path: root/libavcodec/hevc_refs.c (plain)
blob: 9103c84686769af54c4685402017c1d6d9747642

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
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
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
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
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
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->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
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
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->window = s->ps.sps->output_window;
167
168	return 0;
169	}
170
171	int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
172	{
173	do {
174	int nb_output = 0;
175	int min_poc = INT_MAX;
176	int i, min_idx, ret;
177
178	if (s->sh.no_output_of_prior_pics_flag == 1 && s->no_rasl_output_flag == 1) {
179	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
180	HEVCFrame *frame = &s->DPB[i];
181	if (!(frame->flags & HEVC_FRAME_FLAG_BUMPING) && frame->poc != s->poc &&
182	frame->sequence == s->seq_output) {
183	ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
184	}
185	}
186	}
187
188	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
189	HEVCFrame *frame = &s->DPB[i];
190	if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
191	frame->sequence == s->seq_output) {
192	nb_output++;
193	if (frame->poc < min_poc || nb_output == 1) {
194	min_poc = frame->poc;
195	min_idx = i;
196	}
197	}
198	}
199
200	/* wait for more frames before output */
201	if (!flush && s->seq_output == s->seq_decode && s->ps.sps &&
202	nb_output <= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].num_reorder_pics)
203	return 0;
204
205	if (nb_output) {
206	HEVCFrame *frame = &s->DPB[min_idx];
207	AVFrame *dst = out;
208	AVFrame *src = frame->frame;
209	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
210	int pixel_shift = !!(desc->comp[0].depth > 8);
211
212	ret = av_frame_ref(out, src);
213	if (frame->flags & HEVC_FRAME_FLAG_BUMPING)
214	ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_BUMPING);
215	else
216	ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
217	if (ret < 0)
218	return ret;
219
220	for (i = 0; i < 3; i++) {
221	int hshift = (i > 0) ? desc->log2_chroma_w : 0;
222	int vshift = (i > 0) ? desc->log2_chroma_h : 0;
223	int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
224	(frame->window.top_offset >> vshift) * dst->linesize[i];
225	dst->data[i] += off;
226	}
227	av_log(s->avctx, AV_LOG_DEBUG,
228	"Output frame with POC %d.\n", frame->poc);
229	return 1;
230	}
231
232	if (s->seq_output != s->seq_decode)
233	s->seq_output = (s->seq_output + 1) & 0xff;
234	else
235	break;
236	} while (1);
237
238	return 0;
239	}
240
241	void ff_hevc_bump_frame(HEVCContext *s)
242	{
243	int dpb = 0;
244	int min_poc = INT_MAX;
245	int i;
246
247	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
248	HEVCFrame *frame = &s->DPB[i];
249	if ((frame->flags) &&
250	frame->sequence == s->seq_output &&
251	frame->poc != s->poc) {
252	dpb++;
253	}
254	}
255
256	if (s->ps.sps && dpb >= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].max_dec_pic_buffering) {
257	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
258	HEVCFrame *frame = &s->DPB[i];
259	if ((frame->flags) &&
260	frame->sequence == s->seq_output &&
261	frame->poc != s->poc) {
262	if (frame->flags == HEVC_FRAME_FLAG_OUTPUT && frame->poc < min_poc) {
263	min_poc = frame->poc;
264	}
265	}
266	}
267
268	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
269	HEVCFrame *frame = &s->DPB[i];
270	if (frame->flags & HEVC_FRAME_FLAG_OUTPUT &&
271	frame->sequence == s->seq_output &&
272	frame->poc <= min_poc) {
273	frame->flags |= HEVC_FRAME_FLAG_BUMPING;
274	}
275	}
276
277	dpb--;
278	}
279	}
280
281	static int init_slice_rpl(HEVCContext *s)
282	{
283	HEVCFrame *frame = s->ref;
284	int ctb_count = frame->ctb_count;
