FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 422 484 87.2%
Functions: 22 22 100.0%
Branches: 317 412 76.9%

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 62803 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41 int i;
42
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251212 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
43
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188409 if (parity == PICT_BOTTOM_FIELD)
44 90207 pic->data[i] += pic->linesize[i];
45 188409 pic->reference = parity;
46 188409 pic->linesize[i] *= 2;
47 }
48 62803 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
49 62803 }
50
51 210249 static void ref_from_h264pic(H264Ref *dst, const H264Picture *src)
52 {
53 210249 memcpy(dst->data, src->f->data, sizeof(dst->data));
54 210249 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
55 210249 dst->reference = src->reference;
56 210249 dst->poc = src->poc;
57 210249 dst->pic_id = src->pic_id;
58 210249 dst->parent = src;
59 210249 }
60
61 197758 static int split_field_copy(H264Ref *dest, const H264Picture *src,
62 int parity, int id_add)
63 {
64 197758 int match = !!(src->reference & parity);
65
66
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197758 if (match) {
67 197758 ref_from_h264pic(dest, src);
68
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197758 if (parity != PICT_FRAME) {
69 61448 pic_as_field(dest, parity);
70 61448 dest->pic_id *= 2;
71 61448 dest->pic_id += id_add;
72 }
73 }
74
75 197758 return match;
76 }
77
78 100934 static int build_def_list(H264Ref *def, int def_len,
79 H264Picture * const *in, int len, int is_long, int sel)
80 {
81 100934 int i[2] = { 0 };
82 100934 int index = 0;
83
84
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420602 while (i[0] < len || i[1] < len) {
85
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1026562 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
86 807828 i[0]++;
87
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1160614 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
88 941880 i[1]++;
89
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218734 if (i[0] < len) {
90
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165905 av_assert0(index < def_len);
91
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165905 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
92 165905 split_field_copy(&def[index++], in[i[0]++], sel, 1);
93 }
94
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218734 if (i[1] < len) {
95
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31853 av_assert0(index < def_len);
96
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31853 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
97 31853 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
98 }
99 }
100
101 100934 return index;
102 }
103
104 52420 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
105 int len, int limit, int dir)
106 {
107 int i, best_poc;
108 52420 int out_i = 0;
109
110 for (;;) {
111
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131330 best_poc = dir ? INT_MIN : INT_MAX;
112
113
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657204 for (i = 0; i < len; i++) {
114 525874 const int poc = src[i]->poc;
115
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525874 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
116 91002 best_poc = poc;
117 91002 sorted[out_i] = src[i];
118 }
119 }
120
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131330 if (best_poc == (dir ? INT_MIN : INT_MAX))
121 52420 break;
122 78910 limit = sorted[out_i++]->poc - dir;
123 }
124 52420 return out_i;
125 }
126
127 151375 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
128 {
129 151375 const AVFrame *f = pic->f;
130 302750 return (h->cur_pic_ptr->f->width != f->width ||
131
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302750 h->cur_pic_ptr->f->height != f->height ||
132
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151375 h->cur_pic_ptr->f->format != f->format);
133 }
134
135 37362 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
136 {
137 int i, len;
138 int j;
139
140
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37362 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
141 H264Picture *sorted[32];
142 int cur_poc, list;
143 int lens[2];
144
145
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13105 if (FIELD_PICTURE(h))
146 4809 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
147 else
148 8296 cur_poc = h->cur_pic_ptr->poc;
149
150
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39315 for (list = 0; list < 2; list++) {
151 26210 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
152 26210 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
153
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26210 av_assert0(len <= 32);
154
155 26210 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
156 sorted, len, 0, h->picture_structure);
157 52420 len += build_def_list(sl->ref_list[list] + len,
158 26210 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
159 26210 h->long_ref, 16, 1, h->picture_structure);
160
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26210 av_assert0(len <= 32);
161
162
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26210 if (len < sl->ref_count[list])
