Paste uses exact beats. rework _start_beats calculation in copy-with-offset ctor.
[ardour.git] / libs / ardour / audio_track.cc
index 2c38e37dee808b138133c4ea19620046f45230c9..8c56f90afbe1d52c9c3903efd29715f3a37d648f 100644 (file)
 
 */
 
-#include <sigc++/retype.h>
-#include <sigc++/retype_return.h>
-#include <sigc++/bind.h>
+#include <boost/scoped_array.hpp>
 
-#include "pbd/error.h"
 #include "pbd/enumwriter.h"
+#include "pbd/error.h"
 
 #include "evoral/Curve.hpp"
 
 #include "ardour/audio_diskstream.h"
 #include "ardour/audio_track.h"
 #include "ardour/audioplaylist.h"
-#include "ardour/audioregion.h"
-#include "ardour/audiosource.h"
+#include "ardour/boost_debug.h"
 #include "ardour/buffer_set.h"
-#include "ardour/io_processor.h"
-#include "ardour/panner.h"
+#include "ardour/delivery.h"
 #include "ardour/meter.h"
+#include "ardour/monitor_control.h"
 #include "ardour/playlist_factory.h"
-#include "ardour/plugin_insert.h"
 #include "ardour/processor.h"
+#include "ardour/profile.h"
+#include "ardour/region.h"
 #include "ardour/region_factory.h"
-#include "ardour/route_group_specialized.h"
 #include "ardour/session.h"
+#include "ardour/session_playlists.h"
+#include "ardour/source.h"
 #include "ardour/utils.h"
+
 #include "i18n.h"
 
 using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-AudioTrack::AudioTrack (Session& sess, string name, Route::Flag flag, TrackMode mode)
-       : Track (sess, name, flag, mode)
+AudioTrack::AudioTrack (Session& sess, string name, TrackMode mode)
+       : Track (sess, name, PresentationInfo::AudioTrack, mode)
 {
-       use_new_diskstream ();
 }
 
-AudioTrack::AudioTrack (Session& sess, const XMLNode& node, int /*version*/)
-       : Track (sess, node)
+AudioTrack::~AudioTrack ()
 {
-       _set_state (node, Stateful::loading_state_version, false);
+       if (_freeze_record.playlist && !_session.deletion_in_progress()) {
+               _freeze_record.playlist->release();
+       }
 }
 
-AudioTrack::~AudioTrack ()
+boost::shared_ptr<Diskstream>
+AudioTrack::create_diskstream ()
 {
+       AudioDiskstream::Flag dflags = AudioDiskstream::Flag (AudioDiskstream::Recordable);
+
+       if (_mode == Destructive && !Profile->get_trx()) {
+               dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Destructive);
+       } else if (_mode == NonLayered){
+               dflags = AudioDiskstream::Flag(dflags | AudioDiskstream::NonLayered);
+       }
+
+       return boost::shared_ptr<AudioDiskstream> (new AudioDiskstream (_session, name(), dflags));
 }
 
 void
-AudioTrack::use_new_diskstream ()
+AudioTrack::set_diskstream (boost::shared_ptr<Diskstream> ds)
 {
-       AudioDiskstream::Flag dflags = AudioDiskstream::Flag (0);
+       Track::set_diskstream (ds);
 
-       if (_flags & Hidden) {
-               dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Hidden);
+       _diskstream->set_track (this);
+       if (Profile->get_trx()) {
+               _diskstream->set_destructive (false);
        } else {
-               dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Recordable);
+               _diskstream->set_destructive (_mode == Destructive);
        }
+       _diskstream->set_non_layered (_mode == NonLayered);
 
-       if (_mode == Destructive) {
-               dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Destructive);
-       } else if (_mode == NonLayered){
-               dflags = AudioDiskstream::Flag(dflags | AudioDiskstream::NonLayered);
-       }
+       if (audio_diskstream()->deprecated_io_node) {
 
+               if (!IO::connecting_legal) {
+                       IO::ConnectingLegal.connect_same_thread (*this, boost::bind (&AudioTrack::deprecated_use_diskstream_connections, this));
+               } else {
+                       deprecated_use_diskstream_connections ();
+               }
+       }
 
-       boost::shared_ptr<AudioDiskstream> ds (new AudioDiskstream (_session, name(), dflags));
+       _diskstream->set_record_enabled (false);
+       _diskstream->request_input_monitoring (false);
 
