avformat/aviobuf: Add function to reset dynamic buffer

Resetting a dynamic buffer means to keep the AVIOContext and the
internal buffer used by the dynamic buffer. This is done in order to
save (re)allocations when one has a workflow where one opens and closes
dynamic buffers in sequence.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index eb628ac493..c575df8035 100644
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -172,6 +172,13 @@ int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
 int ffio_close_null_buf(AVIOContext *s);
 
 /**
+ * Reset a dynamic buffer.
+ *
+ * Resets everything, but keeps the allocated buffer for later use.
+ */
+void ffio_reset_dyn_buf(AVIOContext *s);
+
+/**
  * Free a dynamic buffer.
  *
  * @param s a pointer to an IO context opened by avio_open_dyn_buf()