FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2025-08-19 23:55:23
Exec Total Coverage
Lines: 417 483 86.3%
Functions: 22 22 100.0%
Branches: 316 413 76.5%
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 67870 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41
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 271480 for (int i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
42
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 203610 if (parity == PICT_BOTTOM_FIELD)
43 97512 pic->data[i] += pic->linesize[i];
44 203610 pic->reference = parity;
45 203610 pic->linesize[i] *= 2;
46 }
47 67870 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
48 67870 }
49
50 215347 static void ref_from_h264pic(H264Ref *dst, const H264Picture *src)
51 {
52 215347 memcpy(dst->data, src->f->data, sizeof(dst->data));
53 215347 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
54 215347 dst->reference = src->reference;
55 215347 dst->poc = src->poc;
56 215347 dst->pic_id = src->pic_id;
57 215347 dst->parent = src;
58 215347 }
59
60 202587 static int split_field_copy(H264Ref *dest, const H264Picture *src,
61 int parity, int id_add)
62 {
63 202587 int match = !!(src->reference & parity);
64
65
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 202587 if (match) {
66 202587 ref_from_h264pic(dest, src);
67
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 202587 if (parity != PICT_FRAME) {
68 66253 pic_as_field(dest, parity);
69 66253 dest->pic_id *= 2;
70 66253 dest->pic_id += id_add;
71 }
72 }
73
74 202587 return match;
75 }
76
77 101768 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture * const *in, int len, int is_long, int sel)
79 {
80 101768 int i[2] = { 0 };
81 101768 int index = 0;
82
83
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 425210 while (i[0] < len || i[1] < len) {
84
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 1036367 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 814693 i[0]++;
86
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 1170250 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 948576 i[1]++;
88
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 221674 if (i[0] < len) {
89
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 168235 av_assert0(index < def_len);
90
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 168235 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 168235 split_field_copy(&def[index++], in[i[0]++], sel, 1);
92 }
93
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 221674 if (i[1] < len) {
94
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 34352 av_assert0(index < def_len);
95
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 34352 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 34352 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 }
98 }
99
100 101768 return index;
101 }
102
103 53176 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
104 int len, int limit, int dir)
105 {
106 53176 int out_i = 0;
107
108 81328 for (;;) {
109
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 134504 int best_poc = dir ? INT_MIN : INT_MAX;
110
111
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 681744 for (int i = 0; i < len; i++) {
112 547240 const int poc = src[i]->poc;
113
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 547240 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
114 93774 best_poc = poc;
115 93774 sorted[out_i] = src[i];
116 }
117 }
118
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 134504 if (best_poc == (dir ? INT_MIN : INT_MAX))
119 53176 break;
120 81328 limit = sorted[out_i++]->poc - dir;
121 }
122 53176 return out_i;
123 }
124
125 152540 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
126 {
127 152540 const AVFrame *f = pic->f;
128 305080 return (h->cur_pic_ptr->f->width != f->width ||
129
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 305080 h->cur_pic_ptr->f->height != f->height ||
130
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 152540 h->cur_pic_ptr->f->format != f->format);
131 }
132
133 37590 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
134 {
135 int len;
136
137
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 37590 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
138 H264Picture *sorted[32];
139 int cur_poc;
140 int lens[2];
141
142
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 13294 if (FIELD_PICTURE(h))
143 4995 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
144 else
145 8299 cur_poc = h->cur_pic_ptr->poc;
146
147
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 39882 for (int list = 0; list < 2; list++) {
148 26588 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
149 26588 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
150
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 26588 av_assert0(len <= 32);
151
152 26588 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
153 sorted, len, 0, h->picture_structure);
154 53176 len += build_def_list(sl->ref_list[list] + len,
155 26588 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