163 5 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
164 26210 lens[list] = len;
165 }
166
167
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13105 if (lens[0] == lens[1] && lens[1] > 1) {
168
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15565 for (i = 0; i < lens[0] &&
169 13631 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
170
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13631 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
171
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11586 if (i == lens[0]) {
172 1934 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
173 }
174 }
175 } else {
176 24257 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
177 24257 h->short_ref, h->short_ref_count, 0, h->picture_structure);
178 48514 len += build_def_list(sl->ref_list[0] + len,
179 24257 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
180 24257 h-> long_ref, 16, 1, h->picture_structure);
181
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24257 av_assert0(len <= 32);
182
183
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24257 if (len < sl->ref_count[0])
184 904 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
185 }
186 #ifdef TRACE
187 for (i = 0; i < sl->ref_count[0]; i++) {
188 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
189 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
190 sl->ref_list[0][i].pic_id,
191 sl->ref_list[0][i].data[0]);
192 }
193 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
194 for (i = 0; i < sl->ref_count[1]; i++) {
195 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
196 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
197 sl->ref_list[1][i].pic_id,
198 sl->ref_list[1][i].data[0]);
199 }
200 }
201 #endif
202
203
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87829 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
204
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190951 for (i = 0; i < sl->ref_count[j]; i++) {
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140484 if (sl->ref_list[j][i].parent) {
206
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138884 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
207 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
208 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
209 }
210 }
211 }
212 }
213
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83363 for (i = 0; i < sl->list_count; i++)
214 46001 h->default_ref[i] = sl->ref_list[i][0];
215 37362 }
216
217 /**
218 * print short term list
219 */
220 56532 static void print_short_term(const H264Context *h)
221 {
222 uint32_t i;
223
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56532 if (h->avctx->debug & FF_DEBUG_MMCO) {
224 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
225 for (i = 0; i < h->short_ref_count; i++) {
226 H264Picture *pic = h->short_ref[i];
227 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
228 i, pic->frame_num, pic->poc, pic->f->data[0]);
229 }
230 }
231 56532 }
232
233 /**
234 * print long term list
235 */
236 56532 static void print_long_term(const H264Context *h)
237 {
238 uint32_t i;
239
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56532 if (h->avctx->debug & FF_DEBUG_MMCO) {
240 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
241 for (i = 0; i < 16; i++) {
242 H264Picture *pic = h->long_ref[i];
243 if (pic) {
244 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
245 i, pic->frame_num, pic->poc, pic->f->data[0]);
246 }
247 }
248 }
249 56532 }
250
251 /**
252 * Extract structure information about the picture described by pic_num in
253 * the current decoding context (frame or field). Note that pic_num is
254 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
255 * @param pic_num picture number for which to extract structure information
256 * @param structure one of PICT_XXX describing structure of picture
257 * with pic_num
258 * @return frame number (short term) or long term index of picture
259 * described by pic_num
260 */
261 28918 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
262 {
263 28918 *structure = h->picture_structure;
264
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28918 if (FIELD_PICTURE(h)) {
265
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3783 if (!(pic_num & 1))
266 /* opposite field */
267 2004 *structure ^= PICT_FRAME;
268 3783 pic_num >>= 1;
269 }
270
271 28918 return pic_num;
272 }
273
274 4971 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
275 {
276 int list, i, j;
277
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11638 for (list = 0; list < sl->list_count; list++) {
278
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22699 for (i = 0; i < sl->ref_count[list]; i++) {
279 16032 const H264Ref *frame = &sl->ref_list[list][i];
280 16032 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
281
282 16032 field[0] = *frame;
283
284
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64128 for (j = 0; j < 3; j++)
285 48096 field[0].linesize[j] <<= 1;
286 16032 field[0].reference = PICT_TOP_FIELD;
287 16032 field[0].poc = field[0].parent->field_poc[0];
288
289 16032 field[1] = field[0];
290
291
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64128 for (j = 0; j < 3; j++)
292 48096 field[1].data[j] += frame->parent->f->linesize[j];
