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Unified Diff: third_party/opus/src/silk/fixed/find_LTP_FIX.c

Issue 2962373002: [Opus] Update to v1.2.1 (Closed)
Patch Set: Pre-increment instead of post-increment Created 3 years, 5 months ago
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Index: third_party/opus/src/silk/fixed/find_LTP_FIX.c
diff --git a/third_party/opus/src/silk/fixed/find_LTP_FIX.c b/third_party/opus/src/silk/fixed/find_LTP_FIX.c
index 1314a281375bd69c7270ca25fdd91e88e38c0c76..62d4afb2507407267112ec43946aceeeedb25c23 100644
--- a/third_party/opus/src/silk/fixed/find_LTP_FIX.c
+++ b/third_party/opus/src/silk/fixed/find_LTP_FIX.c
@@ -32,214 +32,68 @@ POSSIBILITY OF SUCH DAMAGE.
#include "main_FIX.h"
#include "tuning_parameters.h"
-/* Head room for correlations */
-#define LTP_CORRS_HEAD_ROOM 2
-
-void silk_fit_LTP(
- opus_int32 LTP_coefs_Q16[ LTP_ORDER ],
- opus_int16 LTP_coefs_Q14[ LTP_ORDER ]
-);
-
void silk_find_LTP_FIX(
- opus_int16 b_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */
- opus_int32 WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
- opus_int *LTPredCodGain_Q7, /* O LTP coding gain */
- const opus_int16 r_lpc[], /* I residual signal after LPC signal + state for first 10 ms */
+ opus_int32 XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Correlation matrix */
+ opus_int32 xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ], /* O Correlation vector */
+ const opus_int16 r_ptr[], /* I Residual signal after LPC */
const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
- const opus_int32 Wght_Q15[ MAX_NB_SUBFR ], /* I weights */
- const opus_int subfr_length, /* I subframe length */
- const opus_int nb_subfr, /* I number of subframes */
- const opus_int mem_offset, /* I number of samples in LTP memory */
- opus_int corr_rshifts[ MAX_NB_SUBFR ], /* O right shifts applied to correlations */
+ const opus_int subfr_length, /* I Subframe length */
+ const opus_int nb_subfr, /* I Number of subframes */
int arch /* I Run-time architecture */
)
{
- opus_int i, k, lshift;
- const opus_int16 *r_ptr, *lag_ptr;
- opus_int16 *b_Q14_ptr;
-
- opus_int32 regu;
- opus_int32 *WLTP_ptr;
- opus_int32 b_Q16[ LTP_ORDER ], delta_b_Q14[ LTP_ORDER ], d_Q14[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], g_Q26;
- opus_int32 w[ MAX_NB_SUBFR ], WLTP_max, max_abs_d_Q14, max_w_bits;
-
- opus_int32 temp32, denom32;
- opus_int extra_shifts;
- opus_int rr_shifts, maxRshifts, maxRshifts_wxtra, LZs;
- opus_int32 LPC_res_nrg, LPC_LTP_res_nrg, div_Q16;
- opus_int32 Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ];
- opus_int32 wd, m_Q12;
-
- b_Q14_ptr = b_Q14;
- WLTP_ptr = WLTP;
- r_ptr = &r_lpc[ mem_offset ];
+ opus_int i, k, extra_shifts;
+ opus_int xx_shifts, xX_shifts, XX_shifts;
+ const opus_int16 *lag_ptr;
+ opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr;
+ opus_int32 xx, nrg, temp;
+
+ xXLTP_Q17_ptr = xXLTP_Q17;
+ XXLTP_Q17_ptr = XXLTP_Q17;
for( k = 0; k < nb_subfr; k++ ) {
lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
