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Add av_shrink_packet function for use in av_get_packet that reduces pkt->size

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and ensures the following padding is correctly initialized to 0.

Originally committed as revision 18378 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-04-08 20:19:12 +00:00
parent c81604f862
commit feb993e579
3 changed files with 16 additions and 1 deletions
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8
libavcodec/avcodec.h
View File

@ -2654,6 +2654,14 @@ void av_init_packet(AVPacket *pkt);
*/
int av_new_packet(AVPacket *pkt, int size);
/**
* Reduce packet size, correctly zeroing padding
*
* @param pkt packet
* @param size new size
*/
void av_shrink_packet(AVPacket *pkt, int size);
/**
* @warning This is a hack - the packet memory allocation stuff is broken. The
* packet is allocated if it was not really allocated.

7
libavcodec/avpacket.c
View File

@ -62,6 +62,13 @@ int av_new_packet(AVPacket *pkt, int size)
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_dup_packet(AVPacket *pkt)
{
if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {

2
libavformat/utils.c
View File

@ -272,7 +272,7 @@ int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
if(ret<=0)
av_free_packet(pkt);
else
pkt->size= ret;
av_shrink_packet(pkt, ret);
return ret;
}