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
23 #include "libavutil/avassert.h"
24 #include "bytestream.h"
27 void av_destruct_packet_nofree(AVPacket *pkt)
31 pkt->side_data = NULL;
32 pkt->side_data_elems = 0;
35 void ff_packet_free_side_data(AVPacket *pkt)
38 for (i = 0; i < pkt->side_data_elems; i++)
39 av_free(pkt->side_data[i].data);
40 av_freep(&pkt->side_data);
41 pkt->side_data_elems = 0;
44 void av_destruct_packet(AVPacket *pkt)
50 ff_packet_free_side_data(pkt);
53 void av_init_packet(AVPacket *pkt)
55 pkt->pts = AV_NOPTS_VALUE;
56 pkt->dts = AV_NOPTS_VALUE;
59 pkt->convergence_duration = 0;
61 pkt->stream_index = 0;
63 pkt->side_data = NULL;
64 pkt->side_data_elems = 0;
67 int av_new_packet(AVPacket *pkt, int size)
70 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
71 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
73 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
80 pkt->destruct = av_destruct_packet;
82 return AVERROR(ENOMEM);
86 void av_shrink_packet(AVPacket *pkt, int size)
88 if (pkt->size <= size)
91 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
94 int av_grow_packet(AVPacket *pkt, int grow_by)
97 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
99 return av_new_packet(pkt, grow_by);
100 if ((unsigned)grow_by >
101 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
103 new_ptr = av_realloc(pkt->data,
104 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
106 return AVERROR(ENOMEM);
108 pkt->size += grow_by;
109 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
113 #define DUP_DATA(dst, src, size, padding) \
117 if ((unsigned)(size) > \
118 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
120 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
122 data = av_malloc(size); \
126 memcpy(data, src, size); \
128 memset((uint8_t *)data + size, 0, \
129 FF_INPUT_BUFFER_PADDING_SIZE); \
133 int av_dup_packet(AVPacket *pkt)
137 if (((pkt->destruct == av_destruct_packet_nofree) ||
138 (pkt->destruct == NULL)) && pkt->data) {
142 pkt->side_data = NULL;
143 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
144 pkt->destruct = av_destruct_packet;
146 if (pkt->side_data_elems) {
149 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
150 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
151 memset(pkt->side_data, 0,
152 pkt->side_data_elems * sizeof(*pkt->side_data));
153 for (i = 0; i < pkt->side_data_elems; i++)
154 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
155 pkt->side_data[i].size, 1);
161 av_destruct_packet(pkt);
162 return AVERROR(ENOMEM);
165 void av_free_packet(AVPacket *pkt)
172 pkt->side_data = NULL;
173 pkt->side_data_elems = 0;
177 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
180 int elems = pkt->side_data_elems;
182 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
184 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
187 pkt->side_data = av_realloc(pkt->side_data,
188 (elems + 1) * sizeof(*pkt->side_data));
192 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
193 if (!pkt->side_data[elems].data)
195 pkt->side_data[elems].size = size;
196 pkt->side_data[elems].type = type;
197 pkt->side_data_elems++;
199 return pkt->side_data[elems].data;
202 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
207 for (i = 0; i < pkt->side_data_elems; i++) {
208 if (pkt->side_data[i].type == type) {
210 *size = pkt->side_data[i].size;
211 return pkt->side_data[i].data;
217 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
219 int av_packet_merge_side_data(AVPacket *pkt){
220 if(pkt->side_data_elems){
223 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
225 for (i=0; i<old.side_data_elems; i++) {
226 size += old.side_data[i].size + 5LL;
229 return AVERROR(EINVAL);
232 return AVERROR(ENOMEM);
234 pkt->destruct = av_destruct_packet;
235 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
236 bytestream_put_buffer(&p, old.data, old.size);
237 for (i=old.side_data_elems-1; i>=0; i--) {
238 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
239 bytestream_put_be32(&p, old.side_data[i].size);
240 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
242 bytestream_put_be64(&p, FF_MERGE_MARKER);
243 av_assert0(p-pkt->data == pkt->size);
244 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
245 av_free_packet(&old);
246 pkt->side_data_elems = 0;
247 pkt->side_data = NULL;
253 int av_packet_split_side_data(AVPacket *pkt){
254 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
259 p = pkt->data + pkt->size - 8 - 5;
262 if (size>INT_MAX || p - pkt->data <= size)
269 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
271 return AVERROR(ENOMEM);
273 p= pkt->data + pkt->size - 8 - 5;
276 av_assert0(size<=INT_MAX && p - pkt->data > size);
277 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
278 pkt->side_data[i].size = size;
279 pkt->side_data[i].type = p[4]&127;
280 if (!pkt->side_data[i].data)
281 return AVERROR(ENOMEM);
282 memcpy(pkt->side_data[i].data, p-size, size);
283 pkt->size -= size + 5;
289 pkt->side_data_elems = i+1;
295 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
300 for (i = 0; i < pkt->side_data_elems; i++) {
301 if (pkt->side_data[i].type == type) {
302 if (size > pkt->side_data[i].size)
303 return AVERROR(ENOMEM);
304 pkt->side_data[i].size = size;
308 return AVERROR(ENOENT);