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audioregion.h

/*
    Copyright (C) 2000-2001 Paul Davis 

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: audioregion.h,v 1.23 2005/09/09 03:24:25 pauld Exp $
*/

#ifndef __ardour_audio_region_h__
#define __ardour_audio_region_h__

#include <vector>

#include <pbd/fastlog.h>
#include <pbd/undo.h>

#include <ardour/ardour.h>
#include <ardour/source.h>
#include <ardour/gain.h>
#include <ardour/region.h>
#include <ardour/export.h>

class XMLNode;

namespace ARDOUR {

class Route;
class Playlist;
class Session;
class AudioFilter;

struct AudioRegionState : public RegionState 
{
    AudioRegionState (std::string why);

    Curve _fade_in;
    Curve _fade_out;
    Curve _envelope;
    gain_t _scale_amplitude;
    uint32_t _fade_in_disabled;
    uint32_t _fade_out_disabled;
};

class AudioRegion : public Region
{
  public:
      typedef vector<Source *> SourceList;

      static Change FadeInChanged;
      static Change FadeOutChanged;
      static Change FadeInActiveChanged;
      static Change FadeOutActiveChanged;
      static Change EnvelopeActiveChanged;
      static Change ScaleAmplitudeChanged;
      static Change EnvelopeChanged;

      AudioRegion (Source&, jack_nframes_t start, jack_nframes_t length, bool announce = true);
      AudioRegion (Source&, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
      AudioRegion (SourceList &, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
      AudioRegion (const AudioRegion&, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
      AudioRegion (const AudioRegion&);
      AudioRegion (Source&, const XMLNode&);
      AudioRegion (SourceList &, const XMLNode&);
      ~AudioRegion();

      bool region_list_equivalent (const AudioRegion&);
      bool source_equivalent (const AudioRegion&);
      bool equivalent (const AudioRegion&);
      bool size_equivalent (const AudioRegion&);

      void lock_sources ();
      void unlock_sources ();
      Source& source (uint32_t n=0) const { if (n < sources.size()) return *sources[n]; else return *sources[0]; } 

      void set_scale_amplitude (gain_t);
      gain_t scale_amplitude() const { return _scale_amplitude; }
      
      void normalize_to (float target_in_dB = 0.0f);

      uint32_t n_channels() { return sources.size(); }
      vector<string> master_source_names();
      
      bool envelope_active () const { return _flags & Region::EnvelopeActive; }
      bool fade_in_active () const { return _flags & Region::FadeIn; }
      bool fade_out_active () const { return _flags & Region::FadeOut; }
      bool captured() const { return !(_flags & (Region::Flag (Region::Import|Region::External))); }

      Curve& fade_in()  { return _fade_in; }
      Curve& fade_out() { return _fade_out; }
      Curve& envelope() { return _envelope; }

      jack_nframes_t read_peaks (PeakData *buf, jack_nframes_t npeaks, jack_nframes_t offset, jack_nframes_t cnt, uint32_t chan_n=0, double samples_per_unit= 1.0) const;

      virtual jack_nframes_t read_at (Sample *buf, Sample *mixdown_buffer, 
                              float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, 
                              uint32_t chan_n = 0,
                              jack_nframes_t read_frames = 0,
                              jack_nframes_t skip_frames = 0) const;

      jack_nframes_t master_read_at (Sample *buf, Sample *mixdown_buffer, 
                               float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, uint32_t chan_n=0) const;


      XMLNode& state (bool);
      XMLNode& get_state ();
      int      set_state (const XMLNode&);

      static void set_default_fade (float steepness, jack_nframes_t len);

      enum FadeShape {
            Linear,
            Fast,
            Slow,
            LogA,
            LogB,

      };

      void set_fade_in_active (bool yn);
      void set_fade_in_shape (FadeShape);
      void set_fade_in_length (jack_nframes_t);
      void set_fade_in (FadeShape, jack_nframes_t);

      void set_fade_out_active (bool yn);
      void set_fade_out_shape (FadeShape);
      void set_fade_out_length (jack_nframes_t);
      void set_fade_out (FadeShape, jack_nframes_t);

      void set_envelope_active (bool yn);

      int separate_by_channel (ARDOUR::Session&, vector<AudioRegion*>&) const;

      uint32_t read_data_count() const { return _read_data_count; }

      ARDOUR::Playlist* playlist() const { return _playlist; }

      UndoAction get_memento() const;

      /* filter */

      int apply (AudioFilter&);

      /* export */

      int exportme (ARDOUR::Session&, ARDOUR::AudioExportSpecification&);

      Region* get_parent();

      /* xfade/fade interactions */

      void suspend_fade_in ();
      void suspend_fade_out ();
      void resume_fade_in ();
      void resume_fade_out ();

  private:
      friend class Playlist;

  private:
      SourceList        sources;
      SourceList        master_sources; /* used when timefx are applied, so 
                                   we can always use the original
                                   source.
                                */
      mutable Curve       _fade_in;
      FadeShape         _fade_in_shape;
      mutable Curve       _fade_out;
      FadeShape         _fade_out_shape;
      mutable Curve       _envelope;
      gain_t            _scale_amplitude;
      uint32_t          _fade_in_disabled;
      uint32_t          _fade_out_disabled;

      void set_default_fades ();
      void set_default_fade_in ();
      void set_default_fade_out ();
      void set_default_envelope ();

      StateManager::State* state_factory (std::string why) const;
      Change restore_state (StateManager::State&);

      void recompute_gain_at_end ();
      void recompute_gain_at_start ();

      bool copied() const { return _flags & Copied; }
      void maybe_uncopy ();
      void rename_after_first_edit ();

      jack_nframes_t _read_at (const SourceList&, Sample *buf, Sample *mixdown_buffer, 
                         float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, 
                         uint32_t chan_n = 0,
                         jack_nframes_t read_frames = 0,
                         jack_nframes_t skip_frames = 0) const;

      bool verify_start (jack_nframes_t position);
      bool verify_length (jack_nframes_t position);
      bool verify_start_mutable (jack_nframes_t& start);
      bool verify_start_and_length (jack_nframes_t start, jack_nframes_t length);
      void recompute_at_start ();
      void recompute_at_end ();

      void envelope_changed (Change);

      void source_deleted (Source*);
};

} /* namespace ARDOUR */

/* access from C objects */

extern "C" {
      int    region_read_peaks_from_c   (void *arg, uint32_t npeaks, uint32_t start, uint32_t length, intptr_t data, uint32_t n_chan, double samples_per_unit);
      uint32_t region_length_from_c (void *arg);
      uint32_t sourcefile_length_from_c (void *arg);
}

#endif /* __ardour_audio_region_h__ */

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