From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/libfaad/bits.c | 271 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 faad2/src/libfaad/bits.c (limited to 'faad2/src/libfaad/bits.c') diff --git a/faad2/src/libfaad/bits.c b/faad2/src/libfaad/bits.c new file mode 100644 index 0000000..66c6a13 --- /dev/null +++ b/faad2/src/libfaad/bits.c @@ -0,0 +1,271 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2005 M. Bakker, Nero 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. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: bits.c,v 1.44 2007/11/01 12:33:29 menno Exp $ +**/ + +#include "common.h" +#include "structs.h" + +#include +#include "bits.h" + +/* initialize buffer, call once before first getbits or showbits */ +void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size) +{ + uint32_t tmp; + + if (ld == NULL) + return; + + // useless + //memset(ld, 0, sizeof(bitfile)); + + if (buffer_size == 0 || _buffer == NULL) + { + ld->error = 1; + return; + } + + ld->buffer = _buffer; + + ld->buffer_size = buffer_size; + ld->bytes_left = buffer_size; + + if (ld->bytes_left >= 4) + { + tmp = getdword((uint32_t*)ld->buffer); + ld->bytes_left -= 4; + } else { + tmp = getdword_n((uint32_t*)ld->buffer, ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufa = tmp; + + if (ld->bytes_left >= 4) + { + tmp = getdword((uint32_t*)ld->buffer + 1); + ld->bytes_left -= 4; + } else { + tmp = getdword_n((uint32_t*)ld->buffer + 1, ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufb = tmp; + + ld->start = (uint32_t*)ld->buffer; + ld->tail = ((uint32_t*)ld->buffer + 2); + + ld->bits_left = 32; + + ld->error = 0; +} + +void faad_endbits(bitfile *ld) +{ + // void +} + +uint32_t faad_get_processed_bits(bitfile *ld) +{ + return (uint32_t)(8 * (4*(ld->tail - ld->start) - 4) - (ld->bits_left)); +} + +uint8_t faad_byte_align(bitfile *ld) +{ + int remainder = (32 - ld->bits_left) & 0x7; + + if (remainder) + { + faad_flushbits(ld, 8 - remainder); + return (uint8_t)(8 - remainder); + } + return 0; +} + +void faad_flushbits_ex(bitfile *ld, uint32_t bits) +{ + uint32_t tmp; + + ld->bufa = ld->bufb; + if (ld->bytes_left >= 4) + { + tmp = getdword(ld->tail); + ld->bytes_left -= 4; + } else { + tmp = getdword_n(ld->tail, ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufb = tmp; + ld->tail++; + ld->bits_left += (32 - bits); + //ld->bytes_left -= 4; +// if (ld->bytes_left == 0) +// ld->no_more_reading = 1; +// if (ld->bytes_left < 0) +// ld->error = 1; +} + +/* rewind to beginning */ +void faad_rewindbits(bitfile *ld) +{ + uint32_t tmp; + + ld->bytes_left = ld->buffer_size; + + if (ld->bytes_left >= 4) + { + tmp = getdword((uint32_t*)&ld->start[0]); + ld->bytes_left -= 4; + } else { + tmp = getdword_n((uint32_t*)&ld->start[0], ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufa = tmp; + + if (ld->bytes_left >= 4) + { + tmp = getdword((uint32_t*)&ld->start[1]); + ld->bytes_left -= 4; + } else { + tmp = getdword_n((uint32_t*)&ld->start[1], ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufb = tmp; + + ld->bits_left = 32; + ld->tail = &ld->start[2]; +} + +/* reset to a certain point */ +void faad_resetbits(bitfile *ld, int bits) +{ + uint32_t tmp; + int words = bits >> 5; + int remainder = bits & 0x1F; + + ld->bytes_left = ld->buffer_size - words*4; + + if (ld->bytes_left >= 4) + { + tmp = getdword(&ld->start[words]); + ld->bytes_left -= 4; + } else { + tmp = getdword_n(&ld->start[words], ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufa = tmp; + + if (ld->bytes_left >= 4) + { + tmp = getdword(&ld->start[words+1]); + ld->bytes_left -= 4; + } else { + tmp = getdword_n(&ld->start[words+1], ld->bytes_left); + ld->bytes_left = 0; + } + ld->bufb = tmp; + + ld->bits_left = 32 - remainder; + ld->tail = &ld->start[words+2]; + + /* recheck for reading too many bytes */ + ld->error = 0; +// if (ld->bytes_left == 0) +// ld->no_more_reading = 1; +// if (ld->bytes_left < 0) +// ld->error = 1; +} + +uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits + DEBUGDEC) +{ + int i; + unsigned int temp; + int bytes = bits >> 3; + int remainder = bits & 0x7; + + uint8_t *buffer = (uint8_t*)faad_malloc((bytes+1)*sizeof(uint8_t)); + + for (i = 0; i < bytes; i++) + { + buffer[i] = (uint8_t)faad_getbits(ld, 8 DEBUGVAR(print,var,dbg)); + } + + if (remainder) + { + temp = faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder); + + buffer[bytes] = (uint8_t)temp; + } + + return buffer; +} + +#ifdef DRM +/* return the original data buffer */ +void *faad_origbitbuffer(bitfile *ld) +{ + return (void*)ld->start; +} + +/* return the original data buffer size */ +uint32_t faad_origbitbuffer_size(bitfile *ld) +{ + return ld->buffer_size; +} +#endif + +/* reversed bit reading routines, used for RVLC and HCR */ +void faad_initbits_rev(bitfile *ld, void *buffer, + uint32_t bits_in_buffer) +{ + uint32_t tmp; + int32_t index; + + ld->buffer_size = bit2byte(bits_in_buffer); + + index = (bits_in_buffer+31)/32 - 1; + + ld->start = (uint32_t*)buffer + index - 2; + + tmp = getdword((uint32_t*)buffer + index); + ld->bufa = tmp; + + tmp = getdword((uint32_t*)buffer + index - 1); + ld->bufb = tmp; + + ld->tail = (uint32_t*)buffer + index; + + ld->bits_left = bits_in_buffer % 32; + if (ld->bits_left == 0) + ld->bits_left = 32; + + ld->bytes_left = ld->buffer_size; + ld->error = 0; +} + +/* EOF */ -- cgit v1.2.3