285	int ctb_addr_ts = s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
286	int i;
287
288	if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
289	return AVERROR_INVALIDDATA;
290
291	for (i = ctb_addr_ts; i < ctb_count; i++)
292	frame->rpl_tab[i] = (RefPicListTab *)frame->rpl_buf->data + s->slice_idx;
293
294	frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts];
295
296	return 0;
297	}
298
299	int ff_hevc_slice_rpl(HEVCContext *s)
300	{
301	SliceHeader *sh = &s->sh;
302
303	uint8_t nb_list = sh->slice_type == HEVC_SLICE_B ? 2 : 1;
304	uint8_t list_idx;
305	int i, j, ret;
306
307	ret = init_slice_rpl(s);
308	if (ret < 0)
309	return ret;
310
311	if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
312	s->rps[LT_CURR].nb_refs)) {
313	av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
314	return AVERROR_INVALIDDATA;
315	}
316
317	for (list_idx = 0; list_idx < nb_list; list_idx++) {
318	RefPicList rpl_tmp = { { 0 } };
319	RefPicList *rpl = &s->ref->refPicList[list_idx];
320
321	/* The order of the elements is
322	* ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
323	* ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1 */
324	int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
325	list_idx ? ST_CURR_BEF : ST_CURR_AFT,
326	LT_CURR };
327
328	/* concatenate the candidate lists for the current frame */
329	while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
330	for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
331	RefPicList *rps = &s->rps[cand_lists[i]];
332	for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < HEVC_MAX_REFS; j++) {
333	rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
334	rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
335	rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = i == 2;
336	rpl_tmp.nb_refs++;
337	}
338	}
339	}
340
341	/* reorder the references if necessary */
342	if (sh->rpl_modification_flag[list_idx]) {
343	for (i = 0; i < sh->nb_refs[list_idx]; i++) {
344	int idx = sh->list_entry_lx[list_idx][i];
345
346	if (idx >= rpl_tmp.nb_refs) {
347	av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
348	return AVERROR_INVALIDDATA;
349	}
350
351	rpl->list[i] = rpl_tmp.list[idx];
352	rpl->ref[i] = rpl_tmp.ref[idx];
353	rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
354	rpl->nb_refs++;
355	}
356	} else {
357	memcpy(rpl, &rpl_tmp, sizeof(*rpl));
358	rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
359	}
360
361	if (sh->collocated_list == list_idx &&
362	sh->collocated_ref_idx < rpl->nb_refs)
363	s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
364	}
365
366	return 0;
367	}
368
369	static HEVCFrame *find_ref_idx(HEVCContext *s, int poc)
370	{
371	int i;
372	int LtMask = (1 << s->ps.sps->log2_max_poc_lsb) - 1;
373
374	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
375	HEVCFrame *ref = &s->DPB[i];
376	if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
377	if ((ref->poc & LtMask) == poc)
378	return ref;
379	}
380	}
381
382	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
383	HEVCFrame *ref = &s->DPB[i];
384	if (ref->frame->buf[0] && ref->sequence == s->seq_decode) {
385	if (ref->poc == poc || (ref->poc & LtMask) == poc)
386	return ref;
387	}
388	}
389
390	if (s->nal_unit_type != HEVC_NAL_CRA_NUT && !IS_BLA(s))
391	av_log(s->avctx, AV_LOG_ERROR,
392	"Could not find ref with POC %d\n", poc);
393	return NULL;
394	}
395
396	static void mark_ref(HEVCFrame *frame, int flag)
397	{
398	frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
399	frame->flags |= flag;
400	}
401
402	static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
403	{
404	HEVCFrame *frame;
405	int i, x, y;
406
407	frame = alloc_frame(s);
408	if (!frame)
409	return NULL;
410
411	if (!s->avctx->hwaccel) {
412	if (!s->ps.sps->pixel_shift) {
413	for (i = 0; frame->frame->buf[i]; i++)
414	memset(frame->frame->buf[i]->data, 1 << (s->ps.sps->bit_depth - 1),
