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604fd2f1ab
Bug: webrtc:13555, webrtc:13082 Change-Id: I2c2cbcbd918f0cfa970c1a964893220ba11d4b41 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/247960 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: (Daniel.L) Byoungchan Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#35771}
57 lines
2.1 KiB
C++
57 lines
2.1 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 MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_
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#define MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "modules/audio_coding/neteq/audio_multi_vector.h"
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namespace webrtc {
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// This class provides a generator for DTMF tones.
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class DtmfToneGenerator {
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public:
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enum ReturnCodes {
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kNotInitialized = -1,
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kParameterError = -2,
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};
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DtmfToneGenerator();
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virtual ~DtmfToneGenerator() {}
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DtmfToneGenerator(const DtmfToneGenerator&) = delete;
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DtmfToneGenerator& operator=(const DtmfToneGenerator&) = delete;
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virtual int Init(int fs, int event, int attenuation);
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virtual void Reset();
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virtual int Generate(size_t num_samples, AudioMultiVector* output);
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virtual bool initialized() const;
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private:
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static const int kCoeff1[4][16]; // 1st oscillator model coefficient table.
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static const int kCoeff2[4][16]; // 2nd oscillator model coefficient table.
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static const int kInitValue1[4][16]; // Initialization for 1st oscillator.
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static const int kInitValue2[4][16]; // Initialization for 2nd oscillator.
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static const int kAmplitude[64]; // Amplitude for 0 through -63 dBm0.
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static const int16_t kAmpMultiplier = 23171; // 3 dB attenuation (in Q15).
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bool initialized_; // True if generator is initialized properly.
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int coeff1_; // 1st oscillator coefficient for this event.
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int coeff2_; // 2nd oscillator coefficient for this event.
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int amplitude_; // Amplitude for this event.
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int16_t sample_history1_[2]; // Last 2 samples for the 1st oscillator.
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int16_t sample_history2_[2]; // Last 2 samples for the 2nd oscillator.
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_
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