1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_VOICE_ENGINE_DTMF_INBAND_H_ 12 #define WEBRTC_VOICE_ENGINE_DTMF_INBAND_H_ 13 14 #include "webrtc/typedefs.h" 15 #include "webrtc/voice_engine/voice_engine_defines.h" 16 17 namespace webrtc { 18 class CriticalSectionWrapper; 19 20 class DtmfInband 21 { 22 public: 23 DtmfInband(int32_t id); 24 25 virtual ~DtmfInband(); 26 27 void Init(); 28 29 int SetSampleRate(uint16_t frequency); 30 31 int GetSampleRate(uint16_t& frequency); 32 33 int AddTone(uint8_t eventCode, 34 int32_t lengthMs, 35 int32_t attenuationDb); 36 37 int ResetTone(); 38 int StartTone(uint8_t eventCode, int32_t attenuationDb); 39 40 int StopTone(); 41 42 bool IsAddingTone(); 43 44 int Get10msTone(int16_t output[320], uint16_t& outputSizeInSamples); 45 46 uint32_t DelaySinceLastTone() const; 47 48 void UpdateDelaySinceLastTone(); 49 50 private: 51 void ReInit(); 52 int16_t DtmfFix_generate(int16_t* decoded, 53 int16_t value, 54 int16_t volume, 55 int16_t frameLen, 56 int16_t fs); 57 58 private: 59 enum {kDtmfFrameSizeMs = 10}; 60 enum {kDtmfAmpHigh = 32768}; 61 enum {kDtmfAmpLow = 23171}; // 3 dB lower than the high frequency 62 63 int16_t DtmfFix_generateSignal(int16_t a1_times2, 64 int16_t a2_times2, 65 int16_t volume, 66 int16_t* signal, 67 int16_t length); 68 69 private: 70 CriticalSectionWrapper& _critSect; 71 int32_t _id; 72 uint16_t _outputFrequencyHz; // {8000, 16000, 32000} 73 int16_t _oldOutputLow[2]; // Data needed for oscillator model 74 int16_t _oldOutputHigh[2]; // Data needed for oscillator model 75 int16_t _frameLengthSamples; // {80, 160, 320} 76 int32_t _remainingSamples; 77 int16_t _eventCode; // [0, 15] 78 int16_t _attenuationDb; // [0, 36] 79 int32_t _lengthMs; 80 bool _reinit; // 'true' if the oscillator should be reinit for next event 81 bool _playing; 82 uint32_t _delaySinceLastToneMS; // time since last generated tone [ms] 83 }; 84 85 } // namespace webrtc 86 87 #endif // #ifndef WEBRTC_VOICE_ENGINE_DTMF_INBAND_H_ 88