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/mem.h"
29 #include "bytestream.h"
32 #if FF_API_DESTRUCT_PACKET
34 void av_destruct_packet(AVPacket *pkt)
41 /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
42 * NULL => static data */
43 static void dummy_destruct_packet(AVPacket *pkt)
49 void av_init_packet(AVPacket *pkt)
51 pkt->pts = AV_NOPTS_VALUE;
52 pkt->dts = AV_NOPTS_VALUE;
55 pkt->convergence_duration = 0;
57 pkt->stream_index = 0;
58 #if FF_API_DESTRUCT_PACKET
59 FF_DISABLE_DEPRECATION_WARNINGS
61 FF_ENABLE_DEPRECATION_WARNINGS
64 pkt->side_data = NULL;
65 pkt->side_data_elems = 0;
68 static int packet_alloc(AVBufferRef **buf, int size)
71 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
72 return AVERROR(EINVAL);
74 ret = av_buffer_realloc(buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
78 memset((*buf)->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
83 int av_new_packet(AVPacket *pkt, int size)
85 AVBufferRef *buf = NULL;
86 int ret = packet_alloc(&buf, size);
92 pkt->data = buf->data;
94 #if FF_API_DESTRUCT_PACKET
95 FF_DISABLE_DEPRECATION_WARNINGS
96 pkt->destruct = dummy_destruct_packet;
97 FF_ENABLE_DEPRECATION_WARNINGS
103 void av_shrink_packet(AVPacket *pkt, int size)
105 if (pkt->size <= size)
108 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
111 int av_grow_packet(AVPacket *pkt, int grow_by)
114 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
116 return av_new_packet(pkt, grow_by);
117 if ((unsigned)grow_by >
118 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
121 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
123 int ret = av_buffer_realloc(&pkt->buf, new_size);
127 pkt->buf = av_buffer_alloc(new_size);
129 return AVERROR(ENOMEM);
130 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
131 #if FF_API_DESTRUCT_PACKET
132 FF_DISABLE_DEPRECATION_WARNINGS
133 pkt->destruct = dummy_destruct_packet;
134 FF_ENABLE_DEPRECATION_WARNINGS
137 pkt->data = pkt->buf->data;
138 pkt->size += grow_by;
139 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
144 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
146 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
147 return AVERROR(EINVAL);
149 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
150 av_buffer_default_free, NULL, 0);
152 return AVERROR(ENOMEM);
156 #if FF_API_DESTRUCT_PACKET
157 FF_DISABLE_DEPRECATION_WARNINGS
158 pkt->destruct = dummy_destruct_packet;
159 FF_ENABLE_DEPRECATION_WARNINGS
165 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
166 #define ALLOC_BUF(data, size) \
168 av_buffer_realloc(&pkt->buf, size); \
169 data = pkt->buf ? pkt->buf->data : NULL; \
172 #define DUP_DATA(dst, src, size, padding, ALLOC) \
176 if ((unsigned)(size) > \
177 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
179 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
185 memcpy(data, src, size); \
187 memset((uint8_t *)data + size, 0, \
188 FF_INPUT_BUFFER_PADDING_SIZE); \
192 /* Makes duplicates of data, side_data, but does not copy any other fields */
193 static int copy_packet_data(AVPacket *pkt, AVPacket *src, int dup)
196 pkt->side_data = NULL;
198 AVBufferRef *ref = av_buffer_ref(src->buf);
200 return AVERROR(ENOMEM);
202 pkt->data = ref->data;
204 DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);
206 #if FF_API_DESTRUCT_PACKET
207 FF_DISABLE_DEPRECATION_WARNINGS
208 pkt->destruct = dummy_destruct_packet;
209 FF_ENABLE_DEPRECATION_WARNINGS
211 if (pkt->side_data_elems && dup)
212 pkt->side_data = src->side_data;
213 if (pkt->side_data_elems && !dup) {
214 return av_copy_packet_side_data(pkt, src);
220 return AVERROR(ENOMEM);
223 int av_copy_packet_side_data(AVPacket *pkt, AVPacket *src)
225 if (src->side_data_elems) {
227 DUP_DATA(pkt->side_data, src->side_data,
228 src->side_data_elems * sizeof(*src->side_data), 0, ALLOC_MALLOC);
230 memset(pkt->side_data, 0,
231 src->side_data_elems * sizeof(*src->side_data));
233 for (i = 0; i < src->side_data_elems; i++) {
234 DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,
235 src->side_data[i].size, 1, ALLOC_MALLOC);
236 pkt->side_data[i].size = src->side_data[i].size;
237 pkt->side_data[i].type = src->side_data[i].type;
244 return AVERROR(ENOMEM);
247 int av_dup_packet(AVPacket *pkt)
251 FF_DISABLE_DEPRECATION_WARNINGS
252 if (!pkt->buf && pkt->data
253 #if FF_API_DESTRUCT_PACKET
257 FF_ENABLE_DEPRECATION_WARNINGS
259 return copy_packet_data(pkt, &tmp_pkt, 1);
264 int av_copy_packet(AVPacket *dst, AVPacket *src)
267 return copy_packet_data(dst, src, 0);
270 void av_packet_free_side_data(AVPacket *pkt)
273 for (i = 0; i < pkt->side_data_elems; i++)
274 av_free(pkt->side_data[i].data);
275 av_freep(&pkt->side_data);
