FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 414 476 87.0%
Branches: 305 396 77.0%

Line Branch Exec Source
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 / AVC / MPEG-4 part10 reference picture handling.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include <inttypes.h>
29
30 #include "libavutil/avassert.h"
31 #include "avcodec.h"
32 #include "h264.h"
33 #include "h264dec.h"
34 #include "golomb.h"
35 #include "mpegutils.h"
36
37 #include <assert.h>
38
39 59553 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41 int i;
42
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238212 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
43
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178659 if (parity == PICT_BOTTOM_FIELD)
44 85584 pic->data[i] += pic->linesize[i];
45 178659 pic->reference = parity;
46 178659 pic->linesize[i] *= 2;
47 }
48 59553 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
49 59553 }
50
51 199427 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
52 {
53 199427 memcpy(dst->data, src->f->data, sizeof(dst->data));
54 199427 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
55 199427 dst->reference = src->reference;
56 199427 dst->poc = src->poc;
57 199427 dst->pic_id = src->pic_id;
58 199427 dst->parent = src;
59 199427 }
60
61 187303 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
62 {
63 187303 int match = !!(src->reference & parity);
64
65
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187303 if (match) {
66 187303 ref_from_h264pic(dest, src);
67
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187303 if (parity != PICT_FRAME) {
68 58524 pic_as_field(dest, parity);
69 58524 dest->pic_id *= 2;
70 58524 dest->pic_id += id_add;
71 }
72 }
73
74 187303 return match;
75 }
76
77 92866 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture * const *in, int len, int is_long, int sel)
79 {
80 92866 int i[2] = { 0 };
81 92866 int index = 0;
82
83
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298513 while (i[0] < len || i[1] < len) {
84
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948811 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 743164 i[0]++;
86
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1075452 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 869805 i[1]++;
88
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205647 if (i[0] < len) {
89
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156972 av_assert0(index < def_len);
90
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156972 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 156972 split_field_copy(&def[index++], in[i[0]++], sel, 1);
92 }
93
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205647 if (i[1] < len) {
94
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30331 av_assert0(index < def_len);
95
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30331 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 30331 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 }
98 }
99
100 92866 return index;
101 }
102
103 48128 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
104 int len, int limit, int dir)
105 {
106 int i, best_poc;
107 48128 int out_i = 0;
108
109 for (;;) {
110
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122172 best_poc = dir ? INT_MIN : INT_MAX;
111
112
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626716 for (i = 0; i < len; i++) {
113 504544 const int poc = src[i]->poc;
114
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504544 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
115 86132 best_poc = poc;
116 86132 sorted[out_i] = src[i];
117 }
118 }
119
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122172 if (best_poc == (dir ? INT_MIN : INT_MAX))
120 48128 break;
121 74044 limit = sorted[out_i++]->poc - dir;
122 }
123 48128 return out_i;
124 }
125
126 145144 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
127 {
128 145144 const AVFrame *f = pic->f;
129 290288 return (h->cur_pic_ptr->f->width != f->width ||
130
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290288 h->cur_pic_ptr->f->height != f->height ||
131
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145144 h->cur_pic_ptr->f->format != f->format);
132 }
133
134 34401 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
135 {
136 int i, len;
137 int j;
138
139
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34401 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
140 H264Picture *sorted[32];
141 int cur_poc, list;
142 int lens[2];
143
144
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12032 if (FIELD_PICTURE(h))
145 4579 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
146 else
147 7453 cur_poc = h->cur_pic_ptr->poc;
148
149
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36096 for (list = 0; list < 2; list++) {
150 24064 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
151 24064 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
152
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24064 av_assert0(len <= 32);
153
154 24064 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
155 sorted, len, 0, h->picture_structure);
