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Diffstat (limited to 'libs/ardour/crossfade.cc')
| -rw-r--r-- | libs/ardour/crossfade.cc | 1008 |
1 files changed, 0 insertions, 1008 deletions
diff --git a/libs/ardour/crossfade.cc b/libs/ardour/crossfade.cc deleted file mode 100644 index d1db33bdcd..0000000000 --- a/libs/ardour/crossfade.cc +++ /dev/null @@ -1,1008 +0,0 @@ -/* - Copyright (C) 2003-2006 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 - 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. - -*/ - -#include "ardour/debug.h" -#include "ardour/types.h" -#include "ardour/crossfade.h" -#include "ardour/audioregion.h" -#include "ardour/playlist.h" -#include "ardour/utils.h" -#include "ardour/session.h" -#include "ardour/source.h" -#include "ardour/region_factory.h" - -#include "i18n.h" -#include <locale.h> - -using namespace std; -using namespace ARDOUR; -using namespace PBD; - -framecnt_t Crossfade::_short_xfade_length = 0; - -/* 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; - - -#define CROSSFADE_DEFAULT_PROPERTIES \ - _active (Properties::active, _session.config.get_xfades_active ()) \ - , _follow_overlap (Properties::follow_overlap, false) - - -namespace ARDOUR { - namespace Properties { - PropertyDescriptor<bool> follow_overlap; - } -} - -void -Crossfade::make_property_quarks () -{ - Properties::follow_overlap.property_id = g_quark_from_static_string (X_("follow-overlap")); - DEBUG_TRACE (DEBUG::Properties, string_compose ("quark for follow-overlap = %1\n", Properties::follow_overlap.property_id)); -} - -void -Crossfade::set_buffer_size (framecnt_t sz) -{ - delete [] crossfade_buffer_out; - crossfade_buffer_out = 0; - - 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 (boost::shared_ptr<AudioRegion> in, boost::shared_ptr<AudioRegion> out, - framecnt_t length, - AnchorPoint ap) - : AudioRegion (in->session(), 0, length, in->name() + string ("<>") + out->name()) - , CROSSFADE_DEFAULT_PROPERTIES - , _fade_in (Evoral::Parameter(FadeInAutomation)) // linear (gain coefficient) => -inf..+6dB - , _fade_out (Evoral::Parameter(FadeOutAutomation)) // linear (gain coefficient) => -inf..+6dB - -{ - register_properties (); - - _in = in; - _out = out; - _anchor_point = ap; - _fixed = true; - _follow_overlap = false; - - initialize (); -} - -Crossfade::Crossfade (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioRegion> b, CrossfadeModel model, bool act) - : AudioRegion (a->session(), 0, 0, a->name() + string ("<>") + b->name()) - , CROSSFADE_DEFAULT_PROPERTIES - , _fade_in (Evoral::Parameter(FadeInAutomation)) // linear (gain coefficient) => -inf..+6dB - , _fade_out (Evoral::Parameter(FadeOutAutomation)) // linear (gain coefficient) => -inf..+6dB -{ - register_properties (); - - _in_update = false; - _fixed = false; - _follow_overlap = false; - - if (compute (a, b, model)) { - throw failed_constructor(); - } - - _active = act; - - initialize (); -} - -Crossfade::Crossfade (const Playlist& playlist, XMLNode const & node) - : AudioRegion (playlist.session(), 0, 0, "unnamed crossfade") - , CROSSFADE_DEFAULT_PROPERTIES - , _fade_in (Evoral::Parameter(FadeInAutomation)) // linear (gain coefficient) => -inf..+6dB - , _fade_out (Evoral::Parameter(FadeOutAutomation)) // linear (gain coefficient) => -inf..+6dB - -{ - register_properties (); - - boost::shared_ptr<Region> r; - XMLProperty const * prop; - 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(); - } - - PBD::ID id (prop->value()); - - r = playlist.find_region (id); - - if (!r) { - /* the `in' region is not in a playlist, which probably means that this crossfade - is in the undo record, so we have to find the region in the global region map. - */ - r = RegionFactory::region_by_id (id); - } - - if (!r) { - error << string_compose (_("Crossfade: no \"in\" region %1 found in playlist %2 nor in region map"), id, playlist.name()) - << endmsg; - throw failed_constructor(); - } - - if ((_in = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) { - throw failed_constructor(); - } - - if ((prop = node.property ("out")) == 0) { - error << _("Crossfade: no \"out\" region in state") << endmsg; - throw failed_constructor(); - } - - PBD::ID id2 (prop->value()); - - r = playlist.find_region (id2); - - if (!r) { - r = RegionFactory::region_by_id (id2); - } - - if (!r) { - error << string_compose (_("Crossfade: no \"out\" region %1 found in playlist %2 nor in region map"), id2, playlist.name()) - << endmsg; - throw