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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 Chris Cannam.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #ifndef _MP3_FILE_READER_H_
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17 #define _MP3_FILE_READER_H_
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18
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19 #ifdef HAVE_MAD
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20
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21 #include "CodedAudioFileReader.h"
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22
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23 #include "base/Thread.h"
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24 #include <mad.h>
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25
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26 #include <set>
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27
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28 class ProgressReporter;
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29
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30 class MP3FileReader : public CodedAudioFileReader
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31 {
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32 Q_OBJECT
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33
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34 public:
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35 enum DecodeMode {
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36 DecodeAtOnce, // decode the file on construction, with progress
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37 DecodeThreaded // decode in a background thread after construction
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38 };
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39
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40 MP3FileReader(FileSource source,
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41 DecodeMode decodeMode,
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42 CacheMode cacheMode,
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43 size_t targetRate = 0,
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44 ProgressReporter *reporter = 0);
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45 virtual ~MP3FileReader();
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46
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47 virtual QString getError() const { return m_error; }
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48
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49 virtual QString getLocation() const { return m_source.getLocation(); }
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50 virtual QString getTitle() const { return m_title; }
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51 virtual QString getMaker() const { return m_maker; }
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52 virtual TagMap getTags() const { return m_tags; }
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53
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54 static void getSupportedExtensions(std::set<QString> &extensions);
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55 static bool supportsExtension(QString ext);
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56 static bool supportsContentType(QString type);
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57 static bool supports(FileSource &source);
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58
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59 virtual int getDecodeCompletion() const { return m_completion; }
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60
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61 virtual bool isUpdating() const {
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62 return m_decodeThread && m_decodeThread->isRunning();
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63 }
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64
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65 public slots:
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66 void cancelled();
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67
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68 protected:
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69 FileSource m_source;
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70 QString m_path;
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71 QString m_error;
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72 QString m_title;
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73 QString m_maker;
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74 TagMap m_tags;
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75 size_t m_fileSize;
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76 double m_bitrateNum;
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77 size_t m_bitrateDenom;
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78 int m_completion;
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79 bool m_done;
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80
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81 unsigned char *m_filebuffer;
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82 float **m_samplebuffer;
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83 size_t m_samplebuffersize;
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84
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85 ProgressReporter *m_reporter;
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86 bool m_cancelled;
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87
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88 struct DecoderData
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89 {
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90 unsigned char const *start;
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91 unsigned long length;
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92 MP3FileReader *reader;
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93 };
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94
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95 bool decode(void *mm, size_t sz);
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96 enum mad_flow accept(struct mad_header const *, struct mad_pcm *);
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97
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98 static enum mad_flow input(void *, struct mad_stream *);
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99 static enum mad_flow output(void *, struct mad_header const *, struct mad_pcm *);
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100 static enum mad_flow error(void *, struct mad_stream *, struct mad_frame *);
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101
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102 class DecodeThread : public Thread
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103 {
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104 public:
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105 DecodeThread(MP3FileReader *reader) : m_reader(reader) { }
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106 virtual void run();
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107
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108 protected:
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109 MP3FileReader *m_reader;
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110 };
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111
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112 DecodeThread *m_decodeThread;
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113
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114 void loadTags();
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115 QString loadTag(void *vtag, const char *name);
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116 };
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117
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118 #endif
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119
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120 #endif
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