2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
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"
30 #include "bytestream.h"
33 void av_init_packet(AVPacket *pkt)
35 pkt->pts = AV_NOPTS_VALUE;
36 pkt->dts = AV_NOPTS_VALUE;
39 pkt->convergence_duration = 0;
41 pkt->stream_index = 0;
43 pkt->side_data = NULL;
44 pkt->side_data_elems = 0;
47 static int packet_alloc(AVBufferRef **buf, int size)
50 if ((unsigned)size >= (unsigned)size + AV_INPUT_BUFFER_PADDING_SIZE)
51 return AVERROR(EINVAL);
53 ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);
57 memset((*buf)->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
62 int av_new_packet(AVPacket *pkt, int size)
64 AVBufferRef *buf = NULL;
65 int ret = packet_alloc(&buf, size);
71 pkt->data = buf->data;
77 void av_shrink_packet(AVPacket *pkt, int size)
79 if (pkt->size <= size)
82 memset(pkt->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
85 int av_grow_packet(AVPacket *pkt, int grow_by)
88 av_assert0((unsigned)pkt->size <= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
90 return av_new_packet(pkt, grow_by);
91 if ((unsigned)grow_by >
92 INT_MAX - (pkt->size + AV_INPUT_BUFFER_PADDING_SIZE))
95 new_size = pkt->size + grow_by + AV_INPUT_BUFFER_PADDING_SIZE;
97 int ret = av_buffer_realloc(&pkt->buf, new_size);
101 pkt->buf = av_buffer_alloc(new_size);
103 return AVERROR(ENOMEM);
104 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
106 pkt->data = pkt->buf->data;
107 pkt->size += grow_by;
108 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
113 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
115 if (size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
116 return AVERROR(EINVAL);
118 pkt->buf = av_buffer_create(data, size + AV_INPUT_BUFFER_PADDING_SIZE,
119 av_buffer_default_free, NULL, 0);
121 return AVERROR(ENOMEM);
129 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
130 #define ALLOC_BUF(data, size) \
132 av_buffer_realloc(&pkt->buf, size); \
133 data = pkt->buf ? pkt->buf->data : NULL; \
136 #define DUP_DATA(dst, src, size, padding, ALLOC) \
140 if ((unsigned)(size) > \
141 (unsigned)(size) + AV_INPUT_BUFFER_PADDING_SIZE) \
143 ALLOC(data, size + AV_INPUT_BUFFER_PADDING_SIZE); \
149 memcpy(data, src, size); \
151 memset((uint8_t *)data + size, 0, \
152 AV_INPUT_BUFFER_PADDING_SIZE); \
156 /* Makes duplicates of data, side_data, but does not copy any other fields */
157 static int copy_packet_data(AVPacket *pkt, const AVPacket *src, int dup)
160 pkt->side_data = NULL;
162 AVBufferRef *ref = av_buffer_ref(src->buf);
164 return AVERROR(ENOMEM);
166 pkt->data = ref->data;
168 DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);
170 if (pkt->side_data_elems && dup)
171 pkt->side_data = src->side_data;
172 if (pkt->side_data_elems && !dup) {
173 return av_copy_packet_side_data(pkt, src);
179 return AVERROR(ENOMEM);
182 int av_copy_packet_side_data(AVPacket *pkt, const AVPacket *src)
184 if (src->side_data_elems) {
186 DUP_DATA(pkt->side_data, src->side_data,
187 src->side_data_elems * sizeof(*src->side_data), 0, ALLOC_MALLOC);
189 memset(pkt->side_data, 0,
190 src->side_data_elems * sizeof(*src->side_data));
192 for (i = 0; i < src->side_data_elems; i++) {
193 DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,
194 src->side_data[i].size, 1, ALLOC_MALLOC);
195 pkt->side_data[i].size = src->side_data[i].size;
196 pkt->side_data[i].type = src->side_data[i].type;
199 pkt->side_data_elems = src->side_data_elems;
204 return AVERROR(ENOMEM);
207 int av_dup_packet(AVPacket *pkt)
211 if (!pkt->buf && pkt->data) {
