cannam@59: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@59: 
cannam@59: /*
cannam@59:     Vamp
cannam@59: 
cannam@59:     An API for audio analysis and feature extraction plugins.
cannam@59: 
cannam@59:     Centre for Digital Music, Queen Mary, University of London.
cannam@59:     Copyright 2006 Chris Cannam.
cannam@59:   
cannam@59:     Permission is hereby granted, free of charge, to any person
cannam@59:     obtaining a copy of this software and associated documentation
cannam@59:     files (the "Software"), to deal in the Software without
cannam@59:     restriction, including without limitation the rights to use, copy,
cannam@59:     modify, merge, publish, distribute, sublicense, and/or sell copies
cannam@59:     of the Software, and to permit persons to whom the Software is
cannam@59:     furnished to do so, subject to the following conditions:
cannam@59: 
cannam@59:     The above copyright notice and this permission notice shall be
cannam@59:     included in all copies or substantial portions of the Software.
cannam@59: 
cannam@59:     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@59:     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@59:     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
cannam@59:     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
cannam@59:     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@59:     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@59:     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@59: 
cannam@59:     Except as contained in this notice, the names of the Centre for
cannam@59:     Digital Music; Queen Mary, University of London; and Chris Cannam
cannam@59:     shall not be used in advertising or otherwise to promote the sale,
cannam@59:     use or other dealings in this Software without prior written
cannam@59:     authorization.
cannam@59: */
cannam@59: 
cannam@59: #include "PluginChannelAdapter.h"
cannam@59: 
cannam@59: namespace Vamp {
cannam@59: 
cannam@59: namespace HostExt {
cannam@59: 
cannam@59: PluginChannelAdapter::PluginChannelAdapter(Plugin *plugin) :
cannam@59:     PluginWrapper(plugin),
cannam@59:     m_blockSize(0),
cannam@59:     m_inputChannels(0),
cannam@59:     m_pluginChannels(0),
cannam@59:     m_buffer(0),
cannam@59:     m_forwardPtrs(0)
cannam@59: {
cannam@59: }
cannam@59: 
cannam@59: PluginChannelAdapter::~PluginChannelAdapter()
cannam@59: {
cannam@59:     if (m_buffer) {
cannam@59:         if (m_inputChannels > m_pluginChannels) {
cannam@59:             delete[] m_buffer[0];
cannam@59:         } else {
cannam@59:             for (size_t i = 0; i < m_pluginChannels - m_inputChannels; ++i) {
cannam@59:                 delete[] m_buffer[i];
cannam@59:             }
cannam@59:         }
cannam@59:         delete[] m_buffer;
cannam@59:         m_buffer = 0;
cannam@59:     }
cannam@59: 
cannam@59:     if (m_forwardPtrs) {
cannam@59:         delete[] m_forwardPtrs;
cannam@59:         m_forwardPtrs = 0;
cannam@59:     }
cannam@59: }
cannam@59: 
cannam@59: bool
cannam@59: PluginChannelAdapter::initialise(size_t channels, size_t stepSize, size_t blockSize)
cannam@59: {
cannam@59:     m_blockSize = blockSize;
cannam@59: 
cannam@59:     size_t minch = m_plugin->getMinChannelCount();
cannam@59:     size_t maxch = m_plugin->getMaxChannelCount();
cannam@59: 
cannam@59:     m_inputChannels = channels;
cannam@59: 
cannam@59:     if (channels < minch) {
cannam@59:         m_forwardPtrs = new const float *[minch];
cannam@59:         if (m_inputChannels > 1) {
cannam@59:             // We need a set of zero-valued buffers to add to the
cannam@59:             // forwarded pointers
cannam@59:             m_buffer = new float*[minch - channels];
cannam@59:             for (size_t i = 0; i < minch; ++i) {
cannam@59:                 m_buffer[i] = new float[blockSize];
cannam@59:                 for (size_t j = 0; j < blockSize; ++j) {
cannam@59:                     m_buffer[i][j] = 0.f;
cannam@59:                 }
cannam@59:             }
cannam@59:         }
cannam@59:         m_pluginChannels = minch;
cannam@59:         return m_plugin->initialise(minch, stepSize, blockSize);
cannam@59:     }
cannam@59: 
cannam@59:     if (channels > maxch) {
cannam@59:         // We only need m_buffer if we are mixing down to a single
cannam@59:         // channel -- otherwise we can just forward the same float* as
cannam@59:         // passed in to process(), expecting the excess to be ignored
cannam@59:         if (maxch == 1) {
cannam@59:             m_buffer = new float *[1];
cannam@59:             m_buffer[0] = new float[blockSize];
cannam@59:         }
cannam@59:         m_pluginChannels = maxch;
cannam@59:         return m_plugin->initialise(maxch, stepSize, blockSize);
cannam@59:     }
cannam@59: 
cannam@59:     m_pluginChannels = channels;
cannam@59:     return m_plugin->initialise(channels, stepSize, blockSize);
cannam@59: }
cannam@59: 
cannam@59: PluginChannelAdapter::FeatureSet
cannam@59: PluginChannelAdapter::process(const float *const *inputBuffers,
cannam@59:                               RealTime timestamp)
cannam@59: {
cannam@59:     if (m_inputChannels < m_pluginChannels) {
cannam@59: 
cannam@59:         if (m_inputChannels == 1) {
cannam@59:             for (size_t i = 0; i < m_pluginChannels; ++i) {
cannam@59:                 m_forwardPtrs[i] = inputBuffers[0];
cannam@59:             }
cannam@59:         } else {
cannam@59:             for (size_t i = 0; i < m_inputChannels; ++i) {
cannam@59:                 m_forwardPtrs[i] = inputBuffers[i];
cannam@59:             }
cannam@59:             for (size_t i = m_inputChannels; i < m_pluginChannels; ++i) {
cannam@59:                 m_forwardPtrs[i] = m_buffer[i - m_inputChannels];
cannam@59:             }
cannam@59:         }
cannam@59: 
cannam@59:         return m_plugin->process(m_forwardPtrs, timestamp);
cannam@59:     }
cannam@59: 
cannam@59:     if (m_inputChannels > m_pluginChannels) {
cannam@59: 
cannam@59:         if (m_pluginChannels == 1) {
cannam@59:             for (size_t j = 0; j < m_blockSize; ++j) {
cannam@59:                 m_buffer[0][j] = inputBuffers[0][j];
cannam@59:             }
cannam@59:             for (size_t i = 1; i < m_inputChannels; ++i) {
cannam@59:                 for (size_t j = 0; j < m_blockSize; ++j) {
cannam@59:                     m_buffer[0][j] += inputBuffers[i][j];
cannam@59:                 }
cannam@59:             }
cannam@59:             for (size_t j = 0; j < m_blockSize; ++j) {
cannam@59:                 m_buffer[0][j] /= m_inputChannels;
cannam@59:             }
cannam@59:             return m_plugin->process(m_buffer, timestamp);
cannam@59:         } else {
cannam@59:             return m_plugin->process(inputBuffers, timestamp);
cannam@59:         }
cannam@59:     }
cannam@59: 
cannam@59:     return m_plugin->process(inputBuffers, timestamp);
cannam@59: }
cannam@59: 
cannam@59: }
cannam@59: 
cannam@59: }
cannam@59: 
cannam@59: