avcodec: Add itut-t35 metadata as a codec type

Signed-off-by: Vignesh Venkat <vigneshv@google.com>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2026-06-23.
 
 API changes, most recent first:
 
+2026-07-09 - xxxxxxxxxxx - lavc 63.6.100 - codec_id.h
+  Add AV_CODEC_ID_ITUT_T35.
+
 2026-07-06 - xxxxxxxxxxx - lavc 63.4.100 - bsf.h
   Added graph based experimental bitstream filter API.
   Add AVBitStreamFilterContext, AVBitStreamFilterGraph.

libavcodec/codec_desc.c

@@ -3839,6 +3839,12 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .name      = "smpte_436m_anc",
         .long_name = NULL_IF_CONFIG_SMALL("MXF SMPTE-436M ANC"),
     },
+    {
+        .id        = AV_CODEC_ID_ITUT_T35,
+        .type      = AVMEDIA_TYPE_DATA,
+        .name      = "itut_t35",
+        .long_name = NULL_IF_CONFIG_SMALL("ITU-T T.35 metadata"),
+    },
     {
         .id        = AV_CODEC_ID_MPEG2TS,
         .type      = AVMEDIA_TYPE_DATA,

libavcodec/codec_id.h

@@ -607,6 +607,7 @@ enum AVCodecID {
     AV_CODEC_ID_SMPTE_2038,
     AV_CODEC_ID_LCEVC,
     AV_CODEC_ID_SMPTE_436M_ANC,
+    AV_CODEC_ID_ITUT_T35,
 
 
     AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it

libavcodec/version.h

@@ -29,7 +29,7 @@
 
 #include "version_major.h"
 
-#define LIBAVCODEC_VERSION_MINOR   5
+#define LIBAVCODEC_VERSION_MINOR   6
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \