CHANGES
资源名称:mpeg2编解码.zip [点击查看]
上传用户:hkgotone
上传日期:2013-02-17
资源大小:293k
文件大小:3k
源码类别:
Windows Mobile
开发平台:
C/C++
- CHANGES
- ----------
- January 9, 1996 to July 17, 1996
- - cleaned up some code which gave warnings.
- - altered some code to be compatible with Sun CC compiler.
- However, support in the makefile for non-ansi C compilers
- has been dropped (this is a stupid thing to support).
- December 20, 1995 to January 9, 1996:
- verified on HHI #22, TCEH #23 bitstreams.
- 1. new arguments format. Got to be so many argument fields that
- a new more consistent format was devised.
- 2. Frame_Store_Flag (-f) option now controls lower layer prediciton
- picture format (field or framewise)
- 3. getpic() structural changes
- Since December 18, 1995:
- 1. added special case for current B pictures subsframe.c which
- loads entire reference frame for buffer substitution.
- 2. fixed -l omission (-lXext) in Makefile that drives Tristan nuts everytime.
- Since December 14, 1995:
- 1. organized frame buffer substitution routines into subspic.c
- 2. added "big file" -b mode for Tristan ;-)
- Since July 4, 1994:
- 1. Concatenated elementary sequences within same bitstream
- Decode can now handle concatenated elementary video sequences of
- arbitrary parameters.
- 2. TRACE and VERBOSE #ifdef flags
- 3. More disciplined naming convention
- normative variables and bitstream elements defined in 13818 are
- verbatim, lower case. Implementation specific routines and variables
- are capitolized.
- 4. Spatial scalability corrections
- - see Carsten's document (spatscal.doc)
- 5. D-pictures (picture_coding_type==D_TYPE)
- Only two small changes were necessary to accomodate D-pictures:
- a. in Decode_MPEG1_Intra_Block() added line which termines
- subroutine after DC coefficient has been processed.
- b. in picture_data(), added line which parses marker bit.
- 6. forced decoder to display frame progressively (regardless of whether
- the picture is frame structured or field structured) when -f flag
- is invoked in the command line arguements.
- also: progressive_frame now decides whether a frame is to be displayed
- as a frame picture to two field pictures, rather than the older convention
- of testing progressive_sequence.
- 7. Adapted systems parser from Stefan's mpeg2play to mpeg2decode.
- The major changes are:
- mpeg2dec.c:
- - fseek() called twice
- gethdr.c, getpic.c:
- instances of Flush_Bits(par,32) changed to Flush_Bits32(par)
- gethdr.c
- Get_Bits(par,32) changed to Get_32_Bits(par)
- global.h
- added rdmax, sysstream, and bfr[] to parameters struct.
- 8. Restructuring of getpic.c:
- a. moved picture pointer rotation into Update_Picture_Buffers()
- b. moved picture output logic into Output_Current_Frame() to
- in anticipation of 3:2 pulldown