quant.hpp
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上传日期:2007-02-02
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文件大小:5k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /* $Id: quant.hpp,v 1.3 2001/04/30 20:44:07 dmackie Exp $ */
- /****************************************************************************/
- /* 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 */
- /****************************************************************************/
- /************************************************************/
- /* Sarnoff Very Low Bit Rate Still Image Coder */
- /* Copyright 1995, 1996, 1997, 1998 Sarnoff Corporation */
- /************************************************************/
- #ifndef QUANT_H
- #define QUANT_H
- /*
- State data structure for single-step quantizer and inverse quantizer.
- The Internals here don't need to be used directly.
- residualValue - In quantization it's the difference between the beginning
- of the quantization level and the actual value being quantized. If not
- in the dead zone then an absolute difference is used.
- In inverse quantization it's the beginning of the last quantization level.
- Beginning of dead zone defined as 0.
- partitionType - Bit field. Bit 0 is fromReduced. Bit 1 is fromDeadZone.
- fromReduced - It is set to 1 if the quantization level in the last step
- was reduced size (one less than the specified value by statePrevQ). It
- is set to 0 if the quantization level of last step was the full size,
- statePrevQ.
- fromDeadZone - It is set to 1 if the last step's quantization level was
- the dead zone around zero (level 0). Set to 0 otherwise.
- */
- typedef struct
- {
- Int residualValue;
- UChar partitionType;
- }
- quantState;
- #endif /* QUANT_H */