2 Copyright (C) 2004 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <pbd/basename.h>
25 #include <ardour/types.h>
26 #include <ardour/reverse.h>
27 #include <ardour/audiofilesource.h>
28 #include <ardour/session.h>
29 #include <ardour/audioregion.h>
34 using namespace ARDOUR;
36 Reverse::Reverse (Session& s)
46 Reverse::run (boost::shared_ptr<AudioRegion> region)
49 SourceList::iterator si;
50 const nframes_t blocksize = 256 * 1048;
51 Sample buf[blocksize];
58 /* create new sources */
60 if (make_new_sources (region, nsrcs)) {
64 fend = region->start() + region->length();
65 fstart = region->start();
67 if (blocksize < fend) {
68 fpos =max(fstart, fend - blocksize);
73 to_read = min (region->length(), blocksize);
75 /* now read it backwards */
81 for (n = 0, si = nsrcs.begin(); n < region->n_channels(); ++n, ++si) {
85 if (region->source (n)->read (buf, fpos, to_read) != to_read) {
89 /* swap memory order */
91 for (nframes_t i = 0; i < to_read/2; ++i) {
92 swap (buf[i],buf[to_read-1-i]);
97 if ((*si)->write (buf, to_read) != to_read) {
102 if (fpos == fstart) {
104 } else if (fpos > fstart + to_read) {
106 to_read = min (fstart - fpos, blocksize);
108 to_read = fpos-fstart;
113 ret = finish (region, nsrcs);
118 for (si = nsrcs.begin(); si != nsrcs.end(); ++si) {
119 (*si)->mark_for_remove ();