FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2025-03-22 04:08:01
Exec Total Coverage
Lines: 417 479 87.1%
Functions: 22 22 100.0%
Branches: 315 409 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 67860 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41
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 271440 for (int i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
42
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 203580 if (parity == PICT_BOTTOM_FIELD)
43 97497 pic->data[i] += pic->linesize[i];
44 203580 pic->reference = parity;
45 203580 pic->linesize[i] *= 2;
46 }
47 67860 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
48 67860 }
49
50 215310 static void ref_from_h264pic(H264Ref *dst, const H264Picture *src)
51 {
52 215310 memcpy(dst->data, src->f->data, sizeof(dst->data));
53 215310 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
54 215310 dst->reference = src->reference;
55 215310 dst->poc = src->poc;
56 215310 dst->pic_id = src->pic_id;
57 215310 dst->parent = src;
58 215310 }
59
60 202559 static int split_field_copy(H264Ref *dest, const H264Picture *src,
61 int parity, int id_add)
62 {
63 202559 int match = !!(src->reference & parity);
64
65
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 202559 if (match) {
66 202559 ref_from_h264pic(dest, src);
67
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 202559 if (parity != PICT_FRAME) {
68 66245 pic_as_field(dest, parity);
69 66245 dest->pic_id *= 2;
70 66245 dest->pic_id += id_add;
71 }
72 }
73
74 202559 return match;
75 }
76
77 101744 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture * const *in, int len, int is_long, int sel)
79 {
80 101744 int i[2] = { 0 };
81 101744 int index = 0;
82
83
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 425126 while (i[0] < len || i[1] < len) {
84
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 1036139 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 814501 i[0]++;
86
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 1170002 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 948364 i[1]++;
88
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 221638 if (i[0] < len) {
89
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 168211 av_assert0(index < def_len);
90
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 168211 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 168211 split_field_copy(&def[index++], in[i[0]++], sel, 1);
92 }
93
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 221638 if (i[1] < len) {
94
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 34348 av_assert0(index < def_len);
95
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 34348 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 34348 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 }
98 }
99
100 101744 return index;
101 }
102
103 53160 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
104 int len, int limit, int dir)
105 {
106 53160 int out_i = 0;
107
108 81312 for (;;) {
109
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 134472 int best_poc = dir ? INT_MIN : INT_MAX;
110
111
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 681636 for (int i = 0; i < len; i++) {
112 547164 const int poc = src[i]->poc;
113
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 547164 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
114 93756 best_poc = poc;
115 93756 sorted[out_i] = src[i];
116 }
117 }
118
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 134472 if (best_poc == (dir ? INT_MIN : INT_MAX))
119 53160 break;
120 81312 limit = sorted[out_i++]->poc - dir;
121 }
122 53160 return out_i;
123 }
124
125 152513 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
126 {
127 152513 const AVFrame *f = pic->f;
128 305026 return (h->cur_pic_ptr->f->width != f->width ||
129
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 305026 h->cur_pic_ptr->f->height != f->height ||
130
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 152513 h->cur_pic_ptr->f->format != f->format);
131 }
132
133 37582 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
134 {
135 int len;
136
137
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 37582 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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 13290 if (FIELD_PICTURE(h))
143 4993 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
144 else
145 8297 cur_poc = h->cur_pic_ptr->poc;
146
147
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 39870 for (int list = 0; list < 2; list++) {
148 26580 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
149 26580 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
150
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 26580 av_assert0(len <= 32);
151
152 26580 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
153 sorted, len, 0, h->picture_structure);
154 53160 len += build_def_list(sl->ref_list[list] + len,
155 26580 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
156 26580 h->long_ref, 16, 1, h->picture_structure);
157
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 26580 av_assert0(len <= 32);
158
159
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 26580 if (len < sl->ref_count[list])
160 5 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
161 26580 lens[list] = len;
162 }
163
164
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 13290 if (lens[0] == lens[1] && lens[1] > 1) {
165 int i;
166
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 15750 for (i = 0; i < lens[0] &&
167 13816 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
