PlayerSigGen.h

/* Copyright (C) 2006-2018 PUC-Rio/Laboratorio TeleMidia
 
This file is part of Ginga (Ginga-NCL).
 
Ginga 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 2 of the License, or
(at your option) any later version.
 
Ginga 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 Ginga.  If not, see <https://www.gnu.org/licenses/>.  */
 
#ifndef PLAYER_SIGGEN_H
#define PLAYER_SIGGEN_H
 
#include "Player.h"
 
namespace ginga {
 
class PlayerSigGen : public Player
{
public:
  PlayerSigGen (Formatter *, Media *);
  ~PlayerSigGen ();
  void start () override;
  void stop () override;
  void pause () override;
  void resume () override;
  void redraw (cairo_t *) override;
 
protected:
  bool doSetProperty (Property, const string &, const string &) override;
 
private:
  GstElement *_pipeline; // pipeline
  struct
  {                           // audio pipeline
    GstElement *src;          // Audio Test Src format
    GstElement *convert;      // convert audio format
    GstElement *tee;          // splits pipeline
    GstElement *audioQueue;   // links audio pipeline side
    GstElement *audioSink;    // audio sink
    GstElement *videoQueue;   // links video pipeline side
    GstElement *videoScope;   // video draw style
    GstElement *videoConvert; // convert video format
    GstElement *videoSink;    // video sink
 
    GstPad *teeAudioPad;   // tee audio pad (output)
    GstPad *queueAudioPad; // queue audio pad (input)
    GstPad *teeVideoPad;   // tee video pad (output)
    GstPad *queueVideoPad; // queue video pad (input)
  } _audio;
 
  int _sample_flag;               // true if new sample is available
  GstAppSinkCallbacks _callbacks; // video app-sink callback data
 
  struct
  {
    double freq;   // frequency
    int wave;      // wave
    double volume; // sound level
  } _prop;
 
  // GStreamer callbacks.
  static gboolean cb_Bus (GstBus *, GstMessage *, PlayerSigGen *);
  static GstFlowReturn cb_NewSample (GstAppSink *, gpointer);
};
 
}
 
#endif // PLAYER_SIGGEN_H