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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/lsp_avg.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/lsp_avg.cpp | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/lsp_avg.cpp b/media/libstagefright/codecs/amrnb/dec/src/lsp_avg.cpp new file mode 100644 index 0000000..9b65c7a --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/lsp_avg.cpp @@ -0,0 +1,317 @@ +/* ------------------------------------------------------------------ + * 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/lsp_avg.c + Functions: + + + Date: 04/14/2000 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Removed the functions lsp_avg_init and lsp_avg_exit. + The lsp_avg related structure is no longer dynamically allocated. + + Also, placed code in the proper PV Software Template. + + Description: Per review comments, updated the inputs/outputs section + for the function lsp_avg. + + Description: Changed to accept the pOverflow flag for EPOC compatibility. + + Description: Per review comments, I added a description of pOverflow + to the input/output section of the template. I also removed an unnecessary + include file, <stdio.h> + + Description: Removed q_plsf_5.tab from Include section and added + q_plsf_5_tbl.h to Include section. Changed "mean_lsf" + to "mean_lsf_5" in lsp_avg_reset(). + + Description: Replaced OSCL mem type functions and eliminated include + files that now are chosen by OSCL definitions + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: Changed round function name to pv_round to avoid conflict with + round function in C standard library. + + Description: + +------------------------------------------------------------------------------ + MODULE DESCRIPTION + + LSP averaging and history +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "lsp_avg.h" +#include "basic_op.h" +#include "oper_32b.h" +#include "copy.h" +#include "q_plsf_5_tbl.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 +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL VARIABLES REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: lsp_avg_reset +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + st = pointer to structure of type lsp_avgState + + Outputs: + fields of the structure pointed to by state are initialized. + + Returns: + return_value = 0, if reset was successful; -1, otherwise (int) + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + +lsp_avg.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +int lsp_avg_reset (lsp_avgState *st) +{ + if (st == (lsp_avgState *) NULL){ + // fprintf(stderr, "lsp_avg_reset: invalid parameter\n"); + return -1; + } + + Copy(mean_lsf, &st->lsp_meanSave[0], M); + + 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 lsp_avg_reset(lsp_avgState *st) +{ + if (st == (lsp_avgState *) NULL) + { + /* fprintf(stderr, "lsp_avg_reset: invalid parameter\n"); */ + return -1; + } + + Copy(mean_lsf_5, &st->lsp_meanSave[0], M); + + return 0; +} + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: lsp_avg +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + st = pointer to structure of type lsp_avgState + lsp = pointer to Word16, which reflects the state of the state machine + + Outputs: + st = pointer to structure of type lsp_avgState + pOverflow = pointer to type Flag -- overflow indicator + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + +lsp_avg.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + + +void lsp_avg ( + lsp_avgState *st, // i/o : State struct Q15 + Word16 *lsp // i : state of the state machine Q15 +) +{ + Word16 i; + Word32 L_tmp; // Q31 + + for (i = 0; i < M; i++) { + + // mean = 0.84*mean + L_tmp = L_deposit_h(st->lsp_meanSave[i]); + L_tmp = L_msu(L_tmp, EXPCONST, st->lsp_meanSave[i]); + + // Add 0.16 of newest LSPs to mean + L_tmp = L_mac(L_tmp, EXPCONST, lsp[i]); + + // Save means + st->lsp_meanSave[i] = pv_round(L_tmp); // Q15 + } + + 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 lsp_avg( + lsp_avgState *st, /* i/o : State struct Q15 */ + Word16 *lsp, /* i : state of the state machine Q15 */ + Flag *pOverflow /* o : Flag set when overflow occurs */ +) +{ + Word16 i; + Word32 L_tmp; /* Q31 */ + + for (i = 0; i < M; i++) + { + + /* mean = 0.84*mean */ + L_tmp = L_deposit_h(st->lsp_meanSave[i]); + L_tmp = L_msu(L_tmp, EXPCONST, st->lsp_meanSave[i], pOverflow); + + /* Add 0.16 of newest LSPs to mean */ + L_tmp = L_mac(L_tmp, EXPCONST, lsp[i], pOverflow); + + /* Save means */ + st->lsp_meanSave[i] = pv_round(L_tmp, pOverflow); /* Q15 */ + } + + return; +} |