diff options
Diffstat (limited to 'libs/ardour/ardour/graph.h')
-rw-r--r-- | libs/ardour/ardour/graph.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/libs/ardour/ardour/graph.h b/libs/ardour/ardour/graph.h new file mode 100644 index 0000000000..80b5a9fe11 --- /dev/null +++ b/libs/ardour/ardour/graph.h @@ -0,0 +1,101 @@ +/* + Copyright (C) 2008 Paul Davis + Author: Sakari Bergen + + 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. + +*/ + +#ifndef __ardour_graph_h__ +#define __ardour_graph_h__ + +#include <boost/shared_ptr.hpp> + +#include <ardour/types.h> + +namespace ARDOUR +{ + +/// Takes data in +template <typename T> +class GraphSink { + public: + GraphSink () : end_of_input (false) {} + virtual ~GraphSink () { end_of_input = false; } + + // writes data and return number of frames written + virtual nframes_t write (T * data, nframes_t frames) = 0; + + // Notifies end of input. All left over data must be written at this stage + virtual void set_end_of_input (bool state = true) + { + end_of_input = state; + } + + protected: + bool end_of_input; +}; + +/// is a source for data +template <typename T> +class GraphSource { + public: + GraphSource () {} + virtual ~GraphSource () {} + + virtual nframes_t read (T * data, nframes_t frames) = 0; +}; + +/// Takes data in, processes it and passes it on to another sink +template <typename TIn, typename TOut> +class GraphSinkVertex : public GraphSink<TIn> { + public: + GraphSinkVertex () {} + virtual ~GraphSinkVertex () {} + + void pipe_to (boost::shared_ptr<GraphSink<TOut> > dest) { + piped_to = dest; + } + + nframes_t write (TIn * data, nframes_t frames) + { + if (!piped_to) { + return -1; + } + return process (data, frames); + } + + virtual void set_end_of_input (bool state = true) + { + if (!piped_to) { + return; + } + piped_to->set_end_of_input (state); + GraphSink<TIn>::end_of_input = state; + } + + protected: + boost::shared_ptr<GraphSink<TOut> > piped_to; + + /* process must process data, + use piped_to->write to write the data + and return number of frames written */ + virtual nframes_t process (TIn * data, nframes_t frames) = 0; +}; + +} // namespace ARDOUR + +#endif /* __ardour_graph_h__ */ + |