ref: 103302b3752609e28cb6ba4f706a6f6e49ffef68
dir: /silk/silk_encode_indices.c/
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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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
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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
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include "silk_main.h"
/* Encode side-information parameters to payload */
void silk_encode_indices(
silk_encoder_state *psEncC, /* I/O Encoder state */
ec_enc *psRangeEnc, /* I/O Compressor data structure */
SKP_int FrameIndex, /* I Frame number */
SKP_int encode_LBRR /* I Flag indicating LBRR data is being encoded */
)
{
SKP_int i, k, condCoding, typeOffset;
SKP_int encode_absolute_lagIndex, delta_lagIndex;
SKP_int16 ec_ix[ MAX_LPC_ORDER ];
SKP_uint8 pred_Q8[ MAX_LPC_ORDER ];
const SideInfoIndices *psIndices;
#if SAVE_ALL_INTERNAL_DATA
SKP_int nBytes_lagIndex, nBytes_contourIndex, nBytes_LTP;
SKP_int nBytes_after, nBytes_before;
#endif
/* Use conditional coding if previous frame available */
if( FrameIndex > 0 && ( encode_LBRR == 0 || psEncC->LBRR_flags[ FrameIndex - 1 ] == 1 ) ) {
condCoding = 1;
} else {
condCoding = 0;
}
if( encode_LBRR ) {
psIndices = &psEncC->indices_LBRR[ FrameIndex ];
} else {
psIndices = &psEncC->indices;
}
/*******************************************/
/* Encode signal type and quantizer offset */
/*******************************************/
typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType;
SKP_assert( typeOffset >= 0 && typeOffset < 6 );
SKP_assert( encode_LBRR == 0 || typeOffset >= 2 );
if( encode_LBRR || typeOffset >= 2 ) {
ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 );
} else {
ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 );
}
/****************/
/* Encode gains */
/****************/
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
/* first subframe */
if( condCoding ) {
/* conditional coding */
SKP_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 );
} else {
/* independent coding, in two stages: MSB bits followed by 3 LSBs */
SKP_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN );
ec_enc_icdf( psRangeEnc, SKP_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 );
ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 );
}
/* remaining subframes */
for( i = 1; i < psEncC->nb_subfr; i++ ) {
SKP_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 );
}
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_after = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
nBytes_after -= nBytes_before; // bytes just added
DEBUG_STORE_DATA( nBytes_gains.dat, &nBytes_after, sizeof( SKP_int ) );
#endif
/****************/
/* Encode NLSFs */
/****************/
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 );
silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] );
SKP_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder );
for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) {
if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) {
ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
} else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) {
ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
} else {
ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
}
}
/* Encode NLSF interpolation factor */
if( psEncC->nb_subfr == MAX_NB_SUBFR ) {
SKP_assert( psEncC->useInterpolatedNLSFs == 1 || psIndices->NLSFInterpCoef_Q2 == ( 1 << 2 ) );
SKP_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 );
ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 );
}
#ifdef SAVE_ALL_INTERNAL_DATA
DEBUG_STORE_DATA( lsf_interpol.dat, &psIndices->NLSFInterpCoef_Q2, sizeof(int) );
nBytes_after = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
nBytes_after -= nBytes_before; // bytes just added
DEBUG_STORE_DATA( nBytes_LSF.dat, &nBytes_after, sizeof( SKP_int ) );
#endif
if( psIndices->signalType == TYPE_VOICED )
{
/*********************/
/* Encode pitch lags */
/*********************/
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
/* lag index */
encode_absolute_lagIndex = 1;
if( condCoding && psEncC->ec_prevSignalType == TYPE_VOICED ) {
/* Delta Encoding */
delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex;
if( delta_lagIndex < -8 || delta_lagIndex > 11 ) {
delta_lagIndex = 0;
} else {
delta_lagIndex = delta_lagIndex + 9;
encode_absolute_lagIndex = 0; /* Only use delta */
}
SKP_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 );
ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 );
}
if( encode_absolute_lagIndex ) {
/* Absolute encoding */
SKP_int32 pitch_high_bits, pitch_low_bits;
pitch_high_bits = SKP_DIV32_16( psIndices->lagIndex, SKP_RSHIFT( psEncC->fs_kHz, 1 ) );
pitch_low_bits = psIndices->lagIndex - SKP_SMULBB( pitch_high_bits, SKP_RSHIFT( psEncC->fs_kHz, 1 ) );
SKP_assert( pitch_low_bits < psEncC->fs_kHz / 2 );
SKP_assert( pitch_high_bits < 32 );
ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 );
ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 );
}
psEncC->ec_prevLagIndex = psIndices->lagIndex;
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_after = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
nBytes_lagIndex = nBytes_after - nBytes_before; // bytes just added
#endif
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
/* Countour index */
SKP_assert( psIndices->contourIndex >= 0 );
SKP_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 4 ) ||
( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) ||
( psIndices->contourIndex < 12 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 2 ) ||
( psIndices->contourIndex < 3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) );
ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 );
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_after = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
nBytes_contourIndex = nBytes_after - nBytes_before; // bytes just added
#endif
/********************/
/* Encode LTP gains */
/********************/
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
/* PERIndex value */
SKP_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 );
ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 );
/* Codebook Indices */
for( k = 0; k < psEncC->nb_subfr; k++ ) {
SKP_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) );
ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 );
}
/**********************/
/* Encode LTP scaling */
/**********************/
if( !condCoding ) {
SKP_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 );
ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 );
}
SKP_assert( !condCoding || psIndices->LTP_scaleIndex == 0 );
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_after = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
nBytes_LTP = nBytes_after - nBytes_before; // bytes just added
#endif
}
#ifdef SAVE_ALL_INTERNAL_DATA
else {
// Unvoiced speech
nBytes_lagIndex = 0;
nBytes_contourIndex = 0;
nBytes_LTP = 0;
}
DEBUG_STORE_DATA( nBytes_lagIndex.dat, &nBytes_lagIndex, sizeof( SKP_int ) );
DEBUG_STORE_DATA( nBytes_contourIndex.dat, &nBytes_contourIndex, sizeof( SKP_int ) );
DEBUG_STORE_DATA( nBytes_LTP.dat, &nBytes_LTP, sizeof( SKP_int ) );
#endif
psEncC->ec_prevSignalType = psIndices->signalType;
#ifdef SAVE_ALL_INTERNAL_DATA
nBytes_before = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
#endif
/***************/
/* Encode seed */
/***************/
SKP_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 );
ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 );
}