156 48128 len += build_def_list(sl->ref_list[list] + len,
157 24064 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
158 24064 h->long_ref, 16, 1, h->picture_structure);
159
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24064 av_assert0(len <= 32);
160
161
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24064 if (len < sl->ref_count[list])
162 4 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
163 24064 lens[list] = len;
164 }
165
166
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12032 if (lens[0] == lens[1] && lens[1] > 1) {
167
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14476 for (i = 0; i < lens[0] &&
168 12550 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
169
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12550 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
170
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10513 if (i == lens[0]) {
171 1926 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
172 }
173 }
174 } else {
175 22369 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
176 22369 h->short_ref, h->short_ref_count, 0, h->picture_structure);
177 44738 len += build_def_list(sl->ref_list[0] + len,
178 22369 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
179 22369 h-> long_ref, 16, 1, h->picture_structure);
180
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22369 av_assert0(len <= 32);
181
182
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22369 if (len < sl->ref_count[0])
183 904 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
184 }
185 #ifdef TRACE
186 for (i = 0; i < sl->ref_count[0]; i++) {
187 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
188 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
189 sl->ref_list[0][i].pic_id,
190 sl->ref_list[0][i].data[0]);
191 }
192 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
193 for (i = 0; i < sl->ref_count[1]; i++) {
194 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
195 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
196 sl->ref_list[1][i].pic_id,
197 sl->ref_list[1][i].data[0]);
198 }
199 }
200 #endif
201
202
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80834 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
203
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181052 for (i = 0; i < sl->ref_count[j]; i++) {
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134619 if (sl->ref_list[j][i].parent) {
205
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133020 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
206 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
207 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
208 }
209 }
210 }
211 }
212
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76594 for (i = 0; i < sl->list_count; i++)
213 42193 h->default_ref[i] = sl->ref_list[i][0];
214 34401 }
215
216 /**
217 * print short term list
218 */
219 52204 static void print_short_term(const H264Context *h)
220 {
221 uint32_t i;
222
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52204 if (h->avctx->debug & FF_DEBUG_MMCO) {
223 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
224 for (i = 0; i < h->short_ref_count; i++) {
225 H264Picture *pic = h->short_ref[i];
226 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
227 i, pic->frame_num, pic->poc, pic->f->data[0]);
228 }
229 }
230 52204 }
231
232 /**
233 * print long term list
234 */
235 52204 static void print_long_term(const H264Context *h)
236 {
237 uint32_t i;
238
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52204 if (h->avctx->debug & FF_DEBUG_MMCO) {
239 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
240 for (i = 0; i < 16; i++) {
241 H264Picture *pic = h->long_ref[i];
242 if (pic) {
243 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
244 i, pic->frame_num, pic->poc, pic->f->data[0]);
245 }
246 }
247 }
248 52204 }
249
250 /**
251 * Extract structure information about the picture described by pic_num in
252 * the current decoding context (frame or field). Note that pic_num is
253 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
254 * @param pic_num picture number for which to extract structure information
255 * @param structure one of PICT_XXX describing structure of picture
256 * with pic_num
257 * @return frame number (short term) or long term index of picture
258 * described by pic_num
259 */
260 27281 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
261 {
262 27281 *structure = h->picture_structure;
263
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27281 if (FIELD_PICTURE(h)) {
264
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3427 if (!(pic_num & 1))
265 /* opposite field */
266 1803 *structure ^= PICT_FRAME;
267 3427 pic_num >>= 1;
268 }
269
270 27281 return pic_num;
271 }
272
273 4768 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
274 {
275 int list, i, j;
276
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11116 for (list = 0; list < sl->list_count; list++) {
277
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22017 for (i = 0; i < sl->ref_count[list]; i++) {
278 15669 H264Ref *frame = &sl->ref_list[list][i];
279 15669 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
