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/*************************************************************************
FlacDecoder.h - decoder for FLAC data
-------------------
begin : Tue Feb 28 2004
copyright : (C) 2004 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 FLAC_DECODER_H
#define FLAC_DECODER_H
#include "config.h"
#include <QList>
#include <QMap>
#include <QObject>
#include <QString>
#include <QStringList>
#include <FLAC++/decoder.h>
#include <FLAC++/metadata.h>
#include <FLAC/format.h>
#include "libkwave/Decoder.h"
#include "libkwave/FileInfo.h"
#include "libkwave/VorbisCommentMap.h"
class QWidget;
class QIODevice;
namespace Kwave
{
class FlacDecoder: public Kwave::Decoder,
protected FLAC::Decoder::Stream
{
public:
/** Constructor */
FlacDecoder();
/** Destructor */
~FlacDecoder() 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:
/**
* Parse information about the stream, like sample rate, resolution,
* channels etc...
*
* @param stream_info FLAC metadata with stream information
*/
void parseStreamInfo(const FLAC::Metadata::StreamInfo &stream_info);
/**
* Parse vorbis comments
*
* @param vorbis_comments list of vorbis comments, can be empty
*/
void parseVorbisComments(
const FLAC::Metadata::VorbisComment &vorbis_comments);
/**
* FLAC decoder interface: read callback.
*
* @param buffer the byte buffer to be filled
* @param bytes pointer with the number of bytes to be read,
* can be modified
* @return read state
*/
virtual ::FLAC__StreamDecoderReadStatus read_callback(
FLAC__byte buffer[], size_t *bytes) override;
/**
* FLAC decoder interface: write callback.
*
* @param frame a FLAC frame structure
* @param buffer a buffer that contains the decoded samples
* @return FLAC stream decoder write state
*/
virtual ::FLAC__StreamDecoderWriteStatus write_callback(
const ::FLAC__Frame *frame,
const FLAC__int32 *const buffer[]) override;
/**
* FLAC decoder interface: callback for processing meta data.
*
* @param metadata the FLAC meta data to be parsed
*/
virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata)
override;
/**
* FLAC decoder interface: error callback.
*
* @param status the FLAC status
*/
virtual void error_callback(::FLAC__StreamDecoderErrorStatus status)
override;
private:
/** source of the audio data */
QIODevice *m_source;
/** destination of the audio data */
Kwave::MultiWriter *m_dest;
/** map for translating vorbis comments to FileInfo properties */
Kwave::VorbisCommentMap m_vorbis_comment_map;
};
}
#endif /* FLAC_DECODER_H */
//***************************************************************************
//***************************************************************************
|
