juce/source/src/audio/audio_file_formats/juce_AudioCDReader.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library - "Jules' Utility Class Extensions"
   5    Copyright 2004-11 by Raw Material Software Ltd.
   6
   7   ------------------------------------------------------------------------------
   8
   9    JUCE can be redistributed and/or modified under the terms of the GNU General
  10    Public License (Version 2), as published by the Free Software Foundation.
  11    A copy of the license is included in the JUCE distribution, or can be found
  12    online at www.gnu.org/licenses.
  13
  14    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
  15    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18   ------------------------------------------------------------------------------
  19
  20    To release a closed-source product which uses JUCE, commercial licenses are
  21    available: visit www.rawmaterialsoftware.com/juce for more information.
  22
  23   ==============================================================================
  24 */
  25
  26 #include "../../core/juce_StandardHeader.h"
  27
  28 #if JUCE_USE_CDREADER
  29
  30 BEGIN_JUCE_NAMESPACE
  31
  32 #include "juce_AudioCDReader.h"
  33
  34
  35 //==============================================================================
  36 int AudioCDReader::getNumTracks() const
  37 {
  38     return trackStartSamples.size() - 1;
  39 }
  40
  41 int AudioCDReader::getPositionOfTrackStart (int trackNum) const
  42 {
  43     return trackStartSamples [trackNum];
  44 }
  45
  46 const Array<int>& AudioCDReader::getTrackOffsets() const
  47 {
  48     return trackStartSamples;
  49 }
  50
  51 int AudioCDReader::getCDDBId()
  52 {
  53     int checksum = 0;
  54     const int numTracks = getNumTracks();
  55
  56     for (int i = 0; i < numTracks; ++i)
  57         for (int offset = (trackStartSamples.getUnchecked(i) + 88200) / 44100; offset > 0; offset /= 10)
  58             checksum += offset % 10;
  59
  60     const int length = (trackStartSamples.getLast() - trackStartSamples.getFirst()) / 44100;
  61
  62     // CCLLLLTT: checksum, length, tracks
  63     return ((checksum & 0xff) << 24) | (length << 8) | numTracks;
  64 }
  65
  66
  67 END_JUCE_NAMESPACE
  68
  69 #endif