94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*
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* Copyright (c) 2011 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_VOICE_ENGINE_DTMF_INBAND_H
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#define WEBRTC_VOICE_ENGINE_DTMF_INBAND_H
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#if _MSC_VER > 1000
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#pragma once
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#endif
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#include "typedefs.h"
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#include "voice_engine_defines.h"
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namespace webrtc {
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class CriticalSectionWrapper;
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class DtmfInband
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{
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public:
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DtmfInband(const WebRtc_Word32 id);
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virtual ~DtmfInband();
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void Init();
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int SetSampleRate(const WebRtc_UWord16 frequency);
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int GetSampleRate(WebRtc_UWord16& frequency);
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int AddTone(const WebRtc_UWord8 eventCode,
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WebRtc_Word32 lengthMs,
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WebRtc_Word32 attenuationDb);
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int ResetTone();
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int StartTone(const WebRtc_UWord8 eventCode,
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WebRtc_Word32 attenuationDb);
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int StopTone();
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bool IsAddingTone();
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int Get10msTone(WebRtc_Word16 output[320],
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WebRtc_UWord16& outputSizeInSamples);
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WebRtc_UWord32 DelaySinceLastTone() const;
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void UpdateDelaySinceLastTone();
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private:
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void ReInit();
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WebRtc_Word16 DtmfFix_generate(WebRtc_Word16* decoded,
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const WebRtc_Word16 value,
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const WebRtc_Word16 volume,
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const WebRtc_Word16 frameLen,
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const WebRtc_Word16 fs);
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private:
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enum {kDtmfFrameSizeMs = 10};
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enum {kDtmfAmpHigh = 32768};
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enum {kDtmfAmpLow = 23171}; // 3 dB lower than the high frequency
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WebRtc_Word16 DtmfFix_generateSignal(const WebRtc_Word16 a1_times2,
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const WebRtc_Word16 a2_times2,
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const WebRtc_Word16 volume,
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WebRtc_Word16* signal,
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const WebRtc_Word16 length);
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private:
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CriticalSectionWrapper& _critSect;
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WebRtc_Word32 _id;
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WebRtc_UWord16 _outputFrequencyHz; // {8000, 16000, 32000}
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WebRtc_Word16 _oldOutputLow[2]; // Data needed for oscillator model
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WebRtc_Word16 _oldOutputHigh[2]; // Data needed for oscillator model
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WebRtc_Word16 _frameLengthSamples; // {80, 160, 320}
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WebRtc_Word32 _remainingSamples;
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WebRtc_Word16 _eventCode; // [0, 15]
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WebRtc_Word16 _attenuationDb; // [0, 36]
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WebRtc_Word32 _lengthMs;
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bool _reinit; // 'true' if the oscillator should be reinit for next event
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bool _playing;
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WebRtc_UWord32 _delaySinceLastToneMS; // time since last generated tone [ms]
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};
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} // namespace webrtc
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#endif // #ifndef WEBRTC_VOICE_ENGINE_DTMF_INBAND_H
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