mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 01:05:05 +02:00
199 lines
5.6 KiB
C
199 lines
5.6 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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pkt->side_data = NULL;
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pkt->side_data_elems = 0;
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}
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void av_destruct_packet(AVPacket *pkt)
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{
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int i;
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av_free(pkt->data);
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pkt->data = NULL; pkt->size = 0;
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for (i = 0; i < pkt->side_data_elems; i++)
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av_free(pkt->side_data[i].data);
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av_freep(&pkt->side_data);
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pkt->side_data_elems = 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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pkt->side_data = NULL;
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pkt->side_data_elems = 0;
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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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#define DUP_DATA(dst, src, size, padding) \
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do { \
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void *data; \
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if (padding) { \
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if ((unsigned)(size) > (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
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goto failed_alloc; \
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data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
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} else { \
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data = av_malloc(size); \
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} \
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if (!data) \
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goto failed_alloc; \
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memcpy(data, src, size); \
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if (padding) \
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memset((uint8_t*)data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE); \
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dst = data; \
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} while(0)
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int av_dup_packet(AVPacket *pkt)
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{
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AVPacket tmp_pkt;
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if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
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tmp_pkt = *pkt;
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pkt->data = NULL;
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pkt->side_data = NULL;
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DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
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pkt->destruct = av_destruct_packet;
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if (pkt->side_data_elems) {
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int i;
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DUP_DATA(pkt->side_data, tmp_pkt.side_data,
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pkt->side_data_elems * sizeof(*pkt->side_data), 0);
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memset(pkt->side_data, 0, pkt->side_data_elems * sizeof(*pkt->side_data));
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for (i = 0; i < pkt->side_data_elems; i++) {
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DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
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pkt->side_data[i].size, 1);
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}
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}
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}
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return 0;
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failed_alloc:
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av_destruct_packet(pkt);
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return AVERROR(ENOMEM);
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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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pkt->side_data = NULL;
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pkt->side_data_elems = 0;
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}
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}
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uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
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int size)
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{
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int elems = pkt->side_data_elems;
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if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
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return NULL;
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if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
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return NULL;
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pkt->side_data = av_realloc(pkt->side_data, (elems + 1) * sizeof(*pkt->side_data));
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if (!pkt->side_data)
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return NULL;
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pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!pkt->side_data[elems].data)
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return NULL;
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pkt->side_data[elems].size = size;
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pkt->side_data[elems].type = type;
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pkt->side_data_elems++;
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return pkt->side_data[elems].data;
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}
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uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
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int *size)
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{
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int i;
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for (i = 0; i < pkt->side_data_elems; i++) {
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if (pkt->side_data[i].type == type) {
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if (size)
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*size = pkt->side_data[i].size;
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return pkt->side_data[i].data;
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}
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}
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return NULL;
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}
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