diff options
Diffstat (limited to 'silk/SKP_Silk_NLSF_decode.c')
| m--------- | silk | 6 | ||||
| -rw-r--r-- | silk/SKP_Silk_NLSF_decode.c | 96 |
2 files changed, 96 insertions, 6 deletions
diff --git a/silk b/silk deleted file mode 160000 -Subproject 8a8b76efeeccaccf402b0b2b4e469980d0a4831 diff --git a/silk/SKP_Silk_NLSF_decode.c b/silk/SKP_Silk_NLSF_decode.c new file mode 100644 index 00000000..ec8017e9 --- /dev/null +++ b/silk/SKP_Silk_NLSF_decode.c @@ -0,0 +1,96 @@ +/***********************************************************************
+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"
+
+/* Predictive dequantizer for NLSF residuals */
+void SKP_Silk_NLSF_residual_dequant( /* O Returns RD value in Q30 */
+ SKP_int16 x_Q10[], /* O Output [ order ] */
+ const SKP_int8 indices[], /* I Quantization indices [ order ] */
+ const SKP_uint8 pred_coef_Q8[], /* I Backward predictor coefs [ order ] */
+ const SKP_int quant_step_size_Q16, /* I Quantization step size */
+ const SKP_int16 order /* I Number of input values */
+)
+{
+ SKP_int i, out_Q10, pred_Q10;
+
+ out_Q10 = 0;
+ for( i = order-1; i >= 0; i-- ) {
+ pred_Q10 = SKP_RSHIFT( SKP_SMULBB( out_Q10, (SKP_int16)pred_coef_Q8[ i ] ), 8 );
+ out_Q10 = SKP_LSHIFT( indices[ i ], 10 );
+ if( out_Q10 > 0 ) {
+ out_Q10 = SKP_SUB16( out_Q10, SKP_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+ } else if( out_Q10 < 0 ) {
+ out_Q10 = SKP_ADD16( out_Q10, SKP_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+ }
+ out_Q10 = SKP_SMLAWB( pred_Q10, out_Q10, quant_step_size_Q16 );
+ x_Q10[ i ] = out_Q10;
+ }
+}
+
+
+/***********************/
+/* NLSF vector decoder */
+/***********************/
+void SKP_Silk_NLSF_decode(
+ SKP_int16 *pNLSF_Q15, /* O Quantized NLSF vector [ LPC_ORDER ] */
+ SKP_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
+ const SKP_Silk_NLSF_CB_struct *psNLSF_CB /* I Codebook object */
+)
+{
+ SKP_int i;
+ SKP_uint8 pred_Q8[ MAX_LPC_ORDER ];
+ SKP_int16 ec_ix[ MAX_LPC_ORDER ];
+ SKP_int16 res_Q10[ MAX_LPC_ORDER ];
+ SKP_int16 W_tmp_Q5[ MAX_LPC_ORDER ];
+ SKP_int32 W_tmp_Q9;
+ const SKP_uint8 *pCB_element;
+
+ /* Decode first stage */
+ pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
+ for( i = 0; i < psNLSF_CB->order; i++ ) {
+ pNLSF_Q15[ i ] = SKP_LSHIFT( ( SKP_int16 )pCB_element[ i ], 7 );
+ }
+
+ /* Unpack entropy table indices and predictor for current CB1 index */
+ SKP_Silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] );
+
+ /* Trellis dequantizer */
+ SKP_Silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );
+
+ /* Weights from codebook vector */
+ SKP_Silk_NLSF_VQ_weights_laroia( W_tmp_Q5, pNLSF_Q15, psNLSF_CB->order );
+
+ /* Apply inverse square-rooted weights and add to output */
+ for( i = 0; i < psNLSF_CB->order; i++ ) {
+ W_tmp_Q9 = SKP_Silk_SQRT_APPROX( SKP_LSHIFT( ( SKP_int32 )W_tmp_Q5[ i ], 13 ) );
+ pNLSF_Q15[ i ] = SKP_ADD16( pNLSF_Q15[ i ], (SKP_int16)SKP_DIV32_16( SKP_LSHIFT( ( SKP_int32 )res_Q10[ i ], 14 ), W_tmp_Q9 ) );
+ }
+
+ /* NLSF stabilization */
+ SKP_Silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
+}
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