Fix broken whitespace. I'd apologize for the compile times if it was my fault :D
[ardour.git] / libs / ardour / diskstream.cc
index 812709cda13670e8cffaa9d6e5e97e3b6c730c48..9d5925322d42a3afa93584f71c4febcac3585ff9 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2000-2006 Paul Davis 
+    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
 #include <sys/stat.h>
 #include <sys/mman.h>
 
-#include <sigc++/bind.h>
 
-#include <pbd/error.h>
-#include <pbd/basename.h>
 #include <glibmm/thread.h>
-#include <pbd/xml++.h>
-
-#include <ardour/ardour.h>
-#include <ardour/audioengine.h>
-#include <ardour/diskstream.h>
-#include <ardour/utils.h>
-#include <ardour/configuration.h>
-#include <ardour/audiofilesource.h>
-#include <ardour/send.h>
-#include <ardour/playlist.h>
-#include <ardour/cycle_timer.h>
-#include <ardour/region.h>
+
+#include "pbd/error.h"
+#include "pbd/basename.h"
+#include "pbd/memento_command.h"
+#include "pbd/xml++.h"
+#include "pbd/stacktrace.h"
+
+#include "ardour/ardour.h"
+#include "ardour/audioengine.h"
+#include "ardour/debug.h"
+#include "ardour/diskstream.h"
+#include "ardour/utils.h"
+#include "ardour/configuration.h"
+#include "ardour/audiofilesource.h"
+#include "ardour/send.h"
+#include "ardour/pannable.h"
+#include "ardour/panner_shell.h"
+#include "ardour/playlist.h"
+#include "ardour/cycle_timer.h"
+#include "ardour/region.h"
+#include "ardour/panner.h"
+#include "ardour/session.h"
+#include "ardour/io.h"
+#include "ardour/track.h"
 
 #include "i18n.h"
 #include <locale.h>
@@ -56,98 +65,148 @@ using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-/* XXX This goes uninitialized when there is no ~/.ardour2 directory.
+/* XXX This goes uninitialized when there is no ~/.config/ardour3 directory.
  * I can't figure out why, so this will do for now (just stole the
  * default from configuration_vars.h).  0 is not a good value for
  * allocating buffer sizes..
  */
-nframes_t Diskstream::disk_io_chunk_frames = 1024 * 256;
+ARDOUR::framecnt_t Diskstream::disk_io_chunk_frames = 1024 * 256;
 
-sigc::signal<void>                Diskstream::DiskOverrun;
-sigc::signal<void>                Diskstream::DiskUnderrun;
+PBD::Signal0<void>                Diskstream::DiskOverrun;
+PBD::Signal0<void>                Diskstream::DiskUnderrun;
 
 Diskstream::Diskstream (Session &sess, const string &name, Flag flag)
-       : _name (name)
-       , _session (sess)
-{
-       init (flag);
-}
-       
-Diskstream::Diskstream (Session& sess, const XMLNode& node)
-       : _session (sess)
+       : SessionObject(sess, name)
+        , i_am_the_modifier (0)
+        , _track (0)
+        , _record_enabled (0)
+        , _visible_speed (1.0f)
+        , _actual_speed (1.0f)
+        , _buffer_reallocation_required (false)
+        , _seek_required (false)
+        , force_refill (false)
+        , capture_start_frame (0)
+        , capture_captured (0)
+        , was_recording (false)
+        , adjust_capture_position (0)
+        , _capture_offset (0)
+        , _roll_delay (0)
+        , first_recordable_frame (max_framepos)
+        , last_recordable_frame (max_framepos)
+        , last_possibly_recording (0)
+        , _alignment_style (ExistingMaterial)
+        , _alignment_choice (Automatic)
+        , _scrubbing (false)
+        , _slaved (false)
+        , loop_location (0)
+        , overwrite_frame (0)
+        , overwrite_offset (0)
+        , _pending_overwrite (false)
+        , overwrite_queued (false)
+        , wrap_buffer_size (0)
+        , speed_buffer_size (0)
+        , _speed (1.0)
+        , _target_speed (_speed)
+        , file_frame (0)
+        , playback_sample (0)
+        , playback_distance (0)
+        , _read_data_count (0)
+        , _write_data_count (0)
+        , in_set_state (false)
+        , _flags (flag)
+        , deprecated_io_node (0)
 {
-       init (Recordable);
 }
 
