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-rw-r--r--libs/ardour/crossfade.cc877
1 files changed, 877 insertions, 0 deletions
diff --git a/libs/ardour/crossfade.cc b/libs/ardour/crossfade.cc
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+++ b/libs/ardour/crossfade.cc
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+/*
+ Copyright (C) 2003 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.
+
+ $Id$
+*/
+
+#include <sigc++/bind.h>
+
+#include <ardour/types.h>
+#include <ardour/crossfade.h>
+#include <ardour/crossfade_compare.h>
+#include <ardour/audioregion.h>
+#include <ardour/playlist.h>
+#include <ardour/utils.h>
+#include <ardour/session.h>
+
+#include "i18n.h"
+#include <locale.h>
+
+using namespace std;
+using namespace ARDOUR;
+//using namespace sigc;
+
+jack_nframes_t Crossfade::_short_xfade_length = 0;
+Change Crossfade::ActiveChanged = ARDOUR::new_change();
+
+/* XXX if and when we ever implement parallel processing of the process()
+ callback, these will need to be handled on a per-thread basis.
+*/
+
+Sample* Crossfade::crossfade_buffer_out = 0;
+Sample* Crossfade::crossfade_buffer_in = 0;
+
+void
+Crossfade::set_buffer_size (jack_nframes_t sz)
+{
+ if (crossfade_buffer_out) {
+ delete [] crossfade_buffer_out;
+ crossfade_buffer_out = 0;
+ }
+
+ if (crossfade_buffer_in) {
+ delete [] crossfade_buffer_in;
+ crossfade_buffer_in = 0;
+ }
+
+ if (sz) {
+ crossfade_buffer_out = new Sample[sz];
+ crossfade_buffer_in = new Sample[sz];
+ }
+}
+
+bool
+Crossfade::operator== (const Crossfade& other)
+{
+ return (_in == other._in) && (_out == other._out);
+}
+
+Crossfade::Crossfade (ARDOUR::AudioRegion& in, ARDOUR::AudioRegion& out,
+ jack_nframes_t length,
+ jack_nframes_t position,
+ AnchorPoint ap)
+ : _fade_in (0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
+ _fade_out (0.0, 2.0, 1.0) // linear (gain coefficient) => -inf..+6dB
+{
+ _in = &in;
+ _out = &out;
+ _length = length;
+ _position = position;
+ _anchor_point = ap;
+ _follow_overlap = false;
+ _active = true;
+ _fixed = true;
+
+ initialize ();
+}
+
+Crossfade::Crossfade (ARDOUR::AudioRegion& a, ARDOUR::AudioRegion& b, CrossfadeModel model, bool act)
+ : _fade_in (0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
+ _fade_out (0.0, 2.0, 1.0) // linear (gain coefficient) => -inf..+6dB
+{
+ _in_update = false;
+ _fixed = false;
+
+ if (compute (a, b, model)) {
+ throw failed_constructor();
+ }
+
+ _active = act;
+
+ initialize ();
+
+}
+
+Crossfade::Crossfade (const Playlist& playlist, XMLNode& node)
+ : _fade_in (0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
+ _fade_out (0.0, 2.0, 1.0) // linear (gain coefficient) => -inf..+6dB
+{
+ Region* r;
+ XMLProperty* prop;
+ id_t id;
+ LocaleGuard lg (X_("POSIX"));
+
+ /* we have to find the in/out regions before we can do anything else */
+
+ if ((prop = node.property ("in")) == 0) {
+ error << _("Crossfade: no \"in\" region in state") << endmsg;
+ throw failed_constructor();
+ }
+
+ sscanf (prop->value().c_str(), "%llu", &id);
+
+ if ((r = playlist.find_region (id)) == 0) {
+ error << compose (_("Crossfade: no \"in\" region %1 found in playlist %2"), id, playlist.name())
+ << endmsg;
+ throw failed_constructor();
+ }
+
+ if ((_in = dynamic_cast<AudioRegion*> (r)) == 0) {
+ throw failed_constructor();
+ }
+
+ if ((prop = node.property ("out")) == 0) {
+ error << _("Crossfade: no \"out\" region in state") << endmsg;
+ throw failed_constructor();
+ }
+
+ sscanf (prop->value().c_str(), "%llu", &id);
+
+ if ((r = playlist.find_region (id)) == 0) {
