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Support backwards play, a requirement for scrubbing

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Uncomment the line at the top of ControlToolBar::PlayPlayRegion to play
everything backwards and test it

It even works correctly with a time track
This commit is contained in:
Paul-Licameli
2015-04-16 17:35:58 -04:00
parent 2b85d0edb4
commit 5abfd25a34
8 changed files with 256 additions and 109 deletions
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26
src/toolbars/ControlToolBar.cpp
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@@ -473,13 +473,17 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
bool cutpreview, /* = false */
bool backwards /* = false */)
{
// Uncomment this for laughs!
// backwards = true;
double t0 = selectedRegion.t0();
double t1 = selectedRegion.t1();
// SelectedRegion guarantees t0 <= t1, so we need another boolean argument
// to indicate backwards play.
const bool looped = options.playLooped;
wxASSERT(! backwards);
if (backwards)
std::swap(t0, t1);
SetPlay(true, looped, cutpreview);
@@ -555,7 +559,9 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
t1 = t->GetEndTime();
}
else {
// always t0 < t1 right?
// maybe t1 < t0, with backwards scrubbing for instance
if (backwards)
std::swap(t0, t1);
// the set intersection between the play region and the
// valid range maximum of lower bounds
@@ -579,6 +585,9 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
t0 = maxofmins;
t1 = minofmaxs;
}
if (backwards)
std::swap(t0, t1);
}
// Can't play before 0...either shifted or latency corrected tracks
@@ -589,14 +598,19 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
int token = -1;
bool success = false;
if (t1 > t0) {
if (t1 != t0) {
if (cutpreview) {
const double tless = std::min(t0, t1);
const double tgreater = std::max(t0, t1);
double beforeLen, afterLen;
gPrefs->Read(wxT("/AudioIO/CutPreviewBeforeLen"), &beforeLen, 2.0);
gPrefs->Read(wxT("/AudioIO/CutPreviewAfterLen"), &afterLen, 1.0);
double tcp0 = t0-beforeLen;
double tcp1 = (t1+afterLen) - (t1-t0);
SetupCutPreviewTracks(tcp0, t0, t1, tcp1);
double tcp0 = tless-beforeLen;
double diff = tgreater - tless;
double tcp1 = (tgreater+afterLen) - diff;
SetupCutPreviewTracks(tcp0, tless, tgreater, tcp1);
if (backwards)
std::swap(tcp0, tcp1);
if (mCutPreviewTracks)
{
AudioIOStartStreamOptions myOptions = options;