280
281 15669 field[0] = *frame;
282
283
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62676 for (j = 0; j < 3; j++)
284 47007 field[0].linesize[j] <<= 1;
285 15669 field[0].reference = PICT_TOP_FIELD;
286 15669 field[0].poc = field[0].parent->field_poc[0];
287
288 15669 field[1] = field[0];
289
290
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62676 for (j = 0; j < 3; j++)
291 47007 field[1].data[j] += frame->parent->f->linesize[j];
292 15669 field[1].reference = PICT_BOTTOM_FIELD;
293 15669 field[1].poc = field[1].parent->field_poc[1];
294 }
295 }
296 4768 }
297
298 34401 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
299 {
300 int list, index, pic_structure;
301
302 34401 print_short_term(h);
303 34401 print_long_term(h);
304
305 34401 h264_initialise_ref_list(h, sl);
306
307
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76594 for (list = 0; list < sl->list_count; list++) {
308 42193 int pred = sl->curr_pic_num;
309
310
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54317 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
311 12124 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
312 12124 unsigned int val = sl->ref_modifications[list][index].val;
313 unsigned int pic_id;
314 int i;
315 12124 H264Picture *ref = NULL;
316
317
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12124 switch (modification_of_pic_nums_idc) {
318 11561 case 0:
319 case 1: {
320 11561 const unsigned int abs_diff_pic_num = val + 1;
321 int frame_num;
322
323
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11561 if (abs_diff_pic_num > sl->max_pic_num) {
324 av_log(h->avctx, AV_LOG_ERROR,
325 "abs_diff_pic_num overflow\n");
326 return AVERROR_INVALIDDATA;
327 }
328
329
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11561 if (modification_of_pic_nums_idc == 0)
330 9421 pred -= abs_diff_pic_num;
331 else
332 2140 pred += abs_diff_pic_num;
333 11561 pred &= sl->max_pic_num - 1;
334
335 11561 frame_num = pic_num_extract(h, pred, &pic_structure);
336
337
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38045 for (i = h->short_ref_count - 1; i >= 0; i--) {
338 38045 ref = h->short_ref[i];
339 assert(ref->reference);
340 assert(!ref->long_ref);
341
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38045 if (ref->frame_num == frame_num &&
342
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11561 (ref->reference & pic_structure))
343 11561 break;
344 }
345
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11561 if (i >= 0)
346 11561 ref->pic_id = pred;
347 11561 break;
348 }
349 563 case 2: {
350 int long_idx;
351 563 pic_id = val; // long_term_pic_idx
352
353 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
354
355
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563 if (long_idx > 31U) {
356 av_log(h->avctx, AV_LOG_ERROR,
357 "long_term_pic_idx overflow\n");
358 return AVERROR_INVALIDDATA;
359 }
360 563 ref = h->long_ref[long_idx];
361 assert(!(ref && !ref->reference));
362
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563 if (ref && (ref->reference & pic_structure)) {
363 563 ref->pic_id = pic_id;
364 assert(ref->long_ref);
365 563 i = 0;
366 } else {
367 i = -1;
368 }
369 563 break;
370 }
371 default:
372 av_assert0(0);
373 }
374
375
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12124 if (i < 0 || mismatches_ref(h, ref)) {
376 av_log(h->avctx, AV_LOG_ERROR,
377 i < 0 ? "reference picture missing during reorder\n" :
378 "mismatching reference\n"
379 );
380 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
381 } else {
382
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23670 for (i = index; i + 1 < sl->ref_count[list]; i++) {
383
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18585 if (sl->ref_list[list][i].parent &&
384
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16904 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
385
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14965 ref->pic_id == sl->ref_list[list][i].pic_id)
386 7039 break;
387 }
388
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23670 for (; i > index; i--) {
389 11546 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
390 }
391 12124 ref_from_h264pic(&sl->ref_list[list][index], ref);
392
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12124 if (FIELD_PICTURE(h)) {
393 1029 pic_as_field(&sl->ref_list[list][index], pic_structure);
394 }
395 }
396 }
397 }
398
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76594 for (list = 0; list < sl->list_count; list++) {
399
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176812 for (index = 0; index < sl->ref_count[list]; index++) {
400
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134619 if ( !sl->ref_list[list][index].parent
401
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134605 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
402 int i;
403 14 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
404
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238 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
405 224 h->last_pocs[i] = INT_MIN;
406
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14 if (h->default_ref[list].parent
