diff options
Diffstat (limited to 'libs/ardour/crossfade.cc')
| -rw-r--r-- | libs/ardour/crossfade.cc | 156 |
1 files changed, 78 insertions, 78 deletions
diff --git a/libs/ardour/crossfade.cc b/libs/ardour/crossfade.cc index 2d46c0c01a..f12b32228d 100644 --- a/libs/ardour/crossfade.cc +++ b/libs/ardour/crossfade.cc @@ -1,5 +1,5 @@ /* - Copyright (C) 2003-2006 Paul Davis + 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 @@ -69,7 +69,7 @@ Crossfade::operator== (const Crossfade& other) return (_in == other._in) && (_out == other._out); } -Crossfade::Crossfade (boost::shared_ptr<AudioRegion> in, boost::shared_ptr<AudioRegion> out, +Crossfade::Crossfade (boost::shared_ptr<AudioRegion> in, boost::shared_ptr<AudioRegion> out, nframes_t length, nframes_t position, AnchorPoint ap) @@ -123,7 +123,7 @@ Crossfade::Crossfade (const Playlist& playlist, XMLNode& node) error << _("Crossfade: no \"in\" region in state") << endmsg; throw failed_constructor(); } - + PBD::ID id (prop->value()); if ((r = playlist.find_region (id)) == 0) { @@ -131,7 +131,7 @@ Crossfade::Crossfade (const Playlist& playlist, XMLNode& node) << endmsg; throw failed_constructor(); } - + if ((_in = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) { throw failed_constructor(); } @@ -148,7 +148,7 @@ Crossfade::Crossfade (const Playlist& playlist, XMLNode& node) << endmsg; throw failed_constructor(); } - + if ((_out = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) { throw failed_constructor(); } @@ -156,7 +156,7 @@ Crossfade::Crossfade (const Playlist& playlist, XMLNode& node) _length = 0; initialize(); _active = true; - + if (set_state (node)) { throw failed_constructor(); } @@ -172,13 +172,13 @@ Crossfade::Crossfade (boost::shared_ptr<Crossfade> orig, boost::shared_ptr<Audio _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 (); @@ -204,9 +204,9 @@ Crossfade::initialize () _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 (); @@ -236,7 +236,7 @@ Crossfade::initialize () #endif _fade_out.thaw (); - + _fade_in.freeze (); _fade_in.clear (); @@ -267,9 +267,9 @@ Crossfade::initialize () overlap_type = _in->coverage (_out->position(), _out->last_frame()); layer_relation = (int32_t) (_in->layer() - _out->layer()); -} +} -nframes_t +nframes_t Crossfade::read_raw_internal (Sample* /*buf*/, sframes_t /*start*/, nframes_t cnt, int /*channel*/) const { // FIXME: Why is this disabled? @@ -288,8 +288,8 @@ Crossfade::read_raw_internal (Sample* /*buf*/, sframes_t /*start*/, nframes_t cn return cnt; } -nframes_t -Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, +nframes_t +Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, float *gain_buffer, sframes_t start, nframes_t cnt, uint32_t chan_n, nframes_t read_frames, nframes_t skip_frames) const { @@ -313,15 +313,15 @@ Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, } else { return 0; } - + start = _position; buf += offset; to_write = min (_length, cnt); } else { - + to_write = min (nframes_t(_length - (start - _position)), cnt); - + } offset = start - _position; @@ -345,7 +345,7 @@ Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, /* 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. + position and length, and so we know precisely how much data they could return. */ for (nframes_t n = 0; n < to_write; ++n) { @@ -356,9 +356,9 @@ Crossfade::read_at (Sample *buf, Sample *mixdown_buffer, delete [] fiv; return to_write; -} +} -OverlapType +OverlapType Crossfade::coverage (nframes_t start, nframes_t end) const { nframes_t my_end = _position + _length; @@ -391,14 +391,14 @@ 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; @@ -418,7 +418,7 @@ Crossfade::refresh () if (ot == OverlapNone) { Invalidated (shared_from_this ()); return false; - } + } bool send_signal; @@ -428,7 +428,7 @@ Crossfade::refresh () try { compute (_in, _out, _session.config.get_xfade_model()); - } + } catch (NoCrossfadeHere& err) { Invalidated (shared_from_this ()); @@ -460,39 +460,39 @@ 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; } @@ -507,7 +507,7 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg boost::shared_ptr<AudioRegion> bottom; nframes_t short_xfade_length; - short_xfade_length = _short_xfade_length; + short_xfade_length = _short_xfade_length; if (a->layer() < b->layer()) { top = b; @@ -516,19 +516,19 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg 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 =====================} */ @@ -551,24 +551,24 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg } 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 =====================} */ @@ -581,7 +581,7 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg _anchor_point = StartOfIn; _active = true; _fixed = true; - + } else { /* top starts before bottom - no xfade */ @@ -594,7 +594,7 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg } } else { - + /* OK, time to do more regular overlapping */ OverlapType ot = top->coverage (bottom->first_frame(), bottom->last_frame()); @@ -606,18 +606,18 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg */ 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 ============ } - */ + /* [---- top ------------------------] + * { ==== bottom ============ } + */ _in = bottom; _out = top; @@ -630,17 +630,17 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg _follow_overlap = true; } else { _length = min (short_xfade_length, top->length()); - _position = top->last_frame() - _length; // "]" - 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 -------------------] + /* { ==== top ============ } + * [---- bottom -------------------] */ _in = top; @@ -656,18 +656,18 @@ Crossfade::compute (boost::shared_ptr<AudioRegion> a, boost::shared_ptr<AudioReg _length = min (short_xfade_length, top->length()); _active = true; _follow_overlap = false; - + } - + break; } } - + return 0; } XMLNode& -Crossfade::get_state () +Crossfade::get_state () { XMLNode* node = new XMLNode (X_("Crossfade")); XMLNode* child; @@ -779,11 +779,11 @@ Crossfade::set_state (const XMLNode& node) } } else { - + /* XXX this branch is legacy code from before the point where we stored xfade lengths. */ - + if ((_length = overlap_length()) == 0) { throw failed_constructor(); } @@ -792,26 +792,26 @@ Crossfade::set_state (const XMLNode& node) 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); @@ -820,14 +820,14 @@ Crossfade::set_state (const XMLNode& node) } _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; @@ -839,7 +839,7 @@ Crossfade::set_state (const XMLNode& node) prop = (*i)->property ("y"); sscanf (prop->value().c_str(), "%f", &y); - + _fade_out.add (x, y); } } @@ -892,7 +892,7 @@ Crossfade::set_xfade_length (nframes_t len) case EndOfOut: limit = _out->length(); break; - + } len = min (limit, len); @@ -903,7 +903,7 @@ Crossfade::set_xfade_length (nframes_t len) _fade_out.x_scale (factor); _fade_in.x_scale (factor); _in_update = false; - + _length = len; StateChanged (LengthChanged); |