FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2026-09-05 20:02:20
Exec Total Coverage
Lines: 415 481 86.3%
Functions: 22 22 100.0%
Branches: 312 409 76.3%
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 72574 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41
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 290296 for (int i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
42
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 217722 if (parity == PICT_BOTTOM_FIELD)
43 104442 pic->data[i] += pic->linesize[i];
44 217722 pic->reference = parity;
45 217722 pic->linesize[i] *= 2;
46 }
47 72574 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
48 72574 }
49
50 222375 static void ref_from_h264pic(H264Ref *dst, const H264Picture *src)
51 {
52 222375 memcpy(dst->data, src->f->data, sizeof(dst->data));
53 222375 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
54 222375 dst->reference = src->reference;
55 222375 dst->poc = src->poc;
56 222375 dst->pic_id = src->pic_id;
57 222375 dst->parent = src;
58 222375 }
59
60 209515 static int split_field_copy(H264Ref *dest, const H264Picture *src,
61 int parity, int id_add)
62 {
63 209515 int match = !!(src->reference & parity);
64
65
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 209515 if (match) {
66 209515 ref_from_h264pic(dest, src);
67
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 209515 if (parity != PICT_FRAME) {
68 70957 pic_as_field(dest, parity);
69 70957 dest->pic_id *= 2;
70 70957 dest->pic_id += id_add;
71 }
72 }
73
74 209515 return match;
75 }
76
77 105136 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture * const *in, int len, int is_long, int sel)
79 {
80 105136 int i[2] = { 0 };
81 105136 int index = 0;
82
83
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 438248 while (i[0] < len || i[1] < len) {
84
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 1069697 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 841721 i[0]++;
86
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 1205720 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 977744 i[1]++;
88
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 227976 if (i[0] < len) {
89
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 172769 av_assert0(index < def_len);
90
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 172769 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 172769 split_field_copy(&def[index++], in[i[0]++], sel, 1);
92 }
93
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 227976 if (i[1] < len) {
94
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 36746 av_assert0(index < def_len);
95
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 36746 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 36746 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 }
98 }
99
100 105136 return index;
101 }
102
103 55120 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
104 int len, int limit, int dir)
105 {
106 55120 int out_i = 0;
107
108 84616 for (;;) {
109
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 139736 int best_poc = dir ? INT_MIN : INT_MAX;
110
111
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 706256 for (int i = 0; i < len; i++) {
112 566520 const int poc = src[i]->poc;
113
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 566520 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
114 97616 best_poc = poc;
115 97616 sorted[out_i] = src[i];
116 }
117 }
118
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 139736 if (best_poc == (dir ? INT_MIN : INT_MAX))
119 55120 break;
120 84616 limit = sorted[out_i++]->poc - dir;
121 }
122 55120 return out_i;
123 }
124
125 156807 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
126 {
127 156807 const AVFrame *f = pic->f;
128 313614 return (h->cur_pic_ptr->f->width != f->width ||
129
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 313614 h->cur_pic_ptr->f->height != f->height ||
130
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 156807 h->cur_pic_ptr->f->format != f->format);
131 }
132
133 38788 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
134 {
135 int len;
136
137
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 38788 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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 13780 if (FIELD_PICTURE(h))
143 5219 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
144 else
145 8561 cur_poc = h->cur_pic_ptr->poc;
146
147
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 41340 for (int list = 0; list < 2; list++) {
148 27560 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
149 27560 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
150
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 27560 av_assert0(len <= 32);
151
152 27560 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
153 sorted, len, 0, h->picture_structure);
154 55120 len += build_def_list(sl->ref_list[list] + len,
155 27560 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
156 27560 h->long_ref, 16, 1, h->picture_structure);
