hevc_nal: retrieve vps/sps/pps id without decoding

modules/packetizer/hevc_nal.c

@@ -290,6 +290,23 @@ static bool hevc_parse_scaling_list_rbsp( bs_t *p_bs )
     return true;
 }
 
+/* Shortcut for retrieving vps/sps/pps id */
+bool hevc_get_xps_id(const uint8_t *p_buf, size_t i_buf, uint8_t *pi_id)
+{
+    if(unlikely(!hxxx_strip_AnnexB_startcode(&p_buf, &i_buf) || i_buf < 3))
+        return false;
+    /* No need to lookup convert from emulation for that data */
+    uint8_t i_nal_type = ((p_buf[0] & 0x7E) >> 1);
+    bs_t bs;
+    bs_init(&bs, &p_buf[2], i_buf - 2);
+    if(i_nal_type == HEVC_NAL_PPS)
+        *pi_id = bs_read_ue( &bs );
+    else
+        *pi_id = bs_read( &bs, 4 );
+
+    return true;
+}
+
 static bool hevc_parse_inner_profile_tier_level_rbsp( bs_t *p_bs,
                                                       hevc_inner_profile_tier_level_t *p_in )
 {

modules/packetizer/hevc_nal.h

@@ -142,5 +142,6 @@ void hevc_rbsp_release_pps( hevc_picture_parameter_set_t * );
 uint8_t * hevc_hvcC_to_AnnexB_NAL( const uint8_t *p_buf, size_t i_buf,
                                    size_t *pi_res, uint8_t *pi_nal_length_size );
 
+bool hevc_get_xps_id(const uint8_t *p_buf, size_t i_buf, uint8_t *pi_id);
 
 #endif /* HEVC_NAL_H */