rollback to 3428, before the mysterious removal of libs/* at 3431/3432

[ardour.git] / libs / ardour / transient_detector.cc

diff --git a/libs/ardour/transient_detector.cc b/libs/ardour/transient_detector.cc
new file mode 100644 (file)
index 0000000..d3200d7
--- /dev/null
+++ b/libs/ardour/transient_detector.cc
@@ -0,0 +1,118 @@
+#include <ardour/transient_detector.h>
+
+#include "i18n.h"
+
+using namespace Vamp;
+using namespace ARDOUR;
+using namespace std;
+
+/* need a static initializer function for this */
+
+string TransientDetector::_op_id = X_("libardourvampplugins:percussiononsets:2");
+
+TransientDetector::TransientDetector (float sr)
+       : AudioAnalyser (sr, X_("libardourvampplugins:percussiononsets"))
+{
+       /* update the op_id */
+
+       _op_id = X_("libardourvampplugins:percussiononsets");
+       
+       // XXX this should load the above-named plugin and get the current version
+       
+       _op_id += ":2";
+}
+
+TransientDetector::~TransientDetector()
+{
+}
+
+string
+TransientDetector::operational_identifier()
+{
+       return _op_id;
+}
+
+int
+TransientDetector::run (const std::string& path, Readable* src, uint32_t channel, AnalysisFeatureList& results)
+{
+       current_results = &results;
+       int ret = analyse (path, src, channel);
+
+       current_results = 0;
+       return ret;
+}
+
+int
+TransientDetector::use_features (Plugin::FeatureSet& features, ostream* out)
+{
+       const Plugin::FeatureList& fl (features[0]);
+
+       for (Plugin::FeatureList::const_iterator f = fl.begin(); f != fl.end(); ++f) {
+               
+               if ((*f).hasTimestamp) {
+
+                       if (out) {
+                               (*out) << (*f).timestamp.toString() << endl;
+                       } 
+                       
+                       current_results->push_back (RealTime::realTime2Frame ((*f).timestamp, (nframes_t) floor(sample_rate)));
+               }
+       }
+
+       return 0;
+}
+
+void
+TransientDetector::set_threshold (float val)
+{
+       if (plugin) {
+               plugin->setParameter ("threshold", val);
+       }
+}
+
+void
+TransientDetector::set_sensitivity (float val)
+{
+       if (plugin) {
+               plugin->setParameter ("sensitivity", val);
+       }
+}
+
+void
+TransientDetector::cleanup_transients (AnalysisFeatureList& t, float sr, float gap_msecs)
+{
+       if (t.empty()) {
+               return;
+       }
+
+       t.sort ();
+       
+       /* remove duplicates or other things that are too close */
+       
+       AnalysisFeatureList::iterator i = t.begin();
+       AnalysisFeatureList::iterator f, b;
+       const nframes64_t gap_frames = (nframes64_t) floor (gap_msecs * (sr / 1000.0));
+       
+       while (i != t.end()) {
+
+               // move front iterator to just past i, and back iterator the same place
+               
+               f = i;
+               ++f;
+               b = f;
+
+               // move f until we find a new value that is far enough away
+               
+               while ((f != t.end()) && (((*f) - (*i)) < gap_frames)) {
+                       ++f;
+               }
+
+               i = f;
+
+               // if f moved forward from b, we had duplicates/too-close points: get rid of them
+
+               if (b != f) {
+                       t.erase (b, f);
+               }
+       }
+}