Add a new function av_codec_get_tag2().

av_codec_get_tag() may return 0 both in case a codec_tag was
found and if no codec_tag was found.
The new function does not have this ambiguity.

1 files changed, 12 insertions, 0 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index c907d4e961..8330c6b61b 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1930,6 +1930,18 @@ enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned i
  */
 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
 
+/**
+ * Get the codec tag for the given codec id.
+ *
+ * @param tags list of supported codec_id - codec_tag pairs, as stored
+ * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
+ * @param id codec id that should be searched for in the list
+ * @param tag A pointer to the found tag
+ * @return 0 if id was not found in tags, > 0 if it was found
+ */
+int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
+                      unsigned int *tag);
+
 int av_find_default_stream_index(AVFormatContext *s);
 
 /**