purezen 0.0.2

Runtime for the Pure Data (Pd) audio programming language, implemented as an extensible audio library allowing full control over signal processing, message passing, and graph manipulation. Pure Data is a graph-based programming language environment creating interactive music and multimedia works.
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/*
 *  Copyright 2010 Reality Jockey, Ltd.
 *                 info@rjdj.me
 *                 http://rjdj.me/
 *
 *  This file is part of ZenGarden.
 *
 *  ZenGarden is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ZenGarden 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with ZenGarden.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ArrayArithmetic.h"
#include "DspTableRead.h"
#include "PdGraph.h"

message::Object *DspTableRead::new_object(pd::Message *init_message, PdGraph *graph) {
  return new DspTableRead(init_message, graph);
}

DspTableRead::DspTableRead(pd::Message *init_message, PdGraph *graph) : DspObject(2, 1, 0, 1, graph) {
  name = init_message->is_symbol(0) ? utils::copy_string(init_message->get_symbol(0)) : NULL;
  table = NULL;
  offset = 0.0f;
}

DspTableRead::~DspTableRead() {
  free(name);
}

void DspTableRead::set_table(MessageTable *aTable) {
  table = aTable;
}

void DspTableRead::process_message(int inlet_index, pd::Message *message) {
  switch (inlet_index) {
    case 0: {
      if (message->is_symbol_str(0, "set") && message->is_symbol(1)) {
        // change the table from which this object reads
        free(name);
        name = utils::copy_string(message->get_symbol(1));
        table = graph->get_table(name);
      }
      break;
    }
    case 1: {
      if (message->is_float(0)) {
        offset = message->get_float(0); // set onset into table
      }
      break;
    }
    default: {
      break;
    }
  }
}

void DspTableRead::processDspWithIndex(int fromIndex, int toIndex) {
  if (table != NULL) { // ensure that there is a table to read from!
    int bufferLength = 0;
    float *buffer = table->getBuffer(&bufferLength);
    #if __APPLE__
    int duration = toIndex - fromIndex;
    float *outBuff = dspBufferAtOutlet[0]+fromIndex;

    // add the offset
    vDSP_vsadd(dspBufferAtInlet[0]+fromIndex, 1, &offset, outBuff, 1, duration);

    // clip to the bounds of the table
    // NOTE(mhroth): is this necessary? Or does vDSP_vindex clip automatically? What is the
    // clipping behaviour of vDSP_vindex?
    float min = 0;
    float max = (float) (bufferLength-1);
    vDSP_vclip(outBuff, 1, &min, &max, outBuff, 1, duration);

    // select the indicies
    vDSP_vindex(buffer, outBuff, 1, outBuff, 1, duration);
    #else
    float *input_buffer = dspBufferAtInlet[0];
    for (int i = fromIndex; i < toIndex; i++) {
      int x = (int) (input_buffer[i] + offset);
      if (x <= 0) {
        dspBufferAtOutlet[0][i] = buffer[0];
      } else if (x >= bufferLength) {
        dspBufferAtOutlet[0][i] = buffer[bufferLength-1];
      } else {
        dspBufferAtOutlet[0][i] = buffer[x];
      }
    }
    #endif
  }
}