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