| /* ------------------------------------------------------------------ |
| * 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/ph_disp.c |
| Functions: |
| ph_disp_reset |
| ph_disp_lock |
| ph_disp_release |
| ph_disp |
| |
| Date: 04/05/2000 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Changed template used to PV coding template. First attempt at |
| optimizing C code. |
| |
| Description: Updated file per comments gathered from Phase 2/3 review. |
| |
| Description: Clarified grouping in the equation to calculated L_temp from the |
| product of state->prevCbGain and ONFACTPLUS1 in the ph_disp |
| function. |
| |
| Description: Added setting of Overflow flag in inlined code. |
| |
| Description: Synchronized file with UMTS version 3.2.0. Updated coding |
| coding template. Removed unnecessary include files. |
| |
| Description: Replaced basic_op.h with the header file of the math functions |
| used in the file. |
| |
| Description: Removed the functions ph_disp_init and ph_disp_exit. |
| The ph_disp related structure is no longer dynamically allocated. |
| |
| Description: Pass in pointer to overflow flag for EPOC compatibility. |
| Change code for ph_disp() function to reflect this. Remove |
| inclusion of ph_disp.tab. This table will now be referenced |
| externally. |
| |
| Description: Optimized ph_disp() to reduce clock cycle usage. Updated |
| copyright year and removed unused files in Include section. |
| |
| Description: Replaced OSCL mem type functions and eliminated include |
| files that now are chosen by OSCL definitions |
| |
| Description: Replaced "int" and/or "char" with defined types. |
| Added proper casting (Word32) to some left shifting operations |
| |
| Description: Changed round function name to pv_round to avoid conflict with |
| round function in C standard library. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| MODULE DESCRIPTION |
| |
| This file contains the function that performs adaptive phase dispersion of |
| the excitation signal. The phase dispersion initialization, reset, and |
| exit functions are included in this file, as well as, the phase dispersion |
| lock and release functions. |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "ph_disp.h" |
| #include "typedef.h" |
| #include "basic_op.h" |
| #include "cnst.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: ph_disp_reset |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to a structure of type ph_dispState |
| |
| Outputs: |
| Structure pointed to by state is initialized to zeros |
| |
| Returns: |
| return_value = 0, if reset was successful; -1, otherwise (int) |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function resets the variables used by the phase dispersion function. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ph_disp.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| int ph_disp_reset (ph_dispState *state) |
| { |
| Word16 i; |
| |
| if (state == (ph_dispState *) NULL){ |
| fprint(stderr, "ph_disp_reset: invalid parameter\n"); |
| return -1; |
| } |
| for (i=0; i<PHDGAINMEMSIZE; i++) |
| { |
| state->gainMem[i] = 0; |
| } |
| state->prevState = 0; |
| state->prevCbGain = 0; |
| state->lockFull = 0; |
| state->onset = 0; // assume no onset in start |
| |
| return 0; |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| Word16 ph_disp_reset(ph_dispState *state) |
| { |
