PEZW_ac.hpp
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上传日期:2007-02-02
资源大小:6116k
文件大小:6k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /****************************************************************************/
- /* MPEG4 Visual Texture Coding (VTC) Mode Software */
- /* */
- /* This software was jointly developed by the following participants: */
- /* */
- /* Single-quant, multi-quant and flow control */
- /* are provided by Sarnoff Corporation */
- /* Iraj Sodagar (iraj@sarnoff.com) */
- /* Hung-Ju Lee (hjlee@sarnoff.com) */
- /* Paul Hatrack (hatrack@sarnoff.com) */
- /* Shipeng Li (shipeng@sarnoff.com) */
- /* Bing-Bing Chai (bchai@sarnoff.com) */
- /* B.S. Srinivas (bsrinivas@sarnoff.com) */
- /* */
- /* Bi-level is provided by Texas Instruments */
- /* Jie Liang (liang@ti.com) */
- /* */
- /* Shape Coding is provided by OKI Electric Industry Co., Ltd. */
- /* Zhixiong Wu (sgo@hlabs.oki.co.jp) */
- /* Yoshihiro Ueda (yueda@hlabs.oki.co.jp) */
- /* Toshifumi Kanamaru (kanamaru@hlabs.oki.co.jp) */
- /* */
- /* OKI, Sharp, Sarnoff, TI and Microsoft contributed to bitstream */
- /* exchange and bug fixing. */
- /* */
- /* */
- /* In the course of development of the MPEG-4 standard, this software */
- /* module is an implementation of a part of one or more MPEG-4 tools as */
- /* specified by the MPEG-4 standard. */
- /* */
- /* The copyright of this software belongs to ISO/IEC. ISO/IEC gives use */
- /* of the MPEG-4 standard free license to use this software module or */
- /* modifications thereof for hardware or software products claiming */
- /* conformance to the MPEG-4 standard. */
- /* */
- /* Those intending to use this software module in hardware or software */
- /* products are advised that use may infringe existing patents. The */
- /* original developers of this software module and their companies, the */
- /* subsequent editors and their companies, and ISO/IEC have no liability */
- /* and ISO/IEC have no liability for use of this software module or */
- /* modification thereof in an implementation. */
- /* */
- /* Permission is granted to MPEG members to use, copy, modify, */
- /* and distribute the software modules ( or portions thereof ) */
- /* for standardization activity within ISO/IEC JTC1/SC29/WG11. */
- /* */
- /* Copyright 1995, 1996, 1997, 1998 ISO/IEC */
- /****************************************************************************/
- /****************************************************************************/
- /* Texas Instruments Predictive Embedded Zerotree (PEZW) Image Codec */
- /* Developed by Jie Liang (liang@ti.com) */
- /* */
- /* Copyright 1996, 1997, 1998 Texas Instruments */
- /****************************************************************************/
- /****************************************************************************
- File name: PEZW_ac.h
- Author: Jie Liang (liang@ti.com)
- Functions: header file for adaptive arithmetic coding functions
- Revisions: This file was adopted from public domain
- arithmetic coder with changes suited to PEZW coder.
- *****************************************************************************/
- #ifndef PEZW_AC_HEADER
- #define PEZW_AC_HEADER
- #include <stdio.h>
- typedef struct {
- FILE *fp;
- unsigned char *stream;
- long low;
- long high;
- long fbits;
- int buffer;
- int bits_to_go;
- long total_bits;
- /* buffer management */
- unsigned char *original_stream;
- int space_left; /* in bytes */
- } Ac_encoder;
- typedef struct {
- FILE *fp;
- unsigned char *stream;
- long value;
- long low;
- long high;
- int buffer;
- int bits_to_go;
- int garbage_bits;
- } Ac_decoder;
- typedef struct {
- int nsym;
- int Max_frequency;
- #ifndef MODEL_COUNT_LARGE
- unsigned char *freq;
- #else
- int *freq;
- #endif
- int *cfreq;
- int adapt;
- } Ac_model;
- void Ac_encoder_init (Ac_encoder *, unsigned char *, int, int);
- void Ac_encoder_done (Ac_encoder *);
- void Ac_decoder_open (Ac_decoder *, unsigned char *, int);
- void Ac_decoder_init (Ac_decoder *, unsigned char *);
- void Ac_decoder_done (Ac_decoder *);
- void Ac_model_init (Ac_model *, int, int *, int, int);
- void Ac_model_save (Ac_model *, int *);
- void Ac_model_done (Ac_model *);
- long Ac_encoder_bits (Ac_encoder *);
- void Ac_encode_symbol (Ac_encoder *, Ac_model *, int);
- int Ac_decode_symbol (Ac_decoder *, Ac_model *);
- int getc_buffer (unsigned char **buffer);
- void putc_buffer (int x, unsigned char **buffer_curr,
- unsigned char **buffer_start, int *space_len);
- int AC_decoder_buffer_adjust (Ac_decoder *acd);
- void AC_free_model (Ac_model *acm);
- #endif