| /* ------------------------------------------------------------------ |
| * 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 26.073 |
| ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2004, 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. |
| ****************************************************************************************/ |
| /* |
| Pathname: ./audio/gsm-amr/c/src/int_lpc.c |
| Functions: |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Updated template used to PV coding template. |
| Changed to accept the pOverflow flag for EPOC compatibility. |
| |
| Description: Per review comments, replaced includes of "basic_op.h" |
| and "count.h" with "shr.h", "sub.h", and "add.h" |
| |
| Description: For Int_lpc_1and3() and Int_lpc_1and3_2() |
| 1. Replaced array addressing by pointers |
| 2. Eliminated math operations that unnecessary checked for |
| saturation |
| 3. Unrolled loops to speed up processing |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| |
| Who: Date: |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| MODULE DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "int_lpc.h" |
| #include "typedef.h" |
| #include "cnst.h" |
| #include "lsp_az.h" |
| #include "basic_op.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 VARIABLE DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: Int_lpc_1and3 |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| lsp_old -- array of type Word16 -- LSP vector at the |
| 4th subfr. of past frame (M) |
| lsp_mid -- array of type Word16 -- LSP vector at the 2nd subfr. of |
| present frame (M) |
| lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of |
| present frame (M) |
| |
| Outputs: |
| Az -- array of type Word16 -- interpolated LP parameters in all subfr. |
| (AZ_SIZE) |
| pOverflow -- pointer to type Flag -- Overflow indicator |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Purpose : Interpolates the LSPs and converts to LPC parameters |
| to get a different LP filter in each subframe. |
| Description : The 20 ms speech frame is divided into 4 subframes. |
| The LSPs are quantized and transmitted at the 2nd and |
| 4th subframes (twice per frame) and interpolated at the |
| 1st and 3rd subframe. |
| |
| |------|------|------|------| |
| sf1 sf2 sf3 sf4 |
| F0 Fm F1 |
| |
| sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm |
| sf2: Fm sf4: F1 |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| ------------------------------------------------------------------------------ |
| RESOURCES USED [optional] |
| |
| When the code is written for a specific target processor the |
| the resources used should be documented below. |
| |
| HEAP MEMORY USED: x bytes |
| |
| STACK MEMORY USED: x bytes |
| |
| CLOCK CYCLES: (cycle count equation for this function) + (variable |
| used to represent cycle count for each subroutine |
| called) |
| where: (cycle count variable) = cycle count for [subroutine |
| name] |
| |
| ------------------------------------------------------------------------------ |
| CAUTION [optional] |
| [State any special notes, constraints or cautions for users of this function] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| void Int_lpc_1and3( |
| Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
| Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of |
| present frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of |
| present frame (M) */ |
| Word16 Az[], /* o : interpolated LP parameters in all subfr. |
| (AZ_SIZE) */ |
| Flag *pOverflow |
| ) |
| { |
| Word16 i; |
| Word16 lsp[M]; |
| Word16 *p_lsp_old = &lsp_old[0]; |
| Word16 *p_lsp_mid = &lsp_mid[0]; |
| Word16 *p_lsp_new = &lsp_new[0]; |
| Word16 *p_lsp = &lsp[0]; |
| |
| /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ |
| |
| for (i = M >> 1; i != 0; i--) |
| { |
| *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); |
| *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 1 */ |
| |
| Az += MP1; |
| |
| Lsp_Az( |
| lsp_mid, |
| Az, |
| pOverflow); /* Subframe 2 */ |
| |
| Az += MP1; |
| |
| p_lsp_mid = &lsp_mid[0]; |
| p_lsp = &lsp[0]; |
| |
| for (i = M >> 1; i != 0; i--) |
| { |
| *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); |
| *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 3 */ |