156 26588 h->long_ref, 16, 1, h->picture_structure);
157
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 26588 av_assert0(len <= 32);
158
159
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 26588 if (len < sl->ref_count[list])
160 5 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
161 26588 lens[list] = len;
162 }
163
164
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 13294 if (lens[0] == lens[1] && lens[1] > 1) {
165 int i;
166
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 15758 for (i = 0; i < lens[0] &&
167 13822 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
168
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 13822 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
169
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 11775 if (i == lens[0]) {
170 1936 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
171 }
172 }
173 } else {
174 24296 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
175 24296 h->short_ref, h->short_ref_count, 0, h->picture_structure);
176 48592 len += build_def_list(sl->ref_list[0] + len,
177 24296 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
178 24296 h-> long_ref, 16, 1, h->picture_structure);
179
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 24296 av_assert0(len <= 32);
180
181
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 24296 if (len < sl->ref_count[0])
182 904 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
183 }
184 #ifdef TRACE
185 for (int i = 0; i < sl->ref_count[0]; i++) {
186 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
187 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
188 sl->ref_list[0][i].pic_id,
189 sl->ref_list[0][i].data[0]);
190 }
191 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
192 for (int i = 0; i < sl->ref_count[1]; i++) {
193 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
194 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
195 sl->ref_list[1][i].pic_id,
196 sl->ref_list[1][i].data[0]);
197 }
198 }
199 #endif
200
201
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 88474 for (int j = 0; j < 1 + (sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
202
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 192264 for (int i = 0; i < sl->ref_count[j]; i++) {
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 141380 if (sl->ref_list[j][i].parent) {
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 139780 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
205 ✗ av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
206 ✗ memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
207 }
208 }
209 }
210 }
211
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 83994 for (int i = 0; i < sl->list_count; i++)
212 46404 h->default_ref[i] = sl->ref_list[i][0];
213 37590 }
214
215 /**
216 * print short term list
217 */
218 56879 static void print_short_term(const H264Context *h)
219 {
220
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 56879 if (h->avctx->debug & FF_DEBUG_MMCO) {
221 ✗ av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
222 ✗ for (uint32_t i = 0; i < h->short_ref_count; i++) {
223 ✗ H264Picture *pic = h->short_ref[i];
224 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
225 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
226 }
227 }
228 56879 }
229
230 /**
231 * print long term list
232 */
233 56879 static void print_long_term(const H264Context *h)
234 {
235
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 56879 if (h->avctx->debug & FF_DEBUG_MMCO) {
236 ✗ av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
237 ✗ for (uint32_t i = 0; i < 16; i++) {
238 ✗ H264Picture *pic = h->long_ref[i];
239 ✗ if (pic) {
240 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
241 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
242 }
243 }
244 }
245 56879 }
246
247 /**
248 * Extract structure information about the picture described by pic_num in
249 * the current decoding context (frame or field). Note that pic_num is
250 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
251 * @param pic_num picture number for which to extract structure information
252 * @param structure one of PICT_XXX describing structure of picture
253 * with pic_num
254 * @return frame number (short term) or long term index of picture
255 * described by pic_num
256 */
257 29276 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
258 {
259 29276 *structure = h->picture_structure;
260
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 29276 if (FIELD_PICTURE(h)) {
261
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 4133 if (!(pic_num & 1))
262 /* opposite field */
263 2180 *structure ^= PICT_FRAME;
264 4133 pic_num >>= 1;
265 }
266
267 29276 return pic_num;
268 }
269
270 4976 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
271 {
272
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 11649 for (int list = 0; list < sl->list_count; list++) {
273
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 22719 for (int i = 0; i < sl->ref_count[list]; i++) {
274 16046 const H264Ref *frame = &sl->ref_list[list][i];
