hxxx_nal: add nal to rbsp conversion helpers

modules/packetizer/hxxx_nal.h

@@ -74,4 +74,21 @@ static inline uint8_t * hxxx_ep3b_to_rbsp(const uint8_t *p_src, size_t i_src, si
     return p_dst;
 }
 
+static inline uint8_t * hxxx_AnnexB_NAL_to_rbsp(const uint8_t *p_src, size_t i_src, size_t *pi_ret)
+{
+    if(!hxxx_strip_AnnexB_startcode(&p_src, &i_src))
+        return NULL;
+    return hxxx_ep3b_to_rbsp(p_src, i_src, pi_ret);
+}
+
+static inline uint8_t * hxxx_xvc1_NAL_to_rbsp(const uint8_t *p_src, size_t i_src,
+                                              uint8_t i_nal_length_size, size_t *pi_ret)
+{
+    if(i_src < i_nal_length_size)
+        return NULL;
+    p_src += i_nal_length_size;
+    i_src -= i_nal_length_size;
+    return hxxx_ep3b_to_rbsp(p_src, i_src, pi_ret);
+}
+
 #endif // HXXX_NAL_H