lavf: allow custom IO for all files

Some (de)muxers open additional files beyond the main IO context.
Currently, they call avio_open() directly, which prevents the caller
from using custom IO for such streams.

This commit adds callbacks to AVFormatContext that default to
avio_open2()/avio_close(), but can be overridden by the caller. All
muxers and demuxers using AVIO are switched to using those callbacks
instead of calling avio_open()/avio_close() directly.

(de)muxers that use the URLProtocol layer directly instead of AVIO
remain unconverted for now. This should be fixed in later commits.

1 files changed, 6 insertions, 0 deletions

diff --git a/libavformat/internal.h b/libavformat/internal.h
index 17c45f6dab..ed9893033a 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -419,4 +419,10 @@ static inline int ff_rename(const char *oldpath, const char *newpath)
     return 0;
 }
 
+/**
+ * A wrapper around AVFormatContext.io_close that should be used
+ * intead of calling the pointer directly.
+ */
+void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
+
 #endif /* AVFORMAT_INTERNAL_H */