293 16032 field[1].reference = PICT_BOTTOM_FIELD;
294 16032 field[1].poc = field[1].parent->field_poc[1];
295 }
296 }
297 4971 }
298
299 37362 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
300 {
301 int list, index, pic_structure;
302
303 37362 print_short_term(h);
304 37362 print_long_term(h);
305
306 37362 h264_initialise_ref_list(h, sl);
307
308
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83363 for (list = 0; list < sl->list_count; list++) {
309 46001 int pred = sl->curr_pic_num;
310
311
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58492 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
312 12491 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
313 12491 unsigned int val = sl->ref_modifications[list][index].val;
314 unsigned int pic_id;
315 int i;
316 12491 H264Picture *ref = NULL;
317
318
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12491 switch (modification_of_pic_nums_idc) {
319 11928 case 0:
320 case 1: {
321 11928 const unsigned int abs_diff_pic_num = val + 1;
322 int frame_num;
323
324
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11928 if (abs_diff_pic_num > sl->max_pic_num) {
325 av_log(h->avctx, AV_LOG_ERROR,
326 "abs_diff_pic_num overflow\n");
327 return AVERROR_INVALIDDATA;
328 }
329
330
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11928 if (modification_of_pic_nums_idc == 0)
331 9739 pred -= abs_diff_pic_num;
332 else
333 2189 pred += abs_diff_pic_num;
334 11928 pred &= sl->max_pic_num - 1;
335
336 11928 frame_num = pic_num_extract(h, pred, &pic_structure);
337
338
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38703 for (i = h->short_ref_count - 1; i >= 0; i--) {
339 38703 ref = h->short_ref[i];
340 assert(ref->reference);
341 assert(!ref->long_ref);
342
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38703 if (ref->frame_num == frame_num &&
343
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11928 (ref->reference & pic_structure))
344 11928 break;
345 }
346
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11928 if (i >= 0)
347 11928 ref->pic_id = pred;
348 11928 break;
349 }
350 563 case 2: {
351 int long_idx;
352 563 pic_id = val; // long_term_pic_idx
353
354 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
355
356
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563 if (long_idx > 31U) {
357 av_log(h->avctx, AV_LOG_ERROR,
358 "long_term_pic_idx overflow\n");
359 return AVERROR_INVALIDDATA;
360 }
361 563 ref = h->long_ref[long_idx];
362 assert(!(ref && !ref->reference));
363
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563 if (ref && (ref->reference & pic_structure)) {
364 563 ref->pic_id = pic_id;
365 assert(ref->long_ref);
366 563 i = 0;
367 } else {
368 i = -1;
369 }
370 563 break;
371 }
372 default:
373 av_assert0(0);
374 }
375
376
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12491 if (i < 0 || mismatches_ref(h, ref)) {
377 av_log(h->avctx, AV_LOG_ERROR,
378 i < 0 ? "reference picture missing during reorder\n" :
379 "mismatching reference\n"
380 );
381 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
382 } else {
383
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24424 for (i = index; i + 1 < sl->ref_count[list]; i++) {
384
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19200 if (sl->ref_list[list][i].parent &&
385
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17519 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
386
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15580 ref->pic_id == sl->ref_list[list][i].pic_id)
387 7267 break;
388 }
389
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24424 for (; i > index; i--) {
390 11933 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
391 }
392 12491 ref_from_h264pic(&sl->ref_list[list][index], ref);
393
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12491 if (FIELD_PICTURE(h)) {
394 1355 pic_as_field(&sl->ref_list[list][index], pic_structure);
395 }
396 }
397 }
398 }
399
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83363 for (list = 0; list < sl->list_count; list++) {
400
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186485 for (index = 0; index < sl->ref_count[list]; index++) {
401
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140484 if ( !sl->ref_list[list][index].parent
402
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140469 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
403 int i;
404 15 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
405
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255 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
406 240 h->last_pocs[i] = INT_MIN;
407
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15 if (h->default_ref[list].parent
408
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15 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
409 15 sl->ref_list[list][index] = h->default_ref[list];
410 else
411 return -1;
412 }
413
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140484 if (h->noref_gray>0 && sl->ref_list[list][index].parent->gray && h->non_gray) {
414
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84 for (int j=0; j<sl->list_count; j++) {
415 84 int list2 = (list+j)&1;
416
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84 if (h->default_ref[list2].parent && !h->default_ref[list2].parent->gray
