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livetrax/libs/ardour/ebur128_analysis.cc

115 lines
2.5 KiB
C++

/*
Copyright (C) 2015 Robin Gareus
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 <cmath>
#include <cstring>
#include "ardour/ebur128_analysis.h"
#include "pbd/i18n.h"
using namespace Vamp;
using namespace ARDOUR;
using namespace std;
/* need a static initializer function for this */
EBUr128Analysis::EBUr128Analysis (float sr)
: AudioAnalyser (sr, X_("libardourvampplugins:ebur128"))
, _loudness (0)
, _loudness_range (0)
{
}
EBUr128Analysis::~EBUr128Analysis()
{
}
int
EBUr128Analysis::run (Readable* src)
{
int ret = -1;
bool done = false;
framecnt_t len = src->readable_length();
framepos_t pos = 0;
uint32_t n_channels = src->n_channels();
Plugin::FeatureSet features;
plugin->reset ();
if (!plugin->initialise (n_channels, stepsize, bufsize)) {
return -1;
}
float** bufs = (float**) malloc(n_channels * sizeof(float*));
for (uint32_t c = 0; c < n_channels; ++c) {
bufs[c] = (float*) malloc(bufsize * sizeof(float));
}
while (!done) {
framecnt_t to_read;
to_read = min ((len - pos), (framecnt_t) bufsize);
for (uint32_t c = 0; c < n_channels; ++c) {
if (src->read (bufs[c], pos, to_read, c) != to_read) {
goto out;
}
/* zero fill buffer if necessary */
if (to_read != bufsize) {
memset (bufs[c] + to_read, 0, (bufsize - to_read) * sizeof (float));
}
}
plugin->process (bufs, RealTime::fromSeconds ((double) pos / sample_rate));
pos += min (stepsize, to_read);
if (pos >= len) {
done = true;
}
}
features = plugin->getRemainingFeatures ();
if (use_features (features, 0)) {
goto out;
}
ret = 0;
out:
for (uint32_t c = 0; c < n_channels; ++c) {
free (bufs[c]);
}
free (bufs);
return ret;
}
int
EBUr128Analysis::use_features (Plugin::FeatureSet& features, ostream* out)
{
if (features.empty() || features.size() != 2) {
return 0;
}
_loudness = features[0][0].values[0];
_loudness_range = features[1][0].values[0];
return 0;
}