avcodec/packet: add AV_PKT_DATA_HEVC_CONF side data type

Carries a raw HEVCDecoderConfigurationRecord for the Dolby Vision
enhancement layer, parsed from the hvcE box (ISOM) or the corresponding
BlockAdditionMapping (Matroska).

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
 
 API changes, most recent first:
 
+2026-05-xx - xxxxxxxxxx - lavc 62.35.100 - packet.h
+  Add AV_PKT_DATA_HEVC_CONF side data type.
+
 2026-05-14 - xxxxxxxxxxx - lavf 62.18.100 - avformat.h
   Add AV_FDEBUG_ID3V2 debug flag, deprecate FF_FDEBUG_TS in favor of
   AV_FDEBUG_TS.

libavcodec/packet.c

@@ -311,6 +311,7 @@ const char *av_packet_side_data_name(enum AVPacketSideDataType type)
     case AV_PKT_DATA_3D_REFERENCE_DISPLAYS:      return "3D Reference Displays Info";
     case AV_PKT_DATA_RTCP_SR:                    return "RTCP Sender Report";
     case AV_PKT_DATA_EXIF:                       return "EXIF metadata";
+    case AV_PKT_DATA_HEVC_CONF:                  return "HEVC enhancement-layer decoder configuration";
     }
     return NULL;
 }

libavcodec/packet.h

@@ -375,6 +375,14 @@ enum AVPacketSideDataType {
      */
     AV_PKT_DATA_DYNAMIC_HDR_SMPTE_2094_APP5,
 
+    /**
+     * Dolby Vision enhancement-layer HEVC decoder configuration.
+     * Parsed from the @c hvcE box in ISOM-based containers or the
+     * corresponding BlockAdditionMapping in Matroska. The data is a raw
+     * HEVCDecoderConfigurationRecord as defined in ISO 14496-15.
+     */
+    AV_PKT_DATA_HEVC_CONF,
+
     /**
      * The number of side data types.
      * This is not part of the public API/ABI in the sense that it may

libavcodec/version.h

@@ -29,8 +29,8 @@
 
 #include "version_major.h"
 
-#define LIBAVCODEC_VERSION_MINOR  34
-#define LIBAVCODEC_VERSION_MICRO 102
+#define LIBAVCODEC_VERSION_MINOR  35
+#define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \