Add copy of opus library in deps/third_party.

opus/silk/fixed/residual_energy_FIX.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
+
+#include "main_FIX.h"
+
+/* Calculates residual energies of input subframes where all subframes have LPC_order   */
+/* of preceeding samples                                                                */
+void silk_residual_energy_FIX(
+          opus_int32                nrgs[ MAX_NB_SUBFR ],                   /* O    Residual energy per subframe                                                */
+          opus_int                  nrgsQ[ MAX_NB_SUBFR ],                  /* O    Q value per subframe                                                        */
+    const opus_int16                x[],                                    /* I    Input signal                                                                */
+          opus_int16                a_Q12[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                                                */
+    const opus_int32                gains[ MAX_NB_SUBFR ],                  /* I    Quantization gains                                                          */
+    const opus_int                  subfr_length,                           /* I    Subframe length                                                             */
+    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
+    const opus_int                  LPC_order                               /* I    LPC order                                                                   */
+)
+{
+    opus_int         offset, i, j, rshift, lz1, lz2;
+    opus_int16       *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ];
+    const opus_int16 *x_ptr;
+    opus_int32       tmp32;
+
+    x_ptr  = x;
+    offset = LPC_order + subfr_length;
+
+    /* Filter input to create the LPC residual for each frame half, and measure subframe energies */
+    for( i = 0; i < nb_subfr >> 1; i++ ) {
+        /* Calculate half frame LPC residual signal including preceeding samples */
+        silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order );
+
+        /* Point to first subframe of the just calculated LPC residual signal */
+        LPC_res_ptr = LPC_res + LPC_order;
+        for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) {
+            /* Measure subframe energy */
+            silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
+
+            /* Set Q values for the measured energy */
+            nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift;
+
+            /* Move to next subframe */
+            LPC_res_ptr += offset;
+        }
+        /* Move to next frame half */
+        x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset;
+    }
+
+    /* Apply the squared subframe gains */
+    for( i = 0; i < nb_subfr; i++ ) {
+        /* Fully upscale gains and energies */
+        lz1 = silk_CLZ32( nrgs[  i ] ) - 1;
+        lz2 = silk_CLZ32( gains[ i ] ) - 1;
+
+        tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
+
+        /* Find squared gains */
+        tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
+
+        /* Scale energies */
+        nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/
+        nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32;
+    }
+}