changes

linux下将各类格式图片转换工具

Changes chronology
------------------
1.5b Release	August 1995
	- added date to default USER_DATA string
	- made prototypes happier
	- renamed SPECIFICS_FILE to CDL_FILE
	- fixed bit_rate param in constrained param setting (was too restrictive)
	- fixed obscure P-block motion vector bug
	- added a file name replication:
	    foo.ppm  [1-10] will make 10 copies of foo.ppm
	- generalized fopen calls to specify binary mode (MSDOG)
	- generalized times calls into elapsed_time to handle different library routines
	- fixed motion vector bug in bframes; skip block bug
	- fixed minor bugs in parallel, mpeg, main, iframe, param, ....
	- accepts extra whitespace at the end of lines in parameter files
	- "PIXEL FULL" bug in B-frames fixed (caused ghosting)
        - B-blocks "can I skip" rutine now looks at color too (more ghosting problems)
        - switched from JPEG4 to JPEG5 (if they crash for you,
                  do a -DJPEG4 for the encoder, and get jpeg4.tar.gz off our site)
        - combine server (parallel) waits longer for files to exist (
                         thanks to [e-mail])
	- killing the parallel server kills the clients!!!! ([e-mail])

1.5 Release	8 May 1995  Changes since version 1.3 release (to 1.5)
= BUG FIXES
	- removed SetBlocksPerSlice() from GOPStoMPEG
	- don't access bb after freeing
	- non-integer frame rates now work for all machines
	- fixed parsing of -mv_histogram
	- fixed numPadding bug (file name problem)
	- fixed full pixel assertation bug
        - corrected ASPECT_RATIO bug (was forced to 1)
	- buffer size is now set correctly
        - complains when file is too small
	- fixed bug with non-ranged INPUT_FILE names
	- forced MB at start/end of slice in P-frame bug fixed
	- Actually evaluates the constrained parameter settings
	- fixed a Cr/Cb mixup in bframe.c

= NEW FEATURES
	- rate control
	- optional B search range different from P range
	- can read images from stdin, allowing encoding on-the-fly
        - Does Y files (no U or V)
	- New way of specifying files `cmd`, like `ls jan-*-94`
	- Can encode Abekas and Phillips style YUV formats
	- gamma correction
	- added -realquiet mode
	- JMOVIE and JPEGv4 input format fully supported
        - -float_dct uses the (slower) double precision floating point DCT 
	- automatically identifies itself in (sequence header) userdata
	- enforced [0][0] entry of Intra Q-table to be 8
	- added Jim Boucher's resize code
        - added -mse flag to print mean squared error on a per-block basis
	- can specify Sequence header user data
        - prints version number
        - finds more skip blocks in GenBFrame
	- can generate multiple sequence headers (every N GOPs)

= SPEED IMPROVEMENTS


= MAINTENANCE
	- removed mpeg_jrevdct_sparse(), since it wasn't used
	- added CompileTests();
	- uses libpnmrw rather than entire pbmplus directory
        - redid RCS
        - reorganized [ipb]frame.c to make playing with rate controls easier

= PORTABILITY
	- added #ifdef's, #ifndef's LINUX'es to ease porting


Changes from 1.2 to 1.3
-----------------------
= BUG FIXES
	+ deletes frame files when done with them in parallel version
	+ fixed bug in ComputeFrameTable
	+ completion time estimation now is closer to actual time
	+ modified ComputeSNR to avoid overflow of varOrig
	+ fixed bug that caused I/P/B times on HP's to be wrong
	+ fixed bug that made TwoLevel search out of the search window
	+ fixed bug in -quiet 0
	+ fixed memory leak when using PNM files
	+ fixed bug:  crashed when CPU time was 0 (very rare)
	+ fixed bug in -gop option
	+ fixed bug in AppendFiles()

= NEW FEATURES
	+ added FORCE_ENCODE_LAST_FRAME option (allows encoding of all frames)
	+ added PARALLEL_CHUNK_TAPER option
	+ added -bit_rate_info option to show bit rate per frame
	+ added -mv_histogram option to show motion vector histogram
	+ custom quantization tables allowed
	+ can specify frame rate, aspect ratio

= SPEED IMPROVEMENTS
	+ replaced most remaining binary multiplies/divides with shifts
		(except those concerning negative numbers)

= MAINTENANCE
	+ got rid of & before array warning in block.c
	+ got rid of references to srandom, random in pbmplus.h
	+ undefine 'index' if defined as 'strchr' (since we use index as
	  variable name)
	+ modified frame type code to be more flexible

= PORTABILITY
	+ replaced all bzero() calls with memset() calls


1.2 Release	20 October 1993

Changes from 1.1 to 1.2
-----------------------
= BUG FIXES
	+ allow comments in PPM files
	+ first and last macroblocks in a slice may not be skipped macroblocks
	+ fixed YUV bug:  should be able to handle dimensions which
		aren't multiples of 16
	+ fixed the separate I/O conversion for parallel NFS version
	+ no_frame_summary can now be last option

= NEW FEATURES
	+ using DECODED frames as reference frames in parallel
	  version now works
	+ implemented multiple I/O Servers
	+ FORCE_I_ALIGN added
	+ reorganized Server structure slightly (only I/O Servers
	  handle individual frame files on disk)
	+ add option to allow exact division of frames per processor
	  (PARALLEL_PERFECT)

= SPEED IMPROVEMENTS
	+ don't start Input server if not needed

= MAINTENANCE
	+ got rid of niceProcesses line in main.c
	+ changed write() to SafeWrite() in parallel.c
	+ commented stuff out after #endif's
	+ fixed prototype warnings (eliminated non-4-byte args)


1.1 Release	August 1993

Changes from 1.0 to 1.1
-----------------------
= BUG FIXES
	+ fixed bug in parallel Server code which didn't htonl() frame
	  numbers correctly (so it didn't work on little-endian machines)
	+ fixed bug -- B-frames were always getting just 1 slice
	+ fixed listen() to use max connections allowed
	+ fixed noparallel.c so it doesn't complain during non-parallel
	  execution

= NEW FEATURES
	+ added level-2 p-search (exhaustive full, then half)
	+ now prints signal-to-noise ratio
	+ parallel code complains if absolute path not used for parameter
	  file
	+ changed single I/O server into separate Input and Output Servers
	  (and have Output Server combine frames in parallel)

= SPEED IMPROVEMENTS
	+ slight improvement in Mpost_QuantZigBlock (.10 ms/call down to .08 ms
	  on Sparc-10)
	+ improvement in speed of BlockifyFrame (45.8 ms/call down to 21.2 ms)
	+ improvement in ComputeMotionBlock (0.02 ms/call down to 0.01 ms)
	+ improvement in ComputeMotionLumBlock (0.04 ms/call down to 0.02 ms)
	+ improvement in LumAddMotionError (0.06 ms/call down to 0.05 ms)
		(changed /2 to >>1)
	
= MAINTENANCE
	+ removed most memory.h references (except jrevdct)
	+ added CFLAGS lines in Makefile for SVR4.0 and SGI machines
	+ removed mproto.h
	+ got rid of printing connection times


1.0 Release	July 1993