-       _session.add_diskstream (ds);
+       DiskstreamChanged (); /* EMIT SIGNAL */
+}
 
-       set_diskstream (boost::dynamic_pointer_cast<AudioDiskstream> (ds), this);
+boost::shared_ptr<AudioDiskstream>
+AudioTrack::audio_diskstream() const
+{
+       return boost::dynamic_pointer_cast<AudioDiskstream>(_diskstream);
 }
 
 int
@@ -96,7 +115,7 @@ AudioTrack::set_mode (TrackMode m)
 {
        if (m != _mode) {
 
-               if (_diskstream->set_destructive (m == Destructive)) {
+               if (!Profile->get_trx() && _diskstream->set_destructive (m == Destructive)) {
                        return -1;
                }
 
@@ -119,8 +138,15 @@ AudioTrack::can_use_mode (TrackMode m, bool& bounce_required)
                return true;
 
        case Destructive:
+               if (Profile->get_trx()) {
+                       return false;
+               } else {
+                       return _diskstream->can_become_destructive (bounce_required);
+               }
+               break;
+
        default:
-               return _diskstream->can_become_destructive (bounce_required);
+               return false;
        }
 }
 
@@ -133,7 +159,7 @@ AudioTrack::deprecated_use_diskstream_connections ()
                return 0;
        }
 
-       const XMLProperty* prop;
+       XMLProperty const * prop;
        XMLNode& node (*diskstream->deprecated_io_node);
 
        /* don't do this more than once. */
@@ -141,7 +167,7 @@ AudioTrack::deprecated_use_diskstream_connections ()
        diskstream->deprecated_io_node = 0;
 
        if ((prop = node.property ("gain")) != 0) {
-               _amp->set_gain (atof (prop->value().c_str()), this);
+               _amp->gain_control()->set_value (atof (prop->value().c_str()), PBD::Controllable::NoGroup);
        }
 
        if ((prop = node.property ("input-connection")) != 0) {
@@ -160,7 +186,7 @@ AudioTrack::deprecated_use_diskstream_connections ()
                        }
                }
 
-               _input->connect_ports_to_bundle (c, this);
+               _input->connect_ports_to_bundle (c, true, this);
 
        } else if ((prop = node.property ("inputs")) != 0) {
                if (_input->set_ports (prop->value())) {
@@ -172,83 +198,10 @@ AudioTrack::deprecated_use_diskstream_connections ()
        return 0;
 }
 
-int
-AudioTrack::set_diskstream (boost::shared_ptr<AudioDiskstream> ds, void * /*src*/)
-{
-       _diskstream = ds;
-       _diskstream->set_route (*this);
-       _diskstream->set_destructive (_mode == Destructive);
-       _diskstream->set_non_layered (_mode == NonLayered);
-
-       if (audio_diskstream()->deprecated_io_node) {
-
-               if (!IO::connecting_legal) {
-                       IO::ConnectingLegal.connect (mem_fun (*this, &AudioTrack::deprecated_use_diskstream_connections));
-               } else {
-                       deprecated_use_diskstream_connections ();
-               }
-       }
-
-       _diskstream->set_record_enabled (false);
-       _diskstream->monitor_input (false);
-
-       ic_connection.disconnect();
-       ic_connection = _input->changed.connect (mem_fun (*_diskstream, &Diskstream::handle_input_change));
-
-       DiskstreamChanged (); /* EMIT SIGNAL */
-
-       return 0;
-}
-
-int
-AudioTrack::use_diskstream (string name)
-{
-       boost::shared_ptr<AudioDiskstream> dstream;
-
-       if ((dstream = boost::dynamic_pointer_cast<AudioDiskstream>(_session.diskstream_by_name (name))) == 0) {
-               error << string_compose(_("AudioTrack: audio diskstream \"%1\" not known by session"), name) << endmsg;
-               return -1;
-       }
-
-       return set_diskstream (dstream, this);
-}
-
-int
-AudioTrack::use_diskstream (const PBD::ID& id)
-{
-       boost::shared_ptr<AudioDiskstream> dstream;
-
-       if ((dstream = boost::dynamic_pointer_cast<AudioDiskstream> (_session.diskstream_by_id (id))) == 0) {
-               error << string_compose(_("AudioTrack: audio diskstream \"%1\" not known by session"), id) << endmsg;
-               return -1;
-       }
-
-       return set_diskstream (dstream, this);
-}
-
-boost::shared_ptr<AudioDiskstream>
-AudioTrack::audio_diskstream() const
-{
-       return boost::dynamic_pointer_cast<AudioDiskstream>(_diskstream);
-}
-
 int
 AudioTrack::set_state (const XMLNode& node, int version)
 {
-       return _set_state (node, version, true);
-}
-
-int
-AudioTrack::_set_state (const XMLNode& node, int version, bool call_base)
-{
-       const XMLProperty *prop;
-       XMLNodeConstIterator iter;
-
-       if (call_base) {
-               if (Route::_set_state (node, version, call_base)) {
-                       return -1;
-               }
-       }
+       XMLProperty const * prop;
 
