CWGenerator.hxx

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/*
Copyright (c) 2012,2013,2014 Matthew H. Reilly (kb1vc)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CW_GENERATOR_HDR
#define CW_GENERATOR_HDR

#include "SoDaBase.hxx"
#include "MultiMBox.hxx"
#include "Command.hxx"
#include "Params.hxx"
#include <map>

namespace SoDa {
  class CWGenerator {
  public:
    CWGenerator(DatMBox * cw_env_stream, double _samp_rate, unsigned int _env_buf_len);

    void setCWSpeed(unsigned int wpm);

    unsigned int getCWSpeed() { return words_per_minute; }

    bool readyForMore();

    bool sendChar(char c);
    
  private:

    void appendToOut(const float * v, unsigned int vlen);

    void flushBuffer();

    void clearBuffer();

    SoDaBuf * getFreeSoDaBuf() {
      SoDaBuf * sb = NULL;
      if(env_stream != NULL) {
    sb = env_stream->alloc();
      }
      if(sb == NULL) {
    sb = new SoDaBuf(env_buf_len); 
      }
      return sb; 
    }

    void initMorseMap();
    
    // configuration params. 
    DatMBox * env_stream;  
    double sample_rate;  
    unsigned int env_buf_len; 

    // timing parameters
    unsigned int words_per_minute; 
    unsigned int edge_sample_count; 
 
    unsigned int bufs_per_sec; 

    // envelopes are float buffers.
    float * dit; 
    unsigned int dit_len; 
    float * dah; 
    unsigned int dah_len; 
    float * inter_char_space; 
    unsigned int ics_len; 
    float * inter_word_space; 
    unsigned int first_iws_len; 
    unsigned int iws_len; 
    
    // edges are float buffers too
    float * rising_edge; 
    float * falling_edge; 

    static std::map<char, std::string> morse_map; 

    // current output buffer
    SoDaBuf * cur_buf; 
    unsigned int cur_buf_idx; 
    unsigned int cur_buf_len; 
    
    // state of the translator
    bool in_digraph; 
    bool last_was_space; 
  }; 
}

#endif