| 0,0 → 1,45 |
|---|
| /* |
| getbits |
| |
| copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1 |
| see COPYING and AUTHORS files in distribution or http://mpg123.de |
| initially written by Michael Hipp |
| */ |
| |
| #ifndef _MPG123_GETBITS_H_ |
| #define _MPG123_GETBITS_H_ |
| |
| /* that's the same file as getits.c but with defines to |
| force inlining */ |
| |
| static unsigned long rval; |
| static unsigned char rval_uc; |
| |
| #define backbits(nob) ((void)( \ |
| bsi.bitindex -= nob, \ |
| bsi.wordpointer += (bsi.bitindex>>3), \ |
| bsi.bitindex &= 0x7 )) |
| |
| #define getbitoffset() ((-bsi.bitindex)&0x7) |
| #define getbyte() (*bsi.wordpointer++) |
| |
| #define getbits(nob) ( \ |
| rval = bsi.wordpointer[0], rval <<= 8, rval |= bsi.wordpointer[1], \ |
| rval <<= 8, rval |= bsi.wordpointer[2], rval <<= bsi.bitindex, \ |
| rval &= 0xffffff, bsi.bitindex += nob, \ |
| rval >>= (24-nob), bsi.wordpointer += (bsi.bitindex>>3), \ |
| bsi.bitindex &= 7,rval) |
| |
| #define getbits_fast(nob) ( \ |
| rval = (unsigned char) (bsi.wordpointer[0] << bsi.bitindex), \ |
| rval |= ((unsigned long) bsi.wordpointer[1]<<bsi.bitindex)>>8, \ |
| rval <<= nob, rval >>= 8, \ |
| bsi.bitindex += nob, bsi.wordpointer += (bsi.bitindex>>3), \ |
| bsi.bitindex &= 7, rval ) |
| |
| #define get1bit() ( \ |
| rval_uc = *bsi.wordpointer << bsi.bitindex, bsi.bitindex++, \ |
| bsi.wordpointer += (bsi.bitindex>>3), bsi.bitindex &= 7, rval_uc>>7 ) |
| |
| |
| #endif |