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0b489303d2
Bug: webrtc:12338 Change-Id: I85bff694dd2ead83c939c4d1945eff82e1296001 No-Presubmit: True Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227161 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34690}
60 lines
2.5 KiB
C++
60 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020 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 MODULES_AUDIO_PROCESSING_TRANSIENT_TRANSIENT_SUPPRESSOR_H_
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#define MODULES_AUDIO_PROCESSING_TRANSIENT_TRANSIENT_SUPPRESSOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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namespace webrtc {
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// Detects transients in an audio stream and suppress them using a simple
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// restoration algorithm that attenuates unexpected spikes in the spectrum.
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class TransientSuppressor {
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public:
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virtual ~TransientSuppressor() {}
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virtual int Initialize(int sample_rate_hz,
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int detector_rate_hz,
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int num_channels) = 0;
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// Processes a `data` chunk, and returns it with keystrokes suppressed from
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// it. The float format is assumed to be int16 ranged. If there are more than
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// one channel, the chunks are concatenated one after the other in `data`.
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// `data_length` must be equal to `data_length_`.
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// `num_channels` must be equal to `num_channels_`.
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// A sub-band, ideally the higher, can be used as `detection_data`. If it is
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// NULL, `data` is used for the detection too. The `detection_data` is always
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// assumed mono.
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// If a reference signal (e.g. keyboard microphone) is available, it can be
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// passed in as `reference_data`. It is assumed mono and must have the same
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// length as `data`. NULL is accepted if unavailable.
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// This suppressor performs better if voice information is available.
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// `voice_probability` is the probability of voice being present in this chunk
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// of audio. If voice information is not available, `voice_probability` must
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// always be set to 1.
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// `key_pressed` determines if a key was pressed on this audio chunk.
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// Returns 0 on success and -1 otherwise.
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virtual int Suppress(float* data,
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size_t data_length,
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int num_channels,
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const float* detection_data,
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size_t detection_length,
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const float* reference_data,
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size_t reference_length,
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float voice_probability,
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bool key_pressed) = 0;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_TRANSIENT_TRANSIENT_SUPPRESSOR_H_
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