libs/ardour/ardour/processor.h

   1 /*
   2     Copyright (C) 2009-2010 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #ifndef __ardour_processor_h__
  21 #define __ardour_processor_h__
  22
  23 #include <vector>
  24 #include <string>
  25 #include <exception>
  26
  27 #include "pbd/statefuldestructible.h"
  28
  29 #include "ardour/ardour.h"
  30 #include "ardour/buffer_set.h"
  31 #include "ardour/latent.h"
  32 #include "ardour/session_object.h"
  33 #include "ardour/types.h"
  34 #include "ardour/automatable.h"
  35
  36 class XMLNode;
  37
  38 namespace ARDOUR {
  39
  40 class Session;
  41 class Route;
  42
  43 /* A mixer strip element - plugin, send, meter, etc.
  44  */
  45 class Processor : public SessionObject, public Automatable, public Latent
  46 {
  47   public:
  48         static const std::string state_node_name;
  49
  50         Processor(Session&, const std::string& name);
  51
  52         virtual ~Processor() { }
  53
  54         virtual std::string display_name() const { return SessionObject::name(); }
  55
  56         virtual bool display_to_user() const { return _display_to_user; }
  57         virtual void set_display_to_user (bool);
  58
  59         bool active () const { return _pending_active; }
  60
  61         bool get_next_ab_is_active () const { return _next_ab_is_active; }
  62         void set_next_ab_is_active (bool yn) { _next_ab_is_active = yn; }
  63
  64         virtual nframes_t signal_latency() const { return 0; }
  65
  66         virtual void transport_stopped (sframes_t /*frame*/) {}
  67
  68         virtual void set_block_size (nframes_t /*nframes*/) {}
  69
  70         /** @param result_required true if, on return from this method, bufs is required to contain valid data;
  71          *  if false, the method need not bother writing to bufs if it doesn't want to.
  72          */
  73         virtual void run (BufferSet& /*bufs*/, sframes_t /*start_frame*/, sframes_t /*end_frame*/, nframes_t /*nframes*/, bool result_required) {}
  74         virtual void silence (nframes_t /*nframes*/) {}
  75
  76         virtual void activate ()   { _pending_active = true; ActiveChanged(); }
  77         virtual void deactivate () { _pending_active = false; ActiveChanged(); }
  78
  79         virtual bool configure_io (ChanCount in, ChanCount out);
  80
  81         /* Derived classes should override these, or processor appears as an in-place pass-through */
  82
  83         virtual bool can_support_io_configuration (const ChanCount& in, ChanCount& out) const = 0;
  84         virtual ChanCount input_streams () const { return _configured_input; }
  85         virtual ChanCount output_streams() const { return _configured_output; }
  86
  87         /* note: derived classes should implement state(), NOT get_state(), to allow
  88            us to merge C++ inheritance and XML lack-of-inheritance reasonably
  89            smoothly.
  90          */
  91
  92         virtual XMLNode& state (bool full);
  93         XMLNode& get_state (void);
  94         int set_state (const XMLNode&, int version);
  95
  96         void *get_gui () const { return _gui; }
  97         void  set_gui (void *p) { _gui = p; }
  98
  99         void set_pre_fader (bool);
 100
 101         PBD::Signal0<void>                     ActiveChanged;
 102         PBD::Signal2<void,ChanCount,ChanCount> ConfigurationChanged;
 103
 104 protected:
 105         int       _pending_active;
 106         bool      _active;
 107         bool      _next_ab_is_active;
 108         bool      _configured;
 109         ChanCount _configured_input;
 110         ChanCount _configured_output;
 111         void*     _gui;  /* generic, we don't know or care what this is */
 112         bool      _display_to_user;
 113         bool      _pre_fader;
 114
 115 private:
 116         int set_state_2X (const XMLNode&, int version);
 117 };
 118
 119 } // namespace ARDOUR
 120
 121 #endif /* __ardour_processor_h__ */