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ffmpeg / libavcodec / avpacket.c @ a0b468f5

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/*
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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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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_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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}