diff src/opus-1.3/silk/float/find_LTP_FLP.c @ 69:7aeed7906520

Add Opus sources and macOS builds

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/opus-1.3/silk/float/find_LTP_FLP.c	Wed Jan 23 13:48:08 2019 +0000
@@ -0,0 +1,64 @@
+/***********************************************************************
+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_FLP.h"
+#include "tuning_parameters.h"
+
+void silk_find_LTP_FLP(
+    silk_float                      XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization         */
+    silk_float                      xX[ MAX_NB_SUBFR * LTP_ORDER ],     /* O    Weight for LTP quantization                 */
+    const silk_float                r_ptr[],                            /* I    LPC residual                                */
+    const opus_int                  lag[ MAX_NB_SUBFR ],                /* I    LTP lags                                    */
+    const opus_int                  subfr_length,                       /* I    Subframe length                             */
+    const opus_int                  nb_subfr                            /* I    number of subframes                         */
+)
+{
+    opus_int   k;
+    silk_float *xX_ptr, *XX_ptr;
+    const silk_float *lag_ptr;
+    silk_float xx, temp;
+
+    xX_ptr = xX;
+    XX_ptr = XX;
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
+        silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
+        silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
+        xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
+        temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
+        silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
+        silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
+
+        r_ptr  += subfr_length;
+        XX_ptr += LTP_ORDER * LTP_ORDER;
+        xX_ptr += LTP_ORDER;
+    }
+}