276 pkt->side_data_elems = 0;
279 void av_free_packet(AVPacket *pkt)
282 FF_DISABLE_DEPRECATION_WARNINGS
284 av_buffer_unref(&pkt->buf);
285 #if FF_API_DESTRUCT_PACKET
286 else if (pkt->destruct)
288 pkt->destruct = NULL;
290 FF_ENABLE_DEPRECATION_WARNINGS
294 av_packet_free_side_data(pkt);
298 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
301 int elems = pkt->side_data_elems;
303 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
305 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
308 pkt->side_data = av_realloc(pkt->side_data,
309 (elems + 1) * sizeof(*pkt->side_data));
313 pkt->side_data[elems].data = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
314 if (!pkt->side_data[elems].data)
316 pkt->side_data[elems].size = size;
317 pkt->side_data[elems].type = type;
318 pkt->side_data_elems++;
320 return pkt->side_data[elems].data;
323 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
328 for (i = 0; i < pkt->side_data_elems; i++) {
329 if (pkt->side_data[i].type == type) {
331 *size = pkt->side_data[i].size;
332 return pkt->side_data[i].data;
338 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
340 int av_packet_merge_side_data(AVPacket *pkt){
341 if(pkt->side_data_elems){
345 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
347 for (i=0; i<old.side_data_elems; i++) {
348 size += old.side_data[i].size + 5LL;
351 return AVERROR(EINVAL);
352 buf = av_buffer_alloc(size);
354 return AVERROR(ENOMEM);
356 pkt->data = p = buf->data;
357 #if FF_API_DESTRUCT_PACKET
358 FF_DISABLE_DEPRECATION_WARNINGS
359 pkt->destruct = dummy_destruct_packet;
360 FF_ENABLE_DEPRECATION_WARNINGS
362 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
363 bytestream_put_buffer(&p, old.data, old.size);
364 for (i=old.side_data_elems-1; i>=0; i--) {
365 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
366 bytestream_put_be32(&p, old.side_data[i].size);
367 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
369 bytestream_put_be64(&p, FF_MERGE_MARKER);
370 av_assert0(p-pkt->data == pkt->size);
371 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
372 av_free_packet(&old);
373 pkt->side_data_elems = 0;
374 pkt->side_data = NULL;
380 int av_packet_split_side_data(AVPacket *pkt){
381 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
383 unsigned int size, orig_pktsize = pkt->size;
386 p = pkt->data + pkt->size - 8 - 5;
389 if (size>INT_MAX || p - pkt->data < size)
396 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
398 return AVERROR(ENOMEM);
400 p= pkt->data + pkt->size - 8 - 5;
403 av_assert0(size<=INT_MAX && p - pkt->data >= size);
404 pkt->side_data[i].data = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
405 pkt->side_data[i].size = size;
406 pkt->side_data[i].type = p[4]&127;
407 if (!pkt->side_data[i].data)
408 return AVERROR(ENOMEM);
409 memcpy(pkt->side_data[i].data, p-size, size);
410 pkt->size -= size + 5;
416 /* FFMIN() prevents overflow in case the packet wasn't allocated with
418 * If the side data is smaller than the buffer padding size, the
419 * remaining bytes should have already been filled with zeros by the
420 * original packet allocation anyway. */
421 memset(pkt->data + pkt->size, 0,
422 FFMIN(orig_pktsize - pkt->size, FF_INPUT_BUFFER_PADDING_SIZE));
423 pkt->side_data_elems = i+1;
429 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
434 for (i = 0; i < pkt->side_data_elems; i++) {
435 if (pkt->side_data[i].type == type) {
436 if (size > pkt->side_data[i].size)
437 return AVERROR(ENOMEM);
438 pkt->side_data[i].size = size;
442 return AVERROR(ENOENT);
445 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
452 dst->duration = src->duration;
453 dst->convergence_duration = src->convergence_duration;
454 dst->flags = src->flags;
455 dst->stream_index = src->stream_index;
456 dst->side_data_elems = src->side_data_elems;
458 for (i = 0; i < src->side_data_elems; i++) {
459 enum AVPacketSideDataType type = src->side_data[i].type;
460 int size = src->side_data[i].size;
461 uint8_t *src_data = src->side_data[i].data;
462 uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
465 av_packet_free_side_data(dst);
466 return AVERROR(ENOMEM);
468 memcpy(dst_data, src_data, size);
474 void av_packet_unref(AVPacket *pkt)
476 av_packet_free_side_data(pkt);
477 av_buffer_unref(&pkt->buf);
483 int av_packet_ref(AVPacket *dst, AVPacket *src)
487 ret = av_packet_copy_props(dst, src);
492 ret = packet_alloc(&dst->buf, src->size);
495 memcpy(dst->buf->data, src->data, src->size);
497 dst->buf = av_buffer_ref(src->buf);
499 dst->size = src->size;
500 dst->data = dst->buf->data;
503 av_packet_free_side_data(dst);
507 void av_packet_move_ref(AVPacket *dst, AVPacket *src)