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