275 16046 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
276
277 16046 field[0] = *frame;
278
279
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 64184 for (int j = 0; j < 3; j++)
280 48138 field[0].linesize[j] <<= 1;
281 16046 field[0].reference = PICT_TOP_FIELD;
282 16046 field[0].poc = field[0].parent->field_poc[0];
283
284 16046 field[1] = field[0];
285
286
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 64184 for (int j = 0; j < 3; j++)
287 48138 field[1].data[j] += frame->parent->f->linesize[j];
288 16046 field[1].reference = PICT_BOTTOM_FIELD;
289 16046 field[1].poc = field[1].parent->field_poc[1];
290 }
291 }
292 4976 }
293
294 37590 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
295 {
296 37590 print_short_term(h);
297 37590 print_long_term(h);
298
299 37590 h264_initialise_ref_list(h, sl);
300
301
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 83994 for (int list = 0; list < sl->list_count; list++) {
302 46404 int pred = sl->curr_pic_num;
303
304
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 59164 for (int index = 0; index < sl->nb_ref_modifications[list]; index++) {
305 12760 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
306 12760 unsigned int val = sl->ref_modifications[list][index].val;
307 unsigned int pic_id;
308 int i, pic_structure;
309 12760 H264Picture *ref = NULL;
310
311
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 12760 switch (modification_of_pic_nums_idc) {
312 12197 case 0:
313 case 1: {
314 12197 const unsigned int abs_diff_pic_num = val + 1;
315 int frame_num;
316
317
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 12197 if (abs_diff_pic_num > sl->max_pic_num) {
318 ✗ av_log(h->avctx, AV_LOG_ERROR,
319 "abs_diff_pic_num overflow\n");
320 ✗ return AVERROR_INVALIDDATA;
321 }
322
323
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 12197 if (modification_of_pic_nums_idc == 0)
324 9895 pred -= abs_diff_pic_num;
325 else
326 2302 pred += abs_diff_pic_num;
327 12197 pred &= sl->max_pic_num - 1;
328
329 12197 frame_num = pic_num_extract(h, pred, &pic_structure);
330
331
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 40001 for (i = h->short_ref_count - 1; i >= 0; i--) {
332 40001 ref = h->short_ref[i];
333 assert(ref->reference);
334 assert(!ref->long_ref);
335
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 40001 if (ref->frame_num == frame_num &&
336
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 12197 (ref->reference & pic_structure))
337 12197 break;
338 }
339
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 12197 if (i >= 0)
340 12197 pic_id = pred;
341 12197 break;
342 }
343 563 case 2: {
344 int long_idx;
345 563 pic_id = val; // long_term_pic_idx
346
347 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
348
349
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 563 if (long_idx > 31U) {
350 ✗ av_log(h->avctx, AV_LOG_ERROR,
351 "long_term_pic_idx overflow\n");
352 ✗ return AVERROR_INVALIDDATA;
353 }
354 563 ref = h->long_ref[long_idx];
355 assert(!(ref && !ref->reference));
356
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 563 if (ref && (ref->reference & pic_structure)) {
357 assert(ref->long_ref);
358 563 i = 0;
359 } else {
360 ✗ i = -1;
361 }
362 563 break;
363 }
364 ✗ default:
365 ✗ av_assert0(0);
366 }
367
368
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 12760 if (i < 0 || mismatches_ref(h, ref)) {
369 ✗ av_log(h->avctx, AV_LOG_ERROR,
370 i < 0 ? "reference picture missing during reorder\n" :
371 "mismatching reference\n"
372 );
373 ✗ if (h->avctx->err_recognition & AV_EF_EXPLODE) {
374 ✗ return AVERROR_INVALIDDATA;
375 }
376 ✗ memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
377 } else {
378
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 24822 for (i = index; i + 1 < sl->ref_count[list]; i++) {
379
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 19447 if (sl->ref_list[list][i].parent &&
380
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 17766 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
381
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 15827 pic_id == sl->ref_list[list][i].pic_id)
382 7385 break;
383 }
384
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 24822 for (; i > index; i--) {
385 12062 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
386 }
387 12760 ref_from_h264pic(&sl->ref_list[list][index], ref);
388
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 12760 if (FIELD_PICTURE(h)) {
389 1617 pic_as_field(&sl->ref_list[list][index], pic_structure);
390 }
391 }
392 }
393 }
394
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 83994 for (int list = 0; list < sl->list_count; list++) {
395
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 187784 for (int index = 0; index < sl->ref_count[list]; index++) {
396
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 141380 if ( !sl->ref_list[list][index].parent
397
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 141365 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
398
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 15 if (h->avctx->err_recognition & AV_EF_EXPLODE) {
