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-rw-r--r--libs/ardour/crossfade.cc904
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diff --git a/libs/ardour/crossfade.cc b/libs/ardour/crossfade.cc
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--- a/libs/ardour/crossfade.cc
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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 <sigc++/bind.h>
-
-#include <pbd/stacktrace.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 "i18n.h"
-#include <locale.h>
-
-using namespace std;
-using namespace ARDOUR;
-using namespace PBD;
-
-nframes_t Crossfade::_short_xfade_length = 0;
-Change Crossfade::ActiveChanged = new_change();
-Change Crossfade::FollowOverlapChanged = 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 (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 (boost::shared_ptr<AudioRegion> in, boost::shared_ptr<AudioRegion> out,
- nframes_t length,
- nframes_t position,
- AnchorPoint ap)
- : AudioRegion (in->session(), position, length, "foobar"),
- _fade_in (Parameter(FadeInAutomation), 0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
- _fade_out (Parameter(FadeOutAutomation), 0.0, 2.0, 1.0) // linear (gain coefficient) => -inf..+6dB
-
-{
- _in = in;
- _out = out;
-
- _anchor_point = ap;
- _follow_overlap = false;
-
- _active = Config->get_xfades_active ();
- _fixed = true;
-
- initialize ();
-}
-
-Crossfade::Crossfade (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioRegion> b, CrossfadeModel model, bool act)
- : AudioRegion (a->session(), 0, 0, "foobar"),
- _fade_in (Parameter(FadeInAutomation), 0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
- _fade_out (Parameter(FadeOutAutomation), 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)
- : AudioRegion (playlist.session(), 0, 0, "foobar"),
- _fade_in (Parameter(FadeInAutomation), 0.0, 2.0, 1.0), // linear (gain coefficient) => -inf..+6dB
- _fade_out (Parameter(FadeOutAutomation), 0.0, 2.0, 1.0) // linear (gain coefficient) => -inf..+6dB
-
-{
- boost::shared_ptr<Region> r;
- XMLProperty* 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());
-
- if ((r = playlist.find_region (id)) == 0) {
- error << string_compose (_("Crossfade: no \"in\" region %1 found in playlist %2"), 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());
-
- if ((r = playlist.find_region (id2)) == 0) {
- error << string_compose (_("Crossfade: no \"out\" region %1 found in playlist %2"), 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)) {
- 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)),
- _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_length(_length);
-}
-
-
-Crossfade::~Crossfade ()
-{
- notify_callbacks ();
-}
-
-void
-Crossfade::initialize ()
-{
- /* merge source lists from regions */
-
- _sources = _in->sources();
- _sources.insert (_sources.end(), _out->sources().begin(), _out->sources().end());
- _master_sources = _in->master_sources();
- _master_sources.insert(_master_sources.end(), _out->master_sources().begin(), _out->master_sources().end());
-
- _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 ();
-
- overlap_type = _in->coverage (_out->position(), _out->last_frame());
- layer_relation = (int32_t) (_in->layer() - _out->layer());
-}
-
-nframes_t
-Crossfade::read_raw_internal (Sample* buf, nframes_t start, nframes_t cnt) const
-{
-#if 0
- Sample* mixdown = new Sample[cnt];
- float* gain = new float[cnt];
- nframes_t ret;
-
- ret = read_at (buf, mixdown, gain, start, cnt, chan_n, cnt);
-
- delete [] mixdown;
- delete [] gain;
-
- return ret;
-#endif
- return cnt;
-}
-
-nframes_t
-Crossfade::read_at (Sample *buf, Sample *mixdown_buffer,
- float *gain_buffer, nframes_t start, nframes_t cnt, uint32_t chan_n,
- nframes_t read_frames, nframes_t skip_frames) const
-{
- nframes_t offset;
- 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;
-
- /* 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 (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 (nframes_t start, nframes_t end) const
-{
- 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;
- StateChanged (ActiveChanged);
- }
-}
-
-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, 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) {
- StateChanged (BoundsChanged); /* EMIT SIGNAL */
- }
-
- _in_update = false;
-
- return true;
-}
-
-bool
-Crossfade::update ()
-{
- nframes_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;
- 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;
- _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"));
-
- _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), "%" 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, (nframes_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), "%" PRIu32, (nframes_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)
-{
- XMLNodeConstIterator i;
- XMLNodeList children;
- XMLNode* fi;
- XMLNode* fo;
- const XMLProperty* prop;
- LocaleGuard lg (X_("POSIX"));
- Change what_changed = Change (0);
- nframes_t val;
-
- if ((prop = node.property ("position")) != 0) {
- sscanf (prop->value().c_str(), "%" PRIu32, &val);
- if (val != _position) {
- _position = val;
- what_changed = Change (what_changed | PositionChanged);
- }
- } else {
- warning << _("old-style crossfade information - no position information") << endmsg;
- _position = _in->first_frame();
- }
-
- if ((prop = node.property ("active")) != 0) {
- bool x = (prop->value() == "yes");
- if (x != _active) {
- _active = x;
- what_changed = Change (what_changed | ActiveChanged);
- }
- } 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) {
-
- sscanf (prop->value().c_str(), "%" PRIu32, &val);
- if (val != _length) {
- _length = atol (prop->value().c_str());
- what_changed = Change (what_changed | LengthChanged);
- }
-
- } 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") {
- 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_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") {
- 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);
- }
- }
-
- _fade_out.thaw ();
-
- StateChanged (what_changed); /* 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_length (_short_xfade_length);
- } else {
- set_length (_out->first_frame() + _out->length() - _in->first_frame());
- }
-
- StateChanged (FollowOverlapChanged);
-}
-
-nframes_t
-Crossfade::set_length (nframes_t len)
-{
- 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;
-
- StateChanged (LengthChanged);
-
- return len;
-}
-
-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 (nframes_t n)
-{
- _short_xfade_length = n;
-}
-
-void
-Crossfade::invalidate ()
-{
- Invalidated (shared_from_this ()); /* EMIT SIGNAL */
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-13 18:41:03 +0000