mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 15:52:25 +00:00
e24087509a
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10990 b3059339-0415-0410-9bf9-f77b7e298cf2
360 lines
9.3 KiB
C
360 lines
9.3 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) && !defined(__GNUC__)
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#define BSWAP(a) __asm mov eax,a __asm bswap eax __asm mov a, eax
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#elif defined(ARCH_X86) && (defined(DJGPP) || defined(__GNUC__))
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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_flushbits_ex(bitfile *ld, uint32_t bits);
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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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}
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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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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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faad_flushbits_ex(ld, bits);
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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 || 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 DRM
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static uint8_t faad_check_CRC(bitfile *ld, uint16_t len)
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{
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uint8_t CRC;
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uint16_t r=255; /* Initialize to all ones */
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/* CRC polynome used x^8 + x^4 + x^3 + x^2 +1 */
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#define GPOLY 0435
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faad_rewindbits(ld);
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CRC = ~faad_getbits(ld, 8
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DEBUGVAR(1,999,"faad_check_CRC(): CRC")); /* CRC is stored inverted */
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for (; len>0; len--)
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{
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r = ( (r << 1) ^ (( ( faad_get1bit(ld
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DEBUGVAR(1,998,"")) & 1) ^ ((r >> 7) & 1)) * GPOLY )) & 0xFF;
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}
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if (r != CRC)
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{
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return 8;
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} else {
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return 0;
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}
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}
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static uint8_t tabFlipbits[256] = {
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0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240,
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8,136,72,200,40,168,104,232,24,152,88,216,56,184,120,248,
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4,132,68,196,36,164,100,228,20,148,84,212,52,180,116,244,
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12,140,76,204,44,172,108,236,28,156,92,220,60,188,124,252,
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2,130,66,194,34,162,98,226,18,146,82,210,50,178,114,242,
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10,138,74,202,42,170,106,234,26,154,90,218,58,186,122,250,
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6,134,70,198,38,166,102,230,22,150,86,214,54,182,118,246,
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14,142,78,206,46,174,110,238,30,158,94,222,62,190,126,254,
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1,129,65,193,33,161,97,225,17,145,81,209,49,177,113,241,
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9,137,73,201,41,169,105,233,25,153,89,217,57,185,121,249,
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5,133,69,197,37,165,101,229,21,149,85,213,53,181,117,245,
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13,141,77,205,45,173,109,237,29,157,93,221,61,189,125,253,
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3,131,67,195,35,163,99,227,19,147,83,211,51,179,115,243,
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11,139,75,203,43,171,107,235,27,155,91,219,59,187,123,251,
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7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247,
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15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255
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};
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#endif
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#ifdef ERROR_RESILIENCE
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/* Modified bit reading functions for HCR */
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typedef struct
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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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int8_t len;
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} bits_t;
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static INLINE uint32_t showbits_hcr(bits_t *ld, uint8_t bits)
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{
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if (bits == 0) return 0;
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if (ld->len <= 32)
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{
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/* huffman_spectral_data_2 needs to read more than may be available, bits maybe
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> ld->len, deliver 0 than */
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if (ld->len >= bits)
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return ((ld->bufa >> (ld->len - bits)) & (0xFFFFFFFF >> (32 - bits)));
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else
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return ((ld->bufa << (bits - ld->len)) & (0xFFFFFFFF >> (32 - bits)));
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} else {
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if ((ld->len - bits) < 32)
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{
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return ( (ld->bufb & (0xFFFFFFFF >> (64 - ld->len))) << (bits - ld->len + 32)) |
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(ld->bufa >> (ld->len - bits));
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} else {
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return ((ld->bufb >> (ld->len - bits - 32)) & (0xFFFFFFFF >> (32 - bits)));
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}
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}
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}
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/* return 1 if position is outside of buffer, 0 otherwise */
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static INLINE int8_t flushbits_hcr( bits_t *ld, uint8_t bits)
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{
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ld->len -= bits;
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if (ld->len <0)
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{
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ld->len = 0;
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return 1;
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} else {
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return 0;
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}
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}
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static INLINE int8_t getbits_hcr(bits_t *ld, uint8_t n, uint32_t *result)
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{
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*result = showbits_hcr(ld, n);
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return flushbits_hcr(ld, n);
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}
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static INLINE int8_t get1bit_hcr(bits_t *ld, uint8_t *result)
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{
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uint32_t res;
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int8_t ret;
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ret = getbits_hcr(ld, 1, &res);
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*result = (int8_t)(res & 1);
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return ret;
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}
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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