399 ✗ av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
400 ✗ return AVERROR_INVALIDDATA;
401 }
402 15 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
403
404
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 255 for (int i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
405 240 h->last_pocs[i] = INT_MIN;
406
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 15 if (h->default_ref[list].parent
407
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 15 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
408 15 sl->ref_list[list][index] = h->default_ref[list];
409 else
410 ✗ return -1;
411 }
412
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 141380 if (h->noref_gray>0 && sl->ref_list[list][index].parent->gray && h->non_gray) {
413
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 84 for (int j=0; j<sl->list_count; j++) {
414 84 int list2 = (list+j)&1;
415
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 84 if (h->default_ref[list2].parent && !h->default_ref[list2].parent->gray
416
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 42 && !(!FIELD_PICTURE(h) && (h->default_ref[list2].reference&3) != 3)) {
417 42 sl->ref_list[list][index] = h->default_ref[list2];
418 42 av_log(h->avctx, AV_LOG_DEBUG, "replacement of gray gap frame\n");
419 42 break;
420 }
421 }
422 }
423
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 141380 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
424 }
425 }
426
427
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 37590 if (FRAME_MBAFF(h))
428 4976 h264_fill_mbaff_ref_list(sl);
429
430 37590 return 0;
431 }
432
433 33190 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
434 {
435 33190 sl->nb_ref_modifications[0] = 0;
436 33190 sl->nb_ref_modifications[1] = 0;
437
438
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 79718 for (int list = 0; list < sl->list_count; list++) {
439
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 46528 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
440 42864 continue;
441
442 3664 for (int index = 0; ; index++) {
443 16496 unsigned int op = get_ue_golomb_31(&sl->gb);
444
445
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 16496 if (op == 3)
446 3664 break;
447
448
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 12832 if (index >= sl->ref_count[list]) {
449 ✗ av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
450 ✗ return AVERROR_INVALIDDATA;
451
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 12832 } else if (op > 2) {
452 ✗ av_log(logctx, AV_LOG_ERROR,
453 "illegal modification_of_pic_nums_idc %u\n",
454 op);
455 ✗ return AVERROR_INVALIDDATA;
456 }
457 12832 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
458 12832 sl->ref_modifications[list][index].op = op;
459 12832 sl->nb_ref_modifications[list]++;
460 }
461 }
462
463 33190 return 0;
464 }
465
466 /**
467 * Mark a picture as no longer needed for reference. The refmask
468 * argument allows unreferencing of individual fields or the whole frame.
469 * If the picture becomes entirely unreferenced, but is being held for
470 * display purposes, it is marked as such.
471 * @param refmask mask of fields to unreference; the mask is bitwise
472 * anded with the reference marking of pic
473 * @return non-zero if pic becomes entirely unreferenced (except possibly
474 * for display purposes) zero if one of the fields remains in
475 * reference
476 */
477 19035 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
478 {
479
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 19035 if (pic->reference &= refmask) {
480 1226 return 0;
481 } else {
482
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 35741 for (int i = 0; h->delayed_pic[i]; i++)
483
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 19414 if(pic == h->delayed_pic[i]){
484 1482 pic->reference = DELAYED_PIC_REF;
485 1482 break;
486 }
487 17809 return 1;
488 }
489 }
490
491 /**
492 * Find a H264Picture in the short term reference list by frame number.
493 * @param frame_num frame number to search for
494 * @param idx the index into h->short_ref where returned picture is found
495 * undefined if no picture found.
496 * @return pointer to the found picture, or NULL if no pic with the provided
497 * frame number is found
498 */
499 50321 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
500 {
501
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 213258 for (int i = 0; i < h->short_ref_count; i++) {
502 195475 H264Picture *pic = h->short_ref[i];
503
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 195475 if (h->avctx->debug & FF_DEBUG_MMCO)
504 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
505
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 195475 if (pic->frame_num == frame_num) {
506 32538 *idx = i;
507 32538 return pic;
508 }
509 }
510 17783 return NULL;
511 }
512
513 /**
514 * Remove a picture from the short term reference list by its index in
515 * that list. This does no checking on the provided index; it is assumed
516 * to be valid. Other list entries are shifted down.