407
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14 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
408 14 sl->ref_list[list][index] = h->default_ref[list];
409 else
410 return -1;
411 }
412
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134619 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
413 }
414 }
415
416
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34401 if (FRAME_MBAFF(h))
417 4768 h264_fill_mbaff_ref_list(sl);
418
419 34401 return 0;
420 }
421
422 30241 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
423 {
424 int list, index;
425
426 30241 sl->nb_ref_modifications[0] = 0;
427 30241 sl->nb_ref_modifications[1] = 0;
428
429
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72558 for (list = 0; list < sl->list_count; list++) {
430
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42317 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
431 38901 continue;
432
433 3416 for (index = 0; ; index++) {
434 15612 unsigned int op = get_ue_golomb_31(&sl->gb);
435
436
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15612 if (op == 3)
437 3416 break;
438
439
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12196 if (index >= sl->ref_count[list]) {
440 av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
441 return AVERROR_INVALIDDATA;
442
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12196 } else if (op > 2) {
443 av_log(logctx, AV_LOG_ERROR,
444 "illegal modification_of_pic_nums_idc %u\n",
445 op);
446 return AVERROR_INVALIDDATA;
447 }
448 12196 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
449 12196 sl->ref_modifications[list][index].op = op;
450 12196 sl->nb_ref_modifications[list]++;
451 }
452 }
453
454 30241 return 0;
455 }
456
457 /**
458 * Mark a picture as no longer needed for reference. The refmask
459 * argument allows unreferencing of individual fields or the whole frame.
460 * If the picture becomes entirely unreferenced, but is being held for
461 * display purposes, it is marked as such.
462 * @param refmask mask of fields to unreference; the mask is bitwise
463 * anded with the reference marking of pic
464 * @return non-zero if pic becomes entirely unreferenced (except possibly
465 * for display purposes) zero if one of the fields remains in
466 * reference
467 */
468 17534 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
469 {
470 int i;
471
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17534 if (pic->reference &= refmask) {
472 1167 return 0;
473 } else {
474
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33229 for(i = 0; h->delayed_pic[i]; i++)
475
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18267 if(pic == h->delayed_pic[i]){
476 1405 pic->reference = DELAYED_PIC_REF;
477 1405 break;
478 }
479 16367 return 1;
480 }
481 }
482
483 /**
484 * Find a H264Picture in the short term reference list by frame number.
485 * @param frame_num frame number to search for
486 * @param idx the index into h->short_ref where returned picture is found
487 * undefined if no picture found.
488 * @return pointer to the found picture, or NULL if no pic with the provided
489 * frame number is found
490 */
491 46197 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
492 {
493 int i;
494
495
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202633 for (i = 0; i < h->short_ref_count; i++) {
496 186268 H264Picture *pic = h->short_ref[i];
497
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186268 if (h->avctx->debug & FF_DEBUG_MMCO)
498 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
499
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186268 if (pic->frame_num == frame_num) {
500 29832 *idx = i;
501 29832 return pic;
502 }
503 }
504 16365 return NULL;
505 }
506
507 /**
508 * Remove a picture from the short term reference list by its index in
509 * that list. This does no checking on the provided index; it is assumed
510 * to be valid. Other list entries are shifted down.
511 * @param i index into h->short_ref of picture to remove.
512 */
513 13954 static void remove_short_at_index(H264Context *h, int i)
514 {
515 assert(i >= 0 && i < h->short_ref_count);
516 13954 h->short_ref[i] = NULL;
517
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13954 if (--h->short_ref_count)
518 10548 memmove(&h->short_ref[i], &h->short_ref[i + 1],
519 10548 (h->short_ref_count - i) * sizeof(H264Picture*));
520 13954 }
521
522 /**
523 * @return the removed picture or NULL if an error occurs
524 */
525 31122 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
526 {
527 H264Picture *pic;
528 int i;
529
530
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31122 if (h->avctx->debug & FF_DEBUG_MMCO)
531 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
532
533 31122 pic = find_short(h, frame_num, &i);
534
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31122 if (pic) {
535
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14800 if (unreference_pic(h, pic, ref_mask))
536 13633 remove_short_at_index(h, i);
537 }
538
539 31122 return pic;
540 }
541
542 /**
543 * Remove a picture from the long term reference list by its index in
544 * that list.
