236 lines
9.7 KiB
C
236 lines
9.7 KiB
C
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/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifndef SILK_DEFINE_H
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#define SILK_DEFINE_H
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#include "errors.h"
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#include "typedef.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Max number of encoder channels (1/2) */
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#define ENCODER_NUM_CHANNELS 2
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/* Number of decoder channels (1/2) */
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#define DECODER_NUM_CHANNELS 2
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#define MAX_FRAMES_PER_PACKET 3
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/* Limits on bitrate */
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#define MIN_TARGET_RATE_BPS 5000
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#define MAX_TARGET_RATE_BPS 80000
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#define TARGET_RATE_TAB_SZ 8
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/* LBRR thresholds */
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#define LBRR_NB_MIN_RATE_BPS 12000
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#define LBRR_MB_MIN_RATE_BPS 14000
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#define LBRR_WB_MIN_RATE_BPS 16000
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/* DTX settings */
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#define NB_SPEECH_FRAMES_BEFORE_DTX 10 /* eq 200 ms */
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#define MAX_CONSECUTIVE_DTX 20 /* eq 400 ms */
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/* Maximum sampling frequency */
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#define MAX_FS_KHZ 16
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#define MAX_API_FS_KHZ 48
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/* Signal types */
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#define TYPE_NO_VOICE_ACTIVITY 0
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#define TYPE_UNVOICED 1
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#define TYPE_VOICED 2
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/* Conditional coding types */
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#define CODE_INDEPENDENTLY 0
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#define CODE_INDEPENDENTLY_NO_LTP_SCALING 1
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#define CODE_CONDITIONALLY 2
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/* Settings for stereo processing */
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#define STEREO_QUANT_TAB_SIZE 16
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#define STEREO_QUANT_SUB_STEPS 5
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#define STEREO_INTERP_LEN_MS 8 /* must be even */
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#define STEREO_RATIO_SMOOTH_COEF 0.01 /* smoothing coef for signal norms and stereo width */
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/* Range of pitch lag estimates */
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#define PITCH_EST_MIN_LAG_MS 2 /* 2 ms -> 500 Hz */
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#define PITCH_EST_MAX_LAG_MS 18 /* 18 ms -> 56 Hz */
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/* Maximum number of subframes */
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#define MAX_NB_SUBFR 4
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/* Number of samples per frame */
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#define LTP_MEM_LENGTH_MS 20
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#define SUB_FRAME_LENGTH_MS 5
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#define MAX_SUB_FRAME_LENGTH ( SUB_FRAME_LENGTH_MS * MAX_FS_KHZ )
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#define MAX_FRAME_LENGTH_MS ( SUB_FRAME_LENGTH_MS * MAX_NB_SUBFR )
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#define MAX_FRAME_LENGTH ( MAX_FRAME_LENGTH_MS * MAX_FS_KHZ )
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/* Milliseconds of lookahead for pitch analysis */
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#define LA_PITCH_MS 2
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#define LA_PITCH_MAX ( LA_PITCH_MS * MAX_FS_KHZ )
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/* Order of LPC used in find pitch */
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#define MAX_FIND_PITCH_LPC_ORDER 16
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/* Length of LPC window used in find pitch */
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#define FIND_PITCH_LPC_WIN_MS ( 20 + (LA_PITCH_MS << 1) )
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#define FIND_PITCH_LPC_WIN_MS_2_SF ( 10 + (LA_PITCH_MS << 1) )
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#define FIND_PITCH_LPC_WIN_MAX ( FIND_PITCH_LPC_WIN_MS * MAX_FS_KHZ )
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/* Milliseconds of lookahead for noise shape analysis */
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#define LA_SHAPE_MS 5
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#define LA_SHAPE_MAX ( LA_SHAPE_MS * MAX_FS_KHZ )
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/* Maximum length of LPC window used in noise shape analysis */
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#define SHAPE_LPC_WIN_MAX ( 15 * MAX_FS_KHZ )
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/* dB level of lowest gain quantization level */
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#define MIN_QGAIN_DB 2
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/* dB level of highest gain quantization level */
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#define MAX_QGAIN_DB 88
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/* Number of gain quantization levels */
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#define N_LEVELS_QGAIN 64
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/* Max increase in gain quantization index */
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#define MAX_DELTA_GAIN_QUANT 36
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/* Max decrease in gain quantization index */
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#define MIN_DELTA_GAIN_QUANT -4
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/* Quantization offsets (multiples of 4) */
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#define OFFSET_VL_Q10 32
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#define OFFSET_VH_Q10 100
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#define OFFSET_UVL_Q10 100
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#define OFFSET_UVH_Q10 240
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#define QUANT_LEVEL_ADJUST_Q10 80
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/* Maximum numbers of iterations used to stabilize an LPC vector */
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#define MAX_LPC_STABILIZE_ITERATIONS 16
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#define MAX_PREDICTION_POWER_GAIN 1e4f
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#define MAX_PREDICTION_POWER_GAIN_AFTER_RESET 1e2f
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#define MAX_LPC_ORDER 16
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#define MIN_LPC_ORDER 10
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/* Find Pred Coef defines */
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#define LTP_ORDER 5
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/* LTP quantization settings */
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#define NB_LTP_CBKS 3
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/* Flag to use harmonic noise shaping */
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#define USE_HARM_SHAPING 1
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/* Max LPC order of noise shaping filters */
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#define MAX_SHAPE_LPC_ORDER 16
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#define HARM_SHAPE_FIR_TAPS 3
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/* Maximum number of delayed decision states */
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#define MAX_DEL_DEC_STATES 4
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#define LTP_BUF_LENGTH 512
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#define LTP_MASK ( LTP_BUF_LENGTH - 1 )
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#define DECISION_DELAY 32
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#define DECISION_DELAY_MASK ( DECISION_DELAY - 1 )
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/* Number of subframes for excitation entropy coding */
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#define SHELL_CODEC_FRAME_LENGTH 16
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#define LOG2_SHELL_CODEC_FRAME_LENGTH 4
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#define MAX_NB_SHELL_BLOCKS ( MAX_FRAME_LENGTH / SHELL_CODEC_FRAME_LENGTH )
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/* Number of rate levels, for entropy coding of excitation */
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#define N_RATE_LEVELS 10
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/* Maximum sum of pulses per shell coding frame */
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#define MAX_PULSES 16
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#define MAX_MATRIX_SIZE MAX_LPC_ORDER /* Max of LPC Order and LTP order */
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#if( MAX_LPC_ORDER > DECISION_DELAY )
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# define NSQ_LPC_BUF_LENGTH MAX_LPC_ORDER
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#else
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# define NSQ_LPC_BUF_LENGTH DECISION_DELAY
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#endif
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/***************************/
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/* Voice activity detector */
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/***************************/
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#define VAD_N_BANDS 4
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#define VAD_INTERNAL_SUBFRAMES_LOG2 2
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#define VAD_INTERNAL_SUBFRAMES ( 1 << VAD_INTERNAL_SUBFRAMES_LOG2 )
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#define VAD_NOISE_LEVEL_SMOOTH_COEF_Q16 1024 /* Must be < 4096 */
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#define VAD_NOISE_LEVELS_BIAS 50
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/* Sigmoid settings */
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#define VAD_NEGATIVE_OFFSET_Q5 128 /* sigmoid is 0 at -128 */
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#define VAD_SNR_FACTOR_Q16 45000
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/* smoothing for SNR measurement */
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#define VAD_SNR_SMOOTH_COEF_Q18 4096
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/* Size of the piecewise linear cosine approximation table for the LSFs */
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#define LSF_COS_TAB_SZ_FIX 128
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/******************/
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/* NLSF quantizer */
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/******************/
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#define NLSF_W_Q 2
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#define NLSF_VQ_MAX_VECTORS 32
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#define NLSF_VQ_MAX_SURVIVORS 32
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#define NLSF_QUANT_MAX_AMPLITUDE 4
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#define NLSF_QUANT_MAX_AMPLITUDE_EXT 10
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#define NLSF_QUANT_LEVEL_ADJ 0.1
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#define NLSF_QUANT_DEL_DEC_STATES_LOG2 2
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#define NLSF_QUANT_DEL_DEC_STATES ( 1 << NLSF_QUANT_DEL_DEC_STATES_LOG2 )
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/* Transition filtering for mode switching */
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#define TRANSITION_TIME_MS 5120 /* 5120 = 64 * FRAME_LENGTH_MS * ( TRANSITION_INT_NUM - 1 ) = 64*(20*4)*/
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#define TRANSITION_NB 3 /* Hardcoded in tables */
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#define TRANSITION_NA 2 /* Hardcoded in tables */
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#define TRANSITION_INT_NUM 5 /* Hardcoded in tables */
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#define TRANSITION_FRAMES ( TRANSITION_TIME_MS / MAX_FRAME_LENGTH_MS )
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#define TRANSITION_INT_STEPS ( TRANSITION_FRAMES / ( TRANSITION_INT_NUM - 1 ) )
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/* BWE factors to apply after packet loss */
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#define BWE_AFTER_LOSS_Q16 63570
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/* Defines for CN generation */
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#define CNG_BUF_MASK_MAX 255 /* 2^floor(log2(MAX_FRAME_LENGTH))-1 */
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#define CNG_GAIN_SMTH_Q16 4634 /* 0.25^(1/4) */
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#define CNG_NLSF_SMTH_Q16 16348 /* 0.25 */
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#ifdef __cplusplus
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}
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#endif
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#endif
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