        if ((prop = node.property (X_("mode"))) != 0) {
                _mode = TrackMode (string_2_enum (prop->value(), _mode));
@@ -256,59 +209,22 @@ AudioTrack::_set_state (const XMLNode& node, int version, bool call_base)
                _mode = Normal;
        }
 
-       if ((prop = node.property ("diskstream-id")) == 0) {
-
-               /* some old sessions use the diskstream name rather than the ID */
-
-               if ((prop = node.property ("diskstream")) == 0) {
-                       fatal << _("programming error: AudioTrack given state without diskstream!") << endmsg;
-                       /*NOTREACHED*/
-                       return -1;
-               }
-
-               if (use_diskstream (prop->value())) {
-                       return -1;
-               }
-
-       } else {
-
-               PBD::ID id (prop->value());
-               PBD::ID zero ("0");
-
-               /* this wierd hack is used when creating tracks from a template. there isn't
-                  a particularly good time to interpose between setting the first part of
-                  the track state (notably Route::set_state() and the track mode), and the
-                  second part (diskstream stuff). So, we have a special ID for the diskstream
-                  that means "you should create a new diskstream here, not look for
-                  an old one.
+       if (Profile->get_trx() && _mode == Destructive) {
+               /* Tracks does not support destructive tracks and trying to
+                  handle it as a normal track would be wrong.
                */
-
-               if (id == zero) {
-                       use_new_diskstream ();
-               } else if (use_diskstream (id)) {
-                       return -1;
-               }
+               error << string_compose (_("%1: this session uses destructive tracks, which are not supported"), PROGRAM_NAME) << endmsg;
+               return -1;
        }
 
-
-       XMLNodeList nlist;
-       XMLNodeConstIterator niter;
-       XMLNode *child;
-
-       nlist = node.children();
-       for (niter = nlist.begin(); niter != nlist.end(); ++niter){
-               child = *niter;
-
-               if (child->name() == X_("recenable")) {
-                       _rec_enable_control->set_state (*child, version);
-                       _session.add_controllable (_rec_enable_control);
-               }
+       if (Track::set_state (node, version)) {
+               return -1;
        }
 
        pending_state = const_cast<XMLNode*> (&node);
 
        if (_session.state_of_the_state() & Session::Loading) {
-               _session.StateReady.connect (mem_fun (*this, &AudioTrack::set_state_part_two));
+               _session.StateReady.connect_same_thread (*this, boost::bind (&AudioTrack::set_state_part_two, this));
        } else {
                set_state_part_two ();
        }
@@ -317,9 +233,9 @@ AudioTrack::_set_state (const XMLNode& node, int version, bool call_base)
 }
 
 XMLNode&
-AudioTrack::state(bool full_state)
+AudioTrack::state (bool full_state)
 {
-       XMLNode& root (Route::state(full_state));
+       XMLNode& root (Track::state(full_state));
        XMLNode* freeze_node;
        char buf[64];
 
@@ -342,26 +258,8 @@ AudioTrack::state(bool full_state)
                root.add_child_nocopy (*freeze_node);
        }
 
-       /* Alignment: act as a proxy for the diskstream */
-
-       XMLNode* align_node = new XMLNode (X_("Alignment"));
-       AlignStyle as = _diskstream->alignment_style ();
-       align_node->add_property (X_("style"), enum_2_string (as));
-       root.add_child_nocopy (*align_node);
-
        root.add_property (X_("mode"), enum_2_string (_mode));
 
-       /* we don't return diskstream state because we don't
-          own the diskstream exclusively. control of the diskstream
-          state is ceded to the Session, even if we create the
-          diskstream.
-       */
-
-       _diskstream->id().print (buf, sizeof (buf));
-       root.add_property ("diskstream-id", buf);
-
-       root.add_child_nocopy (_rec_enable_control->get_state());
-
        return root;
 }
 
