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/*
Copyright (C) 2012 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 <cstring>
#include <vamp-hostsdk/PluginLoader.h>
#include <glibmm/miscutils.h>
#include <glibmm/fileutils.h>
#include <glib/gstdio.h> // for g_remove()
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "ardour/audioanalyser.h"
#include "ardour/readable.h"
#include <cstring>
#include "i18n.h"
using namespace std;
using namespace Vamp;
using namespace PBD;
using namespace ARDOUR;
AudioAnalyser::AudioAnalyser (float sr, AnalysisPluginKey key)
: sample_rate (sr)
, plugin_key (key)
{
/* create VAMP plugin and initialize */
if (initialize_plugin (plugin_key, sample_rate)) {
error << string_compose (_("cannot load VAMP plugin \"%1\""), key) << endmsg;
throw failed_constructor();
}
}
AudioAnalyser::~AudioAnalyser ()
{
delete plugin;
}
int
AudioAnalyser::initialize_plugin (AnalysisPluginKey key, float sr)
{
using namespace Vamp::HostExt;
PluginLoader* loader (PluginLoader::getInstance());
plugin = loader->loadPlugin (key, sr, PluginLoader::ADAPT_ALL);
if (!plugin) {
error << string_compose (_("VAMP Plugin \"%1\" could not be loaded"), key) << endmsg;
return -1;
}
/* we asked for the buffering adapter, so set the blocksize to
something that makes for efficient disk i/o
*/
bufsize = 65536;
stepsize = bufsize;
if (plugin->getMinChannelCount() > 1) {
delete plugin;
return -1;
}
if (!plugin->initialise (1, stepsize, bufsize)) {
delete plugin;
return -1;
}
return 0;
}
void
AudioAnalyser::reset ()
{
if (plugin) {
plugin->reset ();
}
}
int
AudioAnalyser::analyse (const string& path, Readable* src, uint32_t channel)
{
ofstream ofile;
Plugin::FeatureSet features;
int ret = -1;
bool done = false;
Sample* data = 0;
framecnt_t len = src->readable_length();
framepos_t pos = 0;
float* bufs[1] = { 0 };
string tmp_path;
if (!path.empty()) {
/* store data in tmp file, not the real one */
tmp_path = path;
tmp_path += ".tmp";
ofile.open (tmp_path.c_str());
if (!ofile) {
goto out;
}
}
data = new Sample[bufsize];
bufs[0] = data;
while (!done) {
framecnt_t to_read;
/* read from source */
to_read = min ((len - pos), (framecnt_t) bufsize);
if (src->read (data, pos, to_read, channel) != to_read) {
goto out;
}
/* zero fill buffer if necessary */
if (to_read != bufsize) {
memset (data + to_read, 0, (bufsize - to_read) * sizeof (Sample));
}
features = plugin->process (bufs, RealTime::fromSeconds ((double) pos / sample_rate));
if (use_features (features, (path.empty() ? 0 : &ofile))) {
goto out;
}
pos += min (stepsize, to_read);
if (pos >= len) {
done = true;
}
}
/* finish up VAMP plugin */
features = plugin->getRemainingFeatures ();
if (use_features (features, (path.empty() ? &ofile : 0))) {
goto out;
}
ret = 0;
out:
/* works even if it has not been opened */
ofile.close ();
if (ret) {
g_remove (tmp_path.c_str());
} else if (!path.empty()) {
/* move the data file to the requested path */
g_rename (tmp_path.c_str(), path.c_str());
}
delete [] data;
return ret;
}
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