avformat/avformat: Add AVStream parameter to check_bitstream() sig

For most check_bitstream() functions this just avoids having
to dereference s->streams[pkt->stream_index] themselves; but for
meta-muxers it will allow to forward the packet to stream with
a different stream_index (belonging to a different AVFormatContext)
without using a spare packet.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 0343825aa0..75699f3a32 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -322,6 +322,7 @@
 #include "libavformat/version.h"
 
 struct AVFormatContext;
+struct AVStream;
 
 struct AVDeviceInfoList;
 struct AVDeviceCapabilitiesQuery;
@@ -623,9 +624,13 @@ typedef struct AVOutputFormat {
     /**
      * Set up any necessary bitstream filtering and extract any extra data needed
      * for the global header.
+     *
+     * @note pkt might have been directly forwarded by a meta-muxer; therefore
+     *       pkt->stream_index as well as the pkt's timebase might be invalid.
      * Return 0 if more packets from this stream must be checked; 1 if not.
      */
-    int (*check_bitstream)(struct AVFormatContext *, const AVPacket *pkt);
+    int (*check_bitstream)(struct AVFormatContext *s, struct AVStream *st,
+                           const AVPacket *pkt);
 } AVOutputFormat;
 /**
  * @}