[FFmpeg-devel] [PATCH 2/4] avcodec/cbs_h266: add support for Decoding capability information NALU type

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/cbs_h2645.c                | 18 ++++++++++++++++++
 libavcodec/cbs_h266.h                 | 10 ++++++++++
 libavcodec/cbs_h266_syntax_template.c | 24 ++++++++++++++++++++++++
 libavcodec/vvc.h                      |  3 +++
 4 files changed, 55 insertions(+)

diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index 8dc9ae471d..95da597427 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_DCI_NUT:
+        {
+            err = cbs_h266_read_dci(ctx, &gbc, unit->content);
+
+            if (err < 0)
+                return err;
+        }
+        break;
     case VVC_OPI_NUT:
         {
             err = cbs_h266_read_opi(ctx, &gbc, unit->content);
@@ -1601,6 +1609,15 @@ static int cbs_h266_write_nal_unit(CodedBitstreamContext *ctx,
     int err;
 
     switch (unit->type) {
+    case VVC_DCI_NUT:
+        {
+            H266RawDCI *dci = unit->content;
+
+            err = cbs_h266_write_dci(ctx, pbc, dci);
+            if (err < 0)
+                return err;
+        }
+        break;
     case VVC_OPI_NUT:
         {
             H266RawOPI *opi = unit->content;
@@ -1982,6 +1999,7 @@ static void cbs_h266_free_sei(void *opaque, uint8_t *content)
 }
 
 static const CodedBitstreamUnitTypeDescriptor cbs_h266_unit_types[] = {
+    CBS_UNIT_TYPE_INTERNAL_REF(VVC_DCI_NUT, H266RawDCI, extension_data.data),
     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),
diff --git a/libavcodec/cbs_h266.h b/libavcodec/cbs_h266.h
index 693d1ca1fd..87aa2d849d 100644
--- a/libavcodec/cbs_h266.h
+++ b/libavcodec/cbs_h266.h
@@ -241,6 +241,16 @@ typedef struct H266RawOPI {
     H266RawExtensionData extension_data;
 } H266RawOPI;
 
+typedef struct H266RawDCI {
+    H266RawNALUnitHeader nal_unit_header;
+
+    uint8_t dci_reserved_zero_4bits;
+    uint8_t dci_num_ptls_minus1;
+    H266RawProfileTierLevel dci_profile_tier_level[VVC_MAX_DCI_PTLS];
+    uint8_t dci_extension_flag;
+    H266RawExtensionData extension_data;
+} H266RawDCI;
+
 typedef struct H266RawVPS {
     H266RawNALUnitHeader nal_unit_header;
 
diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
index d9c8e0afbe..4ea29ec789 100644
--- a/libavcodec/cbs_h266_syntax_template.c
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -650,6 +650,30 @@ static int FUNC(opi)(CodedBitstreamContext *ctx, RWContext *rw,
     return 0;
 }
 
+static int FUNC(dci)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawDCI *current)
+{
+    int err, i;
+
+    HEADER("Decoding capability information");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw,
+                                &current->nal_unit_header, VVC_DCI_NUT));
+
+    ub(4, dci_reserved_zero_4bits);
+    ub(4, dci_num_ptls_minus1);
+    for (i = 0; i <= current->dci_num_ptls_minus1; i++)
+        CHECK(FUNC(profile_tier_level)(ctx, rw,
+                                       current->dci_profile_tier_level + i, 1, 0));
+
+    flag(dci_extension_flag);
+    if (current->dci_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)
 {
diff --git a/libavcodec/vvc.h b/libavcodec/vvc.h
index 099d2fc2ad..eda1b40eef 100644
--- a/libavcodec/vvc.h
+++ b/libavcodec/vvc.h
@@ -76,6 +76,9 @@ enum {
     //7.4.3.3 The value of vps_max_sublayers_minus1 shall be in the range of 0 to 6, inclusive
     VVC_MAX_SUBLAYERS = 7,
 
+    //7.3.2.1 dci_num_ptls_minus1 is u(4)
+    VVC_MAX_DCI_PTLS = 16,
+
     //7.4.3.3 vps_num_ptls_minus1 is u(8)
     VVC_MAX_PTLS = 256,
 
-- 
2.41.0

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