417
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42 && !(!FIELD_PICTURE(h) && (h->default_ref[list2].reference&3) != 3)) {
418 42 sl->ref_list[list][index] = h->default_ref[list2];
419 42 av_log(h, AV_LOG_DEBUG, "replacement of gray gap frame\n");
420 42 break;
421 }
422 }
423 }
424
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140484 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
425 }
426 }
427
428
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37362 if (FRAME_MBAFF(h))
429 4971 h264_fill_mbaff_ref_list(sl);
430
431 37362 return 0;
432 }
433
434 32976 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
435 {
436 int list, index;
437
438 32976 sl->nb_ref_modifications[0] = 0;
439 32976 sl->nb_ref_modifications[1] = 0;
440
441
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79101 for (list = 0; list < sl->list_count; list++) {
442
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46125 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
443 42570 continue;
444
445 3555 for (index = 0; ; index++) {
446 16118 unsigned int op = get_ue_golomb_31(&sl->gb);
447
448
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16118 if (op == 3)
449 3555 break;
450
451
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12563 if (index >= sl->ref_count[list]) {
452 av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
453 return AVERROR_INVALIDDATA;
454
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12563 } else if (op > 2) {
455 av_log(logctx, AV_LOG_ERROR,
456 "illegal modification_of_pic_nums_idc %u\n",
457 op);
458 return AVERROR_INVALIDDATA;
459 }
460 12563 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
461 12563 sl->ref_modifications[list][index].op = op;
462 12563 sl->nb_ref_modifications[list]++;
463 }
464 }
465
466 32976 return 0;
467 }
468
469 /**
470 * Mark a picture as no longer needed for reference. The refmask
471 * argument allows unreferencing of individual fields or the whole frame.
472 * If the picture becomes entirely unreferenced, but is being held for
473 * display purposes, it is marked as such.
474 * @param refmask mask of fields to unreference; the mask is bitwise
475 * anded with the reference marking of pic
476 * @return non-zero if pic becomes entirely unreferenced (except possibly
477 * for display purposes) zero if one of the fields remains in
478 * reference
479 */
480 18925 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
481 {
482 int i;
483
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18925 if (pic->reference &= refmask) {
484 1182 return 0;
485 } else {
486
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35536 for(i = 0; h->delayed_pic[i]; i++)
487
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19234 if(pic == h->delayed_pic[i]){
488 1441 pic->reference = DELAYED_PIC_REF;
489 1441 break;
490 }
491 17743 return 1;
492 }
493 }
494
495 /**
496 * Find a H264Picture in the short term reference list by frame number.
497 * @param frame_num frame number to search for
498 * @param idx the index into h->short_ref where returned picture is found
499 * undefined if no picture found.
500 * @return pointer to the found picture, or NULL if no pic with the provided
501 * frame number is found
502 */
503 50077 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
504 {
505 int i;
506
507
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212576 for (i = 0; i < h->short_ref_count; i++) {
508 194859 H264Picture *pic = h->short_ref[i];
509
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194859 if (h->avctx->debug & FF_DEBUG_MMCO)
510 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
511
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194859 if (pic->frame_num == frame_num) {
512 32360 *idx = i;
513 32360 return pic;
514 }
515 }
516 17717 return NULL;
517 }
518
519 /**
520 * Remove a picture from the short term reference list by its index in
521 * that list. This does no checking on the provided index; it is assumed
522 * to be valid. Other list entries are shifted down.
523 * @param i index into h->short_ref of picture to remove.
524 */
525 15197 static void remove_short_at_index(H264Context *h, int i)
526 {
527 assert(i >= 0 && i < h->short_ref_count);
528 15197 h->short_ref[i] = NULL;
529
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15197 if (--h->short_ref_count)
530 11671 memmove(&h->short_ref[i], &h->short_ref[i + 1],
531 11671 (h->short_ref_count - i) * sizeof(H264Picture*));
532 15197 }
533
534 /**
535 * @return the removed picture or NULL if an error occurs
536 */
537 33732 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
538 {
539 H264Picture *pic;
540 int i;
541
542
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33732 if (h->avctx->debug & FF_DEBUG_MMCO)
543 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
544
545 33732 pic = find_short(h, frame_num, &i);
546
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33732 if (pic) {
547
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16058 if (unreference_pic(h, pic, ref_mask))
548 14876 remove_short_at_index(h, i);
549 }
550
551 33732 return pic;
552 }
553
554 /**
555 * Remove a picture from the long term reference list by its index in
556 * that list.
