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livetrax/libs/ardour/crossfade.cc
Paul Davis ede4ecbb00 megaopus patch #2 for today: remove nframes64_t and sframes_t from source 
git-svn-id: svn://localhost/ardour2/branches/3.0@7792 d708f5d6-7413-0410-9779-e7cbd77b26cf
2010-09-17 18:20:37 +00:00

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/*
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 "pbd/stacktrace.h"
#include "ardour/debug.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 "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,
framepos_t position,
AnchorPoint ap)
: AudioRegion (in->session(), position, 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
{
_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
{
_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
{
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, true)
, CROSSFADE_DEFAULT_PROPERTIES
, _fade_in (orig->_fade_in)
, _fade_out (orig->_fade_out)
{
_active = orig->_active;
_in_update = orig->_in_update;
_anchor_point = orig->_anchor_point;
_follow_overlap = orig->_follow_overlap;
_fixed = orig->_fixed;
_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::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, framecnt_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, cnt);
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,
framecnt_t read_frames, framecnt_t skip_frames) 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, 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.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;
}
/* 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;
}
_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;
_anchor_point = EndOfOut;
if (model == FullCrossfade) {
_position = bottom->first_frame(); // "{"
_length = _out->first_frame() + _out->length() - _in->first_frame();
/* leave active alone */
_follow_overlap = true;
} else {
_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) {
_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;
}
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;
if ((prop = node.property (X_("id")))) {
_id = prop->value();
}
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);
}
}
_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);
}
}
_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;
}
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