168
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 13816 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
169
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 11771 if (i == lens[0]) {
170 1934 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
171 }
172 }
173 } else {
174 24292 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
175 24292 h->short_ref, h->short_ref_count, 0, h->picture_structure);
176 48584 len += build_def_list(sl->ref_list[0] + len,
177 24292 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
178 24292 h-> long_ref, 16, 1, h->picture_structure);
179
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 24292 av_assert0(len <= 32);
180
181
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 24292 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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 88454 for (int j = 0; j < 1 + (sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
202
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 192234 for (int i = 0; i < sl->ref_count[j]; i++) {
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 141362 if (sl->ref_list[j][i].parent) {
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 139762 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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 83976 for (int i = 0; i < sl->list_count; i++)
212 46394 h->default_ref[i] = sl->ref_list[i][0];
213 37582 }
214
215 /**
216 * print short term list
217 */
218 56866 static void print_short_term(const H264Context *h)
219 {
220
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 56866 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 56866 }
229
230 /**
231 * print long term list
232 */
233 56866 static void print_long_term(const H264Context *h)
234 {
235
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 56866 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 56866 }
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 29265 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
258 {
259 29265 *structure = h->picture_structure;
260
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 29265 if (FIELD_PICTURE(h)) {
261
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 4131 if (!(pic_num & 1))
262 /* opposite field */
263 2180 *structure ^= PICT_FRAME;
264 4131 pic_num >>= 1;
265 }
266
267 29265 return pic_num;
268 }
269
270 4975 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
271 {
272
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 11646 for (int list = 0; list < sl->list_count; list++) {
273
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 22713 for (int i = 0; i < sl->ref_count[list]; i++) {
274 16042 const H264Ref *frame = &sl->ref_list[list][i];
275 16042 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
276
277 16042 field[0] = *frame;
278
279
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 64168 for (int j = 0; j < 3; j++)
280 48126 field[0].linesize[j] <<= 1;
281 16042 field[0].reference = PICT_TOP_FIELD;
282 16042 field[0].poc = field[0].parent->field_poc[0];
283
284 16042 field[1] = field[0];
285
286
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 64168 for (int j = 0; j < 3; j++)
287 48126 field[1].data[j] += frame->parent->f->linesize[j];
288 16042 field[1].reference = PICT_BOTTOM_FIELD;
289 16042 field[1].poc = field[1].parent->field_poc[1];
290 }
291 }
292 4975 }
293
294 37582 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
295 {
296 37582 print_short_term(h);
297 37582 print_long_term(h);
298
299 37582 h264_initialise_ref_list(h, sl);
300
301
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 83976 for (int list = 0; list < sl->list_count; list++) {
302 46394 int pred = sl->curr_pic_num;
303
304
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 59145 for (int index = 0; index < sl->nb_ref_modifications[list]; index++) {
305 12751 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
306 12751 unsigned int val = sl->ref_modifications[list][index].val;
307 unsigned int pic_id;
308 int i, pic_structure;
309 12751 H264Picture *ref = NULL;
310
311
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 12751 switch (modification_of_pic_nums_idc) {
312 12188 case 0:
313 case 1: {
314 12188 const unsigned int abs_diff_pic_num = val + 1;
315 int frame_num;
316
317
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 12188 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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 12188 if (modification_of_pic_nums_idc == 0)
324 9889 pred -= abs_diff_pic_num;
325 else
326 2299 pred += abs_diff_pic_num;
327 12188 pred &= sl->max_pic_num - 1;
328
329 12188 frame_num = pic_num_extract(h, pred, &pic_structure);
330
331
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 39971 for (i = h->short_ref_count - 1; i >= 0; i--) {
332 39971 ref = h->short_ref[i];
333 assert(ref->reference);
334 assert(!ref->long_ref);
335
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 39971 if (ref->frame_num == frame_num &&
336
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 12188 (ref->reference & pic_structure))
337 12188 break;
338 }
339
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 12188 if (i >= 0)
340 12188 ref->pic_id = pred;
341 12188 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)) {
357 563 ref->pic_id = pic_id;
358 assert(ref->long_ref);
359 563 i = 0;
360 } else {
361 ✗ i = -1;
362 }
363 563 break;
364 }
365 ✗ default:
366 ✗ av_assert0(0);
367 }
368
369
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 12751 if (i < 0 || mismatches_ref(h, ref)) {
