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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 _CODED_AUDIO_FILE_READER_H_
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17 #define _CODED_AUDIO_FILE_READER_H_
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18
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19 #include "AudioFileReader.h"
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20
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21 #include <sndfile.h>
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22 #include <QMutex>
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23 #include <QReadWriteLock>
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24
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25 class WavFileReader;
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26 class Serialiser;
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27 class Resampler;
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28
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29 class CodedAudioFileReader : public AudioFileReader
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30 {
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31 Q_OBJECT
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32
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33 public:
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34 virtual ~CodedAudioFileReader();
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35
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36 enum CacheMode {
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37 CacheInTemporaryFile,
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38 CacheInMemory
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39 };
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40
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41 virtual void getInterleavedFrames(int start, int count,
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42 SampleBlock &frames) const;
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43
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44 virtual int getNativeRate() const { return m_fileRate; }
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45
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46 /// Intermediate cache means all CodedAudioFileReaders are quickly seekable
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47 virtual bool isQuicklySeekable() const { return true; }
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48
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49 signals:
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50 void progress(int);
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51
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52 protected:
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53 CodedAudioFileReader(CacheMode cacheMode, int targetRate);
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54
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55 void initialiseDecodeCache(); // samplerate, channels must have been set
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56
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57 // may throw InsufficientDiscSpace:
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58 void addSamplesToDecodeCache(float **samples, int nframes);
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59 void addSamplesToDecodeCache(float *samplesInterleaved, int nframes);
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60 void addSamplesToDecodeCache(const SampleBlock &interleaved);
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61
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62 // may throw InsufficientDiscSpace:
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63 void finishDecodeCache();
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64
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65 bool isDecodeCacheInitialised() const { return m_initialised; }
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66
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67 void startSerialised(QString id);
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68 void endSerialised();
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69
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70 private:
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71 void pushBuffer(float *interleaved, int sz, bool final);
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72 void pushBufferResampling(float *interleaved, int sz, float ratio, bool final);
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73 void pushBufferNonResampling(float *interleaved, int sz);
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74
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75 protected:
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76 QMutex m_cacheMutex;
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77 CacheMode m_cacheMode;
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78 SampleBlock m_data;
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79 mutable QReadWriteLock m_dataLock;
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80 bool m_initialised;
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81 Serialiser *m_serialiser;
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82 int m_fileRate;
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83
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84 QString m_cacheFileName;
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85 SNDFILE *m_cacheFileWritePtr;
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86 WavFileReader *m_cacheFileReader;
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87 float *m_cacheWriteBuffer;
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88 int m_cacheWriteBufferIndex;
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89 int m_cacheWriteBufferSize; // frames
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90
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91 Resampler *m_resampler;
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92 float *m_resampleBuffer;
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93 int m_fileFrameCount;
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94 };
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95
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96 #endif
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