audioanalyser.h

Go to the documentation of this file.

/*
 * Copyright (C) 2008-2010 David Robillard <d@drobilla.net>
 * Copyright (C) 2008-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2015-2016 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <vector>
#include <string>
#include <vamp-hostsdk/Plugin.h>
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
 
namespace ARDOUR {
 
class AudioReadable;
class Session;
 
class LIBARDOUR_API AudioAnalyser {
 
  public:
        typedef Vamp::Plugin AnalysisPlugin;
        typedef std::string AnalysisPluginKey;
 
        AudioAnalyser (float sample_rate, AnalysisPluginKey key);
        AudioAnalyser (const AudioAnalyser&) = delete;
        AudioAnalyser& operator= (const AudioAnalyser&) = delete;
        virtual ~AudioAnalyser();
 
        /* analysis object should provide a run method
           that accepts a path to write the results to (optionally empty)
           a AudioReadable* to read data from
           and a reference to a type-specific container to return the
           results.
        */
 
        void reset ();
 
  protected:
        float sample_rate;
        AnalysisPlugin* plugin;
        AnalysisPluginKey plugin_key;
 
        samplecnt_t bufsize;
        samplecnt_t stepsize;
 
        int initialize_plugin (AnalysisPluginKey name, float sample_rate);
        int analyse (const std::string& path, AudioReadable*, uint32_t channel);
 
        /* instances of an analysis object will have this method called
           whenever there are results to process. if out is non-null,
           the data should be written to the stream it points to.
        */
 
        virtual int use_features (Vamp::Plugin::FeatureSet&, std::ostream*) = 0;
};
 
} /* namespace */