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/*
Copyright (C) 2002 Hans Meine
[email protected]
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef GSLPP_DATAHANDLE_H
#define GSLPP_DATAHANDLE_H
#include <gsl/gsldatahandle.h>
#include <gsl/gslloader.h>
#include <string>
namespace GSL
{
class WaveFileInfo;
class WaveDataHandle;
class WaveDescription;
class DataHandle
{
protected:
GslDataHandle *handle_;
void clearHandle();
void copyFrom(const DataHandle &other);
DataHandle(GslDataHandle *handle);
public:
static DataHandle null() { return DataHandle(); }
DataHandle(): handle_(0) {}
DataHandle(const DataHandle &other);
DataHandle &operator =(const DataHandle &other);
bool operator ==(const DataHandle &other) const;
bool isNull() const;
virtual ~DataHandle();
/**
* returns error code with errno meaning
*/
virtual gint open();
virtual void close();
bool isOpen() const;
/**
* read from this datahandle and fill buffer pointed to by
* values with sample data from the range
* [valueOffset..valueOffset+valueCount-1]
*
* returns number of sample values actually read, -1 on error
* (errno _may_ be useful then)
*/
virtual GslLong read(GslLong valueOffset, GslLong valueCount, gfloat *values);
/**
* Create a new data handle by chopping off headCutValueCount
* values at the start, and tailCutValueCount values at the
* end of this data handle.
*/
DataHandle createCropped(GslLong headCutValueCount,
GslLong tailCutValueCount);
/**
* Create a new data handle by removing the values
* [cutOffset..cutOffset+cutValueCount-1].
*/
DataHandle createCut(GslLong cutOffset,
GslLong cutValueCount);
/**
* Create a new data handle which contains the same values as
* this one but in reversed order.
*/
DataHandle createReversed();
// this will maybe be made private in the future, having a
// better interface instead
GslDataCache *createGslDataCache();
GslLong valueCount() const;
guint bitDepth() const;
guint channelCount() const;
};
class WaveChunkDescription
{
friend class WaveDescription;
const GslWaveDsc *parent_;
guint parentIndex_;
WaveChunkDescription(const GslWaveDsc *parent, guint index);
public:
float oscillatorFrequency();
float mixerFrequency();
GslWaveLoopType loopType();
GslLong loopStart(); /* sample offset */
GslLong loopEnd(); /* sample offset */
guint loopCount();
WaveDataHandle createDataHandle();
};
class WaveDescription
{
friend class WaveFileInfo; // for construction of WaveDescriptions
mutable GslWaveFileInfo *parentInfo_; // mutable for ensurePointer()
std::string name_;
guint parentIndex_;
mutable GslWaveDsc *desc_;
mutable GslErrorType error_;
void ensurePointer() const; // lazy construction
void copyFrom(const WaveDescription &other);
WaveDescription(GslWaveFileInfo *parent, guint index, const std::string &name);
public:
~WaveDescription();
WaveDescription(const WaveDescription &other);
WaveDescription &operator =(const WaveDescription &other);
const std::string &name() const;
GslErrorType error() const;
guint chunkCount() const;
WaveChunkDescription chunkDescription(guint index) const;
guint channelCount() const;
};
class WaveFileInfo
{
GslWaveFileInfo *info_;
GslErrorType error_;
std::string filename_;
void copyFrom(const WaveFileInfo &other);
public:
WaveFileInfo(const std::string &filename);
~WaveFileInfo();
WaveFileInfo(const WaveFileInfo &other);
WaveFileInfo &operator =(const WaveFileInfo &other);
guint waveCount() const;
std::string waveName(guint index) const;
WaveDescription waveDescription(guint index);
GslErrorType error() const;
};
class WaveDataHandle: public DataHandle
{
friend class WaveChunkDescription;
GslErrorType error_;
float oscillatorFrequency_;
float mixerFrequency_;
WaveDataHandle();
WaveDataHandle(const GslWaveDsc *waveDesc, guint chunkIndex = 0);
public:
WaveDataHandle(const std::string& filename,
guint waveIndex = 0,
guint chunkIndex = 0);
static WaveDataHandle null() { return WaveDataHandle(); }
GslErrorType error() const;
float oscillatorFrequency() const;
float mixerFrequency() const;
};
}
#endif // GSLPP_DATAHANDLE_H
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