517 * @param i index into h->short_ref of picture to remove.
518 */
519 15242 static void remove_short_at_index(H264Context *h, int i)
520 {
521 assert(i >= 0 && i < h->short_ref_count);
522 15242 h->short_ref[i] = NULL;
523
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 15242 if (--h->short_ref_count)
524 11715 memmove(&h->short_ref[i], &h->short_ref[i + 1],
525 11715 (h->short_ref_count - i) * sizeof(H264Picture*));
526 15242 }
527
528 /**
529 * @return the removed picture or NULL if an error occurs
530 */
531 33887 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
532 {
533 H264Picture *pic;
534 int i;
535
536
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 33887 if (h->avctx->debug & FF_DEBUG_MMCO)
537 ✗ av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
538
539 33887 pic = find_short(h, frame_num, &i);
540
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 33887 if (pic) {
541
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✓ Branch 2 taken 1226 times.
 16147 if (unreference_pic(h, pic, ref_mask))
542 14921 remove_short_at_index(h, i);
543 }
544
545 33887 return pic;
546 }
547
548 /**
549 * Remove a picture from the long term reference list by its index in
550 * that list.
551 * @return the removed picture or NULL if an error occurs
552 */
553 44463 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
554 {
555 H264Picture *pic;
556
557 44463 pic = h->long_ref[i];
558
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 44463 if (pic) {
559
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 342 if (unreference_pic(h, pic, ref_mask)) {
560 assert(h->long_ref[i]->long_ref == 1);
561 342 h->long_ref[i]->long_ref = 0;
562 342 h->long_ref[i] = NULL;
563 342 h->long_ref_count--;
564 }
565 }
566
567 44463 return pic;
568 }
569
570 2358 void ff_h264_remove_all_refs(H264Context *h)
571 {
572
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 40086 for (int i = 0; i < 16; i++)
573 37728 remove_long(h, i, 0);
574 assert(h->long_ref_count == 0);
575
576
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 2358 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
577 1136 ff_h264_unref_picture(&h->last_pic_for_ec);
578 1136 ff_h264_ref_picture(&h->last_pic_for_ec, h->short_ref[0]);
579 }
580
581
2/2
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 4904 for (int i = 0; i < h->short_ref_count; i++) {
582 2546 unreference_pic(h, h->short_ref[i], 0);
583 2546 h->short_ref[i] = NULL;
584 }
585 2358 h->short_ref_count = 0;
586
587 2358 memset(h->default_ref, 0, sizeof(h->default_ref));
588 2358 }
589
590 16603 static void generate_sliding_window_mmcos(H264Context *h)
591 {
592 16603 MMCO *mmco = h->mmco;
593 16603 int nb_mmco = 0;
594
595
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 16603 if (h->short_ref_count &&
596
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 16569 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
597
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 14003 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
598 12805 mmco[0].opcode = MMCO_SHORT2UNUSED;
599 12805 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
600 12805 nb_mmco = 1;
601
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 12805 if (FIELD_PICTURE(h)) {
602 1045 mmco[0].short_pic_num *= 2;
603 1045 mmco[1].opcode = MMCO_SHORT2UNUSED;
604 1045 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
605 1045 nb_mmco = 2;
606 }
607 }
608
609 16603 h->nb_mmco = nb_mmco;
610 16603 }
611
612 19289 int ff_h264_execute_ref_pic_marking(H264Context *h)
613 {
614 19289 MMCO *mmco = h->mmco;
615 int mmco_count;
616 19289 int pps_ref_count[2] = {0};
617 19289 int current_ref_assigned = 0, err = 0;
618
619
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 19289 if (!h->ps.sps) {
620 ✗ av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
621 ✗ err = AVERROR_INVALIDDATA;
622 ✗ goto out;
623 }
624
625
2/2
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 19289 if (!h->explicit_ref_marking)
626 16603 generate_sliding_window_mmcos(h);
627 19289 mmco_count = h->nb_mmco;
628
629
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 19289 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
630 ✗ av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
631
632
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 36248 for (int i = 0; i < mmco_count; i++) {
633
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 16959 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
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 16959 switch (mmco[i].opcode) {
