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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/spstproc.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/spstproc.cpp | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/spstproc.cpp b/media/libstagefright/codecs/amrnb/enc/src/spstproc.cpp new file mode 100644 index 0000000..b9574aa --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/spstproc.cpp @@ -0,0 +1,314 @@ +/* ------------------------------------------------------------------ + * 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/spstproc.c + Functions: subframePostProc + + Date: 02/06/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Updated template used to PV coding template. + Changed to accept the pOverflow flag for EPOC compatibility. + + Description: + 1. Eliminated unused include files. + 2. Replaced array addressing by pointers + 3. Eliminated math operations that unnecessary checked for + saturation + 4. Replaced loop counter with decrement loops + + Description: Added casting to eliminate warnings + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: + +------------------------------------------------------------------------------ + MODULE DESCRIPTION + + Subframe post processing +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "spstproc.h" +#include "syn_filt.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: subframePostProc +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + + Inputs: + speech -- Pointer to Word16 -- speech segment + mode -- enum Mode -- coder mode + i_subfr -- Word16 -- Subframe nr + gain_pit -- Word16 -- Pitch gain Q14 + gain_code -- Word16 -- Decoded innovation gain + Aq -- Pointer to Word16 -- A(z) quantized for the 4 subframes + synth -- Word16 Array -- Local synthesis + xn -- Word16 Array -- Target vector for pitch search + code -- Word16 Array -- Fixed codebook exitation + y1 -- Word16 Array -- Filtered adaptive exitation + y2 -- Word16 Array -- Filtered fixed codebook excitation + mem_syn -- Pointer to Word16 -- memory of synthesis filter + + Outputs: + mem_syn -- Pointer to Word16 -- memory of synthesis filter + mem_err -- Pointer to Word16 -- pointer to error signal + mem_w0 -- Pointer to Word16 -- memory of weighting filter + exc -- Pointer to Word16 -- long term prediction residual + sharp -- Pointer to Word16 -- pitch sharpening value + pOverflow -- Pointer to Flag -- overflow indicator + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + spstproc.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 subframePostProc( + Word16 *speech, /* i : speech segment */ + enum Mode mode, /* i : coder mode */ + Word16 i_subfr, /* i : Subframe nr */ + Word16 gain_pit, /* i : Pitch gain Q14 */ + Word16 gain_code, /* i : Decoded innovation gain */ + Word16 *Aq, /* i : A(z) quantized for the 4 subframes */ + Word16 synth[], /* i : Local snthesis */ + Word16 xn[], /* i : Target vector for pitch search */ + Word16 code[], /* i : Fixed codebook exitation */ + Word16 y1[], /* i : Filtered adaptive exitation */ + Word16 y2[], /* i : Filtered fixed codebook excitation */ + Word16 *mem_syn, /* i/o : memory of synthesis filter */ + Word16 *mem_err, /* o : pointer to error signal */ + Word16 *mem_w0, /* o : memory of weighting filter */ + Word16 *exc, /* o : long term prediction residual */ + Word16 *sharp, /* o : pitch sharpening value */ + Flag *pOverflow /* o : overflow indicator */ +) +{ + Word16 i; + Word16 j; + Word16 temp; + Word32 L_temp; + Word32 L_temp2; + Word16 tempShift; + Word16 kShift; + Word16 pitch_fac; + Word16 *p_exc; + Word16 *p_code; + + OSCL_UNUSED_ARG(pOverflow); + + if (mode != MR122) + { + tempShift = 1; + kShift = 16 - 2 - 1; + pitch_fac = gain_pit; + } + else + { + tempShift = 2; + kShift = 16 - 4 - 1; + pitch_fac = gain_pit >> 1; + } + + /*------------------------------------------------------------* + * - Update pitch sharpening "sharp" with quantized gain_pit * + *------------------------------------------------------------*/ + + if (gain_pit < SHARPMAX) + { + *sharp = gain_pit; + } + else + { + *sharp = SHARPMAX; + } + + /*------------------------------------------------------* + * - Find the total excitation * + * - find synthesis speech corresponding to exc[] * + * - update filters memories for finding the target * + * vector in the next subframe * + * (update error[-m..-1] and mem_w_err[]) * + *------------------------------------------------------*/ + + p_exc = &exc[ i_subfr]; + p_code = &code[0]; + + for (i = L_SUBFR >> 1; i != 0 ; i--) + { + /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */ + + /* + * 12k2 others + * --------------------------------- + * exc Q0 Q0 + * gain_pit Q14 Q14 + * pitch_fac Q13 Q14 + * product: Q14 Q15 + * + * code Q12 Q13 + * gain_code Q1 Q1 + * product Q14 Q15 + * sum Q14 Q15 + * + * tempShift 2 1 + * sum<<tempShift Q16 Q16 + * result -> exc Q0 Q0 + */ + L_temp = ((Word32) * (p_exc++) * pitch_fac) << 1; + L_temp2 = ((Word32) * (p_exc--) * pitch_fac) << 1; + L_temp += ((Word32) * (p_code++) * gain_code) << 1; + L_temp2 += ((Word32) * (p_code++) * gain_code) << 1; + L_temp <<= tempShift; + L_temp2 <<= tempShift; + *(p_exc++) = (Word16)((L_temp + 0x08000L) >> 16); + *(p_exc++) = (Word16)((L_temp2 + 0x08000L) >> 16); + + } + + Syn_filt( + Aq, + &exc[i_subfr], + &synth[i_subfr], + L_SUBFR, + mem_syn, + 1); + + for (i = L_SUBFR - M, j = 0; i < L_SUBFR; i++, j++) + { + mem_err[j] = speech[i_subfr + i] - synth[i_subfr + i]; + + /* + * 12k2 others + * --------------------------------- + * y1 Q0 Q0 + * gain_pit Q14 Q14 + * product Q15 Q15 + * shifted prod. Q16 Q16 + * temp Q0 Q0 + * + * y2 Q10 Q12 + * gain_code Q1 Q1 + * product Q12 Q14 + * kshift 4 2 + * shifted prod. Q16 Q16 + * k Q0 Q0 + * mem_w0,xn,sum Q0 Q0 + */ + + L_temp = ((Word32)y1[i] * gain_pit); + temp = (Word16)(L_temp >> 14); + + L_temp = ((Word32)y2[i] * gain_code); + temp += (Word16)(L_temp >> kShift); + + mem_w0[j] = xn[i] - temp; + } + + return; +} |