2000-04-16 18:50:26 +00:00
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/*
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* Copyright (c) 1995 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose, without fee, and without written agreement is
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* hereby granted, provided that the above copyright notice and the following
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* two paragraphs appear in all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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/*
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* Portions of this software Copyright (c) 1995 Brown University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose, without fee, and without written agreement
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* is hereby granted, provided that the above copyright notice and the
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* following two paragraphs appear in all copies of this software.
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*
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* IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF BROWN
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* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* BROWN UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
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* BASIS, AND BROWN UNIVERSITY HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
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* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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/*
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Changes to make the code reentrant:
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deglobalized: curBits, curVidStream
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deglobalized: bitOffset, bitLength, bitBuffer in vid_stream, not used
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here
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Additional changes:
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-lsh@cs.brown.edu (Loring Holden)
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*/
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#ifndef __GST_GETBITS_INL_H__
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#define __GST_GETBITS_INL_H__
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#include <glib.h>
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2000-04-24 20:51:30 +00:00
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//#define GETBITS_DEBUG_ENABLED
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2000-05-01 23:09:46 +00:00
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//#define GETBITS_OVERRUN_ENABLED
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2000-04-16 18:50:26 +00:00
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2000-04-24 20:51:30 +00:00
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#ifdef GETBITS_DEBUG_ENABLED
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2000-04-16 18:50:26 +00:00
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#define debug2(format,args...) g_print(format,##args)
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#define debug(format,args...) g_print(format,##args),
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#else
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#define debug(format,args...)
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#define debug2(format,args...)
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#endif
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2000-05-01 23:09:46 +00:00
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#ifdef GETBITS_OVERRUN_ENABLED
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#define checklength2(src, dst) (((unsigned char*)src)<(dst)?0:printf("overrun !! %p>=%p %ld %s %d\n", (src), (dst), (gb)->bits, __PRETTY_FUNCTION__, __LINE__))
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#define checklength(src, dst) (((unsigned char*)src)<(dst)?0:printf("overrun !! %p>=%p %ld %s %d\n", (src), (dst), (gb)->bits, __PRETTY_FUNCTION__, __LINE__)),
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#else
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#define checklength(src, dst)
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#define checklength2(src, dst)
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#endif
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2000-04-16 18:50:26 +00:00
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#ifdef WORDS_BIGENDIAN
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# define swab32(x) (x)
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#else
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# if defined (__i386__)
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# define swab32(x) __i386_swab32(x)
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static inline const guint32 __i386_swab32(guint32 x)
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{
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__asm__("bswap %0" : "=r" (x) : "0" (x));
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return x;
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}
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# else
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# define swab32(x)\
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((((guint8*)&x)[0] << 24) | (((guint8*)&x)[1] << 16) | \
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(((guint8*)&x)[2] << 8) | (((guint8*)&x)[3]))
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# endif
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#endif
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/* External declarations for bitstream i/o operations. */
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extern unsigned long gst_getbits_nBitMask[];
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#define gst_getbits_init(gb)
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2000-05-01 23:09:46 +00:00
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#define gst_getbits_newbuf(gb, buffer, len) \
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2000-04-16 18:50:26 +00:00
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{ \
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2000-04-16 23:33:13 +00:00
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(gb)->longptr = (unsigned long *)(buffer); \
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2000-05-01 23:09:46 +00:00
