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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#pragma once
#include "IReader.h"
#ifdef LIBSNDFILE_PLUGIN
#define AUD_BUILD_PLUGIN
#endif
/**
* @file SndFileReader.h
* @ingroup plugin
* The SndFileReader class.
*/
#include <string>
#include <sndfile.h>
#include <memory>
AUD_NAMESPACE_BEGIN
class Buffer;
/**
* This class reads a sound file via libsndfile.
*/
class AUD_PLUGIN_API SndFileReader : public IReader
{
private:
/**
* The current position in samples.
*/
int m_position;
/**
* The sample count in the file.
*/
int m_length;
/**
* Whether the file is seekable.
*/
bool m_seekable;
/**
* The specification of the audio data.
*/
Specs m_specs;
/**
* The sndfile.
*/
SNDFILE* m_sndfile;
/**
* The virtual IO structure for memory file reading.
*/
SF_VIRTUAL_IO m_vio;
/**
* The pointer to the memory file.
*/
std::shared_ptr<Buffer> m_membuffer;
/**
* The current reading pointer of the memory file.
*/
int m_memoffset;
// Functions for libsndfile virtual IO functionality
AUD_LOCAL static sf_count_t vio_get_filelen(void* user_data);
AUD_LOCAL static sf_count_t vio_seek(sf_count_t offset, int whence, void* user_data);
AUD_LOCAL static sf_count_t vio_read(void* ptr, sf_count_t count, void* user_data);
AUD_LOCAL static sf_count_t vio_tell(void* user_data);
// delete copy constructor and operator=
SndFileReader(const SndFileReader&) = delete;
SndFileReader& operator=(const SndFileReader&) = delete;
public:
/**
* Creates a new reader.
* \param filename The path to the file to be read.
* \exception Exception Thrown if the file specified does not exist or
* cannot be read with libsndfile.
*/
SndFileReader(std::string filename);
/**
* Creates a new reader.
* \param buffer The buffer to read from.
* \exception Exception Thrown if the buffer specified cannot be read
* with libsndfile.
*/
SndFileReader(std::shared_ptr<Buffer> buffer);
/**
* Destroys the reader and closes the file.
*/
virtual ~SndFileReader();
virtual bool isSeekable() const;
virtual void seek(int position);
virtual int getLength() const;
virtual int getPosition() const;
virtual Specs getSpecs() const;
virtual void read(int& length, bool& eos, sample_t* buffer);
};
AUD_NAMESPACE_END
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