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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <[email protected]>,
Chris Cannam <[email protected]>,
Richard Bown <[email protected]>
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.
*/
#ifndef _AUDIOFILE_H_
#define _AUDIOFILE_H_
#include <string>
#include <vector>
#include <cmath>
#include <qfileinfo.h>
#include "SoundFile.h"
#include "RealTime.h"
// An AudioFile maintains information pertaining to an audio sample.
// This is an abstract base class from which we derive our actual
// AudioFile types - WAV, BWF, AIFF etc.
//
//
namespace Rosegarden
{
typedef unsigned int AudioFileId;
// The different types of audio file we support.
//
typedef enum
{
UNKNOWN, // not yet known
WAV, // RIFF (Resource Interchange File Format) wav file
BWF, // RIFF Broadcast Wave File
AIFF, // Audio Interchange File Format
MP3
} AudioFileType;
class AudioFile : public SoundFile
{
public:
// The "read" constructor - open a file
// an assign a name and id to it.
//
AudioFile(AudioFileId id,
const std::string &name,
const std::string &fileName);
// The "write" constructor - we only need to
// specify a filename and some parameters and
// then write it out.
//
AudioFile(const std::string &fileName,
unsigned int channels,
unsigned int sampleRate,
unsigned int bitsPerSample);
~AudioFile();
// Id of this audio file (used by AudioFileManager)
//
void setId(AudioFileId id) { m_id = id; }
AudioFileId getId() const { return m_id; }
// Name of this sample - in addition to a filename
//
void setName(const std::string &name) { m_name = name; }
std::string getName() const { return m_name; }
// Used for waveform interpolation at a point
//
float sinc(float value) { return sin(M_PI * value)/ M_PI * value; }
// Audio file identifier - set in constructor of file type
//
AudioFileType getType() const { return m_type; }
unsigned int getBitsPerSample() const { return m_bitsPerSample; }
unsigned int getSampleRate() const { return m_sampleRate; }
unsigned int getChannels() const { return m_channels; }
// We must continue our main control abstract methods from SoundFile
// and add our own close() method that will add any relevant header
// information to an audio file that has been written and is now
// being closed.
//
virtual bool open() = 0;
virtual bool write() = 0;
virtual void close() = 0;
// Show the information we have on this file
//
virtual void printStats() = 0;
// Move file pointer to relative time in data chunk - shouldn't be
// less than zero. Returns true if the scan time was valid and
// successful. Need two interfaces because when playing we use an
// external file handle (one per playback instance - PlayableAudioFile)
//
virtual bool scanTo(const RealTime &time) = 0;
virtual bool scanTo(std::ifstream *file, const RealTime &time) = 0;
// Scan forward in a file by a certain amount of time - same
// double interface (simple one for peak file generation, other
// for playback).
//
virtual bool scanForward(const RealTime &time) = 0;
virtual bool scanForward(std::ifstream *file, const RealTime &time) = 0;
// Return a number of samples - caller will have to
// de-interleave n-channel samples themselves.
//
virtual std::string getSampleFrames(std::ifstream *file,
unsigned int frames) = 0;
// Return a number of samples - caller will have to
// de-interleave n-channel samples themselves. Place
// results in buf, return actual number of frames read.
//
virtual unsigned int getSampleFrames(std::ifstream *file,
char *buf,
unsigned int frames) = 0;
// Return a number of (possibly) interleaved samples
// over a time slice from current file pointer position.
//
virtual std::string getSampleFrameSlice(std::ifstream *file,
const RealTime &time) = 0;
// Append a string of samples to an already open (for writing)
// audio file. Caller must have interleaved samples etc.
//
virtual bool appendSamples(const std::string &buffer) = 0;
// Append a string of samples to an already open (for writing)
// audio file. Caller must have interleaved samples etc.
//
virtual bool appendSamples(const char *buffer, unsigned int frames) = 0;
// Get the length of the sample file in RealTime
//
virtual RealTime getLength() = 0;
// Offset to start of sample data
//
virtual std::streampos getDataOffset() = 0;
// Return the peak file name
//
virtual std::string getPeakFilename() = 0;
// Return the modification timestamp
//
QDateTime getModificationDateTime();
// Implement in actual file type
//
virtual unsigned int getBytesPerFrame() = 0;
// Decode and de-interleave the given samples that were retrieved
// from this file or another with the same format as it. Place
// the results in the given float buffer. Return true for
// success. This function does crappy resampling if necessary.
//
virtual bool decode(const unsigned char *sourceData,
size_t sourceBytes,
size_t targetSampleRate,
size_t targetChannels,
size_t targetFrames,
std::vector<float *> &targetData,
bool addToResultBuffers = false) = 0;
protected:
AudioFileType m_type; // AudioFile type
AudioFileId m_id; // AudioFile ID
std::string m_name; // AudioFile name (not filename)
unsigned int m_bitsPerSample;
unsigned int m_sampleRate;
unsigned int m_channels;
// How many bytes do we read before we get to the data?
// Could be huge so we make it a long long. -1 means it
// hasn't been set yet.
//
long long m_dataChunkIndex;
QFileInfo *m_fileInfo;
};
}
#endif // _AUDIOFILE_H_
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