initial volley of work for AudioPlaylistSource, the basic prototype for sources-that-are-nested

git-svn-id: svn://localhost/ardour2/branches/3.0@9507 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 72 insertions, 0 deletions

diff --git a/libs/ardour/ardour/audio_playlist_source.h b/libs/ardour/ardour/audio_playlist_source.h
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+++ b/libs/ardour/ardour/audio_playlist_source.h
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+/*
+    Copyright (C) 2011 Paul Davis
+
+    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_audio_playlist_source_h__
+#define __ardour_audio_playlist_source_h__
+
+#include <string>
+
+#include <boost/shared_ptr.hpp>
+
+#include "ardour/ardour.h"
+#include "ardour/audiosource.h"
+
+namespace ARDOUR {
+
+class AudioPlaylist;
+
+class AudioPlaylistSource : public AudioSource {
+  public:
+    virtual ~AudioPlaylistSource ();
+    
+    bool       empty() const;
+    std::string peak_path (std::string audio_path);
+    uint32_t   n_channels() const;
+    bool clamped_at_unity () const { return false; }
+
+    framecnt_t read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) const;
+    framecnt_t write_unlocked (Sample *src, framecnt_t cnt);
+    
+    float sample_rate () const;
+    int setup_peakfile ();
+    
+    XMLNode& get_state ();
+    int set_state (const XMLNode&, int version);
+    
+    bool can_truncate_peaks() const { return false; }
+    bool can_be_analysed() const    { return _length > 0; }
+    
+  protected:
+    friend class SourceFactory;
+
+    AudioPlaylistSource (Session&, const std::string& name, boost::shared_ptr<AudioPlaylist>, uint32_t chn,
+                         frameoffset_t begin, framecnt_t len, bool copy, Source::Flag flags);
+    AudioPlaylistSource (Session&, const XMLNode&);
+    
+  private:
+    boost::shared_ptr<AudioPlaylist> _playlist;
+    frameoffset_t                    _playlist_offset;
+    framecnt_t                       _playlist_length;
+    uint32_t                         _playlist_channel;
+    std::string                      _peak_path;
+};
+        
+} /* namespace */
+
+#endif /* __ardour_audio_playlist_source_h__ */