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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/spreproc.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/spreproc.cpp | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/spreproc.cpp b/media/libstagefright/codecs/amrnb/enc/src/spreproc.cpp new file mode 100644 index 0000000..71d645a --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/spreproc.cpp @@ -0,0 +1,234 @@ +/* ------------------------------------------------------------------ + * 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/spreproc.c + Functions: subframePreProc + + Date: 02/06/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Updated template used to PV coding template. + Eliminated unnecessary use of the sub() function. + + Description: + 1. Replaced copy() and for-loop with more efficient memcpy(). + 2. Eliminated unused include file copy.h. + + 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: + +------------------------------------------------------------------------------ + MODULE DESCRIPTION + + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include <string.h> + +#include "spreproc.h" +#include "typedef.h" +#include "weight_a.h" +#include "syn_filt.h" +#include "residu.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: subframePreProc +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + mode -- enum Mode -- coder mode + gamma1 -- const Word16 array -- spectral exp. factor 1 + gamma1_12k2 -- const Word16 array -- spectral exp. factor 1 for EFR + gamma2 -- const Word16 array -- spectral exp. factor 2 + A -- Pointer to Word16 -- A(z) unquantized for the 4 subframes + Aq -- Pointer to Word16 -- A(z) quantized for the 4 subframes + speech -- Pointer to Word16 -- speech segment + mem_err -- Pointer to Word16 -- pointer to error signal + mem_w0 -- Pointer to Word16 -- memory of weighting filter + zero -- Pointer to Word16 -- pointer to zero vector + + Outputs: + ai_zero -- Word16 array -- history of weighted synth. filter + exc -- Word16 array -- long term prediction residual + h1 -- Word16 array -- impulse response + xn -- Word16 array -- target vector for pitch search + res2 -- Word16 array -- long term prediction residual + error -- Word16 array -- error of LPC synthesis filter + + Returns: + Zero + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + spreproc.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 subframePreProc( + 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, /* i : A(z) unquantized for the 4 subframes */ + Word16 *Aq, /* i : A(z) quantized for the 4 subframes */ + Word16 *speech, /* i : speech segment */ + Word16 *mem_err, /* i : pointer to error signal */ + Word16 *mem_w0, /* i : memory of weighting filter */ + Word16 *zero, /* i : pointer to zero vector */ + Word16 ai_zero[], /* o : history of weighted synth. filter */ + Word16 exc[], /* o : long term prediction residual */ + Word16 h1[], /* o : impulse response */ + Word16 xn[], /* o : target vector for pitch search */ + Word16 res2[], /* o : long term prediction residual */ + Word16 error[] /* o : error of LPC synthesis filter */ +) +{ + Word16 Ap1[MP1]; /* A(z) with spectral expansion */ + Word16 Ap2[MP1]; /* A(z) with spectral expansion */ + const Word16 *g1; /* Pointer to correct gammma1 vector */ + + /* mode specific pointer to gamma1 values */ + if (mode == MR122 || mode == MR102) + { + g1 = gamma1_12k2; + } + else + { + g1 = gamma1; + } + + /* Find the weighted LPC coefficients for the weighting filter. */ + Weight_Ai(A, g1, Ap1); + Weight_Ai(A, gamma2, Ap2); + + memcpy(ai_zero, Ap1, (M + 1)*sizeof(Word16)); + + + Syn_filt(Aq, ai_zero, h1, L_SUBFR, zero, 0); + Syn_filt(Ap2, h1, h1, L_SUBFR, zero, 0); + + /* + * + * Find the target vector for pitch search: + * + */ + + /* LPC residual */ + Residu(Aq, speech, res2, L_SUBFR); + + memcpy(exc, res2, L_SUBFR*sizeof(Word16)); + + Syn_filt(Aq, exc, error, L_SUBFR, mem_err, 0); + + Residu(Ap1, error, xn, L_SUBFR); + + /* target signal xn[]*/ + Syn_filt(Ap2, xn, xn, L_SUBFR, mem_w0, 0); + + return; + +} |