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Slices allowed filtering or drawing video in horizontal bands or blocks. This allowed working on the video in smaller units. In theory, this could bring a performance win by lowering cache pressure, as you didn't have to keep the whole video frame in cache while filtering, only the slice. In practice, the slice code path was barely used for the following reasons: - Multithreaded decoding with ffmpeg didn't use slices. The ffmpeg slice callback was disabled, because it can be called from another thread, and the mplayer video chain is not thread-safe. - There was nothing that would turn "full" images into appropriate slices, so slices were rarely used. - Most filters didn't actually support slices. On the other hand, supporting slices lead to code duplication and more complex code in general. I made some experiments and didn't find any actual measurable performance improvements when using slices. Even ffmpeg removed slices based filtering from libavfilter in favor of simpler code. The most broken thing about the slices code path is that slices can't be queued, like it is done for images in vo.c.
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/* VFCAP_* values: they are flags, returned by query_format():
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPLAYER_VFCAP_H
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#define MPLAYER_VFCAP_H
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// set, if the given colorspace is supported (with or without conversion)
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#define VFCAP_CSP_SUPPORTED 0x1
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// set, if the given colorspace is supported _without_ conversion
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#define VFCAP_CSP_SUPPORTED_BY_HW 0x2
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// set if the driver/filter can draw OSD
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#define VFCAP_OSD 0x4
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// driver/filter can do vertical flip (upside-down)
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#define VFCAP_FLIP 0x80
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// driver/hardware handles timing (blocking)
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#define VFCAP_TIMER 0x100
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// vf filter: accepts stride (put_image)
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// vo driver: has draw_slice() support for the given csp
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#define VFCAP_ACCEPT_STRIDE 0x400
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// filter does postprocessing (so you shouldn't scale/filter image before it)
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#define VFCAP_POSTPROC 0x800
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#endif /* MPLAYER_VFCAP_H */
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