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    Copyright (C) 2000-2006 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
    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_diskstream_h__
#define __ardour_diskstream_h__

#include <sigc++/signal.h>

#include <cmath>
#include <string>
#include <queue>
#include <map>
#include <vector>

#include <time.h>

#include <pbd/fastlog.h>
#include <pbd/ringbufferNPT.h>
#include <pbd/stateful.h>
#include <pbd/statefuldestructible.h> 

#include <ardour/ardour.h>
#include <ardour/configuration.h>
#include <ardour/session.h>
#include <ardour/route_group.h>
#include <ardour/route.h>
#include <ardour/port.h>
#include <ardour/utils.h>

struct tm;

namespace ARDOUR {

class AudioEngine;
class Send;
class Session;
class Playlist;
class IO;

class Diskstream : public PBD::StatefulDestructible
      enum Flag {
            Recordable = 0x1,
            Hidden = 0x2,
            Destructive = 0x4

      Diskstream (Session &, const string& name, Flag f = Recordable);
      Diskstream (Session &, const XMLNode&);
      virtual ~Diskstream();

      string      name () const { return _name; }
      virtual int set_name (string str);

      ARDOUR::IO* io() const { return _io; }
      void set_io (ARDOUR::IO& io);

      virtual float playback_buffer_load() const = 0;
      virtual float capture_buffer_load() const = 0;

      void set_flag (Flag f)   { _flags = Flag (_flags | f); }
      void unset_flag (Flag f) { _flags = Flag (_flags & ~f); }

      AlignStyle alignment_style() const { return _alignment_style; }
      void       set_align_style (AlignStyle);
      void       set_persistent_align_style (AlignStyle a) { _persistent_alignment_style = a; }
      nframes_t roll_delay() const { return _roll_delay; }
      void           set_roll_delay (nframes_t);

      bool         record_enabled() const { return g_atomic_int_get (&_record_enabled); }
      virtual void set_record_enabled (bool yn) = 0;

      bool destructive() const { return _flags & Destructive; }
      virtual int set_destructive (bool yn) { return -1; }
      virtual     bool can_become_destructive (bool& requires_bounce) const { return false; }

      bool           hidden()      const { return _flags & Hidden; }
      bool           recordable()  const { return _flags & Recordable; }
      bool           reversed()    const { return _actual_speed < 0.0f; }
      double         speed()       const { return _visible_speed; }
      virtual void punch_in()  {}
      virtual void punch_out() {}

      void set_speed (double);
      void non_realtime_set_speed ();

      boost::shared_ptr<Playlist> playlist () { return _playlist; }

      virtual int use_playlist (boost::shared_ptr<Playlist>);
      virtual int use_new_playlist () = 0;
      virtual int use_copy_playlist () = 0;

      nframes_t current_capture_start() const { return capture_start_frame; }
      nframes_t current_capture_end()   const { return capture_start_frame + capture_captured; }
      nframes_t get_capture_start_frame (uint32_t n=0);
      nframes_t get_captured_frames (uint32_t n=0);
      uint32_t n_channels() { return _n_channels; }

      static nframes_t disk_io_frames() { return disk_io_chunk_frames; }
      static void set_disk_io_chunk_frames (uint32_t n) { disk_io_chunk_frames = n; }

      /* Stateful */
      virtual XMLNode& get_state(void) = 0;
      virtual int      set_state(const XMLNode& node) = 0;
      // FIXME: makes sense for all diskstream types?
      virtual void monitor_input (bool) {}

      nframes_t capture_offset() const { return _capture_offset; }
      virtual void   set_capture_offset ();

      bool slaved() const      { return _slaved; }
      void set_slaved(bool yn) { _slaved = yn; }

      int set_loop (Location *loc);

      std::list<boost::shared_ptr<Region> >& last_capture_regions () { return _last_capture_regions; }

      void handle_input_change (IOChange, void *src);

      void remove_region_from_last_capture (boost::weak_ptr<Region> wregion);

      sigc::signal<void>            RecordEnableChanged;
      sigc::signal<void>            SpeedChanged;
      sigc::signal<void>            ReverseChanged;
      sigc::signal<void>            PlaylistChanged;
      sigc::signal<void>            AlignmentStyleChanged;
      sigc::signal<void,Location *> LoopSet;

      static sigc::signal<void>                DiskOverrun;
      static sigc::signal<void>                DiskUnderrun;

      friend class Session;

      /* the Session is the only point of access for these because they require
       * that the Session is "inactive" while they are called.

