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124 lines
2.4 KiB
C++
124 lines
2.4 KiB
C++
/*
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Copyright (C) 2004 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include <algorithm>
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#include <pbd/basename.h>
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#include <ardour/types.h>
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#include <ardour/reverse.h>
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#include <ardour/audiofilesource.h>
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#include <ardour/session.h>
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#include <ardour/audioregion.h>
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#include "i18n.h"
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using namespace std;
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using namespace ARDOUR;
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Reverse::Reverse (Session& s)
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: AudioFilter (s)
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{
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}
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Reverse::~Reverse ()
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{
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}
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int
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Reverse::run (boost::shared_ptr<AudioRegion> region)
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{
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SourceList nsrcs;
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SourceList::iterator si;
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const nframes_t blocksize = 256 * 1048;
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Sample buf[blocksize];
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nframes_t fpos;
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nframes_t fend;
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nframes_t fstart;
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nframes_t to_read;
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int ret = -1;
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/* create new sources */
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if (make_new_sources (region, nsrcs)) {
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goto out;
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}
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fend = region->start() + region->length();
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fstart = region->start();
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if (blocksize < fend) {
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fpos =max(fstart, fend - blocksize);
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} else {
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fpos = fstart;
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}
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to_read = min (region->length(), blocksize);
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/* now read it backwards */
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while (1) {
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uint32_t n;
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for (n = 0, si = nsrcs.begin(); n < region->n_channels(); ++n, ++si) {
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/* read it in */
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if (region->source (n)->read (buf, fpos, to_read) != to_read) {
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goto out;
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}
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/* swap memory order */
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for (nframes_t i = 0; i < to_read/2; ++i) {
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swap (buf[i],buf[to_read-1-i]);
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}
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/* write it out */
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if ((*si)->write (buf, to_read) != to_read) {
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goto out;
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}
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}
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if (fpos == fstart) {
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break;
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} else if (fpos > fstart + to_read) {
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fpos -= to_read;
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to_read = min (fstart - fpos, blocksize);
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} else {
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to_read = fpos-fstart;
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fpos = fstart;
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}
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};
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ret = finish (region, nsrcs);
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out:
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if (ret) {
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for (si = nsrcs.begin(); si != nsrcs.end(); ++si) {
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(*si)->mark_for_remove ();
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}
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}
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return ret;
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}
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