213 return copy_packet_data(pkt, &tmp_pkt, 1);
218 int av_copy_packet(AVPacket *dst, const AVPacket *src)
221 return copy_packet_data(dst, src, 0);
224 void av_packet_free_side_data(AVPacket *pkt)
227 for (i = 0; i < pkt->side_data_elems; i++)
228 av_freep(&pkt->side_data[i].data);
229 av_freep(&pkt->side_data);
230 pkt->side_data_elems = 0;
233 void av_free_packet(AVPacket *pkt)
237 av_buffer_unref(&pkt->buf);
241 av_packet_free_side_data(pkt);
245 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
248 int elems = pkt->side_data_elems;
250 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
252 if ((unsigned)size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
255 pkt->side_data = av_realloc(pkt->side_data,
256 (elems + 1) * sizeof(*pkt->side_data));
260 pkt->side_data[elems].data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
261 if (!pkt->side_data[elems].data)
263 pkt->side_data[elems].size = size;
264 pkt->side_data[elems].type = type;
265 pkt->side_data_elems++;
267 return pkt->side_data[elems].data;
270 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
275 for (i = 0; i < pkt->side_data_elems; i++) {
276 if (pkt->side_data[i].type == type) {
278 *size = pkt->side_data[i].size;
279 return pkt->side_data[i].data;
285 const char *av_packet_side_data_name(enum AVPacketSideDataType type)
288 case AV_PKT_DATA_PALETTE: return "Palette";
289 case AV_PKT_DATA_NEW_EXTRADATA: return "New Extradata";
290 case AV_PKT_DATA_PARAM_CHANGE: return "Param Change";
291 case AV_PKT_DATA_H263_MB_INFO: return "H263 MB Info";
292 case AV_PKT_DATA_REPLAYGAIN: return "Replay Gain";
293 case AV_PKT_DATA_DISPLAYMATRIX: return "Display Matrix";
294 case AV_PKT_DATA_STEREO3D: return "Stereo 3D";
295 case AV_PKT_DATA_AUDIO_SERVICE_TYPE: return "Audio Service Type";
296 case AV_PKT_DATA_SKIP_SAMPLES: return "Skip Samples";
297 case AV_PKT_DATA_JP_DUALMONO: return "JP Dual Mono";
298 case AV_PKT_DATA_STRINGS_METADATA: return "Strings Metadata";
299 case AV_PKT_DATA_SUBTITLE_POSITION: return "Subtitle Position";
300 case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL: return "Matroska BlockAdditional";
301 case AV_PKT_DATA_WEBVTT_IDENTIFIER: return "WebVTT ID";
302 case AV_PKT_DATA_WEBVTT_SETTINGS: return "WebVTT Settings";
303 case AV_PKT_DATA_METADATA_UPDATE: return "Metadata Update";
308 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
310 int av_packet_merge_side_data(AVPacket *pkt){
311 if(pkt->side_data_elems){
315 uint64_t size= pkt->size + 8LL + AV_INPUT_BUFFER_PADDING_SIZE;
317 for (i=0; i<old.side_data_elems; i++) {
318 size += old.side_data[i].size + 5LL;
321 return AVERROR(EINVAL);
322 buf = av_buffer_alloc(size);
324 return AVERROR(ENOMEM);
326 pkt->data = p = buf->data;
327 pkt->size = size - AV_INPUT_BUFFER_PADDING_SIZE;
328 bytestream_put_buffer(&p, old.data, old.size);
329 for (i=old.side_data_elems-1; i>=0; i--) {
330 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
331 bytestream_put_be32(&p, old.side_data[i].size);
332 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
334 bytestream_put_be64(&p, FF_MERGE_MARKER);
335 av_assert0(p-pkt->data == pkt->size);
336 memset(p, 0, AV_INPUT_BUFFER_PADDING_SIZE);
337 av_free_packet(&old);
338 pkt->side_data_elems = 0;
339 pkt->side_data = NULL;
345 int av_packet_split_side_data(AVPacket *pkt){
346 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
351 p = pkt->data + pkt->size - 8 - 5;
354 if (size>INT_MAX || p - pkt->data < size)
361 pkt->side_data = av_malloc_array(i, sizeof(*pkt->side_data));
363 return AVERROR(ENOMEM);
365 p= pkt->data + pkt->size - 8 - 5;
