1 /* 2 ============================================================================== 3 4 This file is part of the JUCE library. 5 Copyright (c) 2020 - Raw Material Software Limited 6 7 JUCE is an open source library subject to commercial or open-source 8 licensing. 9 10 By using JUCE, you agree to the terms of both the JUCE 6 End-User License 11 Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020). 12 13 End User License Agreement: www.juce.com/juce-6-licence 14 Privacy Policy: www.juce.com/juce-privacy-policy 15 16 Or: You may also use this code under the terms of the GPL v3 (see 17 www.gnu.org/licenses). 18 19 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER 20 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE 21 DISCLAIMED. 22 23 ============================================================================== 24 */ 25 26 namespace juce 27 { 28 29 #if JUCE_USE_CDREADER || DOXYGEN 30 31 32 //============================================================================== 33 /** 34 A type of AudioFormatReader that reads from an audio CD. 35 36 One of these can be used to read a CD as if it's one big audio stream. Use the 37 getPositionOfTrackStart() method to find where the individual tracks are 38 within the stream. 39 40 @see AudioFormatReader 41 42 @tags{Audio} 43 */ 44 class JUCE_API AudioCDReader : public AudioFormatReader 45 { 46 public: 47 //============================================================================== 48 /** Returns a list of names of Audio CDs currently available for reading. 49 50 If there's a CD drive but no CD in it, this might return an empty list, or 51 possibly a device that can be opened but which has no tracks, depending 52 on the platform. 53 54 @see createReaderForCD 55 */ 56 static StringArray getAvailableCDNames(); 57 58 /** Tries to create an AudioFormatReader that can read from an Audio CD. 59 60 @param index the index of one of the available CDs - use getAvailableCDNames() 61 to find out how many there are. 62 @returns a new AudioCDReader object, or nullptr if it couldn't be created. The 63 caller will be responsible for deleting the object returned. 64 */ 65 static AudioCDReader* createReaderForCD (const int index); 66 67 //============================================================================== 68 /** Destructor. */ 69 ~AudioCDReader() override; 70 71 /** Implementation of the AudioFormatReader method. */ 72 bool readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer, 73 int64 startSampleInFile, int numSamples) override; 74 75 /** Checks whether the CD has been removed from the drive. */ 76 bool isCDStillPresent() const; 77 78 /** Returns the total number of tracks (audio + data). */ 79 int getNumTracks() const; 80 81 /** Finds the sample offset of the start of a track. 82 @param trackNum the track number, where trackNum = 0 is the first track 83 and trackNum = getNumTracks() means the end of the CD. 84 */ 85 int getPositionOfTrackStart (int trackNum) const; 86 87 /** Returns true if a given track is an audio track. 88 @param trackNum the track number, where 0 is the first track. 89 */ 90 bool isTrackAudio (int trackNum) const; 91 92 /** Returns an array of sample offsets for the start of each track, followed by 93 the sample position of the end of the CD. 94 */ 95 const Array<int>& getTrackOffsets() const; 96 97 /** Refreshes the object's table of contents. 98 99 If the disc has been ejected and a different one put in since this 100 object was created, this will cause it to update its idea of how many tracks 101 there are, etc. 102 */ 103 void refreshTrackLengths(); 104 105 /** Enables scanning for indexes within tracks. 106 @see getLastIndex 107 */ 108 void enableIndexScanning (bool enabled); 109 110 /** Returns the index number found during the last read() call. 111 112 Index scanning is turned off by default - turn it on with enableIndexScanning(). 113 114 Then when the read() method is called, if it comes across an index within that 115 block, the index number is stored and returned by this method. 116 117 Some devices might not support indexes, of course. 118 119 (If you don't know what CD indexes are, it's unlikely you'll ever need them). 120 121 @see enableIndexScanning 122 */ 123 int getLastIndex() const; 124 125 /** Scans a track to find the position of any indexes within it. 126 @param trackNumber the track to look in, where 0 is the first track on the disc 127 @returns an array of sample positions of any index points found (not including 128 the index that marks the start of the track) 129 */ 130 Array<int> findIndexesInTrack (const int trackNumber); 131 132 /** Returns the CDDB id number for the CD. 133 It's not a great way of identifying a disc, but it's traditional. 134 */ 135 int getCDDBId(); 136 137 /** Tries to eject the disk. 138 Ejecting the disk might not actually be possible, e.g. if some other process is using it. 139 */ 140 void ejectDisk(); 141 142 //============================================================================== 143 enum 144 { 145 framesPerSecond = 75, 146 samplesPerFrame = 44100 / framesPerSecond 147 }; 148 149 private: 150 //============================================================================== 151 Array<int> trackStartSamples; 152 153 #if JUCE_MAC 154 File volumeDir; 155 Array<File> tracks; 156 int currentReaderTrack; 157 std::unique_ptr<AudioFormatReader> reader; 158 AudioCDReader (const File& volume); 159 160 #elif JUCE_WINDOWS 161 bool audioTracks [100]; 162 void* handle; 163 MemoryBlock buffer; 164 bool indexingEnabled; 165 int lastIndex, firstFrameInBuffer, samplesInBuffer; 166 AudioCDReader (void* handle); 167 int getIndexAt (int samplePos); 168 169 #elif JUCE_LINUX || JUCE_BSD 170 AudioCDReader(); 171 #endif 172 173 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioCDReader) 174 }; 175 176 #endif 177 178 } // namespace juce 179