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.
22 #include "pbd/basename.h"
24 #include "ardour/types.h"
25 #include "ardour/reverse.h"
26 #include "ardour/audiofilesource.h"
27 #include "ardour/session.h"
28 #include "ardour/audioregion.h"
33 using namespace ARDOUR;
35 Reverse::Reverse (Session& s)
45 Reverse::run (boost::shared_ptr<Region> r, Progress*)
48 SourceList::iterator si;
49 framecnt_t blocksize = 256 * 1024;
56 boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion>(r);
60 /* create new sources */
62 if (make_new_sources (region, nsrcs)) {
66 fstart = region->start();
68 if (blocksize > region->length()) {
69 blocksize = region->length();
72 fpos = max (fstart, (fstart + region->length() - blocksize));
74 buf = new Sample[blocksize];
77 /* now read it backwards */
83 for (n = 0, si = nsrcs.begin(); n < region->n_channels(); ++n, ++si) {
85 /* read it in directly from the source */
87 if (region->audio_source (n)->read (buf, fpos, to_read) != to_read) {
91 /* swap memory order */
93 for (framecnt_t i = 0; i < to_read/2; ++i) {
94 swap (buf[i],buf[to_read-1-i]);
99 boost::shared_ptr<AudioSource> asrc(boost::dynamic_pointer_cast<AudioSource>(*si));
101 if (asrc && asrc->write (buf, to_read) != to_read) {
106 if (fpos > fstart + blocksize) {
110 to_read = fpos - fstart;
115 ret = finish (region, nsrcs);
122 for (si = nsrcs.begin(); si != nsrcs.end(); ++si) {
123 boost::shared_ptr<AudioSource> asrc(boost::dynamic_pointer_cast<AudioSource>(*si));
124 asrc->mark_for_remove ();