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77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function: packing variable sized words into an octet stream
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last mod: $Id: bitwise.c 7675 2004-09-01 00:34:39Z xiphmont $
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********************************************************************/
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#if !defined(_bitwise_H)
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# define _bitwise_H (1)
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# include <ogg/ogg.h>
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void theorapackB_reset(oggpack_buffer *b);
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void theorapackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes);
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/* Read in bits without advancing the bitptr; bits <= 32 */
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static int theorapackB_look(oggpack_buffer *b,int bits,long *_ret);
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int theorapackB_look1(oggpack_buffer *b,long *_ret);
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static void theorapackB_adv(oggpack_buffer *b,int bits);
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void theorapackB_adv1(oggpack_buffer *b);
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/* bits <= 32 */
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int theorapackB_read(oggpack_buffer *b,int bits,long *_ret);
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int theorapackB_read1(oggpack_buffer *b,long *_ret);
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long theorapackB_bytes(oggpack_buffer *b);
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long theorapackB_bits(oggpack_buffer *b);
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unsigned char *theorapackB_get_buffer(oggpack_buffer *b);
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/*These two functions are only used in one place, and declaring them static so
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they can be inlined saves considerable function call overhead.*/
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/* Read in bits without advancing the bitptr; bits <= 32 */
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static int theorapackB_look(oggpack_buffer *b,int bits,long *_ret){
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long ret;
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long m;
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m=32-bits;
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bits+=b->endbit;
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if(b->endbyte+4>=b->storage){
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/* not the main path */
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if(b->endbyte>=b->storage){
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*_ret=0L;
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return -1;
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}
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/*If we have some bits left, but not enough, return the ones we have.*/
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if((b->storage-b->endbyte)*8<bits)bits=(b->storage-b->endbyte)*8;
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}
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ret=b->ptr[0]<<(24+b->endbit);
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if(bits>8){
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ret|=b->ptr[1]<<(16+b->endbit);
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if(bits>16){
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ret|=b->ptr[2]<<(8+b->endbit);
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if(bits>24){
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ret|=b->ptr[3]<<(b->endbit);
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if(bits>32&&b->endbit)
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ret|=b->ptr[4]>>(8-b->endbit);
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}
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}
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}
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*_ret=((ret&0xffffffff)>>(m>>1))>>((m+1)>>1);
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return 0;
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}
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static void theorapackB_adv(oggpack_buffer *b,int bits){
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bits+=b->endbit;
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b->ptr+=bits/8;
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b->endbyte+=bits/8;
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b->endbit=bits&7;
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}
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#endif
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