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