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Add a av_grow_packet function, to be used by code that merges

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palette and video data packets to get rid of PaletteControl.

Originally committed as revision 25776 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-11-21 10:21:06 +00:00
parent 1a68e7ed15
commit a08d918e68
2 changed files with 27 additions and 1 deletions
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10
libavcodec/avcodec.h
View File

@ -32,7 +32,7 @@
#include "libavutil/cpu.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 96
#define LIBAVCODEC_VERSION_MINOR 97
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@ -3026,6 +3026,14 @@ int av_new_packet(AVPacket *pkt, int size);
*/
void av_shrink_packet(AVPacket *pkt, int size);
/**
* Increase packet size, correctly zeroing padding
*
* @param pkt packet
* @param grow_by number of bytes by which to increase the size of the packet
*/
int av_grow_packet(AVPacket *pkt, int grow_by);
/**
* @warning This is a hack - the packet memory allocation stuff is broken. The
* packet is allocated if it was not really allocated.

18
libavcodec/avpacket.c
View File

@ -20,6 +20,7 @@
*/
#include "avcodec.h"
#include "libavutil/avassert.h"
void av_destruct_packet_nofree(AVPacket *pkt)
@ -71,6 +72,23 @@ void av_shrink_packet(AVPacket *pkt, int size)
memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
int av_grow_packet(AVPacket *pkt, int grow_by)
{
void *new_ptr;
av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
if (!pkt->size)
return av_new_packet(pkt, grow_by);
if ((unsigned)grow_by > INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
return -1;
new_ptr = av_realloc(pkt->data, pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
if (!new_ptr)
return AVERROR(ENOMEM);
pkt->data = new_ptr;
pkt->size += grow_by;
memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
int av_dup_packet(AVPacket *pkt)
{
if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {