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/***********************************************************************
Copyright (c) 2006-2010, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#ifndef SKP_SILK_MAIN_H
#define SKP_SILK_MAIN_H
#include "SKP_Silk_SigProc_FIX.h"
#include "SKP_Silk_define.h"
#include "SKP_Silk_structs.h"
#include "SKP_Silk_tables.h"
#include "SKP_Silk_PLC.h"
#include "SKP_debug.h"
#include "entenc.h"
#include "entdec.h"
#ifdef __cplusplus
extern "C"
{
#endif
/* Encodes signs of excitation */
void SKP_Silk_encode_signs(
ec_enc *psRangeEnc, /* I/O Compressor data structure */
const SKP_int8 q[], /* I pulse signal */
const SKP_int length, /* I length of input */
const SKP_int sigtype, /* I Signal type */
const SKP_int QuantOffsetType, /* I Quantization offset type */
const SKP_int RateLevelIndex /* I Rate Level Index */
);
/* Decodes signs of excitation */
void SKP_Silk_decode_signs(
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int q[], /* I/O pulse signal */
const SKP_int length, /* I length of output */
const SKP_int sigtype, /* I Signal type */
const SKP_int QuantOffsetType, /* I Quantization offset type */
const SKP_int RateLevelIndex /* I Rate Level Index */
);
/***************/
/* Shell coder */
/***************/
/* Encode quantization indices of excitation */
void SKP_Silk_encode_pulses(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const SKP_int sigtype, /* I Sigtype */
const SKP_int QuantOffsetType, /* I QuantOffsetType */
SKP_int8 q[], /* I quantization indices */
const SKP_int frame_length /* I Frame length */
);
/* Shell encoder, operates on one shell code frame of 16 pulses */
void SKP_Silk_shell_encoder(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const SKP_int *pulses0 /* I data: nonnegative pulse amplitudes */
);
/* Shell decoder, operates on one shell code frame of 16 pulses */
void SKP_Silk_shell_decoder(
SKP_int *pulses0, /* O data: nonnegative pulse amplitudes */
ec_dec *psRangeDec, /* I/O Compressor data structure */
const SKP_int pulses4 /* I number of pulses per pulse-subframe */
);
/***************/
/* Range coder */
/***************/
/* Range decoder for one symbol */
void SKP_Silk_range_decoder(
SKP_int data[], /* O uncompressed data */
ec_dec *psRangeDec, /* I/O Compressor data structure */
const SKP_uint16 prob[], /* I cumulative density function */
SKP_int probIx /* I initial (middle) entry of cdf */
);
/* Gain scalar quantization with hysteresis, uniform on log scale */
void SKP_Silk_gains_quant(
SKP_int ind[ MAX_NB_SUBFR ], /* O gain indices */
SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* I/O gains (quantized out) */
SKP_int *prev_ind, /* I/O last index in previous frame */
const SKP_int conditional, /* I first gain is delta coded if 1 */
const SKP_int nb_subfr /* I number of subframes */
);
/* Gains scalar dequantization, uniform on log scale */
void SKP_Silk_gains_dequant(
SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* O quantized gains */
const SKP_int ind[ MAX_NB_SUBFR ], /* I gain indices */
SKP_int *prev_ind, /* I/O last index in previous frame */
const SKP_int conditional, /* I first gain is delta coded if 1 */
const SKP_int nb_subfr /* I number of subframes */
);
/* Convert NLSF parameters to stable AR prediction filter coefficients */
void SKP_Silk_NLSF2A_stable(
SKP_int16 pAR_Q12[ MAX_LPC_ORDER ], /* O Stabilized AR coefs [LPC_order] */
const SKP_int pNLSF[ MAX_LPC_ORDER ], /* I NLSF vector [LPC_order] */
const SKP_int LPC_order /* I LPC/LSF order */
);
/* Interpolate two vectors */
void SKP_Silk_interpolate(
SKP_int xi[ MAX_LPC_ORDER ], /* O interpolated vector */
const SKP_int x0[ MAX_LPC_ORDER ], /* I first vector */
const SKP_int x1[ MAX_LPC_ORDER ], /* I second vector */
const SKP_int ifact_Q2, /* I interp. factor, weight on 2nd vector */
const SKP_int d /* I number of parameters */
);
/***********************************/
/* Noise shaping quantization (NSQ)*/
/***********************************/
void SKP_Silk_NSQ(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
SKP_Silk_encoder_control *psEncCtrlC, /* I Encoder Control */
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
const SKP_int16 x[], /* I prefiltered input signal */
SKP_int8 q[], /* O quantized qulse signal */
const SKP_int LSFInterpFactor_Q2, /* I LSF interpolation factor in Q2 */
const SKP_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Short term prediction coefficients */
const SKP_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I Long term prediction coefficients */
const SKP_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I */
const SKP_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int Tilt_Q14[ MAX_NB_SUBFR ], /* I Spectral tilt */
const SKP_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */
const SKP_int Lambda_Q10, /* I */
const SKP_int LTP_scale_Q14 /* I LTP state scaling */
);
/* Noise shaping using delayed decision */
void SKP_Silk_NSQ_del_dec(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
SKP_Silk_encoder_control *psEncCtrlC, /* I Encoder Control */
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
const SKP_int16 x[], /* I Prefiltered input signal */
SKP_int8 q[], /* O Quantized pulse signal */
const SKP_int LSFInterpFactor_Q2, /* I LSF interpolation factor in Q2 */
const SKP_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Prediction coefs */
const SKP_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I LT prediction coefs */
const SKP_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I */
const SKP_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int Tilt_Q14[ MAX_NB_SUBFR ], /* I Spectral tilt */
const SKP_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */
const SKP_int Lambda_Q10, /* I */
const SKP_int LTP_scale_Q14 /* I LTP state scaling */
);
/************/
/* Silk VAD */
/************/
/* Initialize the Silk VAD */
SKP_int SKP_Silk_VAD_Init( /* O Return value, 0 if success */
SKP_Silk_VAD_state *psSilk_VAD /* I/O Pointer to Silk VAD state */
);
/* Silk VAD noise level estimation */
void SKP_Silk_VAD_GetNoiseLevels(
const SKP_int32 pX[ VAD_N_BANDS ], /* I subband energies */
SKP_Silk_VAD_state *psSilk_VAD /* I/O Pointer to Silk VAD state */
);
/* Get speech activity level in Q8 */
SKP_int SKP_Silk_VAD_GetSA_Q8( /* O Return value, 0 if success */
SKP_Silk_VAD_state *psSilk_VAD, /* I/O Silk VAD state */
SKP_int *pSA_Q8, /* O Speech activity level in Q8 */
SKP_int pQuality_Q15[ VAD_N_BANDS ], /* O Smoothed SNR for each band */
SKP_int *pTilt_Q15, /* O current frame's frequency tilt */
const SKP_int16 pIn[], /* I PCM input [framelength] */
const SKP_int framelength, /* I Input frame length */
const SKP_int fs_kHz /* I Input frame sample frequency */
);
/* Detect signal in 8 - 12 khz range */
void SKP_Silk_detect_SWB_input(
SKP_Silk_detect_SWB_state *psSWBdetect, /* I/O Encoder state */
const SKP_int16 samplesIn[], /* I Input to encoder */
SKP_int nSamplesIn /* I Length of input */
);
#if SWITCH_TRANSITION_FILTERING
/* Low-pass filter with variable cutoff frequency based on */
/* piece-wise linear interpolation between elliptic filters */
/* Start by setting transition_frame_no = 1; */
void SKP_Silk_LP_variable_cutoff(
SKP_Silk_LP_state *psLP, /* I/O LP filter state */
SKP_int16 *out, /* O Low-pass filtered output signal */
const SKP_int16 *in, /* I Input signal */
const SKP_int frame_length /* I Frame length */
);
#endif
/****************************************************/
/* Decoder Functions */
/****************************************************/
