gecko/media/libopus/silk/NLSF_encode.c
Ralph Giles 3ae1b38243 Bug 916807 - Update opus to 1.1 prerelease. r=derf
Update our opus implementation to a prerelease of 1.1. This
brings many performance and encoder improvements and we believe
it is stable enough to switch. This import does not enable any
of the new assembly optimizations.

The imported code is https://git.xiph.org/opus.git master
commit f2446c25c6519bae190152f7a579310b83dc43fd.
2013-09-16 14:48:00 -07:00

137 lines
6.4 KiB
C

/***********************************************************************
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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
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main.h"
#include "stack_alloc.h"
/***********************/
/* NLSF vector encoder */
/***********************/
opus_int32 silk_NLSF_encode( /* O Returns RD value in Q25 */
opus_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
opus_int16 *pNLSF_Q15, /* I/O Quantized NLSF vector [ LPC_ORDER ] */
const silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
const opus_int16 *pW_QW, /* I NLSF weight vector [ LPC_ORDER ] */
const opus_int NLSF_mu_Q20, /* I Rate weight for the RD optimization */
const opus_int nSurvivors, /* I Max survivors after first stage */
const opus_int signalType /* I Signal type: 0/1/2 */
)
{
opus_int i, s, ind1, bestIndex, prob_Q8, bits_q7;
opus_int32 W_tmp_Q9;
VARDECL( opus_int32, err_Q26 );
VARDECL( opus_int32, RD_Q25 );
VARDECL( opus_int, tempIndices1 );
VARDECL( opus_int8, tempIndices2 );
opus_int16 res_Q15[ MAX_LPC_ORDER ];
opus_int16 res_Q10[ MAX_LPC_ORDER ];
opus_int16 NLSF_tmp_Q15[ MAX_LPC_ORDER ];
opus_int16 W_tmp_QW[ MAX_LPC_ORDER ];
opus_int16 W_adj_Q5[ MAX_LPC_ORDER ];
opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
opus_int16 ec_ix[ MAX_LPC_ORDER ];
const opus_uint8 *pCB_element, *iCDF_ptr;
SAVE_STACK;
silk_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
silk_assert( signalType >= 0 && signalType <= 2 );
silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
/* NLSF stabilization */
silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
/* First stage: VQ */
ALLOC( err_Q26, psNLSF_CB->nVectors, opus_int32 );
silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
/* Sort the quantization errors */
ALLOC( tempIndices1, nSurvivors, opus_int );
silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
ALLOC( RD_Q25, nSurvivors, opus_int32 );
ALLOC( tempIndices2, nSurvivors * MAX_LPC_ORDER, opus_int8 );
/* Loop over survivors */
for( s = 0; s < nSurvivors; s++ ) {
ind1 = tempIndices1[ s ];
/* Residual after first stage */
pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
for( i = 0; i < psNLSF_CB->order; i++ ) {
NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
}
/* Weights from codebook vector */
silk_NLSF_VQ_weights_laroia( W_tmp_QW, NLSF_tmp_Q15, psNLSF_CB->order );
/* Apply square-rooted weights */
for( i = 0; i < psNLSF_CB->order; i++ ) {
W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
}
/* Modify input weights accordingly */
for( i = 0; i < psNLSF_CB->order; i++ ) {
W_adj_Q5[ i ] = silk_DIV32_16( silk_LSHIFT( (opus_int32)pW_QW[ i ], 5 ), W_tmp_QW[ i ] );
}
/* Unpack entropy table indices and predictor for current CB1 index */
silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
/* Trellis quantizer */
RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
/* Add rate for first stage */
iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
if( ind1 == 0 ) {
prob_Q8 = 256 - iCDF_ptr[ ind1 ];
} else {
prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
}
bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
}
/* Find the lowest rate-distortion error */
silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
/* Decode */
silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
RESTORE_STACK;
return RD_Q25[ 0 ];
}