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)
36 for (i = 0; i < pkt->side_data_elems; i++)
37 av_free(pkt->side_data[i].data);
38 av_freep(&pkt->side_data);
39 pkt->side_data_elems = 0;
42 void av_init_packet(AVPacket *pkt)
44 pkt->pts = AV_NOPTS_VALUE;
45 pkt->dts = AV_NOPTS_VALUE;
48 pkt->convergence_duration = 0;
50 pkt->stream_index = 0;
52 pkt->side_data = NULL;
53 pkt->side_data_elems = 0;
56 int av_new_packet(AVPacket *pkt, int size)
59 if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
60 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
62 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
69 pkt->destruct = av_destruct_packet;
71 return AVERROR(ENOMEM);
75 void av_shrink_packet(AVPacket *pkt, int size)
77 if (pkt->size <= size)
80 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
83 int av_grow_packet(AVPacket *pkt, int grow_by)
86 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
88 return av_new_packet(pkt, grow_by);
89 if ((unsigned)grow_by >
90 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
92 new_ptr = av_realloc(pkt->data,
93 pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
95 return AVERROR(ENOMEM);
98 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
102 #define DUP_DATA(dst, src, size, padding) \
106 if ((unsigned)(size) > \
107 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
109 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
111 data = av_malloc(size); \
115 memcpy(data, src, size); \
117 memset((uint8_t *)data + size, 0, \
118 FF_INPUT_BUFFER_PADDING_SIZE); \
122 int av_dup_packet(AVPacket *pkt)
126 if (pkt->destruct == NULL && pkt->data) {
130 pkt->side_data = NULL;
131 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
132 pkt->destruct = av_destruct_packet;
134 if (pkt->side_data_elems) {
137 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
138 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
139 memset(pkt->side_data, 0,
140 pkt->side_data_elems * sizeof(*pkt->side_data));
141 for (i = 0; i < pkt->side_data_elems; i++)
142 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
143 tmp_pkt.side_data[i].size, 1);
149 av_destruct_packet(pkt);
150 return AVERROR(ENOMEM);
153 void av_free_packet(AVPacket *pkt)
160 pkt->side_data = NULL;
161 pkt->side_data_elems = 0;
165 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
168 int elems = pkt->side_data_elems;
170 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
172 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
175 pkt->side_data = av_realloc(pkt->side_data,
176 (elems + 1) * sizeof(*pkt->side_data));
180 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
181 if (!pkt->side_data[elems].data)
183 pkt->side_data[elems].size = size;
184 pkt->side_data[elems].type = type;
185 pkt->side_data_elems++;
187 return pkt->side_data[elems].data;
190 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
195 for (i = 0; i < pkt->side_data_elems; i++) {
196 if (pkt->side_data[i].type == type) {
198 *size = pkt->side_data[i].size;
199 return pkt->side_data[i].data;
205 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
210 for (i = 0; i < pkt->side_data_elems; i++) {
211 if (pkt->side_data[i].type == type) {
212 if (size > pkt->side_data[i].size)
213 return AVERROR(ENOMEM);
214 pkt->side_data[i].size = size;
218 return AVERROR(ENOENT);