132 lines
2.8 KiB
C++
132 lines
2.8 KiB
C++
/*
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* Copyright (C) 2006-2012 David Robillard <d@drobilla.net>
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* Copyright (C) 2008-2010 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2008-2017 Paul Davis <paul@linuxaudiosystems.com>
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*
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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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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <algorithm>
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#include "ardour/audioregion.h"
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#include "ardour/audiosource.h"
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#include "ardour/reverse.h"
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#include "ardour/types.h"
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using namespace std;
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using namespace ARDOUR;
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namespace ARDOUR {
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class Session;
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}
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Reverse::Reverse (Session& s)
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: Filter (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 (std::shared_ptr<Region> r, PBD::Progress*)
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{
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SourceList nsrcs;
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SourceList::iterator si;
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samplecnt_t blocksize = 256 * 1024;
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Sample* buf = 0;
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samplepos_t fpos;
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samplepos_t fstart;
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samplecnt_t to_read;
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int ret = -1;
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std::shared_ptr<AudioRegion> region = std::dynamic_pointer_cast<AudioRegion>(r);
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if (!region) {
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return ret;
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}
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/* create new sources */
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if (make_new_sources (region, nsrcs, "", false)) {
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goto out;
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}
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fstart = region->start_sample();
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if (blocksize > region->length_samples()) {
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blocksize = region->length_samples();
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}
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fpos = max (fstart, (fstart + region->length_samples() - blocksize));
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buf = new Sample[blocksize];
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to_read = blocksize;
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/* now read it backwards */
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while (to_read) {
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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 directly from the source */
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if (region->audio_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 (samplecnt_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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std::shared_ptr<AudioSource> asrc(std::dynamic_pointer_cast<AudioSource>(*si));
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if (asrc && asrc->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 + blocksize) {
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fpos -= to_read;
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to_read = 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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delete [] buf;
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if (ret) {
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for (si = nsrcs.begin(); si != nsrcs.end(); ++si) {
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std::shared_ptr<AudioSource> asrc(std::dynamic_pointer_cast<AudioSource>(*si));
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asrc->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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