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Implement support to the AVSEEK_SIZE operation in file_seek().

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Avoid the need to use seeking for getting the file size, use fstat
instead, which is significantly faster.

See thread:
Subject: [FFmpeg-devel] [PATCH] Add support to AVSEEK_SIZE to the file protocol seek callback
Date: Fri, 2 Apr 2010 13:13:27 +0200

Originally committed as revision 22799 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-04-04 14:21:29 +00:00
parent 685598f58d
commit 5b33a55376
1 changed files with 6 additions and 2 deletions
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8
libavformat/file.c
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@ -26,6 +26,7 @@
#include <io.h> #include <io.h>
#endif #endif
#include <unistd.h> #include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h> #include <sys/time.h>
#include <stdlib.h> #include <stdlib.h>
#include "os_support.h" #include "os_support.h"
@ -73,8 +74,11 @@ static int file_write(URLContext *h, unsigned char *buf, int size)
static int64_t file_seek(URLContext *h, int64_t pos, int whence) static int64_t file_seek(URLContext *h, int64_t pos, int whence)
{ {
int fd = (intptr_t) h->priv_data; int fd = (intptr_t) h->priv_data;
if (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) if (whence == AVSEEK_SIZE) {
return AVERROR_NOTSUPP; struct stat st;
int ret = fstat(fd, &st);
return ret < 0 ? AVERROR(errno) : st.st_size;
}
return lseek(fd, pos, whence); return lseek(fd, pos, whence);
} }