H.264/AVC Reference Software Encoder: biariencode.h Source File

00001 
00002 /*!
00003  ***************************************************************************
00004  * \file
00005  *    biariencode.h
00006  *
00007  * \brief
00008  *    Headerfile for binary arithmetic encoding routines
00009  *
00010  * \author
00011  *    - Detlev Marpe
00012  *    - Gabi Blaettermann
00013  *    - Gunnar Marten
00014  *
00015  *    Copyright (C) 2000 HEINRICH HERTZ INSTITUTE All Rights Reserved.
00016  *
00017  * \date
00018  *    21. Oct 2000
00019  **************************************************************************
00020  */
00021 
00022 
00023 #ifndef _BIARIENCOD_H_
00024 #define _BIARIENCOD_H_
00025 
00026 
00027 /************************************************************************
00028  * D e f i n i t i o n s
00029  ***********************************************************************
00030  */
00031 
00032 // some definitions to increase the readability of the source code
00033 
00034 #define B_BITS         10    // Number of bits to represent the whole coding interval
00035 #define BITS_TO_LOAD   16
00036 #define MAX_BITS       26          //(B_BITS + BITS_TO_LOAD)
00037 #define MASK_BITS      18          //(MAX_BITS - 8)
00038 #define ONE            0x04000000  //(1 << MAX_BITS)
00039 #define ONE_M1         0x03FFFFFF  //(ONE - 1)
00040 #define HALF           0x01FE      //(1 << (B_BITS-1)) - 2
00041 #define QUARTER        0x0100      //(1 << (B_BITS-2))
00042 #define MIN_BITS_TO_GO 0
00043 #define B_LOAD_MASK    0xFFFF      // ((1<<BITS_TO_LOAD) - 1)
00044 
00045 extern int get_pic_bin_count(ImageParameters *p_Img);
00046 extern void reset_pic_bin_count(ImageParameters *p_Img);
00047 extern void set_pic_bin_count  (ImageParameters *p_Img, EncodingEnvironmentPtr eep);
00048 
00049 extern void arienco_start_encoding(EncodingEnvironmentPtr eep, unsigned char *code_buffer, int *code_len);
00050 extern void arienco_reset_EC      (EncodingEnvironmentPtr eep);
00051 extern void arienco_done_encoding (Macroblock *currMB, EncodingEnvironmentPtr eep);
00052 extern void biari_init_context    (int qp, BiContextTypePtr ctx, const char* ini);
00053 extern void biari_encode_symbol   (EncodingEnvironmentPtr eep, signed short symbol, BiContextTypePtr bi_ct );
00054 extern void biari_encode_symbol_eq_prob(EncodingEnvironmentPtr eep, signed short symbol);
00055 extern void biari_encode_symbol_final(EncodingEnvironmentPtr eep, signed short symbol);
00056 
00057 /*!
00058 ************************************************************************
00059 * \brief
00060 *    Returns the number of currently written bits
00061 ************************************************************************
00062 */
00063 static inline int arienco_bits_written(EncodingEnvironmentPtr eep)
00064 {
00065   return (((*eep->Ecodestrm_len) + eep->Epbuf + 1) << 3) + (eep->Echunks_outstanding * BITS_TO_LOAD) + BITS_TO_LOAD - eep->Ebits_to_go;
00066 }
00067 
00068 #endif  // BIARIENCOD_H
00069