Updating Opus to a pre-release of 1.1

silk/LPC_analysis_filter.c

 /***********************************************************************
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+- Neither the name of Internet Society, IETF or IETF Trust, nor the
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-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #include "SigProc_FIX.h"
+#include "celt_lpc.h"
 
 /*******************************************/
 /* LPC analysis filter                     */
 /* NB! State is kept internally and the    */
 /* filter always starts with zero state    */
 /* first d output samples are set to zero  */
 /*******************************************/
 
 void silk_LPC_analysis_filter(
     opus_int16                  *out,               /* O    Output signal                                               */
     const opus_int16            *in,                /* I    Input signal                                                */
     const opus_int16            *B,                 /* I    MA prediction coefficients, Q12 [order]                     */
     const opus_int32            len,                /* I    Signal length                                               */
     const opus_int32            d                   /* I    Filter order                                                */
 )
 {
-    opus_int         ix, j;
+    opus_int   j;
+#ifdef FIXED_POINT
+    opus_int16 mem[SILK_MAX_ORDER_LPC];
+    opus_int16 num[SILK_MAX_ORDER_LPC];
+#else
+    int ix;
     opus_int32       out32_Q12, out32;
     const opus_int16 *in_ptr;
+#endif
 
     silk_assert( d >= 6 );
     silk_assert( (d & 1) == 0 );
     silk_assert( d <= len );
 
+#ifdef FIXED_POINT
+    silk_assert( d <= SILK_MAX_ORDER_LPC );
+    for ( j = 0; j < d; j++ ) {
+        num[ j ] = -B[ j ];
+    }
+    for (j=0;j<d;j++) {
+        mem[ j ] = in[ d - j - 1 ];
+    }
+    celt_fir( in + d, num, out + d, len - d, d, mem );
+    for ( j = 0; j < d; j++ ) {
+        out[ j ] = 0;
+    }
+#else
     for( ix = d; ix < len; ix++ ) {
         in_ptr = &in[ ix - 1 ];
 
         out32_Q12 = silk_SMULBB( in_ptr[  0 ], B[ 0 ] );
         /* Allowing wrap around so that two wraps can cancel each other. The rare
            cases where the result wraps around can only be triggered by invalid streams*/
         out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -1 ], B[ 1 ] );
         out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -2 ], B[ 2 ] );
         out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -3 ], B[ 3 ] );
         out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -4 ], B[ 4 ] );
         out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -5 ], B[ 5 ] );
         for( j = 6; j < d; j += 2 ) {
             out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j     ], B[ j     ] );
             out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j - 1 ], B[ j + 1 ] );
         }
 
         /* Subtract prediction */
         out32_Q12 = silk_SUB32_ovflw( silk_LSHIFT( (opus_int32)in_ptr[ 1 ], 12 ), out32_Q12 );
 
         /* Scale to Q0 */
         out32 = silk_RSHIFT_ROUND( out32_Q12, 12 );
 
         /* Saturate output */
         out[ ix ] = (opus_int16)silk_SAT16( out32 );
     }
 
     /* Set first d output samples to zero */
     silk_memset( out, 0, d * sizeof( opus_int16 ) );
+#endif
 }