diff options
Diffstat (limited to 'thirdparty/opus/silk/NLSF_decode.c')
| -rw-r--r-- | thirdparty/opus/silk/NLSF_decode.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/thirdparty/opus/silk/NLSF_decode.c b/thirdparty/opus/silk/NLSF_decode.c index eeb0ba8c92..9f715060b8 100644 --- a/thirdparty/opus/silk/NLSF_decode.c +++ b/thirdparty/opus/silk/NLSF_decode.c @@ -32,7 +32,7 @@ POSSIBILITY OF SUCH DAMAGE. #include "main.h" /* Predictive dequantizer for NLSF residuals */ -static OPUS_INLINE void silk_NLSF_residual_dequant( /* O Returns RD value in Q30 */ +static OPUS_INLINE void silk_NLSF_residual_dequant( /* O Returns RD value in Q30 */ opus_int16 x_Q10[], /* O Output [ order ] */ const opus_int8 indices[], /* I Quantization indices [ order ] */ const opus_uint8 pred_coef_Q8[], /* I Backward predictor coefs [ order ] */ @@ -70,9 +70,15 @@ void silk_NLSF_decode( opus_uint8 pred_Q8[ MAX_LPC_ORDER ]; opus_int16 ec_ix[ MAX_LPC_ORDER ]; opus_int16 res_Q10[ MAX_LPC_ORDER ]; - opus_int32 NLSF_Q15_tmp; + opus_int16 W_tmp_QW[ MAX_LPC_ORDER ]; + opus_int32 W_tmp_Q9, NLSF_Q15_tmp; const opus_uint8 *pCB_element; - const opus_int16 *pCB_Wght_Q9; + + /* 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 ] = silk_LSHIFT( (opus_int16)pCB_element[ i ], 7 ); + } /* Unpack entropy table indices and predictor for current CB1 index */ silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] ); @@ -80,11 +86,13 @@ void silk_NLSF_decode( /* Predictive residual dequantizer */ silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order ); - /* Apply inverse square-rooted weights to first stage and add to output */ - pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ]; - pCB_Wght_Q9 = &psNLSF_CB->CB1_Wght_Q9[ NLSFIndices[ 0 ] * psNLSF_CB->order ]; + /* Weights from codebook vector */ + silk_NLSF_VQ_weights_laroia( W_tmp_QW, pNLSF_Q15, psNLSF_CB->order ); + + /* Apply inverse square-rooted weights and add to output */ for( i = 0; i < psNLSF_CB->order; i++ ) { - NLSF_Q15_tmp = silk_ADD_LSHIFT32( silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), pCB_Wght_Q9[ i ] ), (opus_int16)pCB_element[ i ], 7 ); + W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) ); + NLSF_Q15_tmp = silk_ADD32( pNLSF_Q15[ i ], silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), W_tmp_Q9 ) ); pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 ); } |