@@ -369,8 +267,8 @@ void
 AudioTrack::set_state_part_two ()
 {
        XMLNode* fnode;
-       XMLProperty* prop;
-       LocaleGuard lg (X_("POSIX"));
+       XMLProperty const * prop;
+       LocaleGuard lg;
 
        /* This is called after all session state has been restored but before
           have been made ports and connections are established.
@@ -390,9 +288,10 @@ AudioTrack::set_state_part_two ()
                _freeze_record.processor_info.clear ();
 
                if ((prop = fnode->property (X_("playlist"))) != 0) {
-                       boost::shared_ptr<Playlist> pl = _session.playlist_by_name (prop->value());
+                       boost::shared_ptr<Playlist> pl = _session.playlists->by_name (prop->value());
                        if (pl) {
                                _freeze_record.playlist = boost::dynamic_pointer_cast<AudioPlaylist> (pl);
+                               _freeze_record.playlist->use();
                        } else {
                                _freeze_record.playlist.reset ();
                                _freeze_record.state = NoFreeze;
@@ -422,51 +321,28 @@ AudioTrack::set_state_part_two ()
                        _freeze_record.processor_info.push_back (frii);
                }
        }
-
-       /* Alignment: act as a proxy for the diskstream */
-
-       if ((fnode = find_named_node (*pending_state, X_("Alignment"))) != 0) {
-
-               if ((prop = fnode->property (X_("style"))) != 0) {
-
-                       /* fix for older sessions from before EnumWriter */
-
-                       string pstr;
-
-                       if (prop->value() == "capture") {
-                               pstr = "CaptureTime";
-                       } else if (prop->value() == "existing") {
-                               pstr = "ExistingMaterial";
-                       } else {
-                               pstr = prop->value();
-                       }
-
-                       AlignStyle as = AlignStyle (string_2_enum (pstr, as));
-                       _diskstream->set_persistent_align_style (as);
-               }
-       }
-       return;
 }
 
+/** @param need_butler to be set to true if this track now needs the butler, otherwise it can be left alone
+ *  or set to false.
+ */
 int
-AudioTrack::roll (nframes_t nframes, sframes_t start_frame, sframes_t end_frame, int declick,
-                 bool can_record, bool rec_monitors_input)
+AudioTrack::roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, int declick, bool& need_butler)
 {
-       int dret;
-       Sample* b;
-       Sample* tmpb;
-       nframes_t transport_frame;
-       boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
-
-       {
-               Glib::RWLock::ReaderLock lm (_processor_lock, Glib::TRY_LOCK);
-               if (lm.locked()) {
-                       // automation snapshot can also be called from the non-rt context
-                       // and it uses the redirect list, so we take the lock out here
-                       automation_snapshot (start_frame, false);
+       Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
+
+       if (!lm.locked()) {
+               boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
+               framecnt_t playback_distance = diskstream->calculate_playback_distance(nframes);
+               if (can_internal_playback_seek(::llabs(playback_distance))) {
+                       /* TODO should declick */
+                       internal_playback_seek(playback_distance);
                }
+               return 0;
        }
 
+       framepos_t transport_frame;
+       boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
 
        if (n_outputs().n_total() == 0 && _processors.empty()) {
                return 0;
@@ -474,229 +350,176 @@ AudioTrack::roll (nframes_t nframes, sframes_t start_frame, sframes_t end_frame,
 
        if (!_active) {
                silence (nframes);
+               if (_meter_point == MeterInput && ((_monitoring_control->monitoring_choice() & MonitorInput) || _diskstream->record_enabled())) {
+                       _meter->reset();
+               }
                return 0;
        }
 
        transport_frame = _session.transport_frame();
 
+       int dret;
+       framecnt_t playback_distance;
+
        if ((nframes = check_initial_delay (nframes, transport_frame)) == 0) {
 
                /* need to do this so that the diskstream sets its
                   playback distance to zero, thus causing diskstream::commit
                   to do nothing.
                */
-               return diskstream->process (transport_frame, 0, can_record, rec_monitors_input);
-       }
 
-       _silent = false;
-       _amp->apply_gain_automation(false);
+               BufferSet bufs; /* empty set, no matter - nothing will happen */
 