| Word16 i; |
| |
| if (state == (ph_dispState *) NULL) |
| { |
| /* fprint(stderr, "ph_disp_reset: invalid parameter\n"); */ |
| return(-1); |
| } |
| for (i = 0; i < PHDGAINMEMSIZE; i++) |
| { |
| state->gainMem[i] = 0; |
| } |
| state->prevState = 0; |
| state->prevCbGain = 0; |
| state->lockFull = 0; |
| state->onset = 0; /* assume no onset in start */ |
| |
| return(0); |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: ph_disp_lock |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to a structure of type ph_dispState |
| |
| Outputs: |
| lockFull field of the structure pointed to by state is set to 1 |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function sets the lockFull flag to indicate a lock condition. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ph_disp.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| void ph_disp_lock (ph_dispState *state) |
| { |
| state->lockFull = 1; |
| return; |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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 ph_disp_lock(ph_dispState *state) |
| { |
| state->lockFull = 1; |
| |
| return; |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: ph_disp_release |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to a structure of type ph_dispState |
| |
| Outputs: |
| lockFull field of the structure pointed to by state is set to 0 |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function clears the lockFull flag to indicate an unlocked state. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ph_disp.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| void ph_disp_release (ph_dispState *state) |
| { |
| state->lockFull = 0; |
| return; |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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 ph_disp_release(ph_dispState *state) |
| { |
| state->lockFull = 0; |
| |
| return; |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: ph_disp |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to a structure of type ph_dispState |
| mode = codec mode (enum Mode) |
| x = LTP excitation signal buffer (Word16) |
| cbGain = codebook gain (Word16) |
| ltpGain = LTP gain (Word16) |
| inno = innovation buffer (Word16) |
| pitch_fac = pitch factor used to scale the LTP excitation (Word16) |
| tmp_shift = shift factor applied to sum of scaled LTP excitation and |
| innovation before rounding (Word16) |
| pOverflow = pointer to overflow indicator (Flag) |
| |
| Outputs: |
| structure pointed to by state contains the updated gainMem array, |
| prevState, prevCbGain, and onset fields |
| x buffer contains the new excitation signal |
| inno buffer contains the new innovation signal |
| pOverflow -> 1 if there is overflow |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function performs adaptive phase dispersion, i.e., forming of total |
| excitation for the synthesis part of the decoder. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ph_disp.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| void ph_disp ( |
| ph_dispState *state, // i/o : State struct |
| enum Mode mode, // i : codec mode |
| Word16 x[], // i/o Q0 : in: LTP excitation signal |
| // out: total excitation signal |
| Word16 cbGain, // i Q1 : Codebook gain |
| Word16 ltpGain, // i Q14 : LTP gain |
| Word16 inno[], // i/o Q13 : Innovation vector (Q12 for 12.2) |