+ error << compose (_("Crossfade: no \"out\" region %1 found in playlist %2"), id, playlist.name())
+ << endmsg;
+ throw failed_constructor();
+ }
+
+ if ((_out = dynamic_cast<AudioRegion*> (r)) == 0) {
+ throw failed_constructor();
+ }
+
+ _length = 0;
+ initialize();
+
+ if (set_state (node)) {
+ throw failed_constructor();
+ }
+}
+
+Crossfade::~Crossfade ()
+{
+ for (StateMap::iterator i = states.begin(); i != states.end(); ++i) {
+ delete *i;
+ }
+}
+
+void
+Crossfade::initialize ()
+{
+ _in_update = false;
+
+ _out->suspend_fade_out ();
+ _in->suspend_fade_in ();
+
+ _fade_out.freeze ();
+ _fade_out.clear ();
+ _fade_out.add (0.0, 1.0);
+ _fade_out.add ((_length * 0.1), 0.99);
+ _fade_out.add ((_length * 0.2), 0.97);
+ _fade_out.add ((_length * 0.8), 0.03);
+ _fade_out.add ((_length * 0.9), 0.01);
+ _fade_out.add (_length, 0.0);
+ _fade_out.thaw ();
+
+ _fade_in.freeze ();
+ _fade_in.clear ();
+ _fade_in.add (0.0, 0.0);
+ _fade_in.add ((_length * 0.1), 0.01);
+ _fade_in.add ((_length * 0.2), 0.03);
+ _fade_in.add ((_length * 0.8), 0.97);
+ _fade_in.add ((_length * 0.9), 0.99);
+ _fade_in.add (_length, 1.0);
+ _fade_in.thaw ();
+
+// _in->StateChanged.connect (slot (*this, &Crossfade::member_changed));
+// _out->StateChanged.connect (slot (*this, &Crossfade::member_changed));
+
+ overlap_type = _in->coverage (_out->position(), _out->last_frame());
+
+ save_state ("initial");
+}
+
+int
+Crossfade::compute (AudioRegion& a, AudioRegion& b, CrossfadeModel model)
+{
+ AudioRegion* top;
+ AudioRegion* bottom;
+ jack_nframes_t short_xfade_length;
+
+ short_xfade_length = _short_xfade_length;
+
+ if (a.layer() < b.layer()) {
+ top = &b;
+ bottom = &a;
+ } else {
+ top = &a;
+ bottom = &b;
+ }
+
+ /* first check for matching ends */
+
+ if (top->first_frame() == bottom->first_frame()) {
+
+ /* Both regions start at the same point */
+
+ if (top->last_frame() < bottom->last_frame()) {
+
+ /* top ends before bottom, so put an xfade
+ in at the end of top.
+ */
+
+ /* [-------- top ---------- ]
+ * {====== bottom =====================}
+ */
+
+ _in = bottom;
+ _out = top;
+
+ if (top->last_frame() < short_xfade_length) {
+ _position = 0;
+ } else {
+ _position = top->last_frame() - short_xfade_length;
+ }
+
+ _length = min (short_xfade_length, top->length());
+ _follow_overlap = false;
+ _anchor_point = EndOfIn;
+ _active = true;
+ _fixed = true;
+
+ } else {
+ /* top ends after (or same time) as bottom - no xfade
+ */
+
+ /* [-------- top ------------------------ ]
+ * {====== bottom =====================}
+ */
+
+ throw NoCrossfadeHere();
+ }
+
+ } else if (top->last_frame() == bottom->last_frame()) {
+
+ /* Both regions end at the same point */
+
+ if (top->first_frame() > bottom->first_frame()) {
+
+ /* top starts after bottom, put an xfade in at the
+ start of top
+ */
+
+ /* [-------- top ---------- ]
+ * {====== bottom =====================}
+ */
+
+ _in = top;
+ _out = bottom;
+ _position = top->first_frame();
+ _length = min (short_xfade_length, top->length());
+ _follow_overlap = false;
+ _anchor_point = StartOfIn;
+ _active = true;
+ _fixed = true;
+
+ } else {
+ /* top starts before bottom - no xfade
+ */
+
+ /* [-------- top ------------------------ ]
+ * {====== bottom =====================}
+ */
+
+ throw NoCrossfadeHere();
+ }
+
+ } else {
+
+ /* OK, time to do more regular overlapping */
+
+ OverlapType ot = top->coverage (bottom->first_frame(), bottom->last_frame());
+
+ switch (ot) {
+ case OverlapNone:
+ /* should be NOTREACHED as a precondition of creating
+ a new crossfade, but we need to handle it here.
