mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 13:50:40 +01:00
988cc0870b
This CL is the result of running include-what-you-use tool on part of the code base (audio target and dependencies) plus manual fixes. bug: webrtc:8311 Change-Id: I277d281ce943c3ecc1bd45fd8d83055931743604 Reviewed-on: https://webrtc-review.googlesource.com/c/106280 Commit-Queue: Yves Gerey <yvesg@google.com> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25311}
51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
/*
|
|
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef MODULES_AUDIO_CODING_NETEQ_CROSS_CORRELATION_H_
|
|
#define MODULES_AUDIO_CODING_NETEQ_CROSS_CORRELATION_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
namespace webrtc {
|
|
|
|
// The function calculates the cross-correlation between two sequences
|
|
// |sequence_1| and |sequence_2|. |sequence_1| is taken as reference, with
|
|
// |sequence_1_length| as its length. |sequence_2| slides for the calculation of
|
|
// cross-correlation. The result will be saved in |cross_correlation|.
|
|
// |cross_correlation_length| correlation points are calculated.
|
|
// The corresponding lag starts from 0, and increases with a step of
|
|
// |cross_correlation_step|. The result is without normalization. To avoid
|
|
// overflow, the result will be right shifted. The amount of shifts will be
|
|
// returned.
|
|
//
|
|
// Input:
|
|
// - sequence_1 : First sequence (reference).
|
|
// - sequence_2 : Second sequence (sliding during calculation).
|
|
// - sequence_1_length : Length of |sequence_1|.
|
|
// - cross_correlation_length : Number of cross-correlations to calculate.
|
|
// - cross_correlation_step : Step in the lag for the cross-correlation.
|
|
//
|
|
// Output:
|
|
// - cross_correlation : The cross-correlation in Q(-right_shifts)
|
|
//
|
|
// Return:
|
|
// Number of right shifts in cross_correlation.
|
|
|
|
int CrossCorrelationWithAutoShift(const int16_t* sequence_1,
|
|
const int16_t* sequence_2,
|
|
size_t sequence_1_length,
|
|
size_t cross_correlation_length,
|
|
int cross_correlation_step,
|
|
int32_t* cross_correlation);
|
|
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_AUDIO_CODING_NETEQ_CROSS_CORRELATION_H_
|