mirror of
https://github.com/mpv-player/mpv
synced 2024-12-20 13:52:10 +00:00
32063c4339
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10726 b3059339-0415-0410-9bf9-f77b7e298cf2
261 lines
6.4 KiB
C
261 lines
6.4 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id$
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**/
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#ifndef __BITS_H__
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#define __BITS_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "analysis.h"
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#ifdef ANALYSIS
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#include <stdio.h>
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#endif
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#define BYTE_NUMBIT 8
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#define bit2byte(a) ((a+7)/BYTE_NUMBIT)
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typedef struct _bitfile
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{
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/* bit input */
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uint32_t bufa;
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uint32_t bufb;
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uint32_t bits_left;
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uint32_t buffer_size; /* size of the buffer in bytes */
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uint32_t bytes_used;
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uint8_t no_more_reading;
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uint8_t error;
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uint32_t *tail;
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uint32_t *start;
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void *buffer;
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} bitfile;
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#if defined (_WIN32) && !defined(_WIN32_WCE)
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#define BSWAP(a) __asm mov eax,a __asm bswap eax __asm mov a, eax
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#elif defined(LINUX) || defined(DJGPP)
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#define BSWAP(a) __asm__ ( "bswapl %0\n" : "=r" (a) : "0" (a) )
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#else
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#define BSWAP(a) \
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((a) = ( ((a)&0xff)<<24) | (((a)&0xff00)<<8) | (((a)>>8)&0xff00) | (((a)>>24)&0xff))
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#endif
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static uint32_t bitmask[] = {
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0x0, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF,
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0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
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0x1FFFF, 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF,
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0x7FFFFF, 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, 0x7FFFFFF,
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0xFFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF
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};
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void faad_initbits(bitfile *ld, void *buffer, uint32_t buffer_size);
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void faad_endbits(bitfile *ld);
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void faad_initbits_rev(bitfile *ld, void *buffer,
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uint32_t bits_in_buffer);
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uint8_t faad_byte_align(bitfile *ld);
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uint32_t faad_get_processed_bits(bitfile *ld);
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void faad_rewindbits(bitfile *ld);
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uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
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DEBUGDEC);
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/* circumvent memory alignment errors on ARM */
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static INLINE uint32_t getdword(void *mem)
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{
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#ifdef ARM
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uint32_t tmp;
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((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[0];
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((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[1];
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((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[2];
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((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[3];
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return tmp;
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#else
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return *(uint32_t*)mem;
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#endif
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}
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static INLINE uint32_t faad_showbits(bitfile *ld, uint32_t bits)
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{
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if (bits <= ld->bits_left)
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{
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return (ld->bufa >> (ld->bits_left - bits)) & bitmask[bits];
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} else {
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bits -= ld->bits_left;
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return ((ld->bufa & bitmask[ld->bits_left]) << bits) | (ld->bufb >> (32 - bits));
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}
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}
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static INLINE void faad_flushbits(bitfile *ld, uint32_t bits)
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{
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/* do nothing if error */
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if (ld->error != 0)
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return;
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if (bits < ld->bits_left)
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{
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ld->bits_left -= bits;
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} else {
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uint32_t tmp;
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ld->bufa = ld->bufb;
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tmp = getdword(ld->tail);
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ld->tail++;
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#ifndef ARCH_IS_BIG_ENDIAN
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BSWAP(tmp);
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#endif
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ld->bufb = tmp;
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ld->bits_left += (32 - bits);
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ld->bytes_used += 4;
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if (ld->bytes_used == ld->buffer_size)
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ld->no_more_reading = 1;
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if (ld->bytes_used > ld->buffer_size)
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ld->error = 1;
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}
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}
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/* return next n bits (right adjusted) */
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static INLINE uint32_t faad_getbits(bitfile *ld, uint32_t n DEBUGDEC)
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{
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uint32_t ret;
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if (ld->no_more_reading)
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return 0;
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if (n == 0)
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return 0;
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ret = faad_showbits(ld, n);
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faad_flushbits(ld, n);
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#ifdef ANALYSIS
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if (print)
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fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
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#endif
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return ret;
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}
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static INLINE uint8_t faad_get1bit(bitfile *ld DEBUGDEC)
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{
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uint8_t r;
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if (ld->bits_left == 0)
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return (uint8_t)faad_getbits(ld, 1 DEBUGVAR(print,var,dbg));
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ld->bits_left--;
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r = (uint8_t)((ld->bufa >> ld->bits_left) & 1);
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return r;
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}
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/* reversed bitreading routines */
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static INLINE uint32_t faad_showbits_rev(bitfile *ld, uint32_t bits)
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{
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uint8_t i;
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uint32_t B = 0;
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if (bits <= ld->bits_left)
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{
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for (i = 0; i < bits; i++)
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{
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if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
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B |= (1 << (bits - i - 1));
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}
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return B;
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} else {
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for (i = 0; i < ld->bits_left; i++)
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{
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if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
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B |= (1 << (bits - i - 1));
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}
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for (i = 0; i < bits - ld->bits_left; i++)
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{
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if (ld->bufb & (1 << (i + (32-ld->bits_left))))
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B |= (1 << (bits - ld->bits_left - i - 1));
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}
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return B;
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}
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}
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static INLINE void faad_flushbits_rev(bitfile *ld, uint32_t bits)
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{
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/* do nothing if error */
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if (ld->error != 0)
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return;
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if (bits < ld->bits_left)
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{
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ld->bits_left -= bits;
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} else {
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uint32_t tmp;
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ld->bufa = ld->bufb;
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tmp = getdword(ld->start);
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#ifndef ARCH_IS_BIG_ENDIAN
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BSWAP(tmp);
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#endif
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ld->bufb = tmp;
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ld->start--;
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ld->bits_left += (32 - bits);
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ld->bytes_used += 4;
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if (ld->bytes_used == ld->buffer_size)
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ld->no_more_reading = 1;
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if (ld->bytes_used > ld->buffer_size)
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ld->error = 1;
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}
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}
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static INLINE uint32_t faad_getbits_rev(bitfile *ld, uint32_t n
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DEBUGDEC)
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{
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uint32_t ret;
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if (ld->no_more_reading)
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return 0;
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if (n == 0)
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return 0;
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ret = faad_showbits_rev(ld, n);
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faad_flushbits_rev(ld, n);
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#ifdef ANALYSIS
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if (print)
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fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
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#endif
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return ret;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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