+ */
+ throw NoCrossfadeHere();
+ break;
+
+ case OverlapInternal:
+ case OverlapExternal:
+ /* should be NOTREACHED because of tests above */
+ throw NoCrossfadeHere();
+ break;
+
+ case OverlapEnd: /* top covers start of bottom but ends within it */
+
+ /* [---- top ------------------------]
+ * { ==== bottom ============ }
+ */
+
+ _in = bottom;
+ _out = top;
+ _position = bottom->first_frame();
+ _anchor_point = StartOfIn;
+
+ if (model == FullCrossfade) {
+ _length = _out->first_frame() + _out->length() - _in->first_frame();
+ /* leave active alone */
+ _follow_overlap = true;
+ } else {
+ _length = min (short_xfade_length, top->length());
+ _active = true;
+ _follow_overlap = false;
+
+ }
+ break;
+
+ case OverlapStart: /* top starts within bottom but covers bottom's end */
+
+ /* { ==== top ============ }
+ * [---- bottom -------------------]
+ */
+
+ _in = top;
+ _out = bottom;
+ _position = top->first_frame();
+ _anchor_point = StartOfIn;
+
+ if (model == FullCrossfade) {
+ _length = _out->first_frame() + _out->length() - _in->first_frame();
+ /* leave active alone */
+ _follow_overlap = true;
+ } else {
+ _length = min (short_xfade_length, top->length());
+ _active = true;
+ _follow_overlap = false;
+
+ }
+
+ break;
+ }
+ }
+
+ return 0;
+}
+
+jack_nframes_t
+Crossfade::read_at (Sample *buf, Sample *mixdown_buffer,
+ float *gain_buffer, jack_nframes_t start, jack_nframes_t cnt, uint32_t chan_n,
+ jack_nframes_t read_frames, jack_nframes_t skip_frames)
+{
+ jack_nframes_t offset;
+ jack_nframes_t to_write;
+
+ if (!_active) {
+ return 0;
+ }
+
+ if (start < _position) {
+
+ /* handle an initial section of the read area that we do not
+ cover.
+ */
+
+ offset = _position - start;
+
+ if (offset < cnt) {
+ cnt -= offset;
+ } else {
+ return 0;
+ }
+
+ start = _position;
+ buf += offset;
+ to_write = min (_length, cnt);
+
+ } else {
+
+ to_write = min (_length - (start - _position), cnt);
+
+ }
+
+ offset = start - _position;
+
+ _out->read_at (crossfade_buffer_out, mixdown_buffer, gain_buffer, start, to_write, chan_n, read_frames, skip_frames);
+ _in->read_at (crossfade_buffer_in, mixdown_buffer, gain_buffer, start, to_write, chan_n, read_frames, skip_frames);
+
+ float* fiv = new float[to_write];
+ float* fov = new float[to_write];
+
+ _fade_in.get_vector (offset, offset+to_write, fiv, to_write);
+ _fade_out.get_vector (offset, offset+to_write, fov, to_write);
+
+ /* note: although we have not explicitly taken into account the return values
+ from _out->read_at() or _in->read_at(), the length() function does this
+ implicitly. why? because it computes a value based on the in+out regions'
+ position and length, and so we know precisely how much data they could return.
