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/*************************************************************************
VorbisDecoder.h - sub decoder for Vorbis in an Ogg container
-------------------
begin : Wed Dec 26 2012
copyright : (C) 2012 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 VORBIS_DECODER_H
#define VORBIS_DECODER_H
#ifdef HAVE_OGG_VORBIS
#include "config.h"
#include <vorbis/codec.h>
#include "libkwave/FileInfo.h"
#include "libkwave/Sample.h"
#include "OggSubDecoder.h"
class QIODevice;
class QWidget;
namespace Kwave
{
class VorbisDecoder: public Kwave::OggSubDecoder
{
public:
/**
* Constructor
*
* @param source pointer to a QIODevice to read from, must not be null
* @param oy sync and verify incoming physical bitstream
* @param os take physical pages, weld into a logical stream of packets
* @param og one Ogg bitstream page, Vorbis packets are inside
* @param op one raw packet of data for decode
*/
explicit VorbisDecoder(QIODevice *source,
ogg_sync_state &oy,
ogg_stream_state &os,
ogg_page &og,
ogg_packet &op);
/** destructor */
~VorbisDecoder() override {}
/**
* parse the header of the stream and initialize the decoder
* @param widget a QWidget to be used as parent for error messages
* @param info reference to a FileInfo to fill
* @return -1 if failed or +1 if succeeded
*/
virtual int open(QWidget *widget, Kwave::FileInfo &info)
override;
/**
* decode received ogg data
* @param dst a MultiWriter to be used as sink
* @return -1 if failed or >= 0 if succeeded
*/
int decode(Kwave::MultiWriter &dst) override;
/** reset the stream info */
void reset() override;
/**
* finish the decoding, last chance to fix up some file info
* @param info reference to a FileInfo to fill
*/
void close(Kwave::FileInfo &info) override;
protected:
/**
* Searches for a vorbis comment and renders it into Kwave's FileInfo.
* If more than one occurrence is found, they are concatenated as a
* semicolon separated list.
* @param info the file info object to add the tag value
* @param tag name of the field to search for
* @param property specifies the FileProperty for storing the result
*/
void parseTag(Kwave::FileInfo &info, const char *tag,
Kwave::FileProperty property);
private:
/** IO device to read from */
QIODevice *m_source;
/** first stream with audio data */
qint64 m_stream_start_pos;
/** last known position in the output stream [samples] */
sample_index_t m_samples_written;
/** 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;
/** struct that stores all the static vorbis bitstream settings */
vorbis_info m_vi;
/** struct that stores all the bitstream user comments */
vorbis_comment m_vc;
/** central working state for the packet->PCM decoder */
vorbis_dsp_state m_vd;
/** local working space for packet->PCM decode */
vorbis_block m_vb;
};
}
#endif /* HAVE_OGG_VORBIS */
#endif /* VORBIS_DECODER_H */
//***************************************************************************
//***************************************************************************
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