/***************************************************************************
* 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) 2009-2020 Ilya Kotov forkotov02@ya.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
#include <mad.h>
#include <qmmp/decoder.h>
#include "decodermpegfactory.h"
class DecoderMAD : public Decoder
{
public:
explicit DecoderMAD(QIODevice *i);
virtual ~DecoderMAD();
// standard decoder API
bool initialize() override;
qint64 totalTime() const override;
int bitrate() const override;
qint64 read(unsigned char *data, qint64 size) override;
void seek(qint64) override;
private:
//LAME header
struct LameHeader
{
unsigned char revision;
unsigned char flags;
mad_fixed_t peak;
unsigned short start_delay;
unsigned short end_padding;
qint8 gain;
};
// helper functions
bool decodeFrame();
qint64 madOutputFloat(float *data, qint64 samples);
bool fillBuffer();
void deinit();
bool findHeader();
bool findXingHeader(struct mad_bitptr, unsigned int bitlen);
LameHeader *findLameHeader(struct mad_bitptr ptr, unsigned int bitlen);
uint findID3v2(uchar *data, ulong size);
bool m_inited = false, m_eof = false;
qint64 m_totalTime = 0;
int m_channels = 0, m_skip_frames = 0;
uint m_bitrate = 0;
long m_freq = 0, m_len = 0;
// file input buffer
char *m_input_buf = nullptr;
qint64 m_input_bytes = 0;
// MAD decoder
//xing header
struct XingHeader
{
int flags = 0;
unsigned long frames = 0;
unsigned long bytes = 0;
unsigned char toc[100] = { 0 };
long scale = 0;
LameHeader *lame = nullptr;
};
XingHeader m_xing;
enum
{
XING_FRAMES = 0x0001,
XING_BYTES = 0x0002,
XING_TOC = 0x0004,
XING_SCALE = 0x0008
};
struct mad_stream m_stream;
struct mad_frame m_frame;
struct mad_synth m_synth;
qint64 m_skip_bytes = 0, m_play_bytes = -1;
};
#endif // DECODER_MAD_H