+ */
+
+ for (jack_nframes_t n = 0; n < to_write; ++n) {
+ buf[n] = (crossfade_buffer_out[n] * fov[n]) + (crossfade_buffer_in[n] * fiv[n]);
+ }
+
+ delete [] fov;
+ delete [] fiv;
+
+ return to_write;
+}
+
+OverlapType
+Crossfade::coverage (jack_nframes_t start, jack_nframes_t end) const
+{
+ jack_nframes_t my_end = _position + _length;
+
+ if ((start >= _position) && (end <= my_end)) {
+ return OverlapInternal;
+ }
+ if ((end >= _position) && (end <= my_end)) {
+ return OverlapStart;
+ }
+ if ((start >= _position) && (start <= my_end)) {
+ return OverlapEnd;
+ }
+ if ((_position >= start) && (_position <= end) && (my_end <= end)) {
+ return OverlapExternal;
+ }
+ return OverlapNone;
+}
+
+void
+Crossfade::set_active (bool yn)
+{
+ if (_active != yn) {
+ _active = yn;
+ save_state (_("active changed"));
+ send_state_changed (ActiveChanged);
+ }
+}
+
+bool
+Crossfade::refresh ()
+{
+ /* crossfades must be between non-muted regions */
+
+ if (_out->muted() || _in->muted()) {
+ Invalidated (this);
+ return false;
+ }
+
+ /* overlap type must be Start, End or External */
+
+ OverlapType ot;
+
+ ot = _in->coverage (_out->first_frame(), _out->last_frame());
+
+ switch (ot) {
+ case OverlapNone:
+ case OverlapInternal:
+ Invalidated (this);
+ return false;
+
+ default:
+ break;
+ }
+
+ /* overlap type must not have altered */
+
+ if (ot != overlap_type) {
+ Invalidated (this);
+ return false;
+ }
+
+ /* time to update */
+
+ return update (false);
+}
+
+bool
+Crossfade::update (bool force)
+{
+ jack_nframes_t newlen;
+ bool save = false;
+
+ if (_follow_overlap) {
+ newlen = _out->first_frame() + _out->length() - _in->first_frame();
+ } else {
+ newlen = _length;
+ }
+
+ if (newlen == 0) {
+ Invalidated (this);
+ return false;
+ }
+
+ _in_update = true;
+
+ if (force || (_follow_overlap && newlen != _length) || (_length > newlen)) {
+
+ double factor = newlen / (double) _length;
+
+ _fade_out.x_scale (factor);
+ _fade_in.x_scale (factor);
+
+ _length = newlen;
+
+ save = true;
+
+ }
+
+ switch (_anchor_point) {
+ case StartOfIn:
+ if (_position != _in->first_frame()) {
+ _position = _in->first_frame();
+ save = true;
+ }
+ break;
+
+ case EndOfIn:
+ if (_position != _in->last_frame() - _length) {
+ _position = _in->last_frame() - _length;
+ save = true;
+ }
+ break;
+
+ case EndOfOut:
+ if (_position != _out->last_frame() - _length) {
+ _position = _out->last_frame() - _length;
+ save = true;
+ }
+ }
+
+ if (save) {
+ save_state ("updated");
+ }
+
+ /* UI's may need to know that the overlap changed even
+ though the xfade length did not.
+ */
+
+ send_state_changed (BoundsChanged); /* EMIT SIGNAL */
+
+ _in_update = false;
+
+ return true;
+}
+
+void
+Crossfade::member_changed (Change what_changed)
+{
+ Change what_we_care_about = Change (Region::MuteChanged|
+ Region::LayerChanged|
+ ARDOUR::BoundsChanged);
+
+ if (what_changed & what_we_care_about) {
+ refresh ();
+ }
+}
+
+Change
+Crossfade::restore_state (StateManager::State& state)
+{
+ CrossfadeState* xfstate = dynamic_cast<CrossfadeState*> (&state);
+ Change what_changed = Change (0);
+
+ _in_update = true;
+
+ xfstate->fade_in_memento ();
+ xfstate->fade_out_memento ();
+
+ if (_length != xfstate->length) {
+ what_changed = Change (what_changed|LengthChanged);
+ _length = xfstate->length;
+ }
+ if (_active != xfstate->active) {
+ what_changed = Change (what_changed|ActiveChanged);
+ _active = xfstate->active;
+ }
+ if (_position != xfstate->position) {
+ what_changed = Change (what_changed|PositionChanged);
+ _position = xfstate->position;
+ }
+
+ /* XXX what to do about notifications for these? I don't
+ think (G)UI cares about them because they are
+ implicit in the bounds.
