12bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/***********************************************************************
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152bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh VenkatasubramanianTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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212bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh VenkatasubramanianSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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262bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian***********************************************************************/
272bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian
282bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#ifdef HAVE_CONFIG_H
292bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include "config.h"
302bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#endif
312bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian
322bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include "typedef.h"
332bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include "SigProc_FLP.h"
342bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian
352bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/* compute autocorrelation */
362bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanianvoid silk_autocorrelation_FLP(
372bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    silk_float          *results,           /* O    result (length correlationCount)                            */
382bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    const silk_float    *inputData,         /* I    input data to correlate                                     */
392bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    opus_int            inputDataSize,      /* I    length of input                                             */
402bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    opus_int            correlationCount    /* I    number of correlation taps to compute                       */
412bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian)
422bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian{
432bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    opus_int i;
442bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian
452bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    if( correlationCount > inputDataSize ) {
462bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian        correlationCount = inputDataSize;
472bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    }
482bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian
492bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    for( i = 0; i < correlationCount; i++ ) {
502bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian        results[ i ] =  (silk_float)silk_inner_product_FLP( inputData, inputData + i, inputDataSize - i );
512bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian    }
522bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian}
53