638 16434 case MMCO_SHORT2UNUSED:
639 case MMCO_SHORT2LONG: {
640 int structure, j;
641 16434 int frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
642 16434 H264Picture *pic = find_short(h, frame_num, &j);
643
644
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 16434 if (!pic) {
645
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 43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
646
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 21 !h->long_ref[mmco[i].long_arg] ||
647
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 21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
648
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 22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
649 22 err = AVERROR_INVALIDDATA;
650 }
651 43 continue;
652 }
653
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 16391 if (mmco[i].opcode == MMCO_SHORT2UNUSED) {
654
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 16070 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 16070 remove_short(h, frame_num, structure ^ PICT_FRAME);
658 } else {
659
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 321 if (h->long_ref[mmco[i].long_arg] != pic)
660 321 remove_long(h, mmco[i].long_arg, 0);
661
662 321 remove_short_at_index(h, j);
663 321 h->long_ref[ mmco[i].long_arg ] = pic;
664
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 321 if (h->long_ref[mmco[i].long_arg]) {
665 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
666 321 h->long_ref_count++;
667 }
668 }
669 16391 break;
670 }
671 82 case MMCO_LONG2UNUSED: {
672 82 int structure, j = pic_num_extract(h, mmco[i].long_arg, &structure);
673 82 H264Picture *pic = h->long_ref[j];
674
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 82 if (pic) {
675 82 remove_long(h, j, structure ^ PICT_FRAME);
676 ✗ } else if (h->avctx->debug & FF_DEBUG_MMCO)
677 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
678 82 break;
679 }
680 21 case MMCO_LONG:
681 // Comment below left from previous code as it is an interesting note.
682 /* First field in pair is in short term list or
683 * at a different long term index.
684 * This is not allowed; see 7.4.3.3, notes 2 and 3.
685 * Report the problem and keep the pair where it is,
686 * and mark this field valid.
687 */
688
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 21 if (h->short_ref[0] == h->cur_pic_ptr) {
689 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
690 ✗ remove_short_at_index(h, 0);
691 }
692
693 /* make sure the current picture is not already assigned as a long ref */
694
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 21 if (h->cur_pic_ptr->long_ref) {
695 ✗ for (int j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
696 ✗ if (h->long_ref[j] == h->cur_pic_ptr) {
697 ✗ if (j != mmco[i].long_arg)
698 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
699 ✗ remove_long(h, j, 0);
700 }
701 }
702 }
703
704
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 21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
705
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 21 av_assert0(!h->cur_pic_ptr->long_ref);
706 21 remove_long(h, mmco[i].long_arg, 0);
707
708 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
709 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
710 21 h->long_ref_count++;
711 }
712
713 21 h->cur_pic_ptr->reference |= h->picture_structure;
714 21 current_ref_assigned = 1;
715 21 break;
716 407 case MMCO_SET_MAX_LONG:
717 assert(mmco[i].long_arg <= 16);
718 // just remove the long term which index is greater than new max
719
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 6478 for (int j = mmco[i].long_arg; j < 16; j++)
720 6071 remove_long(h, j, 0);
721 407 break;
722 15 case MMCO_RESET:
723
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 68 while (h->short_ref_count) {
724 53 remove_short(h, h->short_ref[0]->frame_num, 0);
725 }
726
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 255 for (int j = 0; j < 16; j++)
727 240 remove_long(h, j, 0);
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 (int 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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 19289 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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 19268 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
746 /* Just mark the second field valid */
747 1528 h->cur_pic_ptr->reference |= h->picture_structure;
748
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✓ Branch 1 taken 17740 times.
