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diff --git a/decoder/ixheaacd_mps_res_tns.h b/decoder/ixheaacd_mps_res_tns.h
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+++ b/decoder/ixheaacd_mps_res_tns.h
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+/******************************************************************************
+ *
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *****************************************************************************
+ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
+*/
+#ifndef IXHEAACD_MPS_RES_TNS_H
+#define IXHEAACD_MPS_RES_TNS_H
+
+VOID ixheaacd_res_ctns_apply(ia_mps_dec_residual_channel_info_struct *p_aac_decoder_channel_info,
+                             WORD16 max_sfb,
+                             ia_mps_dec_residual_aac_tables_struct *aac_tables_ptr);
+
+WORD16
+ixheaacd_res_c_tns_read(ia_bit_buf_struct *it_bit_buf,
+                        ia_mps_dec_residual_channel_info_struct *p_aac_decoder_channel_info);
+
+WORD32 ixheaacd_res_calc_max_spectral_line(WORD32 *p_tmp, WORD32 size);
+
+VOID ixheaacd_res_tns_parcor_2_lpc_32x16(WORD16 *parcor, WORD16 *lpc, WORD16 *scale, WORD order);
+
+VOID ixheaacd_res_tns_ar_filter_fixed_32x16(WORD32 *spectrum, WORD32 size, WORD32 inc,
+                                            WORD16 *lpc, WORD32 order, WORD32 shift_value,
+                                            WORD scale_spec);
+
+#endif /* IXHEAACD_MPS_RES_TNS_H */