545 * @return the removed picture or NULL if an error occurs
546 */
547 41279 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
548 {
549 H264Picture *pic;
550
551 41279 pic = h->long_ref[i];
552
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41279 if (pic) {
553
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342 if (unreference_pic(h, pic, ref_mask)) {
554 assert(h->long_ref[i]->long_ref == 1);
555 342 h->long_ref[i]->long_ref = 0;
556 342 h->long_ref[i] = NULL;
557 342 h->long_ref_count--;
558 }
559 }
560
561 41279 return pic;
562 }
563
564 2159 void ff_h264_remove_all_refs(H264Context *h)
565 {
566 int i;
567
568
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36703 for (i = 0; i < 16; i++) {
569 34544 remove_long(h, i, 0);
570 }
571 assert(h->long_ref_count == 0);
572
573
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2159 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
574 1053 ff_h264_unref_picture(h, &h->last_pic_for_ec);
575 1053 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
576 }
577
578
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4551 for (i = 0; i < h->short_ref_count; i++) {
579 2392 unreference_pic(h, h->short_ref[i], 0);
580 2392 h->short_ref[i] = NULL;
581 }
582 2159 h->short_ref_count = 0;
583
584 2159 memset(h->default_ref, 0, sizeof(h->default_ref));
585 2159 }
586
587 15235 static void generate_sliding_window_mmcos(H264Context *h)
588 {
589 15235 MMCO *mmco = h->mmco;
590 15235 int nb_mmco = 0;
591
592
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15235 if (h->short_ref_count &&
593
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15209 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
594
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12764 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
595 11585 mmco[0].opcode = MMCO_SHORT2UNUSED;
596 11585 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
597 11585 nb_mmco = 1;
598
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11585 if (FIELD_PICTURE(h)) {
599 1044 mmco[0].short_pic_num *= 2;
600 1044 mmco[1].opcode = MMCO_SHORT2UNUSED;
601 1044 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
602 1044 nb_mmco = 2;
603 }
604 }
605
606 15235 h->nb_mmco = nb_mmco;
607 15235 }
608
609 17803 int ff_h264_execute_ref_pic_marking(H264Context *h)
610 {
611 17803 MMCO *mmco = h->mmco;
612 int mmco_count;
613 17803 int i, av_uninit(j);
614 17803 int pps_ref_count[2] = {0};
615 17803 int current_ref_assigned = 0, err = 0;
616 17803 H264Picture *av_uninit(pic);
617
618
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17803 if (!h->ps.sps) {
619 av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
620 err = AVERROR_INVALIDDATA;
621 goto out;
622 }
623
624
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17803 if (!h->explicit_ref_marking)
625 15235 generate_sliding_window_mmcos(h);
626 17803 mmco_count = h->nb_mmco;
627
628
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17803 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
629 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
630
631
2/2
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33403 for (i = 0; i < mmco_count; i++) {
632 15600 int av_uninit(structure), av_uninit(frame_num);
633
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15600 if (h->avctx->debug & FF_DEBUG_MMCO)
634 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
635 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
636
637
2/2
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15600 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
638
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867 mmco[i].opcode == MMCO_SHORT2LONG) {
639 15075 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
640 15075 pic = find_short(h, frame_num, &j);
641
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15075 if (!pic) {
642
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43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
643
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21 !h->long_ref[mmco[i].long_arg] ||
644
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21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
645
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22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
646 22 err = AVERROR_INVALIDDATA;
647 }
648 43 continue;
649 }
650 }
651
652
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15557 switch (mmco[i].opcode) {
653 14711 case MMCO_SHORT2UNUSED:
654
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14711 if (h->avctx->debug & FF_DEBUG_MMCO)
655 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
656 h->mmco[i].short_pic_num, h->short_ref_count);
657 14711 remove_short(h, frame_num, structure ^ PICT_FRAME);
658 14711 break;
659 321 case MMCO_SHORT2LONG:
660
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321 if (h->long_ref[mmco[i].long_arg] != pic)
661 321 remove_long(h, mmco[i].long_arg, 0);
662
663 321 remove_short_at_index(h, j);
664 321 h->long_ref[ mmco[i].long_arg ] = pic;
665
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321 if (h->long_ref[mmco[i].long_arg]) {
666 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
667 321 h->long_ref_count++;
668 }
669 321 break;
670 82 case MMCO_LONG2UNUSED:
671 82 j = pic_num_extract(h, mmco[i].long_arg, &structure);
672 82 pic = h->long_ref[j];
673
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82 if (pic) {
674 82 remove_long(h, j, structure ^ PICT_FRAME);
675 } else if (h->avctx->debug & FF_DEBUG_MMCO)
676 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
677 82 break;
678 21 case MMCO_LONG:
679 // Comment below left from previous code as it is an interesting note.