- silk_sum_sqr_shift( &rr[ k ], &rr_shifts, r_ptr, subfr_length ); /* rr[ k ] in Q( -rr_shifts ) */
-
- /* Assure headroom */
- LZs = silk_CLZ32( rr[k] );
- if( LZs < LTP_CORRS_HEAD_ROOM ) {
- rr[ k ] = silk_RSHIFT_ROUND( rr[ k ], LTP_CORRS_HEAD_ROOM - LZs );
- rr_shifts += ( LTP_CORRS_HEAD_ROOM - LZs );
- }
- corr_rshifts[ k ] = rr_shifts;
- silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, LTP_CORRS_HEAD_ROOM, WLTP_ptr, &corr_rshifts[ k ], arch ); /* WLTP_fix_ptr in Q( -corr_rshifts[ k ] ) */
-
- /* The correlation vector always has lower max abs value than rr and/or RR so head room is assured */
- silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr, corr_rshifts[ k ], arch ); /* Rr_fix_ptr in Q( -corr_rshifts[ k ] ) */
- if( corr_rshifts[ k ] > rr_shifts ) {
- rr[ k ] = silk_RSHIFT( rr[ k ], corr_rshifts[ k ] - rr_shifts ); /* rr[ k ] in Q( -corr_rshifts[ k ] ) */
+ silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER ); /* xx in Q( -xx_shifts ) */
+ silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, XXLTP_Q17_ptr, &nrg, &XX_shifts, arch ); /* XXLTP_Q17_ptr and nrg in Q( -XX_shifts ) */
+ extra_shifts = xx_shifts - XX_shifts;
+ if( extra_shifts > 0 ) {
+ /* Shift XX */
+ xX_shifts = xx_shifts;
+ for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
+ XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts ); /* Q( -xX_shifts ) */
+ }
+ nrg = silk_RSHIFT32( nrg, extra_shifts ); /* Q( -xX_shifts ) */
+ } else if( extra_shifts < 0 ) {
+ /* Shift xx */
+ xX_shifts = XX_shifts;
+ xx = silk_RSHIFT32( xx, -extra_shifts ); /* Q( -xX_shifts ) */
+ } else {
+ xX_shifts = xx_shifts;
}
- silk_assert( rr[ k ] >= 0 );
-
- regu = 1;
- regu = silk_SMLAWB( regu, rr[ k ], SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
- regu = silk_SMLAWB( regu, matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ), SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
- regu = silk_SMLAWB( regu, matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER ), SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
- silk_regularize_correlations_FIX( WLTP_ptr, &rr[k], regu, LTP_ORDER );
-
- silk_solve_LDL_FIX( WLTP_ptr, LTP_ORDER, Rr, b_Q16 ); /* WLTP_fix_ptr and Rr_fix_ptr both in Q(-corr_rshifts[k]) */
-
- /* Limit and store in Q14 */
- silk_fit_LTP( b_Q16, b_Q14_ptr );
-
- /* Calculate residual energy */
- nrg[ k ] = silk_residual_energy16_covar_FIX( b_Q14_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER, 14 ); /* nrg_fix in Q( -corr_rshifts[ k ] ) */
-
- /* temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length ); */
- extra_shifts = silk_min_int( corr_rshifts[ k ], LTP_CORRS_HEAD_ROOM );
- denom32 = silk_LSHIFT_SAT32( silk_SMULWB( nrg[ k ], Wght_Q15[ k ] ), 1 + extra_shifts ) + /* Q( -corr_rshifts[ k ] + extra_shifts ) */
- silk_RSHIFT( silk_SMULWB( (opus_int32)subfr_length, 655 ), corr_rshifts[ k ] - extra_shifts ); /* Q( -corr_rshifts[ k ] + extra_shifts ) */
- denom32 = silk_max( denom32, 1 );
- silk_assert( ((opus_int64)Wght_Q15[ k ] << 16 ) < silk_int32_MAX ); /* Wght always < 0.5 in Q0 */
