OpenCores
URL https://opencores.org/ocsvn/mpeg2fpga/mpeg2fpga/trunk

Subversion Repositories mpeg2fpga

[/] [mpeg2fpga/] [trunk/] [tools/] [mpeg2dec/] [CHANGES] - Blame information for rev 2

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 2 kdv
CHANGES
2
----------
3
December 8, 1998
4
- Rewrote X11 support to allow 8bpp, 15bpp, 16bpp, 24bpp, 32bpp
5
- 8bpp switched from dithered to grayscale since most people have
6
  >8bpp these days: helps framerate for those with low-end machines
7
 
8
January 9, 1996 to July 17, 1996
9
- cleaned up some code which gave warnings.
10
- altered some code to be compatible with Sun CC compiler.
11
  However, support in the makefile for non-ansi C compilers
12
  has been dropped (this is a stupid thing to support).
13
 
14
December 20, 1995 to January 9, 1996:
15
 
16
verified on HHI #22, TCEH #23 bitstreams.
17
 
18
 1. new arguments format.  Got to be so many argument fields that
19
    a new more consistent format was devised.
20
 
21
 2. Frame_Store_Flag (-f) option now controls lower layer prediciton
22
    picture format (field or framewise)
23
 
24
 3. getpic() structural changes
25
 
26
 
27
Since December 18, 1995:
28
 
29
1. added special case for current B pictures subsframe.c which
30
   loads entire reference frame for buffer substitution.
31
 
32
2. fixed -l omission (-lXext) in Makefile that drives Tristan nuts everytime.
33
 
34
 
35
Since December 14, 1995:
36
 
37
 1. organized frame buffer substitution routines into subspic.c
38
 2. added "big file" -b mode for Tristan ;-)
39
 
40
 
41
Since July 4, 1994:
42
 
43
1. Concatenated elementary sequences within same bitstream
44
 
45
   Decode can now handle concatenated elementary video sequences of
46
   arbitrary parameters.
47
 
48
2. TRACE and VERBOSE #ifdef flags
49
 
50
3. More disciplined naming convention
51
 
52
   normative variables and bitstream elements defined in 13818 are
53
   verbatim, lower case.  Implementation specific routines and variables
54
   are capitolized.
55
 
56
4. Spatial scalability corrections
57
   - see Carsten's document (spatscal.doc)
58
 
59
5. D-pictures (picture_coding_type==D_TYPE)
60
 
61
   Only two small changes were necessary to accomodate D-pictures:
62
 
63
    a. in Decode_MPEG1_Intra_Block() added line which termines
64
       subroutine after DC coefficient has been processed.
65
 
66
    b. in picture_data(), added line which parses marker bit.
67
 
68
 
69
 6. forced decoder to display frame progressively (regardless of whether
70
    the picture is frame structured or field structured) when -f flag
71
    is invoked in the command line arguements.
72
 
73
    also: progressive_frame now decides whether a frame is to be displayed
74
     as a frame picture to two field pictures, rather than the older convention
75
     of testing progressive_sequence.
76
 
77
 7. Adapted systems parser from Stefan's mpeg2play to mpeg2decode.
78
    The major changes are:
79
 
80
    mpeg2dec.c:
81
     - fseek() called twice
82
 
83
    gethdr.c, getpic.c:
84
     instances of Flush_Bits(par,32) changed to Flush_Bits32(par)
85
 
86
    gethdr.c
87
     Get_Bits(par,32) changed to Get_32_Bits(par)
88
 
89
    global.h
90
      added rdmax, sysstream, and bfr[] to parameters struct.
91
 
92
 8. Restructuring of getpic.c:
93
 
94
      a. moved picture pointer rotation into Update_Picture_Buffers()
95
      b. moved picture output logic into Output_Current_Frame() to
96
         in anticipation of 3:2 pulldown
97
 
98
 
99
 

powered by: WebSVN 2.1.0

© copyright 1999-2019 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.