-       if ((dret = diskstream->process (transport_frame, nframes, can_record, rec_monitors_input)) != 0) {
-               silence (nframes);
+               dret = diskstream->process (bufs, transport_frame, 0, playback_distance, false);
+               need_butler = diskstream->commit (playback_distance);
                return dret;
        }
 
-       /* special condition applies */
-
-       if (_meter_point == MeterInput) {
-               _input->process_input (_meter, start_frame, end_frame, nframes);
-       }
-
-       if (diskstream->record_enabled() && !can_record && !_session.config.get_auto_input()) {
-
-               /* not actually recording, but we want to hear the input material anyway,
-                  at least potentially (depending on monitoring options)
-                */
-
-               passthru (start_frame, end_frame, nframes, false);
-
-       } else if ((b = diskstream->playback_buffer(0)) != 0) {
-
-               /*
-                 XXX is it true that the earlier test on n_outputs()
-                 means that we can avoid checking it again here? i think
-                 so, because changing the i/o configuration of an IO
-                 requires holding the AudioEngine lock, which we hold
-                 while in the process() tree.
-               */
-
-
-               /* copy the diskstream data to all output buffers */
-
-               size_t limit = n_process_buffers().n_audio();
-               BufferSet& bufs = _session.get_scratch_buffers ();
-               const size_t blimit = bufs.count().n_audio();
-
-               uint32_t n;
-               uint32_t i;
-
-               if (limit > blimit) {
-
-                       /* example case: auditioner configured for stereo output,
-                          but loaded with an 8 channel file. there are only
-                          2 passthrough buffers, but n_process_buffers() will
-                          return 8.
-
-                          arbitrary decision: map all channels in the diskstream
-                          to the outputs available.
-                       */
-
-                       float scaling = limit/blimit;
-
-                       for (i = 0, n = 1; i < blimit; ++i, ++n) {
-
-                               /* first time through just copy a channel into
-                                  the output buffer.
-                               */
-
-                               Sample* bb = bufs.get_audio (i).data();
-
-                               for (nframes_t xx = 0; xx < nframes; ++xx) {
-                                       bb[xx] = b[xx] * scaling;
-                               }
-
-                               if (n < diskstream->n_channels().n_audio()) {
-                                       tmpb = diskstream->playback_buffer(n);
-                                       if (tmpb!=0) {
-                                               b = tmpb;
-                                       }
-                               }
-                       }
-
-                       for (;i < limit; ++i, ++n) {
-
-                               /* for all remaining channels, sum with existing
-                                  data in the output buffers
-                               */
-
-                               bufs.get_audio (i%blimit).accumulate_with_gain_from (b, nframes, 0, scaling);
-
-                               if (n < diskstream->n_channels().n_audio()) {
-                                       tmpb = diskstream->playback_buffer(n);
-                                       if (tmpb!=0) {
-                                               b = tmpb;
-                                       }
-                               }
-
-                       }
-
-                       limit = blimit;
+       _silent = false;
+       _amp->apply_gain_automation(false);
 
-               } else {
-                       for (i = 0, n = 1; i < limit; ++i, ++n) {
-                               memcpy (bufs.get_audio (i).data(), b, sizeof (Sample) * nframes);
-                               if (n < diskstream->n_channels().n_audio()) {
-                                       tmpb = diskstream->playback_buffer(n);
-                                       if (tmpb!=0) {
-                                               b = tmpb;
-                                       }
-                               }
-                       }
+       BufferSet& bufs = _session.get_route_buffers (n_process_buffers ());
 
-                       /* try to leave any MIDI buffers alone */
+       fill_buffers_with_input (bufs, _input, nframes);
 
-                       ChanCount chn;
-                       chn.set_audio (limit);
-                       chn.set_midi (_input->n_ports().n_midi());
-                       bufs.set_count (chn);
-               }
+       if (_meter_point == MeterInput && ((_monitoring_control->monitoring_choice() & MonitorInput) || _diskstream->record_enabled())) {
+               _meter->run (bufs, start_frame, end_frame, 1.0 /*speed()*/, nframes, true);
+       }
 
-               /* don't waste time with automation if we're recording or we've just stopped (yes it can happen) */
+       if ((dret = diskstream->process (bufs, transport_frame, nframes, playback_distance, (monitoring_state() == MonitoringDisk))) != 0) {
+               need_butler = diskstream->commit (playback_distance);
+               silence (nframes);
+               return dret;
+       }
 
