d94659dc27
This is the first public upload of the new NetEq, version 4. It has been through extensive internal review during the course of the project. TEST=trybots Review URL: https://webrtc-codereview.appspot.com/1073005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3425 4adac7df-926f-26a2-2b94-8c16560cd09d
75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PREEMPTIVE_EXPAND_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PREEMPTIVE_EXPAND_H_
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#include <assert.h>
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#include "webrtc/modules/audio_coding/neteq4/audio_multi_vector.h"
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#include "webrtc/modules/audio_coding/neteq4/time_stretch.h"
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#include "webrtc/system_wrappers/interface/constructor_magic.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Forward declarations.
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class BackgroundNoise;
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// This class implements the PreemptiveExpand operation. Most of the work is
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// done in the base class TimeStretch, which is shared with the Accelerate
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// operation. In the PreemptiveExpand class, the operations that are specific to
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// PreemptiveExpand are implemented.
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class PreemptiveExpand : public TimeStretch {
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public:
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PreemptiveExpand(int sample_rate_hz, size_t num_channels,
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const BackgroundNoise& background_noise)
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: TimeStretch(sample_rate_hz, num_channels, background_noise),
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old_data_length_per_channel_(-1),
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overlap_samples_(5 * sample_rate_hz / 8000) {
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}
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virtual ~PreemptiveExpand() {}
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// This method performs the actual PreemptiveExpand operation. The samples are
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// read from |input|, of length |input_length| elements, and are written to
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// |output|. The number of samples added through time-stretching is
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// is provided in the output |length_change_samples|. The method returns
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// the outcome of the operation as an enumerator value.
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ReturnCodes Process(const WebRtc_Word16 *pw16_decoded,
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int len,
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int oldDataLen,
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AudioMultiVector<int16_t>* output,
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int16_t* length_change_samples);
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protected:
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// Sets the parameters |best_correlation| and |peak_index| to suitable
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// values when the signal contains no active speech.
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virtual void SetParametersForPassiveSpeech(int len,
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int16_t* w16_bestCorr,
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int* w16_bestIndex) const;
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// Checks the criteria for performing the time-stretching operation and,
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// if possible, performs the time-stretching.
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virtual ReturnCodes CheckCriteriaAndStretch(
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const WebRtc_Word16 *pw16_decoded, int len, size_t w16_bestIndex,
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int16_t w16_bestCorr, bool w16_VAD,
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AudioMultiVector<int16_t>* output) const;
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private:
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int old_data_length_per_channel_;
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int overlap_samples_;
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DISALLOW_COPY_AND_ASSIGN(PreemptiveExpand);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PREEMPTIVE_EXPAND_H_
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