audio_oss_sink.h

这是用python语言写的一个数字广播的信号处理工具包。利用它

/* -*- c++ -*- */
/*
 * Copyright 2004 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 * 
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_AUDIO_OSS_SINK_H
#define INCLUDED_AUDIO_OSS_SINK_H

#include <gr_sync_block.h>
#include <string>


class audio_oss_sink;
typedef boost::shared_ptr<audio_oss_sink> audio_oss_sink_sptr;

audio_oss_sink_sptr
audio_oss_make_sink (int sampling_rate,
		     const std::string dev = "",
		     bool ok_to_block = true);

/*!
 * \brief audio sink using OSS
 *
 * input signature is one or two streams of floats.
 * Input samples must be in the range [-1,1].
 */

class audio_oss_sink : public gr_sync_block {
  friend audio_oss_sink_sptr
  audio_oss_make_sink (int sampling_rate, const std::string device_name, bool ok_to_block);

  int		d_sampling_rate;
  std::string	d_device_name;
  int		d_fd;
  short	       *d_buffer;
  int		d_chunk_size;

 protected:
  audio_oss_sink (int sampling_rate, const std::string device_name = "", bool ok_to_block = true);

 public:
  ~audio_oss_sink ();
  
  int work (int noutput_items,
	    gr_vector_const_void_star &input_items,
	    gr_vector_void_star &output_items);
};

#endif /* INCLUDED_AUDIO_OSS_SINK_H */