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avformat/cache: avoid lseek() on reading from the cache if possible

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-26 01:23:54 +01:00
parent ce3551896a
commit 312151bb9a
1 changed files with 6 additions and 2 deletions
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8
libavformat/cache.c
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@ -156,8 +156,12 @@ static int cache_read(URLContext *h, unsigned char *buf, int size)
av_assert0(entry->logical_pos <= c->logical_pos);
if (in_block_pos < entry->size) {
int64_t physical_target = entry->physical_pos + in_block_pos;
//FIXME avoid seek if unneeded
r = lseek(c->fd, physical_target, SEEK_SET);
if (c->cache_pos != physical_target) {
r = lseek(c->fd, physical_target, SEEK_SET);
} else
r = c->cache_pos;
if (r >= 0) {
c->cache_pos = r;
r = read(c->fd, buf, FFMIN(size, entry->size - in_block_pos));