Add copy of opus library in deps/third_party.

opus/silk/float/scale_copy_vector_FLP.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:
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+this list of conditions and the following disclaimer.
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+notice, this list of conditions and the following disclaimer in the
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+- 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
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+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 "SigProc_FLP.h"
+
+/* copy and multiply a vector by a constant */
+void silk_scale_copy_vector_FLP(
+    silk_float          *data_out,
+    const silk_float    *data_in,
+    silk_float          gain,
+    opus_int            dataSize
+)
+{
+    opus_int  i, dataSize4;
+
+    /* 4x unrolled loop */
+    dataSize4 = dataSize & 0xFFFC;
+    for( i = 0; i < dataSize4; i += 4 ) {
+        data_out[ i + 0 ] = gain * data_in[ i + 0 ];
+        data_out[ i + 1 ] = gain * data_in[ i + 1 ];
+        data_out[ i + 2 ] = gain * data_in[ i + 2 ];
+        data_out[ i + 3 ] = gain * data_in[ i + 3 ];
+    }
+
+    /* any remaining elements */
+    for( ; i < dataSize; i++ ) {
+        data_out[ i ] = gain * data_in[ i ];
+    }
+}