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Diffstat (limited to 'libfaad2/bits.h')
| -rw-r--r-- | libfaad2/bits.h | 385 |
1 files changed, 0 insertions, 385 deletions
diff --git a/libfaad2/bits.h b/libfaad2/bits.h deleted file mode 100644 index f66d5a6d36..0000000000 --- a/libfaad2/bits.h +++ /dev/null @@ -1,385 +0,0 @@ -/* -** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding -** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com -** -** 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. -** -** Any non-GPL usage of this software or parts of this software is strictly -** forbidden. -** -** Commercial non-GPL licensing of this software is possible. -** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. -** -** Initially modified for use with MPlayer by Arpad Gereöffy on 2003/08/30 -** $Id$ -** detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/ -** local_changes.diff contains the exact changes to this file. -**/ - -#ifndef __BITS_H__ -#define __BITS_H__ - -#ifdef __cplusplus -extern "C" { -#endif - -#include "analysis.h" -#ifdef ANALYSIS -#include <stdio.h> -#endif - -#define BYTE_NUMBIT 8 -#define bit2byte(a) ((a+7)/BYTE_NUMBIT) - -typedef struct _bitfile -{ - /* bit input */ - uint32_t bufa; - uint32_t bufb; - uint32_t bits_left; - uint32_t buffer_size; /* size of the buffer in bytes */ - uint32_t bytes_used; - uint8_t no_more_reading; - uint8_t error; - uint32_t *tail; - uint32_t *start; - void *buffer; -} bitfile; - - -#if defined (_WIN32) && !defined(_WIN32_WCE) && !defined(__MINGW32__) -#define BSWAP(a) __asm mov eax,a __asm bswap eax __asm mov a, eax -#elif defined(LINUX) || defined(DJGPP) -#define BSWAP(a) __asm__ ( "bswapl %0\n" : "=r" (a) : "0" (a) ) -#else -#define BSWAP(a) \ - ((a) = ( ((a)&0xff)<<24) | (((a)&0xff00)<<8) | (((a)>>8)&0xff00) | (((a)>>24)&0xff)) -#endif - -static uint32_t bitmask[] = { - 0x0, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, - 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, - 0x1FFFF, 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF, - 0x7FFFFF, 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, 0x7FFFFFF, - 0xFFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF - /* added bitmask 32, correct?!?!?! */ - , 0xFFFFFFFF -}; - -void faad_initbits(bitfile *ld, const void *buffer, const uint32_t buffer_size); -void faad_endbits(bitfile *ld); -void faad_initbits_rev(bitfile *ld, void *buffer, - uint32_t bits_in_buffer); -uint8_t faad_byte_align(bitfile *ld); -uint32_t faad_get_processed_bits(bitfile *ld); -void faad_flushbits_ex(bitfile *ld, uint32_t bits); -void faad_rewindbits(bitfile *ld); -uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits - DEBUGDEC); -#ifdef DRM -void *faad_origbitbuffer(bitfile *ld); -uint32_t faad_origbitbuffer_size(bitfile *ld); -#endif - -/* circumvent memory alignment errors on ARM */ -static INLINE uint32_t getdword(void *mem) -{ -#ifdef ARM - uint32_t tmp; -#ifndef ARCH_IS_BIG_ENDIAN - ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[3]; - ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[2]; - ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[1]; - ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[0]; -#else - ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[0]; - ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[1]; - ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[2]; - ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[3]; -#endif - - return tmp; -#else - uint32_t tmp; - tmp = *(uint32_t*)mem; -#ifndef ARCH_IS_BIG_ENDIAN - BSWAP(tmp); -#endif - return tmp; -#endif -} - -static INLINE uint32_t faad_showbits(bitfile *ld, uint32_t bits) -{ - if (bits <= ld->bits_left) - { - return (ld->bufa >> (ld->bits_left - bits)) & bitmask[bits]; - } - - bits -= ld->bits_left; - return ((ld->bufa & bitmask[ld->bits_left]) << bits) | (ld->bufb >> (32 - bits)); -} - -static INLINE void faad_flushbits(bitfile *ld, uint32_t bits) -{ - /* do nothing if error */ - if (ld->error != 0) - return; - - if (bits < ld->bits_left) - { - ld->bits_left -= bits; - } else { - faad_flushbits_ex(ld, bits); - } -} - -/* return next n bits (right adjusted) */ -static INLINE uint32_t faad_getbits(bitfile *ld, uint32_t n DEBUGDEC) -{ - uint32_t ret; - - if (ld->no_more_reading || n == 0) - return 0; - - ret = faad_showbits(ld, n); - faad_flushbits(ld, n); - -#ifdef ANALYSIS - if (print) - fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg); -#endif - - return ret; -} - -static INLINE uint8_t faad_get1bit(bitfile *ld DEBUGDEC) -{ - uint8_t r; - - if (ld->bits_left > 0) - { - ld->bits_left--; - r = (uint8_t)((ld->bufa >> ld->bits_left) & 