| Word16 pitch_fac, // i Q14 : pitch factor used to scale the |
| LTP excitation (Q13 for 12.2) |
| Word16 tmp_shift // i Q0 : shift factor applied to sum of |
| scaled LTP ex & innov. before |
| rounding |
| ) |
| { |
| Word16 i, i1; |
| Word16 tmp1; |
| Word32 L_temp; |
| Word16 impNr; // indicator for amount of disp./filter used |
| |
| Word16 inno_sav[L_SUBFR]; |
| Word16 ps_poss[L_SUBFR]; |
| Word16 j, nze, nPulse, ppos; |
| const Word16 *ph_imp; // Pointer to phase dispersion filter |
| |
| // Update LTP gain memory |
| for (i = PHDGAINMEMSIZE-1; i > 0; i--) |
| { |
| state->gainMem[i] = state->gainMem[i-1]; |
| } |
| state->gainMem[0] = ltpGain; |
| |
| // basic adaption of phase dispersion |
| if (sub(ltpGain, PHDTHR2LTP) < 0) { // if (ltpGain < 0.9) |
| if (sub(ltpGain, PHDTHR1LTP) > 0) |
| { // if (ltpGain > 0.6 |
| impNr = 1; // medium dispersion |
| } |
| else |
| { |
| impNr = 0; // maximum dispersion |
| } |
| } |
| else |
| { |
| impNr = 2; // no dispersion |
| } |
| |
| // onset indicator |
| // onset = (cbGain > onFact * cbGainMem[0]) |
| tmp1 = pv_round(L_shl(L_mult(state->prevCbGain, ONFACTPLUS1), 2)); |
| if (sub(cbGain, tmp1) > 0) |
| { |
| state->onset = ONLENGTH; |
| } |
| else |
| { |
| if (state->onset > 0) |
| { |
| state->onset = sub (state->onset, 1); |
| } |
| } |
| |
| // if not onset, check ltpGain buffer and use max phase dispersion if |
| half or more of the ltpGain-parameters say so |
| if (state->onset == 0) |
| { |
| // Check LTP gain memory and set filter accordingly |
| i1 = 0; |
| for (i = 0; i < PHDGAINMEMSIZE; i++) |
| { |
| if (sub(state->gainMem[i], PHDTHR1LTP) < 0) |
| { |
| i1 = add (i1, 1); |
| } |
| } |
| if (sub(i1, 2) > 0) |
| { |
| impNr = 0; |
| } |
| |
| } |
| // Restrict decrease in phase dispersion to one step if not onset |
| if ((sub(impNr, add(state->prevState, 1)) > 0) && (state->onset == 0)) |
| { |
| impNr = sub (impNr, 1); |
| } |
| // if onset, use one step less phase dispersion |
| if((sub(impNr, 2) < 0) && (state->onset > 0)) |
| { |
| impNr = add (impNr, 1); |
| } |
| |
| // disable for very low levels |
| if(sub(cbGain, 10) < 0) |
| { |
| impNr = 2; |
| } |
| |
| if(sub(state->lockFull, 1) == 0) |
| { |
| impNr = 0; |
| } |
| |
| // update static memory |
| state->prevState = impNr; |
| state->prevCbGain = cbGain; |
| |
| // do phase dispersion for all modes but 12.2 and 7.4; |
| // don't modify the innovation if impNr >=2 (= no phase disp) |
| if (sub(mode, MR122) != 0 && |
| sub(mode, MR102) != 0 && |
| sub(mode, MR74) != 0 && |
| sub(impNr, 2) < 0) |
| { |
| // track pulse positions, save innovation, |
| and initialize new innovation |
| nze = 0; |
| for (i = 0; i < L_SUBFR; i++) |
| { |
| if (inno[i] != 0) |
| { |
| ps_poss[nze] = i; |
| nze = add (nze, 1); |
| } |
| inno_sav[i] = inno[i]; |
| inno[i] = 0; |
| } |
| // Choose filter corresponding to codec mode and dispersion criterium |
| if (sub (mode, MR795) == 0) |
| { |
| if (impNr == 0) |
| { |
| ph_imp = ph_imp_low_MR795; |
| } |
| else |
| { |
| ph_imp = ph_imp_mid_MR795; |
| } |
| } |
| else |
| { |
| if (impNr == 0) |
| { |
| ph_imp = ph_imp_low; |
| } |
| else |
| { |
| ph_imp = ph_imp_mid; |
| } |
| } |
| |
| // Do phase dispersion of innovation |
| for (nPulse = 0; nPulse < nze; nPulse++) |
| { |
| ppos = ps_poss[nPulse]; |
| |
| // circular convolution with impulse response |
| j = 0; |
| for (i = ppos; i < L_SUBFR; i++) |
