| /* ------------------------------------------------------------------ |
| * 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: isp_isf.cpp |
| |
| Date: 05/08/2004 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| int16 isf[], (i) Q15 : isf[m] normalized (range: 0.0<=val<=0.5) |
| int16 isp[], (o) Q15 : isp[m] (range: -1<=val<1) |
| int16 m (i) : LPC order |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Isf_isp Transformation isf to isp |
| |
| The transformation from isf[i] to isp[i] is |
| approximated by a look-up table and interpolation. |
| |
| |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| |
| #include "pv_amr_wb_type_defs.h" |
| #include "pvamrwbdecoder_basic_op.h" |
| #include "pvamrwbdecoder_acelp.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /* Look-up table for transformations */ |
| |
| /* table of cos(x) in Q15 */ |
| |
| static const int16 table[129] = |
| { |
| 32767, |
| 32758, 32729, 32679, 32610, 32522, 32413, 32286, 32138, |
| 31972, 31786, 31581, 31357, 31114, 30853, 30572, 30274, |
| 29957, 29622, 29269, 28899, 28511, 28106, 27684, 27246, |
| 26791, 26320, 25833, 25330, 24812, 24279, 23732, 23170, |
| 22595, 22006, 21403, 20788, 20160, 19520, 18868, 18205, |
| 17531, 16846, 16151, 15447, 14733, 14010, 13279, 12540, |
| 11793, 11039, 10279, 9512, 8740, 7962, 7180, 6393, |
| 5602, 4808, 4011, 3212, 2411, 1608, 804, 0, |
| -804, -1608, -2411, -3212, -4011, -4808, -5602, -6393, |
| -7180, -7962, -8740, -9512, -10279, -11039, -11793, -12540, |
| -13279, -14010, -14733, -15447, -16151, -16846, -17531, -18205, |
| -18868, -19520, -20160, -20788, -21403, -22006, -22595, -23170, |
| -23732, -24279, -24812, -25330, -25833, -26320, -26791, -27246, |
| -27684, -28106, -28511, -28899, -29269, -29622, -29957, -30274, |
| -30572, -30853, -31114, -31357, -31581, -31786, -31972, -32138, |
| -32286, -32413, -32522, -32610, -32679, -32729, -32758, -32768 |
| }; |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 Isf_isp( |
| int16 isf[], /* (i) Q15 : isf[m] normalized (range: 0.0<=val<=0.5) */ |
| int16 isp[], /* (o) Q15 : isp[m] (range: -1<=val<1) */ |
| int16 m /* (i) : LPC order */ |
| ) |
| { |
| int16 i, ind, offset; |
| int32 L_tmp; |
| |
| for (i = 0; i < m - 1; i++) |
| { |
| isp[i] = isf[i]; |
| } |
| isp[m - 1] = shl_int16(isf[m - 1], 1); |
| |
| for (i = 0; i < m; i++) |
| { |
| ind = isp[i] >> 7; /* ind = b7-b15 of isf[i] */ |
| offset = (isp[i] & 0x007f); /* offset = b0-b6 of isf[i] */ |
| |
| /* isp[i] = table[ind]+ ((table[ind+1]-table[ind])*offset) / 128 */ |
| |
| L_tmp = mul_16by16_to_int32(table[ind + 1] - table[ind], offset); |
| isp[i] = add_int16(table[ind], (int16)(L_tmp >> 8)); |
| } |
| |
| return; |
| } |
