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238 lines
12 KiB
C
238 lines
12 KiB
C
/***********************************************************************
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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#include "stack_alloc.h"
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/**********************************************************/
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/* Core decoder. Performs inverse NSQ operation LTP + LPC */
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/**********************************************************/
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void silk_decode_core(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl, /* I Decoder control */
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opus_int16 xq[], /* O Decoded speech */
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const opus_int pulses[ MAX_FRAME_LENGTH ] /* I Pulse signal */
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)
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{
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opus_int i, k, lag = 0, start_idx, sLTP_buf_idx, NLSF_interpolation_flag, signalType;
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opus_int16 *A_Q12, *B_Q14, *pxq, A_Q12_tmp[ MAX_LPC_ORDER ];
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VARDECL( opus_int16, sLTP );
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VARDECL( opus_int32, sLTP_Q15 );
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opus_int32 LTP_pred_Q13, LPC_pred_Q10, Gain_Q10, inv_gain_Q31, gain_adj_Q16, rand_seed, offset_Q10;
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opus_int32 *pred_lag_ptr, *pexc_Q14, *pres_Q14;
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VARDECL( opus_int32, res_Q14 );
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VARDECL( opus_int32, sLPC_Q14 );
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SAVE_STACK;
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silk_assert( psDec->prev_gain_Q16 != 0 );
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ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
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ALLOC( sLTP_Q15, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
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ALLOC( res_Q14, psDec->subfr_length, opus_int32 );
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ALLOC( sLPC_Q14, psDec->subfr_length + MAX_LPC_ORDER, opus_int32 );
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offset_Q10 = silk_Quantization_Offsets_Q10[ psDec->indices.signalType >> 1 ][ psDec->indices.quantOffsetType ];
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if( psDec->indices.NLSFInterpCoef_Q2 < 1 << 2 ) {
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NLSF_interpolation_flag = 1;
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} else {
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NLSF_interpolation_flag = 0;
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}
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/* Decode excitation */
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rand_seed = psDec->indices.Seed;
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for( i = 0; i < psDec->frame_length; i++ ) {
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rand_seed = silk_RAND( rand_seed );
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psDec->exc_Q14[ i ] = silk_LSHIFT( (opus_int32)pulses[ i ], 14 );
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if( psDec->exc_Q14[ i ] > 0 ) {
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psDec->exc_Q14[ i ] -= QUANT_LEVEL_ADJUST_Q10 << 4;
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} else
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if( psDec->exc_Q14[ i ] < 0 ) {
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psDec->exc_Q14[ i ] += QUANT_LEVEL_ADJUST_Q10 << 4;
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}
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psDec->exc_Q14[ i ] += offset_Q10 << 4;
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if( rand_seed < 0 ) {
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psDec->exc_Q14[ i ] = -psDec->exc_Q14[ i ];
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}
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rand_seed = silk_ADD32_ovflw( rand_seed, pulses[ i ] );
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}
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/* Copy LPC state */
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silk_memcpy( sLPC_Q14, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );
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pexc_Q14 = psDec->exc_Q14;
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pxq = xq;
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sLTP_buf_idx = psDec->ltp_mem_length;
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/* Loop over subframes */
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for( k = 0; k < psDec->nb_subfr; k++ ) {
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pres_Q14 = res_Q14;
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A_Q12 = psDecCtrl->PredCoef_Q12[ k >> 1 ];
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/* Preload LPC coeficients to array on stack. Gives small performance gain */
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silk_memcpy( A_Q12_tmp, A_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
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B_Q14 = &psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER ];
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signalType = psDec->indices.signalType;
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Gain_Q10 = silk_RSHIFT( psDecCtrl->Gains_Q16[ k ], 6 );
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inv_gain_Q31 = silk_INVERSE32_varQ( psDecCtrl->Gains_Q16[ k ], 47 );
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/* Calculate gain adjustment factor */
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if( psDecCtrl->Gains_Q16[ k ] != psDec->prev_gain_Q16 ) {
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gain_adj_Q16 = silk_DIV32_varQ( psDec->prev_gain_Q16, psDecCtrl->Gains_Q16[ k ], 16 );
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/* Scale short term state */
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for( i = 0; i < MAX_LPC_ORDER; i++ ) {
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sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, sLPC_Q14[ i ] );
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}
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} else {
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gain_adj_Q16 = (opus_int32)1 << 16;
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}
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/* Save inv_gain */
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silk_assert( inv_gain_Q31 != 0 );
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psDec->prev_gain_Q16 = psDecCtrl->Gains_Q16[ k ];
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/* Avoid abrupt transition from voiced PLC to unvoiced normal decoding */
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if( psDec->lossCnt && psDec->prevSignalType == TYPE_VOICED &&
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psDec->indices.signalType != TYPE_VOICED && k < MAX_NB_SUBFR/2 ) {
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silk_memset( B_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
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B_Q14[ LTP_ORDER/2 ] = SILK_FIX_CONST( 0.25, 14 );
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signalType = TYPE_VOICED;
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psDecCtrl->pitchL[ k ] = psDec->lagPrev;
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}