-void
-Diskstream::init (Flag f)
+Diskstream::Diskstream (Session& sess, const XMLNode& /*node*/)
+       : SessionObject(sess, "unnamed diskstream")
+        , i_am_the_modifier (0)
+        , _track (0)
+        , _record_enabled (0)
+        , _visible_speed (1.0f)
+        , _actual_speed (1.0f)
+        , _buffer_reallocation_required (false)
+        , _seek_required (false)
+        , force_refill (false)
+        , capture_start_frame (0)
+        , capture_captured (0)
+        , was_recording (false)
+        , adjust_capture_position (0)
+        , _capture_offset (0)
+        , _roll_delay (0)
+        , first_recordable_frame (max_framepos)
+        , last_recordable_frame (max_framepos)
+        , last_possibly_recording (0)
+        , _alignment_style (ExistingMaterial)
+        , _alignment_choice (Automatic)
+        , _scrubbing (false)
+        , _slaved (false)
+        , loop_location (0)
+        , overwrite_frame (0)
+        , overwrite_offset (0)
+        , _pending_overwrite (false)
+        , overwrite_queued (false)
+        , wrap_buffer_size (0)
+        , speed_buffer_size (0)
+        , _speed (1.0)
+        , _target_speed (_speed)
+        , file_frame (0)
+        , playback_sample (0)
+        , playback_distance (0)
+        , _read_data_count (0)
+        , _write_data_count (0)
+        , in_set_state (false)
+        , _flags (Recordable)
+        , deprecated_io_node (0)
 {
-       _flags = f;
-       _io = 0;
-       _alignment_style = ExistingMaterial;
-       _persistent_alignment_style = ExistingMaterial;
-       first_input_change = true;
-       i_am_the_modifier = 0;
-       g_atomic_int_set (&_record_enabled, 0);
-       was_recording = false;
-       capture_start_frame = 0;
-       capture_captured = 0;
-       _visible_speed = 1.0f;
-       _actual_speed = 1.0f;
-       _buffer_reallocation_required = false;
-       _seek_required = false;
-       first_recordable_frame = max_frames;
-       last_recordable_frame = max_frames;
-       _roll_delay = 0;
-       _capture_offset = 0;
-       _processed = false;
-       _slaved = false;
-       adjust_capture_position = 0;
-       last_possibly_recording = 0;
-       loop_location = 0;
-       wrap_buffer_size = 0;
-       speed_buffer_size = 0;
-       last_phase = 0;
-       phi = (uint64_t) (0x1000000);
-       file_frame = 0;
-       playback_sample = 0;
-       playback_distance = 0;
-       _read_data_count = 0;
-       _write_data_count = 0;
-
-       pending_overwrite = false;
-       overwrite_frame = 0;
-       overwrite_queued = false;
-       input_change_pending = NoChange;
-
-       _n_channels = 0;
 }
 
 Diskstream::~Diskstream ()
 {
-       // Taken by derived class destrctors.. should assure locked here somehow?
-       //Glib::Mutex::Lock lm (state_lock);
+       DEBUG_TRACE (DEBUG::Destruction, string_compose ("Diskstream %1 deleted\n", _name));
 
