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audiosource.h

/*
    Copyright (C) 2000 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_source_h__
#define __ardour_audio_source_h__

#include <list>
#include <vector>

#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

#include <time.h>

#include <glibmm/thread.h>
#include <glibmm/ustring.h>

#include <sigc++/signal.h>

#include <ardour/source.h>
#include <ardour/ardour.h>
#include <pbd/stateful.h> 
#include <pbd/xml++.h>

using std::list;
using std::vector;
using Glib::ustring;

namespace ARDOUR {

const nframes_t frames_per_peak = 256;

 class AudioSource : public Source, public boost::enable_shared_from_this<ARDOUR::AudioSource>
{
  public:
      AudioSource (Session&, ustring name);
      AudioSource (Session&, const XMLNode&);
      virtual ~AudioSource ();

      /* one could argue that this should belong to Source, but other data types
         generally do not come with a model of "offset along an audio timeline"
         so its here in AudioSource for now.
      */

      virtual nframes_t natural_position() const { return 0; }
      
      /* returns the number of items in this `audio_source' */

      virtual nframes_t length() const {
            return _length;
      }

      virtual nframes_t available_peaks (double zoom) const;

      virtual nframes_t read (Sample *dst, nframes_t start, nframes_t cnt) const;
      virtual nframes_t write (Sample *src, nframes_t cnt);

      virtual float sample_rate () const = 0;

      virtual void mark_for_remove() = 0;
      virtual void mark_streaming_write_completed () {}

      virtual bool can_truncate_peaks() const { return true; }

      void set_captured_for (ustring str) { _captured_for = str; }
      ustring captured_for() const { return _captured_for; }

      uint32_t read_data_count() const { return _read_data_count; }
      uint32_t write_data_count() const { return _write_data_count; }

      virtual int read_peaks (PeakData *peaks, nframes_t npeaks, nframes_t start, nframes_t cnt, double samples_per_unit) const;
      int  build_peaks ();
      bool peaks_ready (sigc::slot<void>, sigc::connection&) const;

      mutable sigc::signal<void>  PeaksReady;
      mutable sigc::signal<void,nframes_t,nframes_t>  PeakRangeReady;
      
      XMLNode& get_state ();
      int set_state (const XMLNode&);

      int rename_peakfile (ustring newpath);
      void touch_peakfile ();

      static void set_build_missing_peakfiles (bool yn) {
            _build_missing_peakfiles = yn;
      }

      static void set_build_peakfiles (bool yn) {
            _build_peakfiles = yn;
      }

      virtual int setup_peakfile () { return 0; }

      int prepare_for_peakfile_writes ();
      void done_with_peakfile_writes ();

  protected:
      static bool _build_missing_peakfiles;
      static bool _build_peakfiles;

      bool                _peaks_built;
      mutable Glib::Mutex _lock;
      nframes_t           _length;
      ustring               peakpath;
      ustring              _captured_for;

      mutable uint32_t _read_data_count;  // modified in read()
      mutable uint32_t _write_data_count; // modified in write()

      int initialize_peakfile (bool newfile, ustring path);
      int build_peaks_from_scratch ();
      int compute_and_write_peaks (Sample* buf, nframes_t first_frame, nframes_t cnt, bool force);
      void truncate_peakfile();

      mutable off_t _peak_byte_max; // modified in compute_and_write_peak()

      virtual nframes_t read_unlocked (Sample *dst, nframes_t start, nframes_t cnt) const = 0;
      virtual nframes_t write_unlocked (Sample *dst, nframes_t cnt) = 0;
      virtual ustring peak_path(ustring audio_path) = 0;
      virtual ustring old_peak_path(ustring audio_path) = 0;
      
      void update_length (nframes_t pos, nframes_t cnt);

  private:
      int peakfile;
      nframes_t peak_leftover_cnt;
      nframes_t peak_leftover_size;
      Sample* peak_leftovers;
      nframes_t peak_leftover_frame;

      bool file_changed (ustring path);
};

}

#endif /* __ardour_audio_source_h__ */

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