cbs: Add function to read extradata from an AVCodecContext

This is useful in decoders and parsers, matching the way that bitstream
filters read extradata from AVCodecParameters.

1 files changed, 11 insertions, 0 deletions

diff --git a/libavcodec/cbs.h b/libavcodec/cbs.h
index 635921b11e..3fd0a0ef33 100644
--- a/libavcodec/cbs.h
+++ b/libavcodec/cbs.h
@@ -263,6 +263,17 @@ int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
                           const AVCodecParameters *par);
 
 /**
+ * Read the extradata bitstream found in a codec context into a
+ * fragment, then split into units and decompose.
+ *
+ * This acts identical to ff_cbs_read_extradata() for the case where
+ * you already have a codec context.
+ */
+int ff_cbs_read_extradata_from_codec(CodedBitstreamContext *ctx,
+                                     CodedBitstreamFragment *frag,
+                                     const AVCodecContext *avctx);
+
+/**
  * Read the data bitstream from a packet into a fragment, then
  * split into units and decompose.
  *