| |
| Az += MP1; |
| |
| Lsp_Az( |
| lsp_new, |
| Az, |
| pOverflow); /* Subframe 4 */ |
| |
| return; |
| } |
| |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: Int_lpc_1and3_2 |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| lsp_old -- array of type Word16 -- LSP vector at the |
| 4th subfr. of past frame (M) |
| lsp_mid -- array of type Word16 -- LSP vector at the 2nd subfr. of |
| present frame (M) |
| lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of |
| present frame (M) |
| |
| Outputs: |
| Az -- array of type Word16 -- interpolated LP parameters in. |
| subfr 1 and 2. |
| pOverflow -- pointer to type Flag -- Overflow indicator |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Purpose : Interpolation of the LPC parameters. Same as the Int_lpc |
| function but we do not recompute Az() for subframe 2 and |
| 4 because it is already available. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| ------------------------------------------------------------------------------ |
| RESOURCES USED [optional] |
| |
| When the code is written for a specific target processor the |
| the resources used should be documented below. |
| |
| HEAP MEMORY USED: x bytes |
| |
| STACK MEMORY USED: x bytes |
| |
| CLOCK CYCLES: (cycle count equation for this function) + (variable |
| used to represent cycle count for each subroutine |
| called) |
| where: (cycle count variable) = cycle count for [subroutine |
| name] |
| |
| ------------------------------------------------------------------------------ |
| CAUTION [optional] |
| [State any special notes, constraints or cautions for users of this function] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| void Int_lpc_1and3_2( |
| Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
| Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of |
| present frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th subframe of |
| present frame (M) */ |
| Word16 Az[], /* o :interpolated LP parameters |
| in subframes 1 and 3 (AZ_SIZE) */ |
| Flag *pOverflow |
| ) |
| { |
| Word16 i; |
| Word16 lsp[M]; |
| Word16 *p_lsp_old = &lsp_old[0]; |
| Word16 *p_lsp_mid = &lsp_mid[0]; |
| Word16 *p_lsp_new = &lsp_new[0]; |
| Word16 *p_lsp = &lsp[0]; |
| |
| /* lsp[i] = lsp_mid[i] * 0.5 + lsp_old[i] * 0.5 */ |
| |
| for (i = M >> 1; i != 0; i--) |
| { |
| *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); |
| *(p_lsp++) = (*(p_lsp_old++) >> 1) + (*(p_lsp_mid++) >> 1); |
| } |
| Lsp_Az(lsp, Az, pOverflow); /* Subframe 1 */ |
| Az += MP1 * 2; |
| |
| p_lsp_mid = &lsp_mid[0]; |
| p_lsp = &lsp[0]; |
| |
| for (i = M >> 1; i != 0; i--) |
| { |
| *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); |
| *(p_lsp++) = (*(p_lsp_mid++) >> 1) + (*(p_lsp_new++) >> 1); |
| } |
| |
| Lsp_Az(lsp, Az, pOverflow); /* Subframe 3 */ |
| |
| return; |
| } |
| |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: lsp |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| lsp_old -- array of type Word16 -- LSP vector at the |
| 4th subfr. of past frame (M) |
| lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of |
| present frame (M) |
| |
| Outputs: |
| Az -- array of type Word16 -- interpolated LP parameters in. |
| all subframes. |
| pOverflow -- pointer to type Flag -- Overflow indicator |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| PURPOSE: Interpolates the LSPs and convert to LP parameters to get |
| a different LP filter in each subframe. |
| |
| DESCRIPTION: |
| The 20 ms speech frame is divided into 4 subframes. |
| The LSPs are quantized and transmitted at the 4th subframe |
| (once per frame) and interpolated at the 1st, 2nd and 3rd subframe. |
| |
| |------|------|------|------| |
| sf1 sf2 sf3 sf4 |
| F0 F1 |
| |
| sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 |
| sf2: 1/2 F0 + 1/2 F1 sf4: F1 |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| ------------------------------------------------------------------------------ |
| RESOURCES USED [optional] |
| |
| When the code is written for a specific target processor the |
| the resources used should be documented below. |
| |
| HEAP MEMORY USED: x bytes |
| |
| STACK MEMORY USED: x bytes |
| |
| CLOCK CYCLES: (cycle count equation for this function) + (variable |