| { |
| // inno[i1] += inno_sav[ppos] * ph_imp[i1-ppos] |
| tmp1 = mult(inno_sav[ppos], ph_imp[j++]); |
| inno[i] = add(inno[i], tmp1); |
| } |
| |
| for (i = 0; i < ppos; i++) |
| { |
| // inno[i] += inno_sav[ppos] * ph_imp[L_SUBFR-ppos+i] |
| tmp1 = mult(inno_sav[ppos], ph_imp[j++]); |
| inno[i] = add(inno[i], tmp1); |
| } |
| } |
| } |
| |
| // compute total excitation for synthesis part of decoder |
| // (using modified innovation if phase dispersion is active) |
| for (i = 0; i < L_SUBFR; i++) |
| { |
| // x[i] = gain_pit*x[i] + cbGain*code[i]; |
| L_temp = L_mult ( x[i], pitch_fac); |
| // 12.2: Q0 * Q13 |
| // 7.4: Q0 * Q14 |
| L_temp = L_mac (L_temp, inno[i], cbGain); |
| // 12.2: Q12 * Q1 |
| // 7.4: Q13 * Q1 |
| L_temp = L_shl (L_temp, tmp_shift); // Q16 |
| x[i] = pv_round (L_temp); |
| } |
| |
| return; |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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 ph_disp( |
| ph_dispState *state, /* i/o : State struct */ |
| enum Mode mode, /* i : codec mode */ |
| Word16 x[], /* i/o Q0 : in: LTP excitation signal */ |
| /* out: total excitation signal */ |
| Word16 cbGain, /* i Q1 : Codebook gain */ |
| Word16 ltpGain, /* i Q14 : LTP gain */ |
| Word16 inno[], /* i/o Q13 : Innovation vector (Q12 for 12.2) */ |
| Word16 pitch_fac, /* i Q14 : pitch factor used to scale the |
| LTP excitation (Q13 for 12.2) */ |
| Word16 tmp_shift, /* i Q0 : shift factor applied to sum of |
| scaled LTP ex & innov. before |
| rounding */ |
| Flag *pOverflow /* i/o : oveflow indicator */ |
| ) |
| { |
| Word16 i, i1; |
| Word16 tmp1; |
| Word32 L_temp; |
| Word32 L_temp2; |
| Word16 impNr; /* indicator for amount of disp./filter used */ |
| |
| Word16 inno_sav[L_SUBFR]; |
| Word16 ps_poss[L_SUBFR]; |
| Word16 nze, nPulse; |
| Word16 ppos; |
| const Word16 *ph_imp; /* Pointer to phase dispersion filter */ |
| |
| Word16 *p_inno; |
| Word16 *p_inno_sav; |
| Word16 *p_x; |
| const Word16 *p_ph_imp; |
| Word16 c_inno_sav; |
| |
| /* Update LTP gain memory */ |
| /* Unrolled FOR loop below since PHDGAINMEMSIZE is assumed to stay */ |
| /* the same. */ |
| /* for (i = PHDGAINMEMSIZE-1; i > 0; i--) */ |
| /* { */ |
| /* state->gainMem[i] = state->gainMem[i-1]; */ |
| /* } */ |
| state->gainMem[4] = state->gainMem[3]; |
| state->gainMem[3] = state->gainMem[2]; |
| state->gainMem[2] = state->gainMem[1]; |
| state->gainMem[1] = state->gainMem[0]; |
| state->gainMem[0] = ltpGain; |
| |
| /* basic adaption of phase dispersion */ |
| |
| if (ltpGain < PHDTHR2LTP) /* if (ltpGain < 0.9) */ |
| { |
| if (ltpGain > PHDTHR1LTP) |
| { /* if (ltpGain > 0.6 */ |
| impNr = 1; /* medium dispersion */ |
| } |
| else |
| { |
| impNr = 0; /* maximum dispersion */ |
| } |
| } |
| else |
| { |
| impNr = 2; /* no dispersion */ |
| } |
| |
| /* onset indicator */ |
| /* onset = (cbGain > onFact * cbGainMem[0]) */ |
| |
| L_temp = ((Word32) state->prevCbGain * ONFACTPLUS1) << 1; |
| |
| /* (L_temp << 2) calculation with saturation check */ |
| if (L_temp > (Word32) 0X1fffffffL) |
| { |
| *pOverflow = 1; |
| L_temp = MAX_32; |
| } |
| else if (L_temp < (Word32) 0xe0000000L) |
| { |
| *pOverflow = 1; |
| L_temp = MIN_32; |
| } |
| else |
| { |
| L_temp <<= 2; |
| } |
| |
| tmp1 = pv_round(L_temp, pOverflow); |
| |
| if (cbGain > tmp1) |
| { |
| state->onset = ONLENGTH; |
| } |
| else |
| { |
| |
