c++ - 在分层 block 中使用 gr::fec::code::cc_encoder 类

Question

我已经实现了一个非常基本的 C++ CCSDS 卷积编码器(k = 7，r = 1/2)并且工作正常。但是，它非常基础，缺少操作模式(CC_STREAMING、CC_TERMINATED、CC_TAILBITING、CC_TRUNCATED 等选项) 等..等

因此，我决定使用默认的 gnuradio gr::fec::code::cc_encoder 类。我的编码父类(super class)将包括打洞和其他 block ，因此所有内容都将在一个分层 block 中。到目前为止，我将 block 一个一个地放在以 gr::fec::code::cc_encoder 开头的分层 block 中。下面是我的 .cc 实现文件。

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnuradio/io_signature.h>
#include "debug_conv_encoder_impl.h"

namespace gr {
    namespace baseband {

debug_conv_encoder::sptr
debug_conv_encoder::make(int frame_size, std::vector<int> polys, int mode, int pad)
{
  return gnuradio::get_initial_sptr
    (new debug_conv_encoder_impl(frame_size, polys, mode, pad));
}

/*
 * The private constructor
 */
debug_conv_encoder_impl::debug_conv_encoder_impl(int frame_size, std::vector<int> polys, int mode, int pad)
  : gr::hier_block2("debug_conv_encoder",
          gr::io_signature::make(1, 1, sizeof(unsigned char)),
          gr::io_signature::make(1, 1, sizeof(unsigned char)))
{
  //Creating convolutional encoder
  int k = 7;
  int rate = 2;
  bool d_pad = (pad == 1) ? true : false;
  cc_mode_t d_mode = get_mode(mode);
  gr::fec::code::cc_encoder::sptr encoder(gr::fec::code::cc_encoder::make(frame_size,k,rate,polys,0,d_mode,d_pad));
  //connect(self(),0,self(),0); -- Works fine
  connect(self() , 0 , encoder , 0); // --gives an error
  connect(encoder , 0 , self() , 0); // --gives an error
  //connect(encoder);
}
cc_mode_t debug_conv_encoder_impl::get_mode(int mode)
     {
 switch(mode)
   {
   case 0:
 return CC_STREAMING;
   case 1:
 return CC_TERMINATED;
   case 2:
 return CC_TRUNCATED;
   case 3:
 return CC_TAILBITING;
   default:
 return CC_STREAMING;
   }
   }

/*
 * Our virtual destructor.
 */
debug_conv_encoder_impl::~debug_conv_encoder_impl()
{
}


   } /* namespace baseband */
} /* namespace gr */

这是头文件

#ifndef INCLUDED_BASEBAND_DEBUG_CONV_ENCODER_IMPL_H
#define INCLUDED_BASEBAND_DEBUG_CONV_ENCODER_IMPL_H

#include <baseband/debug_conv_encoder.h>
#include <gnuradio/fec/cc_encoder.h>
namespace gr {
  namespace baseband {

class debug_conv_encoder_impl : public debug_conv_encoder
{
 private:
    cc_mode_t get_mode(int mode);

 public:
  debug_conv_encoder_impl(int frame_size, std::vector<int> polys, int mode, int pad);
  ~debug_conv_encoder_impl();

   // Where all the action really happens
  };

    } // namespace baseband
 } // namespace gr

 #endif /* INCLUDED_BASEBAND_DEBUG_CONV_ENCODER_IMPL_H */

不幸的是，编译和链接文件(cmake .. && make)给出了这个错误:

xxx/GRC/baseband/gr-baseband/lib/debug_conv_encoder_impl.cc:53:39: error: no matching function for call to ‘gr::baseband::debug_conv_encoder_impl::connect(gr::hier_block2::opaque_self, int, gr::fec::generic_encoder::sptr&, int)’
   connect(self() , 0 , encoder , 0);
/usr/local/include/gnuradio/hier_block2.h:105:10: note:   no known conversion for argument 3 from ‘gr::fec::generic_encoder::sptr {aka boost::shared_ptr<gr::fec::generic_encoder>}’ to ‘gr::basic_block_sptr {aka boost::shared_ptr<gr::basic_block>}’

基本上，行“gr::fec::generic_encoder::sptr {aka boost::shared_ptr }'到'gr::basic_block_sptr {aka boost::shared_ptr }'"意味着共享指针 gr::fec::generic_encoder 不能按照 hier_block2.connect (basic_block_sptr src, int src_port, basic_block_sptr dst, int dst_port) 的要求转换为 gr::basic_block。

我用这种方式创建了很多层次 block ，但从未遇到过这个错误。我很确定我缺少一些重要的东西。任何帮助将不胜感激。顺便说一下，如果需要更多信息，请告诉我。干杯。

Answer 1

我终于能够解决这个问题。事实证明，Gnu radio FECAPI 提供编码器变量来定义 FEC 属性(派生自 gr::fec::generic_encoder 类的类，例如 cc_encoder、ldpc_encoder 等)和部署变量(与 GNU 中的调度程序和编码器变量交互) radio 流图。部署变量“gr::fec::encoder”可以与许多编码器变量一起使用，例如 cc_encoder 或 LDPC 编码器。工作函数现在如下所示。OOT现在可以正常编译和工作了。

debug_conv_encoder_impl::debug_conv_encoder_impl(int frame_size, std::vector<int> polys, int mode, int pad)
  : gr::hier_block2("debug_conv_encoder",
          gr::io_signature::make(1, 1, sizeof(unsigned char)),
          gr::io_signature::make(1, 1, sizeof(unsigned char)))
{
  //Creating a coder variable
  int k = 7;
  int rate = 2;
  bool d_pad = (pad == 1) ? true : false;
  cc_mode_t d_mode = get_mode(mode);
  gr::fec::code::cc_encoder::sptr coder_variable(gr::fec::code::cc_encoder::make(frame_size,k,rate,polys,0,d_mode,d_pad));

  //Creating a deployment variable
  gr::fec::encoder::sptr coder_deployment(gr::fec::encoder::make(coder_variable,sizeof(unsigned char),sizeof(unsigned char)));
  connect(self() , 0 , coder_deployment , 0);
  connect(coder_deployment , 0 , self() , 0);
  //connect(encoder);
}