149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/* (C) 2001-2008 Timothy B. Terriberry
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(C) 2008 Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "os_support.h"
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#include "entenc.h"
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#include "arch.h"
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#define EC_BUFFER_INCREMENT (256)
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void ec_byte_writeinit_buffer(ec_byte_buffer *_b, unsigned char *_buf, long _size){
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_b->ptr=_b->buf=_buf;
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_b->storage=_size;
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_b->resizable = 0;
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}
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void ec_byte_writeinit(ec_byte_buffer *_b){
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_b->ptr=_b->buf=celt_alloc(EC_BUFFER_INCREMENT*sizeof(char));
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_b->storage=EC_BUFFER_INCREMENT;
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_b->resizable = 1;
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}
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void ec_byte_writetrunc(ec_byte_buffer *_b,long _bytes){
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_b->ptr=_b->buf+_bytes;
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}
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void ec_byte_write1(ec_byte_buffer *_b,unsigned _value){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte>=_b->storage){
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if (_b->resizable){
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_b->buf=celt_realloc(_b->buf,(int)(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char));
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_b->storage+=EC_BUFFER_INCREMENT;
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_b->ptr=_b->buf+endbyte;
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} else {
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celt_fatal("range encoder overflow\n");
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}
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}
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*(_b->ptr++)=(unsigned char)_value;
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}
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void ec_byte_write4(ec_byte_buffer *_b,ec_uint32 _value){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte+4>_b->storage){
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if (_b->resizable){
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_b->buf=celt_realloc(_b->buf,(int)(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char));
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_b->storage+=EC_BUFFER_INCREMENT;
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_b->ptr=_b->buf+endbyte;
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} else {
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celt_fatal("range encoder overflow\n");
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}
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}
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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}
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void ec_byte_writecopy(ec_byte_buffer *_b,void *_source,long _bytes){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte+_bytes>_b->storage){
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if (_b->resizable){
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_b->storage=endbyte+_bytes+EC_BUFFER_INCREMENT;
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_b->buf=celt_realloc(_b->buf,(int)_b->storage*sizeof(char));
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_b->ptr=_b->buf+endbyte;
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} else {
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celt_fatal("range encoder overflow\n");
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}
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}
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memmove(_b->ptr,_source,_bytes);
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_b->ptr+=_bytes;
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}
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void ec_byte_writeclear(ec_byte_buffer *_b){
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celt_free(_b->buf);
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}
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void ec_enc_bits(ec_enc *_this,ec_uint32 _fl,int _ftb){
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unsigned fl;
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unsigned ft;
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while(_ftb>EC_UNIT_BITS){
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_ftb-=EC_UNIT_BITS;
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fl=(unsigned)(_fl>>_ftb)&EC_UNIT_MASK;
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ec_encode_bin(_this,fl,fl+1,EC_UNIT_BITS);
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}
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ft=1<<_ftb;
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fl=(unsigned)_fl&ft-1;
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ec_encode_bin(_this,fl,fl+1,_ftb);
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}
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void ec_enc_uint(ec_enc *_this,ec_uint32 _fl,ec_uint32 _ft){
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unsigned ft;
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unsigned fl;
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int ftb;
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/*In order to optimize EC_ILOG(), it is undefined for the value 0.*/
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celt_assert(_ft>1);
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_ft--;
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ftb=EC_ILOG(_ft);
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if(ftb>EC_UNIT_BITS){
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ftb-=EC_UNIT_BITS;
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ft=(_ft>>ftb)+1;
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fl=(unsigned)(_fl>>ftb);
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ec_encode(_this,fl,fl+1,ft);
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ec_enc_bits(_this,_fl,ftb);
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} else {
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ec_encode(_this,_fl,_fl+1,_ft+1);
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}
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}
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