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- /*
- * @(#) ibitstream.h 1.4, last edit: 2/21/94 18:10:17
- * @(#) 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
-