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// -*- c-indentation-style:"stroustrup" c-basic-offset: 4 -*- /*
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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.
*/
#include <vector>
#include <qobject.h>
#include <qdatetime.h>
#include "SoundFile.h"
#include "RealTime.h"
#ifndef _PEAKFILE_H_
#define _PEAKFILE_H_
// A PeakFile is generated to the BWF Supplement 3 Peak Envelope Chunk
// format as defined here:
//
// http://www.ebu.ch/pmc_bwf.html
//
// To comply with BWF format files this chunk can be embedded into
// the sample file itself (writeToHandle()) or used to generate an
// external peak file (write()). At the moment the only type of file
// with an embedded peak chunk is the BWF file itself.
//
//
namespace Rosegarden
{
class AudioFile;
typedef std::pair<RealTime, RealTime> SplitPointPair;
class PeakFile : public QObject, public SoundFile
{
Q_OBJECT
public:
PeakFile(AudioFile *audioFile);
virtual ~PeakFile();
// Copy constructor
//
PeakFile(const PeakFile &);
// Standard file methods
//
virtual bool open();
virtual void close();
// Write to standard peak file
//
virtual bool write();
// Write the file, emit progress signal and process app events
//
virtual bool write(unsigned short updatePercentage);
// Write peak chunk to file handle (BWF)
//
bool writeToHandle(std::ofstream *file, unsigned short updatePercentage);
// Is the peak file valid and up to date?
//
bool isValid();
// Vital file stats
//
void printStats();
// Get a preview of a section of the audio file where that section
// is "width" pixels.
//
std::vector<float> getPreview(const RealTime &startTime,
const RealTime &endTime,
int width,
bool showMinima);
AudioFile* getAudioFile() { return m_audioFile; }
const AudioFile* getAudioFile() const { return m_audioFile; }
// Scan to a peak and scan forward a number of peaks
//
bool scanToPeak(int peak);
bool scanForward(int numberOfPeaks);
// Find threshold crossing points
//
std::vector<SplitPointPair> getSplitPoints(const RealTime &startTime,
const RealTime &endTime,
int threshold,
const RealTime &minLength);
// Accessors
//
int getVersion() const { return m_version; }
int getFormat() const { return m_format; }
int getPointsPerValue() const { return m_pointsPerValue; }
int getBlockSize() const { return m_blockSize; }
int getChannels() const { return m_channels; }
int getNumberOfPeaks() const { return m_numberOfPeaks; }
int getPositionPeakOfPeaks() const { return m_positionPeakOfPeaks; }
int getOffsetToPeaks() const { return m_offsetToPeaks; }
int getBodyBytes() const { return m_bodyBytes; }
QDateTime getModificationTime() const { return m_modificationTime; }
std::streampos getChunkStartPosition() const
{ return m_chunkStartPosition; }
bool isProcessingPeaks() const { return m_keepProcessing; }
void setProcessingPeaks(bool value) { m_keepProcessing = value; }
signals:
void setProgress(int);
protected:
// Write the peak header and the peaks themselves
//
void writeHeader(std::ofstream *file);
void writePeaks(unsigned short updatePercentage,
std::ofstream *file);
// Get the position of a peak for a given time
//
int getPeak(const RealTime &time);
// And the time of a peak
//
RealTime getTime(int peak);
// Parse the header
//
void parseHeader();
AudioFile *m_audioFile;
// Some Peak Envelope Chunk parameters
//
int m_version;
int m_format; // bytes in peak value (1 or 2)
int m_pointsPerValue;
int m_blockSize;
int m_channels;
int m_numberOfPeaks;
int m_positionPeakOfPeaks;
int m_offsetToPeaks;
int m_bodyBytes;
// Peak timestamp
//
QDateTime m_modificationTime;
std::streampos m_chunkStartPosition;
// For cacheing of peak information in memory we use the last query
// parameters as our key to the cached data.
//
RealTime m_lastPreviewStartTime;
RealTime m_lastPreviewEndTime;
int m_lastPreviewWidth;
bool m_lastPreviewShowMinima;
std::vector<float> m_lastPreviewCache;
// Do we actually want to keep processing this peakfile?
// In case we get a cancel.
//
bool m_keepProcessing;
std::string m_peakCache;
};
}
#endif // _PEAKFILE_H_
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