157
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 27560 av_assert0(len <= 32);
158
159 27560 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (32 - len));
160 27560 lens[list] = len;
161 }
162
163
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 13780 if (lens[0] == lens[1] && lens[1] > 1) {
164 int i;
165
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 16248 for (i = 0; i < lens[0] &&
166 14310 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
167
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 14310 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
168
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 12261 if (i == lens[0]) {
169 1938 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
170 }
171 }
172 } else {
173 25008 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
174 25008 h->short_ref, h->short_ref_count, 0, h->picture_structure);
175 50016 len += build_def_list(sl->ref_list[0] + len,
176 25008 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
177 25008 h-> long_ref, 16, 1, h->picture_structure);
178
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 25008 av_assert0(len <= 32);
179
180 25008 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (32 - len));
181 }
182 #ifdef TRACE
183 for (int i = 0; i < sl->ref_count[0]; i++) {
184 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
185 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
186 sl->ref_list[0][i].pic_id,
187 sl->ref_list[0][i].data[0]);
188 }
189 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
190 for (int i = 0; i < sl->ref_count[1]; i++) {
191 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
192 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
193 sl->ref_list[1][i].pic_id,
194 sl->ref_list[1][i].data[0]);
195 }
196 }
197 #endif
198
199
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 91356 for (int j = 0; j < 1 + (sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
200
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 198126 for (int i = 0; i < sl->ref_count[j]; i++) {
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 145558 if (sl->ref_list[j][i].parent) {
202
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 143947 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
203 ✗ av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
204 ✗ memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
205 }
206 }
207 }
208 }
209
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 86741 for (int i = 0; i < sl->list_count; i++)
210 47953 h->default_ref[i] = sl->ref_list[i][0];
211 38788 }
212
213 /**
214 * print short term list
215 */
216 58673 static void print_short_term(const H264Context *h)
217 {
218
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 58673 if (h->avctx->debug & FF_DEBUG_MMCO) {
219 ✗ av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
220 ✗ for (uint32_t i = 0; i < h->short_ref_count; i++) {
221 ✗ H264Picture *pic = h->short_ref[i];
222 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
223 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
224 }
225 }
226 58673 }
227
228 /**
229 * print long term list
230 */
231 58673 static void print_long_term(const H264Context *h)
232 {
233
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 58673 if (h->avctx->debug & FF_DEBUG_MMCO) {
234 ✗ av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
235 ✗ for (uint32_t i = 0; i < 16; i++) {
236 ✗ H264Picture *pic = h->long_ref[i];
237 ✗ if (pic) {
238 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
239 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
240 }
241 }
242 }
243 58673 }
244
245 /**
246 * Extract structure information about the picture described by pic_num in
247 * the current decoding context (frame or field). Note that pic_num is
248 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
249 * @param pic_num picture number for which to extract structure information
250 * @param structure one of PICT_XXX describing structure of picture
251 * with pic_num
252 * @return frame number (short term) or long term index of picture
253 * described by pic_num
254 */
255 29825 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
256 {
257 29825 *structure = h->picture_structure;
258
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 29825 if (FIELD_PICTURE(h)) {
259
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 4137 if (!(pic_num & 1))
260 /* opposite field */
261 2182 *structure ^= PICT_FRAME;
262 4137 pic_num >>= 1;
263 }
264
265 29825 return pic_num;
266 }
267
268 4976 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
269 {
270
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 11649 for (int list = 0; list < sl->list_count; list++) {
271
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 22719 for (int i = 0; i < sl->ref_count[list]; i++) {
272 16046 const H264Ref *frame = &sl->ref_list[list][i];
273 16046 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
274
275 16046 field[0] = *frame;
276
277
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 64184 for (int j = 0; j < 3; j++)
