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1/*
2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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#include <string.h>
23
24#include "libavutil/avassert.h"
25#include "libavutil/common.h"
26#include "libavutil/internal.h"
27#include "libavutil/mathematics.h"
28#include "libavutil/mem.h"
29#include "avcodec.h"
30#include "bytestream.h"
31#include "internal.h"
32
33void av_init_packet(AVPacket *pkt)
34{
35 pkt->pts = AV_NOPTS_VALUE;
36 pkt->dts = AV_NOPTS_VALUE;
37 pkt->pos = -1;
38 pkt->duration = 0;
39#if FF_API_CONVERGENCE_DURATION
40FF_DISABLE_DEPRECATION_WARNINGS
41 pkt->convergence_duration = 0;
42FF_ENABLE_DEPRECATION_WARNINGS
43#endif
44 pkt->flags = 0;
45 pkt->stream_index = 0;
46 pkt->buf = NULL;
47 pkt->side_data = NULL;
48 pkt->side_data_elems = 0;
49}
50
51AVPacket *av_packet_alloc(void)
52{
53 AVPacket *pkt = av_mallocz(sizeof(AVPacket));
54 if (!pkt)
55 return pkt;
56
57 av_packet_unref(pkt);
58
59 return pkt;
60}
61
62void av_packet_free(AVPacket **pkt)
63{
64 if (!pkt || !*pkt)
65 return;
66
67 av_packet_unref(*pkt);
68 av_freep(pkt);
69}
70
71static int packet_alloc(AVBufferRef **buf, int size)
72{
73 int ret;
74 if (size < 0 || size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
75 return AVERROR(EINVAL);
76
77 ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);
78 if (ret < 0)
79 return ret;
80
81 memset((*buf)->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
82
83 return 0;
84}
85
86int av_new_packet(AVPacket *pkt, int size)
87{
88 AVBufferRef *buf = NULL;
89 int ret = packet_alloc(&buf, size);
90 if (ret < 0)
91 return ret;
92
93 av_init_packet(pkt);
94 pkt->buf = buf;
95 pkt->data = buf->data;
96 pkt->size = size;
97
98 return 0;
99}
100
101void av_shrink_packet(AVPacket *pkt, int size)
102{
103 if (pkt->size <= size)
104 return;
105 pkt->size = size;
106 memset(pkt->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
107}
108
109int av_grow_packet(AVPacket *pkt, int grow_by)
110{
111 int new_size;
112 av_assert0((unsigned)pkt->size <= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
113 if ((unsigned)grow_by >
114 INT_MAX - (pkt->size + AV_INPUT_BUFFER_PADDING_SIZE))
115 return -1;
116
117 new_size = pkt->size + grow_by + AV_INPUT_BUFFER_PADDING_SIZE;
118 if (pkt->buf) {
119 size_t data_offset;
120 uint8_t *old_data = pkt->data;
121 if (pkt->data == NULL) {
122 data_offset = 0;
123 pkt->data = pkt->buf->data;
124 } else {
125 data_offset = pkt->data - pkt->buf->data;
126 if (data_offset > INT_MAX - new_size)
127 return -1;
128 }
129
130 if (new_size + data_offset > pkt->buf->size) {
131 int ret = av_buffer_realloc(&pkt->buf, new_size + data_offset);
132 if (ret < 0) {
133 pkt->data = old_data;
134 return ret;
135 }
136 pkt->data = pkt->buf->data + data_offset;
137 }
138 } else {
139 pkt->buf = av_buffer_alloc(new_size);
140 if (!pkt->buf)
141 return AVERROR(ENOMEM);
142 if (pkt->size > 0)
143 memcpy(pkt->buf->data, pkt->data, pkt->size);
144 pkt->data = pkt->buf->data;
145 }
146 pkt->size += grow_by;
147 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
148
149 return 0;
150}
151
152int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
153{
154 if (size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
155 return AVERROR(EINVAL);
156
157 pkt->buf = av_buffer_create(data, size + AV_INPUT_BUFFER_PADDING_SIZE,