680 /* First field in pair is in short term list or
681 * at a different long term index.
682 * This is not allowed; see 7.4.3.3, notes 2 and 3.
683 * Report the problem and keep the pair where it is,
684 * and mark this field valid.
685 */
686
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21 if (h->short_ref[0] == h->cur_pic_ptr) {
687 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
688 remove_short_at_index(h, 0);
689 }
690
691 /* make sure the current picture is not already assigned as a long ref */
692
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21 if (h->cur_pic_ptr->long_ref) {
693 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
694 if (h->long_ref[j] == h->cur_pic_ptr) {
695 if (j != mmco[i].long_arg)
696 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
697 remove_long(h, j, 0);
698 }
699 }
700 }
701
702
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21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
703
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21 av_assert0(!h->cur_pic_ptr->long_ref);
704 21 remove_long(h, mmco[i].long_arg, 0);
705
706 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
707 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
708 21 h->long_ref_count++;
709 }
710
711 21 h->cur_pic_ptr->reference |= h->picture_structure;
712 21 current_ref_assigned = 1;
713 21 break;
714 407 case MMCO_SET_MAX_LONG:
715 assert(mmco[i].long_arg <= 16);
716 // just remove the long term which index is greater than new max
717
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6478 for (j = mmco[i].long_arg; j < 16; j++) {
718 6071 remove_long(h, j, 0);
719 }
720 407 break;
721 15 case MMCO_RESET:
722
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68 while (h->short_ref_count) {
723 53 remove_short(h, h->short_ref[0]->frame_num, 0);
724 }
725
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255 for (j = 0; j < 16; j++) {
726 240 remove_long(h, j, 0);
727 }
728 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
729 15 h->mmco_reset = 1;
730 15 h->cur_pic_ptr->mmco_reset = 1;
731
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255 for (j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++)
732 240 h->last_pocs[j] = INT_MIN;
733 15 break;
734 default: av_assert0(0);
735 }
736 }
737
738
2/2
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17803 if (!current_ref_assigned) {
739 /* Second field of complementary field pair; the first field of
740 * which is already referenced. If short referenced, it
741 * should be first entry in short_ref. If not, it must exist
742 * in long_ref; trying to put it on the short list here is an
743 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
744 */
745
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17782 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
746 /* Just mark the second field valid */
747 1460 h->cur_pic_ptr->reference |= h->picture_structure;
748
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16322 } else if (h->cur_pic_ptr->long_ref) {
749 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
750 "assignment for second field "
751 "in complementary field pair "
752 "(first field is long term)\n");
753 err = AVERROR_INVALIDDATA;
754 } else {
755 16322 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
756
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16322 if (pic) {
757 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
758 err = AVERROR_INVALIDDATA;
759 }
760
761
2/2
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16322 if (h->short_ref_count)
762 11871 memmove(&h->short_ref[1], &h->short_ref[0],
763 11871 h->short_ref_count * sizeof(H264Picture*));
764
765 16322 h->short_ref[0] = h->cur_pic_ptr;
766 16322 h->short_ref_count++;
767 16322 h->cur_pic_ptr->reference |= h->picture_structure;
768 }
769 }
770
771
2/2
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17803 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
772
773 /* We have too many reference frames, probably due to corrupted
774 * stream. Need to discard one frame. Prevents overrun of the
775 * short_ref and long_ref buffers.
