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)
46 void av_init_packet(AVPacket *pkt)
48 pkt->pts = AV_NOPTS_VALUE;
49 pkt->dts = AV_NOPTS_VALUE;
52 pkt->convergence_duration = 0;
54 pkt->stream_index = 0;
56 pkt->side_data = NULL;
57 pkt->side_data_elems = 0;
60 int av_new_packet(AVPacket *pkt, int size)
63 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
64 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
66 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
73 pkt->destruct = av_destruct_packet;
75 return AVERROR(ENOMEM);
79 void av_shrink_packet(AVPacket *pkt, int size)
81 if (pkt->size <= size)
84 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
87 int av_grow_packet(AVPacket *pkt, int grow_by)
90 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
92 return av_new_packet(pkt, grow_by);
93 if ((unsigned)grow_by >
94 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
96 new_ptr = av_realloc(pkt->data,
97 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
99 return AVERROR(ENOMEM);
101 pkt->size += grow_by;
102 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
106 #define DUP_DATA(dst, src, size, padding) \
110 if ((unsigned)(size) > \
111 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
113 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
115 data = av_malloc(size); \
119 memcpy(data, src, size); \
121 memset((uint8_t *)data + size, 0, \
122 FF_INPUT_BUFFER_PADDING_SIZE); \
126 /* Makes duplicates of data, side_data, but does not copy any other fields */
127 static int copy_packet_data(AVPacket *dst, AVPacket *src)
130 dst->side_data = NULL;
131 DUP_DATA(dst->data, src->data, dst->size, 1);
132 dst->destruct = av_destruct_packet;
134 if (dst->side_data_elems) {
137 DUP_DATA(dst->side_data, src->side_data,
138 dst->side_data_elems * sizeof(*dst->side_data), 0);
139 memset(dst->side_data, 0,
140 dst->side_data_elems * sizeof(*dst->side_data));
141 for (i = 0; i < dst->side_data_elems; i++) {
142 DUP_DATA(dst->side_data[i].data, src->side_data[i].data,
143 src->side_data[i].size, 1);
144 dst->side_data[i].size = src->side_data[i].size;
145 dst->side_data[i].type = src->side_data[i].type;
151 av_destruct_packet(dst);
152 return AVERROR(ENOMEM);
155 int av_dup_packet(AVPacket *pkt)
159 if (pkt->destruct == NULL && pkt->data) {
161 return copy_packet_data(pkt, &tmp_pkt);
166 int av_copy_packet(AVPacket *dst, AVPacket *src)
169 return copy_packet_data(dst, src);
172 void av_free_packet(AVPacket *pkt)
182 for (i = 0; i < pkt->side_data_elems; i++)
183 av_free(pkt->side_data[i].data);
184 av_freep(&pkt->side_data);
185 pkt->side_data_elems = 0;
189 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
192 int elems = pkt->side_data_elems;
194 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
196 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
199 pkt->side_data = av_realloc(pkt->side_data,
200 (elems + 1) * sizeof(*pkt->side_data));
204 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
205 if (!pkt->side_data[elems].data)
207 pkt->side_data[elems].size = size;
208 pkt->side_data[elems].type = type;
209 pkt->side_data_elems++;
211 return pkt->side_data[elems].data;
214 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
219 for (i = 0; i < pkt->side_data_elems; i++) {
220 if (pkt->side_data[i].type == type) {
222 *size = pkt->side_data[i].size;
223 return pkt->side_data[i].data;
229 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
231 int av_packet_merge_side_data(AVPacket *pkt){
232 if(pkt->side_data_elems){
235 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
237 for (i=0; i<old.side_data_elems; i++) {
238 size += old.side_data[i].size + 5LL;
241 return AVERROR(EINVAL);
244 return AVERROR(ENOMEM);
246 pkt->destruct = av_destruct_packet;
247 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
248 bytestream_put_buffer(&p, old.data, old.size);
249 for (i=old.side_data_elems-1; i>=0; i--) {
250 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
251 bytestream_put_be32(&p, old.side_data[i].size);
252 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
254 bytestream_put_be64(&p, FF_MERGE_MARKER);
255 av_assert0(p-pkt->data == pkt->size);
256 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
257 av_free_packet(&old);
258 pkt->side_data_elems = 0;
259 pkt->side_data = NULL;
265 int av_packet_split_side_data(AVPacket *pkt){
266 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
271 p = pkt->data + pkt->size - 8 - 5;
274 if (size>INT_MAX || p - pkt->data < size)
281 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
283 return AVERROR(ENOMEM);
285 p= pkt->data + pkt->size - 8 - 5;
288 av_assert0(size<=INT_MAX && p - pkt->data >= size);
289 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
290 pkt->side_data[i].size = size;
291 pkt->side_data[i].type = p[4]&127;
292 if (!pkt->side_data[i].data)
293 return AVERROR(ENOMEM);
294 memcpy(pkt->side_data[i].data, p-size, size);
295 pkt->size -= size + 5;
301 pkt->side_data_elems = i+1;
307 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
312 for (i = 0; i < pkt->side_data_elems; i++) {
313 if (pkt->side_data[i].type == type) {
314 if (size > pkt->side_data[i].size)
315 return AVERROR(ENOMEM);
316 pkt->side_data[i].size = size;
320 return AVERROR(ENOENT);