- temp32 = silk_DIV32( silk_LSHIFT( (opus_int32)Wght_Q15[ k ], 16 ), denom32 ); /* Q( 15 + 16 + corr_rshifts[k] - extra_shifts ) */
- temp32 = silk_RSHIFT( temp32, 31 + corr_rshifts[ k ] - extra_shifts - 26 ); /* Q26 */
+ silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch ); /* xXLTP_Q17_ptr in Q( -xX_shifts ) */
- /* Limit temp such that the below scaling never wraps around */
- WLTP_max = 0;
+ /* At this point all correlations are in Q(-xX_shifts) */
+ temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) );
+ temp = silk_max( temp, xx );
+TIC(div)
+#if 0
for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
- WLTP_max = silk_max( WLTP_ptr[ i ], WLTP_max );
+ XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 );
}
- lshift = silk_CLZ32( WLTP_max ) - 1 - 3; /* keep 3 bits free for vq_nearest_neighbor_fix */
- silk_assert( 26 - 18 + lshift >= 0 );
- if( 26 - 18 + lshift < 31 ) {
- temp32 = silk_min_32( temp32, silk_LSHIFT( (opus_int32)1, 26 - 18 + lshift ) );
- }
-
- silk_scale_vector32_Q26_lshift_18( WLTP_ptr, temp32, LTP_ORDER * LTP_ORDER ); /* WLTP_ptr in Q( 18 - corr_rshifts[ k ] ) */
-
- w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER/2, LTP_ORDER/2, LTP_ORDER ); /* w in Q( 18 - corr_rshifts[ k ] ) */
- silk_assert( w[k] >= 0 );
-
- r_ptr += subfr_length;
- b_Q14_ptr += LTP_ORDER;
- WLTP_ptr += LTP_ORDER * LTP_ORDER;
- }
-
- maxRshifts = 0;
- for( k = 0; k < nb_subfr; k++ ) {
- maxRshifts = silk_max_int( corr_rshifts[ k ], maxRshifts );
- }
-
- /* Compute LTP coding gain */
- if( LTPredCodGain_Q7 != NULL ) {
- LPC_LTP_res_nrg = 0;
- LPC_res_nrg = 0;
- silk_assert( LTP_CORRS_HEAD_ROOM >= 2 ); /* Check that no overflow will happen when adding */
- for( k = 0; k < nb_subfr; k++ ) {
- LPC_res_nrg = silk_ADD32( LPC_res_nrg, silk_RSHIFT( silk_ADD32( silk_SMULWB( rr[ k ], Wght_Q15[ k ] ), 1 ), 1 + ( maxRshifts - corr_rshifts[ k ] ) ) ); /* Q( -maxRshifts ) */
- LPC_LTP_res_nrg = silk_ADD32( LPC_LTP_res_nrg, silk_RSHIFT( silk_ADD32( silk_SMULWB( nrg[ k ], Wght_Q15[ k ] ), 1 ), 1 + ( maxRshifts - corr_rshifts[ k ] ) ) ); /* Q( -maxRshifts ) */
- }
- LPC_LTP_res_nrg = silk_max( LPC_LTP_res_nrg, 1 ); /* avoid division by zero */
-
- div_Q16 = silk_DIV32_varQ( LPC_res_nrg, LPC_LTP_res_nrg, 16 );
- *LTPredCodGain_Q7 = ( opus_int )silk_SMULBB( 3, silk_lin2log( div_Q16 ) - ( 16 << 7 ) );
-
- silk_assert( *LTPredCodGain_Q7 == ( opus_int )silk_SAT16( silk_MUL( 3, silk_lin2log( div_Q16 ) - ( 16 << 7 ) ) ) );
- }
-
- /* smoothing */
- /* d = sum( B, 1 ); */
- b_Q14_ptr = b_Q14;
- for( k = 0; k < nb_subfr; k++ ) {
- d_Q14[ k ] = 0;
for( i = 0; i < LTP_ORDER; i++ ) {
- d_Q14[ k ] += b_Q14_ptr[ i ];
- }
- b_Q14_ptr += LTP_ORDER;
- }
-
- /* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */
-
- /* Find maximum absolute value of d_Q14 and the bits used by w in Q0 */
- max_abs_d_Q14 = 0;
- max_w_bits = 0;
- for( k = 0; k < nb_subfr; k++ ) {
- max_abs_d_Q14 = silk_max_32( max_abs_d_Q14, silk_abs( d_Q14[ k ] ) );
- /* w[ k ] is in Q( 18 - corr_rshifts[ k ] ) */
