public BpmDetector ()
{
try {
pipeline = new Pipeline ();
filesrc = new FileSrc ();
var decodebin = new DecodeBin2 ();
var audioconvert = Make ("audioconvert");
var bpmdetect = Make ("bpmdetect");
fakesink = new FakeSink ();
pipeline.Add (filesrc, decodebin, audioconvert, bpmdetect, fakesink);
if (!filesrc.Link (decodebin)) {
Log.Error ("Could not link pipeline elements");
throw new Exception ();
}
// decodebin and audioconvert are linked dynamically when the decodebin creates a new pad
decodebin.NewDecodedPad += delegate(object o, DecodeBin2.NewDecodedPadArgs args) {
var audiopad = audioconvert.GetStaticPad ("sink");
if (audiopad.IsLinked) {
return;
}
using (var caps = args.Pad.Caps) {
using (var str = caps[0]) {
if (!str.Name.Contains ("audio"))
return;
}
}
args.Pad.Link (audiopad);
};
if (!Element.Link (audioconvert, bpmdetect, fakesink)) {
Log.Error ("Could not link pipeline elements");
throw new Exception ();
}
pipeline.Bus.AddWatch (OnBusMessage);
//gst_bus_add_watch (gst_pipeline_get_bus (GST_PIPELINE (detector->pipeline)), bbd_pipeline_bus_callback, detector);
} catch (Exception e) {
Log.Exception (e);
throw new ApplicationException (Catalog.GetString ("Could not create BPM detection driver."), e);
}
}
private void ConstructPipeline() {
pipeline = new Pipeline ("pipeline");
filesrc = ElementFactory.Make ("filesrc", "filesrc") as FileSrc;
filesink = ElementFactory.Make ("filesink", "filesink") as FileSink;
audioconvert = ElementFactory.Make ("audioconvert", "audioconvert");
encoder = ElementFactory.Make ("wavenc", "wavenc");
decodebin = ElementFactory.Make ("decodebin2", "decodebin") as DecodeBin2;
decodebin.NewDecodedPad += OnNewDecodedPad;
pipeline.Add (filesrc, decodebin, audioconvert, encoder, filesink);
filesrc.Link (decodebin);
audioconvert.Link (encoder);
encoder.Link (filesink);
pipeline.Bus.AddWatch (new BusFunc (OnBusMessage));
}
private void OnNewDecodedPad (object o, DecodeBin2.NewDecodedPadArgs args) {
Pad sinkpad = audioconvert.GetStaticPad ("sink");
if (sinkpad.IsLinked) {
return;
}
Caps caps = args.Pad.Caps;
Structure structure = caps[0];
if (!structure.Name.StartsWith ("audio")) {
return;
}
args.Pad.Link (sinkpad);
}