415	frame->frame->buf[i]->size);
416	} else {
417	for (i = 0; frame->frame->data[i]; i++)
418	for (y = 0; y < (s->ps.sps->height >> s->ps.sps->vshift[i]); y++)
419	for (x = 0; x < (s->ps.sps->width >> s->ps.sps->hshift[i]); x++) {
420	AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
421	1 << (s->ps.sps->bit_depth - 1));
422	}
423	}
424	}
425
426	frame->poc = poc;
427	frame->sequence = s->seq_decode;
428	frame->flags = 0;
429
430	if (s->threads_type == FF_THREAD_FRAME)
431	ff_thread_report_progress(&frame->tf, INT_MAX, 0);
432
433	return frame;
434	}
435
436	/* add a reference with the given poc to the list and mark it as used in DPB */
437	static int add_candidate_ref(HEVCContext *s, RefPicList *list,
438	int poc, int ref_flag)
439	{
440	HEVCFrame *ref = find_ref_idx(s, poc);
441
442	if (ref == s->ref)
443	return AVERROR_INVALIDDATA;
444
445	if (!ref) {
446	ref = generate_missing_ref(s, poc);
447	if (!ref)
448	return AVERROR(ENOMEM);
449	}
450
451	list->list[list->nb_refs] = ref->poc;
452	list->ref[list->nb_refs] = ref;
453	list->nb_refs++;
454
455	mark_ref(ref, ref_flag);
456	return 0;
457	}
458
459	int ff_hevc_frame_rps(HEVCContext *s)
460	{
461	const ShortTermRPS *short_rps = s->sh.short_term_rps;
462	const LongTermRPS *long_rps = &s->sh.long_term_rps;
463	RefPicList *rps = s->rps;
464	int i, ret = 0;
465
466	if (!short_rps) {
467	rps[0].nb_refs = rps[1].nb_refs = 0;
468	return 0;
469	}
470
471	/* clear the reference flags on all frames except the current one */
472	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
473	HEVCFrame *frame = &s->DPB[i];
474
475	if (frame == s->ref)
476	continue;
477
478	mark_ref(frame, 0);
479	}
480
481	for (i = 0; i < NB_RPS_TYPE; i++)
482	rps[i].nb_refs = 0;
483
484	/* add the short refs */
485	for (i = 0; i < short_rps->num_delta_pocs; i++) {
486	int poc = s->poc + short_rps->delta_poc[i];
487	int list;
488
489	if (!short_rps->used[i])
490	list = ST_FOLL;
491	else if (i < short_rps->num_negative_pics)
492	list = ST_CURR_BEF;
493	else
494	list = ST_CURR_AFT;
495
496	ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
497	if (ret < 0)
498	goto fail;
499	}
500
501	/* add the long refs */
502	for (i = 0; i < long_rps->nb_refs; i++) {
503	int poc = long_rps->poc[i];
504	int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
505
506	ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
507	if (ret < 0)
508	goto fail;
509	}
510
511	fail:
512	/* release any frames that are now unused */
513	for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
514	ff_hevc_unref_frame(s, &s->DPB[i], 0);
515
516	return ret;
517	}
518
519	int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb)
520	{
521	int max_poc_lsb = 1 << s->ps.sps->log2_max_poc_lsb;
522	int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
523	int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
524	int poc_msb;
525
526	if (poc_lsb < prev_poc_lsb && prev_poc_lsb - poc_lsb >= max_poc_lsb / 2)
527	poc_msb = prev_poc_msb + max_poc_lsb;
528	else if (poc_lsb > prev_poc_lsb && poc_lsb - prev_poc_lsb > max_poc_lsb / 2)
529	poc_msb = prev_poc_msb - max_poc_lsb;
530	else
531	poc_msb = prev_poc_msb;
532
533	// For BLA picture types, POCmsb is set to 0.
534	if (s->nal_unit_type == HEVC_NAL_BLA_W_LP ||
535	s->nal_unit_type == HEVC_NAL_BLA_W_RADL ||
536	s->nal_unit_type == HEVC_NAL_BLA_N_LP)
537	poc_msb = 0;
538
539	return poc_msb + poc_lsb;
540	}
541
542	int ff_hevc_frame_nb_refs(HEVCContext *s)
543	{
544	int ret = 0;
545	int i;
546	const ShortTermRPS *rps = s->sh.short_term_rps;
547	LongTermRPS *long_rps = &s->sh.long_term_rps;
548
549	if (rps) {
550	for (i = 0; i < rps->num_negative_pics; i++)
551	ret += !!rps->used[i];
552	for (; i < rps->num_delta_pocs; i++)
553	ret += !!rps->used[i];
554	}
555
556	if (long_rps) {
557	for (i = 0; i < long_rps->nb_refs; i++)
558	ret += !!long_rps->used[i];
559	}
560	return ret;
561	}
562