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(gb)->endptr = (unsigned char *)buffer+len; \
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(gb)->length = len; \
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2000-04-16 18:50:26 +00:00
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(gb)->bits = 0; \
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(gb)->dword = swab32(*(gb)->longptr); \
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}
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#define gst_getbits_bitoffset(gb) \
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( \
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debug("bitoffset: %ld %p\n", (gb)->bits, (gb)->longptr) \
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(gb)->bits \
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)
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#define gst_getbits_bufferpos(gb) ((gb)->longptr)
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2000-05-01 23:09:46 +00:00
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#define gst_getbits_bytesleft(gb) ((gb)->endptr - (unsigned char*)(gb)->longptr)
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#define gst_getbits_bitsleft(gb) (((gb)->endptr - (unsigned char*)(gb)->longptr)*8 - (gb)->bits)
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2000-04-16 18:50:26 +00:00
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#define gst_getbits1(gb) \
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( \
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((gb)->temp = (((gb)->dword & 0x80000000) != 0)), \
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(gb)->dword <<= 1, \
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(gb)->bits++, \
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\
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((gb)->bits & 0x20 ? ( \
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(gb)->bits = 0, \
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(gb)->longptr++, \
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2000-05-01 23:09:46 +00:00
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checklength((gb)->longptr, (gb)->endptr) \
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2000-04-16 18:50:26 +00:00
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((gb)->dword = swab32(*(gb)->longptr)) \
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) \
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:0), \
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debug("getbits1 : %04lx %08lx %p\n", (gb)->temp, (gb)->dword, (gb)->longptr) \
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(gb)->temp \
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)
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#define gst_getbits2(gb) \
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( \
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(gb)->bits += 2, \
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\
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((gb)->bits & 0x20 ? ( \
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(gb)->bits -= 32, \
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(gb)->longptr++, \
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2000-05-01 23:09:46 +00:00
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checklength((gb)->longptr, (gb)->endptr) \
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2000-04-16 18:50:26 +00:00
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((gb)->bits ? ( \
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((gb)->dword |= \
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2000-04-16 23:33:13 +00:00
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(swab32(*(gb)->longptr) >> (2 - (gb)->bits))) \
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2000-04-16 18:50:26 +00:00
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) \
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: 0 \
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2000-04-16 23:33:13 +00:00
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),( \
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2000-04-16 18:50:26 +00:00
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((gb)->temp = (((gb)->dword & 0xc0000000) >> 30)), \
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2000-04-16 23:33:13 +00:00
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((gb)->dword = swab32(*(gb)->longptr) << (gb)->bits)) \
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2000-04-16 18:50:26 +00:00
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) \
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: ( \
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((gb)->temp = (((gb)->dword & 0xc0000000) >> 30)), \
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((gb)->dword <<= 2) \
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) \
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), \
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debug("getbits2 : %04lx %08lx %p\n", (gb)->temp, (gb)->dword, (gb)->longptr) \
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(gb)->temp \
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)
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#define gst_getbitsX(gb, num, mask, shift) \
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( \
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2000-04-16 23:33:13 +00:00
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(gb)->bits += (num), \
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2000-04-16 18:50:26 +00:00
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\
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((gb)->bits & 0x20 ? ( \
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(gb)->bits -= 32, \
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(gb)->longptr++, \
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2000-05-01 23:09:46 +00:00
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checklength((gb)->longptr, (gb)->endptr) \
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2000-04-16 18:50:26 +00:00
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((gb)->bits ? ( \
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((gb)->dword |= (swab32(*(gb)->longptr) >> \
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2000-04-16 23:33:13 +00:00
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((num) - (gb)->bits))) \
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2000-04-16 18:50:26 +00:00
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) \