278 48138 field[0].linesize[j] <<= 1;
279 16046 field[0].reference = PICT_TOP_FIELD;
280 16046 field[0].poc = field[0].parent->field_poc[0];
281
282 16046 field[1] = field[0];
283
284
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 64184 for (int j = 0; j < 3; j++)
285 48138 field[1].data[j] += frame->parent->f->linesize[j];
286 16046 field[1].reference = PICT_BOTTOM_FIELD;
287 16046 field[1].poc = field[1].parent->field_poc[1];
288 }
289 }
290 4976 }
291
292 38788 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
293 {
294 38788 print_short_term(h);
295 38788 print_long_term(h);
296
297 38788 h264_initialise_ref_list(h, sl);
298
299
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 86741 for (int list = 0; list < sl->list_count; list++) {
300 47953 int pred = sl->curr_pic_num;
301
302
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 60813 for (int index = 0; index < sl->nb_ref_modifications[list]; index++) {
303 12860 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
304 12860 unsigned int val = sl->ref_modifications[list][index].val;
305 unsigned int pic_id;
306 int i, pic_structure;
307 12860 H264Picture *ref = NULL;
308
309
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 12860 switch (modification_of_pic_nums_idc) {
310 12297 case 0:
311 case 1: {
312 12297 const unsigned int abs_diff_pic_num = val + 1;
313 int frame_num;
314
315
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 12297 if (abs_diff_pic_num > sl->max_pic_num) {
316 ✗ av_log(h->avctx, AV_LOG_ERROR,
317 "abs_diff_pic_num overflow\n");
318 ✗ return AVERROR_INVALIDDATA;
319 }
320
321
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 12297 if (modification_of_pic_nums_idc == 0)
322 9968 pred -= abs_diff_pic_num;
323 else
324 2329 pred += abs_diff_pic_num;
325 12297 pred &= sl->max_pic_num - 1;
326
327 12297 frame_num = pic_num_extract(h, pred, &pic_structure);
328
329
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 40265 for (i = h->short_ref_count - 1; i >= 0; i--) {
330 40265 ref = h->short_ref[i];
331 assert(ref->reference);
332 assert(!ref->long_ref);
333
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 40265 if (ref->frame_num == frame_num &&
334
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 12297 (ref->reference & pic_structure))
335 12297 break;
336 }
337
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 12297 if (i >= 0)
338 12297 pic_id = pred;
339 12297 break;
340 }
341 563 case 2: {
342 int long_idx;
343 563 pic_id = val; // long_term_pic_idx
344
345 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
346
347
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 563 if (long_idx > 31U) {
348 ✗ av_log(h->avctx, AV_LOG_ERROR,
349 "long_term_pic_idx overflow\n");
350 ✗ return AVERROR_INVALIDDATA;
351 }
352 563 ref = h->long_ref[long_idx];
353 assert(!(ref && !ref->reference));
354
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 563 if (ref && (ref->reference & pic_structure)) {
355 assert(ref->long_ref);
356 563 i = 0;
357 } else {
358 ✗ i = -1;
359 }
360 563 break;
361 }
362 ✗ default:
363 ✗ av_assert0(0);
364 }
365
366
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 12860 if (i < 0 || mismatches_ref(h, ref)) {
367 ✗ av_log(h->avctx, AV_LOG_ERROR,
368 i < 0 ? "reference picture missing during reorder\n" :
369 "mismatching reference\n"
370 );
371 ✗ if (h->avctx->err_recognition & AV_EF_EXPLODE) {
372 ✗ return AVERROR_INVALIDDATA;
373 }
374 ✗ memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
375 } else {
376
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 25003 for (i = index; i + 1 < sl->ref_count[list]; i++) {
377
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 19582 if (sl->ref_list[list][i].parent &&
378
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 17901 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
379
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 15962 pic_id == sl->ref_list[list][i].pic_id)
380 7439 break;
381 }
382
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 25003 for (; i > index; i--) {
383 12143 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
384 }
385 12860 ref_from_h264pic(&sl->ref_list[list][index], ref);
386
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 12860 if (FIELD_PICTURE(h)) {
387 1617 pic_as_field(&sl->ref_list[list][index], pic_structure);
388 }
389 }
390 }
391 }
392
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 86741 for (int list = 0; list < sl->list_count; list++) {
393
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 193511 for (int index = 0; index < sl->ref_count[list]; index++) {
394
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 145558 if ( !sl->ref_list[list][index].parent
395
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 145543 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
396
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 15 if (h->avctx->err_recognition & AV_EF_EXPLODE) {
397 ✗ av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
