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Diffstat (limited to 'libs/vamp-plugins/AmplitudeFollower.cpp')
-rw-r--r-- | libs/vamp-plugins/AmplitudeFollower.cpp | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/libs/vamp-plugins/AmplitudeFollower.cpp b/libs/vamp-plugins/AmplitudeFollower.cpp deleted file mode 100644 index 7023297d33..0000000000 --- a/libs/vamp-plugins/AmplitudeFollower.cpp +++ /dev/null @@ -1,247 +0,0 @@ -/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ - -/* - Vamp - - An API for audio analysis and feature extraction plugins. - - Centre for Digital Music, Queen Mary, University of London. - This file copyright 2006 Dan Stowell. - - Permission is hereby granted, free of charge, to any person - obtaining a copy of this software and associated documentation - files (the "Software"), to deal in the Software without - restriction, including without limitation the rights to use, copy, - modify, merge, publish, distribute, sublicense, and/or sell copies - of the Software, and to permit persons to whom the Software is - furnished to do so, subject to the following conditions: - - The above copyright notice and this permission notice shall be - included in all copies or substantial portions of the Software. - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR - ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF - CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION - WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - - Except as contained in this notice, the names of the Centre for - Digital Music; Queen Mary, University of London; and Chris Cannam - shall not be used in advertising or otherwise to promote the sale, - use or other dealings in this Software without prior written - authorization. -*/ - -#include "AmplitudeFollower.h" - -#include <cmath> - -#include <string> -#include <vector> -#include <iostream> - -using std::string; -using std::vector; -using std::cerr; -using std::endl; - -/** - * An implementation of SuperCollider's amplitude-follower algorithm - * as a simple Vamp plugin. - */ - -AmplitudeFollower::AmplitudeFollower(float inputSampleRate) : - Plugin(inputSampleRate), - m_stepSize(0), - m_previn(0.0f), - m_clampcoef(0.01f), - m_relaxcoef(0.01f) -{ -} - -AmplitudeFollower::~AmplitudeFollower() -{ -} - -string -AmplitudeFollower::getIdentifier() const -{ - return "amplitudefollower"; -} - -string -AmplitudeFollower::getName() const -{ - return "Amplitude Follower"; -} - -string -AmplitudeFollower::getDescription() const -{ - return "Track the amplitude of the audio signal"; -} - -string -AmplitudeFollower::getMaker() const -{ - return "Vamp SDK Example Plugins"; -} - -int -AmplitudeFollower::getPluginVersion() const -{ - return 1; -} - -string -AmplitudeFollower::getCopyright() const -{ - return "Code copyright 2006 Dan Stowell; method from SuperCollider. Freely redistributable (BSD license)"; -} - -bool -AmplitudeFollower::initialise(size_t channels, size_t stepSize, size_t blockSize) -{ - if (channels < getMinChannelCount() || - channels > getMaxChannelCount()) return false; - - m_stepSize = std::min(stepSize, blockSize); - - // Translate the coefficients - // from their "convenient" 60dB convergence-time values - // to real coefficients - m_clampcoef = m_clampcoef==0.0 ? 0.0 : exp(log(0.1)/(m_clampcoef * m_inputSampleRate)); - m_relaxcoef = m_relaxcoef==0.0 ? 0.0 : exp(log(0.1)/(m_relaxcoef * m_inputSampleRate)); - - return true; -} - -void -AmplitudeFollower::reset() -{ - m_previn = 0.0f; -} - -AmplitudeFollower::OutputList -AmplitudeFollower::getOutputDescriptors() const -{ - OutputList list; - - OutputDescriptor sca; - sca.identifier = "amplitude"; - sca.name = "Amplitude"; - sca.description = ""; - sca.unit = "V"; - sca.hasFixedBinCount = true; - sca.binCount = 1; - sca.hasKnownExtents = false; - sca.isQuantized = false; - sca.sampleType = OutputDescriptor::OneSamplePerStep; - list.push_back(sca); - - return list; -} - -AmplitudeFollower::ParameterList -AmplitudeFollower::getParameterDescriptors() const -{ - ParameterList list; - - ParameterDescriptor att; - att.identifier = "attack"; - att.name = "Attack time"; - att.description = ""; - att.unit = "s"; - att.minValue = 0.0f; - att.maxValue = 1.f; - att.defaultValue = 0.01f; - att.isQuantized = false; - - list.push_back(att); - - ParameterDescriptor dec; - dec.identifier = "release"; - dec.name = "Release time"; - dec.description = ""; - dec.unit = "s"; - dec.minValue = 0.0f; - dec.maxValue = 1.f; - dec.defaultValue = 0.01f; - dec.isQuantized = false; - - list.push_back(dec); - - return list; -} - -void AmplitudeFollower::setParameter(std::string paramid, float newval) -{ - if (paramid == "attack") { - m_clampcoef = newval; - } else if (paramid == "release") { - m_relaxcoef = newval; - } -} - -float AmplitudeFollower::getParameter(std::string paramid) const -{ - if (paramid == "attack") { - return m_clampcoef; - } else if (paramid == "release") { - return m_relaxcoef; - } - - return 0.0f; -} - -AmplitudeFollower::FeatureSet -AmplitudeFollower::process(const float *const *inputBuffers, - Vamp::RealTime timestamp) -{ - if (m_stepSize == 0) { - cerr << "ERROR: AmplitudeFollower::process: " - << "AmplitudeFollower has not been initialised" - << endl; - return FeatureSet(); - } - - float previn = m_previn; - - FeatureSet returnFeatures; - - float val; - float peak = 0.0f; - - for (size_t i = 0; i < m_stepSize; ++i) { - - val = fabs(inputBuffers[0][i]); - - if (val < previn) { - val = val + (previn - val) * m_relaxcoef; - } else { - val = val + (previn - val) * m_clampcoef; - } - - if (val > peak) peak = val; - previn = val; - } - - m_previn = previn; - - // Now store the "feature" (peak amp) for this sample - Feature feature; - feature.hasTimestamp = false; - feature.values.push_back(peak); - returnFeatures[0].push_back(feature); - - return returnFeatures; -} - -AmplitudeFollower::FeatureSet -AmplitudeFollower::getRemainingFeatures() -{ - return FeatureSet(); -} - |