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:0 \
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), \
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2000-04-16 23:33:13 +00:00
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((gb)->temp = (((gb)->dword & (mask)) >> (shift))), \
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2000-04-16 18:50:26 +00:00
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((gb)->dword = swab32(*(gb)->longptr) << (gb)->bits) \
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) \
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: ( \
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((gb)->temp = (((gb)->dword & mask) >> shift)), \
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2000-04-16 23:33:13 +00:00
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((gb)->dword <<= (num)) \
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2000-04-16 18:50:26 +00:00
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) \
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), \
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debug("getbits%-2d: %04lx %08lx %lu %p\n", num, (gb)->temp, (gb)->dword, mask, (gb)->longptr) \
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(gb)->temp \
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)
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#define gst_getbits3(gb) gst_getbitsX(gb, 3, 0xe0000000UL, 29)
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#define gst_getbits4(gb) gst_getbitsX(gb, 4, 0xf0000000UL, 28)
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#define gst_getbits5(gb) gst_getbitsX(gb, 5, 0xf8000000UL, 27)
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#define gst_getbits6(gb) gst_getbitsX(gb, 6, 0xfc000000UL, 26)
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#define gst_getbits7(gb) gst_getbitsX(gb, 7, 0xfe000000UL, 25)
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#define gst_getbits8(gb) gst_getbitsX(gb, 8, 0xff000000UL, 24)
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#define gst_getbits9(gb) gst_getbitsX(gb, 9, 0xff800000UL, 23)
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#define gst_getbits10(gb) gst_getbitsX(gb, 10, 0xffc00000UL, 22)
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#define gst_getbits11(gb) gst_getbitsX(gb, 11, 0xffe00000UL, 21)
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#define gst_getbits12(gb) gst_getbitsX(gb, 12, 0xfff00000UL, 20)
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#define gst_getbits13(gb) gst_getbitsX(gb, 13, 0xfff80000UL, 19)
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#define gst_getbits14(gb) gst_getbitsX(gb, 14, 0xfffc0000UL, 18)
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#define gst_getbits15(gb) gst_getbitsX(gb, 15, 0xfffe0000UL, 17)
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#define gst_getbits16(gb) gst_getbitsX(gb, 16, 0xffff0000UL, 16)
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#define gst_getbits17(gb) gst_getbitsX(gb, 17, 0xffff8000UL, 15)
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#define gst_getbits18(gb) gst_getbitsX(gb, 18, 0xffffc000UL, 14)
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#define gst_getbits19(gb) gst_getbitsX(gb, 19, 0xffffe000UL, 13)
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#define gst_getbits20(gb) gst_getbitsX(gb, 20, 0xfffff000UL, 12)
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#define gst_getbits21(gb) gst_getbitsX(gb, 21, 0xfffff800UL, 11)
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#define gst_getbits22(gb) gst_getbitsX(gb, 22, 0xfffffc00UL, 10)
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#define gst_getbits32(gb) gst_getbitsX(gb, 32, 0xffffffffUL, 0)
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2000-04-16 23:33:13 +00:00
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#define gst_getbitsn(gb,num) gst_getbitsX(gb, (num), ((num) ? ((0xffffffffUL) << (32-(num))):0), (32-(num)))
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2000-04-16 18:50:26 +00:00
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#define gst_showbits32(gb) \
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( \
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((gb)->bits ? ( \
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(gb)->dword | (swab32(*((gb)->longptr+1)) >> \
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(32 - (gb)->bits)) \
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) \
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: ( \
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(gb)->dword \
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) \
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) \
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)
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#define gst_showbitsX(gb, num, mask, shift) \
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( \
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((gb)->temp = (gb)->bits + num), \
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((gb)->temp > 32 ? ( \
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(gb)->temp -= 32, \
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(((gb)->dword & mask) >> shift) | \
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(swab32(*((gb)->longptr+1)) >> (shift + (num - (gb)->temp))) \
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) \
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: ( \
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(((gb)->dword & mask) >> shift) \
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) \
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) \
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)
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#define gst_showbits1(gb) gst_showbitsX(gb, 1, 0x80000000, 31)
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#define gst_showbits2(gb) gst_showbitsX(gb, 2, 0xc0000000, 30)
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#define gst_showbits3(gb) gst_showbitsX(gb, 3, 0xe0000000, 29)
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#define gst_showbits4(gb) gst_showbitsX(gb, 4, 0xf0000000, 28)
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#define gst_showbits5(gb) gst_showbitsX(gb, 5, 0xf8000000, 27)
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#define gst_showbits6(gb) gst_showbitsX(gb, 6, 0xfc000000, 26)
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#define gst_showbits7(gb) gst_showbitsX(gb, 7, 0xfe000000, 25)
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#define gst_showbits8(gb) gst_showbitsX(gb, 8, 0xff000000, 24)