370 ✗ av_log(h->avctx, AV_LOG_ERROR,
371 i < 0 ? "reference picture missing during reorder\n" :
372 "mismatching reference\n"
373 );
374 ✗ memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
375 } else {
376
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 24810 for (i = index; i + 1 < sl->ref_count[list]; i++) {
377
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 19438 if (sl->ref_list[list][i].parent &&
378
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 17757 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
379
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 15818 ref->pic_id == sl->ref_list[list][i].pic_id)
380 7379 break;
381 }
382
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 24810 for (; i > index; i--) {
383 12059 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
384 }
385 12751 ref_from_h264pic(&sl->ref_list[list][index], ref);
386
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 12751 if (FIELD_PICTURE(h)) {
387 1615 pic_as_field(&sl->ref_list[list][index], pic_structure);
388 }
389 }
390 }
391 }
392
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 83976 for (int list = 0; list < sl->list_count; list++) {
393
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 187756 for (int index = 0; index < sl->ref_count[list]; index++) {
394
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 141362 if ( !sl->ref_list[list][index].parent
395
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 141347 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
396 15 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
397
398
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 255 for (int i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
399 240 h->last_pocs[i] = INT_MIN;
400
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 15 if (h->default_ref[list].parent
401
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 15 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
402 15 sl->ref_list[list][index] = h->default_ref[list];
403 else
404 ✗ return -1;
405 }
406
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 141362 if (h->noref_gray>0 && sl->ref_list[list][index].parent->gray && h->non_gray) {
407
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 84 for (int j=0; j<sl->list_count; j++) {
408 84 int list2 = (list+j)&1;
409
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 84 if (h->default_ref[list2].parent && !h->default_ref[list2].parent->gray
410
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 42 && !(!FIELD_PICTURE(h) && (h->default_ref[list2].reference&3) != 3)) {
411 42 sl->ref_list[list][index] = h->default_ref[list2];
412 42 av_log(h->avctx, AV_LOG_DEBUG, "replacement of gray gap frame\n");
413 42 break;
414 }
415 }
416 }
417
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 141362 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
418 }
419 }
420
421
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 37582 if (FRAME_MBAFF(h))
422 4975 h264_fill_mbaff_ref_list(sl);
423
424 37582 return 0;
425 }
426
427 33184 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
428 {
429 33184 sl->nb_ref_modifications[0] = 0;
430 33184 sl->nb_ref_modifications[1] = 0;
431
432
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 79702 for (int list = 0; list < sl->list_count; list++) {
433
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 46518 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
434 42857 continue;
435
436 3661 for (int index = 0; ; index++) {
437 16484 unsigned int op = get_ue_golomb_31(&sl->gb);
438
439
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 16484 if (op == 3)
440 3661 break;
441
442
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 12823 if (index >= sl->ref_count[list]) {
443 ✗ av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
444 ✗ return AVERROR_INVALIDDATA;
445
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 12823 } else if (op > 2) {
446 ✗ av_log(logctx, AV_LOG_ERROR,
447 "illegal modification_of_pic_nums_idc %u\n",
448 op);
449 ✗ return AVERROR_INVALIDDATA;
450 }
451 12823 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
452 12823 sl->ref_modifications[list][index].op = op;
453 12823 sl->nb_ref_modifications[list]++;
454 }
455 }
456
457 33184 return 0;
458 }
459
460 /**
461 * Mark a picture as no longer needed for reference. The refmask
462 * argument allows unreferencing of individual fields or the whole frame.
463 * If the picture becomes entirely unreferenced, but is being held for
464 * display purposes, it is marked as such.
465 * @param refmask mask of fields to unreference; the mask is bitwise
466 * anded with the reference marking of pic
467 * @return non-zero if pic becomes entirely unreferenced (except possibly
468 * for display purposes) zero if one of the fields remains in
469 * reference
470 */
471 19030 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
472 {
473
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 19030 if (pic->reference &= refmask) {
474 1226 return 0;
475 } else {
476
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 35733 for (int i = 0; h->delayed_pic[i]; i++)
477
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 19408 if(pic == h->delayed_pic[i]){
478 1479 pic->reference = DELAYED_PIC_REF;
479 1479 break;
480 }
481 17804 return 1;
482 }
483 }
484
485 /**
486 * Find a H264Picture in the short term reference list by frame number.
487 * @param frame_num frame number to search for
488 * @param idx the index into h->short_ref where returned picture is found
489 * undefined if no picture found.