158 av_buffer_default_free, NULL, 0);
159 if (!pkt->buf)
160 return AVERROR(ENOMEM);
161
162 pkt->data = data;
163 pkt->size = size;
164
165 return 0;
166}
167
168#if FF_API_AVPACKET_OLD_API
169FF_DISABLE_DEPRECATION_WARNINGS
170#define ALLOC_MALLOC(data, size) data = av_malloc(size)
171#define ALLOC_BUF(data, size) \
172do { \
173 av_buffer_realloc(&pkt->buf, size); \
174 data = pkt->buf ? pkt->buf->data : NULL; \
175} while (0)
176
177#define DUP_DATA(dst, src, size, padding, ALLOC) \
178 do { \
179 void *data; \
180 if (padding) { \
181 if ((unsigned)(size) > \
182 (unsigned)(size) + AV_INPUT_BUFFER_PADDING_SIZE) \
183 goto failed_alloc; \
184 ALLOC(data, size + AV_INPUT_BUFFER_PADDING_SIZE); \
185 } else { \
186 ALLOC(data, size); \
187 } \
188 if (!data) \
189 goto failed_alloc; \
190 memcpy(data, src, size); \
191 if (padding) \
192 memset((uint8_t *)data + size, 0, \
193 AV_INPUT_BUFFER_PADDING_SIZE); \
194 dst = data; \
195 } while (0)
196
197/* Makes duplicates of data, side_data, but does not copy any other fields */
198static int copy_packet_data(AVPacket *pkt, const AVPacket *src, int dup)
199{
200 pkt->data = NULL;
201 pkt->side_data = NULL;
202 pkt->side_data_elems = 0;
203 if (pkt->buf) {
204 AVBufferRef *ref = av_buffer_ref(src->buf);
205 if (!ref)
206 return AVERROR(ENOMEM);
207 pkt->buf = ref;
208 pkt->data = ref->data;
209 } else {
210 DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);
211 }
212 if (src->side_data_elems && dup) {
213 pkt->side_data = src->side_data;
214 pkt->side_data_elems = src->side_data_elems;
215 }
216 if (src->side_data_elems && !dup) {
217 return av_copy_packet_side_data(pkt, src);
218 }
219 return 0;
220
221failed_alloc:
222 av_packet_unref(pkt);
223 return AVERROR(ENOMEM);
224}
225
226int av_copy_packet_side_data(AVPacket *pkt, const AVPacket *src)
227{
228 if (src->side_data_elems) {
229 int i;
230 DUP_DATA(pkt->side_data, src->side_data,
231 src->side_data_elems * sizeof(*src->side_data), 0, ALLOC_MALLOC);
232 if (src != pkt) {
233 memset(pkt->side_data, 0,
234 src->side_data_elems * sizeof(*src->side_data));
235 }
236 for (i = 0; i < src->side_data_elems; i++) {
237 DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,
238 src->side_data[i].size, 1, ALLOC_MALLOC);
239 pkt->side_data[i].size = src->side_data[i].size;
240 pkt->side_data[i].type = src->side_data[i].type;
241 }
242 }
243 pkt->side_data_elems = src->side_data_elems;
244 return 0;
245
246failed_alloc:
247 av_packet_unref(pkt);
248 return AVERROR(ENOMEM);
249}
250FF_ENABLE_DEPRECATION_WARNINGS
251#endif
252
253int av_dup_packet(AVPacket *pkt)
254{
255 AVPacket tmp_pkt;
256
257 if (!pkt->buf && pkt->data) {
258 tmp_pkt = *pkt;
259 return copy_packet_data(pkt, &tmp_pkt, 1);
260 }
261 return 0;
262}
263
264int av_copy_packet(AVPacket *dst, const AVPacket *src)
265{
266 *dst = *src;
267 return copy_packet_data(dst, src, 0);
268}
269
270void av_packet_free_side_data(AVPacket *pkt)
271{
272 int i;
273 for (i = 0; i < pkt->side_data_elems; i++)
274 av_freep(&pkt->side_data[i].data);
275 av_freep(&pkt->side_data);
276 pkt->side_data_elems = 0;
277}
278
279#if FF_API_AVPACKET_OLD_API
280FF_DISABLE_DEPRECATION_WARNINGS
281void av_free_packet(AVPacket *pkt)
282{
283 if (pkt) {
284 if (pkt->buf)
285 av_buffer_unref(&pkt->buf);
286 pkt->data = NULL;
287 pkt->size = 0;
288
289 av_packet_free_side_data(pkt);