368 av_assert0(size<=INT_MAX && p - pkt->data >= size);
369 pkt->side_data[i].data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
370 pkt->side_data[i].size = size;
371 pkt->side_data[i].type = p[4]&127;
372 if (!pkt->side_data[i].data)
373 return AVERROR(ENOMEM);
374 memcpy(pkt->side_data[i].data, p-size, size);
375 pkt->size -= size + 5;
381 pkt->side_data_elems = i+1;
387 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
389 AVDictionaryEntry *t = NULL;
390 uint8_t *data = NULL;
396 while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) {
397 const size_t keylen = strlen(t->key);
398 const size_t valuelen = strlen(t->value);
399 const size_t new_size = *size + keylen + 1 + valuelen + 1;
400 uint8_t *const new_data = av_realloc(data, new_size);
405 if (new_size > INT_MAX)
408 memcpy(data + *size, t->key, keylen + 1);
409 memcpy(data + *size + keylen + 1, t->value, valuelen + 1);
422 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
424 const uint8_t *end = data + size;
427 if (!dict || !data || !size)
430 return AVERROR_INVALIDDATA;
432 const uint8_t *key = data;
433 const uint8_t *val = data + strlen(key) + 1;
436 return AVERROR_INVALIDDATA;
438 ret = av_dict_set(dict, key, val, 0);
441 data = val + strlen(val) + 1;
447 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
452 for (i = 0; i < pkt->side_data_elems; i++) {
453 if (pkt->side_data[i].type == type) {
454 if (size > pkt->side_data[i].size)
455 return AVERROR(ENOMEM);
456 pkt->side_data[i].size = size;
460 return AVERROR(ENOENT);
463 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
470 dst->duration = src->duration;
471 dst->convergence_duration = src->convergence_duration;
472 dst->flags = src->flags;
473 dst->stream_index = src->stream_index;
475 for (i = 0; i < src->side_data_elems; i++) {
476 enum AVPacketSideDataType type = src->side_data[i].type;
477 int size = src->side_data[i].size;
478 uint8_t *src_data = src->side_data[i].data;
479 uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
482 av_packet_free_side_data(dst);
483 return AVERROR(ENOMEM);
485 memcpy(dst_data, src_data, size);
491 void av_packet_unref(AVPacket *pkt)
493 av_packet_free_side_data(pkt);
494 av_buffer_unref(&pkt->buf);
500 int av_packet_ref(AVPacket *dst, const AVPacket *src)
504 ret = av_packet_copy_props(dst, src);
509 ret = packet_alloc(&dst->buf, src->size);
512 memcpy(dst->buf->data, src->data, src->size);
514 dst->buf = av_buffer_ref(src->buf);
516 ret = AVERROR(ENOMEM);
521 dst->size = src->size;
522 dst->data = dst->buf->data;
525 av_packet_free_side_data(dst);
529 void av_packet_move_ref(AVPacket *dst, AVPacket *src)
535 void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
537 if (pkt->pts != AV_NOPTS_VALUE)
538 pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
539 if (pkt->dts != AV_NOPTS_VALUE)
540 pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
541 if (pkt->duration > 0)
542 pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
543 if (pkt->convergence_duration > 0)
544 pkt->convergence_duration = av_rescale_q(pkt->convergence_duration, src_tb, dst_tb);
547 int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type)
553 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS, &side_data_size);
555 side_data_size = 4+4+8*error_count;
556 side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
560 if (!side_data || side_data_size < 4+4+8*error_count)
561 return AVERROR(ENOMEM);
563 AV_WL32(side_data , quality );
564 side_data[4] = pict_type;
565 side_data[5] = error_count;
566 for (i = 0; i<error_count; i++)
567 AV_WL64(side_data+8 + 8*i , error[i]);