398 ✗ return AVERROR_INVALIDDATA;
399 }
400 15 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
401
402
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 255 for (int i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
403 240 h->last_pocs[i] = INT_MIN;
404
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 15 if (h->default_ref[list].parent
405
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 15 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
406 15 sl->ref_list[list][index] = h->default_ref[list];
407 else
408 ✗ return -1;
409 }
410
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 145558 if (h->noref_gray>0 && sl->ref_list[list][index].parent->gray && h->non_gray) {
411
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 84 for (int j=0; j<sl->list_count; j++) {
412 84 int list2 = (list+j)&1;
413
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 84 if (h->default_ref[list2].parent && !h->default_ref[list2].parent->gray
414
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 42 && !(!FIELD_PICTURE(h) && (h->default_ref[list2].reference&3) != 3)) {
415 42 sl->ref_list[list][index] = h->default_ref[list2];
416 42 av_log(h->avctx, AV_LOG_DEBUG, "replacement of gray gap frame\n");
417 42 break;
418 }
419 }
420 }
421
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 145558 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
422 }
423 }
424
425
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 38788 if (FRAME_MBAFF(h))
426 4976 h264_fill_mbaff_ref_list(sl);
427
428 38788 return 0;
429 }
430
431 34253 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
432 {
433 34253 sl->nb_ref_modifications[0] = 0;
434 34253 sl->nb_ref_modifications[1] = 0;
435
436
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 82330 for (int list = 0; list < sl->list_count; list++) {
437
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 48077 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
438 44390 continue;
439
440 3687 for (int index = 0; ; index++) {
441 16619 unsigned int op = get_ue_golomb_31(&sl->gb);
442
443
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 16619 if (op == 3)
444 3687 break;
445
446
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 12932 if (index >= sl->ref_count[list]) {
447 ✗ av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
448 ✗ return AVERROR_INVALIDDATA;
449
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 12932 } else if (op > 2) {
450 ✗ av_log(logctx, AV_LOG_ERROR,
451 "illegal modification_of_pic_nums_idc %u\n",
452 op);
453 ✗ return AVERROR_INVALIDDATA;
454 }
455 12932 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
456 12932 sl->ref_modifications[list][index].op = op;
457 12932 sl->nb_ref_modifications[list]++;
458 }
459 }
460
461 34253 return 0;
462 }
463
464 /**
465 * Mark a picture as no longer needed for reference. The refmask
466 * argument allows unreferencing of individual fields or the whole frame.
467 * If the picture becomes entirely unreferenced, but is being held for
468 * display purposes, it is marked as such.
469 * @param refmask mask of fields to unreference; the mask is bitwise
470 * anded with the reference marking of pic
471 * @return non-zero if pic becomes entirely unreferenced (except possibly
472 * for display purposes) zero if one of the fields remains in
473 * reference
474 */
475 19621 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
476 {
477
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 19621 if (pic->reference &= refmask) {
478 1228 return 0;
479 } else {
480
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 36972 for (int i = 0; h->delayed_pic[i]; i++)
481
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 20121 if(pic == h->delayed_pic[i]){
482 1542 pic->reference = DELAYED_PIC_REF;
483 1542 break;
484 }
485 18393 return 1;
486 }
487 }
488
489 /**
490 * Find a H264Picture in the short term reference list by frame number.
491 * @param frame_num frame number to search for
492 * @param idx the index into h->short_ref where returned picture is found
493 * undefined if no picture found.
494 * @return pointer to the found picture, or NULL if no pic with the provided
495 * frame number is found
496 */
497 51803 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
498 {
499
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 216135 for (int i = 0; i < h->short_ref_count; i++) {
500 197768 H264Picture *pic = h->short_ref[i];
501
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 197768 if (h->avctx->debug & FF_DEBUG_MMCO)
502 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
503
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 197768 if (pic->frame_num == frame_num) {
504 33436 *idx = i;
505 33436 return pic;
506 }
507 }
508 18367 return NULL;
509 }
510
511 /**
512 * Remove a picture from the short term reference list by its index in
513 * that list. This does no checking on the provided index; it is assumed
514 * to be valid. Other list entries are shifted down.
515 * @param i index into h->short_ref of picture to remove.