| if (state->onset > 0) |
| { |
| state->onset -= 1; |
| } |
| } |
| |
| /* if not onset, check ltpGain buffer and use max phase dispersion if |
| half or more of the ltpGain-parameters say so */ |
| if (state->onset == 0) |
| { |
| /* Check LTP gain memory and set filter accordingly */ |
| i1 = 0; |
| for (i = 0; i < PHDGAINMEMSIZE; i++) |
| { |
| if (state->gainMem[i] < PHDTHR1LTP) |
| { |
| i1 += 1; |
| } |
| } |
| |
| if (i1 > 2) |
| { |
| impNr = 0; |
| } |
| } |
| /* Restrict decrease in phase dispersion to one step if not onset */ |
| if ((impNr > ((state->prevState) + 1)) && (state->onset == 0)) |
| { |
| impNr -= 1; |
| } |
| |
| /* if onset, use one step less phase dispersion */ |
| if ((impNr < 2) && (state->onset > 0)) |
| { |
| impNr += 1; |
| } |
| |
| /* disable for very low levels */ |
| if (cbGain < 10) |
| { |
| impNr = 2; |
| } |
| |
| if (state->lockFull == 1) |
| { |
| impNr = 0; |
| } |
| |
| /* update static memory */ |
| state->prevState = impNr; |
| state->prevCbGain = cbGain; |
| |
| /* do phase dispersion for all modes but 12.2 and 7.4; |
| don't modify the innovation if impNr >=2 (= no phase disp) */ |
| if ((mode != MR122) && (mode != MR102) && (mode != MR74) && (impNr < 2)) |
| { |
| /* track pulse positions, save innovation, |
| and initialize new innovation */ |
| nze = 0; |
| p_inno = &inno[0]; |
| p_inno_sav = &inno_sav[0]; |
| |
| for (i = 0; i < L_SUBFR; i++) |
| { |
| if (*(p_inno) != 0) |
| { |
| ps_poss[nze] = i; |
| nze += 1; |
| } |
| *(p_inno_sav++) = *(p_inno); |
| *(p_inno++) = 0; |
| } |
| |
| /* Choose filter corresponding to codec mode and dispersion criterium */ |
| if (mode == MR795) |
| { |
| if (impNr == 0) |
| { |
| ph_imp = ph_imp_low_MR795; |
| } |
| else |
| { |
| ph_imp = ph_imp_mid_MR795; |
| } |
| } |
| else |
| { |
| if (impNr == 0) |
| { |
| ph_imp = ph_imp_low; |
| } |
| else |
| { |
| ph_imp = ph_imp_mid; |
| } |
| } |
| |
| /* Do phase dispersion of innovation */ |
| for (nPulse = 0; nPulse < nze; nPulse++) |
| { |
| ppos = ps_poss[nPulse]; |
| |
| /* circular convolution with impulse response */ |
| c_inno_sav = inno_sav[ppos]; |
| p_inno = &inno[ppos]; |
| p_ph_imp = ph_imp; |
| |
| for (i = ppos; i < L_SUBFR; i++) |
| { |
| /* inno[i1] += inno_sav[ppos] * ph_imp[i1-ppos] */ |
| L_temp = ((Word32) c_inno_sav * *(p_ph_imp++)) >> 15; |
| tmp1 = (Word16) L_temp; |
| *(p_inno) = add(*(p_inno), tmp1, pOverflow); |
| p_inno += 1; |
| } |
| |
| p_inno = &inno[0]; |
| |
| for (i = 0; i < ppos; i++) |
| { |
| /* inno[i] += inno_sav[ppos] * ph_imp[L_SUBFR-ppos+i] */ |
| L_temp = ((Word32) c_inno_sav * *(p_ph_imp++)) >> 15; |
| tmp1 = (Word16) L_temp; |
| *(p_inno) = add(*(p_inno), tmp1, pOverflow); |
| p_inno += 1; |
| } |
| } |
| } |
| |
| /* compute total excitation for synthesis part of decoder |
| (using modified innovation if phase dispersion is active) */ |
| p_inno = &inno[0]; |
| p_x = &x[0]; |
| |
| for (i = 0; i < L_SUBFR; i++) |
| { |
| /* x[i] = gain_pit*x[i] + cbGain*code[i]; */ |
| L_temp = L_mult(x[i], pitch_fac, pOverflow); |
| /* 12.2: Q0 * Q13 */ |
| /* 7.4: Q0 * Q14 */ |
| L_temp2 = ((Word32) * (p_inno++) * cbGain) << 1; |
| L_temp = L_add(L_temp, L_temp2, pOverflow); |
| /* 12.2: Q12 * Q1 */ |
| /* 7.4: Q13 * Q1 */ |
| L_temp = L_shl(L_temp, tmp_shift, pOverflow); /* Q16 */ |
| *(p_x++) = pv_round(L_temp, pOverflow); |
| } |
| |
| return; |
| } |