-               if (!diskstream->record_enabled() && _session.transport_rolling()) {
-#ifdef XXX_MOVE_THIS_TO_AMP
-                       Glib::Mutex::Lock am (data().control_lock(), Glib::TRY_LOCK);
+       process_output_buffers (bufs, start_frame, end_frame, nframes, declick, (!diskstream->record_enabled() && _session.transport_rolling()));
 
-                       if (am.locked() && gain_control()->automation_playback()) {
-                               _amp->apply_gain_automation(
-                                               gain_control()->list()->curve().rt_safe_get_vector (
-                                                       start_frame, end_frame, _session.gain_automation_buffer(), nframes));
-                       }
-#endif
+       for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+               boost::shared_ptr<Delivery> d = boost::dynamic_pointer_cast<Delivery> (*i);
+               if (d) {
+                       d->flush_buffers (nframes);
                }
-
-               process_output_buffers (bufs, start_frame, end_frame, nframes, (!_session.get_record_enabled() || !Config->get_do_not_record_plugins()), declick);
-
-       } else {
-               /* problem with the diskstream; just be quiet for a bit */
-               silence (nframes);
        }
 
+       need_butler = diskstream->commit (playback_distance);
+
        return 0;
 }
 
 int
-AudioTrack::export_stuff (BufferSet& buffers, sframes_t start, nframes_t nframes, bool enable_processing)
+AudioTrack::export_stuff (BufferSet& buffers, framepos_t start, framecnt_t nframes,
+                         boost::shared_ptr<Processor> endpoint, bool include_endpoint, bool for_export, bool for_freeze)
 {
-       gain_t  gain_buffer[nframes];
-       float   mix_buffer[nframes];
-       ProcessorList::iterator i;
+       boost::scoped_array<gain_t> gain_buffer (new gain_t[nframes]);
+       boost::scoped_array<Sample> mix_buffer (new Sample[nframes]);
        boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
 
-       Glib::RWLock::ReaderLock rlock (_processor_lock);
+       Glib::Threads::RWLock::ReaderLock rlock (_processor_lock);
 
        boost::shared_ptr<AudioPlaylist> apl = boost::dynamic_pointer_cast<AudioPlaylist>(diskstream->playlist());
-       assert(apl);
 
-       assert(buffers.get_audio(0).capacity() >= nframes);
+       assert(apl);
+       assert(buffers.count().n_audio() >= 1);
+       assert ((framecnt_t) buffers.get_audio(0).capacity() >= nframes);
 
-       if (apl->read (buffers.get_audio(0).data(), mix_buffer, gain_buffer, start, nframes) != nframes) {
+       if (apl->read (buffers.get_audio(0).data(), mix_buffer.get(), gain_buffer.get(), start, nframes) != nframes) {
                return -1;
        }
 
-       assert(buffers.count().n_audio() >= 1);
        uint32_t n=1;
        Sample* b = buffers.get_audio(0).data();
        BufferSet::audio_iterator bi = buffers.audio_begin();
        ++bi;
        for ( ; bi != buffers.audio_end(); ++bi, ++n) {
                if (n < diskstream->n_channels().n_audio()) {
-                       if (apl->read (bi->data(), mix_buffer, gain_buffer, start, nframes, n) != nframes) {
+                       if (apl->read (bi->data(), mix_buffer.get(), gain_buffer.get(), start, nframes, n) != nframes) {
                                return -1;
                        }
                        b = bi->data();
-               }
-               else {
+               } else {
                        /* duplicate last across remaining buffers */
                        memcpy (bi->data(), b, sizeof (Sample) * nframes);
                }
        }
 
-       // If no processing is required, there's no need to go any further.
-       if (!enable_processing) {
-               return 0;
+       bounce_process (buffers, start, nframes, endpoint, include_endpoint, for_export, for_freeze);
+
+       return 0;
+}
+
+bool
+AudioTrack::bounceable (boost::shared_ptr<Processor> endpoint, bool include_endpoint) const
+{
+       if (!endpoint && !include_endpoint) {
+               /* no processing - just read from the playlist and create new
+                  files: always possible.
+               */
+               return true;
        }
 