516 */
517 15689 static void remove_short_at_index(H264Context *h, int i)
518 {
519 assert(i >= 0 && i < h->short_ref_count);
520 15689 h->short_ref[i] = NULL;
521
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 15689 if (--h->short_ref_count)
522 12033 memmove(&h->short_ref[i], &h->short_ref[i + 1],
523 12033 (h->short_ref_count - i) * sizeof(H264Picture*));
524 15689 }
525
526 /**
527 * @return the removed picture or NULL if an error occurs
528 */
529 34920 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
530 {
531 H264Picture *pic;
532 int i;
533
534
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 34920 if (h->avctx->debug & FF_DEBUG_MMCO)
535 ✗ av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
536
537 34920 pic = find_short(h, frame_num, &i);
538
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 34920 if (pic) {
539
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 16596 if (unreference_pic(h, pic, ref_mask))
540 15368 remove_short_at_index(h, i);
541 }
542
543 34920 return pic;
544 }
545
546 /**
547 * Remove a picture from the long term reference list by its index in
548 * that list.
549 * @return the removed picture or NULL if an error occurs
550 */
551 47167 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
552 {
553 H264Picture *pic;
554
555 47167 pic = h->long_ref[i];
556
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 47167 if (pic) {
557
1/2
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 342 if (unreference_pic(h, pic, ref_mask)) {
558 assert(h->long_ref[i]->long_ref == 1);
559 342 h->long_ref[i]->long_ref = 0;
560 342 h->long_ref[i] = NULL;
561 342 h->long_ref_count--;
562 }
563 }
564
565 47167 return pic;
566 }
567
568 2527 void ff_h264_remove_all_refs(H264Context *h)
569 {
570
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 42959 for (int i = 0; i < 16; i++)
571 40432 remove_long(h, i, 0);
572 assert(h->long_ref_count == 0);
573
574
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 2527 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
575 1236 ff_h264_unref_picture(&h->last_pic_for_ec);
576 1236 ff_h264_ref_picture(&h->last_pic_for_ec, h->short_ref[0]);
577 }
578
579
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 5210 for (int i = 0; i < h->short_ref_count; i++) {
580 2683 unreference_pic(h, h->short_ref[i], 0);
581 2683 h->short_ref[i] = NULL;
582 }
583 2527 h->short_ref_count = 0;
584
585 2527 memset(h->default_ref, 0, sizeof(h->default_ref));
586 2527 }
587
588 17031 static void generate_sliding_window_mmcos(H264Context *h)
589 {
590 17031 MMCO *mmco = h->mmco;
591 17031 int nb_mmco = 0;
592
593
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 17031 if (h->short_ref_count &&
594
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 16995 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
595
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 14374 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
596 13172 mmco[0].opcode = MMCO_SHORT2UNUSED;
597 13172 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
598 13172 nb_mmco = 1;
599
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 13172 if (FIELD_PICTURE(h)) {
600 1047 mmco[0].short_pic_num *= 2;
601 1047 mmco[1].opcode = MMCO_SHORT2UNUSED;
602 1047 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
603 1047 nb_mmco = 2;
604 }
605 }
606
607 17031 h->nb_mmco = nb_mmco;
608 17031 }
609
610 19885 int ff_h264_execute_ref_pic_marking(H264Context *h)
611 {
612 19885 MMCO *mmco = h->mmco;
613 int mmco_count;
614 19885 int pps_ref_count[2] = {0};
615 19885 int current_ref_assigned = 0, err = 0;
616
617
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 19885 if (!h->ps.sps) {
618 ✗ av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
619 ✗ err = AVERROR_INVALIDDATA;
620 ✗ goto out;
621 }
622
623
2/2
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 19885 if (!h->explicit_ref_marking)
624 17031 generate_sliding_window_mmcos(h);
625 19885 mmco_count = h->nb_mmco;
626
627
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 19885 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
628 ✗ av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
629
630
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 37293 for (int i = 0; i < mmco_count; i++) {
631
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 17408 if (h->avctx->debug & FF_DEBUG_MMCO)
632 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
633 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
634
635
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 17408 switch (mmco[i].opcode) {
636 16883 case MMCO_SHORT2UNUSED:
637 case MMCO_SHORT2LONG: {
638 int structure, j;
