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
24 #include "libavutil/avassert.h"
25 #include "libavutil/mem.h"
28 void av_destruct_packet_nofree(AVPacket *pkt)
32 pkt->side_data = NULL;
33 pkt->side_data_elems = 0;
36 void av_destruct_packet(AVPacket *pkt)
44 for (i = 0; i < pkt->side_data_elems; i++)
45 av_free(pkt->side_data[i].data);
46 av_freep(&pkt->side_data);
47 pkt->side_data_elems = 0;
50 void av_init_packet(AVPacket *pkt)
52 pkt->pts = AV_NOPTS_VALUE;
53 pkt->dts = AV_NOPTS_VALUE;
56 pkt->convergence_duration = 0;
58 pkt->stream_index = 0;
60 pkt->side_data = NULL;
61 pkt->side_data_elems = 0;
64 int av_new_packet(AVPacket *pkt, int size)
67 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
68 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
70 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
77 pkt->destruct = av_destruct_packet;
79 return AVERROR(ENOMEM);
83 void av_shrink_packet(AVPacket *pkt, int size)
85 if (pkt->size <= size)
88 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
91 int av_grow_packet(AVPacket *pkt, int grow_by)
94 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
96 return av_new_packet(pkt, grow_by);
97 if ((unsigned)grow_by >
98 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
100 new_ptr = av_realloc(pkt->data,
101 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
103 return AVERROR(ENOMEM);
105 pkt->size += grow_by;
106 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
110 #define DUP_DATA(dst, src, size, padding) \
114 if ((unsigned)(size) > \
115 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
117 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
119 data = av_malloc(size); \
123 memcpy(data, src, size); \
125 memset((uint8_t *)data + size, 0, \
126 FF_INPUT_BUFFER_PADDING_SIZE); \
130 int av_dup_packet(AVPacket *pkt)
134 if (((pkt->destruct == av_destruct_packet_nofree) ||
135 (pkt->destruct == NULL)) && pkt->data) {
139 pkt->side_data = NULL;
140 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
141 pkt->destruct = av_destruct_packet;
143 if (pkt->side_data_elems) {
146 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
147 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
148 memset(pkt->side_data, 0,
149 pkt->side_data_elems * sizeof(*pkt->side_data));
150 for (i = 0; i < pkt->side_data_elems; i++)
151 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
152 tmp_pkt.side_data[i].size, 1);
158 av_destruct_packet(pkt);
159 return AVERROR(ENOMEM);
162 void av_free_packet(AVPacket *pkt)
169 pkt->side_data = NULL;
170 pkt->side_data_elems = 0;
174 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
177 int elems = pkt->side_data_elems;
179 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
181 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
184 pkt->side_data = av_realloc(pkt->side_data,
185 (elems + 1) * sizeof(*pkt->side_data));
189 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
190 if (!pkt->side_data[elems].data)
192 pkt->side_data[elems].size = size;
193 pkt->side_data[elems].type = type;
194 pkt->side_data_elems++;
196 return pkt->side_data[elems].data;
199 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
204 for (i = 0; i < pkt->side_data_elems; i++) {
205 if (pkt->side_data[i].type == type) {
207 *size = pkt->side_data[i].size;
208 return pkt->side_data[i].data;
214 int av_packet_shrink_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) {
221 if (size > pkt->side_data[i].size)
222 return AVERROR(ENOMEM);
223 pkt->side_data[i].size = size;
227 return AVERROR(ENOENT);