SKP_int SKP_Silk_create_decoder(
SKP_Silk_decoder_state **ppsDec /* I/O Decoder state pointer pointer */
);
SKP_int SKP_Silk_free_decoder(
SKP_Silk_decoder_state *psDec /* I/O Decoder state pointer */
);
SKP_int SKP_Silk_init_decoder(
SKP_Silk_decoder_state *psDec /* I/O Decoder state pointer */
);
/* Set decoder sampling rate */
void SKP_Silk_decoder_set_fs(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state pointer */
SKP_int fs_kHz, /* I Sampling frequency (kHz) */
SKP_int nb_subfr /* I Number of subframes */
);
/****************/
/* Decode frame */
/****************/
SKP_int SKP_Silk_decode_frame(
SKP_Silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int16 pOut[], /* O Pointer to output speech frame */
SKP_int16 *pN, /* O Pointer to size of output frame */
const SKP_int nBytes, /* I Payload length */
SKP_int action, /* I Action from Jitter Buffer */
SKP_int *decBytes /* O Used bytes to decode this frame */
);
/* Decode indices from payload v4 Bitstream */
void SKP_Silk_decode_indices(
SKP_Silk_decoder_state *psDec, /* I/O State */
ec_dec *psRangeDec /* I/O Compressor data structure */
);
/* Decode parameters from payload v4 Bitstream */
void SKP_Silk_decode_parameters(
SKP_Silk_decoder_state *psDec, /* I/O State */
SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int q[ MAX_FRAME_LENGTH ], /* O Excitation signal */
const SKP_int fullDecoding /* I Flag to tell if only arithmetic decoding */
);
/* Core decoder. Performs inverse NSQ operation LTP + LPC */
void SKP_Silk_decode_core(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state */
SKP_Silk_decoder_control *psDecCtrl, /* I Decoder control */
SKP_int16 xq[], /* O Decoded speech */
const SKP_int q[ MAX_FRAME_LENGTH ] /* I Pulse signal */
);
/* NLSF vector decoder */
void SKP_Silk_NLSF_MSVQ_decode(
SKP_int *pNLSF_Q15, /* O Pointer to decoded output [LPC_ORDER x 1] */
const SKP_Silk_NLSF_CB_struct *psNLSF_CB, /* I Pointer to NLSF codebook struct */
const SKP_int *NLSFIndices, /* I Pointer to NLSF indices [nStages x 1] */
const SKP_int LPC_order /* I LPC order */
);
/**********************/
/* Arithmetic coding */
/*********************/
/* Decode quantization indices of excitation (Shell coding) */
void SKP_Silk_decode_pulses(
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
SKP_int q[], /* O Excitation signal */
const SKP_int frame_length /* I Frame length (preliminary) */
);
/******************/
/* CNG */
/******************/
/* Reset CNG */
void SKP_Silk_CNG_Reset(
SKP_Silk_decoder_state *psDec /* I/O Decoder state */
);
/* Updates CNG estimate, and applies the CNG when packet was lost */
void SKP_Silk_CNG(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state */
SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
SKP_int16 signal[], /* I/O Signal */
SKP_int length /* I Length of residual */
);
/* Encoding of various parameters */
void SKP_Silk_encode_parameters(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
SKP_Silk_encoder_control *psEncCtrlC, /* I/O Encoder control */
ec_enc *psRangeEnc /* I/O Compressor data structure */
);
/* Extract lowest layer encoding */
void SKP_Silk_get_low_layer_internal(
const SKP_uint8 *indata, /* I: Encoded input vector */
const SKP_int16 nBytesIn, /* I: Number of input Bytes */
SKP_uint8 *Layer0data, /* O: Layer0 payload */
SKP_int16 *nLayer0Bytes /* O: Number of FEC Bytes */
);
/* Resets LBRR buffer, used if packet size changes */
void SKP_Silk_LBRR_reset(
SKP_Silk_encoder_state *psEncC /* I/O Pointer to Silk encoder state */
);
/* Predict number of bytes used to encode q */
SKP_int SKP_Silk_pulses_to_bytes( /* O Return value, predicted number of bytes used to encode q */
SKP_Silk_encoder_state *psEncC, /* I/O Encoder State*/
SKP_int8 q[] /* I Pulse signal */
);
#ifdef __cplusplus
}
#endif
#endif
|
