Add copy of opus library in deps/third_party.

opus/silk/sort.c

+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the 
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* Insertion sort (fast for already almost sorted arrays):   */
+/* Best case:  O(n)   for an already sorted array            */
+/* Worst case: O(n^2) for an inversely sorted array          */
+/*                                                           */
+/* Shell short:    http://en.wikipedia.org/wiki/Shell_sort   */
+
+#include "SigProc_FIX.h"
+
+void silk_insertion_sort_increasing(
+    opus_int32           *a,             /* I/O   Unsorted / Sorted vector               */
+    opus_int             *idx,           /* O     Index vector for the sorted elements   */
+    const opus_int       L,              /* I     Vector length                          */
+    const opus_int       K               /* I     Number of correctly sorted positions   */
+)
+{
+    opus_int32    value;
+    opus_int        i, j;
+
+    /* Safety checks */
+    silk_assert( K >  0 );
+    silk_assert( L >  0 );
+    silk_assert( L >= K );
+
+    /* Write start indices in index vector */
+    for( i = 0; i < K; i++ ) {
+        idx[ i ] = i;
+    }
+
+    /* Sort vector elements by value, increasing order */
+    for( i = 1; i < K; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+            a[ j + 1 ]   = a[ j ];       /* Shift value */
+            idx[ j + 1 ] = idx[ j ];     /* Shift index */
+        }
+        a[ j + 1 ]   = value;   /* Write value */
+        idx[ j + 1 ] = i;       /* Write index */
+    }
+
+    /* If less than L values are asked for, check the remaining values, */
+    /* but only spend CPU to ensure that the K first values are correct */
+    for( i = K; i < L; i++ ) {
+        value = a[ i ];
+        if( value < a[ K - 1 ] ) {
+            for( j = K - 2; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+                a[ j + 1 ]   = a[ j ];       /* Shift value */
+                idx[ j + 1 ] = idx[ j ];     /* Shift index */
+            }
+            a[ j + 1 ]   = value;   /* Write value */
+            idx[ j + 1 ] = i;       /* Write index */
+        }
+    }
+}
+
+#ifdef FIXED_POINT
+/* This function is only used by the fixed-point build */
+void silk_insertion_sort_decreasing_int16(
+    opus_int16                  *a,                 /* I/O   Unsorted / Sorted vector                                   */
+    opus_int                    *idx,               /* O     Index vector for the sorted elements                       */
+    const opus_int              L,                  /* I     Vector length                                              */
+    const opus_int              K                   /* I     Number of correctly sorted positions                       */
+)
+{
+    opus_int i, j;
+    opus_int value;
+
+    /* Safety checks */
+    silk_assert( K >  0 );
+    silk_assert( L >  0 );
+    silk_assert( L >= K );
+
+    /* Write start indices in index vector */
+    for( i = 0; i < K; i++ ) {
+        idx[ i ] = i;
+    }
+
+    /* Sort vector elements by value, decreasing order */
+    for( i = 1; i < K; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+            a[ j + 1 ]   = a[ j ];     /* Shift value */
+            idx[ j + 1 ] = idx[ j ];   /* Shift index */
+        }
+        a[ j + 1 ]   = value;   /* Write value */
+        idx[ j + 1 ] = i;       /* Write index */
+    }
+
+    /* If less than L values are asked for, check the remaining values, */
+    /* but only spend CPU to ensure that the K first values are correct */
+    for( i = K; i < L; i++ ) {
+        value = a[ i ];
+        if( value > a[ K - 1 ] ) {
+            for( j = K - 2; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+                a[ j + 1 ]   = a[ j ];     /* Shift value */
+                idx[ j + 1 ] = idx[ j ];   /* Shift index */
+            }
+            a[ j + 1 ]   = value;   /* Write value */
+            idx[ j + 1 ] = i;       /* Write index */
+        }
+    }
+}
+#endif
+
+void silk_insertion_sort_increasing_all_values_int16(
+     opus_int16                 *a,                 /* I/O   Unsorted / Sorted vector                                   */
+     const opus_int             L                   /* I     Vector length                                              */
+)
+{
+    opus_int    value;
+    opus_int    i, j;
+
+    /* Safety checks */
+    silk_assert( L >  0 );
+
+    /* Sort vector elements by value, increasing order */
+    for( i = 1; i < L; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+            a[ j + 1 ] = a[ j ]; /* Shift value */
+        }
+        a[ j + 1 ] = value; /* Write value */
+    }
+}