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if( signalType == TYPE_VOICED ) {
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/* Voiced */
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lag = psDecCtrl->pitchL[ k ];
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/* Re-whitening */
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if( k == 0 || ( k == 2 && NLSF_interpolation_flag ) ) {
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/* Rewhiten with new A coefs */
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start_idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
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silk_assert( start_idx > 0 );
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if( k == 2 ) {
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silk_memcpy( &psDec->outBuf[ psDec->ltp_mem_length ], xq, 2 * psDec->subfr_length * sizeof( opus_int16 ) );
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}
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silk_LPC_analysis_filter( &sLTP[ start_idx ], &psDec->outBuf[ start_idx + k * psDec->subfr_length ],
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A_Q12, psDec->ltp_mem_length - start_idx, psDec->LPC_order );
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/* After rewhitening the LTP state is unscaled */
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if( k == 0 ) {
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/* Do LTP downscaling to reduce inter-packet dependency */
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inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, psDecCtrl->LTP_scale_Q14 ), 2 );
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}
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for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
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sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWB( inv_gain_Q31, sLTP[ psDec->ltp_mem_length - i - 1 ] );
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}
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} else {
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/* Update LTP state when Gain changes */
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if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
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for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
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sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ sLTP_buf_idx - i - 1 ] );
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}
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}
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}
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}
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/* Long-term prediction */
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if( signalType == TYPE_VOICED ) {
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/* Set up pointer */
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pred_lag_ptr = &sLTP_Q15[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
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for( i = 0; i < psDec->subfr_length; i++ ) {
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/* Unrolled loop */
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/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
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LTP_pred_Q13 = 2;
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LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ 0 ], B_Q14[ 0 ] );
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LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
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LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
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LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
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LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
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pred_lag_ptr++;
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/* Generate LPC excitation */
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pres_Q14[ i ] = silk_ADD_LSHIFT32( pexc_Q14[ i ], LTP_pred_Q13, 1 );
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/* Update states */
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sLTP_Q15[ sLTP_buf_idx ] = silk_LSHIFT( pres_Q14[ i ], 1 );
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sLTP_buf_idx++;
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}
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} else {
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pres_Q14 = pexc_Q14;
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}
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for( i = 0; i < psDec->subfr_length; i++ ) {
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/* Short-term prediction */
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silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
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/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
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LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 1 ], A_Q12_tmp[ 0 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 2 ], A_Q12_tmp[ 1 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 3 ], A_Q12_tmp[ 2 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 4 ], A_Q12_tmp[ 3 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 5 ], A_Q12_tmp[ 4 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 6 ], A_Q12_tmp[ 5 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 7 ], A_Q12_tmp[ 6 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 8 ], A_Q12_tmp[ 7 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 9 ], A_Q12_tmp[ 8 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] );
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if( psDec->LPC_order == 16 ) {
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 11 ], A_Q12_tmp[ 10 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 12 ], A_Q12_tmp[ 11 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 13 ], A_Q12_tmp[ 12 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 14 ], A_Q12_tmp[ 13 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 15 ], A_Q12_tmp[ 14 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 16 ], A_Q12_tmp[ 15 ] );
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}
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/* Add prediction to LPC excitation */
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sLPC_Q14[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT32( pres_Q14[ i ], LPC_pred_Q10, 4 );
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/* Scale with gain */
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pxq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14[ MAX_LPC_ORDER + i ], Gain_Q10 ), 8 ) );
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}
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/* DEBUG_STORE_DATA( dec.pcm, pxq, psDec->subfr_length * sizeof( opus_int16 ) ) */
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/* Update LPC filter state */
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silk_memcpy( sLPC_Q14, &sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
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pexc_Q14 += psDec->subfr_length;
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pxq += psDec->subfr_length;
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}
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/* Save LPC state */
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silk_memcpy( psDec->sLPC_Q14_buf, sLPC_Q14, MAX_LPC_ORDER * sizeof( opus_int32 ) );
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RESTORE_STACK;
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}
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