upipe: add uref attribute for SMPTE 12M timecode

Based on a patch by Josh de Kock.

Author: JDarnley

include/upipe/udict.h

@@ -150,7 +150,9 @@ enum udict_type {
     /** p.cea_708 */
     UDICT_TYPE_PIC_CEA_708,
     /** p.bar_data */
-    UDICT_TYPE_PIC_BAR_DATA
+    UDICT_TYPE_PIC_BAR_DATA,
+    /** p.s12m */
+    UDICT_TYPE_PIC_S12M,
 };
 
 /** @This defines standard commands which udict modules may implement. */

include/upipe/uref_pic.h

@@ -58,6 +58,7 @@ UREF_ATTR_VOID_SH(pic, tff, UDICT_TYPE_PIC_TFF, top field first)
 UREF_ATTR_SMALL_UNSIGNED_SH(pic, afd, UDICT_TYPE_PIC_AFD, active format description)
 UREF_ATTR_OPAQUE_SH(pic, cea_708, UDICT_TYPE_PIC_CEA_708, cea-708 captions)
 UREF_ATTR_OPAQUE_SH(pic, bar_data, UDICT_TYPE_PIC_BAR_DATA, afd bar data)
+UREF_ATTR_OPAQUE_SH(pic, s12m, UDICT_TYPE_PIC_S12M, SMPTE 12M timecode compatible with ffmpeg AV_FRAME_DATA_S12M_TIMECODE)
 UREF_ATTR_UNSIGNED(pic, original_height, "p.original_height", original picture height before chunking)
 UREF_ATTR_VOID(pic, c_not_y, "p.c_not_y", whether ancillary data is found in chroma space)
 

lib/upipe/udict_inline.c

@@ -103,6 +103,7 @@ static const struct inline_shorthand inline_shorthands[] = {
     { "p.afd", UDICT_TYPE_SMALL_UNSIGNED },
     { "p.cea_708", UDICT_TYPE_OPAQUE },
     { "p.bar_data", UDICT_TYPE_OPAQUE },
+    { "p.s12m", UDICT_TYPE_OPAQUE },
 };
 
 /** @This stores the size of the value of basic attribute types. */