From c84778a4e1e6a1123d117482a81fe925325ac010 Mon Sep 17 00:00:00 2001
From: Michal Sojka <sojkam1@fel.cvut.cz>
Date: Fri, 9 Apr 2010 16:12:10 +0200
Subject: [PATCH] Prepare for O_DIRECT

---
 libavformat/avio.h |  1 +
 libavformat/file.c | 26 +++++++++++++++++++++-----
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/libavformat/avio.h b/libavformat/avio.h
index be02b06f6..3340a12cd 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -64,6 +64,7 @@ typedef struct URLPollEntry {
 #define URL_RDONLY 0
 #define URL_WRONLY 1
 #define URL_RDWR   2
+#define URL_DIRECT 2		/* Use O_DIRECT for file access */
 
 typedef int URLInterruptCB(void);
 
diff --git a/libavformat/file.c b/libavformat/file.c
index da0ce1509..c041e562a 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define _GNU_SOURCE
 #include "libavutil/avstring.h"
 #include "avformat.h"
 #include <fcntl.h>
@@ -33,8 +34,13 @@
 
 /* standard file protocol */
 
+struct FileContext {
+    int fd;
+};
+
 static int file_open(URLContext *h, const char *filename, int flags)
 {
+    struct FileContext *s = h->priv_data;
     int access;
     int fd;
 
@@ -50,35 +56,45 @@ static int file_open(URLContext *h, const char *filename, int flags)
 #ifdef O_BINARY
     access |= O_BINARY;
 #endif
+    s = av_malloc(sizeof(struct FileContext));
+    if (!s)
+	return AVERROR(ENOMEM);
+    if (flags & URL_DIRECT)
+	access |= O_DIRECT;
     fd = open(filename, access, 0666);
     if (fd < 0)
         return AVERROR(ENOENT);
-    h->priv_data = (void *) (intptr_t) fd;
+    s->fd = fd;
+    h->priv_data = (void *) s;
     return 0;
 }
 
 static int file_read(URLContext *h, unsigned char *buf, int size)
 {
-    int fd = (intptr_t) h->priv_data;
+    struct FileContext *s = h->priv_data;
+    int fd = s->fd;
     return read(fd, buf, size);
 }
 
 static int file_write(URLContext *h, unsigned char *buf, int size)
 {
-    int fd = (intptr_t) h->priv_data;
+    struct FileContext *s = h->priv_data;
+    int fd = s->fd;
     return write(fd, buf, size);
 }
 
 /* XXX: use llseek */
 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
 {
-    int fd = (intptr_t) h->priv_data;
+    struct FileContext *s = h->priv_data;
+    int fd = s->fd;
     return lseek(fd, pos, whence);
 }
 
 static int file_close(URLContext *h)
 {
-    int fd = (intptr_t) h->priv_data;
+    struct FileContext *s = h->priv_data;
+    int fd = s->fd;
     return close(fd);
 }
 
-- 
2.39.2