      virtual void set_pending_overwrite (bool) = 0;
      virtual int  overwrite_existing_buffers () = 0;
      virtual void set_block_size (nframes_t) = 0;
      virtual int  internal_playback_seek (nframes_t distance) = 0;
      virtual int  can_internal_playback_seek (nframes_t distance) = 0;
      virtual int  rename_write_sources () = 0;
      virtual void reset_write_sources (bool, bool force = false) = 0;
      virtual void non_realtime_input_change () = 0;

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

      friend class Auditioner;
      virtual int  seek (nframes_t which_sample, bool complete_refill = false) = 0;

      friend class Track;

      virtual void prepare ();
      virtual int  process (nframes_t transport_frame, nframes_t nframes, nframes_t offset, bool can_record, bool rec_monitors_input) = 0;
      virtual bool commit  (nframes_t nframes) = 0;
      virtual void recover (); /* called if commit will not be called, but process was */

      enum TransitionType {
            CaptureStart = 0,
      struct CaptureTransition {
            TransitionType   type;
            nframes_t   capture_val; ///< The start or end file frame position

      /* The two central butler operations */
      virtual int do_flush (Session::RunContext context, bool force = false) = 0;
      virtual int do_refill () = 0;
      /** For non-butler contexts (allocates temporary working buffers) */
      virtual int do_refill_with_alloc() = 0;
      /* XXX fix this redundancy ... */

      virtual void playlist_changed (Change);
      virtual void playlist_modified ();
      virtual void playlist_deleted (boost::weak_ptr<Playlist>);

      virtual void transport_stopped (struct tm&, time_t, bool abort) = 0;
      virtual void transport_looped (nframes_t transport_frame) = 0;

      struct CaptureInfo {
          uint32_t start;
          uint32_t frames;

      virtual void init (Flag);

      virtual int use_new_write_source (uint32_t n=0) = 0;

      virtual int find_and_use_playlist (const string&) = 0;

      virtual void allocate_temporary_buffers () = 0;

      virtual bool realtime_set_speed (double, bool global_change);

      std::list<boost::shared_ptr<Region> > _last_capture_regions;

      virtual int use_pending_capture_data (XMLNode& node) = 0;

      virtual void get_input_sources () = 0;
      virtual void check_record_status (nframes_t transport_frame, nframes_t nframes, bool can_record) = 0;
      virtual void set_align_style_from_io() {}
      virtual void setup_destructive_playlist () = 0;
      virtual void use_destructive_playlist () = 0;

      static nframes_t disk_io_chunk_frames;
      std::vector<CaptureInfo*>  capture_info;
      Glib::Mutex           capture_info_lock;

      uint32_t i_am_the_modifier;

      string            _name;
      ARDOUR::Session&  _session;
      ARDOUR::IO*       _io;
      uint32_t          _n_channels;

      boost::shared_ptr<Playlist> _playlist;

      mutable gint             _record_enabled;
      double                   _visible_speed;
      double                   _actual_speed;
      /* items needed for speed change logic */
      bool                     _buffer_reallocation_required;
      bool                     _seek_required;
      bool                      force_refill;
      nframes_t            capture_start_frame;
      nframes_t            capture_captured;
      bool                      was_recording;
      nframes_t            adjust_capture_position;
      nframes_t           _capture_offset;
      nframes_t           _roll_delay;
      nframes_t            first_recordable_frame;
      nframes_t            last_recordable_frame;
      int                       last_possibly_recording;
      AlignStyle               _alignment_style;
      bool                     _scrubbing;
      bool                     _slaved;
      bool                     _processed;
      Location*                 loop_location;
      nframes_t            overwrite_frame;
      off_t                     overwrite_offset;
      bool                      pending_overwrite;
      bool                      overwrite_queued;
      IOChange                  input_change_pending;
      nframes_t            wrap_buffer_size;
      nframes_t            speed_buffer_size;

      uint64_t                  last_phase;
      uint64_t                  phi;
      uint64_t                  target_phi;
      nframes_t            file_frame;          
      nframes_t            playback_sample;
      nframes_t            playback_distance;
      bool                 commit_should_unlock;

      uint32_t                 _read_data_count;
      uint32_t                 _write_data_count;

      bool                      in_set_state;
      AlignStyle               _persistent_alignment_style;
      bool                      first_input_change;

      Glib::Mutex  state_lock;

      nframes_t scrub_start;
      nframes_t scrub_buffer_size;
      nframes_t scrub_offset;

      sigc::connection ports_created_c;
      sigc::connection plmod_connection;
      sigc::connection plgone_connection;
      Flag _flags;

}; /* namespace ARDOUR */

#endif /* __ardour_diskstream_h__ */

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