-       /* note: only run processors during export. other layers in the machinery
-          will already have checked that there are no external port processors.
-       */
+       Glib::Threads::RWLock::ReaderLock lm (_processor_lock);
+       uint32_t naudio = n_inputs().n_audio();
+
+       for (ProcessorList::const_iterator r = _processors.begin(); r != _processors.end(); ++r) {
+
+               /* if we're not including the endpoint, potentially stop
+                  right here before we test matching i/o valences.
+               */
+
+               if (!include_endpoint && (*r) == endpoint) {
+                       return true;
+               }
 
-       for (i = _processors.begin(); i != _processors.end(); ++i) {
-               boost::shared_ptr<Processor> processor;
-               if ((processor = boost::dynamic_pointer_cast<Processor>(*i)) != 0) {
-                       processor->run (buffers, start, start+nframes, nframes);
+               /* ignore any processors that do routing, because we will not
+                * use them during a bounce/freeze/export operation.
+                */
+
+               if ((*r)->does_routing()) {
+                       continue;
+               }
+
+               /* does the output from the last considered processor match the
+                * input to this one?
+                */
+
+               if (naudio != (*r)->input_streams().n_audio()) {
+                       return false;
                }
+
+               /* we're including the endpoint - if we just hit it,
+                  then stop.
+               */
+
+               if ((*r) == endpoint) {
+                       return true;
+               }
+
+               /* save outputs of this processor to test against inputs
+                  of the next one.
+               */
+
+               naudio = (*r)->output_streams().n_audio();
        }
 
-       return 0;
+       return true;
 }
 
 boost::shared_ptr<Region>
 AudioTrack::bounce (InterThreadInfo& itt)
 {
-       vector<boost::shared_ptr<Source> > srcs;
-       return _session.write_one_track (*this, _session.current_start_frame(), _session.current_end_frame(), false, srcs, itt);
+       return bounce_range (_session.current_start_frame(), _session.current_end_frame(), itt, main_outs(), false);
 }
 
 boost::shared_ptr<Region>
-AudioTrack::bounce_range (nframes_t start, nframes_t end, InterThreadInfo& itt, bool enable_processing)
+AudioTrack::bounce_range (framepos_t start, framepos_t end, InterThreadInfo& itt,
+                         boost::shared_ptr<Processor> endpoint, bool include_endpoint)
 {
        vector<boost::shared_ptr<Source> > srcs;
-       return _session.write_one_track (*this, start, end, false, srcs, itt, enable_processing);
+       return _session.write_one_track (*this, start, end, false, srcs, itt, endpoint, include_endpoint, false, false);
 }
 
 void
-AudioTrack::freeze (InterThreadInfo& itt)
+AudioTrack::freeze_me (InterThreadInfo& itt)
 {
        vector<boost::shared_ptr<Source> > srcs;
        string new_playlist_name;
@@ -717,7 +540,7 @@ AudioTrack::freeze (InterThreadInfo& itt)
 
                candidate = string_compose ("<F%2>%1", _freeze_record.playlist->name(), n);
 
-               if (_session.playlist_by_name (candidate) == 0) {
+               if (_session.playlists->by_name (candidate) == 0) {
                        new_playlist_name = candidate;
                        break;
                }
@@ -735,52 +558,57 @@ AudioTrack::freeze (InterThreadInfo& itt)
 
        boost::shared_ptr<Region> res;
 
-       if ((res = _session.write_one_track (*this, _session.current_start_frame(), _session.current_end_frame(), true, srcs, itt)) == 0) {
+       if ((res = _session.write_one_track (*this, _session.current_start_frame(), _session.current_end_frame(),
+                                       true, srcs, itt, main_outs(), false, false, true)) == 0) {
                return;
        }
 
        _freeze_record.processor_info.clear ();
 
        {
-               Glib::RWLock::ReaderLock lm (_processor_lock);
+               Glib::Threads::RWLock::ReaderLock lm (_processor_lock);
 
                for (ProcessorList::iterator r = _processors.begin(); r != _processors.end(); ++r) {
 
-                       boost::shared_ptr<Processor> processor;
-
-                       if ((processor = boost::dynamic_pointer_cast<Processor>(*r)) != 0) {
+                       if ((*r)->does_routing() && (*r)->active()) {
+                               break;
+                       }
+                       if (!boost::dynamic_pointer_cast<PeakMeter>(*r)) {
 
-                               FreezeRecordProcessorInfo* frii  = new FreezeRecordProcessorInfo ((*r)->get_state(), processor);
+                               FreezeRecordProcessorInfo* frii  = new FreezeRecordProcessorInfo ((*r)->get_state(), (*r));
 