failed_constructor(); - } - - if ((_out = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) { - throw failed_constructor(); - } - - _length = 0; - initialize(); - _active = true; - - if (set_state (node, Stateful::loading_state_version)) { - throw failed_constructor(); - } -} - -Crossfade::Crossfade (boost::shared_ptr<Crossfade> orig, boost::shared_ptr<AudioRegion> newin, boost::shared_ptr<AudioRegion> newout) - : AudioRegion (boost::dynamic_pointer_cast<const AudioRegion> (orig), 0) - , CROSSFADE_DEFAULT_PROPERTIES - , _fade_in (orig->_fade_in) - , _fade_out (orig->_fade_out) -{ - register_properties (); - - _active = orig->_active; - _in_update = orig->_in_update; - _anchor_point = orig->_anchor_point; - _follow_overlap = orig->_follow_overlap; - _fixed = orig->_fixed; - _position = orig->_position; - - _in = newin; - _out = newout; - - // copied from Crossfade::initialize() - _in_update = false; - - _out->suspend_fade_out (); - _in->suspend_fade_in (); - - overlap_type = _in->coverage (_out->position(), _out->last_frame()); - layer_relation = (int32_t) (_in->layer() - _out->layer()); - - // Let's make sure the fade isn't too long - set_xfade_length(_length); -} - - -Crossfade::~Crossfade () -{ -} - -void -Crossfade::register_properties () -{ - add_property (_active); - add_property (_follow_overlap); -} - -void -Crossfade::initialize () -{ - /* merge source lists from regions */ - - _sources = _in->sources(); - _sources.insert (_sources.end(), _out->sources().begin(), _out->sources().end()); - - for (SourceList::iterator i = _sources.begin(); i != _sources.end(); ++i) { - (*i)->inc_use_count (); - } - - _master_sources = _in->master_sources(); - _master_sources.insert(_master_sources.end(), _out->master_sources().begin(), _out->master_sources().end()); - - for (SourceList::iterator i = _master_sources.begin(); i != _master_sources.end(); ++i) { - (*i)->inc_use_count (); - } - - _in_update = false; - - _out->suspend_fade_out (); - _in->suspend_fade_in (); - - _fade_out.freeze (); - _fade_out.clear (); - -#define EQUAL_POWER_MINUS_3DB -#ifdef EQUAL_POWER_MINUS_3DB - - _fade_out.add ((_length * 0.000000), 1.000000); - _fade_out.add ((_length * 0.166667), 0.948859); - _fade_out.add ((_length * 0.333333), 0.851507); - _fade_out.add ((_length * 0.500000), 0.707946); - _fade_out.add ((_length * 0.666667), 0.518174); - _fade_out.add ((_length * 0.833333), 0.282192); - _fade_out.add ((_length * 1.000000), 0.000000); - -#else // EQUAL_POWER_MINUS_6DB - - _fade_out.add ((_length * 0.000000), 1.000000); - _fade_out.add ((_length * 0.166667), 0.833033); - _fade_out.add ((_length * 0.333333), 0.666186); - _fade_out.add ((_length * 0.500000), 0.499459); - _fade_out.add ((_length * 0.666667), 0.332853); - _fade_out.add ((_length * 0.833333), 0.166366); - _fade_out.add ((_length * 1.000000), 0.000000); -#endif - - _fade_out.thaw (); - - _fade_in.freeze (); - _fade_in.clear (); - -#define EQUAL_POWER_MINUS_3DB -#ifdef EQUAL_POWER_MINUS_3DB - - _fade_in.add ((_length * 0.000000), 0.000000); - _fade_in.add ((_length * 0.166667), 0.282192); - _fade_in.add ((_length * 0.333333), 0.518174); - _fade_in.add ((_length * 0.500000), 0.707946); - _fade_in.add ((_length * 0.666667), 0.851507); - _fade_in.add ((_length * 0.833333), 0.948859); - _fade_in.add ((_length * 1.000000), 1.000000); - -#else // EQUAL_POWER_MINUS_SIX_DB - - _fade_in.add ((_length * 0.000000), 0.000000); - _fade_in.add ((_length * 0.166667), 0.166366); - _fade_in.add ((_length * 0.333333), 0.332853); - _fade_in.add ((_length * 0.500000), 0.499459); - _fade_in.add ((_length * 0.666667), 0.666186); - _fade_in.add ((_length * 0.833333), 0.833033); - _fade_in.add ((_length * 1.000000), 1.000000); - -#endif - - _fade_in.thaw (); - - overlap_type = _in->coverage (_out->position(), _out->last_frame()); - layer_relation = (int32_t) (_in->layer() - _out->layer()); -} - -framecnt_t -Crossfade::read_raw_internal (Sample* buf, framepos_t start, framecnt_t cnt, int channel) const -{ - Sample* mixdown = new Sample[cnt]; - float* gain = new float[cnt]; - framecnt_t ret; - - ret = read_at (buf, mixdown, gain, start, cnt, channel); - - delete [] mixdown; - delete [] gain; - - return ret; -} - -framecnt_t -Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, - float *gain_buffer, framepos_t start, framecnt_t cnt, uint32_t chan_n) const -{ - frameoffset_t offset; - framecnt_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.val(), cnt); - - } else { - - to_write = min ((_length - (start - _position)), cnt); - - } - - offset = start - _position; - - /* Prevent data from piling up inthe crossfade buffers when reading a transparent region */ - if (!