mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-01 05:55:18 +00:00
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2012 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_CODING_NETEQ_ACCELERATE_H_
|
||
|
|
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
|
||
|
|
#include "webrtc/base/constructormagic.h"
|
||
|
|
#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
|
||
|
|
#include "webrtc/modules/audio_coding/neteq/time_stretch.h"
|
||
|
|
#include "webrtc/typedefs.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Forward declarations.
|
||
|
|
class BackgroundNoise;
|
||
|
|
|
||
|
|
// This class implements the Accelerate operation. Most of the work is done
|
||
|
|
// in the base class TimeStretch, which is shared with the PreemptiveExpand
|
||
|
|
// operation. In the Accelerate class, the operations that are specific to
|
||
|
|
// Accelerate are implemented.
|
||
|
|
class Accelerate : public TimeStretch {
|
||
|
|
public:
|
||
|
|
Accelerate(int sample_rate_hz, size_t num_channels,
|
||
|
|
const BackgroundNoise& background_noise)
|
||
|
|
: TimeStretch(sample_rate_hz, num_channels, background_noise) {
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual ~Accelerate() {}
|
||
|
|
|
||
|
|
// This method performs the actual Accelerate operation. The samples are
|
||
|
|
// read from |input|, of length |input_length| elements, and are written to
|
||
|
|
// |output|. The number of samples removed through time-stretching is
|
||
|
|
// is provided in the output |length_change_samples|. The method returns
|
||
|
|
// the outcome of the operation as an enumerator value.
|
||
|
|
ReturnCodes Process(const int16_t* input,
|
||
|
|
size_t input_length,
|
||
|
|
AudioMultiVector* output,
|
||
|
|
int16_t* length_change_samples);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// Sets the parameters |best_correlation| and |peak_index| to suitable
|
||
|
|
// values when the signal contains no active speech.
|
||
|
|
virtual void SetParametersForPassiveSpeech(size_t len,
|
||
|
|
int16_t* best_correlation,
|
||
|
|
int* peak_index) const OVERRIDE;
|
||
|
|
|
||
|
|
// Checks the criteria for performing the time-stretching operation and,
|
||
|
|
// if possible, performs the time-stretching.
|
||
|
|
virtual ReturnCodes CheckCriteriaAndStretch(
|
||
|
|
const int16_t* input, size_t input_length, size_t peak_index,
|
||
|
|
int16_t best_correlation, bool active_speech,
|
||
|
|
AudioMultiVector* output) const OVERRIDE;
|
||
|
|
|
||
|
|
private:
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(Accelerate);
|
||
|
|
};
|
||
|
|
|
||
|
|
struct AccelerateFactory {
|
||
|
|
AccelerateFactory() {}
|
||
|
|
virtual ~AccelerateFactory() {}
|
||
|
|
|
||
|
|
virtual Accelerate* Create(int sample_rate_hz,
|
||
|
|
size_t num_channels,
|
||
|
|
const BackgroundNoise& background_noise) const;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
|