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mpeg_stream.h
Package: tcpmp.rar [view]
Upload User: wstnjxml
Upload Date: 2014-04-03
Package Size: 7248k
Code Size: 3k
Category:
Windows CE
Development Platform:
C/C++
- /*****************************************************************************
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * $Id: mpeg_stream.h 271 2005-08-09 08:31:35Z picard $
- *
- * The Core Pocket Media Player
- * Copyright (c) 2004-2005 Gabor Kovacs
- *
- ****************************************************************************/
- #ifndef __MPEG_STREAM_H
- #define __MPEG_STREAM_H
- #ifdef MIPS
- static INLINE void inlineloadbits( mpeg_decode* dec )
- {
- int n = dec->bitpos-8;
- if (n>=0)
- {
- const uint8_t* bitptr = dec->bitptr;
- int bits = dec->bits;
- do
- {
- bits = (bits << 8) | *bitptr++;
- n -= 8;
- }
- while (n>=0);
- dec->bits = bits;
- dec->bitptr = bitptr;
- dec->bitpos = n+8;
- }
- }
- #else
- #define inlineloadbits(dec) loadbits(dec)
- #endif
- // n=1..24 (or ..32 after bytealign)
- #define showbits(dec,n) ((uint32_t)(dec->bits << dec->bitpos) >> (32-(n)))
- #define flushbits(dec,n) dec->bitpos += n;
- // use this only in boolean expression. to get a 1 bit value use getbits(dec,1)
- #define getbits1(dec) ((dec->bits << dec->bitpos++) < 0)
- static INLINE int getbits(mpeg_decode* dec,int n)
- {
- int i = showbits(dec,n);
- flushbits(dec,n);
- return i;
- }
- static INLINE int eofbits(mpeg_decode* dec)
- {
- return dec->bitptr >= dec->bitend;
- }
- static INLINE void bytealign(mpeg_decode* dec)
- {
- dec->bitpos = (dec->bitpos + 7) & ~7;
- }
- static INLINE int bitstonextbyte(mpeg_decode* dec)
- {
- return 8-(dec->bitpos & 7);
- }
- static INLINE const uint8_t *bytepos(mpeg_decode* dec)
- {
- return dec->bitptr - 4 + ((dec->bitpos+7) >> 3);
- }
- //**************************************************************************
- #define loadbits_pos( dec, bitpos )
- bitpos -= 8;
- if (bitpos >= 0) {
- int bits = dec->bits;
- const uint8_t* bitptr = dec->bitptr;
- do {
- bits = (bits << 8) | *bitptr++;
- bitpos -= 8;
- } while (bitpos>=0);
- dec->bits = bits;
- dec->bitptr = bitptr;
- }
- bitpos += 8;
- #define showbits_pos(dec,bitpos,n) ((uint32_t)(dec->bits << bitpos) >> (32-(n)))
- #define flushbits_pos(dec,bitpos,n) bitpos += n
- #define getbits1_pos(dec,bitpos) ((dec->bits << bitpos++) < 0)
- #endif