[FFmpeg-cvslog] avcodec/bsf: Use null-bsf for passthrough when available

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Mon Sep  6 19:39:19 2021 +0200| [b99fb4df42871e16077c3248ab9cfd8cfd034a85] | committer: Andreas Rheinhardt

avcodec/bsf: Use null-bsf for passthrough when available

When an empty list bsf is used for passthrough, there is a check
for every packet in bsf_list_filter() before ff_bsf_get_packet_ref()
is called. Directly using the null bsf avoids that.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b99fb4df42871e16077c3248ab9cfd8cfd034a85
---

 libavcodec/bsf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c
index d9c8395260..62fe7ae5e8 100644
--- a/libavcodec/bsf.c
+++ b/libavcodec/bsf.c
@@ -18,6 +18,8 @@
 
 #include <string.h>
 
+#include "config.h"
+
 #include "libavutil/avassert.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
@@ -544,5 +546,10 @@ end:
 
 int av_bsf_get_null_filter(AVBSFContext **bsf)
 {
+#if CONFIG_NULL_BSF
+    extern const AVBitStreamFilter ff_null_bsf;
+    return av_bsf_alloc(&ff_null_bsf, bsf);
+#else
     return av_bsf_alloc(&list_bsf, bsf);
+#endif
 }