290 }
291}
292FF_ENABLE_DEPRECATION_WARNINGS
293#endif
294
295int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
296 uint8_t *data, size_t size)
297{
298 AVPacketSideData *tmp;
299 int elems = pkt->side_data_elems;
300
301 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
302 return AVERROR(ERANGE);
303
304 tmp = av_realloc(pkt->side_data, (elems + 1) * sizeof(*tmp));
305 if (!tmp)
306 return AVERROR(ENOMEM);
307
308 pkt->side_data = tmp;
309 pkt->side_data[elems].data = data;
310 pkt->side_data[elems].size = size;
311 pkt->side_data[elems].type = type;
312 pkt->side_data_elems++;
313
314 return 0;
315}
316
317
318uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
319 int size)
320{
321 int ret;
322 uint8_t *data;
323
324 if ((unsigned)size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
325 return NULL;
326 data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
327 if (!data)
328 return NULL;
329
330 ret = av_packet_add_side_data(pkt, type, data, size);
331 if (ret < 0) {
332 av_freep(&data);
333 return NULL;
334 }
335
336 return data;
337}
338
339uint8_t *av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
340 int *size)
341{
342 int i;
343
344 for (i = 0; i < pkt->side_data_elems; i++) {
345 if (pkt->side_data[i].type == type) {
346 if (size)
347 *size = pkt->side_data[i].size;
348 return pkt->side_data[i].data;
349 }
350 }
351 if (size)
352 *size = 0;
353 return NULL;
354}
355
356const char *av_packet_side_data_name(enum AVPacketSideDataType type)
357{
358 switch(type) {
359 case AV_PKT_DATA_PALETTE: return "Palette";
360 case AV_PKT_DATA_NEW_EXTRADATA: return "New Extradata";
361 case AV_PKT_DATA_PARAM_CHANGE: return "Param Change";
362 case AV_PKT_DATA_H263_MB_INFO: return "H263 MB Info";
363 case AV_PKT_DATA_REPLAYGAIN: return "Replay Gain";
364 case AV_PKT_DATA_DISPLAYMATRIX: return "Display Matrix";
365 case AV_PKT_DATA_STEREO3D: return "Stereo 3D";
366 case AV_PKT_DATA_AUDIO_SERVICE_TYPE: return "Audio Service Type";
367 case AV_PKT_DATA_SKIP_SAMPLES: return "Skip Samples";
368 case AV_PKT_DATA_JP_DUALMONO: return "JP Dual Mono";
369 case AV_PKT_DATA_STRINGS_METADATA: return "Strings Metadata";
370 case AV_PKT_DATA_SUBTITLE_POSITION: return "Subtitle Position";
371 case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL: return "Matroska BlockAdditional";
372 case AV_PKT_DATA_WEBVTT_IDENTIFIER: return "WebVTT ID";
373 case AV_PKT_DATA_WEBVTT_SETTINGS: return "WebVTT Settings";
374 case AV_PKT_DATA_METADATA_UPDATE: return "Metadata Update";
375 case AV_PKT_DATA_MPEGTS_STREAM_ID: return "MPEGTS Stream ID";
376 case AV_PKT_DATA_MASTERING_DISPLAY_METADATA: return "Mastering display metadata";
377 case AV_PKT_DATA_SPHERICAL: return "Spherical Mapping";
378 }
379 return NULL;
380}
381
382#if FF_API_MERGE_SD_API
383
384#define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
385
386int av_packet_merge_side_data(AVPacket *pkt){
387 if(pkt->side_data_elems){
388 AVBufferRef *buf;
389 int i;
390 uint8_t *p;
391 uint64_t size= pkt->size + 8LL + AV_INPUT_BUFFER_PADDING_SIZE;
392 AVPacket old= *pkt;
393 for (i=0; i<old.side_data_elems; i++) {
394 size += old.side_data[i].size + 5LL;
395 }
396 if (size > INT_MAX)
397 return AVERROR(EINVAL);
398 buf = av_buffer_alloc(size);
399 if (!buf)
400 return AVERROR(ENOMEM);
401 pkt->buf = buf;
402 pkt->data = p = buf->data;
