aec_resampler.h revision 14b43beb7ce4440b30dcea31196de5b4a529cb6b 
1/*
2 *  Copyright (c) 2012 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
16enum { kResamplingDelay = 1 };
17enum { kResamplerBufferSize = FRAME_LEN * 4 };
18
19// Unless otherwise specified, functions return 0 on success and -1 on error
20int WebRtcAec_CreateResampler(void **resampInst);
21int WebRtcAec_InitResampler(void *resampInst, int deviceSampleRateHz);
22int WebRtcAec_FreeResampler(void *resampInst);
23
24// Estimates skew from raw measurement.
25int WebRtcAec_GetSkew(void *resampInst, int rawSkew, float *skewEst);
26
27// Resamples input using linear interpolation.
28void WebRtcAec_ResampleLinear(void *resampInst,
29                              const short *inspeech,
30                              int size,
31                              float skew,
32                              short *outspeech,
33                              int *size_out);
34
35#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_RESAMPLER_H_
36