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/*
* @(#) ibitstream.h 1.5, last edit: 6/15/94 16:55:34
* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
* @(#) Berlin University of Technology
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef BITSTREAM_H
#define BITSTREAM_H
#include "all.h"
const uint32 bufferintsize = 433;
// max. 1730 bytes per frame: 144 * 384kbit/s / 32000 Hz + 2 Bytes CRC
// Class to extract bitstrings from files:
class Ibitstream
{
int fd;
uint32 buffer[bufferintsize];
uint32 framesize; // number of valid bytes in buffer
uint32 *wordpointer; // position of next unsigned int for get_bits()
uint32 bitindex; // number (0-31, from MSB to LSB) of next bit for get_bits()
public:
Ibitstream (int filedescriptor);
Ibitstream (const char *filename);
~Ibitstream (void);
int filedescriptor (void) { return fd; };
bool get_header (uint32 *);
// get next 32 bits from bitstream in an unsigned int,
// returned value False => end of stream
bool read_frame (uint32 bytesize);
// fill buffer with data from bitstream, returned value False => end of stream
uint32 get_bits (uint32 number_of_bits);
// read bits (1 <= number_of_bits <= 16) from buffer into the lower bits
// of an unsigned int. The LSB contains the latest read bit of the stream.
};
#endif
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