639 16883 int frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
640 16883 H264Picture *pic = find_short(h, frame_num, &j);
641
642
2/2
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 16883 if (!pic) {
643
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 43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
644
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 21 !h->long_ref[mmco[i].long_arg] ||
645
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 21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
646
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 22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
647 22 err = AVERROR_INVALIDDATA;
648 }
649 43 continue;
650 }
651
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 16840 if (mmco[i].opcode == MMCO_SHORT2UNUSED) {
652
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 16519 if (h->avctx->debug & FF_DEBUG_MMCO)
653 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
654 h->mmco[i].short_pic_num, h->short_ref_count);
655 16519 remove_short(h, frame_num, structure ^ PICT_FRAME);
656 } else {
657
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 321 if (h->long_ref[mmco[i].long_arg] != pic)
658 321 remove_long(h, mmco[i].long_arg, 0);
659
660 321 remove_short_at_index(h, j);
661 321 h->long_ref[ mmco[i].long_arg ] = pic;
662
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 321 if (h->long_ref[mmco[i].long_arg]) {
663 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
664 321 h->long_ref_count++;
665 }
666 }
667 16840 break;
668 }
669 82 case MMCO_LONG2UNUSED: {
670 82 int structure, j = pic_num_extract(h, mmco[i].long_arg, &structure);
671 82 H264Picture *pic = h->long_ref[j];
672
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 82 if (pic) {
673 82 remove_long(h, j, structure ^ PICT_FRAME);
674 ✗ } else if (h->avctx->debug & FF_DEBUG_MMCO)
675 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
676 82 break;
677 }
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 (int 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 (int j = mmco[i].long_arg; j < 16; j++)
718 6071 remove_long(h, j, 0);
719 407 break;
720 15 case MMCO_RESET:
721
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 68 while (h->short_ref_count) {
722 53 remove_short(h, h->short_ref[0]->frame_num, 0);
723 }
724
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 255 for (int j = 0; j < 16; j++)
725 240 remove_long(h, j, 0);
726 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
727 15 h->mmco_reset = 1;
728 15 h->cur_pic_ptr->mmco_reset = 1;
729
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 255 for (int j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++)
730 240 h->last_pocs[j] = INT_MIN;
731 15 break;
732 ✗ default: av_assert0(0);
733 }
734 }
735
736
2/2
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 19885 if (!current_ref_assigned) {
737 /* Second field of complementary field pair; the first field of
738 * which is already referenced. If short referenced, it
739 * should be first entry in short_ref. If not, it must exist
740 * in long_ref; trying to put it on the short list here is an
741 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
742 */
743
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 19864 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
744 /* Just mark the second field valid */
745 1540 h->cur_pic_ptr->reference |= h->picture_structure;
746
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✓ Branch 1 taken 18324 times.
 18324 } else if (h->cur_pic_ptr->long_ref) {
747 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
748 "assignment for second field "
749 "in complementary field pair "
750 "(first field is long term)\n");
751 ✗ err = AVERROR_INVALIDDATA;
752 } else {
753 18324 H264Picture *pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
754
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 18324 if (pic) {
755 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
756 ✗ err = AVERROR_INVALIDDATA;
757 }
758
759
2/2
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 18324 if (h->short_ref_count)
760 13448 memmove(&h->short_ref[1], &h->short_ref[0],
761 13448 h->short_ref_count * sizeof(H264Picture*));
762
763 18324 h->short_ref[0] = h->cur_pic_ptr;
764 18324 h->short_ref_count++;
765 18324 h->cur_pic_ptr->reference |= h->picture_structure;
766 }
767 }
768
769
2/2
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 19885 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
770
771 /* We have too many reference frames, probably due to corrupted
772 * stream. Need to discard one frame. Prevents overrun of the
773 * short_ref and long_ref buffers.