-       if (_playlist)
+       if (_playlist) {
                _playlist->release ();
+       }
+
+        delete deprecated_io_node;
 }
 
 void
-Diskstream::set_io (IO& io)
+Diskstream::set_track (Track* t)
 {
-       _io = &io;
-       set_align_style_from_io ();
+       _track = t;
+       _io = _track->input();
+
+       ic_connection.disconnect();
+       _io->changed.connect_same_thread (ic_connection, boost::bind (&Diskstream::handle_input_change, this, _1, _2));
+
+        if (_io->n_ports() != ChanCount::ZERO) {
+                input_change_pending.type = IOChange::Type (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged);
+                non_realtime_input_change ();
+        }
+
+       _track->Destroyed.connect_same_thread (*this, boost::bind (&Diskstream::route_going_away, this));
 }
 
 void
-Diskstream::handle_input_change (IOChange change, void *src)
+Diskstream::handle_input_change (IOChange change, void * /*src*/)
 {
        Glib::Mutex::Lock lm (state_lock);
 
-       if (!(input_change_pending & change)) {
-               input_change_pending = IOChange (input_change_pending|change);
-               _session.request_input_change_handling ();
-       }
+        if (change.type & (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged)) {
+
+                /* rather than handle this here on a DS-by-DS basis we defer to the
+                   session transport/butler thread, and let it tackle
+                   as many diskstreams as need it in one shot. this avoids many repeated
+                   takings of the audioengine process lock.
+                */
+
+                if (!(input_change_pending.type & change.type)) {
+                        input_change_pending.type = IOChange::Type (input_change_pending.type | change.type);
+                        _session.request_input_change_handling ();
+                }
+        }
 }
 
 void
@@ -163,7 +222,7 @@ Diskstream::non_realtime_set_speed ()
 
        if (_seek_required) {
                if (speed() != 1.0f || speed() != -1.0f) {
-                       seek ((nframes_t) (_session.transport_frame() * (double) speed()), true);
+                       seek ((framepos_t) (_session.transport_frame() * (double) speed()), true);
                }
                else {
                        seek (_session.transport_frame(), true);
@@ -178,23 +237,23 @@ Diskstream::realtime_set_speed (double sp, bool global)
 {
        bool changed = false;
        double new_speed = sp * _session.transport_speed();
-       
+
        if (_visible_speed != sp) {
                _visible_speed = sp;
                changed = true;
        }
-       
+
        if (new_speed != _actual_speed) {
-               
-               nframes_t required_wrap_size = (nframes_t) floor (_session.get_block_size() * 
-                                                                           fabs (new_speed)) + 1;
-               
+
+               framecnt_t required_wrap_size = (framecnt_t) floor (_session.get_block_size() *
+                                                                  fabs (new_speed)) + 1;
+
                if (required_wrap_size > wrap_buffer_size) {
                        _buffer_reallocation_required = true;
                }
-               
+
                _actual_speed = new_speed;
-               phi = (uint64_t) (0x1000000 * fabs(_actual_speed));
+               _target_speed = fabs(_actual_speed);
        }
 
        if (changed) {
@@ -207,20 +266,6 @@ Diskstream::realtime_set_speed (double sp, bool global)
        return _buffer_reallocation_required || _seek_required;
 }
 
-void
-Diskstream::prepare ()
-{
-       _processed = false;
-       playback_distance = 0;
-}
-
-void
-Diskstream::recover ()
-{
-       state_lock.unlock();
-       _processed = false;
-}
-
 void
 Diskstream::set_capture_offset ()
 {
@@ -229,22 +274,48 @@ Diskstream::set_capture_offset ()
                return;
        }
 
-       _capture_offset = _io->input_latency();
+       _capture_offset = _io->latency();
+        DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: using IO latency, capture offset set to %2\n", name(), _capture_offset));
 }
 
+
 void
-Diskstream::set_align_style (AlignStyle a)
+Diskstream::set_align_style (AlignStyle a, bool force)
 {
        if (record_enabled() && _session.actively_recording()) {
                return;
        }
 