776 */
777 11 av_log(h->avctx, AV_LOG_ERROR,
778 "number of reference frames (%d+%d) exceeds max (%d; probably "
779 "corrupt input), discarding one\n",
780 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
781 11 err = AVERROR_INVALIDDATA;
782
783
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11 if (h->long_ref_count && !h->short_ref_count) {
784 for (i = 0; i < 16; ++i)
785 if (h->long_ref[i])
786 break;
787
788 assert(i < 16);
789 remove_long(h, i, 0);
790 } else {
791 11 pic = h->short_ref[h->short_ref_count - 1];
792 11 remove_short(h, pic->frame_num, 0);
793 }
794 }
795
796
2/2
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94761 for (i = 0; i<h->short_ref_count; i++) {
797 76958 pic = h->short_ref[i];
798
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✓ Branch 1 taken 76557 times.
76958 if (pic->invalid_gap) {
799 401 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
800
2/2
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401 if (d > h->ps.sps->ref_frame_count)
801 25 remove_short(h, pic->frame_num, 0);
802 }
803 }
804
805 17803 print_short_term(h);
806 17803 print_long_term(h);
807
808
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4575371 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
809
2/2
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4557568 if (h->ps.pps_list[i]) {
810 18035 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data;
811 18035 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
812 18035 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
813 }
814 }
815
816 // Detect unmarked random access points
817
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17803 if ( err >= 0
818
2/2
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17792 && h->long_ref_count==0
819
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16747 && ( h->short_ref_count<=2
820
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9749 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
821
5/6
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8874 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
822
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8578 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
823
2/2
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7400 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
824 2223 h->cur_pic_ptr->recovered |= 1;
825
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2223 if(!h->avctx->has_b_frames)
826 1519 h->frame_recovered |= FRAME_RECOVERED_SEI;
827 }
828
829 16284 out:
830
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17803 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
831 }
832
833 23037 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
834 const H2645NAL *nal, void *logctx)
835 {
836 int i;
837 23037 MMCO *mmco = sl->mmco;
838 23037 int nb_mmco = 0;
839
840
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23037 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
841 2081 skip_bits1(gb); // broken_link
842
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2081 if (get_bits1(gb)) {
843 3 mmco[0].opcode = MMCO_LONG;
844 3 mmco[0].long_arg = 0;
845 3 nb_mmco = 1;
846 }
847 2081 sl->explicit_ref_marking = 1;
848 } else {
849 20956 sl->explicit_ref_marking = get_bits1(gb);
850
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20956 if (sl->explicit_ref_marking) {
851
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6291 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
852 6291 MMCOOpcode opcode = get_ue_golomb_31(gb);
853
854 6291 mmco[i].opcode = opcode;
855
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6291 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
856 3586 mmco[i].short_pic_num =
857 3586 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
858 3586 (sl->max_pic_num - 1);
859 }
860
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6291 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
861
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5826 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
862 875 unsigned int long_arg = get_ue_golomb_31(gb);
863
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875 if (long_arg >= 32 ||
864 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
865 long_arg == 16) &&
866 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
867 av_log(logctx, AV_LOG_ERROR,
868 "illegal long ref in memory management control "
869 "operation %d\n", opcode);
870 sl->nb_mmco = i;
871 return -1;
872 }
873 875 mmco[i].long_arg = long_arg;
874 }
875
876
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6291 if (opcode > (unsigned) MMCO_LONG) {
877 av_log(logctx, AV_LOG_ERROR,
878 "illegal memory management control operation %d\n",
879 opcode);
880 sl->nb_mmco = i;
881 return -1;
882 }
883
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6291 if (opcode == MMCO_END)
884 2180 break;
885 }
886 2180 nb_mmco = i;
887 }
888 }
889
890 23037 sl->nb_mmco = nb_mmco;
891
892 23037 return 0;
893 }
894