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/*
* Copyright (c) 2011 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 WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_
#include "typedefs.h"
#include "signal_processing_library.h"
namespace webrtc {
/*
* SplittingFilterbank_analysisQMF(...)
*
* Splits a super-wb signal into two subbands: 0-8 kHz and 8-16 kHz.
*
* Input:
* - in_data : super-wb audio signal
*
* Input & Output:
* - filt_state1: Filter state for first all-pass filter
* - filt_state2: Filter state for second all-pass filter
*
* Output:
* - low_band : The signal from the 0-4 kHz band
* - high_band : The signal from the 4-8 kHz band
*/
void SplittingFilterAnalysis(const WebRtc_Word16* in_data,
WebRtc_Word16* low_band,
WebRtc_Word16* high_band,
WebRtc_Word32* filt_state1,
WebRtc_Word32* filt_state2);
/*
* SplittingFilterbank_synthesisQMF(...)
*
* Combines the two subbands (0-8 and 8-16 kHz) into a super-wb signal.
*
* Input:
* - low_band : The signal with the 0-8 kHz band
* - high_band : The signal with the 8-16 kHz band
*
* Input & Output:
* - filt_state1: Filter state for first all-pass filter
* - filt_state2: Filter state for second all-pass filter
*
* Output:
* - out_data : super-wb speech signal
*/
void SplittingFilterSynthesis(const WebRtc_Word16* low_band,
const WebRtc_Word16* high_band,
WebRtc_Word16* out_data,
WebRtc_Word32* filt_state1,
WebRtc_Word32* filt_state2);
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_
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