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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
define.h
******************************************************************/
#ifndef MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_DEFINES_H_
#define MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_DEFINES_H_
#include <stdint.h>
#include <string.h>
#include "common_audio/signal_processing/include/signal_processing_library.h"
/* general codec settings */
#define FS 8000
#define BLOCKL_20MS 160
#define BLOCKL_30MS 240
#define BLOCKL_MAX 240
#define NSUB_20MS 4
#define NSUB_30MS 6
#define NSUB_MAX 6
#define NASUB_20MS 2
#define NASUB_30MS 4
#define NASUB_MAX 4
#define SUBL 40
#define STATE_LEN 80
#define STATE_SHORT_LEN_30MS 58
#define STATE_SHORT_LEN_20MS 57
/* LPC settings */
#define LPC_FILTERORDER 10
#define LPC_LOOKBACK 60
#define LPC_N_20MS 1
#define LPC_N_30MS 2
#define LPC_N_MAX 2
#define LPC_ASYMDIFF 20
#define LSF_NSPLIT 3
#define LSF_NUMBER_OF_STEPS 4
#define LPC_HALFORDER 5
#define COS_GRID_POINTS 60
/* cb settings */
#define CB_NSTAGES 3
#define CB_EXPAND 2
#define CB_MEML 147
#define CB_FILTERLEN (2 * 4)
#define CB_HALFFILTERLEN 4
#define CB_RESRANGE 34
#define CB_MAXGAIN_FIXQ6 83 /* error = -0.24% */
#define CB_MAXGAIN_FIXQ14 21299
/* enhancer */
#define ENH_BLOCKL 80 /* block length */
#define ENH_BLOCKL_HALF (ENH_BLOCKL / 2)
#define ENH_HL \
3 /* 2*ENH_HL+1 is number blocks \
in said second \
sequence */
#define ENH_SLOP \
2 /* max difference estimated and \
correct pitch period */
#define ENH_PLOCSL \
8 /* pitch-estimates and \
pitch-locations buffer \
length */
#define ENH_OVERHANG 2
#define ENH_UPS0 4 /* upsampling rate */
#define ENH_FL0 3 /* 2*FLO+1 is the length of each filter */
#define ENH_FLO_MULT2_PLUS1 7
#define ENH_VECTL (ENH_BLOCKL + 2 * ENH_FL0)
#define ENH_CORRDIM (2 * ENH_SLOP + 1)
#define ENH_NBLOCKS (BLOCKL / ENH_BLOCKL)
#define ENH_NBLOCKS_EXTRA 5
#define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS+ENH_NBLOCKS_EXTRA */
#define ENH_BUFL (ENH_NBLOCKS_TOT) * ENH_BLOCKL
#define ENH_BUFL_FILTEROVERHEAD 3
#define ENH_A0 819 /* Q14 */
#define ENH_A0_MINUS_A0A0DIV4 848256041 /* Q34 */
#define ENH_A0DIV2 26843546 /* Q30 */
/* PLC */
/* Down sampling */
#define FILTERORDER_DS_PLUS1 7
#define DELAY_DS 3
#define FACTOR_DS 2
/* bit stream defs */
#define NO_OF_BYTES_20MS 38
#define NO_OF_BYTES_30MS 50
#define NO_OF_WORDS_20MS 19
#define NO_OF_WORDS_30MS 25
#define STATE_BITS 3
#define BYTE_LEN 8
#define ULP_CLASSES 3
/* help parameters */
#define TWO_PI_FIX 25736 /* Q12 */
/* Constants for codebook search and creation */
#define ST_MEM_L_TBL 85
#define MEM_LF_TBL 147
/* Struct for the bits */
typedef struct iLBC_bits_t_ {
int16_t lsf[LSF_NSPLIT * LPC_N_MAX];
int16_t cb_index[CB_NSTAGES * (NASUB_MAX + 1)]; /* First CB_NSTAGES values
contains extra CB index */
int16_t gain_index[CB_NSTAGES * (NASUB_MAX + 1)]; /* First CB_NSTAGES values
contains extra CB gain */
size_t idxForMax;
int16_t state_first;
int16_t idxVec[STATE_SHORT_LEN_30MS];
int16_t firstbits;
size_t startIdx;
} iLBC_bits;
/* type definition encoder instance */
typedef struct IlbcEncoder_ {
/* flag for frame size mode */
int16_t mode;
/* basic parameters for different frame sizes */
size_t blockl;
size_t nsub;
int16_t nasub;
size_t no_of_bytes, no_of_words;
int16_t lpc_n;
size_t state_short_len;
/* analysis filter state */
int16_t anaMem[LPC_FILTERORDER];
/* Fix-point old lsf parameters for interpolation */
int16_t lsfold[LPC_FILTERORDER];
int16_t lsfdeqold[LPC_FILTERORDER];
/* signal buffer for LP analysis */
int16_t lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX];
/* state of input HP filter */
int16_t hpimemx[2];
int16_t hpimemy[4];
#ifdef SPLIT_10MS
int16_t weightdenumbuf[66];
int16_t past_samples[160];
uint16_t bytes[25];
int16_t section;
int16_t Nfor_flag;
int16_t Nback_flag;
int16_t start_pos;
size_t diff;
#endif
} IlbcEncoder;
/* type definition decoder instance */
typedef struct IlbcDecoder_ {
/* flag for frame size mode */
int16_t mode;
/* basic parameters for different frame sizes */
size_t blockl;
size_t nsub;
int16_t nasub;
size_t no_of_bytes, no_of_words;
int16_t lpc_n;
size_t state_short_len;
/* synthesis filter state */
int16_t syntMem[LPC_FILTERORDER];
/* old LSF for interpolation */
int16_t lsfdeqold[LPC_FILTERORDER];
/* pitch lag estimated in enhancer and used in PLC */
size_t last_lag;
/* PLC state information */
int consPLICount, prev_enh_pl;
int16_t perSquare;
int16_t prevScale, prevPLI;
size_t prevLag;
int16_t prevLpc[LPC_FILTERORDER + 1];
int16_t prevResidual[NSUB_MAX * SUBL];
int16_t seed;
/* previous synthesis filter parameters */
int16_t old_syntdenum[(LPC_FILTERORDER + 1) * NSUB_MAX];
/* state of output HP filter */
int16_t hpimemx[2];
int16_t hpimemy[4];
/* enhancer state information */
int use_enhancer;
int16_t enh_buf[ENH_BUFL + ENH_BUFL_FILTEROVERHEAD];
size_t enh_period[ENH_NBLOCKS_TOT];
} IlbcDecoder;
#endif