diff options
Diffstat (limited to 'silk/fixed/LTP_analysis_filter_FIX.c')
| -rw-r--r-- | silk/fixed/LTP_analysis_filter_FIX.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/silk/fixed/LTP_analysis_filter_FIX.c b/silk/fixed/LTP_analysis_filter_FIX.c index a9419080..5574e706 100644 --- a/silk/fixed/LTP_analysis_filter_FIX.c +++ b/silk/fixed/LTP_analysis_filter_FIX.c @@ -45,7 +45,7 @@ void silk_LTP_analysis_filter_FIX( const opus_int16 *x_ptr, *x_lag_ptr; opus_int16 Btmp_Q14[ LTP_ORDER ]; opus_int16 *LTP_res_ptr; - opus_int k, i, j; + opus_int k, i; opus_int32 LTP_est; x_ptr = x; @@ -53,9 +53,12 @@ void silk_LTP_analysis_filter_FIX( for( k = 0; k < nb_subfr; k++ ) { x_lag_ptr = x_ptr - pitchL[ k ]; - for( i = 0; i < LTP_ORDER; i++ ) { - Btmp_Q14[ i ] = LTPCoef_Q14[ k * LTP_ORDER + i ]; - } + + Btmp_Q14[ 0 ] = LTPCoef_Q14[ k * LTP_ORDER ]; + Btmp_Q14[ 1 ] = LTPCoef_Q14[ k * LTP_ORDER + 1 ]; + Btmp_Q14[ 2 ] = LTPCoef_Q14[ k * LTP_ORDER + 2 ]; + Btmp_Q14[ 3 ] = LTPCoef_Q14[ k * LTP_ORDER + 3 ]; + Btmp_Q14[ 4 ] = LTPCoef_Q14[ k * LTP_ORDER + 4 ]; /* LTP analysis FIR filter */ for( i = 0; i < subfr_length + pre_length; i++ ) { @@ -63,9 +66,11 @@ void silk_LTP_analysis_filter_FIX( /* Long-term prediction */ LTP_est = silk_SMULBB( x_lag_ptr[ LTP_ORDER / 2 ], Btmp_Q14[ 0 ] ); - for( j = 1; j < LTP_ORDER; j++ ) { - LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ LTP_ORDER / 2 - j ], Btmp_Q14[ j ] ); - } + LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ 1 ], Btmp_Q14[ 1 ] ); + LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ 0 ], Btmp_Q14[ 2 ] ); + LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ -1 ], Btmp_Q14[ 3 ] ); + LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ -2 ], Btmp_Q14[ 4 ] ); + LTP_est = silk_RSHIFT_ROUND( LTP_est, 14 ); /* round and -> Q0*/ /* Subtract long-term prediction */ |