It is undocumented and has no real use.
---
libavcodec/avcodec.h | 5 +++++
libavcodec/version.h | 3 +++
2 files changed, 8 insertions(+)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 2130ea3..9208d5f 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1081,7 +1081,12 @@ typedef struct AVCodecContext {
enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
const struct AVCodec *codec;
+#if FF_API_CODEC_NAME
+ /**
+ * @deprecated this field is not used for anything in libavcodec
+ */
char codec_name[32];
+#endif
enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
/**
diff --git a/libavcodec/version.h b/libavcodec/version.h
index d82a068..ed3f6a7 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -129,5 +129,8 @@
#ifndef FF_API_ARCH_SPARC
#define FF_API_ARCH_SPARC (LIBAVCODEC_VERSION_MAJOR < 56)
#endif
+#ifndef FF_API_CODEC_NAME
+#define FF_API_CODEC_NAME (LIBAVCODEC_VERSION_MAJOR < 57)
+#endif
#endif /* AVCODEC_VERSION_H */
--
1.7.10.4
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