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27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main_FIX.h"
33
34 #define QC 10
35 #define QS 14
36
37 #if defined(MIPSr1_ASM)
38 #include "mips/warped_autocorrelation_FIX_mipsr1.h"
39 #endif
40
41
42 #ifndef OVERRIDE_silk_warped_autocorrelation_FIX
43 /* Autocorrelations for a warped frequency axis */
silk_warped_autocorrelation_FIX(opus_int32 * corr,opus_int * scale,const opus_int16 * input,const opus_int warping_Q16,const opus_int length,const opus_int order)44 void silk_warped_autocorrelation_FIX(
45 opus_int32 *corr, /* O Result [order + 1] */
46 opus_int *scale, /* O Scaling of the correlation vector */
47 const opus_int16 *input, /* I Input data to correlate */
48 const opus_int warping_Q16, /* I Warping coefficient */
49 const opus_int length, /* I Length of input */
50 const opus_int order /* I Correlation order (even) */
51 )
52 {
53 opus_int n, i, lsh;
54 opus_int32 tmp1_QS, tmp2_QS;
55 opus_int32 state_QS[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
56 opus_int64 corr_QC[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
57
58 /* Order must be even */
59 silk_assert( ( order & 1 ) == 0 );
60 silk_assert( 2 * QS - QC >= 0 );
61
62 /* Loop over samples */
63 for( n = 0; n < length; n++ ) {
64 tmp1_QS = silk_LSHIFT32( (opus_int32)input[ n ], QS );
65 /* Loop over allpass sections */
66 for( i = 0; i < order; i += 2 ) {
67 /* Output of allpass section */
68 tmp2_QS = silk_SMLAWB( state_QS[ i ], state_QS[ i + 1 ] - tmp1_QS, warping_Q16 );
69 state_QS[ i ] = tmp1_QS;
70 corr_QC[ i ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
71 /* Output of allpass section */
72 tmp1_QS = silk_SMLAWB( state_QS[ i + 1 ], state_QS[ i + 2 ] - tmp2_QS, warping_Q16 );
73 state_QS[ i + 1 ] = tmp2_QS;
74 corr_QC[ i + 1 ] += silk_RSHIFT64( silk_SMULL( tmp2_QS, state_QS[ 0 ] ), 2 * QS - QC );
75 }
76 state_QS[ order ] = tmp1_QS;
77 corr_QC[ order ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
78 }
79
80 lsh = silk_CLZ64( corr_QC[ 0 ] ) - 35;
81 lsh = silk_LIMIT( lsh, -12 - QC, 30 - QC );
82 *scale = -( QC + lsh );
83 silk_assert( *scale >= -30 && *scale <= 12 );
84 if( lsh >= 0 ) {
85 for( i = 0; i < order + 1; i++ ) {
86 corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_LSHIFT64( corr_QC[ i ], lsh ) );
87 }
88 } else {
89 for( i = 0; i < order + 1; i++ ) {
90 corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( corr_QC[ i ], -lsh ) );
91 }
92 }
93 silk_assert( corr_QC[ 0 ] >= 0 ); /* If breaking, decrease QC*/
94 }
95 #endif /* OVERRIDE_silk_warped_autocorrelation_FIX */
96