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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* AudaSpace is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AudaSpace 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#ifndef AUD_FFMPEGREADER
#define AUD_FFMPEGREADER
#include "AUD_ConverterFunctions.h"
#include "AUD_IReader.h"
#include "AUD_Reference.h"
#include "AUD_Buffer.h"
#include <string>
struct AVCodecContext;
extern "C" {
#include <libavformat/avformat.h>
}
/**
* This class reads a sound file via ffmpeg.
* \warning Seeking may not be accurate! Moreover the position is updated after
* a buffer reading call. So calling getPosition right after seek
* normally results in a wrong value.
* \warning Playback of an ogg with some outdated ffmpeg versions results in a
* segfault on windows.
*/
class AUD_FFMPEGReader : public AUD_IReader
{
private:
/**
* The current position in samples.
*/
int m_position;
/**
* The playback buffer.
*/
AUD_Buffer m_buffer;
/**
* The specification of the audio data.
*/
AUD_DeviceSpecs m_specs;
/**
* The buffer for package reading.
*/
AUD_Buffer m_pkgbuf;
/**
* The count of samples still available from the last read package.
*/
int m_pkgbuf_left;
/**
* The AVFormatContext structure for using ffmpeg.
*/
AVFormatContext* m_formatCtx;
/**
* The AVCodecContext structure for using ffmpeg.
*/
AVCodecContext* m_codecCtx;
/**
* The ByteIOContext to read the data from.
*/
ByteIOContext* m_byteiocontext;
/**
* The stream ID in the file.
*/
int m_stream;
/**
* Converter function.
*/
AUD_convert_f m_convert;
/**
* The memory file to read from, only saved to keep the buffer alive.
*/
AUD_Reference<AUD_Buffer> m_membuffer;
/**
* Decodes a packet into the given buffer.
* \param packet The AVPacket to decode.
* \param buffer The target buffer.
* \return The count of read bytes.
*/
int decode(AVPacket* packet, AUD_Buffer& buffer);
/**
* Initializes the object.
*/
void init();
// hide copy constructor and operator=
AUD_FFMPEGReader(const AUD_FFMPEGReader&);
AUD_FFMPEGReader& operator=(const AUD_FFMPEGReader&);
public:
/**
* Creates a new reader.
* \param filename The path to the file to be read.
* \exception AUD_Exception Thrown if the file specified does not exist or
* cannot be read with ffmpeg.
*/
AUD_FFMPEGReader(std::string filename);
/**
* Creates a new reader.
* \param buffer The buffer to read from.
* \exception AUD_Exception Thrown if the buffer specified cannot be read
* with ffmpeg.
*/
AUD_FFMPEGReader(AUD_Reference<AUD_Buffer> buffer);
/**
* Destroys the reader and closes the file.
*/
virtual ~AUD_FFMPEGReader();
virtual bool isSeekable() const;
virtual void seek(int position);
virtual int getLength() const;
virtual int getPosition() const;
virtual AUD_Specs getSpecs() const;
virtual void read(int & length, sample_t* & buffer);
};
#endif //AUD_FFMPEGREADER
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