-       if (a != _alignment_style) {
+       if ((a != _alignment_style) || force) {
                _alignment_style = a;
                AlignmentStyleChanged ();
        }
 }
 
+void
+Diskstream::set_align_choice (AlignChoice a, bool force)
+{
+       if (record_enabled() && _session.actively_recording()) {
+               return;
+       }
+
+       if ((a != _alignment_choice) || force) {
+               _alignment_choice = a;
+
+                switch (_alignment_choice) {
+                case Automatic:
+                        set_align_style_from_io ();
+                        break;
+                case UseExistingMaterial:
+                        set_align_style (ExistingMaterial);
+                        break;
+                case UseCaptureTime:
+                        set_align_style (CaptureTime);
+                        break;
+                }
+       }
+}
+
 int
 Diskstream::set_loop (Location *location)
 {
@@ -257,54 +328,54 @@ Diskstream::set_loop (Location *location)
 
        loop_location = location;
 
-        LoopSet (location); /* EMIT SIGNAL */
+       LoopSet (location); /* EMIT SIGNAL */
        return 0;
 }
 
-nframes_t
-Diskstream::get_capture_start_frame (uint32_t n)
+/** Get the start position (in session frames) of the nth capture in the current pass */
+ARDOUR::framepos_t
+Diskstream::get_capture_start_frame (uint32_t n) const
 {
        Glib::Mutex::Lock lm (capture_info_lock);
 
        if (capture_info.size() > n) {
+               /* this is a completed capture */
                return capture_info[n]->start;
-       }
-       else {
+       } else {
+               /* this is the currently in-progress capture */
                return capture_start_frame;
        }
 }
 
-nframes_t
-Diskstream::get_captured_frames (uint32_t n)
+ARDOUR::framecnt_t
+Diskstream::get_captured_frames (uint32_t n) const
 {
        Glib::Mutex::Lock lm (capture_info_lock);
 
        if (capture_info.size() > n) {
+               /* this is a completed capture */
                return capture_info[n]->frames;
-       }
-       else {
+       } else {
+               /* this is the currently in-progress capture */
                return capture_captured;
        }
 }
 
 void
-Diskstream::set_roll_delay (nframes_t nframes)
+Diskstream::set_roll_delay (ARDOUR::framecnt_t nframes)
 {
        _roll_delay = nframes;
 }
 
-void
-Diskstream::set_speed (double sp)
-{
-       _session.request_diskstream_speed (*this, sp);
-
-       /* to force a rebuffering at the right place */
-       playlist_modified();
-}
-
 int
 Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 {
+        if (!playlist) {
+                return 0;
+        }
+
+        bool prior_playlist = false;
+
        {
                Glib::Mutex::Lock lm (state_lock);
 
@@ -312,22 +383,23 @@ Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
                        return 0;
                }
 
-               plmod_connection.disconnect ();
-               plgone_connection.disconnect ();
+               playlist_connections.drop_connections ();
 
                if (_playlist) {
                        _playlist->release();
+                        prior_playlist = true;
                }
-                       
+
                _playlist = playlist;
                _playlist->use();
 
                if (!in_set_state && recordable()) {
                        reset_write_sources (false);
                }
-               
-               plmod_connection = _playlist->Modified.connect (mem_fun (*this, &Diskstream::playlist_modified));
-               plgone_connection = _playlist->GoingAway.connect (bind (mem_fun (*this, &Diskstream::playlist_deleted), boost::weak_ptr<Playlist>(_playlist)));
+
+               _playlist->ContentsChanged.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_modified, this));
+               _playlist->DropReferences.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_deleted, this, boost::weak_ptr<Playlist>(_playlist)));
+               _playlist->RangesMoved.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_ranges_moved, this, _1, _2));
        }
 
        /* don't do this if we've already asked for it *or* if we are setting up
@@ -335,11 +407,11 @@ Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
           take care of the buffer refill.
        */
 
