mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-27 22:33:10 +00:00
167 lines
8.3 KiB
C
167 lines
8.3 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, 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 Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
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.
|
|
***********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "main.h"
|
|
|
|
/* Generates excitation for CNG LPC synthesis */
|
|
static inline void silk_CNG_exc(
|
|
opus_int32 residual_Q10[], /* O CNG residual signal Q10 */
|
|
opus_int32 exc_buf_Q14[], /* I Random samples buffer Q10 */
|
|
opus_int32 Gain_Q16, /* I Gain to apply */
|
|
opus_int length, /* I Length */
|
|
opus_int32 *rand_seed /* I/O Seed to random index generator */
|
|
)
|
|
{
|
|
opus_int32 seed;
|
|
opus_int i, idx, exc_mask;
|
|
|
|
exc_mask = CNG_BUF_MASK_MAX;
|
|
while( exc_mask > length ) {
|
|
exc_mask = silk_RSHIFT( exc_mask, 1 );
|
|
}
|
|
|
|
seed = *rand_seed;
|
|
for( i = 0; i < length; i++ ) {
|
|
seed = silk_RAND( seed );
|
|
idx = (opus_int)( silk_RSHIFT( seed, 24 ) & exc_mask );
|
|
silk_assert( idx >= 0 );
|
|
silk_assert( idx <= CNG_BUF_MASK_MAX );
|
|
residual_Q10[ i ] = (opus_int16)silk_SAT16( silk_SMULWW( exc_buf_Q14[ idx ], Gain_Q16 >> 4 ) );
|
|
}
|
|
*rand_seed = seed;
|
|
}
|
|
|
|
void silk_CNG_Reset(
|
|
silk_decoder_state *psDec /* I/O Decoder state */
|
|
)
|
|
{
|
|
opus_int i, NLSF_step_Q15, NLSF_acc_Q15;
|
|
|
|
NLSF_step_Q15 = silk_DIV32_16( silk_int16_MAX, psDec->LPC_order + 1 );
|
|
NLSF_acc_Q15 = 0;
|
|
for( i = 0; i < psDec->LPC_order; i++ ) {
|
|
NLSF_acc_Q15 += NLSF_step_Q15;
|
|
psDec->sCNG.CNG_smth_NLSF_Q15[ i ] = NLSF_acc_Q15;
|
|
}
|
|
psDec->sCNG.CNG_smth_Gain_Q16 = 0;
|
|
psDec->sCNG.rand_seed = 3176576;
|
|
}
|
|
|
|
/* Updates CNG estimate, and applies the CNG when packet was lost */
|
|
void silk_CNG(
|
|
silk_decoder_state *psDec, /* I/O Decoder state */
|
|
silk_decoder_control *psDecCtrl, /* I/O Decoder control */
|
|
opus_int16 frame[], /* I/O Signal */
|
|
opus_int length /* I Length of residual */
|
|
)
|
|
{
|
|
opus_int i, subfr;
|
|
opus_int32 sum_Q6, max_Gain_Q16;
|
|
opus_int16 A_Q12[ MAX_LPC_ORDER ];
|
|
opus_int32 CNG_sig_Q10[ MAX_FRAME_LENGTH + MAX_LPC_ORDER ];
|
|
silk_CNG_struct *psCNG = &psDec->sCNG;
|
|
|
|
if( psDec->fs_kHz != psCNG->fs_kHz ) {
|
|
/* Reset state */
|
|
silk_CNG_Reset( psDec );
|
|
|
|
psCNG->fs_kHz = psDec->fs_kHz;
|
|
}
|
|
if( psDec->lossCnt == 0 && psDec->prevSignalType == TYPE_NO_VOICE_ACTIVITY ) {
|
|
/* Update CNG parameters */
|
|
|
|
/* Smoothing of LSF's */
|
|
for( i = 0; i < psDec->LPC_order; i++ ) {
|
|
psCNG->CNG_smth_NLSF_Q15[ i ] += silk_SMULWB( (opus_int32)psDec->prevNLSF_Q15[ i ] - (opus_int32)psCNG->CNG_smth_NLSF_Q15[ i ], CNG_NLSF_SMTH_Q16 );
|
|
}
|
|
/* Find the subframe with the highest gain */
|
|
max_Gain_Q16 = 0;
|
|
subfr = 0;
|
|
for( i = 0; i < psDec->nb_subfr; i++ ) {
|
|
if( psDecCtrl->Gains_Q16[ i ] > max_Gain_Q16 ) {
|
|
max_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];
|
|
subfr = i;
|
|
}
|
|
}
|
|
/* Update CNG excitation buffer with excitation from this subframe */
|
|
silk_memmove( &psCNG->CNG_exc_buf_Q14[ psDec->subfr_length ], psCNG->CNG_exc_buf_Q14, ( psDec->nb_subfr - 1 ) * psDec->subfr_length * sizeof( opus_int32 ) );
|
|
silk_memcpy( psCNG->CNG_exc_buf_Q14, &psDec->exc_Q14[ subfr * psDec->subfr_length ], psDec->subfr_length * sizeof( opus_int32 ) );
|
|
|
|
/* Smooth gains */
|
|
for( i = 0; i < psDec->nb_subfr; i++ ) {
|
|
psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
|
|
}
|
|
}
|
|
|
|
/* Add CNG when packet is lost or during DTX */
|
|
if( psDec->lossCnt ) {
|
|
|
|
/* Generate CNG excitation */
|
|
silk_CNG_exc( CNG_sig_Q10 + MAX_LPC_ORDER, psCNG->CNG_exc_buf_Q14, psCNG->CNG_smth_Gain_Q16, length, &psCNG->rand_seed );
|
|
|
|
/* Convert CNG NLSF to filter representation */
|
|
silk_NLSF2A( A_Q12, psCNG->CNG_smth_NLSF_Q15, psDec->LPC_order );
|
|
|
|
/* Generate CNG signal, by synthesis filtering */
|
|
silk_memcpy( CNG_sig_Q10, psCNG->CNG_synth_state, MAX_LPC_ORDER * sizeof( opus_int32 ) );
|
|
for( i = 0; i < length; i++ ) {
|
|
silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
|
|
/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
|
|
sum_Q6 = silk_RSHIFT( psDec->LPC_order, 1 );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 1 ], A_Q12[ 0 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 2 ], A_Q12[ 1 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 3 ], A_Q12[ 2 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 4 ], A_Q12[ 3 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 5 ], A_Q12[ 4 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 6 ], A_Q12[ 5 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 7 ], A_Q12[ 6 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 8 ], A_Q12[ 7 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 9 ], A_Q12[ 8 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
|
|
if( psDec->LPC_order == 16 ) {
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 11 ], A_Q12[ 10 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 12 ], A_Q12[ 11 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 13 ], A_Q12[ 12 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 14 ], A_Q12[ 13 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 15 ], A_Q12[ 14 ] );
|
|
sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 16 ], A_Q12[ 15 ] );
|
|
}
|
|
|
|
/* Update states */
|
|
CNG_sig_Q10[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT( CNG_sig_Q10[ MAX_LPC_ORDER + i ], sum_Q6, 4 );
|
|
|
|
frame[ i ] = silk_ADD_SAT16( frame[ i ], silk_RSHIFT_ROUND( sum_Q6, 6 ) );
|
|
}
|
|
silk_memcpy( psCNG->CNG_synth_state, &CNG_sig_Q10[ length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
|
|
} else {
|
|
silk_memset( psCNG->CNG_synth_state, 0, psDec->LPC_order * sizeof( opus_int32 ) );
|
|
}
|
|
}
|