From 6cb57bb457ebf544d311676bead7f1112ac9f8a9 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Sun, 2 Jul 2023 20:26:19 -0300
Subject: [PATCH] avcodec/cbs_h266: add support for Operating point information
 NALU type

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/cbs_h2645.c                | 18 ++++++++++++++++++
 libavcodec/cbs_h266.h                 | 11 +++++++++++
 libavcodec/cbs_h266_syntax_template.c | 27 +++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index 68ccf6a7eb..8dc9ae471d 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -1059,6 +1059,14 @@ static int cbs_h266_read_nal_unit(CodedBitstreamContext *ctx,
         return err;
 
     switch (unit->type) {
+    case VVC_OPI_NUT:
+        {
+            err = cbs_h266_read_opi(ctx, &gbc, unit->content);
+
+            if (err < 0)
+                return err;
+        }
+        break;
     case VVC_VPS_NUT:
         {
             H266RawVPS *vps = unit->content;
@@ -1593,6 +1601,15 @@ static int cbs_h266_write_nal_unit(CodedBitstreamContext *ctx,
     int err;
 
     switch (unit->type) {
+    case VVC_OPI_NUT:
+        {
+            H266RawOPI *opi = unit->content;
+
+            err = cbs_h266_write_opi(ctx, pbc, opi);
+            if (err < 0)
+                return err;
+        }
+        break;
     case VVC_VPS_NUT:
         {
             H266RawVPS *vps = unit->content;
@@ -1965,6 +1982,7 @@ static void cbs_h266_free_sei(void *opaque, uint8_t *content)
 }
 
 static const CodedBitstreamUnitTypeDescriptor cbs_h266_unit_types[] = {
+    CBS_UNIT_TYPE_INTERNAL_REF(VVC_OPI_NUT, H266RawOPI, extension_data.data),
     CBS_UNIT_TYPE_INTERNAL_REF(VVC_VPS_NUT, H266RawVPS, extension_data.data),
     CBS_UNIT_TYPE_INTERNAL_REF(VVC_SPS_NUT, H266RawSPS, extension_data.data),
     CBS_UNIT_TYPE_INTERNAL_REF(VVC_PPS_NUT, H266RawPPS, extension_data.data),
diff --git a/libavcodec/cbs_h266.h b/libavcodec/cbs_h266.h
index 9e211b293f..19eed3dc8e 100644
--- a/libavcodec/cbs_h266.h
+++ b/libavcodec/cbs_h266.h
@@ -230,6 +230,17 @@ typedef struct H266RawVUI {
     H266RawExtensionData extension_data;
 } H266RawVUI;
 
+typedef struct H266RawOPI {
+    H266RawNALUnitHeader nal_unit_header;
+
+    uint8_t opi_ols_info_present_flag;
+    uint8_t opi_htid_info_present_flag;
+    uint16_t opi_ols_idx;
+    uint8_t opi_htid_plus1;
+    uint8_t opi_extension_flag;
+    H266RawExtensionData extension_data;
+} H266RawOPI;
+
 typedef struct H266RawVPS {
     H266RawNALUnitHeader nal_unit_header;
 
diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
index 7d69593b82..9537461ddd 100644
--- a/libavcodec/cbs_h266_syntax_template.c
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -623,6 +623,33 @@ static int FUNC(ols_timing_hrd_parameters) (CodedBitstreamContext *ctx,
     return 0;
 }
 
+static int FUNC(opi)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawOPI *current)
+{
+    int err;
+
+    HEADER("Operating point information");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw,
+                                &current->nal_unit_header, VVC_OPI_NUT));
+
+    flag(opi_ols_info_present_flag);
+    flag(opi_htid_info_present_flag);
+
+    if(current->opi_ols_info_present_flag)
+        ue(opi_ols_idx, 0, VVC_MAX_TOTAL_NUM_OLSS - 1);
+
+    if(current->opi_htid_info_present_flag)
+        ub(3, opi_htid_plus1);
+
+    flag(opi_extension_flag);
+    if (current->opi_extension_flag)
+        CHECK(FUNC(extension_data) (ctx, rw, &current->extension_data));
+    CHECK(FUNC(rbsp_trailing_bits) (ctx, rw));
+
+    return 0;
+}
+
 static int FUNC(vps) (CodedBitstreamContext *ctx, RWContext *rw,
                      H266RawVPS *current)
 {