(_out->opaque())) { - memset (crossfade_buffer_out, 0, sizeof (Sample) * to_write); - } else if (!(_in->opaque())) { - memset (crossfade_buffer_in, 0, sizeof (Sample) * to_write); - } - - _out->read_at (crossfade_buffer_out, mixdown_buffer, gain_buffer, start, to_write, chan_n); - _in->read_at (crossfade_buffer_in, mixdown_buffer, gain_buffer, start, to_write, chan_n); - - float* fiv = new float[to_write]; - float* fov = new float[to_write]; - - _fade_in.curve().get_vector (offset, offset+to_write, fiv, to_write); - _fade_out.curve().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 (framecnt_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 (framepos_t start, framepos_t end) const -{ - framepos_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; - PropertyChanged (PropertyChange (Properties::active)); - } -} - -bool -Crossfade::refresh () -{ - /* crossfades must be between non-muted regions */ - - if (_out->muted() || _in->muted()) { - Invalidated (shared_from_this ()); - return false; - } - - /* Top layer shouldn't be transparent */ - - if (!((layer_relation > 0 ? _in : _out)->opaque())) { - Invalidated (shared_from_this()); - return false; - } - - /* regions must cannot be identically sized and placed */ - - if (_in->position() == _out->position() && _in->length() == _out->length()) { - Invalidated (shared_from_this()); - return false; - } - - /* layer ordering cannot change */ - - int32_t new_layer_relation = (int32_t) (_in->layer() - _out->layer()); - - if (new_layer_relation * layer_relation < 0) { // different sign, layers rotated - Invalidated (shared_from_this ()); - return false; - } - - OverlapType ot = _in->coverage (_out->first_frame(), _out->last_frame()); - - if (ot == OverlapNone) { - Invalidated (shared_from_this ()); - return false; - } - - bool send_signal; - - if (ot != overlap_type) { - - if (_follow_overlap) { - - try { - compute (_in, _out, _session.config.get_xfade_model()); - } - - catch (NoCrossfadeHere& err) { - Invalidated (shared_from_this ()); - return false; - } - - send_signal = true; - - } else { - Invalidated (shared_from_this ()); - return false; - } - - } else { - - send_signal = update (); - } - - if (send_signal) { - PropertyChange bounds; - bounds.add (Properties::start); - bounds.add (Properties::position); - bounds.add (Properties::length); - PropertyChanged (bounds); /* EMIT SIGNAL */ - } - - _in_update = false; - - return true; -} - -bool -Crossfade::update () -{ - framecnt_t newlen; - - if (_follow_overlap) { - newlen = _out->first_frame() + _out->length() - _in->first_frame(); - } else { - newlen = _length; - } - - if (newlen == 0) { - Invalidated (shared_from_this ()); - return false; - } - - _in_update = true; - - if ((_follow_overlap && newlen != _length) || (_length > newlen)) { - - double factor = newlen / (double) _length; - - _fade_out.x_scale (factor); - _fade_in.x_scale (factor); - - _length = newlen; - } - - switch (_anchor_point) { - case StartOfIn: - _position = _in->first_frame(); - break; - - case EndOfIn: - _position = _in->last_frame() - _length; - break; - - case EndOfOut: - _position = _out->last_frame() - _length; - } - - return true; -} - -int -Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioRegion> b, CrossfadeModel model) -{ - boost::shared_ptr<AudioRegion> top; - boost::shared_ptr<AudioRegion> bottom; - framecnt_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; - } - - set_xfade_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(); - set_xfade_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; - _anchor_point = EndOfOut; - - if (model == FullCrossfade) { - _position = bottom->first_frame(); // "{" - set_xfade_length (_out->first_frame() + _out->length() - _in->first_frame()); - /* leave active alone */ - _follow_overlap = true; - } else { - set_xfade_length (min (short_xfade_length, top->length())); - _position = top->last_frame() - _length; // "]" - 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) { - set_xfade_length (_out->first_frame() + _out->length() - _in->first_frame()); - /* leave active alone */ - _follow_overlap = true; - } else { - set_xfade_length (min (short_xfade_length, top->length())); - _active = true; - _follow_overlap = false; - - } - - break; - } - } - - return 