+ */
+
+ _follow_overlap = xfstate->follow_overlap;
+ _anchor_point = xfstate->anchor_point;
+
+ _in_update = false;
+
+ return Change (what_changed);
+}
+
+StateManager::State*
+Crossfade::state_factory (std::string why) const
+{
+ CrossfadeState* state = new CrossfadeState (why);
+
+ state->fade_in_memento = _fade_in.get_memento ();
+ state->fade_out_memento = _fade_out.get_memento ();
+ state->active = _active;
+ state->length = _length;
+ state->position = _position;
+ state->follow_overlap = _follow_overlap;
+ state->anchor_point = _anchor_point;
+
+ return state;
+}
+
+UndoAction
+Crossfade::get_memento() const
+{
+ return sigc::bind (mem_fun (*(const_cast<Crossfade *> (this)), &StateManager::use_state), _current_state_id);
+}
+
+XMLNode&
+Crossfade::get_state ()
+{
+ XMLNode* node = new XMLNode (X_("Crossfade"));
+ XMLNode* child;
+ char buf[64];
+ LocaleGuard lg (X_("POSIX"));
+
+ snprintf (buf, sizeof(buf), "%" PRIu64, _out->id());
+ node->add_property ("out", buf);
+ snprintf (buf, sizeof(buf), "%" PRIu64, _in->id());
+ node->add_property ("in", buf);
+ node->add_property ("active", (_active ? "yes" : "no"));
+ node->add_property ("follow-overlap", (_follow_overlap ? "yes" : "no"));
+ node->add_property ("fixed", (_fixed ? "yes" : "no"));
+ snprintf (buf, sizeof(buf), "%" PRIu32, _length);
+ node->add_property ("length", buf);
+ snprintf (buf, sizeof(buf), "%" PRIu32, (uint32_t) _anchor_point);
+ node->add_property ("anchor-point", buf);
+ snprintf (buf, sizeof(buf), "%" PRIu32, (uint32_t) _position);
+ node->add_property ("position", buf);
+
+ child = node->add_child ("FadeIn");
+
+ for (AutomationList::iterator ii = _fade_in.begin(); ii != _fade_in.end(); ++ii) {
+ XMLNode* pnode;
+
+ pnode = new XMLNode ("point");
+
+ snprintf (buf, sizeof (buf), "%" PRIu32, (jack_nframes_t) floor ((*ii)->when));
+ pnode->add_property ("x", buf);
+ snprintf (buf, sizeof (buf), "%f", (*ii)->value);
+ pnode->add_property ("y", buf);
+ child->add_child_nocopy (*pnode);
+ }
+
+ child = node->add_child ("FadeOut");
+
+ for (AutomationList::iterator ii = _fade_out.begin(); ii != _fade_out.end(); ++ii) {
+ XMLNode* pnode;
+
+ pnode = new XMLNode ("point");
+
+ snprintf (buf, sizeof (buf), "%" PRIu32, (jack_nframes_t) floor ((*ii)->when));
+ pnode->add_property ("x", buf);
+ snprintf (buf, sizeof (buf), "%f", (*ii)->value);
+ pnode->add_property ("y", buf);
+ child->add_child_nocopy (*pnode);
+ }
+
+ return *node;
+}
+
+int
+Crossfade::set_state (const XMLNode& node)
+{
+ XMLNodeConstIterator i;
+ XMLNodeList children;
+ XMLNode* fi;
+ XMLNode* fo;
+ const XMLProperty* prop;
+ LocaleGuard lg (X_("POSIX"));
+
+ if ((prop = node.property ("position")) != 0) {
+ _position = atoi (prop->value().c_str());
+ } else {
+ warning << _("old-style crossfade information - no position information") << endmsg;
+ _position = _in->first_frame();
+ }
+
+ if ((prop = node.property ("active")) != 0) {
+ _active = (prop->value() == "yes");
+ } else {
+ _active = true;
+ }
+
+ if ((prop = node.property ("follow-overlap")) != 0) {
+ _follow_overlap = (prop->value() == "yes");
+ } else {
+ _follow_overlap = false;
+ }
+
+ if ((prop = node.property ("fixed")) != 0) {
+ _fixed = (prop->value() == "yes");
+ } else {
+ _fixed = false;
+ }
+
+ if ((prop = node.property ("anchor-point")) != 0) {
+ _anchor_point = AnchorPoint (atoi ((prop->value().c_str())));
+ } else {
+ _anchor_point = StartOfIn;
+ }
+
+ if ((prop = node.property ("length")) != 0) {
+
+ _length = atol (prop->value().c_str());
+
+ } else {
+
+ /* XXX this branch is legacy code from before
+ the point where we stored xfade lengths.