-                               frii->id = processor->id();
+                               frii->id = (*r)->id();
 
                                _freeze_record.processor_info.push_back (frii);
 
-                               /* now deactivate the processor */
-
-                               processor->deactivate ();
-                               _session.set_dirty ();
+                               /* now deactivate the processor, */
+                               if (!boost::dynamic_pointer_cast<Amp>(*r)) {
+                                       (*r)->deactivate ();
+                               }
                        }
+
+                       _session.set_dirty ();
                }
        }
 
        new_playlist = PlaylistFactory::create (DataType::AUDIO, _session, new_playlist_name, false);
 
-       _freeze_record.gain = _amp->gain();
-       _freeze_record.gain_automation_state = _amp->gain_control()->automation_state();
        /* XXX need main outs automation state _freeze_record.pan_automation_state = _mainpanner->automation_state(); */
 
        region_name = new_playlist_name;
 
        /* create a new region from all filesources, keep it private */
 
-       boost::shared_ptr<Region> region (RegionFactory::create (srcs, 0,
-                       srcs[0]->length(srcs[0]->timeline_position()),
-                       region_name, 0,
-                       (Region::Flag) (Region::WholeFile|Region::DefaultFlags),
-                       false));
+       PropertyList plist;
+
+       plist.add (Properties::start, 0);
+       plist.add (Properties::length, srcs[0]->length(srcs[0]->timeline_position()));
+       plist.add (Properties::name, region_name);
+       plist.add (Properties::whole_file, true);
+
+       boost::shared_ptr<Region> region (RegionFactory::create (srcs, plist, false));
 
-       new_playlist->set_orig_diskstream_id (diskstream->id());
+       new_playlist->set_orig_track_id (id());
        new_playlist->add_region (region, _session.current_start_frame());
        new_playlist->set_frozen (true);
        region->set_locked (true);
@@ -788,10 +616,13 @@ AudioTrack::freeze (InterThreadInfo& itt)
        diskstream->use_playlist (boost::dynamic_pointer_cast<AudioPlaylist>(new_playlist));
        diskstream->set_record_enabled (false);
 
+       _freeze_record.playlist->use(); // prevent deletion
+
        /* reset stuff that has already been accounted for in the freeze process */
 
-       set_gain (1.0, this);
-       _amp->gain_control()->set_automation_state (Off);
+       gain_control()->set_value (GAIN_COEFF_UNITY, Controllable::NoGroup);
+       gain_control()->set_automation_state (Off);
+
        /* XXX need to use _main_outs _panner->set_automation_state (Off); */
 
        _freeze_record.state = Frozen;
@@ -802,10 +633,11 @@ void
 AudioTrack::unfreeze ()
 {
        if (_freeze_record.playlist) {
+               _freeze_record.playlist->release();
                audio_diskstream()->use_playlist (_freeze_record.playlist);
 
                {
-                       Glib::RWLock::ReaderLock lm (_processor_lock); // should this be a write lock? jlc
+                       Glib::Threads::RWLock::ReaderLock lm (_processor_lock); // should this be a write lock? jlc
                        for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
                                for (vector<FreezeRecordProcessorInfo*>::iterator ii = _freeze_record.processor_info.begin(); ii != _freeze_record.processor_info.end(); ++ii) {
                                        if ((*ii)->id == (*i)->id()) {
@@ -817,8 +649,6 @@ AudioTrack::unfreeze ()
                }
 
                _freeze_record.playlist.reset ();
-               set_gain (_freeze_record.gain, this);
-               _amp->gain_control()->set_automation_state (_freeze_record.gain_automation_state);
                /* XXX need to use _main_outs _panner->set_automation_state (_freeze_record.pan_automation_state); */
        }
 
@@ -826,3 +656,16 @@ AudioTrack::unfreeze ()
        FreezeChange (); /* EMIT SIGNAL */
 }
 
+boost::shared_ptr<AudioFileSource>
+AudioTrack::write_source (uint32_t n)
+{
+       boost::shared_ptr<AudioDiskstream> ds = boost::dynamic_pointer_cast<AudioDiskstream> (_diskstream);
+       assert (ds);
+       return ds->write_source (n);
+}
+
+boost::shared_ptr<Diskstream>
+AudioTrack::diskstream_factory (XMLNode const & node)
+{
+       return boost::shared_ptr<Diskstream> (new AudioDiskstream (_session, node));
+}