557 * @return the removed picture or NULL if an error occurs
558 */
559 43823 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
560 {
561 H264Picture *pic;
562
563 43823 pic = h->long_ref[i];
564
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43823 if (pic) {
565
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342 if (unreference_pic(h, pic, ref_mask)) {
566 assert(h->long_ref[i]->long_ref == 1);
567 342 h->long_ref[i]->long_ref = 0;
568 342 h->long_ref[i] = NULL;
569 342 h->long_ref_count--;
570 }
571 }
572
573 43823 return pic;
574 }
575
576 2318 void ff_h264_remove_all_refs(H264Context *h)
577 {
578 int i;
579
580
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39406 for (i = 0; i < 16; i++) {
581 37088 remove_long(h, i, 0);
582 }
583 assert(h->long_ref_count == 0);
584
585
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2318 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
586 1124 ff_h264_unref_picture(&h->last_pic_for_ec);
587 1124 ff_h264_ref_picture(&h->last_pic_for_ec, h->short_ref[0]);
588 }
589
590
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4843 for (i = 0; i < h->short_ref_count; i++) {
591 2525 unreference_pic(h, h->short_ref[i], 0);
592 2525 h->short_ref[i] = NULL;
593 }
594 2318 h->short_ref_count = 0;
595
596 2318 memset(h->default_ref, 0, sizeof(h->default_ref));
597 2318 }
598
599 16522 static void generate_sliding_window_mmcos(H264Context *h)
600 {
601 16522 MMCO *mmco = h->mmco;
602 16522 int nb_mmco = 0;
603
604
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16522 if (h->short_ref_count &&
605
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16488 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
606
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13983 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
607 12804 mmco[0].opcode = MMCO_SHORT2UNUSED;
608 12804 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
609 12804 nb_mmco = 1;
610
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12804 if (FIELD_PICTURE(h)) {
611 1044 mmco[0].short_pic_num *= 2;
612 1044 mmco[1].opcode = MMCO_SHORT2UNUSED;
613 1044 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
614 1044 nb_mmco = 2;
615 }
616 }
617
618 16522 h->nb_mmco = nb_mmco;
619 16522 }
620
621 19170 int ff_h264_execute_ref_pic_marking(H264Context *h)
622 {
623 19170 MMCO *mmco = h->mmco;
624 int mmco_count;
625 19170 int i, av_uninit(j);
626 19170 int pps_ref_count[2] = {0};
627 19170 int current_ref_assigned = 0, err = 0;
628 19170 H264Picture *av_uninit(pic);
629
630
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19170 if (!h->ps.sps) {
631 av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
632 err = AVERROR_INVALIDDATA;
633 goto out;
634 }
635
636
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19170 if (!h->explicit_ref_marking)
637 16522 generate_sliding_window_mmcos(h);
638 19170 mmco_count = h->nb_mmco;
639
640
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19170 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
641 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
642
643
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36040 for (i = 0; i < mmco_count; i++) {
644 16870 int av_uninit(structure), av_uninit(frame_num);
645
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16870 if (h->avctx->debug & FF_DEBUG_MMCO)
646 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
647 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
648
649
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16870 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
650
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867 mmco[i].opcode == MMCO_SHORT2LONG) {
651 16345 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
652 16345 pic = find_short(h, frame_num, &j);
653
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16345 if (!pic) {
654
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43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
655
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21 !h->long_ref[mmco[i].long_arg] ||
656
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21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
657
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22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
658 22 err = AVERROR_INVALIDDATA;
659 }
660 43 continue;
661 }
662 }
663
664
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16827 switch (mmco[i].opcode) {
665 15981 case MMCO_SHORT2UNUSED:
666
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15981 if (h->avctx->debug & FF_DEBUG_MMCO)
667 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
668 h->mmco[i].short_pic_num, h->short_ref_count);
669 15981 remove_short(h, frame_num, structure ^ PICT_FRAME);
670 15981 break;
671 321 case MMCO_SHORT2LONG:
672
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321 if (h->long_ref[mmco[i].long_arg] != pic)
673 321 remove_long(h, mmco[i].long_arg, 0);
674
675 321 remove_short_at_index(h, j);
676 321 h->long_ref[ mmco[i].long_arg ] = pic;
677
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321 if (h->long_ref[mmco[i].long_arg]) {
678 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
679 321 h->long_ref_count++;
680 }
681 321 break;
682 82 case MMCO_LONG2UNUSED:
683 82 j = pic_num_extract(h, mmco[i].long_arg, &structure);
684 82 pic = h->long_ref[j];
685
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82 if (pic) {
686 82 remove_long(h, j, structure ^ PICT_FRAME);
687 } else if (h->avctx->debug & FF_DEBUG_MMCO)
688 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
689 82 break;
690 21 case MMCO_LONG:
691 // Comment below left from previous code as it is an interesting note.
