Manual merge of the backend (peakfile reading) part of waveview branch.

Summary:
    * use mmap() for the whole peakfile instead of lots of small seek/reads
    * cache the computed peaks
    * where possible, open files with O_NOATIME.

1 files changed, 7 insertions, 0 deletions

diff --git a/libs/ardour/ardour/audiosource.h b/libs/ardour/ardour/audiosource.h
index 622bc6052a..095d9d2169 100644
--- a/libs/ardour/ardour/audiosource.h
+++ b/libs/ardour/ardour/audiosource.h
@@ -28,6 +28,7 @@
 
 #include <glibmm/threads.h>
 #include <boost/function.hpp>
+#include <boost/scoped_array.hpp>
 
 #include "ardour/source.h"
 #include "ardour/ardour.h"
@@ -164,6 +165,12 @@ class LIBARDOUR_API AudioSource : virtual public Source,
 	framecnt_t peak_leftover_size;
 	Sample*    peak_leftovers;
 	framepos_t peak_leftover_frame;
+
+	mutable bool _first_run;
+	mutable double _last_scale;
+	mutable off_t _last_map_off;
+	mutable size_t  _last_raw_map_length;
+	mutable boost::scoped_array<PeakData> peak_cache;
 };
 
 }