-       if (!overwrite_queued && !(_session.state_of_the_state() & Session::CannotSave)) {
-               _session.request_overwrite_buffer (this);
+       if (!overwrite_queued && prior_playlist) {
+               _session.request_overwrite_buffer (_track);
                overwrite_queued = true;
        }
-       
+
        PlaylistChanged (); /* EMIT SIGNAL */
        _session.set_dirty ();
 
@@ -347,7 +419,7 @@ Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 }
 
 void
-Diskstream::playlist_changed (Change ignored)
+Diskstream::playlist_changed (const PropertyChange&)
 {
        playlist_modified ();
 }
@@ -356,9 +428,9 @@ void
 Diskstream::playlist_modified ()
 {
        if (!i_am_the_modifier && !overwrite_queued) {
-               _session.request_overwrite_buffer (this);
+               _session.request_overwrite_buffer (_track);
                overwrite_queued = true;
-       } 
+       }
 }
 
 void
@@ -368,45 +440,323 @@ Diskstream::playlist_deleted (boost::weak_ptr<Playlist> wpl)
 
        if (pl == _playlist) {
 
-               /* this catches an ordering issue with session destruction. playlists 
+               /* this catches an ordering issue with session destruction. playlists
                   are destroyed before diskstreams. we have to invalidate any handles
                   we have to the playlist.
                */
-               
+
                if (_playlist) {
                        _playlist.reset ();
-               } 
+               }
        }
 }
 
-int
-Diskstream::set_name (string str)
+bool
+Diskstream::set_name (const string& str)
 {
-       if (str != _name) {
+       if (_name != str) {
                assert(playlist());
                playlist()->set_name (str);
-               _name = str;
-               
-               if (!in_set_state && recordable()) {
-                       /* rename existing capture files so that they have the correct name */
-                       return rename_write_sources ();
-               } else {
+               SessionObject::set_name(str);
+       }
+        return true;
+}
+
+XMLNode&
+Diskstream::get_state ()
+{
+       XMLNode* node = new XMLNode ("Diskstream");
+        char buf[64];
+       LocaleGuard lg (X_("POSIX"));
+
+       node->add_property ("flags", enum_2_string (_flags));
+       node->add_property ("playlist", _playlist->name());
+       node->add_property("name", _name);
+       id().print (buf, sizeof (buf));
+       node->add_property("id", buf);
+       snprintf (buf, sizeof(buf), "%f", _visible_speed);
+       node->add_property ("speed", buf);
+        node->add_property ("capture-alignment", enum_2_string (_alignment_choice));
+
+       if (_extra_xml) {
+               node->add_child_copy (*_extra_xml);
+       }
+
+        return *node;
+}
+
+int
+Diskstream::set_state (const XMLNode& node, int /*version*/)
+{
+       const XMLProperty* prop;
+
+       if ((prop = node.property ("name")) != 0) {
+               _name = prop->value();
+       }
+
+       if (deprecated_io_node) {
+               if ((prop = deprecated_io_node->property ("id")) != 0) {
+                       _id = prop->value ();
+               }
+       } else {
+               if ((prop = node.property ("id")) != 0) {
+                       _id = prop->value ();
+               }
+       }
+
+       if ((prop = node.property ("flags")) != 0) {
+               _flags = Flag (string_2_enum (prop->value(), _flags));
+       }
+
+        if ((prop = node.property (X_("capture-alignment"))) != 0) {
+                set_align_choice (AlignChoice (string_2_enum (prop->value(), _alignment_choice)), true);
+        } else {
+                set_align_choice (Automatic, true);
+        }
+
+       if ((prop = node.property ("playlist")) == 0) {
+               return -1;
+       }
+
+       {
+               bool had_playlist = (_playlist != 0);
+
+               if (find_and_use_playlist (prop->value())) {
                        return -1;
                }
+
+               if (!had_playlist) {
+                       _playlist->set_orig_diskstream_id (id());
+               }
        }
 