774 */
775 11 av_log(h->avctx, AV_LOG_ERROR,
776 "number of reference frames (%d+%d) exceeds max (%d; probably "
777 "corrupt input), discarding one\n",
778 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
779 11 err = AVERROR_INVALIDDATA;
780
781
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 11 if (h->long_ref_count && !h->short_ref_count) {
782 int i;
783 ✗ for (i = 0; i < 16; ++i)
784 ✗ if (h->long_ref[i])
785 ✗ break;
786
787 assert(i < 16);
788 ✗ remove_long(h, i, 0);
789 } else {
790 11 H264Picture *pic = h->short_ref[h->short_ref_count - 1];
791 11 remove_short(h, pic->frame_num, 0);
792 }
793 }
794
795
2/2
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 102115 for (int i = 0; i < h->short_ref_count; i++) {
796 82230 H264Picture *pic = h->short_ref[i];
797
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✓ Branch 1 taken 81876 times.
 82230 if (pic->invalid_gap) {
798 354 int d = av_zero_extend(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
799
2/2
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 354 if (d > h->ps.sps->ref_frame_count)
800 13 remove_short(h, pic->frame_num, 0);
801 }
802 }
803
804 19885 print_short_term(h);
805 19885 print_long_term(h);
806
807
2/2
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 5110445 for (int i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
808
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✓ Branch 1 taken 5070311 times.
 5090560 if (h->ps.pps_list[i]) {
809 20249 const PPS *pps = h->ps.pps_list[i];
810 20249 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
811 20249 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
812 }
813 }
814
815 // Detect unmarked random access points
816
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 19885 if ( err >= 0
817
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 19874 && h->long_ref_count==0
818
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 18829 && ( h->short_ref_count<=2
819
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 10244 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
820
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 9321 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
821
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 10213 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
822
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 8977 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
823 2376 h->cur_pic_ptr->recovered |= FRAME_RECOVERED_HEURISTIC;
824
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 2376 if(!h->avctx->has_b_frames)
825 1625 h->frame_recovered |= FRAME_RECOVERED_HEURISTIC;
826 }
827
828 18260 out:
829
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 19885 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
830 }
831
832 25909 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
833 const H2645NAL *nal, void *logctx)
834 {
835 25909 MMCO *mmco = sl->mmco;
836 25909 int nb_mmco = 0;
837
838
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 25909 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
839 2382 skip_bits1(gb); // broken_link
840
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 2382 if (get_bits1(gb)) {
841 3 mmco[0].opcode = MMCO_LONG;
842 3 mmco[0].long_arg = 0;
843 3 nb_mmco = 1;
844 }
845 2382 sl->explicit_ref_marking = 1;
846 } else {
847 23527 sl->explicit_ref_marking = get_bits1(gb);
848
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 23527 if (sl->explicit_ref_marking) {
849 int i;
850
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 7096 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
851 7096 MMCOOpcode opcode = get_ue_golomb_31(gb);
852
853 7096 mmco[i].opcode = opcode;
854
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 7096 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
855 4130 mmco[i].short_pic_num =
856 4130 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
857 4130 (sl->max_pic_num - 1);
858 }
859
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 7096 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
860
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 6631 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
861 875 unsigned int long_arg = get_ue_golomb_31(gb);
862
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 875 if (long_arg >= 32 ||
863 ✗ (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
864 ✗ long_arg == 16) &&
865 ✗ !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
866 ✗ av_log(logctx, AV_LOG_ERROR,
867 "illegal long ref in memory management control "
868 "operation %d\n", opcode);
869 ✗ sl->nb_mmco = i;
870 ✗ return -1;
871 }
872 875 mmco[i].long_arg = long_arg;
873 }
874
875
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 7096 if (opcode > (unsigned) MMCO_LONG) {
876 ✗ av_log(logctx, AV_LOG_ERROR,
877 "illegal memory management control operation %d\n",
878 opcode);
879 ✗ sl->nb_mmco = i;
880 ✗ return -1;
881 }
882
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 7096 if (opcode == MMCO_END)
883 2441 break;
884 }
885 2441 nb_mmco = i;
886 }
887 }
888
889 25909 sl->nb_mmco = nb_mmco;
890
891 25909 return 0;
892 }
893