audio_portaudio_source.h

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/* -*- c++ -*- */
/*
 * Copyright 2006-2011 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_PORTAUDIO_SOURCE_H
#define INCLUDED_AUDIO_PORTAUDIO_SOURCE_H

#include <gr_audio_source.h>
#include <gr_buffer.h>
#include <gruel/thread.h>
#include <string>
#include <portaudio.h>
#include <stdexcept>

PaStreamCallback portaudio_source_callback;


/*!
 * \brief Audio source using PORTAUDIO
 * \ingroup audio_blk
 *
 * Input samples must be in the range [-1,1].
 */
class audio_portaudio_source : public audio_source {

  friend PaStreamCallback portaudio_source_callback;


  unsigned int          d_sampling_rate;
  std::string           d_device_name;
  bool                  d_ok_to_block;
  bool                  d_verbose;

  unsigned int          d_portaudio_buffer_size_frames; // number of frames in a portaudio buffer

  PaStream              *d_stream;
  PaStreamParameters    d_input_parameters;

  gr_buffer_sptr        d_writer;               // buffer used between work and callback
  gr_buffer_reader_sptr d_reader;

  gruel::mutex          d_ringbuffer_mutex;
  gruel::condition_variable d_ringbuffer_cond;
  bool                  d_ringbuffer_ready;

  // random stats
  int                   d_noverruns;            // count of overruns

  void output_error_msg (const char *msg, int err);
  void bail (const char *msg, int err) throw (std::runtime_error);
  void create_ringbuffer();


public:
  audio_portaudio_source (int sampling_rate, const std::string device_name,
                          bool ok_to_block);

  ~audio_portaudio_source ();

  bool check_topology (int ninputs, int noutputs);

  int work (int ninput_items,
            gr_vector_const_void_star &input_items,
            gr_vector_void_star &output_items);
};

#endif /* INCLUDED_AUDIO_PORTAUDIO_SOURCE_H */