diff options
Diffstat (limited to 'opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/pre_big.cpp')
| -rw-r--r-- | opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/pre_big.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/pre_big.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/pre_big.cpp new file mode 100644 index 0000000..b0fcf75 --- /dev/null +++ b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/pre_big.cpp @@ -0,0 +1,181 @@ +/* ------------------------------------------------------------------ + * 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. +****************************************************************************************/ +/* +------------------------------------------------------------------------------ + + + + Filename: pre_big.cpp + +------------------------------------------------------------------------------ + MODULE DESCRIPTION + + Big subframe (2 subframes) preprocessing +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "pre_big.h" +#include "typedef.h" +#include "basic_op.h" +#include "syn_filt.h" +#include "weight_a.h" +#include "residu.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: pre_big +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + mode = enum Mode -- coder mode + gamma1 = array of type const Word16 -- spectral exp. factor 1 + gamma1_12k2 = array of type const Word16 -- spectral exp. factor 1 for EFR + gamma2 = array of type const Word16 -- spectral exp. factor 2 + A_t = array of type Word16 -- A(z) unquantized, for 4 subframes, Q12 + frameOffset = Word16 -- Start position in speech vector, Q0 + speech[] = array of type Word16 -- speech, Q0 + + Outputs: + mem_w = array of type Word16 -- synthesis filter memory state, Q0 + wsp = array of type Word16 -- weighted speech Q0 + pOverflow = pointer of type Flag -- overflow indicator + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + pre_big.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + + +------------------------------------------------------------------------------ + CAUTION [optional] + [State any special notes, constraints or cautions for users of this function] + +------------------------------------------------------------------------------ +*/ + +void pre_big( + enum Mode mode, /* i : coder mode */ + const Word16 gamma1[], /* i : spectral exp. factor 1 */ + const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */ + const Word16 gamma2[], /* i : spectral exp. factor 2 */ + Word16 A_t[], /* i : A(z) unquantized, for 4 subframes, Q12 */ + Word16 frameOffset, /* i : Start position in speech vector, Q0 */ + Word16 speech[], /* i : speech, Q0 */ + Word16 mem_w[], /* i/o: synthesis filter memory state, Q0 */ + Word16 wsp[], /* o : weighted speech Q0 */ + Flag *pOverflow /* o : overflow indicator */ +) +{ + Word16 Ap1[MP1]; /* A(z) with spectral expansion */ + Word16 Ap2[MP1]; /* A(z) with spectral expansion */ + const Word16 *g1; /* Pointer to correct gammma1 vector */ + Word16 aOffset; + Word16 i; + + if (mode <= MR795) + { + g1 = gamma1; + } + else + { + g1 = gamma1_12k2; + } + + if (frameOffset > 0) + { + aOffset = MP1 << 1; + } + else + { + aOffset = 0; + } + + /* process two subframes (which form the "big" subframe) */ + for (i = 0; i < 2; i++) + { + Weight_Ai(&A_t[aOffset], g1, Ap1); + Weight_Ai(&A_t[aOffset], gamma2, Ap2); + Residu(Ap1, &speech[frameOffset], &wsp[frameOffset], L_SUBFR); + + Syn_filt(Ap2, &wsp[frameOffset], &wsp[frameOffset], L_SUBFR, mem_w, 1); + + aOffset += MP1; + + frameOffset += L_SUBFR; + } + + return; +} |