| used to represent cycle count for each subroutine |
| called) |
| where: (cycle count variable) = cycle count for [subroutine |
| name] |
| |
| ------------------------------------------------------------------------------ |
| CAUTION [optional] |
| [State any special notes, constraints or cautions for users of this function] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| void Int_lpc_1to3( |
| Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */ |
| Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */ |
| Word16 Az[], /* output: interpolated LP parameters in all SFs */ |
| Flag *pOverflow |
| ) |
| { |
| Word16 i; |
| Word16 temp; |
| Word16 temp2; |
| |
| Word16 lsp[M]; |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_old[i], 2, pOverflow); |
| temp = sub(lsp_old[i], temp, pOverflow); |
| temp2 = shr(lsp_new[i], 2, pOverflow); |
| |
| lsp[i] = add(temp2, temp, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 1 */ |
| |
| Az += MP1; |
| |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_new[i], 1, pOverflow); |
| temp2 = shr(lsp_old[i], 1, pOverflow); |
| lsp[i] = add(temp, temp2, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 2 */ |
| |
| Az += MP1; |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_new[i], 2, pOverflow); |
| temp = sub(lsp_new[i], temp, pOverflow); |
| temp2 = shr(lsp_old[i], 2, pOverflow); |
| |
| lsp[i] = add(temp2, temp, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 3 */ |
| |
| Az += MP1; |
| |
| Lsp_Az( |
| lsp_new, |
| Az, |
| pOverflow); /* Subframe 4 */ |
| |
| return; |
| } |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: Int_lpc_1to3_2 |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| lsp_old -- array of type Word16 -- LSP vector at the |
| 4th subfr. of past frame (M) |
| lsp_new -- array of type Word16 -- LSP vector at the 4th subfr. of |
| present frame (M) |
| |
| Outputs: |
| Az -- array of type Word16 -- interpolated LP parameters in. |
| subfr 1, 2, and 3. |
| pOverflow -- pointer to type Flag -- Overflow indicator |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Interpolation of the LPC parameters. |
| Same as the previous function but we do not recompute Az() for |
| subframe 4 because it is already available. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| int_lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| ------------------------------------------------------------------------------ |
| RESOURCES USED [optional] |
| |
| When the code is written for a specific target processor the |
| the resources used should be documented below. |
| |
| HEAP MEMORY USED: x bytes |
| |
| STACK MEMORY USED: x bytes |
| |
| CLOCK CYCLES: (cycle count equation for this function) + (variable |
| used to represent cycle count for each subroutine |
| called) |
| where: (cycle count variable) = cycle count for [subroutine |
| name] |
| |
| ------------------------------------------------------------------------------ |
| CAUTION [optional] |
| [State any special notes, constraints or cautions for users of this function] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| void Int_lpc_1to3_2( |
| Word16 lsp_old[], /* input : LSP vector at the 4th SF of past frame */ |
| Word16 lsp_new[], /* input : LSP vector at the 4th SF of present frame */ |
| Word16 Az[], /* output: interpolated LP parameters in SFs 1,2,3 */ |
| Flag *pOverflow |
| ) |
| { |
| Word16 i; |
| Word16 temp; |
| Word16 temp2; |
| Word16 lsp[M]; |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_old[i], 2, pOverflow); |
| |
| temp = sub(lsp_old[i], temp, pOverflow); |
| |
| temp2 = shr(lsp_new[i], 2, pOverflow); |
| |
| lsp[i] = add(temp2, temp, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 1 */ |
| |
| Az += MP1; |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_new[i], 1, pOverflow); |
| temp2 = shr(lsp_old[i], 1, pOverflow); |
| |
| lsp[i] = add(temp2, temp, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 2 */ |
| |
| Az += MP1; |
| |
| for (i = 0; i < M; i++) |
| { |
| temp = shr(lsp_new[i], 2, pOverflow); |
| temp = sub(lsp_new[i], temp, pOverflow); |
| temp2 = shr(lsp_old[i], 2, pOverflow); |
| |
| lsp[i] = add(temp, temp2, pOverflow); |
| } |
| |
| Lsp_Az( |
| lsp, |
| Az, |
| pOverflow); /* Subframe 3 */ |
| |
| return; |
| } |
| |