490 * @return pointer to the found picture, or NULL if no pic with the provided
491 * frame number is found
492 */
493 50312 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
494 {
495
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 213233 for (int i = 0; i < h->short_ref_count; i++) {
496 195455 H264Picture *pic = h->short_ref[i];
497
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 195455 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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 195455 if (pic->frame_num == frame_num) {
500 32534 *idx = i;
501 32534 return pic;
502 }
503 }
504 17778 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 15240 static void remove_short_at_index(H264Context *h, int i)
514 {
515 assert(i >= 0 && i < h->short_ref_count);
516 15240 h->short_ref[i] = NULL;
517
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 15240 if (--h->short_ref_count)
518 11714 memmove(&h->short_ref[i], &h->short_ref[i + 1],
519 11714 (h->short_ref_count - i) * sizeof(H264Picture*));
520 15240 }
521
522 /**
523 * @return the removed picture or NULL if an error occurs
524 */
525 33880 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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 33880 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 33880 pic = find_short(h, frame_num, &i);
534
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 33880 if (pic) {
535
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 16145 if (unreference_pic(h, pic, ref_mask))
536 14919 remove_short_at_index(h, i);
537 }
538
539 33880 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 44367 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
548 {
549 H264Picture *pic;
550
551 44367 pic = h->long_ref[i];
552
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 44367 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 44367 return pic;
562 }
563
564 2352 void ff_h264_remove_all_refs(H264Context *h)
565 {
566
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 39984 for (int i = 0; i < 16; i++)
567 37632 remove_long(h, i, 0);
568 assert(h->long_ref_count == 0);
569
570
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 2352 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
571 1134 ff_h264_unref_picture(&h->last_pic_for_ec);
572 1134 ff_h264_ref_picture(&h->last_pic_for_ec, h->short_ref[0]);
573 }
574
575
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 4895 for (int i = 0; i < h->short_ref_count; i++) {
576 2543 unreference_pic(h, h->short_ref[i], 0);
577 2543 h->short_ref[i] = NULL;
578 }
579 2352 h->short_ref_count = 0;
580
581 2352 memset(h->default_ref, 0, sizeof(h->default_ref));
582 2352 }
583
584 16601 static void generate_sliding_window_mmcos(H264Context *h)
585 {
586 16601 MMCO *mmco = h->mmco;
587 16601 int nb_mmco = 0;
588
589
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 16601 if (h->short_ref_count &&
590
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 16567 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
591
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 14002 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
592 12804 mmco[0].opcode = MMCO_SHORT2UNUSED;
593 12804 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
594 12804 nb_mmco = 1;
595
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 12804 if (FIELD_PICTURE(h)) {
596 1045 mmco[0].short_pic_num *= 2;
597 1045 mmco[1].opcode = MMCO_SHORT2UNUSED;
598 1045 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
599 1045 nb_mmco = 2;
600 }
601 }
602
603 16601 h->nb_mmco = nb_mmco;
604 16601 }
605
606 19284 int ff_h264_execute_ref_pic_marking(H264Context *h)
607 {
608 19284 MMCO *mmco = h->mmco;
609 int mmco_count;
610 19284 int pps_ref_count[2] = {0};
611 19284 int current_ref_assigned = 0, err = 0;
612
613
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 19284 if (!h->ps.sps) {
614 ✗ av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
615 ✗ err = AVERROR_INVALIDDATA;
616 ✗ goto out;
617 }
618
619
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 19284 if (!h->explicit_ref_marking)
620 16601 generate_sliding_window_mmcos(h);
621 19284 mmco_count = h->nb_mmco;
622
623
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 19284 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
624 ✗ av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
625
626
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 36241 for (int i = 0; i < mmco_count; i++) {
627
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 16957 if (h->avctx->debug & FF_DEBUG_MMCO)
628 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
629 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
630
631
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 16957 switch (mmco[i].opcode) {
632 16432 case MMCO_SHORT2UNUSED:
633 case MMCO_SHORT2LONG: {
634 int structure, j;
635 16432 int frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
636 16432 H264Picture *pic = find_short(h, frame_num, &j);
637
638
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 16432 if (!pic) {
639
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 43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
640
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 21 !h->long_ref[mmco[i].long_arg] ||
641
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 21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
642
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 22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
643 22 err = AVERROR_INVALIDDATA;
644 }
645 43 continue;
646 }
647
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 16389 if (mmco[i].opcode == MMCO_SHORT2UNUSED) {
648
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 16068 if (h->avctx->debug & FF_DEBUG_MMCO)
649 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
650 h->mmco[i].short_pic_num, h->short_ref_count);
651 16068 remove_short(h, frame_num, structure ^ PICT_FRAME);
652 } else {
653
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 321 if (h->long_ref[mmco[i].long_arg] != pic)
654 321 remove_long(h, mmco[i].long_arg, 0);
655
656 321 remove_short_at_index(h, j);
657 321 h->long_ref[ mmco[i].long_arg ] = pic;
658
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 321 if (h->long_ref[mmco[i].long_arg]) {
659 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
660 321 h->long_ref_count++;
661 }
662 }
663 16389 break;
664 }
665 82 case MMCO_LONG2UNUSED: {
666 82 int structure, j = pic_num_extract(h, mmco[i].long_arg, &structure);
667 82 H264Picture *pic = h->long_ref[j];
668
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 82 if (pic) {
669 82 remove_long(h, j, structure ^ PICT_FRAME);
670 ✗ } else if (h->avctx->debug & FF_DEBUG_MMCO)
671 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
672 82 break;
673 }
674 21 case MMCO_LONG:
675 // Comment below left from previous code as it is an interesting note.
