB[i];
241 if ((frame->flags) &&
242 frame->sequence == s->seq_output &&
243 frame->poc != s->poc) {
244 dpb++;
245 }
246 }
247
248 if (s->ps.sps && dpb >= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].max_dec_pic_buffering) {
249 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
250 HEVCFrame *frame = &s->DPB[i];
251 if ((frame->flags) &&
252 frame->sequence == s->seq_output &&
253 frame->poc != s->poc) {
254 if (frame->flags == HEVC_FRAME_FLAG_OUTPUT && frame->poc < min_poc) {
255 min_poc = frame->poc;
256 }
257 }
258 }
259
260 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
261 HEVCFrame *frame = &s->DPB[i];
262 if (frame->flags & HEVC_FRAME_FLAG_OUTPUT &&
263 frame->sequence == s->seq_output &&
264 frame->poc <= min_poc) {
265 frame->flags |= HEVC_FRAME_FLAG_BUMPING;
266 }
267 }
268
269 dpb--;
270 }
271 }
272
init_slice_rpl(HEVCContext * s)273 static int init_slice_rpl(HEVCContext *s)
274 {
275 HEVCFrame *frame = s->ref;
276 int ctb_count = frame->ctb_count;
277 int ctb_addr_ts = s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
278 int i;
279
280 if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
281 return AVERROR_INVALIDDATA;
282
283 for (i = ctb_addr_ts; i < ctb_count; i++)
284 frame->rpl_tab[i] = (RefPicListTab *)frame->rpl_buf->data + s->slice_idx;
285
286 frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts];
287
288 return 0;
289 }
290
ff_hevc_slice_rpl(HEVCContext * s)291 int ff_hevc_slice_rpl(HEVCContext *s)
292 {
293 SliceHeader *sh = &s->sh;
294
295 uint8_t nb_list = sh->slice_type == HEVC_SLICE_B ? 2 : 1;
296 uint8_t list_idx;
297 int i, j, ret;
298
299 ret = init_slice_rpl(s);
300 if (ret < 0)
301 return ret;
302
303 if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
304 s->rps[LT_CURR].nb_refs)) {
305 av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
306 return AVERROR_INVALIDDATA;
307 }
308
309 for (list_idx = 0; list_idx < nb_list; list_idx++) {
310 RefPicList rpl_tmp = { { 0 } };
311 RefPicList *rpl = &s->ref->refPicList[list_idx];
312
313 /* The order of the elements is
314 * ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
315 * ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1 */
316 int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
317 list_idx ? ST_CURR_BEF : ST_CURR_AFT,
318 LT_CURR };
319
320 /* concatenate the candidate lists for the current frame */
321 while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
322 for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
323 RefPicList *rps = &s->rps[cand_lists[i]];
324 for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < HEVC_MAX_REFS; j++) {
325 rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
326 rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
327 rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = i == 2;
328 rpl_tmp.nb_refs++;
329 }
330 }
331 }
332
333 /* reorder the references if necessary */
334 if (sh->rpl_modification_flag[list_idx]) {
335 for (i = 0; i < sh->nb_refs[list_idx]; i++) {
336 int idx = sh->list_entry_lx[list_idx][i];
337
338 if (idx >= rpl_tmp.nb_refs) {
339 av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
340 return AVERROR_INVALIDDATA;
341 }
342
343 rpl->list[i] = rpl_tmp.list[idx];
344 rpl->ref[i] = rpl_tmp.ref[idx];
345 rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
346 rpl->nb_refs++;
347 }
348 } else {
349 memcpy(rpl, &rpl_tmp, sizeof(*rpl));
350 rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
351 }
352
353 if (sh->collocated_list == list_idx &&
354 sh->collocated_ref_idx < rpl->nb_refs)
355 s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
356 }
357
358 return 0;
359 }
360
find_ref_idx(HEVCContext * s,int poc,uint8_t use_msb)361 static HEVCFrame *find_ref_idx(HEVCContext *s, int poc, uint8_t use_msb)
362 {
363 int mask = use_msb ? ~0 : (1 << s->ps.sps->log2_max_poc_lsb) - 1;
364 int i;
365
366 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
367 HEVCFrame *ref = &s->DPB[i];
368 if (ref->frame->buf[0] && ref->sequence == s->seq_decode) {
369 if ((ref->poc & mask) == poc)
370 return ref;
371 }
372 }
373
374 if (s->nal_unit_type != HEVC_NAL_CRA_NUT && !IS_BLA(s))
