Add AVIO_FLAG_DIRECT.

Allows avoiding the buffer when using avio read, write and seek functions.
When using the ffmpeg executable -avioflags direct can be used to enable
this mode for input files, but has no effect on output files.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

1 files changed, 15 insertions, 0 deletions

diff --git a/libavformat/avio.h b/libavformat/avio.h
index 95f9558c87..0e923fe443 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -121,6 +121,13 @@ typedef struct {
      * This field is internal to libavformat and access from outside is not allowed.
      */
      int64_t maxsize;
+
+     /**
+      * avio_read and avio_write should if possible be satisfied directly
+      * instead of going through a buffer, and avio_seek will always
+      * call the underlying seek function directly.
+      */
+     int direct;
 } AVIOContext;
 
 /* unbuffered I/O */
@@ -320,6 +327,14 @@ int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);
 #define AVIO_FLAG_NONBLOCK 8
 
 /**
+ * Use direct mode.
+ * avio_read and avio_write should if possible be satisfied directly
+ * instead of going through a buffer, and avio_seek will always
+ * call the underlying seek function directly.
+ */
+#define AVIO_FLAG_DIRECT 0x8000
+
+/**
  * Create and initialize a AVIOContext for accessing the
  * resource indicated by url.
  * @note When the resource indicated by url has been opened in