403 pkt->size = size - AV_INPUT_BUFFER_PADDING_SIZE;
404 bytestream_put_buffer(&p, old.data, old.size);
405 for (i=old.side_data_elems-1; i>=0; i--) {
406 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
407 bytestream_put_be32(&p, old.side_data[i].size);
408 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
409 }
410 bytestream_put_be64(&p, FF_MERGE_MARKER);
411 av_assert0(p-pkt->data == pkt->size);
412 memset(p, 0, AV_INPUT_BUFFER_PADDING_SIZE);
413 av_packet_unref(&old);
414 pkt->side_data_elems = 0;
415 pkt->side_data = NULL;
416 return 1;
417 }
418 return 0;
419}
420
421int av_packet_split_side_data(AVPacket *pkt){
422 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
423 int i;
424 unsigned int size;
425 uint8_t *p;
426
427 p = pkt->data + pkt->size - 8 - 5;
428 for (i=1; ; i++){
429 size = AV_RB32(p);
430 if (size>INT_MAX - 5 || p - pkt->data < size)
431 return 0;
432 if (p[4]&128)
433 break;
434 if (p - pkt->data < size + 5)
435 return 0;
436 p-= size+5;
437 }
438
439 pkt->side_data = av_malloc_array(i, sizeof(*pkt->side_data));
440 if (!pkt->side_data)
441 return AVERROR(ENOMEM);
442
443 p= pkt->data + pkt->size - 8 - 5;
444 for (i=0; ; i++){
445 size= AV_RB32(p);
446 av_assert0(size<=INT_MAX - 5 && p - pkt->data >= size);
447 pkt->side_data[i].data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
448 pkt->side_data[i].size = size;
449 pkt->side_data[i].type = p[4]&127;
450 if (!pkt->side_data[i].data)
451 return AVERROR(ENOMEM);
452 memcpy(pkt->side_data[i].data, p-size, size);
453 pkt->size -= size + 5;
454 if(p[4]&128)
455 break;
456 p-= size+5;
457 }
458 pkt->size -= 8;
459 pkt->side_data_elems = i+1;
460 return 1;
461 }
462 return 0;
463}
464
465#endif
466
467uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
468{
469 AVDictionaryEntry *t = NULL;
470 uint8_t *data = NULL;
471 *size = 0;
472
473 if (!dict)
474 return NULL;
475
476 while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) {
477 const size_t keylen = strlen(t->key);
478 const size_t valuelen = strlen(t->value);
479 const size_t new_size = *size + keylen + 1 + valuelen + 1;
480 uint8_t *const new_data = av_realloc(data, new_size);
481
482 if (!new_data)
483 goto fail;
484 data = new_data;
485 if (new_size > INT_MAX)
486 goto fail;
487
488 memcpy(data + *size, t->key, keylen + 1);
489 memcpy(data + *size + keylen + 1, t->value, valuelen + 1);
490
491 *size = new_size;
492 }
493
494 return data;
495
496fail:
497 av_freep(&data);
498 *size = 0;
499 return NULL;
500}
501
502int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
503{
504 const uint8_t *end = data + size;
505 int ret = 0;
506
507 if (!dict || !data || !size)
508 return ret;
509 if (size && end[-1])
510 return AVERROR_INVALIDDATA;
511 while (data < end) {
512 const uint8_t *key = data;
513 const uint8_t *val = data + strlen(key) + 1;
514
515 if (val >= end || !*key)
516 return AVERROR_INVALIDDATA;
517
518 ret = av_dict_set(dict, key, val, 0);
519 if (ret < 0)
520 break;
521 data = val + strlen(val) + 1;
522 }
523
524 return ret;
525}
526
527int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
528 int size)
529{
530 int i;
531
532 for (i = 0; i < pkt->side_data_elems; i++) {
533 if (pkt->side_data[i].type == type) {
534 if (size > pkt->side_data[i].size)
535 return AVERROR(ENOMEM);
536 pkt->side_data[i].size = size;
537 return 0;
538 }
539 }
540 return AVERROR(ENOENT);
