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/*************************************************************************
OggDecoder.h - decoder for Ogg/Vorbis data
-------------------
begin : Tue Sep 10 2002
copyright : (C) 2002 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef OGG_DECODER_H
#define OGG_DECODER_H
#include "config.h"
#include <ogg/ogg.h>
#include "libkwave/Decoder.h"
#include "libkwave/FileInfo.h"
namespace Kwave
{
class OggSubDecoder;
class OggDecoder: public Kwave::Decoder
{
public:
/** Constructor */
OggDecoder();
/** Destructor */
~OggDecoder() override;
/** Returns a new instance of the decoder */
Kwave::Decoder *instance() override;
/**
* Opens the source and decodes the header information.
* @param widget a widget that can be used for displaying
* message boxes or dialogs
* @param source file or other source with a stream of bytes
* @return true if succeeded, false on errors
*/
bool open(QWidget *widget, QIODevice &source) override;
/**
* Decodes a stream of bytes into a MultiWriter
* @param widget a widget that can be used for displaying
* message boxes or dialogs
* @param dst MultiWriter that receives the audio data
* @return true if succeeded, false on errors
*/
virtual bool decode(QWidget *widget, Kwave::MultiWriter &dst)
override;
/**
* Closes the source.
*/
void close() override;
protected:
/**
* Try to parse header frames.
* @param widget a QWidget for displaying error messages
* @return -1 for error (return false)
* 1 if ready to continue
*/
int parseHeader(QWidget *widget);
private:
/** sub decoder, can be Vorbis, Opus, Speex or whatever... */
Kwave::OggSubDecoder *m_sub_decoder;
/** source of the audio data */
QIODevice *m_source;
/** sync and verify incoming physical bitstream */
ogg_sync_state m_oy;
/** take physical pages, weld into a logical stream of packets */
ogg_stream_state m_os;
/** one Ogg bitstream page. Vorbis packets are inside */
ogg_page m_og;
/** one raw packet of data for decode */
ogg_packet m_op;
};
}
#endif /* OGG_DECODER_H */
//***************************************************************************
//***************************************************************************
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