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      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