| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * 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. |
| * ------------------------------------------------------------------- |
| */ |
| /**************************************************************************************** |
| Portions of this file are derived from the following 3GPP standard: |
| |
| 3GPP TS 26.173 |
| ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) |
| Permission to distribute, modify and use this file under the standard license |
| terms listed above has been obtained from the copyright holder. |
| ****************************************************************************************/ |
| /* |
| ------------------------------------------------------------------------------ |
| |
| |
| |
| Filename: interpolate_isp.cpp |
| |
| Date: 05/08/2004 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| int16 isp_old[], input : isps from past frame |
| int16 isp_new[], input : isps from present frame |
| const int16 frac[], input : fraction for 3 first subfr (Q15) |
| int16 Az[] output: LP coefficients in 4 subframes |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Interpolation of the LP parameters in 4 subframes |
| |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #include "pv_amr_wb_type_defs.h" |
| #include "pvamrwbdecoder_basic_op.h" |
| #include "pvamrwbdecoder_cnst.h" |
| #include "pvamrwbdecoder_acelp.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| #define MP1 (M+1) |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL FUNCTION REFERENCES |
| ; Declare functions defined elsewhere and referenced in this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| void interpolate_isp( |
| int16 isp_old[], /* input : isps from past frame */ |
| int16 isp_new[], /* input : isps from present frame */ |
| const int16 frac[], /* input : fraction for 3 first subfr (Q15) */ |
| int16 Az[] /* output: LP coefficients in 4 subframes */ |
| ) |
| { |
| int16 i, k, fac_old, fac_new; |
| int16 isp[M]; |
| int32 L_tmp; |
| |
| for (k = 0; k < 3; k++) |
| { |
| fac_new = frac[k]; |
| fac_old = add_int16(sub_int16(32767, fac_new), 1); /* 1.0 - fac_new */ |
| |
| for (i = 0; i < M; i++) |
| { |
| L_tmp = mul_16by16_to_int32(isp_old[i], fac_old); |
| L_tmp = mac_16by16_to_int32(L_tmp, isp_new[i], fac_new); |
| isp[i] = amr_wb_round(L_tmp); |
| } |
| Isp_Az(isp, Az, M, 0); |
| Az += MP1; |
| } |
| |
| /* 4th subframe: isp_new (frac=1.0) */ |
| |
| Isp_Az(isp_new, Az, M, 0); |
| |
| return; |
| } |