ref: e6d832a7218dbf4188be8d6ed20472e20e9ef037
dir: /libcelt/entenc.c/
/* (C) 2001-2008 Timothy B. Terriberry (C) 2008 Jean-Marc Valin */ /* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the Xiph.org Foundation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "os_support.h" #include "entenc.h" #include "arch.h" #define EC_BUFFER_INCREMENT (256) void ec_byte_writeinit_buffer(ec_byte_buffer *_b, unsigned char *_buf, long _size){ _b->ptr=_b->buf=_buf; _b->storage=_size; _b->resizable = 0; } void ec_byte_writeinit(ec_byte_buffer *_b){ _b->ptr=_b->buf=celt_alloc(EC_BUFFER_INCREMENT*sizeof(char)); _b->storage=EC_BUFFER_INCREMENT; _b->resizable = 1; } void ec_byte_writetrunc(ec_byte_buffer *_b,long _bytes){ _b->ptr=_b->buf+_bytes; } void ec_byte_write1(ec_byte_buffer *_b,unsigned _value){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte>=_b->storage){ if (_b->resizable){ _b->buf=celt_realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char)); _b->storage+=EC_BUFFER_INCREMENT; _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } *(_b->ptr++)=(unsigned char)_value; } void ec_byte_write4(ec_byte_buffer *_b,ec_uint32 _value){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte+4>_b->storage){ if (_b->resizable){ _b->buf=celt_realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char)); _b->storage+=EC_BUFFER_INCREMENT; _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; } void ec_byte_writecopy(ec_byte_buffer *_b,void *_source,long _bytes){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte+_bytes>_b->storage){ if (_b->resizable){ _b->storage=endbyte+_bytes+EC_BUFFER_INCREMENT; _b->buf=celt_realloc(_b->buf,_b->storage*sizeof(char)); _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } memmove(_b->ptr,_source,_bytes); _b->ptr+=_bytes; } void ec_byte_writeclear(ec_byte_buffer *_b){ celt_free(_b->buf); } void ec_enc_bits(ec_enc *_this,ec_uint32 _fl,int _ftb){ unsigned fl; unsigned ft; while(_ftb>EC_UNIT_BITS){ _ftb-=EC_UNIT_BITS; fl=(unsigned)(_fl>>_ftb)&EC_UNIT_MASK; ec_encode_bin(_this,fl,fl+1,EC_UNIT_BITS); } ft=1<<_ftb; fl=(unsigned)_fl&ft-1; ec_encode_bin(_this,fl,fl+1,_ftb); } void ec_enc_uint(ec_enc *_this,ec_uint32 _fl,ec_uint32 _ft){ unsigned ft; unsigned fl; int ftb; /*In order to optimize EC_ILOG(), it is undefined for the value 0.*/ celt_assert(_ft>1); _ft--; ftb=EC_ILOG(_ft); if(ftb>EC_UNIT_BITS){ ftb-=EC_UNIT_BITS; ft=(_ft>>ftb)+1; fl=(unsigned)(_fl>>ftb); ec_encode(_this,fl,fl+1,ft); ec_enc_bits(_this,_fl,ftb); } else { ec_encode(_this,_fl,_fl+1,_ft+1); } }