+ */
+
+ if ((_length = overlap_length()) == 0) {
+ throw failed_constructor();
+ }
+ }
+
+ if ((fi = find_named_node (node, "FadeIn")) == 0) {
+ return -1;
+ }
+
+ if ((fo = find_named_node (node, "FadeOut")) == 0) {
+ return -1;
+ }
+
+ /* fade in */
+
+ _fade_in.clear ();
+
+ children = fi->children();
+
+ for (i = children.begin(); i != children.end(); ++i) {
+ if ((*i)->name() == "point") {
+ jack_nframes_t x;
+ float y;
+
+ prop = (*i)->property ("x");
+ sscanf (prop->value().c_str(), "%" PRIu32, &x);
+
+ prop = (*i)->property ("y");
+ sscanf (prop->value().c_str(), "%f", &y);
+
+ _fade_in.add (x, y);
+ }
+ }
+
+ /* fade out */
+
+ _fade_out.clear ();
+
+ children = fo->children();
+
+ for (i = children.begin(); i != children.end(); ++i) {
+ if ((*i)->name() == "point") {
+ jack_nframes_t x;
+ float y;
+ XMLProperty* prop;
+
+ prop = (*i)->property ("x");
+ sscanf (prop->value().c_str(), "%" PRIu32, &x);
+
+ prop = (*i)->property ("y");
+ sscanf (prop->value().c_str(), "%f", &y);
+
+ _fade_out.add (x, y);
+ }
+ }
+
+ return 0;
+}
+
+bool
+Crossfade::can_follow_overlap () const
+{
+ return !_fixed;
+}
+
+void
+Crossfade::set_follow_overlap (bool yn)
+{
+ if (yn == _follow_overlap || _fixed) {
+ return;
+ }
+
+ _follow_overlap = yn;
+
+ if (!yn) {
+ set_length (_short_xfade_length);
+ } else {
+ set_length (_out->first_frame() + _out->length() - _in->first_frame());
+ }
+}
+
+jack_nframes_t
+Crossfade::set_length (jack_nframes_t len)
+{
+ jack_nframes_t limit;
+
+ switch (_anchor_point) {
+ case StartOfIn:
+ limit = _in->length();
+ break;
+
+ case EndOfIn:
+ limit = _in->length();
+ break;
+
+ case EndOfOut:
+ limit = _out->length();
+ break;
+
+ }
+
+ len = min (limit, len);
+
+ double factor = len / (double) _length;
+
+ _in_update = true;
+ _fade_out.x_scale (factor);
+ _fade_in.x_scale (factor);
+ _in_update = false;
+
+ _length = len;
+
+ save_state ("length changed");
+
+ send_state_changed (LengthChanged);
+
+ return len;
+}
+
+jack_nframes_t
+Crossfade::overlap_length () const
+{
+ if (_fixed) {
+ return _length;
+ }
+ return _out->first_frame() + _out->length() - _in->first_frame();
+}
+
+void
+Crossfade::set_short_xfade_length (jack_nframes_t n)
+{
+ _short_xfade_length = n;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-11 23:12:02 +0000