1 /*
2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_RESAMPLER_H_
12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_RESAMPLER_H_
13 
14 #include "aec_core.h"
15 
16 enum { kResamplingDelay = 1 };
17 enum { kResamplerBufferSize = FRAME_LEN * 4 };
18 
19 // Unless otherwise specified, functions return 0 on success and -1 on error
20 int WebRtcAec_CreateResampler(void **resampInst);
21 int WebRtcAec_InitResampler(void *resampInst, int deviceSampleRateHz);
22 int WebRtcAec_FreeResampler(void *resampInst);
23 
24 // Estimates skew from raw measurement.
25 int WebRtcAec_GetSkew(void *resampInst, int rawSkew, float *skewEst);
26 
27 // Resamples input using linear interpolation.
28 // Returns size of resampled array.
29 int WebRtcAec_ResampleLinear(void *resampInst,
30                              const short *inspeech,
31                              int size,
32                              float skew,
33                              short *outspeech);
34 
35 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_RESAMPLER_H_
36