-       return 0;
+       if ((prop = node.property ("speed")) != 0) {
+               double sp = atof (prop->value().c_str());
+
+               if (realtime_set_speed (sp, false)) {
+                       non_realtime_set_speed ();
+               }
+       }
+
+        return 0;
 }
 
 void
-Diskstream::remove_region_from_last_capture (boost::weak_ptr<Region> wregion)
+Diskstream::playlist_ranges_moved (list< Evoral::RangeMove<framepos_t> > const & movements_frames, bool from_undo)
 {
-       boost::shared_ptr<Region> region (wregion.lock());
+       /* If we're coming from an undo, it will have handled
+          automation undo (it must, since automation-follows-regions
+          can lose automation data).  Hence we can do nothing here.
+       */
+
+       if (from_undo) {
+               return;
+       }
+
+       if (!_track || Config->get_automation_follows_regions () == false) {
+               return;
+       }
+
+       list< Evoral::RangeMove<double> > movements;
+
+       for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin();
+            i != movements_frames.end();
+            ++i) {
+
+               movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
+       }
 
-       if (!region) {
+       /* move panner automation */
+       boost::shared_ptr<Pannable> pannable = _track->pannable();
+        Evoral::ControlSet::Controls& c (pannable->controls());
+
+        for (Evoral::ControlSet::Controls::iterator ci = c.begin(); ci != c.end(); ++ci) {
+                boost::shared_ptr<AutomationControl> ac = boost::dynamic_pointer_cast<AutomationControl>(ci->second);
+                if (!ac) {
+                        continue;
+                }
+                boost::shared_ptr<AutomationList> alist = ac->alist();
+
+                XMLNode & before = alist->get_state ();
+                bool const things_moved = alist->move_ranges (movements);
+                if (things_moved) {
+                        _session.add_command (new MementoCommand<AutomationList> (
+                                                      *alist.get(), &before, &alist->get_state ()));
+                }
+        }
+
+       /* move processor automation */
+       _track->foreach_processor (boost::bind (&Diskstream::move_processor_automation, this, _1, movements_frames));
+}
+
+void
+Diskstream::move_processor_automation (boost::weak_ptr<Processor> p, list< Evoral::RangeMove<framepos_t> > const & movements_frames)
+{
+       boost::shared_ptr<Processor> processor (p.lock ());
+       if (!processor) {
                return;
        }
-       
-       _last_capture_regions.remove (region);
+
+       list< Evoral::RangeMove<double> > movements;
+       for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin(); i != movements_frames.end(); ++i) {
+               movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
+       }
+
+       set<Evoral::Parameter> const a = processor->what_can_be_automated ();
+
+       for (set<Evoral::Parameter>::iterator i = a.begin (); i != a.end (); ++i) {
+               boost::shared_ptr<AutomationList> al = processor->automation_control(*i)->alist();
+               XMLNode & before = al->get_state ();
+               bool const things_moved = al->move_ranges (movements);
+               if (things_moved) {
+                       _session.add_command (
+                               new MementoCommand<AutomationList> (
+                                       *al.get(), &before, &al->get_state ()
+                                       )
+                               );
+               }
+       }
 }
 
