995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
239 lines
12 KiB
C
239 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_int16 pulses[ MAX_FRAME_LENGTH ], /* I Pulse signal */
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int arch /* I Run-time architecture */
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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, arch );
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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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