libardour added.

git-svn-id: svn://localhost/trunk/ardour2@17 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 125 insertions, 0 deletions

diff --git a/libs/ardour/reverse.cc b/libs/ardour/reverse.cc
new file mode 100644
index 0000000000..2474e0cb8d
--- /dev/null
+++ b/libs/ardour/reverse.cc
@@ -0,0 +1,125 @@
+/*
+    Copyright (C) 2004 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.
+
+    $Id$
+*/
+
+#include <algorithm>
+
+#include <pbd/basename.h>
+
+#include <ardour/types.h>
+#include <ardour/reverse.h>
+#include <ardour/filesource.h>
+#include <ardour/session.h>
+#include <ardour/audioregion.h>
+
+#include "i18n.h"
+
+using namespace std;
+using namespace ARDOUR;
+
+Reverse::Reverse (Session& s)
+	: AudioFilter (s)
+{
+}
+
+Reverse::~Reverse ()
+{
+}
+
+int
+Reverse::run (AudioRegion& region)
+{
+	AudioRegion::SourceList nsrcs;
+	AudioRegion::SourceList::iterator si;
+	const jack_nframes_t blocksize = 256 * 1048;
+	Sample buf[blocksize];
+	jack_nframes_t fpos;
+	jack_nframes_t fend;
+	jack_nframes_t fstart;
+	jack_nframes_t to_read;
+	int ret = -1;
+
+	/* create new sources */
+
+	if (make_new_sources (region, nsrcs)) {
+		goto out;
+	}
+
+	fend = region.start() + region.length();
+	fstart = region.start();
+
+	if (blocksize < fend) {
+		fpos =max(fstart, fend - blocksize);
+	} else {
+		fpos = fstart;
+	}
+
+	to_read = min (region.length(), blocksize);
+
+	/* now read it backwards */
+
+	while (1) {
+
+		uint32_t n;
+
+		for (n = 0, si = nsrcs.begin(); n < region.n_channels(); ++n, ++si) {
+
+			/* read it in */
+			
+			if (region.source (n).read (buf, fpos, to_read) != to_read) {
+				goto out;
+			}
+			
+			/* swap memory order */
+			
+			for (jack_nframes_t i = 0; i < to_read/2; ++i) {
+				swap (buf[i],buf[to_read-1-i]);
+			}
+			
+			/* write it out */
+
+			if ((*si)->write (buf, to_read) != to_read) {
+				goto out;
+			}
+		}
+
+		if (fpos == fstart) {
+			break;
+		} else if (fpos > fstart + to_read) {
+			fpos -= to_read;
+			to_read = min (fstart - fpos, blocksize);
+		} else {
+			to_read = fpos-fstart;
+			fpos = fstart;
+		}
+	};
+
+	ret = finish (region, nsrcs);
+
+  out:
+
+	if (ret) {
+		for (si = nsrcs.begin(); si != nsrcs.end(); ++si) {
+			(*si)->mark_for_remove ();
+			delete *si;
+		}
+	}
+
+	return ret;
+}