obu: Validate obu_forbidden_bit in sequence header

Section 6.2.2 of AV1 Specification: obu_forbidden_bit must be set to 0.
AOMediaCodec · May 2, 2024 · db8815a · db8815a
1 parent 7be0c35
commit db8815a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/obu.c b/src/obu.c
@@ -413,7 +413,10 @@ avifBool avifSequenceHeaderParse(avifSequenceHeader * header, const avifROData *
         avifBitsInit(&bits, obus.data, obus.size);
 
         // obu_header()
-        avifBitsRead(&bits, 1); // obu_forbidden_bit
+        const uint8_t obu_forbidden_bit = avifBitsRead(&bits, 1);
+        if (obu_forbidden_bit != 0) {
+            return AVIF_FALSE;
+        }
         const uint32_t obu_type = avifBitsRead(&bits, 4);
         const uint32_t obu_extension_flag = avifBitsRead(&bits, 1);
         const uint32_t obu_has_size_field = avifBitsRead(&bits, 1);