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/*
* Copyright (c) 2011 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_VOICE_ENGINE_DTMF_INBAND_H_
#define WEBRTC_VOICE_ENGINE_DTMF_INBAND_H_
#include "webrtc/typedefs.h"
#include "webrtc/voice_engine/voice_engine_defines.h"
namespace webrtc {
class CriticalSectionWrapper;
class DtmfInband
{
public:
DtmfInband(int32_t id);
virtual ~DtmfInband();
void Init();
int SetSampleRate(uint16_t frequency);
int GetSampleRate(uint16_t& frequency);
int AddTone(uint8_t eventCode,
int32_t lengthMs,
int32_t attenuationDb);
int ResetTone();
int StartTone(uint8_t eventCode, int32_t attenuationDb);
int StopTone();
bool IsAddingTone();
int Get10msTone(int16_t output[320], uint16_t& outputSizeInSamples);
uint32_t DelaySinceLastTone() const;
void UpdateDelaySinceLastTone();
private:
void ReInit();
int16_t DtmfFix_generate(int16_t* decoded,
int16_t value,
int16_t volume,
int16_t frameLen,
int16_t fs);
private:
enum {kDtmfFrameSizeMs = 10};
enum {kDtmfAmpHigh = 32768};
enum {kDtmfAmpLow = 23171}; // 3 dB lower than the high frequency
int16_t DtmfFix_generateSignal(int16_t a1_times2,
int16_t a2_times2,
int16_t volume,
int16_t* signal,
int16_t length);
private:
CriticalSectionWrapper& _critSect;
int32_t _id;
uint16_t _outputFrequencyHz; // {8000, 16000, 32000}
int16_t _oldOutputLow[2]; // Data needed for oscillator model
int16_t _oldOutputHigh[2]; // Data needed for oscillator model
int16_t _frameLengthSamples; // {80, 160, 320}
int32_t _remainingSamples;
int16_t _eventCode; // [0, 15]
int16_t _attenuationDb; // [0, 36]
int32_t _lengthMs;
bool _reinit; // 'true' if the oscillator should be reinit for next event
bool _playing;
uint32_t _delaySinceLastToneMS; // time since last generated tone [ms]
};
} // namespace webrtc
#endif // #ifndef WEBRTC_VOICE_ENGINE_DTMF_INBAND_H_
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