0; -} - -XMLNode& -Crossfade::get_state () -{ - XMLNode* node = new XMLNode (X_("Crossfade")); - XMLNode* child; - char buf[64]; - LocaleGuard lg (X_("POSIX")); - - id().print (buf, sizeof (buf)); - node->add_property ("id", buf); - _out->id().print (buf, sizeof (buf)); - node->add_property ("out", buf); - _in->id().print (buf, sizeof (buf)); - 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), "%" PRId64, _length.val()); - node->add_property ("length", buf); - snprintf (buf, sizeof(buf), "%" PRIu32, (uint32_t) _anchor_point); - node->add_property ("anchor-point", buf); - snprintf (buf, sizeof(buf), "%" PRId64, _position.val()); - 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), "%" PRId64, (framepos_t) floor ((*ii)->when)); - pnode->add_property ("x", buf); - snprintf (buf, sizeof (buf), "%.12g", (*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), "%" PRId64, (framepos_t) floor ((*ii)->when)); - pnode->add_property ("x", buf); - snprintf (buf, sizeof (buf), "%.12g", (*ii)->value); - pnode->add_property ("y", buf); - child->add_child_nocopy (*pnode); - } - - return *node; -} - -int -Crossfade::set_state (const XMLNode& node, int /*version*/) -{ - XMLNodeConstIterator i; - XMLNodeList children; - XMLNode* fi; - XMLNode* fo; - const XMLProperty* prop; - LocaleGuard lg (X_("POSIX")); - PropertyChange what_changed; - framepos_t val; - - set_id (node); - - if ((prop = node.property ("position")) != 0) { - sscanf (prop->value().c_str(), "%" PRId64, &val); - if (val != _position) { - _position = val; - what_changed.add (Properties::position); - } - } else { - warning << _("old-style crossfade information - no position information") << endmsg; - _position = _in->first_frame(); - } - - if ((prop = node.property ("active")) != 0) { - bool x = string_is_affirmative (prop->value()); - if (x != _active) { - _active = x; - what_changed.add (Properties::active); - } - } else { - _active = true; - } - - if ((prop = node.property ("follow-overlap")) != 0) { - _follow_overlap = string_is_affirmative (prop->value()); - } else { - _follow_overlap = false; - } - - if ((prop = node.property ("fixed")) != 0) { - _fixed = string_is_affirmative (prop->value()); - } 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) { - - sscanf (prop->value().c_str(), "%" PRId64, &val); - if (val != _length) { - _length = val; - what_changed.add (Properties::length); - } - - } 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.freeze (); - _fade_in.clear (); - - children = fi->children(); - - for (i = children.begin(); i != children.end(); ++i) { - if ((*i)->name() == "point") { - framepos_t x; - float y; - - prop = (*i)->property ("x"); - sscanf (prop->value().c_str(), "%" PRId64, &x); - - prop = (*i)->property ("y"); - sscanf (prop->value().c_str(), "%f", &y); - - _fade_in.add (x, y); - } - } - - if (_fade_in.size() < 2) { - /* fade state somehow saved with no points */ - return -1; - } - - _fade_in.front()->value = 0.0; - _fade_in.back()->value = 1.0; - - _fade_in.thaw (); - - /* fade out */ - - _fade_out.freeze (); - _fade_out.clear (); - - children = fo->children(); - - for (i = children.begin(); i != children.end(); ++i) { - if ((*i)->name() == "point") { - framepos_t x; - float y; - XMLProperty* prop; - - prop = (*i)->property ("x"); - sscanf (prop->value().c_str(), "%" PRId64, &x); - - prop = (*i)->property ("y"); - sscanf (prop->value().c_str(), "%f", &y); - - _fade_out.add (x, y); - } - } - - if (_fade_out.size() < 2) { - /* fade state somehow saved with no points */ - return -1; - } - - _fade_out.front()->value = 1.0; - _fade_out.back()->value = 0.0; - - _fade_out.thaw (); - - PropertyChanged (what_changed); /* EMIT SIGNAL */ - FadesChanged (); /* EMIT SIGNAL */ - - 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_xfade_length (_short_xfade_length); - } else { - set_xfade_length (_out->first_frame() + _out->length() - _in->first_frame()); - } - - PropertyChanged (PropertyChange (Properties::follow_overlap)); -} - -framecnt_t -Crossfade::set_xfade_length (framecnt_t len) -{ - framecnt_t limit = 0; - - 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; - - PropertyChanged (PropertyChange (Properties::length)); - - return len; -} - -framecnt_t -Crossfade::overlap_length () const -{ - if (_fixed) { - return _length; - } - return _out->first_frame() + _out->length() - _in->first_frame(); -} - -void -Crossfade::set_short_xfade_length (framecnt_t n) -{ - _short_xfade_length = n; -} |