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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6021 b3059339-0415-0410-9bf9-f77b7e298cf2
122 lines
4.7 KiB
Plaintext
122 lines
4.7 KiB
Plaintext
VideoOutPlugins - Video Filters
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===============
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video filters are plugin-like code modules implementing the interface
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defined in vf.h
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basically it means video output manipulation, ie. these plugins can
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modify the image and the image properties (size, colorspace etc) between
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the video decoders (vd.h) and output layer (libvo or video encoders)
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the actual API is a mixture of the video decoder (vd.h) and libvo
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(video_out.h) APIs.
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the main differences:
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- vf plugins may be "loaded" multiple times, with different parameters
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and context - it's new in mplayer, old APIs weren't reentrant
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- vf plugins don't have to implement all functions - all funcs has
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'fallback' version, so the plugins only override these if want
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- each vf plugin has its own get_image context, and they can interchange
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images/buffers using these get_image/put_image calls.
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API details:
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-- TO DO -- (see vf.h fpr API and vf_*.c for examples)
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Current plugins:
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================
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-vop crop[=w:h:x:y]
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Simple cropping plugin.
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w,h (cropped width,height) defaults to original width,height
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x,y (position of cropped subimage on the original image) defaults to center
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MPI: EXPORT only, using stride manipulation
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-vop expand[=w:h:x:y:o]
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Expanding _and_ (optional) OSD rendering plugin.
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w,h (expanded width,height) defaults (-1) to original width,height
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x,y (position of original image on the expanded image) defaults (-1) to center
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o (0=disable/1=enable SUB/OSD rendering) defaults (0) to disabled
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MPI: DR (if possible) or copy
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Special: mpcodecs core uses it to solve stride restrictions between filters
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mencoder uses (autoload) it to render SUB/OSD
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-vop flip
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Flips image upside-down (vertical mirroring)
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No parameters.
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MPI: DR (if possible) or EXPORT, using stride manipulation
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Special: dec_video autoloads it when flipping is required and libvo can't do
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-vop mirror
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Horizontal mirroring
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No parameters.
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MPI: TEMP
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-vop rotate[=x]
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Rotate image +/- 90 degrees
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Optional 'x' parameter (0..3) controls horizontal and vertical mirroring
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MPI: TEMP
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-vop scale[=w:h]
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Software scaling (zoom) _and_ yuv<->rgb colorspace conversion
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w,h (new width/height after scaling) defaults to original width,height
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note: if -zoom is used, and underlaying filters (including libvo)
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uncapable of scaling, then it defaults to d_width/d_height !
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note 2: w/h values -1 means original width/height, 0 means scaled
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d_width/d_height
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MPI: TEMP, accepts stride
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Special: dec_video and mpcodecs core autoloads it for colorspace conv.
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-vop yuy2
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Forced software YV12/I420 -> YUY2 conversion
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(usefull for video cards/drivers with slow YV12 but fast YUY2 support)
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MPI: TEMP, accepts stride
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-vop rgb2bgr[=swap]
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RGB 24/32 <-> BGR 24/32 colorspace conversion (default) or
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RGB 24/32 <-> RGB 24/32 conversion with R<->B swapping ('swap' option)
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MPI: TEMP, accepts stride
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-vop palette
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RGB/BGR 8 -> RGB/BGR 15/16/24/32 colorspace conversion using palette
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MPI: TEMP, accepts stride
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-vop format[=fourcc]
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_restrict_ the list of supported colorspaces (query-format()) to a single,
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given fourcc. The 'fourcc' option defaults to 'yuy2', but may be any
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format name, like rgb15, bgr24, yv12 etc...
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note again, it does NOT do any conversion, it just limits the _next_
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plugins format list.
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MPI: passthru
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-vop pp[=flags]
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Postprocessing filter. (usefull for codecs without built-in
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postprocessing, like libmpeg12 or libavcodec)
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Flags is a bitmask set of enabled filters (see manpage for -pp details),
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defaults to the value of divx_quality (set by -pp commandline option)
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MPI: DR (if possible) or TEMP
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Special: dec_video autoloads it if -pp option used but codec can't do pp.
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-vop lavc[=quality:fps]
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Fast software YV12->MPEG1 conversion, usefull for dxr3/dvb drivers
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It uses libavcodec. Currently faster and better quality than -vop fame!
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Param quality: fixed qscale (1<=quality<32) or bitrate (32<=quality KBits)
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Param fps: force output fps (float value). If not give, or 0, it's
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autodetected based on height (240,480->29.97fps, others -> 25fps)
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MPI: EXPORT special
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-vop fame
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Fast software YV12->MPEG1 conversion, usefull for dxr3/dvb drivers
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It uses libfame.
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MPI: EXPORT special
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-vop dvbscale[=aspect]
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Setup scaling to the optimal values for the DVB card.
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(use HW for X-scaling, calc sw Y scaling to keep aspect)
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The 'aspect' parameter controls aspect ratio, it should be calculated
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as aspect=DVB_HEIGHT*ASPECTRATIO, default is 576*(4/3)=768
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(for 16:9 TV set it to 576*(16/9)=1024)
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It's only usefull togethwer with expand+scale:
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-vop lavc,expand=-1:576:-1:-1:1,scale=-1:0,dvbscale
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MPI: passthru
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