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livetrax/libs/ardour/st_stretch.cc

208 lines
5.2 KiB
C++

/*
Copyright (C) 2004-2007 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.
*/
#include <algorithm>
#include <cmath>
#include "pbd/error.h"
#include "ardour/types.h"
#include "ardour/stretch.h"
#include "ardour/audiofilesource.h"
#include "ardour/session.h"
#include "ardour/audioregion.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace soundtouch;
STStretch::STStretch (Session& s, TimeFXRequest& req)
: Filter (s)
, tsr (req)
{
float percentage;
/* the soundtouch code wants a *tempo* change percentage, which is
of opposite sign to the length change.
*/
percentage = -tsr.time_fraction;
st.setSampleRate (s.frame_rate());
st.setChannels (1);
st.setTempoChange (percentage);
st.setPitchSemiTones (0);
st.setRateChange (0);
st.setSetting(SETTING_USE_QUICKSEEK, tsr.quick_seek);
st.setSetting(SETTING_USE_AA_FILTER, tsr.antialias);
}
STStretch::~STStretch ()
{
}
int
STStretch::run (boost::shared_ptr<Region> a_region, Progress* progress)
{
SourceList nsrcs;
framecnt_t total_frames;
framecnt_t done;
int ret = -1;
const framecnt_t bufsize = 16384;
gain_t *gain_buffer = 0;
Sample *buffer = 0;
char suffix[32];
string new_name;
string::size_type at;
progress->set_progress (0);
tsr.done = false;
boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion>(a_region);
total_frames = region->length() * region->n_channels();
done = 0;
/* the name doesn't need to be super-precise, but allow for 2 fractional
digits just to disambiguate close but not identical stretches.
*/
snprintf (suffix, sizeof (suffix), "@%d", (int) floor (tsr.time_fraction * 100.0f));
/* create new sources */
if (make_new_sources (region, nsrcs, suffix)) {
goto out;
}
gain_buffer = new gain_t[bufsize];
buffer = new Sample[bufsize];
// soundtouch throws runtime_error on error
try {
for (uint32_t i = 0; i < nsrcs.size(); ++i) {
boost::shared_ptr<AudioSource> asrc
= boost::dynamic_pointer_cast<AudioSource>(nsrcs[i]);
framepos_t pos = 0;
framecnt_t this_read = 0;
st.clear();
while (!tsr.cancel && pos < region->length()) {
framecnt_t this_time;
this_time = min (bufsize, region->length() - pos);
/* read from the master (original) sources for the region,
not the ones currently in use, in case it's already been
subject to timefx.
*/
if ((this_read = region->master_read_at (buffer, buffer, gain_buffer, pos + region->position(), this_time)) != this_time) {
error << string_compose (_("tempoize: error reading data from %1"), asrc->name()) << endmsg;
goto out;
}
pos += this_read;
done += this_read;
progress->set_progress ((float) done / total_frames);
st.putSamples (buffer, this_read);
while ((this_read = st.receiveSamples (buffer, bufsize)) > 0 && !tsr.cancel) {
if (asrc->write (buffer, this_read) != this_read) {
error << string_compose (_("error writing tempo-adjusted data to %1"), asrc->name()) << endmsg;
goto out;
}
}
}
if (!tsr.cancel) {
st.flush ();
}
while (!tsr.cancel && (this_read = st.receiveSamples (buffer, bufsize)) > 0) {
if (asrc->write (buffer, this_read) != this_read) {
error << string_compose (_("error writing tempo-adjusted data to %1"), asrc->name()) << endmsg;
goto out;
}
}
}
} catch (runtime_error& err) {
error << _("timefx code failure. please notify ardour-developers.") << endmsg;
error << err.what() << endmsg;
goto out;
}
new_name = region->name();
at = new_name.find ('@');
// remove any existing stretch indicator
if (at != string::npos && at > 2) {
new_name = new_name.substr (0, at - 1);
}
new_name += suffix;
ret = finish (region, nsrcs, new_name);
/* now reset ancestral data for each new region */
for (vector<boost::shared_ptr<Region> >::iterator x = results.begin(); x != results.end(); ++x) {
framepos_t astart = (*x)->ancestral_start();
framepos_t alength = (*x)->ancestral_length();
framepos_t start;
framecnt_t length;
// note: tsr.fraction is a percentage of original length. 100 = no change,
// 50 is half as long, 200 is twice as long, etc.
float stretch = (*x)->stretch() * (tsr.time_fraction/100.0);
start = (framepos_t) floor (astart + ((astart - (*x)->start()) / stretch));
length = (framecnt_t) floor (alength / stretch);
(*x)->set_ancestral_data (start, length, stretch, (*x)->shift());
}
out:
delete [] gain_buffer;
delete [] buffer;
if (ret || tsr.cancel) {
for (SourceList::iterator si = nsrcs.begin(); si != nsrcs.end(); ++si) {
(*si)->mark_for_remove ();
}
}
return ret;
}