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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.
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* based on video_out_null.c from mpeg2dec
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*
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* Copyright (C) Aaron Holtzman - June 2000
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "config.h"
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#include "core/mp_msg.h"
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#include "vo.h"
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#include "video/vfcap.h"
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#include "video/mp_image.h"
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static void draw_image(struct vo *vo, mp_image_t *mpi)
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{
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}
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static void draw_osd(struct vo *vo, struct osd_state *osd)
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{
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}
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static void flip_page(struct vo *vo)
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{
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}
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static int query_format(struct vo *vo, uint32_t format)
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{
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if (IMGFMT_IS_HWACCEL(format))
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return 0;
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return VFCAP_CSP_SUPPORTED;
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}
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static int config(struct vo *vo, uint32_t width, uint32_t height,
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uint32_t d_width, uint32_t d_height, uint32_t flags,
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uint32_t format)
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{
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return 0;
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}
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static void uninit(struct vo *vo)
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{
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}
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static void check_events(struct vo *vo)
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{
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}
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static int preinit(struct vo *vo, const char *arg)
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{
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if (arg) {
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mp_tmsg(MSGT_VO, MSGL_WARN, "[VO_NULL] Unknown subdevice: %s.\n", arg);
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return ENOSYS;
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}
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return 0;
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}
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static int control(struct vo *vo, uint32_t request, void *data)
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{
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return VO_NOTIMPL;
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}
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const struct vo_driver video_out_null = {
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.info = &(const vo_info_t) {
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"Null video output",
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"null",
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"Aaron Holtzman <aholtzma@ess.engr.uvic.ca>",
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""
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},
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.preinit = preinit,
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.query_format = query_format,
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.config = config,
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.control = control,
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.draw_image = draw_image,
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.draw_osd = draw_osd,
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.flip_page = flip_page,
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.check_events = check_events,
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.uninit = uninit,
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};
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