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/mem.h"
27 #include "bytestream.h"
30 void ff_packet_free_side_data(AVPacket *pkt)
33 for (i = 0; i < pkt->side_data_elems; i++)
34 av_free(pkt->side_data[i].data);
35 av_freep(&pkt->side_data);
36 pkt->side_data_elems = 0;
39 void av_destruct_packet(AVPacket *pkt)
45 ff_packet_free_side_data(pkt);
48 void av_init_packet(AVPacket *pkt)
50 pkt->pts = AV_NOPTS_VALUE;
51 pkt->dts = AV_NOPTS_VALUE;
54 pkt->convergence_duration = 0;
56 pkt->stream_index = 0;
58 pkt->side_data = NULL;
59 pkt->side_data_elems = 0;
62 int av_new_packet(AVPacket *pkt, int size)
65 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
66 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
68 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
75 pkt->destruct = av_destruct_packet;
77 return AVERROR(ENOMEM);
81 void av_shrink_packet(AVPacket *pkt, int size)
83 if (pkt->size <= size)
86 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
89 int av_grow_packet(AVPacket *pkt, int grow_by)
92 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
94 return av_new_packet(pkt, grow_by);
95 if ((unsigned)grow_by >
96 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
98 new_ptr = av_realloc(pkt->data,
99 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
101 return AVERROR(ENOMEM);
103 pkt->size += grow_by;
104 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
108 #define DUP_DATA(dst, src, size, padding) \
112 if ((unsigned)(size) > \
113 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
115 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
117 data = av_malloc(size); \
121 memcpy(data, src, size); \
123 memset((uint8_t *)data + size, 0, \
124 FF_INPUT_BUFFER_PADDING_SIZE); \
128 /* Makes duplicates of data, side_data, but does not copy any other fields */
129 static int copy_packet_data(AVPacket *dst, AVPacket *src)
132 dst->side_data = NULL;
133 DUP_DATA(dst->data, src->data, dst->size, 1);
134 dst->destruct = av_destruct_packet;
136 if (dst->side_data_elems) {
139 DUP_DATA(dst->side_data, src->side_data,
140 dst->side_data_elems * sizeof(*dst->side_data), 0);
141 memset(dst->side_data, 0,
142 dst->side_data_elems * sizeof(*dst->side_data));
143 for (i = 0; i < dst->side_data_elems; i++) {
144 DUP_DATA(dst->side_data[i].data, src->side_data[i].data,
145 src->side_data[i].size, 1);
146 dst->side_data[i].size = src->side_data[i].size;
147 dst->side_data[i].type = src->side_data[i].type;
153 av_destruct_packet(dst);
154 return AVERROR(ENOMEM);
157 int av_dup_packet(AVPacket *pkt)
161 if (pkt->destruct == NULL && pkt->data) {
163 return copy_packet_data(pkt, &tmp_pkt);
168 int av_copy_packet(AVPacket *dst, AVPacket *src)
171 return copy_packet_data(dst, src);
174 void av_free_packet(AVPacket *pkt)
181 pkt->side_data = NULL;
182 pkt->side_data_elems = 0;
186 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
189 int elems = pkt->side_data_elems;
191 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
193 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
196 pkt->side_data = av_realloc(pkt->side_data,
197 (elems + 1) * sizeof(*pkt->side_data));
201 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
202 if (!pkt->side_data[elems].data)
204 pkt->side_data[elems].size = size;
205 pkt->side_data[elems].type = type;
206 pkt->side_data_elems++;
208 return pkt->side_data[elems].data;
211 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
216 for (i = 0; i < pkt->side_data_elems; i++) {
217 if (pkt->side_data[i].type == type) {
219 *size = pkt->side_data[i].size;
220 return pkt->side_data[i].data;
226 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
228 int av_packet_merge_side_data(AVPacket *pkt){
229 if(pkt->side_data_elems){
232 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
234 for (i=0; i<old.side_data_elems; i++) {
235 size += old.side_data[i].size + 5LL;
238 return AVERROR(EINVAL);
241 return AVERROR(ENOMEM);
243 pkt->destruct = av_destruct_packet;
244 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
245 bytestream_put_buffer(&p, old.data, old.size);
246 for (i=old.side_data_elems-1; i>=0; i--) {
247 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
248 bytestream_put_be32(&p, old.side_data[i].size);
249 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
251 bytestream_put_be64(&p, FF_MERGE_MARKER);
252 av_assert0(p-pkt->data == pkt->size);
253 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
254 av_free_packet(&old);
255 pkt->side_data_elems = 0;
256 pkt->side_data = NULL;
262 int av_packet_split_side_data(AVPacket *pkt){
263 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
268 p = pkt->data + pkt->size - 8 - 5;
271 if (size>INT_MAX || p - pkt->data < size)
278 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
280 return AVERROR(ENOMEM);
282 p= pkt->data + pkt->size - 8 - 5;
285 av_assert0(size<=INT_MAX && p - pkt->data >= size);
286 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
287 pkt->side_data[i].size = size;
288 pkt->side_data[i].type = p[4]&127;
289 if (!pkt->side_data[i].data)
290 return AVERROR(ENOMEM);
291 memcpy(pkt->side_data[i].data, p-size, size);
292 pkt->size -= size + 5;
298 pkt->side_data_elems = i+1;
304 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
309 for (i = 0; i < pkt->side_data_elems; i++) {
310 if (pkt->side_data[i].type == type) {
311 if (size > pkt->side_data[i].size)
312 return AVERROR(ENOMEM);
313 pkt->side_data[i].size = size;
317 return AVERROR(ENOENT);