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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/d1035pf.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/d1035pf.cpp | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/d1035pf.cpp b/media/libstagefright/codecs/amrnb/dec/src/d1035pf.cpp new file mode 100644 index 0000000..899daba --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/d1035pf.cpp @@ -0,0 +1,263 @@ +/* ------------------------------------------------------------------ + * 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/d1035pf.c + + Date: 04/14/2000 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Updated template used to PV coding template. First attempt at + optimizing C code. + + Description: Updated file per comments gathered from Phase 2/3 review. + + Description: Synchronized file with UTMS version 3.2.0. Updated coding + template. Removed unnecessary include files. + + Description: Removed inclusion of "gray.tab". + + Description: + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "d1035pf.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. +----------------------------------------------------------------------------*/ +#define NB_PULSE 10 /* number of pulses */ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: dec_10i40_35bits +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + index = buffer containing index of 10 pulses; each element is + represented by sign+position + cod = buffer of algebraic (fixed) codebook excitation + + Outputs: + cod buffer contains the new algebraic codebook excitation + + Returns: + None + + Global Variables Used: + dgray = gray decoding table + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This function builds the innovative codevector from the received index of + algebraic codebook. See c1035pf.c for more details about the algebraic + codebook structure. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + d1035pf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +void dec_10i40_35bits ( + Word16 index[], // (i) : index of 10 pulses (sign+position) + Word16 cod[] // (o) : algebraic (fixed) codebook excitation +) +{ + Word16 i, j, pos1, pos2, sign, tmp; + + for (i = 0; i < L_CODE; i++) + { + cod[i] = 0; + } + + // decode the positions and signs of pulses and build the codeword + + for (j = 0; j < NB_TRACK; j++) + { + // compute index i + + tmp = index[j]; + i = tmp & 7; + i = dgray[i]; + + i = extract_l (L_shr (L_mult (i, 5), 1)); + pos1 = add (i, j); // position of pulse "j" + + i = shr (tmp, 3) & 1; + if (i == 0) + { + sign = 4096; // +1.0 + } + else + { + sign = -4096; // -1.0 + } + + cod[pos1] = sign; + + // compute index i + + i = index[add (j, 5)] & 7; + i = dgray[i]; + i = extract_l (L_shr (L_mult (i, 5), 1)); + + pos2 = add (i, j); // position of pulse "j+5" + + if (sub (pos2, pos1) < 0) + { + sign = negate (sign); + } + cod[pos2] = add (cod[pos2], sign); + } + + 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 dec_10i40_35bits( + Word16 index[], /* (i) : index of 10 pulses (sign+position) */ + Word16 cod[] /* (o) : algebraic (fixed) codebook excitation */ +) +{ + register Word16 i, j, pos1, pos2; + Word16 sign, tmp; + + for (i = 0; i < L_CODE; i++) + { + *(cod + i) = 0; + } + + /* decode the positions and signs of pulses and build the codeword */ + + for (j = 0; j < NB_TRACK; j++) + { + /* compute index i */ + + tmp = *(index + j); + i = tmp & 7; + i = *(dgray + i); + + i = (Word16)(i * 5); + pos1 = i + j; /* position of pulse "j" */ + + i = (tmp >> 3) & 1; + + if (i == 0) + { + sign = 4096; /* +1.0 */ + } + else + { + sign = -4096; /* -1.0 */ + } + + *(cod + pos1) = sign; + + /* compute index i */ + + i = *(index + j + 5) & 7; + i = *(dgray + i); + i = (Word16)(i * 5); + + pos2 = i + j; /* position of pulse "j+5" */ + + + if (pos2 < pos1) + { + sign = negate(sign); + } + *(cod + pos2) += sign; + } + + return; +} |