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/*
* AVPacket functions for libavcodec
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "libavutil/avassert.h"
void av_destruct_packet_nofree(AVPacket *pkt)
{
pkt->data = NULL; pkt->size = 0;
}
void av_destruct_packet(AVPacket *pkt)
{
av_free(pkt->data);
pkt->data = NULL; pkt->size = 0;
}
void av_init_packet(AVPacket *pkt)
{
pkt->pts = AV_NOPTS_VALUE;
pkt->dts = AV_NOPTS_VALUE;
pkt->pos = -1;
pkt->duration = 0;
pkt->convergence_duration = 0;
pkt->flags = 0;
pkt->stream_index = 0;
pkt->destruct= NULL;
}
int av_new_packet(AVPacket *pkt, int size)
{
uint8_t *data= NULL;
if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (data){
memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}else
size=0;
av_init_packet(pkt);
pkt->data = data;
pkt->size = size;
pkt->destruct = av_destruct_packet;
if(!data)
return AVERROR(ENOMEM);
return 0;
}
void av_shrink_packet(AVPacket *pkt, int size)
{
if (pkt->size <= size) return;
pkt->size = size;
memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
int av_grow_packet(AVPacket *pkt, int grow_by)
{
void *new_ptr;
av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
if (!pkt->size)
return av_new_packet(pkt, grow_by);
if ((unsigned)grow_by > INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
return -1;
new_ptr = av_realloc(pkt->data, pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
if (!new_ptr)
return AVERROR(ENOMEM);
pkt->data = new_ptr;
pkt->size += grow_by;
memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
int av_dup_packet(AVPacket *pkt)
{
if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
uint8_t *data;
/* We duplicate the packet and don't forget to add the padding again. */
if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(ENOMEM);
data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!data) {
return AVERROR(ENOMEM);
}
memcpy(data, pkt->data, pkt->size);
memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
pkt->data = data;
pkt->destruct = av_destruct_packet;
}
return 0;
}
void av_free_packet(AVPacket *pkt)
{
if (pkt) {
if (pkt->destruct) pkt->destruct(pkt);
pkt->data = NULL; pkt->size = 0;
}
}
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