 17740 } 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 17740 H264Picture *pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
756
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 17740 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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 17740 if (h->short_ref_count)
762 13093 memmove(&h->short_ref[1], &h->short_ref[0],
763 13093 h->short_ref_count * sizeof(H264Picture*));
764
765 17740 h->short_ref[0] = h->cur_pic_ptr;
766 17740 h->short_ref_count++;
767 17740 h->cur_pic_ptr->reference |= h->picture_structure;
768 }
769 }
770
771
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 19289 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 int i;
785 ✗ for (i = 0; i < 16; ++i)
786 ✗ if (h->long_ref[i])
787 ✗ break;
788
789 assert(i < 16);
790 ✗ remove_long(h, i, 0);
791 } else {
792 11 H264Picture *pic = h->short_ref[h->short_ref_count - 1];
793 11 remove_short(h, pic->frame_num, 0);
794 }
795 }
796
797
2/2
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 100380 for (int i = 0; i < h->short_ref_count; i++) {
798 81091 H264Picture *pic = h->short_ref[i];
799
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✓ Branch 1 taken 80744 times.
 81091 if (pic->invalid_gap) {
800 347 int d = av_zero_extend(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
801
2/2
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 347 if (d > h->ps.sps->ref_frame_count)
802 13 remove_short(h, pic->frame_num, 0);
803 }
804 }
805
806 19289 print_short_term(h);
807 19289 print_long_term(h);
808
809
2/2
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 4957273 for (int i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
810
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✓ Branch 1 taken 4918331 times.
 4937984 if (h->ps.pps_list[i]) {
811 19653 const PPS *pps = h->ps.pps_list[i];
812 19653 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
813 19653 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
814 }
815 }
816
817 // Detect unmarked random access points
818
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 19289 if ( err >= 0
819
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 19278 && h->long_ref_count==0
820
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 18233 && ( h->short_ref_count<=2
821
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 10163 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
822
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 9259 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
823
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 9679 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
824
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 8467 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
825 2274 h->cur_pic_ptr->recovered |= FRAME_RECOVERED_HEURISTIC;
826
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 2274 if(!h->avctx->has_b_frames)
827 1533 h->frame_recovered |= FRAME_RECOVERED_HEURISTIC;
828 }
829
830 17756 out:
831
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 19289 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
832 }
833
834 25173 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
835 const H2645NAL *nal, void *logctx)
836 {
837 25173 MMCO *mmco = sl->mmco;
838 25173 int nb_mmco = 0;
839
840
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 25173 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
841 2272 skip_bits1(gb); // broken_link
842
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 2272 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 2272 sl->explicit_ref_marking = 1;
848 } else {
849 22901 sl->explicit_ref_marking = get_bits1(gb);
850
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 22901 if (sl->explicit_ref_marking) {
851 int i;
852
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 6946 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
853 6946 MMCOOpcode opcode = get_ue_golomb_31(gb);
854
855 6946 mmco[i].opcode = opcode;
856
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 6946 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
857 4050 mmco[i].short_pic_num =
858 4050 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
859 4050 (sl->max_pic_num - 1);
860 }
861
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 6946 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
862
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 6481 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
863 875 unsigned int long_arg = get_ue_golomb_31(gb);
864
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 875 if (long_arg >= 32 ||
865 ✗ (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
866 ✗ long_arg == 16) &&
867 ✗ !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
868 ✗ av_log(logctx, AV_LOG_ERROR,
869 "illegal long ref in memory management control "
870 "operation %d\n", opcode);
871 ✗ sl->nb_mmco = i;
872 ✗ return -1;
873 }
874 875 mmco[i].long_arg = long_arg;
875 }
876
877
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 6946 if (opcode > (unsigned) MMCO_LONG) {
878 ✗ av_log(logctx, AV_LOG_ERROR,
879 "illegal memory management control operation %d\n",
880 opcode);
881 ✗ sl->nb_mmco = i;
882 ✗ return -1;
883 }
884
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 6946 if (opcode == MMCO_END)
885 2371 break;
886 }
887 2371 nb_mmco = i;
888 }
889 }
890
891 25173 sl->nb_mmco = nb_mmco;
892
893 25173 return 0;
894 }
895