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lavf: add internal AVIOContext.maxsize

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This allows simple and generic limiting of allocations used for packets.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-16 05:54:03 +01:00
parent 482ee63641
commit 47572323f2
2 changed files with 15 additions and 1 deletions
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6
libavformat/avio.h
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@ -120,6 +120,12 @@ typedef struct {
* A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
*/
int seekable;
/**
* max filesize, used to limit allocations
* This field is internal to libavformat and access from outside is not allowed.
*/
int64_t maxsize;
} AVIOContext;
/* unbuffered I/O */

10
libavformat/utils.c
View File

@ -267,7 +267,15 @@ AVInputFormat *av_find_input_format(const char *short_name)
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
{
int ret= av_new_packet(pkt, size);
int ret;
if(s->maxsize>0){
int64_t remaining= s->maxsize - avio_tell(s);
if(remaining>=0)
size= FFMIN(size, remaining);
}
ret= av_new_packet(pkt, size);
if(ret<0)
return ret;