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/*
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/audiofilesource.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 (boost::shared_ptr<AudioRegion> region)
{
SourceList nsrcs;
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;
}
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