mirror of
https://github.com/mpv-player/mpv
synced 2024-12-09 08:29:42 +00:00
5f5e40c155
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14728 b3059339-0415-0410-9bf9-f77b7e298cf2
214 lines
4.9 KiB
C
214 lines
4.9 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003-2004 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: bits.c,v 1.37 2004/02/26 09:29:26 menno Exp $
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**/
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#include "common.h"
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#include "structs.h"
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#include <stdlib.h>
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#include <string.h>
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#include "bits.h"
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/* initialize buffer, call once before first getbits or showbits */
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void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size)
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{
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uint32_t tmp;
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if (ld == NULL)
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return;
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memset(ld, 0, sizeof(bitfile));
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if (buffer_size == 0 || _buffer == NULL)
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{
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ld->error = 1;
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ld->no_more_reading = 1;
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return;
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}
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ld->buffer = faad_malloc((buffer_size+12)*sizeof(uint8_t));
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memset(ld->buffer, 0, (buffer_size+12)*sizeof(uint8_t));
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memcpy(ld->buffer, _buffer, buffer_size*sizeof(uint8_t));
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ld->buffer_size = buffer_size;
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tmp = getdword((uint32_t*)ld->buffer);
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ld->bufa = tmp;
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tmp = getdword((uint32_t*)ld->buffer + 1);
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ld->bufb = tmp;
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ld->start = (uint32_t*)ld->buffer;
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ld->tail = ((uint32_t*)ld->buffer + 2);
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ld->bits_left = 32;
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ld->bytes_used = 0;
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ld->no_more_reading = 0;
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ld->error = 0;
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}
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void faad_endbits(bitfile *ld)
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{
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if (ld)
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{
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if (ld->buffer)
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{
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faad_free(ld->buffer);
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ld->buffer = NULL;
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}
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}
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}
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uint32_t faad_get_processed_bits(bitfile *ld)
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{
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return (uint32_t)(8 * (4*(ld->tail - ld->start) - 4) - (ld->bits_left));
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}
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uint8_t faad_byte_align(bitfile *ld)
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{
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uint8_t remainder = (uint8_t)((32 - ld->bits_left) % 8);
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if (remainder)
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{
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faad_flushbits(ld, 8 - remainder);
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return (8 - remainder);
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}
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return 0;
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}
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void faad_flushbits_ex(bitfile *ld, uint32_t bits)
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{
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uint32_t tmp;
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ld->bufa = ld->bufb;
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if (ld->no_more_reading == 0)
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{
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tmp = getdword(ld->tail);
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ld->tail++;
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} else {
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tmp = 0;
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}
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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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/* rewind to beginning */
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void faad_rewindbits(bitfile *ld)
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{
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uint32_t tmp;
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tmp = ld->start[0];
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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->bufa = tmp;
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tmp = ld->start[1];
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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;
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ld->tail = &ld->start[2];
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ld->bytes_used = 0;
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ld->no_more_reading = 0;
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}
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uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
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DEBUGDEC)
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{
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uint16_t i;
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uint8_t temp;
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uint16_t bytes = (uint16_t)bits / 8;
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uint8_t remainder = (uint8_t)bits % 8;
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uint8_t *buffer = (uint8_t*)faad_malloc((bytes+1)*sizeof(uint8_t));
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for (i = 0; i < bytes; i++)
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{
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buffer[i] = (uint8_t)faad_getbits(ld, 8 DEBUGVAR(print,var,dbg));
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}
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if (remainder)
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{
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temp = (uint8_t)faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder);
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buffer[bytes] = temp;
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}
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return buffer;
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}
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#ifdef DRM
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/* return the original data buffer */
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void *faad_origbitbuffer(bitfile *ld)
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{
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return (void*)ld->start;
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}
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/* return the original data buffer size */
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uint32_t faad_origbitbuffer_size(bitfile *ld)
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{
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return ld->buffer_size;
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}
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#endif
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/* reversed bit reading routines, used for RVLC and HCR */
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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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{
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uint32_t tmp;
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int32_t index;
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ld->buffer_size = bit2byte(bits_in_buffer);
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index = (bits_in_buffer+31)/32 - 1;
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ld->start = (uint32_t*)buffer + index - 2;
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tmp = getdword((uint32_t*)buffer + index);
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ld->bufa = tmp;
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tmp = getdword((uint32_t*)buffer + index - 1);
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ld->bufb = tmp;
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ld->tail = (uint32_t*)buffer + index;
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ld->bits_left = bits_in_buffer % 32;
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if (ld->bits_left == 0)
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ld->bits_left = 32;
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ld->bytes_used = 0;
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ld->no_more_reading = 0;
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ld->error = 0;
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}
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