avformat/{isom,mov,movenc}: add support for CMAF DASH roles

This information is coded in a standard MP4 KindBox and utilizes the
scheme and values as per the DASH role scheme defined in MPEG-DASH.
Other schemes are technically allowed, but where multiple schemes
define the same concepts, the DASH scheme should be utilized.

Such flagging is additionally utilized by the DASH-IF CMAF ingest
specification, enabling an encoder to inform the following component
of the roles of the incoming media streams.

A test is added for this functionality in a similar manner to the
matroska test.

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/libavformat/isom.h b/libavformat/isom.h
index 34a58c79b7..c62fcf2bfe 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -390,4 +390,16 @@ static inline enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
 #define MOV_ISMV_TTML_TAG MKTAG('d', 'f', 'x', 'p')
 #define MOV_MP4_TTML_TAG  MKTAG('s', 't', 'p', 'p')
 
+struct MP4TrackKindValueMapping {
+    int         disposition;
+    const char *value;
+};
+
+struct MP4TrackKindMapping {
+    const char   *scheme_uri;
+    const struct  MP4TrackKindValueMapping *value_maps;
+};
+
+extern const struct MP4TrackKindMapping ff_mov_track_kind_table[];
+
 #endif /* AVFORMAT_ISOM_H */