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(AVPacket *pkt)
35 void av_init_packet(AVPacket *pkt)
37 pkt->pts = AV_NOPTS_VALUE;
38 pkt->dts = AV_NOPTS_VALUE;
41 pkt->convergence_duration = 0;
43 pkt->stream_index = 0;
45 pkt->side_data = NULL;
46 pkt->side_data_elems = 0;
49 int av_new_packet(AVPacket *pkt, int size)
52 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
53 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
55 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
62 pkt->destruct = av_destruct_packet;
64 return AVERROR(ENOMEM);
68 void av_shrink_packet(AVPacket *pkt, int size)
70 if (pkt->size <= size)
73 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
76 int av_grow_packet(AVPacket *pkt, int grow_by)
79 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
81 return av_new_packet(pkt, grow_by);
82 if ((unsigned)grow_by >
83 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
85 new_ptr = av_realloc(pkt->data,
86 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
88 return AVERROR(ENOMEM);
91 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
95 #define DUP_DATA(dst, src, size, padding) \
99 if ((unsigned)(size) > \
100 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
102 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
104 data = av_malloc(size); \
108 memcpy(data, src, size); \
110 memset((uint8_t *)data + size, 0, \
111 FF_INPUT_BUFFER_PADDING_SIZE); \
115 int av_dup_packet(AVPacket *pkt)
119 if (pkt->destruct == NULL && pkt->data) {
123 pkt->side_data = NULL;
124 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
125 pkt->destruct = av_destruct_packet;
127 if (pkt->side_data_elems) {
130 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
131 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
132 memset(pkt->side_data, 0,
133 pkt->side_data_elems * sizeof(*pkt->side_data));
134 for (i = 0; i < pkt->side_data_elems; i++)
135 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
136 tmp_pkt.side_data[i].size, 1);
142 av_destruct_packet(pkt);
143 return AVERROR(ENOMEM);
146 void av_free_packet(AVPacket *pkt)
156 for (i = 0; i < pkt->side_data_elems; i++)
157 av_free(pkt->side_data[i].data);
158 av_freep(&pkt->side_data);
159 pkt->side_data_elems = 0;
163 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
166 int elems = pkt->side_data_elems;
168 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
170 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
173 pkt->side_data = av_realloc(pkt->side_data,
174 (elems + 1) * sizeof(*pkt->side_data));
178 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
179 if (!pkt->side_data[elems].data)
181 pkt->side_data[elems].size = size;
182 pkt->side_data[elems].type = type;
183 pkt->side_data_elems++;
185 return pkt->side_data[elems].data;
188 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
193 for (i = 0; i < pkt->side_data_elems; i++) {
194 if (pkt->side_data[i].type == type) {
196 *size = pkt->side_data[i].size;
197 return pkt->side_data[i].data;
203 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
208 for (i = 0; i < pkt->side_data_elems; i++) {
209 if (pkt->side_data[i].type == type) {
210 if (size > pkt->side_data[i].size)
211 return AVERROR(ENOMEM);
212 pkt->side_data[i].size = size;
216 return AVERROR(ENOENT);