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Optimize memory management to create an av_packet from multiple slices:

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- remove memmove to pack the data, instead copy only the used areas
from the temp buffer in their final position
- use the minimum possible size for the av_packet (relevant when some
slices are missing)

Originally committed as revision 11052 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roberto Togni 2007-11-18 22:40:02 +00:00
parent 289987e454
commit e11d0145e2
1 changed files with 3 additions and 6 deletions
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9
libavformat/rmdec.c
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@ -519,14 +519,11 @@ static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *
rm->remaining_len-= len;
if(type == 2 || (rm->videobufpos) == rm->videobufsize){
//adjust slice headers
memmove(rm->videobuf + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufsize - 1 - 8*rm->slices);
ssize = rm->videobufsize - 8*(rm->slices - rm->cur_slice);
rm->videobuf[0] = rm->cur_slice-1;
if(av_new_packet(pkt, ssize) < 0)
if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, rm->videobuf, ssize);
memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);
memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufpos - 1 - 8*rm->slices);
pkt->pts = AV_NOPTS_VALUE;
pkt->pos = rm->pktpos;
return 0;