avcodec/bsf: Add FFBitStreamFilter, hide internals of BSFs

This patch is analogous to 20f972701806be20a77f808db332d9489343bb78:
It hides the internal part of AVBitStreamFilter by adding a new
internal structure FFBitStreamFilter (declared in bsf_internal.h)
that has an AVBitStreamFilter as its first member; the internal
part of AVBitStreamFilter is moved to this new structure.

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

1 files changed, 13 insertions, 0 deletions

diff --git a/libavcodec/bsf_internal.h b/libavcodec/bsf_internal.h
index 06979fdaa3..922b03c01b 100644
--- a/libavcodec/bsf_internal.h
+++ b/libavcodec/bsf_internal.h
@@ -24,6 +24,19 @@
 #include "bsf.h"
 #include "packet.h"
 
+typedef struct FFBitStreamFilter {
+    /**
+     * The public AVBitStreamFilter. See bsf.h for it.
+     */
+    AVBitStreamFilter p;
+
+    int priv_data_size;
+    int (*init)(AVBSFContext *ctx);
+    int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
+    void (*close)(AVBSFContext *ctx);
+    void (*flush)(AVBSFContext *ctx);
+} FFBitStreamFilter;
+
 /**
  * Called by the bitstream filters to get the next packet for filtering.
  * The filter is responsible for either freeing the packet or passing it to the