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#define gst_showbits9(gb) gst_showbitsX(gb, 9, 0xff800000, 23)
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#define gst_showbits10(gb) gst_showbitsX(gb, 10, 0xffc00000, 22)
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#define gst_showbits11(gb) gst_showbitsX(gb, 11, 0xffe00000, 21)
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#define gst_showbits12(gb) gst_showbitsX(gb, 12, 0xfff00000, 20)
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#define gst_showbits13(gb) gst_showbitsX(gb, 13, 0xfff80000, 19)
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#define gst_showbits14(gb) gst_showbitsX(gb, 14, 0xfffc0000, 18)
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#define gst_showbits15(gb) gst_showbitsX(gb, 15, 0xfffe0000, 17)
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#define gst_showbits16(gb) gst_showbitsX(gb, 16, 0xffff0000, 16)
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#define gst_showbits17(gb) gst_showbitsX(gb, 17, 0xffff8000, 15)
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#define gst_showbits18(gb) gst_showbitsX(gb, 18, 0xffffc000, 14)
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#define gst_showbits19(gb) gst_showbitsX(gb, 19, 0xffffe000, 13)
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#define gst_showbits20(gb) gst_showbitsX(gb, 20, 0xfffff000, 12)
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#define gst_showbits21(gb) gst_showbitsX(gb, 21, 0xfffff800, 11)
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#define gst_showbits22(gb) gst_showbitsX(gb, 22, 0xfffffc00, 10)
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#define gst_showbits23(gb) gst_showbitsX(gb, 23, 0xfffffe00, 9)
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#define gst_showbits24(gb) gst_showbitsX(gb, 24, 0xffffff00, 8)
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#define gst_showbits25(gb) gst_showbitsX(gb, 25, 0xffffff80, 7)
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#define gst_showbits26(gb) gst_showbitsX(gb, 26, 0xffffffc0, 6)
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#define gst_showbits27(gb) gst_showbitsX(gb, 27, 0xffffffe0, 5)
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#define gst_showbits28(gb) gst_showbitsX(gb, 28, 0xfffffff0, 4)
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#define gst_showbits29(gb) gst_showbitsX(gb, 29, 0xfffffff8, 3)
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#define gst_showbits30(gb) gst_showbitsX(gb, 30, 0xfffffffc, 2)
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#define gst_showbits31(gb) gst_showbitsX(gb, 31, 0xfffffffe, 1)
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#define gst_showbitsn(gb,num) gst_showbitsX(gb, (num), ((0xffffffff) << (32-num)), (32-(num)))
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#define gst_flushbits32(gb) \
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{ \
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(gb)->longptr++; \
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2000-05-01 23:09:46 +00:00
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checklength2((gb)->longptr, (gb)->endptr); \
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2000-04-16 18:50:26 +00:00
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(gb)->dword = swab32(*(gb)->longptr) << (gb)->bits; \
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}
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2000-08-14 10:11:04 +00:00
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#define gst_flushbitsn(gb, num) \
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2000-04-16 18:50:26 +00:00
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{ \
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(gb)->bits += num; \
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\
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if ((gb)->bits & 0x20) { \
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(gb)->bits -= 32; \
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(gb)->longptr++; \
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2000-05-01 23:09:46 +00:00
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checklength2((gb)->longptr, (gb)->endptr); \
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2000-04-16 18:50:26 +00:00
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(gb)->dword = swab32(*(gb)->longptr) << (gb)->bits; \
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} \
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else { \
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(gb)->dword <<= num; \
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} \
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2000-04-16 23:33:13 +00:00
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debug2("flushbits%-2d: %08lx %p\n", num, (gb)->dword, (gb)->longptr); \
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2000-04-16 18:50:26 +00:00
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}
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#define gst_backbits24(gb) \
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{ \
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(gb)->bits -= 24; \
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if ((gb)->bits < 0) { \
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(gb)->bits += 32; \
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(gb)->longptr--; \
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} \
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(gb)->dword = swab32(*(gb)->longptr) << (gb)->bits; \
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}
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#define gst_backbitsn(gb, num) \
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{ \
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(gb)->bits -= num; \
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while ((gb)->bits < 0) { \
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(gb)->bits += 32; \
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(gb)->longptr--; \
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} \
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(gb)->dword = swab32(*(gb)->longptr) << (gb)->bits; \
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debug2("backbits%-2d: %08lx %p\n", num, (gb)->dword, (gb)->longptr); \
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}
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#endif /* __GST_GETBITS_INL_H__ */
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