676 /* First field in pair is in short term list or
677 * at a different long term index.
678 * This is not allowed; see 7.4.3.3, notes 2 and 3.
679 * Report the problem and keep the pair where it is,
680 * and mark this field valid.
681 */
682
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 21 if (h->short_ref[0] == h->cur_pic_ptr) {
683 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
684 ✗ remove_short_at_index(h, 0);
685 }
686
687 /* make sure the current picture is not already assigned as a long ref */
688
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 21 if (h->cur_pic_ptr->long_ref) {
689 ✗ for (int j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
690 ✗ if (h->long_ref[j] == h->cur_pic_ptr) {
691 ✗ if (j != mmco[i].long_arg)
692 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
693 ✗ remove_long(h, j, 0);
694 }
695 }
696 }
697
698
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 21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
699
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 21 av_assert0(!h->cur_pic_ptr->long_ref);
700 21 remove_long(h, mmco[i].long_arg, 0);
701
702 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
703 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
704 21 h->long_ref_count++;
705 }
706
707 21 h->cur_pic_ptr->reference |= h->picture_structure;
708 21 current_ref_assigned = 1;
709 21 break;
710 407 case MMCO_SET_MAX_LONG:
711 assert(mmco[i].long_arg <= 16);
712 // just remove the long term which index is greater than new max
713
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 6478 for (int j = mmco[i].long_arg; j < 16; j++)
714 6071 remove_long(h, j, 0);
715 407 break;
716 15 case MMCO_RESET:
717
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 68 while (h->short_ref_count) {
718 53 remove_short(h, h->short_ref[0]->frame_num, 0);
719 }
720
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 255 for (int j = 0; j < 16; j++)
721 240 remove_long(h, j, 0);
722 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
723 15 h->mmco_reset = 1;
724 15 h->cur_pic_ptr->mmco_reset = 1;
725
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 255 for (int j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++)
726 240 h->last_pocs[j] = INT_MIN;
727 15 break;
728 ✗ default: av_assert0(0);
729 }
730 }
731
732
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 19284 if (!current_ref_assigned) {
733 /* Second field of complementary field pair; the first field of
734 * which is already referenced. If short referenced, it
735 * should be first entry in short_ref. If not, it must exist
736 * in long_ref; trying to put it on the short list here is an
737 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
738 */
739
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 19263 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
740 /* Just mark the second field valid */
741 1528 h->cur_pic_ptr->reference |= h->picture_structure;
742
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 17735 } else if (h->cur_pic_ptr->long_ref) {
743 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
744 "assignment for second field "
745 "in complementary field pair "
746 "(first field is long term)\n");
747 ✗ err = AVERROR_INVALIDDATA;
748 } else {
749 17735 H264Picture *pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
750
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 17735 if (pic) {
751 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
752 ✗ err = AVERROR_INVALIDDATA;
753 }
754
755
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 17735 if (h->short_ref_count)
756 13091 memmove(&h->short_ref[1], &h->short_ref[0],
757 13091 h->short_ref_count * sizeof(H264Picture*));
758
759 17735 h->short_ref[0] = h->cur_pic_ptr;
760 17735 h->short_ref_count++;
761 17735 h->cur_pic_ptr->reference |= h->picture_structure;
762 }
763 }
764
765
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 19284 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
766
767 /* We have too many reference frames, probably due to corrupted
768 * stream. Need to discard one frame. Prevents overrun of the
769 * short_ref and long_ref buffers.
