/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Vamp feature extraction plugins using Paul Brossier's Aubio library.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006-2008 Chris Cannam and QMUL.
This file is part of vamp-aubio-plugins.
vamp-aubio 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 3 of the License, or
(at your option) any later version.
vamp-aubio 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 aubio. If not, see .
*/
#include
#include "Silence.h"
using std::string;
using std::vector;
using std::cerr;
using std::endl;
Silence::Silence(float inputSampleRate) :
Plugin(inputSampleRate),
m_ibuf(0),
m_pbuf(0),
m_threshold(-80),
m_prevSilent(false),
m_first(true)
{
}
Silence::~Silence()
{
if (m_ibuf) del_fvec(m_ibuf);
if (m_pbuf) del_fvec(m_pbuf);
}
string
Silence::getIdentifier() const
{
return "aubiosilence";
}
string
Silence::getName() const
{
return "Aubio Silence Detector";
}
string
Silence::getDescription() const
{
return "Detect levels below a certain threshold";
}
string
Silence::getMaker() const
{
return "Paul Brossier (plugin by Chris Cannam)";
}
int
Silence::getPluginVersion() const
{
return 4;
}
string
Silence::getCopyright() const
{
return "GPL";
}
bool
Silence::initialise(size_t channels, size_t stepSize, size_t blockSize)
{
if (channels != 1) {
std::cerr << "Silence::initialise: channels must be 1" << std::endl;
return false;
}
m_stepSize = stepSize;
m_blockSize = blockSize;
m_ibuf = new_fvec(stepSize);
m_pbuf = new_fvec(stepSize);
return true;
}
void
Silence::reset()
{
m_first = true;
}
size_t
Silence::getPreferredStepSize() const
{
return 1024;
}
size_t
Silence::getPreferredBlockSize() const
{
return 1024;
}
Silence::ParameterList
Silence::getParameterDescriptors() const
{
ParameterList list;
ParameterDescriptor desc;
desc = ParameterDescriptor();
desc.identifier = "silencethreshold";
desc.name = "Silence Threshold";
desc.description = "Threshold for silence detection";
desc.minValue = -120;
desc.maxValue = 0;
desc.defaultValue = -80;
desc.unit = "dB";
desc.isQuantized = false;
list.push_back(desc);
return list;
}
float
Silence::getParameter(std::string param) const
{
if (param == "silencethreshold") {
return m_threshold;
} else {
return 0.0;
}
}
void
Silence::setParameter(std::string param, float value)
{
if (param == "silencethreshold") {
m_threshold = value;
}
}
Silence::OutputList
Silence::getOutputDescriptors() const
{
OutputList list;
OutputDescriptor d;
d.identifier = "silent";
d.name = "Silent Regions";
d.description = "Return an interval covering each silent region";
d.hasFixedBinCount = true;
d.binCount = 0;
d.hasKnownExtents = false;
d.sampleType = OutputDescriptor::VariableSampleRate;
d.sampleRate = 0;
d.hasDuration = true;
list.push_back(d);
d.identifier = "noisy";
d.name = "Non-Silent Regions";
d.description = "Return an interval covering each non-silent region";
d.hasFixedBinCount = true;
d.binCount = 0;
d.hasKnownExtents = false;
d.sampleType = OutputDescriptor::VariableSampleRate;
d.sampleRate = 0;
d.hasDuration = true;
list.push_back(d);
d.identifier = "silencelevel";
d.name = "Silence Test";
d.description = "Return a function that switches from 1 to 0 when silence falls, and back again when it ends";
d.hasFixedBinCount = true;
d.binCount = 1;
d.hasKnownExtents = true;
d.minValue = 0;
d.maxValue = 1;
d.isQuantized = true;
d.quantizeStep = 1;
d.sampleType = OutputDescriptor::VariableSampleRate;
d.sampleRate = 0;
list.push_back(d);
return list;
}
Silence::FeatureSet
Silence::process(const float *const *inputBuffers,
Vamp::RealTime timestamp)
{
for (size_t i = 0; i < m_stepSize; ++i) {
fvec_set_sample(m_ibuf, inputBuffers[0][i], i);
}
bool silent = aubio_silence_detection(m_ibuf, m_threshold);
FeatureSet returnFeatures;
if (m_first || m_prevSilent != silent) {
Vamp::RealTime featureStamp = timestamp;
if ((silent && !m_first) || !silent) {
// refine our result
long off = 0;
size_t incr = 16;
if (incr > m_stepSize/8) incr = m_stepSize/8;
fvec_t vec;
vec.length = incr * 4;
for (size_t i = 0; i < m_stepSize - incr * 4; i += incr) {
vec.data = m_ibuf->data + i;
bool subsilent = aubio_silence_detection(&vec, m_threshold);
if (silent == subsilent) {
off = i;
break;
}
}
if (silent && (off == 0)) {
for (size_t i = 0; i < m_stepSize - incr; i += incr) {
vec.data = m_pbuf->data + m_stepSize - i - incr;
bool subsilent = aubio_silence_detection(&vec, m_threshold);
if (!subsilent) {
off = -(long)i;
break;
}
}
} else {
}
featureStamp = timestamp + Vamp::RealTime::frame2RealTime
(off, lrintf(m_inputSampleRate));
}
Feature feature;
feature.hasTimestamp = true;
feature.timestamp = featureStamp;
feature.values.push_back(silent ? 0 : 1);
returnFeatures[2].push_back(feature);
feature.values.clear();
if (!m_first) {
feature.timestamp = m_lastChange;
feature.hasDuration = true;
feature.duration = featureStamp - m_lastChange;
if (silent) {
// non-silent regions feature
// (becoming silent, so this is a non-silent region)
returnFeatures[1].push_back(feature);
} else {
// silent regions feature
// (becoming non-silent, so this is a silent region)
returnFeatures[0].push_back(feature);
}
}
m_lastChange = featureStamp;
m_prevSilent = silent;
m_first = false;
}
// swap ibuf and pbuf data pointers, so that this block's data is
// available in pbuf when processing the next block, without
// having to allocate new storage for it
smpl_t *tmpdata = m_ibuf->data;
m_ibuf->data = m_pbuf->data;
m_pbuf->data = tmpdata;
m_lastTimestamp = timestamp;
return returnFeatures;
}
Silence::FeatureSet
Silence::getRemainingFeatures()
{
FeatureSet returnFeatures;
// std::cerr << "Silence::getRemainingFeatures: m_lastTimestamp = " << m_lastTimestamp << ", m_lastChange = " << m_lastChange << ", m_apiVersion = " << m_apiVersion << ", m_prevSilent = " << m_prevSilent << std::endl;
if (m_lastTimestamp > m_lastChange) {
Feature feature;
feature.hasTimestamp = true;
feature.timestamp = m_lastChange;
feature.hasDuration = true;
feature.duration = m_lastTimestamp - m_lastChange;
if (m_prevSilent) {
// silent regions feature
returnFeatures[0].push_back(feature);
} else {
// non-silent regions feature
returnFeatures[1].push_back(feature);
}
if (!m_prevSilent) {
Feature silenceTestFeature;
silenceTestFeature.hasTimestamp = true;
silenceTestFeature.timestamp = m_lastTimestamp;
silenceTestFeature.values.push_back(0);
returnFeatures[2].push_back(silenceTestFeature);
}
}
return returnFeatures;
}