src/calf/wave.h

   1 /* Calf DSP Library
   2  * Primitive interface to NAS WAV file operations.
   3  * Not really useful for now, I've used it for testing previously.
   4  *
   5  * Copyright (C) 2007 Krzysztof Foltman
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General
  18  * Public License along with this program; if not, write to the
  19  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include <audio/wave.h>
  24
  25 namespace dsp {
  26
  27 template<class T>
  28 bool load_wave(dsp::dynamic_buffer<T> &dest, const char *file_name) {
  29     WaveInfo *file = WaveOpenFileForReading(file_name);
  30     typedef dsp::sample_traits<T> st;
  31     if (file->channels == st::channels && file->bitsPerSample == st::bps) {
  32         dest.resize(file->numSamples);
  33         WaveReadFile((char *)dest.data(), dest.size()*sizeof(T), file);
  34         WaveCloseFile(file);
  35         return true;
  36     }
  37     WaveCloseFile(file);
  38     fprintf(stderr, "Sorry, need a %d channels and %d bps, got %d channels and %d bps\n", st::channels, st::bps, file->channels, file->bitsPerSample);
  39     return false;
  40 }
  41
  42 template<class T>
  43 class wave_player {
  44     T *data;
  45     bool is_active;
  46     unsigned int size;
  47     wpos pos, rate;
  48 public:
  49     void set_wave(T *_data, int _size) {
  50         data = _data;
  51         size = _size;
  52         is_active = false;
  53     }
  54     void get_wave(T *&_data, int &_size) {
  55         _data = data;
  56         _size = size;
  57     }
  58     void set_pos(wpos _pos) {
  59         pos = _pos;
  60         is_active = true;
  61     }
  62     wpos get_pos() {
  63         return pos;
  64     }
  65     void set_rate(wpos _rate) {
  66         rate = _rate;
  67     }
  68     template<class U>U get() {
  69         U result;
  70         if (!is_active) {
  71             dsp::zero(result);
  72             return result;
  73         }
  74         unsigned int ipos = pos.ipart();
  75         if (ipos>=size) {
  76             dsp::zero(result);
  77             is_active = false;
  78             return result;
  79         }
  80         result = pos.lerp_ptr_lookup_int<T, 12, int >(data);
  81         pos += rate;
  82         return result;
  83     }
  84     bool get_active() {
  85         return is_active;
  86     }
  87 };
  88
  89 }