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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/pre_proc.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/pre_proc.cpp | 589 |
1 files changed, 589 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/pre_proc.cpp b/media/libstagefright/codecs/amrnb/enc/src/pre_proc.cpp new file mode 100644 index 0000000..fdc2440 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/pre_proc.cpp @@ -0,0 +1,589 @@ +/* ------------------------------------------------------------------ + * 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/pre_proc.c + Funtions: Pre_Process_init + Pre_Process_reset + Pre_Process_exit + Pre_Process + + Date: 05/17/2000 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Put the file into our template structure. + + Description: First pass optimization. + + Description: Made changes based on comments from review meeting. + + Description: Synchronized file with UMTS version 3.2.0. Updated coding + template. Removed unnecessary include files. + + Description: Removed basic_op.h from the Include section. It is not used. + + Description: Made the following changes per comments from Phase 2/3 review: + 1. Fixed typecasting issue with TI C compiler. + 2. Modified FOR loop to count down. + 3. Cosmetic changes to the code to make address post-increment + clearer. + 4. Removed unnecessary typecasting in the multiply-accumulate + portion of FOR loop body. + 5. Removed "static" in table definitions. + 6. Updated copyright year. + + Description: For Pre_Process() + 1. Replaced variables (containing filter coefficients) with + constants, to avoid extra register swaping. + 2. Changed to decrement loop + + 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: Changed round function name to pv_round to avoid conflict with + round function in C standard library. + + Description: + +------------------------------------------------------------------------------ + MODULE DESCRIPTION + + These modules handle the preprocessing of input speech. + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include <stdlib.h> + +#include "pre_proc.h" +#include "typedef.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_Process_init +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + state = pointer to an array of pointer to structures of type + Pre_ProcessState + + Outputs: + Structure pointed to by the pointer pointed to by state is + initialized to its reset value + state points to the allocated memory + + Returns: + return_value = 0 if memory was successfully initialized, + otherwise returns -1. + + Global Variables Used: + None. + + Local Variables Needed: + None. + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Allocates state memory and initializes state memory. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None. + +------------------------------------------------------------------------------ + REFERENCES + + pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +int Pre_Process_init (Pre_ProcessState **state) +{ + Pre_ProcessState* s; + + if (state == (Pre_ProcessState **) NULL){ + fprintf(stderr, "Pre_Process_init: invalid parameter\n"); + return -1; + } + *state = NULL; + + // allocate memory + if ((s= (Pre_ProcessState *) malloc(sizeof(Pre_ProcessState))) == NULL){ + fprintf(stderr, "Pre_Process_init: can not malloc state structure\n"); + return -1; + } + + Pre_Process_reset(s); + *state = s; + + return 0; +} + +------------------------------------------------------------------------------ + 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] + +------------------------------------------------------------------------------ +*/ + +Word16 Pre_Process_init(Pre_ProcessState **state) +{ + Pre_ProcessState* s; + + if (state == (Pre_ProcessState **) NULL) + { + /* fprintf(stderr, "Pre_Process_init: invalid parameter\n"); */ + return(-1); + } + *state = NULL; + + /* allocate memory */ + if ((s = (Pre_ProcessState *) malloc(sizeof(Pre_ProcessState))) == NULL) + { + /* fprintf(stderr, "Pre_Process_init: + can not malloc state structure\n"); */ + return(-1); + } + + Pre_Process_reset(s); + *state = s; + + return(0); +} + +/****************************************************************************/ + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: Pre_Process_reset +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + state = pointer to structure of type Pre_ProcessState + + Outputs: + Structure pointed to by state is initialized to zero. + + Returns: + return_value = 0 if memory was successfully reset, + otherwise returns -1. + + Global Variables Used: + None. + + Local Variables Needed: + None. + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Initializes state memory to zero. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None. + +------------------------------------------------------------------------------ + REFERENCES + + pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +int Pre_Process_reset (Pre_ProcessState *state) +{ + if (state == (Pre_ProcessState *) NULL){ + fprintf(stderr, "Pre_Process_reset: invalid parameter\n"); + return -1; + } + + state->y2_hi = 0; + state->y2_lo = 0; + state->y1_hi = 0; + state->y1_lo = 0; + state->x0 = 0; + state->x1 = 0; + + return 0; +} + +------------------------------------------------------------------------------ + 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] + +------------------------------------------------------------------------------ +*/ + +Word16 Pre_Process_reset(Pre_ProcessState *state) +{ + if (state == (Pre_ProcessState *) NULL) + { + /* fprintf(stderr, "Pre_Process_reset: invalid parameter\n"); */ + return(-1); + } + + state->y2_hi = 0; + state->y2_lo = 0; + state->y1_hi = 0; + state->y1_lo = 0; + state->x0 = 0; + state->x1 = 0; + + return(0); +} + +/****************************************************************************/ + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: Pre_Process_exit +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + state = a pointer to an array of pointers to structures of + type Pre_ProcessState + + Outputs: + state points to a NULL address + + Returns: + None. + + Global Variables Used: + None. + + Local Variables Needed: + None. + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + The memory used for state memory is freed. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None. + +------------------------------------------------------------------------------ + REFERENCES + + pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +void Pre_Process_exit (Pre_ProcessState **state) +{ + if (state == NULL || *state == NULL) + return; + + // deallocate memory + free(*state); + *state = NULL; + + 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 Pre_Process_exit(Pre_ProcessState **state) +{ + if (state == NULL || *state == NULL) + { + return; + } + + /* deallocate memory */ + free(*state); + *state = NULL; + + return; +} + +/****************************************************************************/ + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: Pre_Process +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + st = a pointer to a structure of type Pre_ProcessState + signal = input/output signal (Word16) + lg = length of signal (Word16) + + Outputs: + st points to the updated structure + + Returns: + return_value = 0 (int) + + Global Variables Used: + a = points to a buffer of filter coefficients + b = points to a buffer of filter coefficients + + Local Variables Needed: + None. + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This module performs the preprocessing of the input speech. + The signal is passed through a 2nd order high pass filtering with cut off + frequency at 80 Hz. The input is divided by two in the filtering process. + + y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b[2]*x[i-2]/2 + + a[1]*y[i-1] + a[2]*y[i-2]; + +------------------------------------------------------------------------------ + REQUIREMENTS + + None. + +------------------------------------------------------------------------------ + REFERENCES + + pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +int Pre_Process ( + Pre_ProcessState *st, + Word16 signal[], // input/output signal + Word16 lg) // lenght of signal +{ + Word16 i, x2; + Word32 L_tmp; + + for (i = 0; i < lg; i++) + { + x2 = st->x1; + st->x1 = st->x0; + st->x0 = signal[i]; + + // y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 + // + a[1]*y[i-1] + a[2] * y[i-2]; + + L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]); + L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2])); + L_tmp = L_mac (L_tmp, st->x0, b[0]); + L_tmp = L_mac (L_tmp, st->x1, b[1]); + L_tmp = L_mac (L_tmp, x2, b[2]); + L_tmp = L_shl (L_tmp, 3); + signal[i] = pv_round (L_tmp); + + st->y2_hi = st->y1_hi; + st->y2_lo = st->y1_lo; + L_Extract (L_tmp, &st->y1_hi, &st->y1_lo); + } + return 0; +} + +------------------------------------------------------------------------------ + 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] + +------------------------------------------------------------------------------ +*/ +/* + filter coefficients (fc = 80 Hz, coeff. b[] is divided by 2) + const Word16 b[3] = {1899, -3798, 1899}; + const Word16 a[3] = {4096, 7807, -3733}; + +*/ + +void Pre_Process( + Pre_ProcessState *st, + Word16 signal[], /* input/output signal */ + Word16 lg) /* length of signal */ +{ + register Word16 i; + Word16 x_n_2; + Word16 x_n_1; + Word32 L_tmp; + Word16 *p_signal = signal; + + x_n_2 = st->x1; + x_n_1 = st->x0; + + for (i = lg; i != 0; i--) + { + + + /* y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 */ + /* + a[1]*y[i-1] + a[2] * y[i-2]; */ + + L_tmp = ((Word32) st->y1_hi) * 7807; + L_tmp += (Word32)(((Word32) st->y1_lo * 7807) >> 15); + + L_tmp += ((Word32) st->y2_hi) * (-3733); + st->y2_hi = st->y1_hi; + L_tmp += (Word32)(((Word32) st->y2_lo * (-3733)) >> 15); + st->y2_lo = st->y1_lo; + + L_tmp += ((Word32) x_n_2) * 1899; + x_n_2 = x_n_1; + L_tmp += ((Word32) x_n_1) * (-3798); + x_n_1 = *(p_signal); + L_tmp += ((Word32) x_n_1) * 1899; + + + *(p_signal++) = (Word16)((L_tmp + 0x0000800L) >> 12); + + st->y1_hi = (Word16)(L_tmp >> 12); + st->y1_lo = (Word16)((L_tmp << 3) - ((Word32)(st->y1_hi) << 15)); + + } + + st->x1 = x_n_2; + st->x0 = x_n_1; + + return; +} + + |