375 av_log(s->avctx, AV_LOG_ERROR,
376 "Could not find ref with POC %d\n", poc);
377 return NULL;
378 }
379
mark_ref(HEVCFrame * frame,int flag)380 static void mark_ref(HEVCFrame *frame, int flag)
381 {
382 frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
383 frame->flags |= flag;
384 }
385
generate_missing_ref(HEVCContext * s,int poc)386 static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
387 {
388 HEVCFrame *frame;
389 int i, y;
390
391 frame = alloc_frame(s);
392 if (!frame)
393 return NULL;
394
395 if (!s->avctx->hwaccel) {
396 if (!s->ps.sps->pixel_shift) {
397 for (i = 0; frame->frame->buf[i]; i++)
398 memset(frame->frame->buf[i]->data, 1 << (s->ps.sps->bit_depth - 1),
399 frame->frame->buf[i]->size);
400 } else {
401 for (i = 0; frame->frame->data[i]; i++)
402 for (y = 0; y < (s->ps.sps->height >> s->ps.sps->vshift[i]); y++) {
403 uint8_t *dst = frame->frame->data[i] + y * frame->frame->linesize[i];
404 AV_WN16(dst, 1 << (s->ps.sps->bit_depth - 1));
405 av_memcpy_backptr(dst + 2, 2, 2*(s->ps.sps->width >> s->ps.sps->hshift[i]) - 2);
406 }
407 }
408 }
409
410 frame->poc = poc;
411 frame->sequence = s->seq_decode;
412 frame->flags = 0;
413
414 if (s->threads_type == FF_THREAD_FRAME)
415 ff_thread_report_progress(&frame->tf, INT_MAX, 0);
416
417 return frame;
418 }
419
420 /* add a reference with the given poc to the list and mark it as used in DPB */
add_candidate_ref(HEVCContext * s,RefPicList * list,int poc,int ref_flag,uint8_t use_msb)421 static int add_candidate_ref(HEVCContext *s, RefPicList *list,
422 int poc, int ref_flag, uint8_t use_msb)
423 {
424 HEVCFrame *ref = find_ref_idx(s, poc, use_msb);
425
426 if (ref == s->ref || list->nb_refs >= HEVC_MAX_REFS)
427 return AVERROR_INVALIDDATA;
428
429 if (!ref) {
430 ref = generate_missing_ref(s, poc);
431 if (!ref)
432 return AVERROR(ENOMEM);
433 }
434
435 list->list[list->nb_refs] = ref->poc;
436 list->ref[list->nb_refs] = ref;
437 list->nb_refs++;
438
439 mark_ref(ref, ref_flag);
440 return 0;
441 }
442
ff_hevc_frame_rps(HEVCContext * s)443 int ff_hevc_frame_rps(HEVCContext *s)
444 {
445 const ShortTermRPS *short_rps = s->sh.short_term_rps;
446 const LongTermRPS *long_rps = &s->sh.long_term_rps;
447 RefPicList *rps = s->rps;
448 int i, ret = 0;
449
450 if (!short_rps) {
451 rps[0].nb_refs = rps[1].nb_refs = 0;
452 return 0;
453 }
454
455 /* clear the reference flags on all frames except the current one */
456 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
457 HEVCFrame *frame = &s->DPB[i];
458
459 if (frame == s->ref)
460 continue;
461
462 mark_ref(frame, 0);
463 }
464
465 for (i = 0; i < NB_RPS_TYPE; i++)
466 rps[i].nb_refs = 0;
467
468 /* add the short refs */
469 for (i = 0; i < short_rps->num_delta_pocs; i++) {
470 int poc = s->poc + short_rps->delta_poc[i];
471 int list;
472
473 if (!short_rps->used[i])
474 list = ST_FOLL;
475 else if (i < short_rps->num_negative_pics)
476 list = ST_CURR_BEF;
477 else
478 list = ST_CURR_AFT;
479
480 ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF, 1);
481 if (ret < 0)
482 goto fail;
483 }
484
485 /* add the long refs */
486 for (i = 0; i < long_rps->nb_refs; i++) {
487 int poc = long_rps->poc[i];
488 int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
489
490 ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF, long_rps->poc_msb_present[i]);
491 if (ret < 0)
492 goto fail;
493 }
494
495 fail:
496 /* release any frames that are now unused */
497 for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
498 ff_hevc_unref_frame(s, &s->DPB[i], 0);
499
500 return ret;
501 }
502
ff_hevc_frame_nb_refs(const HEVCContext * s)503 int ff_hevc_frame_nb_refs(const HEVCContext *s)
504 {
505 int ret = 0;
506 int i;
507 const ShortTermRPS *rps = s->sh.short_term_rps;
508 const LongTermRPS *long_rps = &s->sh.long_term_rps;
509
510 if (rps) {
511 for (i = 0; i < rps->num_negative_pics; i++)
512 ret += !!rps->used[i];
513 for (; i < rps->num_delta_pocs; i++)
514 ret += !!rps->used[i];
515 }
516
517 if (long_rps) {
518 for (i = 0; i < long_rps->nb_refs; i++)
519 ret += !!long_rps->used[i];
520 }
521 return ret;
522 }
523