- /* Find bits needed in Q( 18 - maxRshifts ) */
- max_w_bits = silk_max_32( max_w_bits, 32 - silk_CLZ32( w[ k ] ) + corr_rshifts[ k ] - maxRshifts );
- }
-
- /* max_abs_d_Q14 = (5 << 15); worst case, i.e. LTP_ORDER * -silk_int16_MIN */
- silk_assert( max_abs_d_Q14 <= ( 5 << 15 ) );
-
- /* How many bits is needed for w*d' in Q( 18 - maxRshifts ) in the worst case, of all d_Q14's being equal to max_abs_d_Q14 */
- extra_shifts = max_w_bits + 32 - silk_CLZ32( max_abs_d_Q14 ) - 14;
-
- /* Subtract what we got available; bits in output var plus maxRshifts */
- extra_shifts -= ( 32 - 1 - 2 + maxRshifts ); /* Keep sign bit free as well as 2 bits for accumulation */
- extra_shifts = silk_max_int( extra_shifts, 0 );
-
- maxRshifts_wxtra = maxRshifts + extra_shifts;
-
- temp32 = silk_RSHIFT( 262, maxRshifts + extra_shifts ) + 1; /* 1e-3f in Q( 18 - (maxRshifts + extra_shifts) ) */
- wd = 0;
- for( k = 0; k < nb_subfr; k++ ) {
- /* w has at least 2 bits of headroom so no overflow should happen */
- temp32 = silk_ADD32( temp32, silk_RSHIFT( w[ k ], maxRshifts_wxtra - corr_rshifts[ k ] ) ); /* Q( 18 - maxRshifts_wxtra ) */
- wd = silk_ADD32( wd, silk_LSHIFT( silk_SMULWW( silk_RSHIFT( w[ k ], maxRshifts_wxtra - corr_rshifts[ k ] ), d_Q14[ k ] ), 2 ) ); /* Q( 18 - maxRshifts_wxtra ) */
- }
- m_Q12 = silk_DIV32_varQ( wd, temp32, 12 );
-
- b_Q14_ptr = b_Q14;
- for( k = 0; k < nb_subfr; k++ ) {
- /* w_fix[ k ] from Q( 18 - corr_rshifts[ k ] ) to Q( 16 ) */
- if( 2 - corr_rshifts[k] > 0 ) {
- temp32 = silk_RSHIFT( w[ k ], 2 - corr_rshifts[ k ] );
- } else {
- temp32 = silk_LSHIFT_SAT32( w[ k ], corr_rshifts[ k ] - 2 );
+ xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 );
}
-
- g_Q26 = silk_MUL(
- silk_DIV32(
- SILK_FIX_CONST( LTP_SMOOTHING, 26 ),
- silk_RSHIFT( SILK_FIX_CONST( LTP_SMOOTHING, 26 ), 10 ) + temp32 ), /* Q10 */
- silk_LSHIFT_SAT32( silk_SUB_SAT32( (opus_int32)m_Q12, silk_RSHIFT( d_Q14[ k ], 2 ) ), 4 ) ); /* Q16 */
-
- temp32 = 0;
- for( i = 0; i < LTP_ORDER; i++ ) {
- delta_b_Q14[ i ] = silk_max_16( b_Q14_ptr[ i ], 1638 ); /* 1638_Q14 = 0.1_Q0 */
- temp32 += delta_b_Q14[ i ]; /* Q14 */
+#else
+ for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
+ XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp );
}
- temp32 = silk_DIV32( g_Q26, temp32 ); /* Q14 -> Q12 */
for( i = 0; i < LTP_ORDER; i++ ) {
- b_Q14_ptr[ i ] = silk_LIMIT_32( (opus_int32)b_Q14_ptr[ i ] + silk_SMULWB( silk_LSHIFT_SAT32( temp32, 4 ), delta_b_Q14[ i ] ), -16000, 28000 );
+ xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp );
}
- b_Q14_ptr += LTP_ORDER;
- }
-}
-
-void silk_fit_LTP(
- opus_int32 LTP_coefs_Q16[ LTP_ORDER ],
- opus_int16 LTP_coefs_Q14[ LTP_ORDER ]
-)
-{
- opus_int i;
-
- for( i = 0; i < LTP_ORDER; i++ ) {
- LTP_coefs_Q14[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( LTP_coefs_Q16[ i ], 2 ) );
+#endif
+TOC(div)
+ r_ptr += subfr_length;
+ XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER;
+ xXLTP_Q17_ptr += LTP_ORDER;
}
}
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