avcodec/h2645_sei: export raw LCEVC metadata

Signed-off-by: James Almer <jamrial@gmail.com>

Changelog

@@ -24,6 +24,7 @@ version <next>:
 - Vulkan H.264 encoder
 - Vulkan H.265 encoder
 - stream specifiers in fftools can now match by stream disposition
+- LCEVC enhancement data exporting in H.26x
 
 
 version 7.0:

libavcodec/h2645_sei.c

@@ -99,6 +99,20 @@ static int decode_registered_user_data_dynamic_hdr_vivid(HEVCSEIDynamicHDRVivid
 }
 #endif
 
+static int decode_registered_user_data_lcevc(HEVCSEILCEVC *s,
+                                             GetByteContext *gb)
+{
+    int size = bytestream2_get_bytes_left(gb);
+
+    av_buffer_unref(&s->info);
+    s->info = av_buffer_alloc(size);
+    if (!s->info)
+        return AVERROR(ENOMEM);
+
+    bytestream2_get_bufferu(gb, s->info->data, size);
+    return 0;
+}
+
 static int decode_registered_user_data_afd(H2645SEIAFD *h, GetByteContext *gb)
 {
     int flag;
@@ -142,6 +156,7 @@ static int decode_registered_user_data(H2645SEI *h, GetByteContext *gb,
     }
 
     if (country_code != ITU_T_T35_COUNTRY_CODE_US &&
+        country_code != ITU_T_T35_COUNTRY_CODE_UK &&
         country_code != ITU_T_T35_COUNTRY_CODE_CN) {
         av_log(logctx, AV_LOG_VERBOSE,
                "Unsupported User Data Registered ITU-T T35 SEI message (country_code = %d)\n",
@@ -173,6 +188,13 @@ static int decode_registered_user_data(H2645SEI *h, GetByteContext *gb,
         }
         break;
     }
+    case ITU_T_T35_PROVIDER_CODE_LCEVC: {
+        if (bytestream2_get_bytes_left(gb) < 2)
+            return AVERROR_INVALIDDATA;
+
+        bytestream2_skipu(gb, 1); // user_data_type_code
+        return decode_registered_user_data_lcevc(&h->lcevc, gb);
+    }
 #if CONFIG_HEVC_SEI
     case ITU_T_T35_PROVIDER_CODE_CUVA: {
         const uint16_t cuva_provider_oriented_code = 0x0005;
@@ -501,6 +523,10 @@ int ff_h2645_sei_ctx_replace(H2645SEI *dst, const H2645SEI *src)
         av_buffer_unref(&dst->unregistered.buf_ref[i]);
     dst->unregistered.nb_buf_ref = 0;
 
+    ret = av_buffer_replace(&dst->lcevc.info, src->lcevc.info);
+    if (ret < 0)
+        return ret;
+
     if (src->unregistered.nb_buf_ref) {
         ret = av_reallocp_array(&dst->unregistered.buf_ref,
                                 src->unregistered.nb_buf_ref,
@@ -778,6 +804,13 @@ int ff_h2645_sei_to_frame(AVFrame *frame, H2645SEI *sei,
         }
     }
 
+    if (sei->lcevc.info) {
+        HEVCSEILCEVC *lcevc = &sei->lcevc;
+        ret = ff_frame_new_side_data_from_buf(avctx, frame, AV_FRAME_DATA_LCEVC, &lcevc->info);
+        if (ret < 0)
+            return ret;
+    }
+
     if (sei->film_grain_characteristics.present) {
         H2645SEIFilmGrainCharacteristics *fgc = &sei->film_grain_characteristics;
         AVFilmGrainParams *fgp = av_film_grain_params_create_side_data(frame);
@@ -875,6 +908,7 @@ void ff_h2645_sei_reset(H2645SEI *s)
     av_freep(&s->unregistered.buf_ref);
     av_buffer_unref(&s->dynamic_hdr_plus.info);
     av_buffer_unref(&s->dynamic_hdr_vivid.info);
+    av_buffer_unref(&s->lcevc.info);
 
     s->ambient_viewing_environment.present = 0;
     s->mastering_display.present = 0;

libavcodec/h2645_sei.h

@@ -50,6 +50,10 @@ typedef struct HEVCSEIDynamicHDRVivid {
     AVBufferRef *info;
 } HEVCSEIDynamicHDRVivid;
 
+typedef struct HEVCSEILCEVC {
+    AVBufferRef *info;
+} HEVCSEILCEVC;
+
 typedef struct H2645SEIUnregistered {
     AVBufferRef **buf_ref;
     unsigned nb_buf_ref;
@@ -126,6 +130,7 @@ typedef struct H2645SEI {
     H2645SEIAFD afd;
     HEVCSEIDynamicHDRPlus  dynamic_hdr_plus;     //< HEVC only
     HEVCSEIDynamicHDRVivid dynamic_hdr_vivid;    //< HEVC only
+    HEVCSEILCEVC lcevc;
     H2645SEIUnregistered unregistered;
     H2645SEIFramePacking frame_packing;
     H2645SEIDisplayOrientation display_orientation;

libavcodec/itut35.h

@@ -20,11 +20,13 @@
 #define AVCODEC_ITUT35_H
 
 #define ITU_T_T35_COUNTRY_CODE_CN 0x26
+#define ITU_T_T35_COUNTRY_CODE_UK 0xB4
 #define ITU_T_T35_COUNTRY_CODE_US 0xB5
 
 #define ITU_T_T35_PROVIDER_CODE_ATSC  0x31
 #define ITU_T_T35_PROVIDER_CODE_CUVA  0x04
 #define ITU_T_T35_PROVIDER_CODE_DOLBY 0x3B
+#define ITU_T_T35_PROVIDER_CODE_LCEVC 0x50
 #define ITU_T_T35_PROVIDER_CODE_SMTPE 0x3C
 
 #endif /* AVCODEC_ITUT35_H */