1); - return r; - } - - /* bits_left == 0 */ -#if 0 - r = (uint8_t)(ld->bufb >> 31); - faad_flushbits_ex(ld, 1); -#else - r = (uint8_t)faad_getbits(ld, 1); -#endif - return r; -} - -/* reversed bitreading routines */ -static INLINE uint32_t faad_showbits_rev(bitfile *ld, uint32_t bits) -{ - uint8_t i; - uint32_t B = 0; - - if (bits <= ld->bits_left) - { - for (i = 0; i < bits; i++) - { - if (ld->bufa & (1 << (i + (32 - ld->bits_left)))) - B |= (1 << (bits - i - 1)); - } - return B; - } else { - for (i = 0; i < ld->bits_left; i++) - { - if (ld->bufa & (1 << (i + (32 - ld->bits_left)))) - B |= (1 << (bits - i - 1)); - } - for (i = 0; i < bits - ld->bits_left; i++) - { - if (ld->bufb & (1 << (i + (32-ld->bits_left)))) - B |= (1 << (bits - ld->bits_left - i - 1)); - } - return B; - } -} - -static INLINE void faad_flushbits_rev(bitfile *ld, uint32_t bits) -{ - /* do nothing if error */ - if (ld->error != 0) - return; - - if (bits < ld->bits_left) - { - ld->bits_left -= bits; - } else { - uint32_t tmp; - - ld->bufa = ld->bufb; - tmp = getdword(ld->start); - ld->bufb = tmp; - ld->start--; - ld->bits_left += (32 - bits); - - ld->bytes_used += 4; - if (ld->bytes_used == ld->buffer_size) - ld->no_more_reading = 1; - if (ld->bytes_used > ld->buffer_size) - ld->error = 1; - } -} - -static INLINE uint32_t faad_getbits_rev(bitfile *ld, uint32_t n - DEBUGDEC) -{ - uint32_t ret; - - if (ld->no_more_reading) - return 0; - - if (n == 0) - return 0; - - ret = faad_showbits_rev(ld, n); - faad_flushbits_rev(ld, n); - -#ifdef ANALYSIS - if (print) - fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg); -#endif - - return ret; -} - -#ifdef DRM -static uint8_t faad_check_CRC(bitfile *ld, uint16_t len) -{ - uint8_t CRC; - uint16_t r=255; /* Initialize to all ones */ - - /* CRC polynome used x^8 + x^4 + x^3 + x^2 +1 */ -#define GPOLY 0435 - - faad_rewindbits(ld); - - CRC = (uint8_t) ~faad_getbits(ld, 8 - DEBUGVAR(1,999,"faad_check_CRC(): CRC")); /* CRC is stored inverted */ - - for (; len>0; len--) - { - r = ( (r << 1) ^ (( ( faad_get1bit(ld - DEBUGVAR(1,998,"")) & 1) ^ ((r >> 7) & 1)) * GPOLY )) & 0xFF; - } - - if (r != CRC) - { - return 8; - } else { - return 0; - } -} - -static uint8_t tabFlipbits[256] = { - 0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240, - 8,136,72,200,40,168,104,232,24,152,88,216,56,184,120,248, - 4,132,68,196,36,164,100,228,20,148,84,212,52,180,116,244, - 12,140,76,204,44,172,108,236,28,156,92,220,60,188,124,252, - 2,130,66,194,34,162,98,226,18,146,82,210,50,178,114,242, - 10,138,74,202,42,170,106,234,26,154,90,218,58,186,122,250, - 6,134,70,198,38,166,102,230,22,150,86,214,54,182,118,246, - 14,142,78,206,46,174,110,238,30,158,94,222,62,190,126,254, - 1,129,65,193,33,161,97,225,17,145,81,209,49,177,113,241, - 9,137,73,201,41,169,105,233,25,153,89,217,57,185,121,249, - 5,133,69,197,37,165,101,229,21,149,85,213,53,181,117,245, - 13,141,77,205,45,173,109,237,29,157,93,221,61,189,125,253, - 3,131,67,195,35,163,99,227,19,147,83,211,51,179,115,243, - 11,139,75,203,43,171,107,235,27,155,91,219,59,187,123,251, - 7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247, - 15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255 -}; -#endif - -#ifdef ERROR_RESILIENCE - -/* Modified bit reading functions for HCR */ - -typedef struct -{ - /* bit input */ - uint32_t bufa; - uint32_t bufb; - int8_t len; -} bits_t; - - -static INLINE uint32_t showbits_hcr(bits_t *ld, uint8_t bits) -{ - if (bits == 0) return 0; - if (ld->len <= 32) - { - /* huffman_spectral_data_2 needs to read more than may be available, bits maybe - > ld->len, deliver 0 than */ - if (ld->len >= bits) - return ((ld->bufa >> (ld->len - bits)) & (0xFFFFFFFF >> (32 - bits))); - else - return ((ld->bufa << (bits - ld->len)) & (0xFFFFFFFF >> (32 - bits))); - } else { - if ((ld->len - bits) < 32) - { - return ( (ld->bufb & (0xFFFFFFFF >> (64 - ld->len))) << (bits - ld->len + 32)) | - (ld->bufa >> (ld->len - bits)); - } else { - return ((ld->bufb >> (ld->len - bits - 32)) & (0xFFFFFFFF >> (32 - bits))); - } - } -} - -/* return 1 if position is outside of buffer, 0 otherwise */ -static INLINE int8_t flushbits_hcr( bits_t *ld, uint8_t bits) -{ - ld->len -= bits; - - if (ld->len <0) - { - ld->len = 0; - return 1; - } else { - return 0; - } -} - -static INLINE int8_t getbits_hcr(bits_t *ld, uint8_t n, uint32_t *result) -{ - *result = showbits_hcr(ld, n); - return flushbits_hcr(ld, n); -} - -static INLINE int8_t get1bit_hcr(bits_t *ld, uint8_t *result) -{ - uint32_t res; - int8_t ret; - - ret = getbits_hcr(ld, 1, &res); - *result = (int8_t)(res & 1); - return ret; -} - -#endif - - -#ifdef __cplusplus -} -#endif -#endif |