1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libtheora/lib/bitpack.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,76 @@
1.4 +/********************************************************************
1.5 + * *
1.6 + * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
1.7 + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
1.8 + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
1.9 + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
1.10 + * *
1.11 + * THE OggTheora SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
1.12 + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
1.13 + * *
1.14 + ********************************************************************
1.15 +
1.16 + function: packing variable sized words into an octet stream
1.17 + last mod: $Id: bitwise.c 7675 2004-09-01 00:34:39Z xiphmont $
1.18 +
1.19 + ********************************************************************/
1.20 +#if !defined(_bitpack_H)
1.21 +# define _bitpack_H (1)
1.22 +# include <stddef.h>
1.23 +# include <limits.h>
1.24 +# include "internal.h"
1.25 +
1.26 +
1.27 +
1.28 +typedef size_t oc_pb_window;
1.29 +typedef struct oc_pack_buf oc_pack_buf;
1.30 +
1.31 +
1.32 +
1.33 +/*Custom bitpacker implementations.*/
1.34 +# if defined(OC_ARM_ASM)
1.35 +# include "arm/armbits.h"
1.36 +# endif
1.37 +
1.38 +# if !defined(oc_pack_read)
1.39 +# define oc_pack_read oc_pack_read_c
1.40 +# endif
1.41 +# if !defined(oc_pack_read1)
1.42 +# define oc_pack_read1 oc_pack_read1_c
1.43 +# endif
1.44 +# if !defined(oc_huff_token_decode)
1.45 +# define oc_huff_token_decode oc_huff_token_decode_c
1.46 +# endif
1.47 +
1.48 +# define OC_PB_WINDOW_SIZE ((int)sizeof(oc_pb_window)*CHAR_BIT)
1.49 +/*This is meant to be a large, positive constant that can still be efficiently
1.50 + loaded as an immediate (on platforms like ARM, for example).
1.51 + Even relatively modest values like 100 would work fine.*/
1.52 +# define OC_LOTS_OF_BITS (0x40000000)
1.53 +
1.54 +
1.55 +
1.56 +struct oc_pack_buf{
1.57 + const unsigned char *stop;
1.58 + const unsigned char *ptr;
1.59 + oc_pb_window window;
1.60 + int bits;
1.61 + int eof;
1.62 +};
1.63 +
1.64 +void oc_pack_readinit(oc_pack_buf *_b,unsigned char *_buf,long _bytes);
1.65 +int oc_pack_look1(oc_pack_buf *_b);
1.66 +void oc_pack_adv1(oc_pack_buf *_b);
1.67 +/*Here we assume 0<=_bits&&_bits<=32.*/
1.68 +long oc_pack_read_c(oc_pack_buf *_b,int _bits);
1.69 +int oc_pack_read1_c(oc_pack_buf *_b);
1.70 +/* returns -1 for read beyond EOF, or the number of whole bytes available */
1.71 +long oc_pack_bytes_left(oc_pack_buf *_b);
1.72 +
1.73 +/*These two functions are implemented locally in huffdec.c*/
1.74 +/*Read in bits without advancing the bitptr.
1.75 + Here we assume 0<=_bits&&_bits<=32.*/
1.76 +/*static int oc_pack_look(oc_pack_buf *_b,int _bits);*/
1.77 +/*static void oc_pack_adv(oc_pack_buf *_b,int _bits);*/
1.78 +
1.79 +#endif