+void
+Diskstream::check_record_status (framepos_t transport_frame, bool can_record)
+{
+       int possibly_recording;
+       int rolling;
+       int change;
+       const int transport_rolling = 0x4;
+       const int track_rec_enabled = 0x2;
+       const int global_rec_enabled = 0x1;
+        const int fully_rec_enabled = (transport_rolling|track_rec_enabled|global_rec_enabled);
+
+       /* merge together the 3 factors that affect record status, and compute
+          what has changed.
+       */
+
+       rolling = _session.transport_speed() != 0.0f;
+       possibly_recording = (rolling << 2) | (record_enabled() << 1) | can_record;
+       change = possibly_recording ^ last_possibly_recording;
+
+       if (possibly_recording == last_possibly_recording) {
+               return;
+       }
+
+        framecnt_t existing_material_offset = _session.worst_playback_latency();
+
+        if (possibly_recording == fully_rec_enabled) {
+
+                if (last_possibly_recording == fully_rec_enabled) {
+                        return;
+                }
+
+               capture_start_frame = _session.transport_frame();
+               first_recordable_frame = capture_start_frame + _capture_offset;
+               last_recordable_frame = max_framepos;
+
+                DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: @ %7 (%9) FRF = %2 CSF = %4 CO = %5, EMO = %6 RD = %8 WOL %10 WTL %11\n",
+                                                                      name(), first_recordable_frame, last_recordable_frame, capture_start_frame,
+                                                                      _capture_offset,
+                                                                      existing_material_offset,
+                                                                      transport_frame,
+                                                                      _roll_delay,
+                                                                      _session.transport_frame(),
+                                                                      _session.worst_output_latency(),
+                                                                      _session.worst_track_latency()));
+
+
+                if (_alignment_style == ExistingMaterial) {
+                        first_recordable_frame += existing_material_offset;
+                        DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("\tshift FRF by EMO %1\n",
+                                                                              first_recordable_frame));
+                }
+
+                prepare_record_status (capture_start_frame);
+
+        } else {
+
+                if (last_possibly_recording == fully_rec_enabled) {
+
+                        /* we were recording last time */
+
+                        if (change & transport_rolling) {
+
+                                /* transport-change (stopped rolling): last_recordable_frame was set in ::prepare_to_stop(). We
+                                   had to set it there because we likely rolled past the stopping point to declick out,
+                                   and then backed up.
+                                 */
+
+                        } else {
+                                /* punch out */
+
+                                last_recordable_frame = _session.transport_frame() + _capture_offset;
+
+                                if (_alignment_style == ExistingMaterial) {
+                                        last_recordable_frame += existing_material_offset;
+                                }
+                        }
+                }
+        }
+
+       last_possibly_recording = possibly_recording;
+}
+
+void
+Diskstream::route_going_away ()
+{
+       _io.reset ();
+}
+
+void
+Diskstream::calculate_record_range(OverlapType ot, framepos_t transport_frame, framecnt_t nframes,
+                                  framecnt_t & rec_nframes, framecnt_t & rec_offset)
+{
+       switch (ot) {
+       case OverlapNone:
+               rec_nframes = 0;
+               break;
+
+       case OverlapInternal:
+               /*     ----------    recrange
+                        |---|       transrange
+               */
+               rec_nframes = nframes;
+               rec_offset = 0;
+               break;
+
+       case OverlapStart:
+               /*    |--------|    recrange
+               -----|          transrange
+               */
+               rec_nframes = transport_frame + nframes - first_recordable_frame;
+               if (rec_nframes) {
+                       rec_offset = first_recordable_frame - transport_frame;
+               }
+               break;
+
+       case OverlapEnd:
+               /*    |--------|    recrange
+                        |--------  transrange
+               */
+               rec_nframes = last_recordable_frame - transport_frame;
+               rec_offset = 0;
+               break;
+
+       case OverlapExternal:
+               /*    |--------|    recrange
+                   --------------  transrange
+               */
+               rec_nframes = last_recordable_frame - first_recordable_frame;
+               rec_offset = first_recordable_frame - transport_frame;
+               break;
+       }
+
+        DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1 rec? %2 @ %3 (for %4) FRF %5 LRF %6 : rf %7 @ %8\n",
+                                                              _name, enum_2_string (ot), transport_frame, nframes,
+                                                              first_recordable_frame, last_recordable_frame, rec_nframes, rec_offset));
+}
+
+void
+Diskstream::prepare_to_stop (framepos_t pos)
+{
+        last_recordable_frame = pos + _capture_offset;
+}