diff options
| author | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2011-04-28 16:24:29 -0400 |
|---|---|---|
| committer | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2011-04-28 16:24:29 -0400 |
| commit | 310af750eb5726b4143a43208f2bc03677c6f5db (patch) | |
| tree | 8c2a6134a16c32a0bd94e030a782d90d117808f4 /silk/SKP_Silk_decode_parameters.c | |
| parent | 011402a252450a6883f109a86e5dd7e24aa0d3a0 (diff) | |
| download | opus-310af750eb5726b4143a43208f2bc03677c6f5db.tar.gz | |
Moved all SILK source code to the silk/ directory
Diffstat (limited to 'silk/SKP_Silk_decode_parameters.c')
| m--------- | silk | 6 | ||||
| -rw-r--r-- | silk/SKP_Silk_decode_parameters.c | 111 |
2 files changed, 111 insertions, 6 deletions
diff --git a/silk b/silk deleted file mode 160000 -Subproject 8a8b76efeeccaccf402b0b2b4e469980d0a4831 diff --git a/silk/SKP_Silk_decode_parameters.c b/silk/SKP_Silk_decode_parameters.c new file mode 100644 index 00000000..5ec8145b --- /dev/null +++ b/silk/SKP_Silk_decode_parameters.c @@ -0,0 +1,111 @@ +/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+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
+contributors, may be used to endorse or promote products derived from
+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
+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.
+***********************************************************************/
+
+#include "SKP_Silk_main.h"
+
+/* Decode parameters from payload */
+void SKP_Silk_decode_parameters(
+ SKP_Silk_decoder_state *psDec, /* I/O State */
+ SKP_Silk_decoder_control *psDecCtrl /* I/O Decoder control */
+)
+{
+ SKP_int i, k, Ix;
+ SKP_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
+ const SKP_int8 *cbk_ptr_Q7;
+
+ /* Dequant Gains */
+ SKP_Silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
+ &psDec->LastGainIndex, psDec->nFramesDecoded, psDec->nb_subfr );
+
+ /****************/
+ /* Decode NLSFs */
+ /****************/
+ SKP_Silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
+
+ /* Convert NLSF parameters to AR prediction filter coefficients */
+ SKP_Silk_NLSF2A_stable( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
+
+ /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
+ /* improves the case of packet loss in the first frame after a switch */
+ if( psDec->first_frame_after_reset == 1 ) {
+ psDec->indices.NLSFInterpCoef_Q2 = 4;
+ }
+
+ if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
+ /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
+ /* the previous NLSF1, and the current NLSF1 */
+ for( i = 0; i < psDec->LPC_order; i++ ) {
+ pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + SKP_RSHIFT( SKP_MUL( psDec->indices.NLSFInterpCoef_Q2,
+ pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
+ }
+
+ /* Convert NLSF parameters to AR prediction filter coefficients */
+ SKP_Silk_NLSF2A_stable( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order );
+ } else {
+ /* Copy LPC coefficients for first half from second half */
+ SKP_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ],
+ psDec->LPC_order * sizeof( SKP_int16 ) );
+ }
+
+ SKP_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( SKP_int16 ) );
+
+ /* After a packet loss do BWE of LPC coefs */
+ if( psDec->lossCnt ) {
+ SKP_Silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+ SKP_Silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+ }
+
+ if( psDec->indices.signalType == TYPE_VOICED ) {
+ /*********************/
+ /* Decode pitch lags */
+ /*********************/
+
+ /* Decode pitch values */
+ SKP_Silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
+
+ /* Decode Codebook Index */
+ cbk_ptr_Q7 = SKP_Silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
+
+ for( k = 0; k < psDec->nb_subfr; k++ ) {
+ Ix = psDec->indices.LTPIndex[ k ];
+ for( i = 0; i < LTP_ORDER; i++ ) {
+ psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = SKP_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
+ }
+ }
+
+ /**********************/
+ /* Decode LTP scaling */
+ /**********************/
+ Ix = psDec->indices.LTP_scaleIndex;
+ psDecCtrl->LTP_scale_Q14 = SKP_Silk_LTPScales_table_Q14[ Ix ];
+ } else {
+ SKP_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( SKP_int ) );
+ SKP_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( SKP_int16 ) );
+ psDec->indices.PERIndex = 0;
+ psDecCtrl->LTP_scale_Q14 = 0;
+ }
+}
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