692 /* First field in pair is in short term list or
693 * at a different long term index.
694 * This is not allowed; see 7.4.3.3, notes 2 and 3.
695 * Report the problem and keep the pair where it is,
696 * and mark this field valid.
697 */
698
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21 if (h->short_ref[0] == h->cur_pic_ptr) {
699 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
700 remove_short_at_index(h, 0);
701 }
702
703 /* make sure the current picture is not already assigned as a long ref */
704
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21 if (h->cur_pic_ptr->long_ref) {
705 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
706 if (h->long_ref[j] == h->cur_pic_ptr) {
707 if (j != mmco[i].long_arg)
708 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
709 remove_long(h, j, 0);
710 }
711 }
712 }
713
714
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21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
715
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21 av_assert0(!h->cur_pic_ptr->long_ref);
716 21 remove_long(h, mmco[i].long_arg, 0);
717
718 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
719 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
720 21 h->long_ref_count++;
721 }
722
723 21 h->cur_pic_ptr->reference |= h->picture_structure;
724 21 current_ref_assigned = 1;
725 21 break;
726 407 case MMCO_SET_MAX_LONG:
727 assert(mmco[i].long_arg <= 16);
728 // just remove the long term which index is greater than new max
729
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6478 for (j = mmco[i].long_arg; j < 16; j++) {
730 6071 remove_long(h, j, 0);
731 }
732 407 break;
733 15 case MMCO_RESET:
734
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68 while (h->short_ref_count) {
735 53 remove_short(h, h->short_ref[0]->frame_num, 0);
736 }
737
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255 for (j = 0; j < 16; j++) {
738 240 remove_long(h, j, 0);
739 }
740 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
741 15 h->mmco_reset = 1;
742 15 h->cur_pic_ptr->mmco_reset = 1;
743
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255 for (j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++)
744 240 h->last_pocs[j] = INT_MIN;
745 15 break;
746 default: av_assert0(0);
747 }
748 }
749
750
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19170 if (!current_ref_assigned) {
751 /* Second field of complementary field pair; the first field of
752 * which is already referenced. If short referenced, it
753 * should be first entry in short_ref. If not, it must exist
754 * in long_ref; trying to put it on the short list here is an
755 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
756 */
757
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19149 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
758 /* Just mark the second field valid */
759 1475 h->cur_pic_ptr->reference |= h->picture_structure;
760
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17674 } else if (h->cur_pic_ptr->long_ref) {
761 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
762 "assignment for second field "
763 "in complementary field pair "
764 "(first field is long term)\n");
765 err = AVERROR_INVALIDDATA;
766 } else {
767 17674 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
768
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17674 if (pic) {
769 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
770 err = AVERROR_INVALIDDATA;
771 }
772
773
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17674 if (h->short_ref_count)
774 13040 memmove(&h->short_ref[1], &h->short_ref[0],
775 13040 h->short_ref_count * sizeof(H264Picture*));
776
777 17674 h->short_ref[0] = h->cur_pic_ptr;
778 17674 h->short_ref_count++;
779 17674 h->cur_pic_ptr->reference |= h->picture_structure;
780 }
781 }
782
783
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19170 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
784
785 /* We have too many reference frames, probably due to corrupted
786 * stream. Need to discard one frame. Prevents overrun of the
787 * short_ref and long_ref buffers.
