/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Initial Developer of the Original Code is
 * CSIRO
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s): Shane Stephens, Michael Martin, Marcin Lubonski
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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/**
 * Helper functions for audio data aggregation
 */

#include "plugin_tools.h"

#include <stdlib.h>
#include <math.h>
#include <string.h>

void 
buffer_audio_data(unsigned char ** buffer, int* buffer_length, 
          unsigned char * data, int samples, int sample_size, int channels) {
  int _buf_length = (*buffer_length);
  int bytes = samples * sample_size * channels;
  *buffer = realloc(*buffer, _buf_length + bytes);
  if (data != 0) {
    float_to_short_array((float *) data, (short*)(*buffer + _buf_length), 
                                samples * channels);
    _buf_length += bytes;
  }
  (*buffer_length) = _buf_length;
}

void
float_to_short_array(const float* in, short* out, int len) {
  int i = 0;
  float scaled_value = 0;
  for(i = 0; i < len; i++) {
    scaled_value = floorf(0.5 + 32768 * in[i]);
    if (in[i] < 0) {
      out[i] = (scaled_value < -32768.0) ? -32768 : (short)scaled_value;
    } else {
      out[i] = (scaled_value > 32767.0) ? 32767 : (short)scaled_value;
    }
  }
}