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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/d8_31pf.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/d8_31pf.cpp | 626 |
1 files changed, 626 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/d8_31pf.cpp b/media/libstagefright/codecs/amrnb/dec/src/d8_31pf.cpp new file mode 100644 index 0000000..917c47f --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/d8_31pf.cpp @@ -0,0 +1,626 @@ +/* ------------------------------------------------------------------ + * 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/d8_31pf.c + Functions: + + + Date: 01/28/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Modified to pass overflow flag through to basic math function. + The flag is passed back to the calling function by pointer reference. + + Description: Per review comments... + (1) Removed include of "count.h" and "basic_op.h" + (2) Added includes of mult.h, shl.h, shr.h, add.h, sub.h, negate.h, + L_mult.h, and L_shr.h + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: + +------------------------------------------------------------------------------ + MODULE DESCRIPTION +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "d8_31pf.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 8 /* number of pulses */ + +/* define values/representation for output codevector and sign */ +#define POS_CODE 8191 +#define NEG_CODE 8191 + + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL VARIABLE DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: decompress10 +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + MSBs -- Word16 -- MSB part of the index + LSBs -- Word16 -- LSB part of the index + index1 -- Word16 -- index for first pos in pos_index[] + index2 -- Word16 -- index for second pos in pos_index[] + index3 -- Word16 -- index for third pos in pos_index[] + + Outputs: + pos_indx[] -- array of type Word16 -- position of 3 pulses (decompressed) + + pOverflow Flag set when overflow occurs, pointer of type Flag * + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + d8_31pf.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] + +------------------------------------------------------------------------------ +*/ + +static void decompress10( + Word16 MSBs, /* i : MSB part of the index */ + Word16 LSBs, /* i : LSB part of the index */ + Word16 index1, /* i : index for first pos in pos_index[] */ + Word16 index2, /* i : index for second pos in pos_index[] */ + Word16 index3, /* i : index for third pos in pos_index[] */ + Word16 pos_indx[], /* o : position of 3 pulses (decompressed) */ + Flag *pOverflow) /* o : Flag set when overflow occurs */ +{ + Word16 ia; + Word16 ib; + Word16 ic; + Word32 tempWord32; + + /* + pos_indx[index1] = ((MSBs-25*(MSBs/25))%5)*2 + (LSBs-4*(LSBs/4))%2; + pos_indx[index2] = ((MSBs-25*(MSBs/25))/5)*2 + (LSBs-4*(LSBs/4))/2; + pos_indx[index3] = (MSBs/25)*2 + LSBs/4; + */ + + if (MSBs > 124) + { + MSBs = 124; + } + + ia = + mult( + MSBs, + 1311, + pOverflow); + + tempWord32 = + L_mult( + ia, + 25, + pOverflow); + + + ia = (Word16)(MSBs - (tempWord32 >> 1)); + ib = + mult( + ia, + 6554, + pOverflow); + + tempWord32 = + L_mult( + ib, + 5, + pOverflow); + + ib = ia - (Word16)(tempWord32 >> 1); + + ib = + shl( + ib, + 1, + pOverflow); + + + ic = LSBs - ((LSBs >> 2) << 2); + + + pos_indx[index1] = ib + (ic & 1); + + + ib = + mult( + ia, + 6554, + pOverflow); + + ib = + shl( + ib, + 1, + pOverflow); + + + pos_indx[index2] = ib + (ic >> 1); + + + ib = LSBs >> 2; + + ic = + mult( + MSBs, + 1311, + pOverflow); + + ic = + shl( + ic, + 1, + pOverflow); + + pos_indx[index3] = + add( + ib, + ic, + pOverflow); + + return; +} + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: decompress_code +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + indx[] -- array of type Word16 -- position and sign of + 8 pulses (compressed) + + Outputs: + sign_indx[] -- array of type Word16 -- signs of 4 pulses (signs only) + pos_indx[] -- array of type Word16 -- position index of 8 pulses + (position only) + pOverflow pointer to type Flag -- Flag set when overflow occurs + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + PURPOSE: decompression of the linear codewords to 4+three indeces + one bit from each pulse is made robust to errors by + minimizing the phase shift of a bit error. + 4 signs (one for each track) + i0,i4,i1 => one index (7+3) bits, 3 LSBs more robust + i2,i6,i5 => one index (7+3) bits, 3 LSBs more robust + i3,i7 => one index (5+2) bits, 2-3 LSbs more robust + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + d8_31pf.