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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.

*/

#ifndef __ardour_audio_region_h__
#define __ardour_audio_region_h__

#include <vector>
#include <list>

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

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

class XMLNode;

namespace ARDOUR {

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

class AudioRegion : public Region
{
  public:
      static Change FadeInChanged;
      static Change FadeOutChanged;
      static Change FadeInActiveChanged;
      static Change FadeOutActiveChanged;
      static Change EnvelopeActiveChanged;
      static Change ScaleAmplitudeChanged;
      static Change EnvelopeChanged;

      ~AudioRegion();

      bool source_equivalent (boost::shared_ptr<const Region>) const;

      bool speed_mismatch (float) const;

      boost::shared_ptr<AudioSource> source (uint32_t n=0) const { if (n < sources.size()) return sources[n]; else return sources[0]; } 
      const SourceList& get_sources() const { return sources; }

      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() const { return sources.size(); }
      vector<string> master_source_names();
      void set_master_sources (const SourceList&);
      const SourceList& get_master_sources() const { return master_sources; }

      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; }

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

      /* Readable interface */
      
      virtual nframes64_t read (Sample*, nframes64_t pos, nframes64_t cnt, int channel) const;
      virtual nframes64_t readable_length() const { return length(); }

      virtual nframes_t read_at (Sample *buf, Sample *mixdown_buf,
                           float *gain_buf, nframes_t position, nframes_t cnt, 
                           uint32_t       chan_n      = 0,
                           nframes_t read_frames = 0,
                           nframes_t skip_frames = 0) const;

      nframes_t master_read_at (Sample *buf, Sample *mixdown_buf, 
                  float *gain_buf,
                  nframes_t position, nframes_t cnt, uint32_t chan_n=0) const;

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

      static void set_default_fade (float steepness, nframes_t len);
      bool fade_in_is_default () const;
      bool fade_out_is_default () const;

      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 (nframes_t);
      void set_fade_in (FadeShape, nframes_t);

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

      void set_envelope_active (bool yn);
      void set_default_envelope ();

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

      /* filter */

      int apply (AudioFilter&);

      /* export */

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

      boost::shared_ptr<Region> get_parent() const;

      /* xfade/fade interactions */

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

      void set_playlist (boost::weak_ptr<Playlist>);

      int get_transients (AnalysisFeatureList&, bool force_new = false);

  private:
      friend class RegionFactory;

      AudioRegion (boost::shared_ptr<AudioSource>, nframes_t start, nframes_t length);
      AudioRegion (boost::shared_ptr<AudioSource>, nframes_t start, nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags);
      AudioRegion (const SourceList &, nframes_t start, nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags);
      AudioRegion (boost::shared_ptr<const AudioRegion>, nframes_t start, nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags);
      AudioRegion (boost::shared_ptr<const AudioRegion>);
      AudioRegion (boost::shared_ptr<AudioSource>, const XMLNode&);
      AudioRegion (SourceList &, const XMLNode&);

  private:
      void set_default_fades ();
      void set_default_fade_in ();
      void set_default_fade_out ();

      void recompute_gain_at_end ();
      void recompute_gain_at_start ();

      nframes_t _read_at (const SourceList&, nframes_t limit,
                      Sample *buf, Sample *mixdown_buffer, 
                      float *gain_buffer, nframes_t position, nframes_t cnt, 
                      uint32_t chan_n = 0,
                      nframes_t read_frames = 0,
                      nframes_t skip_frames = 0,
                      bool raw = false) const;

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

      void envelope_changed ();
      void fade_in_changed ();
      void fade_out_changed ();
      void source_offset_changed ();
      void listen_to_my_curves ();
      void listen_to_my_sources ();

      void source_deleted ();
      
      SourceList        sources;
      
      /** Used when timefx are applied, so we can always use the original source. */
      SourceList        master_sources; 

      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;

  protected:
      int set_live_state (const XMLNode&, Change&, bool send);
};

} /* 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, double);
}

#endif /* __ardour_audio_region_h__ */

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