[FFmpeg-devel] [PATCH 2/2] avcodec/bsf: Beautify log messages from bitstream filters

[Andreas Rheinhardt]

Up until now, the name of every AVBSFContext for logging purposes was
"AVBSFContext", so that the default logging callback produced output
like "[AVBSFContext @ 0x55813bae92c0] Extradata". This has been changed
to "[trace_headers @ 0x60a000000700] Extradata" by adding an item_name-
function to the AVClass for bitstream filters.

Furthermore, the correct category has been set so that the introductory
part before the actual message (everything before "Extradata" in the
above examples) are displayed in a different colour than the rest.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
---
 libavcodec/bsf.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c
index d0e0d46068..7b96183e64 100644
--- a/libavcodec/bsf.c
+++ b/libavcodec/bsf.c
@@ -64,12 +64,18 @@ static void *bsf_child_next(void *obj, void *prev)
     return NULL;
 }
 
+static const char *bsf_to_name(void *bsf)
+{
+    return ((AVBSFContext *)bsf)->filter->name;
+}
+
 static const AVClass bsf_class = {
     .class_name       = "AVBSFContext",
-    .item_name        = av_default_item_name,
+    .item_name        = bsf_to_name,
     .version          = LIBAVUTIL_VERSION_INT,
     .child_next       = bsf_child_next,
     .child_class_next = ff_bsf_child_class_next,
+    .category         = AV_CLASS_CATEGORY_BITSTREAM_FILTER,
 };
 
 const AVClass *av_bsf_get_class(void)
-- 
2.20.1