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] + +------------------------------------------------------------------------------ +*/ + +static void decompress_code( + Word16 indx[], /* i : position and sign of 8 pulses (compressed) */ + Word16 sign_indx[], /* o : signs of 4 pulses (signs only) */ + Word16 pos_indx[], /* o : position index of 8 pulses (position only) */ + Flag *pOverflow /* o : Flag set when overflow occurs */ +) +{ + Word16 i; + Word16 ia; + Word16 ib; + Word16 MSBs; + Word16 LSBs; + Word16 MSBs0_24; + Word32 tempWord32; + + for (i = 0; i < NB_TRACK_MR102; i++) + { + sign_indx[i] = indx[i]; + } + + /* + First index: 10x10x10 -> 2x5x2x5x2x5-> 125x2x2x2 -> 7+1x3 bits + MSBs = indx[NB_TRACK]/8; + LSBs = indx[NB_TRACK]%8; + */ + MSBs = indx[NB_TRACK_MR102] >> 3; + + LSBs = indx[NB_TRACK_MR102] & 0x7; + + decompress10( + MSBs, + LSBs, + 0, + 4, + 1, + pos_indx, + pOverflow); + + /* + Second index: 10x10x10 -> 2x5x2x5x2x5-> 125x2x2x2 -> 7+1x3 bits + MSBs = indx[NB_TRACK+1]/8; + LSBs = indx[NB_TRACK+1]%8; + */ + MSBs = indx[NB_TRACK_MR102+1] >> 3; + + LSBs = indx[NB_TRACK_MR102+1] & 0x7; + + decompress10( + MSBs, + LSBs, + 2, + 6, + 5, + pos_indx, + pOverflow); + + /* + Third index: 10x10 -> 2x5x2x5-> 25x2x2 -> 5+1x2 bits + MSBs = indx[NB_TRACK+2]/4; + LSBs = indx[NB_TRACK+2]%4; + MSBs0_24 = (MSBs*25+12)/32; + if ((MSBs0_24/5)%2==1) + pos_indx[3] = (4-(MSBs0_24%5))*2 + LSBs%2; + else + pos_indx[3] = (MSBs0_24%5)*2 + LSBs%2; + pos_indx[7] = (MSBs0_24/5)*2 + LSBs/2; + */ + + MSBs = indx[NB_TRACK_MR102+2] >> 2; + + LSBs = indx[NB_TRACK_MR102+2] & 0x3; + + tempWord32 = + L_mult( + MSBs, + 25, + pOverflow); + + ia = + (Word16) + L_shr( + tempWord32, + 1, + pOverflow); + + ia += 12; + + MSBs0_24 = ia >> 5; + + + ia = + mult( + MSBs0_24, + 6554, + pOverflow); + + ia &= 1; + + + ib = + mult( + MSBs0_24, + 6554, + pOverflow); + + tempWord32 = + L_mult( + ib, + 5, + pOverflow); + + + ib = MSBs0_24 - (Word16)(tempWord32 >> 1); + + if (ia == 1) + { + ib = 4 - ib; + + } + + + ib = + shl( + ib, + 1, + pOverflow); + + ia = LSBs & 0x1; + + pos_indx[3] = + add( + ib, + ia, + pOverflow); + + ia = + mult( + MSBs0_24, + 6554, + pOverflow); + + ia = + shl( + ia, + 1, + pOverflow); + + pos_indx[7] = ia + (LSBs >> 1); + +} + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: dec_8i40_31bits +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + index array of type Word16 -- index of 8 pulses (sign+position) + + Outputs: + cod array of type Word16 -- algebraic (fixed) codebook excitation + pOverflow pointer to type Flag -- Flag set when overflow occurs + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + PURPOSE: Builds the innovative codevector from the received + index of algebraic codebook. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + d8_31pf.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 dec_8i40_31bits( + Word16 index[], /* i : index of 8 pulses (sign+position) */ + Word16 cod[], /* o : algebraic (fixed) codebook excitation */ + Flag *pOverflow /* o : Flag set when overflow occurs */ +) +{ + Word16 i; + Word16 j; + Word16 pos1; + Word16 pos2; + Word16 sign; + + Word16 linear_signs[NB_TRACK_MR102]; + Word16 linear_codewords[NB_PULSE]; + + for (i = 0; i < L_CODE; i++) + { + cod[i] = 0; + } + + decompress_code( + index, + linear_signs, + linear_codewords, + pOverflow); + + /* decode the positions and signs of pulses and build the codeword */ + for (j = 0; j < NB_TRACK_MR102; j++) /* NB_TRACK_MR102 = 4 */ + { + /* position of pulse "j" */ + + pos1 = (linear_codewords[j] << 2) + j; + + + if (linear_signs[j] == 0) + { + sign = POS_CODE; /* +1.0 */ + } + else + { + sign = -NEG_CODE; /* -1.0 */ + } + + if (pos1 < L_SUBFR) + { + cod[pos1] = sign; /* avoid buffer overflow */ + } + + /* compute index i */ + /* position of pulse "j+4" */ + + pos2 = (linear_codewords[j + 4] << 2) + j; + + + if (pos2 < pos1) + { + sign = negate(sign); + } + + if (pos2 < L_SUBFR) + { + cod[pos2] += sign; /* avoid buffer overflow */ + } + + + } /* for (j = 0; j < NB_TRACK_MR102; j++) */ + + return; +} |