diff options
Diffstat (limited to 'thirdparty/opus/silk/NLSF_VQ.c')
| -rw-r--r-- | thirdparty/opus/silk/NLSF_VQ.c | 44 |
1 files changed, 18 insertions, 26 deletions
diff --git a/thirdparty/opus/silk/NLSF_VQ.c b/thirdparty/opus/silk/NLSF_VQ.c index b83182a79c..69b6e22e18 100644 --- a/thirdparty/opus/silk/NLSF_VQ.c +++ b/thirdparty/opus/silk/NLSF_VQ.c @@ -33,44 +33,36 @@ POSSIBILITY OF SUCH DAMAGE. /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */ void silk_NLSF_VQ( - opus_int32 err_Q24[], /* O Quantization errors [K] */ + opus_int32 err_Q26[], /* O Quantization errors [K] */ const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */ const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */ - const opus_int16 pWght_Q9[], /* I Codebook weights [K*LPC_order] */ const opus_int K, /* I Number of codebook vectors */ const opus_int LPC_order /* I Number of LPCs */ ) { - opus_int i, m; - opus_int32 diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24; - const opus_int16 *w_Q9_ptr; - const opus_uint8 *cb_Q8_ptr; + opus_int i, m; + opus_int32 diff_Q15, sum_error_Q30, sum_error_Q26; - celt_assert( ( LPC_order & 1 ) == 0 ); + silk_assert( LPC_order <= 16 ); + silk_assert( ( LPC_order & 1 ) == 0 ); /* Loop over codebook */ - cb_Q8_ptr = pCB_Q8; - w_Q9_ptr = pWght_Q9; for( i = 0; i < K; i++ ) { - sum_error_Q24 = 0; - pred_Q24 = 0; - for( m = LPC_order-2; m >= 0; m -= 2 ) { - /* Compute weighted absolute predictive quantization error for index m + 1 */ - diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/ - diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] ); - sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) ); - pred_Q24 = diffw_Q24; + sum_error_Q26 = 0; + for( m = 0; m < LPC_order; m += 2 ) { + /* Compute weighted squared quantization error for index m */ + diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ + sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 ); - /* Compute weighted absolute predictive quantization error for index m */ - diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/ - diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] ); - sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) ); - pred_Q24 = diffw_Q24; + /* Compute weighted squared quantization error for index m + 1 */ + diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/ + sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 ); - silk_assert( sum_error_Q24 >= 0 ); + sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 ); + + silk_assert( sum_error_Q26 >= 0 ); + silk_assert( sum_error_Q30 >= 0 ); } - err_Q24[ i ] = sum_error_Q24; - cb_Q8_ptr += LPC_order; - w_Q9_ptr += LPC_order; + err_Q26[ i ] = sum_error_Q26; } } |