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/***************************************************************************
* Based on mq3 and madplay projects *
* *
* Copyright (c) 2000-2001 Brad Hughes <bhughes@trolltech.com> *
* Copyright (C) 2000-2004 Robert Leslie <rob@mars.org> *
* Copyright (C) 2009-2012 Ilya Kotov forkotov02@hotmail.ru *
* *
* 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. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef DECODER_MAD_H
#define DECODER_MAD_H
class QIODevice;
class DecoderMAD;
#include <qmmp/decoder.h>
#include "decodermadfactory.h"
extern "C"
{
#include <mad.h>
}
class DecoderMAD : public Decoder
{
public:
DecoderMAD(QIODevice *i);
virtual ~DecoderMAD();
// standard decoder API
bool initialize();
qint64 totalTime();
int bitrate();
qint64 read(char *data, qint64 size);
void seek(qint64);
private:
// helper functions
qint64 madOutput(char *data, qint64 size);
bool fillBuffer();
void deinit();
bool findHeader();
bool findXingHeader(struct mad_bitptr, unsigned int);
uint findID3v2(uchar *data, ulong size);
bool m_inited, m_eof;
qint64 m_totalTime;
int m_channels, m_skip_frames;
uint m_bitrate;
long m_freq, m_len;
qint64 m_output_bytes, m_output_at;
// file input buffer
char *m_input_buf;
qint64 m_input_bytes;
// MAD decoder
struct
{
int flags;
unsigned long frames;
unsigned long bytes;
unsigned char toc[100];
long scale;
} xing;
enum
{
XING_FRAMES = 0x0001,
XING_BYTES = 0x0002,
XING_TOC = 0x0004,
XING_SCALE = 0x0008
};
struct audio_dither
{
mad_fixed_t error[3];
mad_fixed_t random;
};
struct mad_stream m_stream;
struct mad_frame m_frame;
struct mad_synth m_synth;
struct audio_dither m_left_dither, m_right_dither;
//converter functions
unsigned long prng(unsigned long state);
void clip(mad_fixed_t *sample);
long audio_linear_dither(unsigned int bits, mad_fixed_t sample, struct audio_dither *dither);
long audio_linear_round(unsigned int bits, mad_fixed_t sample);
};
#endif // DECODER_MAD_H
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