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/*************************************************************************
MP3Decoder.h - decoder for MP3 data
-------------------
begin : Wed Aug 07 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 MP3_DECODER_H
#define MP3_DECODER_H
#include "config.h"
#include <mad.h> // needs libmad-devel package
#include <id3/globals.h>
#include <QString>
#include "libkwave/Decoder.h"
#include "libkwave/FileInfo.h"
#include "ID3_PropertyMap.h"
class ID3_Frame;
class ID3_Tag;
class QWidget;
namespace Kwave
{
class MP3Decoder: public Kwave::Decoder
{
public:
/** Constructor */
MP3Decoder();
/** Destructor */
~MP3Decoder() 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;
/** Callback for filling libmad's input buffer */
enum mad_flow fillInput(struct mad_stream *stream);
/** Calback for processing libmad's output */
enum mad_flow processOutput(void *data,
struct mad_header const *header,
struct mad_pcm *pcm);
/** Callback for handling stream errors */
enum mad_flow handleError(void *data, struct mad_stream *stream,
struct mad_frame *frame);
private:
/** parse MP3 headers */
bool parseMp3Header(const Mp3_Headerinfo &header, QWidget *widget);
/** parse all known ID3 tags */
bool parseID3Tags(ID3_Tag &tag);
/**
* parse a ID3 frame into a string
* @param frame a ID3 frame
* @return QString with the content
*/
QString parseId3Frame2String(const ID3_Frame *frame);
private:
/** property - to - ID3 mapping */
ID3_PropertyMap m_property_map;
/** source of the raw mp3 data */
QIODevice *m_source;
/** destination of the audio data */
Kwave::MultiWriter *m_dest;
/** buffer for libmad */
unsigned char *m_buffer;
/** size of m_buffer in bytes */
int m_buffer_size;
/** number of prepended bytes / id3v2 tag */
size_t m_prepended_bytes;
/** number of appended bytes / id3v1 tag */
size_t m_appended_bytes;
/** number of failures */
unsigned int m_failures;
/** widget used for displaying error messages */
QWidget *m_parent_widget;
};
}
#endif /* MP3_DECODER_H */
//***************************************************************************
//***************************************************************************
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