view data/fileio/CodedAudioFileReader.h @ 1008:d9e0e59a1581

When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _CODED_AUDIO_FILE_READER_H_
#define _CODED_AUDIO_FILE_READER_H_

#include "AudioFileReader.h"

#include <sndfile.h>
#include <QMutex>
#include <QReadWriteLock>

class WavFileReader;
class Serialiser;
class Resampler;

class CodedAudioFileReader : public AudioFileReader
{
    Q_OBJECT

public:
    virtual ~CodedAudioFileReader();

    enum CacheMode {
        CacheInTemporaryFile,
        CacheInMemory
    };

    virtual void getInterleavedFrames(int start, int count,
				      SampleBlock &frames) const;

    virtual int getNativeRate() const { return m_fileRate; }

    /// Intermediate cache means all CodedAudioFileReaders are quickly seekable
    virtual bool isQuicklySeekable() const { return true; }

signals:
    void progress(int);

protected:
    CodedAudioFileReader(CacheMode cacheMode, 
                         int targetRate,
                         bool normalised);

    void initialiseDecodeCache(); // samplerate, channels must have been set

    // may throw InsufficientDiscSpace:
    void addSamplesToDecodeCache(float **samples, int nframes);
    void addSamplesToDecodeCache(float *samplesInterleaved, int nframes);
    void addSamplesToDecodeCache(const SampleBlock &interleaved);

    // may throw InsufficientDiscSpace:
    void finishDecodeCache();

    bool isDecodeCacheInitialised() const { return m_initialised; }

    void startSerialised(QString id);
    void endSerialised();

private:
    void pushBuffer(float *interleaved, int sz, bool final);
    void pushBufferResampling(float *interleaved, int sz, float ratio, bool final);
    void pushBufferNonResampling(float *interleaved, int sz);

protected:
    QMutex m_cacheMutex;
    CacheMode m_cacheMode;
    SampleBlock m_data;
    mutable QReadWriteLock m_dataLock;
    bool m_initialised;
    Serialiser *m_serialiser;
    int m_fileRate;

    QString m_cacheFileName;
    SNDFILE *m_cacheFileWritePtr;
    WavFileReader *m_cacheFileReader;
    float *m_cacheWriteBuffer;
    int m_cacheWriteBufferIndex;
    int m_cacheWriteBufferSize; // frames

    Resampler *m_resampler;
    float *m_resampleBuffer;
    int m_fileFrameCount;

    bool m_normalised;
    float m_max;
    float m_gain;
};

#endif