770 */
771 11 av_log(h->avctx, AV_LOG_ERROR,
772 "number of reference frames (%d+%d) exceeds max (%d; probably "
773 "corrupt input), discarding one\n",
774 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
775 11 err = AVERROR_INVALIDDATA;
776
777
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 11 if (h->long_ref_count && !h->short_ref_count) {
778 int i;
779 ✗ for (i = 0; i < 16; ++i)
780 ✗ if (h->long_ref[i])
781 ✗ break;
782
783 assert(i < 16);
784 ✗ remove_long(h, i, 0);
785 } else {
786 11 H264Picture *pic = h->short_ref[h->short_ref_count - 1];
787 11 remove_short(h, pic->frame_num, 0);
788 }
789 }
790
791
2/2
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 100360 for (int i = 0; i < h->short_ref_count; i++) {
792 81076 H264Picture *pic = h->short_ref[i];
793
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 81076 if (pic->invalid_gap) {
794 347 int d = av_zero_extend(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
795
2/2
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 347 if (d > h->ps.sps->ref_frame_count)
796 13 remove_short(h, pic->frame_num, 0);
797 }
798 }
799
800 19284 print_short_term(h);
801 19284 print_long_term(h);
802
803
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 4955988 for (int i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
804
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 4936704 if (h->ps.pps_list[i]) {
805 19648 const PPS *pps = h->ps.pps_list[i];
806 19648 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
807 19648 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
808 }
809 }
810
811 // Detect unmarked random access points
812
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 19284 if ( err >= 0
813
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 19273 && h->long_ref_count==0
814
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 18228 && ( h->short_ref_count<=2
815
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 10161 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
816
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 9257 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
817
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 9676 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
818
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 8466 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
819 2274 h->cur_pic_ptr->recovered |= FRAME_RECOVERED_HEURISTIC;
820
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 2274 if(!h->avctx->has_b_frames)
821 1533 h->frame_recovered |= FRAME_RECOVERED_HEURISTIC;
822 }
823
824 17751 out:
825
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 19284 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
826 }
827
828 25168 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
829 const H2645NAL *nal, void *logctx)
830 {
831 25168 MMCO *mmco = sl->mmco;
832 25168 int nb_mmco = 0;
833
834
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 25168 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
835 2270 skip_bits1(gb); // broken_link
836
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 2270 if (get_bits1(gb)) {
837 3 mmco[0].opcode = MMCO_LONG;
838 3 mmco[0].long_arg = 0;
839 3 nb_mmco = 1;
840 }
841 2270 sl->explicit_ref_marking = 1;
842 } else {
843 22898 sl->explicit_ref_marking = get_bits1(gb);
844
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 22898 if (sl->explicit_ref_marking) {
845 int i;
846
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 6944 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
847 6944 MMCOOpcode opcode = get_ue_golomb_31(gb);
848
849 6944 mmco[i].opcode = opcode;
850
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 6944 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
851 4049 mmco[i].short_pic_num =
852 4049 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
853 4049 (sl->max_pic_num - 1);
854 }
855
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 6944 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
856
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 6479 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
857 875 unsigned int long_arg = get_ue_golomb_31(gb);
858
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 875 if (long_arg >= 32 ||
859 ✗ (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
860 ✗ long_arg == 16) &&
861 ✗ !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
862 ✗ av_log(logctx, AV_LOG_ERROR,
863 "illegal long ref in memory management control "
864 "operation %d\n", opcode);
865 ✗ sl->nb_mmco = i;
866 ✗ return -1;
867 }
868 875 mmco[i].long_arg = long_arg;
869 }
870
871
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 6944 if (opcode > (unsigned) MMCO_LONG) {
872 ✗ av_log(logctx, AV_LOG_ERROR,
873 "illegal memory management control operation %d\n",
874 opcode);
875 ✗ sl->nb_mmco = i;
876 ✗ return -1;
877 }
878
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 6944 if (opcode == MMCO_END)
879 2370 break;
880 }
881 2370 nb_mmco = i;
882 }
883 }
884
885 25168 sl->nb_mmco = nb_mmco;
886
887 25168 return 0;
888 }
889