788 */
789 11 av_log(h->avctx, AV_LOG_ERROR,
790 "number of reference frames (%d+%d) exceeds max (%d; probably "
791 "corrupt input), discarding one\n",
792 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
793 11 err = AVERROR_INVALIDDATA;
794
795
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11 if (h->long_ref_count && !h->short_ref_count) {
796 for (i = 0; i < 16; ++i)
797 if (h->long_ref[i])
798 break;
799
800 assert(i < 16);
801 remove_long(h, i, 0);
802 } else {
803 11 pic = h->short_ref[h->short_ref_count - 1];
804 11 remove_short(h, pic->frame_num, 0);
805 }
806 }
807
808
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99579 for (i = 0; i<h->short_ref_count; i++) {
809 80409 pic = h->short_ref[i];
810
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80409 if (pic->invalid_gap) {
811 347 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
812
2/2
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347 if (d > h->ps.sps->ref_frame_count)
813 13 remove_short(h, pic->frame_num, 0);
814 }
815 }
816
817 19170 print_short_term(h);
818 19170 print_long_term(h);
819
820
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4926690 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
821
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4907520 if (h->ps.pps_list[i]) {
822 19433 const PPS *pps = h->ps.pps_list[i];
823 19433 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
824 19433 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
825 }
826 }
827
828 // Detect unmarked random access points
829
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19170 if ( err >= 0
830
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19159 && h->long_ref_count==0
831
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18114 && ( h->short_ref_count<=2
832
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10061 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
833
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9157 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
834
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9662 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
835
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8462 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
836 2271 h->cur_pic_ptr->recovered |= FRAME_RECOVERED_HEURISTIC;
837
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2271 if(!h->avctx->has_b_frames)
838 1533 h->frame_recovered |= FRAME_RECOVERED_HEURISTIC;
839 }
840
841 17637 out:
842
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19170 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
843 }
844
845 24953 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
846 const H2645NAL *nal, void *logctx)
847 {
848 int i;
849 24953 MMCO *mmco = sl->mmco;
850 24953 int nb_mmco = 0;
851
852
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24953 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
853 2258 skip_bits1(gb); // broken_link
854
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2258 if (get_bits1(gb)) {
855 3 mmco[0].opcode = MMCO_LONG;
856 3 mmco[0].long_arg = 0;
857 3 nb_mmco = 1;
858 }
859 2258 sl->explicit_ref_marking = 1;
860 } else {
861 22695 sl->explicit_ref_marking = get_bits1(gb);
862
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22695 if (sl->explicit_ref_marking) {
863
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6722 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
864 6722 MMCOOpcode opcode = get_ue_golomb_31(gb);
865
866 6722 mmco[i].opcode = opcode;
867
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6722 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
868 3877 mmco[i].short_pic_num =
869 3877 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
870 3877 (sl->max_pic_num - 1);
871 }
872
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6722 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
873
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6257 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
874 875 unsigned int long_arg = get_ue_golomb_31(gb);
875
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875 if (long_arg >= 32 ||
876 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
877 long_arg == 16) &&
878 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
879 av_log(logctx, AV_LOG_ERROR,
880 "illegal long ref in memory management control "
881 "operation %d\n", opcode);
882 sl->nb_mmco = i;
883 return -1;
884 }
885 875 mmco[i].long_arg = long_arg;
886 }
887
888
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6722 if (opcode > (unsigned) MMCO_LONG) {
889 av_log(logctx, AV_LOG_ERROR,
890 "illegal memory management control operation %d\n",
891 opcode);
892 sl->nb_mmco = i;
893 return -1;
894 }
895
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6722 if (opcode == MMCO_END)
896 2320 break;
897 }
898 2320 nb_mmco = i;
899 }
900 }
901
902 24953 sl->nb_mmco = nb_mmco;
903
904 24953 return 0;
905 }
906