2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avassert.h"
25 void av_destruct_packet_nofree(AVPacket *pkt)
29 pkt->side_data = NULL;
30 pkt->side_data_elems = 0;
33 void av_destruct_packet(AVPacket *pkt)
41 for (i = 0; i < pkt->side_data_elems; i++)
42 av_free(pkt->side_data[i].data);
43 av_freep(&pkt->side_data);
44 pkt->side_data_elems = 0;
47 void av_init_packet(AVPacket *pkt)
49 pkt->pts = AV_NOPTS_VALUE;
50 pkt->dts = AV_NOPTS_VALUE;
53 pkt->convergence_duration = 0;
55 pkt->stream_index = 0;
57 pkt->side_data = NULL;
58 pkt->side_data_elems = 0;
61 int av_new_packet(AVPacket *pkt, int size)
64 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
65 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
67 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
74 pkt->destruct = av_destruct_packet;
76 return AVERROR(ENOMEM);
80 void av_shrink_packet(AVPacket *pkt, int size)
82 if (pkt->size <= size)
85 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
88 int av_grow_packet(AVPacket *pkt, int grow_by)
91 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
93 return av_new_packet(pkt, grow_by);
94 if ((unsigned)grow_by >
95 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
97 new_ptr = av_realloc(pkt->data,
98 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
100 return AVERROR(ENOMEM);
102 pkt->size += grow_by;
103 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
107 #define DUP_DATA(dst, src, size, padding) \
111 if ((unsigned)(size) > \
112 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
114 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
116 data = av_malloc(size); \
120 memcpy(data, src, size); \
122 memset((uint8_t *)data + size, 0, \
123 FF_INPUT_BUFFER_PADDING_SIZE); \
127 int av_dup_packet(AVPacket *pkt)
131 if (((pkt->destruct == av_destruct_packet_nofree) ||
132 (pkt->destruct == NULL)) && pkt->data) {
136 pkt->side_data = NULL;
137 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
138 pkt->destruct = av_destruct_packet;
140 if (pkt->side_data_elems) {
143 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
144 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
145 memset(pkt->side_data, 0,
146 pkt->side_data_elems * sizeof(*pkt->side_data));
147 for (i = 0; i < pkt->side_data_elems; i++)
148 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
149 pkt->side_data[i].size, 1);
155 av_destruct_packet(pkt);
156 return AVERROR(ENOMEM);
159 void av_free_packet(AVPacket *pkt)
166 pkt->side_data = NULL;
167 pkt->side_data_elems = 0;
171 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
174 int elems = pkt->side_data_elems;
176 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
178 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
181 pkt->side_data = av_realloc(pkt->side_data,
182 (elems + 1) * sizeof(*pkt->side_data));
186 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
187 if (!pkt->side_data[elems].data)
189 pkt->side_data[elems].size = size;
190 pkt->side_data[elems].type = type;
191 pkt->side_data_elems++;
193 return pkt->side_data[elems].data;
196 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
201 for (i = 0; i < pkt->side_data_elems; i++) {
202 if (pkt->side_data[i].type == type) {
204 *size = pkt->side_data[i].size;
205 return pkt->side_data[i].data;
211 int av_packet_shrink_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) {
218 if (size > pkt->side_data[i].size)
219 return AVERROR(ENOMEM);
220 pkt->side_data[i].size = size;
224 return AVERROR(ENOENT);