541}
542
543int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
544{
545 int i;
546
547 dst->pts = src->pts;
548 dst->dts = src->dts;
549 dst->pos = src->pos;
550 dst->duration = src->duration;
551#if FF_API_CONVERGENCE_DURATION
552FF_DISABLE_DEPRECATION_WARNINGS
553 dst->convergence_duration = src->convergence_duration;
554FF_ENABLE_DEPRECATION_WARNINGS
555#endif
556 dst->flags = src->flags;
557 dst->stream_index = src->stream_index;
558
559 for (i = 0; i < src->side_data_elems; i++) {
560 enum AVPacketSideDataType type = src->side_data[i].type;
561 int size = src->side_data[i].size;
562 uint8_t *src_data = src->side_data[i].data;
563 uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
564
565 if (!dst_data) {
566 av_packet_free_side_data(dst);
567 return AVERROR(ENOMEM);
568 }
569 memcpy(dst_data, src_data, size);
570 }
571
572 return 0;
573}
574
575void av_packet_unref(AVPacket *pkt)
576{
577 av_packet_free_side_data(pkt);
578 av_buffer_unref(&pkt->buf);
579 av_init_packet(pkt);
580 pkt->data = NULL;
581 pkt->size = 0;
582}
583
584int av_packet_ref(AVPacket *dst, const AVPacket *src)
585{
586 int ret;
587
588 ret = av_packet_copy_props(dst, src);
589 if (ret < 0)
590 return ret;
591
592 if (!src->buf) {
593 ret = packet_alloc(&dst->buf, src->size);
594 if (ret < 0)
595 goto fail;
596 if (src->size)
597 memcpy(dst->buf->data, src->data, src->size);
598
599 dst->data = dst->buf->data;
600 } else {
601 dst->buf = av_buffer_ref(src->buf);
602 if (!dst->buf) {
603 ret = AVERROR(ENOMEM);
604 goto fail;
605 }
606 dst->data = src->data;
607 }
608
609 dst->size = src->size;
610
611 return 0;
612fail:
613 av_packet_free_side_data(dst);
614 return ret;
615}
616
617AVPacket *av_packet_clone(const AVPacket *src)
618{
619 AVPacket *ret = av_packet_alloc();
620
621 if (!ret)
622 return ret;
623
624 if (av_packet_ref(ret, src))
625 av_packet_free(&ret);
626
627 return ret;
628}
629
630void av_packet_move_ref(AVPacket *dst, AVPacket *src)
631{
632 *dst = *src;
633 av_init_packet(src);
634 src->data = NULL;
635 src->size = 0;
636}
637
638void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
639{
640 if (pkt->pts != AV_NOPTS_VALUE)
641 pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
642 if (pkt->dts != AV_NOPTS_VALUE)
643 pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
644 if (pkt->duration > 0)
645 pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
646#if FF_API_CONVERGENCE_DURATION
647FF_DISABLE_DEPRECATION_WARNINGS
648 if (pkt->convergence_duration > 0)
649 pkt->convergence_duration = av_rescale_q(pkt->convergence_duration, src_tb, dst_tb);
650FF_ENABLE_DEPRECATION_WARNINGS
651#endif
652}
653
654int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type)
655{
656 uint8_t *side_data;
657 int side_data_size;
658 int i;
659
660 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS, &side_data_size);
661 if (!side_data) {
662 side_data_size = 4+4+8*error_count;
663 side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
664 side_data_size);
665 }
666
667 if (!side_data || side_data_size < 4+4+8*error_count)
668 return AVERROR(ENOMEM);
669
670 AV_WL32(side_data , quality );
671 side_data[4] = pict_type;
672 side_data[5] = error_count;
673 for (i = 0; i<error_count; i++)
674 AV_WL64(side_data+8 + 8*i , error[i]);
675
676 return 0;
677}
678
generated by cgit at 2024-05-17 05:10:36 (GMT)