avformat: add avformat_flush()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/APIchanges

@@ -15,6 +15,9 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
+2015-03-04 - xxxxxxx - lavf 56.25.100
+  Add avformat_flush()
+
 2015-03-xx - xxxxxxx - lavf 56.24.100
   Add avio_put_str16be()
 

libavformat/avformat.h

@@ -2136,6 +2136,23 @@ int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
  */
 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
 
+/**
+ * Discard all internally buffered data. This can be useful when dealing with
+ * discontinuities in the byte stream. Generally works only with headerless
+ * formats.
+ *
+ * The set of streams, the detected duration, stream parameters and codecs do
+ * not change when calling this function. If you want a complete reset, it's
+ * better to open a new AVFormatContext.
+ *
+ * This does not flush the AVIOContext (s->pb). If necessary, call
+ * avio_flush(s->pb) before calling this function.
+ *
+ * @param s media file handle
+ * @return >=0 on success, error code otherwise
+ */
+int avformat_flush(AVFormatContext *s);
+
 /**
  * Start playing a network-based stream (e.g. RTSP stream) at the
  * current position.

libavformat/utils.c

@@ -2201,6 +2201,12 @@ int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
     return -1; //unreachable
 }
 
+int avformat_flush(AVFormatContext *s)
+{
+    ff_read_frame_flush(s);
+    return 0;
+}
+
 /*******************************************************/
 
 /**

libavformat/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 56
-#define LIBAVFORMAT_VERSION_MINOR  24
-#define LIBAVFORMAT_VERSION_MICRO 101
+#define LIBAVFORMAT_VERSION_MINOR  25
+#define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \