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"
26 void av_destruct_packet_nofree(AVPacket *pkt)
28 pkt->data = NULL; pkt->size = 0;
31 void av_destruct_packet(AVPacket *pkt)
34 pkt->data = NULL; pkt->size = 0;
37 void av_init_packet(AVPacket *pkt)
39 pkt->pts = AV_NOPTS_VALUE;
40 pkt->dts = AV_NOPTS_VALUE;
43 pkt->convergence_duration = 0;
45 pkt->stream_index = 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) return;
72 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
75 int av_grow_packet(AVPacket *pkt, int grow_by)
78 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
80 return av_new_packet(pkt, grow_by);
81 if ((unsigned)grow_by > INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
83 new_ptr = av_realloc(pkt->data, pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
85 return AVERROR(ENOMEM);
88 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
92 int av_dup_packet(AVPacket *pkt)
94 if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
96 /* We duplicate the packet and don't forget to add the padding again. */
97 if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
98 return AVERROR(ENOMEM);
99 data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
101 return AVERROR(ENOMEM);
103 memcpy(data, pkt->data, pkt->size);
104 memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
106 pkt->destruct = av_destruct_packet;
111 void av_free_packet(AVPacket *pkt)
114 if (pkt->destruct) pkt->destruct(pkt);
115 pkt->data = NULL; pkt->size = 0;